阅读说明：本技术 一种薄壁助推挤压管的生产工艺及其薄壁助推挤压管 (Production process of thin-wall boosting extrusion pipe and thin-wall boosting extrusion pipe ) 是由 杜亚玲 刘玲 于 2020-09-01 设计创作，主要内容包括：本发明涉及一种薄壁助推挤压管的生产工艺及其薄壁助推挤压管,属于食品加工设备技术领域,经过选取优质管材并对其进行切管后,通过水胀工艺胀形出具有助推槽的管坯,然后再拉拔出用于焊接进料管的一体结构的环形管,最后进行机加工处理以及修整,制得薄壁助推挤压管,相比于传统金属浇铸工艺,由本生产工艺制得的薄壁助推挤压管,管壁厚度大大减小,重量轻,生产工艺耗能低,生产成本低,工艺步骤简单,且降低了生产周期,提高了生产效率,可实现连续化生产。(The invention relates to a production process of a thin-wall boosting extruded tube and the thin-wall boosting extruded tube, belonging to the technical field of food processing equipment.)

1. The production process of the thin-wall boosting extruded pipe is characterized by comprising the following steps of:

putting the tube blank into a cavity of an expanding machine, wherein the cavity is provided with a convex strip for forming a boosting groove of a thin-wall boosting extruded tube;

placing a high-pressure punch of the bulging machine into the tube blank, and sealing the tube blank;

starting the bulging machine, injecting a high-pressure medium into the inner cavity of the tube blank by the high-pressure punch, deforming and expanding the tube blank under the high-pressure expansion action of the high-pressure medium, attaching the outer wall of the tube blank to the inner wall of the cavity, and forming the boosting groove by a gap between every two adjacent convex walls, wherein the deformed and expanded tube blank is provided with the convex walls protruding towards the inner cavity of the tube blank under the jacking action of the convex strips;

and machining the tube blank after the bulging is finished, and checking and accepting to obtain the thin-wall boosting extruded tube.

2. A process for producing a thin-walled push-assisted extruded tube according to claim 1, wherein before machining the tube blank after completion of the water expansion, the process further comprises the steps of:

determining the position of a feed inlet for feeding food on the tube wall of the tube blank;

a drawing opening for penetrating through a drawing rod of the drawing machine is formed in the position of the feed opening;

putting the tube blank with the drawing opening into a forming die of the drawing machine, fixing the tube blank, and putting a drawing head of the drawing machine into an inner cavity of the tube blank;

inserting the drawing rod into the inner cavity of the tube blank through the drawing opening, and fixedly connecting the drawing rod and the drawing head;

the drawing machine is started, the drawing machine pulls the drawing rod, the drawing rod drives the drawing head to pass through the drawing opening so as to expand the drawing opening, and the pipe wall at the periphery of the drawing opening is stretched and expanded by the drawing head and then is deformed and protruded outside the pipe blank to form an annular pipe for fixedly connecting an external feeding pipe.

3. The production process of the thin-wall boosting extruded tube according to claim 2, wherein in the process that the drawing rod drives the drawing head to expand the drawing opening, the expansion displacement line of the drawing head is staggered with the central axis of the tube blank.

4. A process for producing a thin-walled push-assist extruded tube according to claim 2, wherein before the machining process after the drawing of the annular tube from the tube blank, the process further comprises the steps of:

eccentric straightening: and adopting a correcting rod matched with the inner diameter of the tube cavity of the annular tube, inserting the correcting rod into the annular tube so as to rotate around the circumferential direction of the tube blank, and driving the whole tube wall of the annular tube to deflect by the correcting rod so that the central axis of the annular tube is staggered with the central axis of the tube blank.

5. The production process of the thin-wall boosting extruded tube according to the claim 2 or 3, characterized in that the drawing machine is provided with a core rod with the shape matched with the inner cavity of the tube blank, the core rod is provided with a drawing cavity, the central axis of the drawing cavity is staggered with the central axis of the core rod, and the drawing head is connected with the drawing cavity in a sliding way; after the tube blank is fixed, the method further comprises the following steps:

putting the drawing head into the drawing cavity, and putting the core rod into the inner cavity of the tube blank;

and the top opening of the drawing cavity corresponds to the drawing opening of the tube blank, the drawing rod is inserted into the inner cavity of the tube blank, and then the drawing rod and the drawing head are fixedly connected.

6. The production process of the thin-wall boosting extruded tube according to claim 2, wherein a placing cavity matched with the shape and the size of a cavity of the expanding machine is formed in a forming die of the drawing machine, and the tube blank is fixed in the placing cavity.

7. The production process of the thin-wall boosting extruded pipe according to claim 1, wherein the bulging machine is a water bulging machine, the water bulging machine comprises an upper die, a lower die and the high-pressure punch for outputting a high-pressure water source, the upper die and the lower die are arranged in a matched manner, an upper cavity is arranged on the upper die, a lower cavity is arranged at a corresponding position of the lower die, the upper cavity and the lower cavity are matched to form the cavity, and the raised strips are arranged on the cavity wall of the upper cavity and the cavity wall of the lower cavity.

8. The thin-walled boost extruded tube production process according to claim 5, wherein the drawing head of the drawing machine is hemispherical, and the radius of the drawing head is equal to the inner cavity radius of the feeding tube of the target thin-walled boost extruded tube.

9. The thin-walled push-assisted extruded tube production process according to claim 2, further comprising the steps of, after the annular tube is drawn from the tube blank:

trimming the annular tube: cutting off redundant materials on the top of the annular tube after drawing, and leveling the top of the annular tube;

welding a feeding pipe: selecting a circular pipe with the same caliber as the annular pipe as a feeding pipe, and fixedly connecting the circular pipe with the top of the annular pipe;

sealing the tail end: taking the end part of the tube blank close to the annular tube as the tail end of the tube blank, selecting a sealing plate matched with the caliber of the tail end of the tube blank, and welding the sealing plate on the tail end of the tube blank;

and finishing the roundness of the whole tube blank and removing burrs of the whole tube blank.

10. A process for the production of a thin-walled push-assisted extruded tube according to claim 2 or 9, further comprising the steps of:

machining an auxiliary part: taking the end part of the tube blank, which is far away from one end of the annular tube, as a discharge end, selecting a sleeve with the inner diameter equal to the outer diameter of the tube wall at the discharge end of the tube blank as an auxiliary mounting ring for mounting and connecting an external discharge part, and rolling or turning teeth on the outer wall of the auxiliary mounting ring;

installing an auxiliary part: and fixedly sleeving the auxiliary mounting ring after the rolling or threading is finished on the discharge end of the tube blank.

11. The thin-wall boosting extrusion pipe manufactured according to the production process of any one of claims 1 to 10, wherein a plurality of convex walls formed by protruding the pipe wall of the thin-wall boosting extrusion pipe towards the inner cavity direction of the thin-wall boosting extrusion pipe are arranged on the inner wall of the thin-wall boosting extrusion pipe, and gaps between the convex walls form the boosting grooves.

12. The thin-walled push-assisted extruded tube of claim 11 having a tube wall thickness of 0.6mm to 2.8 mm.

13. The thin-walled extruded booster tube of claim 11 wherein the thin-walled extruded booster tube is formed of brass, copper or stainless steel.

14. The thin-walled push-assisted extruded tube of claim 11 wherein the outer wall of the thin-walled push-assisted extruded tube is provided with an annular tube integrally formed with the side wall of the thin-walled push-assisted extruded tube.

15. The thin-walled extrusion-assisted pipe according to claim 14, wherein the pipe wall of the thin-walled extrusion-assisted pipe is provided with an annular discharge pipe which is formed integrally after the secondary drawing.

16. A thin-walled push-assist extrusion tube as claimed in any one of claims 11 to 14 wherein the thin-walled push-assist extrusion tube is used in meat grinders, grinders and household noodle makers.

17. The thin-walled push-assist extrusion tube of claim 15 wherein the thin-walled push-assist extrusion tube is used in a juicer.

Technical Field

The invention relates to the technical field of food extrusion and stranding processing, in particular to a production process of a thin-wall boosting extrusion pipe and the thin-wall boosting extrusion pipe.

Background

As shown in fig. 1, the push-aid extrusion tube 1 ' is mainly applied to food processing equipment such as meat grinder, juice extractor, grinder and household noodle maker, and is mainly used in cooperation with a spiral extrusion rod 3 ' of the food processing equipment, the spiral extrusion rod 3 ' runs in the push-aid extrusion tube, materials such as meat, fruit, beans and dough enter between the spiral extrusion rod 3 ' and the inner wall of the push-aid extrusion tube 1 ', and are pushed forward while being extruded by the running spiral extrusion rod 3 ', and finally pushed out at the tail end of the push-aid extrusion tube 1 ', so as to prepare meat paste, fruit juice, bean grinding powder, noodles and the like.

In order to better improve the stranding processing effect and enable the stranded food to rapidly come out from the discharging end to complete the discharging process, the inner wall of the boosting extrusion pipe 1 ' is correspondingly provided with boosting grooves 2 ', generally, the boosting grooves 2 ' are spiral shapes to adapt to spiral pushing pieces 4 ' on a spiral extrusion rod 3 ', and the boosting grooves 2 ' are located on the inner wall of the boosting extrusion pipe 1 ' and are spiral shapes, so that the twisted food is difficult to machine in the manufacturing process and can only be manufactured by the traditional metal casting process.

The boosting extruded tube prepared by the traditional metal casting process has the advantages that the metal casting energy consumption is very large, the tube wall thickness of the boosting extruded tube prepared by the traditional metal casting process is at least more than 3.0mm, the tube wall thickness is large, the weight is large, the production period is long, the yield is low, and the production cost is high.

Disclosure of Invention

The invention provides a production process of a thin-wall boosting extrusion pipe, aiming at solving the technical problems that the traditional boosting extrusion pipe can only be manufactured through a traditional metal pouring process, so that the produced boosting extrusion pipe is large in pipe wall thickness and weight and high in production cost.

In order to solve the above problems, the present invention provides the following technical solutions:

a production process of a thin-wall boosting extruded tube comprises the following steps:

step 1, selecting materials: selecting a high-quality food-grade pipe, and checking and accepting the quality of the pipe, wherein on the quality check and acceptance of the pipe, according to the production process requirements of specific products, the pipe is comprehensively checked in the aspects of material, roundness, caliber size, pipe wall thickness, straightness, whether cracks exist or not, so that the qualified pipe is checked and accepted, the product quality is ensured, further, the pipe blank is made of brass, red copper or stainless steel, the pipe wall thickness of the pipe is 0.6mm-2.8mm, the brass, red copper and stainless steel have good ductility, and after bulging, the metal properties of the brass, red copper and stainless steel, such as strength, toughness and the like, can be greatly improved, and the stainless steel also has the function of resisting oxidation and corrosion; when the thickness of the pipe wall of the pipe is less than 0.6mm, the pipe wall of the manufactured thin-wall boosting extrusion pipe is easy to deform under stress when in use, the strength is not enough, the strength of the pipe wall is higher than that of the pipe wall of 2.8mm, although the strength of the pipe wall is enough, the material consumption is more, and the pipe with the too thick pipe wall is difficult to bulge;

step 2, cutting the pipe: cutting the pipe selected in the step 1 into a pipe blank with a certain length according to the actual length and the technological requirements of the target thin-wall boosting extruded pipe, preferably, the length of the pipe blank is 50-170 mm, if the length of the pipe blank is too low, the processing distance of food in the pipe during stranding is shortened, the problem that food cannot be stranded well is easy to occur, the product quality is influenced, and if the pipe blank is too long, the pipe blank wastes the pipe;

step 3, expanding and boosting the grooves: putting the tube blank prepared in the step 2 into a cavity of a bulging machine, wherein the cavity is provided with a plurality of raised lines for forming boosting grooves of a thin-wall boosting extruded tube, and the raised lines are distributed in a complex line shape or a spiral shape in the cavity; then placing a high-pressure punch of the bulging machine into the tube blank, and sealing the tube blank; then starting the bulging machine, injecting a high-pressure medium into the inner cavity of the tube blank by the high-pressure punch, deforming and expanding the tube blank under the high-pressure expansion action of the high-pressure medium, attaching the outer wall of the tube blank to the inner wall of the cavity, and forming the boosting groove by a gap between the adjacent convex walls, wherein the deformed and expanded tube blank is provided with convex walls protruding towards the inner cavity of the tube blank under the propping action of the convex strip;

step 4, drawing the annular tube: after the tube blank is subjected to bulging operation, determining the position of a feed inlet for feeding food on the tube wall of the tube blank;

a drawing opening for penetrating through a drawing rod of the drawing machine is formed in the position of the feed opening;

putting the tube blank with the drawing opening into a forming die of the drawing machine, fixing the tube blank, and putting a drawing head of the drawing machine into an inner cavity of the tube blank;

inserting the drawing rod into the inner cavity of the tube blank through the drawing opening, and fixedly connecting the drawing rod and the drawing head;

starting the drawing machine, wherein the drawing machine pulls the drawing rod, the drawing rod drives the drawing head to pass through the drawing opening so as to expand the drawing opening, and the pipe wall at the periphery of the drawing opening deforms and protrudes outside the pipe blank after being drawn and expanded by the drawing head so as to form an annular pipe for fixedly connecting an external feeding pipe; the annular pipe for connecting the external feeding pipe is directly arranged on the pipe blank in a drawing mode, the purpose of fixedly connecting the feeding pipe can be realized only by adopting a circular pipe welding process subsequently, and the design difficulty and the welding difficulty of the product are greatly reduced.

Step 5, machining and finishing a finished product: machining the tube blank after the drawing is finished, cutting redundant materials at the top of the ring-shaped tube after the drawing is finished, leveling the top of the ring-shaped tube, correcting the roundness of the whole tube blank, removing burrs of the whole tube blank, and performing nondestructive testing to obtain the thin-wall boosting extruded tube.

Furthermore, in the process that the drawing rod drives the drawing head to expand the drawing opening, the expansion displacement line of the drawing head is staggered with the central axis of the tube blank, namely the movement displacement line of the drawing head during drawing is staggered with the central axis of the tube blank, because the central axis of an annular tube cavity channel formed after the drawing head expands the tube blank is the movement displacement line of the drawing head during drawing, the central axis of the formed feeding pipe is staggered with the central axis of the tube blank, and because the spiral extrusion rod is rotatably arranged on the thin-wall boosting extrusion pipe along the central axis of the thin-wall boosting extrusion pipe, the feeding opening of the feeding pipe can be positioned above one side of the spiral extrusion rod instead of directly above the spiral extrusion rod, the feeding opening of the feeding pipe is arranged in an eccentric mode, namely the feeding falling direction of the feeding pipe is one side of the spiral extrusion rod, when meat food is fed, the meat food can directly fall to one side of the spiral extrusion rod instead of the spiral extrusion rod, so that the spiral pushing piece can directly push the food when acting, and the purpose of improving the pushing efficiency is further achieved.

Furthermore, the drawing machine is provided with a core rod of which the shape is matched with that of the inner cavity of the tube blank, a drawing cavity is arranged on the core rod, the central axis of the drawing cavity is staggered with that of the core rod, and the drawing head is connected with the drawing cavity in a sliding manner; after the tube blank is fixed, the method further comprises the following steps:

putting the drawing head into the drawing cavity, and putting the core rod into the inner cavity of the tube blank;

and the top opening of the drawing cavity corresponds to the drawing opening of the tube blank, the drawing rod is inserted into the inner cavity of the tube blank, and then the drawing rod and the drawing head are fixedly connected.

Through the design of the mode of drawing the core rod and the drawing cavity with the central axis staggered with the core rod is formed in the core rod, so that the purpose that the motion displacement line of the drawing head is staggered with the central axis of the tube blank can be realized during drawing, and the manufactured feeding tube of the thin-wall boosting extruded tube has an eccentric structure, and the stranding processing efficiency is improved.

In addition, in order to achieve the purpose of designing the feeding pipe into an eccentric structure, besides the eccentric structure scheme of the mandrel and the drawing cavity, the technical scheme of eccentric pipe straightening can also be adopted, and specifically, before machining treatment after the annular pipe is drawn on the tube blank, the method further comprises the following steps:

eccentric straightening: and adopting a correcting rod matched with the inner diameter of the tube cavity of the annular tube, inserting the correcting rod into the annular tube so as to rotate around the circumferential direction of the tube blank, and driving the whole tube wall of the annular tube to deflect by the correcting rod so that the central axis of the annular tube is staggered with the central axis of the tube blank.

Further, the bulging machine is a water bulging machine, the water bulging machine comprises an upper die, a lower die and a high-pressure punch for outputting a high-pressure water source, the high-pressure medium is high-pressure water, the upper die and the lower die are matched and arranged, an upper cavity is arranged on the upper die, a lower cavity is arranged at the corresponding position of the lower die, the upper cavity and the lower cavity are matched and formed in the cavity, and the raised strips are arranged on the cavity wall of the upper cavity and the cavity wall of the lower cavity.

Furthermore, a placing cavity matched with the appearance of the target thin-wall boosting extruded tube is formed in a shape die of the drawing machine.

Furthermore, the drawing head of the drawing machine is hemispherical, and the radius of the drawing head is matched with the radius of the inner cavity of the feeding pipe of the target thin-wall boosting extrusion pipe.

Further, after flattening the top of the annular tube in the step 5 and before correcting the roundness of the whole tube blank, the method also comprises the following steps:

welding a feeding pipe: selecting a circular pipe with the same caliber as the annular pipe as a feeding pipe, and welding and fixing the circular pipe on the top of the annular pipe;

sealing the tail end: and taking the end part of the tube blank close to the annular tube as the tail end of the tube blank, selecting a sealing plate matched with the caliber of the tail end of the tube blank, and welding and fixing the sealing plate on the tail end of the tube blank.

Further, the step 5 further comprises the following steps:

machining an auxiliary part: taking the end part of the tube blank, which is far away from one end of the annular tube, as a discharge end, selecting a sleeve with the inner diameter matched with the outer diameter of the tube wall at the discharge end of the tube blank as an auxiliary mounting ring for mounting and connecting an external discharge part, and rolling or threading the outer wall of the auxiliary mounting ring;

installing an auxiliary part: and fixedly sleeving the auxiliary mounting ring after the rolling or threading is finished on the discharge end of the tube blank.

The invention also provides a thin-wall boosting extrusion pipe prepared by the production process, the thickness of the pipe wall of the thin-wall boosting extrusion pipe is 0.6-2.8 mm, a plurality of convex walls formed by the protrusion of the pipe wall of the thin-wall boosting extrusion pipe towards the direction of the inner cavity of the thin-wall boosting extrusion pipe are arranged on the inner wall of the thin-wall boosting extrusion pipe, and gaps among the convex walls form the boosting grooves.

Furthermore, the thin-wall boosting extrusion pipe is made of brass, red copper or stainless steel.

Furthermore, an annular pipe which is integrally formed with the side wall of the thin-wall boosting extrusion pipe is arranged on the outer wall of the thin-wall boosting extrusion pipe.

Further, the central axis of the annular pipe is staggered with the central axis of the thin-wall boosting extrusion pipe.

Compared with the traditional metal casting process, the thin-wall boosting extruded tube prepared by the production process has the advantages that the thickness of the tube wall is greatly reduced, the thickness of the tube wall can be directly reduced to be below the thickness of the tube wall which can not be achieved by the traditional metal casting process in the actual production, the production cost is greatly reduced, the production process combining the water expansion process and the drawing process is adopted, the corresponding production equipment is simpler, the production period is short, the production efficiency is greatly improved, the continuous production can be completely realized, the structural strength of the tube blank after bulging is improved, the metal performance is enhanced, and the application performance is very excellent, the integrated annular pipe formed by the drawing process greatly reduces the welding difficulty of the feeding pipe, ensures the sealing property of a welding line and can keep the yield of products at a high level.

The invention also provides a meat grinder which is provided with the thin-wall boosting extrusion pipe manufactured by applying the production process.

The invention also provides a grinding machine which is provided with the thin-wall boosting extrusion pipe manufactured by applying the production process.

The invention also provides a household noodle maker, which is provided with the thin-wall boosting extrusion pipe manufactured by applying the production process.

The invention also provides a juicer which is provided with the thin-wall boosting extrusion pipe manufactured by applying the production process, and further, the thin-wall boosting extrusion pipe of the juicer is provided with an annular discharge pipe which is integrally formed after secondary drawing, wherein the secondary drawing process step can adopt the step 4 in the production process, and in the specific operation, the caliber of a drawing head only needs to be reduced to be consistent with the inner diameter of a target discharge pipe, so that redundant description is omitted.

Compared with the prior art, the invention has the beneficial effects that: compared with the traditional metal casting process, the thin-wall boosting extrusion pipe prepared by the production process has small pipe wall thickness, the pipe wall thickness can be directly reduced to be below the pipe wall thickness which can not be achieved by the traditional metal casting process in the practical production, the production cost is greatly reduced, the production process combining the water swelling process and the drawing process is adopted, the corresponding production equipment is simpler, the production period is short, the production efficiency is improved, the continuous production can be completely realized, the structural strength is improved and the metal performance is enhanced by the bloated pipe blank, the thin-wall boosting extrusion pipe can be directly applied to food processing equipment such as meat mincer, juicer, grinder and household noodle maker, the application performance is very excellent, the integrated annular pipe formed by the drawing process greatly reduces the welding difficulty of a feeding pipe, and ensures the sealing performance and the structural integrity of a welding seam, the yield of the product can be kept at a high level.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a prior art push-assisted extrusion tube and screw extrusion stem;

FIG. 2 is a schematic structural view of a thin-walled push-assisted extruded tube made by the process of the present invention;

FIG. 3 is a schematic view of the structure of FIG. 2 from another perspective;

FIG. 4 is a schematic structural view after a drawing opening is formed in the tube blank;

FIG. 5 is a schematic structural view of an upper die and a lower die of the water expander of the present invention;

FIG. 6 is a schematic view of the structure of the mandrel of the drawing machine according to the present invention;

FIG. 7 is a schematic view of the eccentric correction of the ring tube using the correction rod;

FIG. 8 is a schematic structural view of a thin-walled boost extruded tube made by the present process applied to a meat grinder;

FIG. 9 is a schematic diagram of the exploded structure of FIG. 8;

FIG. 10 is a schematic view of the construction of a thin-walled push-assisted extrusion tube made by the present process applied to a juicer;

the attached drawings are as follows: 1', boosting and extruding the pipe; 2', a boosting groove; 3', a screw extrusion rod; 4', spirally pushing the sheet; 1. thin-wall boosting extrusion pipes; 2. a boosting groove; 3. a convex strip; 4. a high pressure punch; 5. a raised wall; 6. an upper die; 7. a lower die; 8. a draw bar; 81. a drawing opening; 9. drawing the head; 10. an annular tube; 11. a feed pipe; 12. a core rod; 13. a drawing cavity; 14. closing the plate; 15. a straightening bar; 16. an end cap; 17. an auxiliary mounting ring; 18. and (4) discharging the pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 2 to 6, a process for producing a thin-walled push-assisted extruded tube comprises the following steps:

step 1, selecting materials: selecting a high-quality pipe, checking the quality of the pipe, preferably, checking the quality of the pipe according to the production process requirement of a specific product in the aspects of the material, roundness, caliber size, pipe wall thickness, straightness, crack and the like of the pipe according to the quality check of the pipe, so as to check and accept the qualified pipe and ensure the product quality, wherein the pipe blank is made of brass, red copper or stainless steel, the pipe wall thickness of the pipe is 0.6-2.8 mm, the brass, red copper and stainless steel have good ductility, the metal properties such as strength and toughness of the brass, red copper and stainless steel can be greatly improved after bulging, and the stainless steel also has the function of oxidation and corrosion resistance; the thickness of the pipe wall of the pipe is 0.6mm-2.8mm, the pipe wall is less than 0.6mm, the pipe wall of the prepared thin-wall boosting extrusion pipe is easy to deform under stress when in use, the strength is not enough, the strength is higher than that of the pipe wall of the pipe with the thickness of 2.8mm, although the strength of the pipe wall is enough, the material consumption is more, and the pipe with the thick pipe wall is difficult to bulge; preferably, in the embodiment, the thickness of the tube wall of the tube blank is 0.8mm-1.5mm, and the tube wall strength of the thin-wall boosting extrusion tube with the tube wall thickness in the range of 0.8mm-1.5mm is most suitable.

Step 2, cutting the pipe: cutting the pipe selected in the step 1 into a pipe blank with a certain length according to the actual length and the technological requirements of the target thin-wall boosting extruded pipe, preferably, the length of the pipe blank is 50-170 mm, if the length of the pipe blank is too low, the processing distance of food in the pipe during stranding is shortened, the problem that food cannot be stranded well is easy to occur, the product quality is influenced, and if the pipe blank is too long, the pipe blank wastes the pipe;

step 3, expanding and boosting the grooves: referring to fig. 5, the tube blank obtained in the step 2 is placed into a cavity of an expanding machine, wherein the cavity is provided with a plurality of convex strips 3 for forming a boosting groove 2 of a thin-wall boosting extruded tube, and the convex strips 3 are distributed in a complex line shape or a spiral shape in the cavity; then, putting a high-pressure punch 4 of an expanding machine into the tube blank, and sealing the tube blank; then starting an expanding machine, injecting a high-pressure medium into the inner cavity of the tube blank by a high-pressure punch 4, deforming and expanding the tube blank under the high-pressure expansion action of the high-pressure medium, attaching the outer wall of the tube blank to the inner wall of the cavity, under the jacking action of a convex strip 3, enabling the tube blank after deformation and expansion to have convex walls 5 protruding towards the inner cavity of the tube blank, and enabling a gap between every two adjacent convex walls 5 to form a boosting groove 2, wherein in the embodiment, referring to fig. 5, the expanding machine is preferably a water expanding machine which comprises an upper die 6, a lower die 7 and the high-pressure punch 4 outputting the high-pressure medium, wherein the high-pressure medium is high-pressure water, the upper die 6 and the lower die 7 are arranged in a matched manner, an upper cavity is arranged on the upper die 6, a lower cavity is arranged at the corresponding position of the lower die 7, and the upper cavity and the lower cavity are matched to form the cavity for water expanding the tube blank after the upper die and the lower die are matched and connected, wherein, the inner wall of the cavity is provided with a spiral or riffled convex strip 3, namely, the inner walls of the upper cavity and the lower cavity are provided with spiral or riffled convex strips 3, during the water expansion process, the tube blank deforms and expands, the outer wall of the tube blank can be attached to the inner wall of the cavity, because the convex strips 3 are arranged in the cavity, under the propping action of the convex strips 3, the expanded tube blank is provided with convex walls 5 protruding towards the inner cavity of the tube blank, a boosting groove 2 for pushing food to move forwards is formed by a gap between every two adjacent convex walls 5, when the water expansion operation is carried out on the tube blank, the tube blank is firstly put into the lower cavity, then an upper die 6 is put down to be matched with a lower die 7, the tube blank can be positioned in the cavity, then a high-pressure punch of a water expansion machine is put into the tube blank, then the upper die 6 and the lower die 7 are sealed, the water expansion machine is started, the high-pressure water can be sprayed by the high-pressure punch, the tube blank is deformed and expanded, and the tube blank is limited in the space of the cavity, so that the tube blank can be expanded to form the shape the same as the shape of the inner wall of the cavity, and the bulging process of the tube blank is completed.

Step 4, drawing the annular tube: determining and marking the feed inlet position of the tube blank manufactured in the step 3 according to a production process diagram, referring to fig. 4, and forming a drawing opening 81 for penetrating through a plate pulling rod 8 of a drawing machine in the middle of the feed inlet position of the tube blank, wherein the forming manner can be drilling, then placing the tube blank with the drawing opening 81 into a forming die of the drawing machine and fixing, referring to fig. 4 and fig. 6, a placing cavity (not shown in the drawing) which is consistent with the shape of the target thin-wall boosting extrusion tube is arranged in the forming die of the drawing machine, the tube blank is installed and fixed in the placing cavity, then a drawing head 9 is arranged in the inner cavity of the tube blank, wherein the drawing head 9 is preferably hemispherical, the radius of the drawing head 9 is matched with the radius of the inner cavity of the feed pipe 11 of the target thin-wall boosting extrusion tube, preferably, the radius of the drawing head 9 is equal to the radius of the inner cavity of the feed pipe 11 of the target thin-wall boosting extrusion tube 1, then the drawing rod 8 is inserted into the tube blank from the drawing opening 81, the drawing rod 8 and the drawing head 9 are fixedly connected in a threaded connection, namely, the top of the drawing head 9 is provided with a threaded hole which is matched with the bottom of the drawing rod 8 through threads, when the drawing head is fixedly connected, only the drawing head 9 needs to be screwed at the bottom of the drawing rod 8, then the drawing machine is started, the drawing rod 8 is lifted, the drawing rod 8 drives the drawing head 9 to lift, under the action of the upward drawing force of the drawing head 9, the aperture of the drawing opening 81 in the tube blank is continuously enlarged, the tube wall around the drawing opening 81 is also taken out upwards by the drawing head, when the aperture of the drawing port 81 is enlarged to be equal to the outer diameter of the drawing head 9, the drawing head is separated from the blank tube, the drawing is completed, and at the same time, the pipe wall around the drawing opening 81 is deformed and protruded upwards by the drawing force of the drawing head 9 to form the annular pipe 10 with the same inner diameter as the outer diameter of the drawing head 9. The ring tube 10 has a very important function for the subsequent welding-fixed connection of the external feeding tube 11.

In the actual production, when food is extruded and stranded, the food is firstly required to be sent into the thin-wall boosting extrusion pipe 1, the food conveying purpose is realized through the feeding pipe 11, the feeding pipe 11 is usually fixed in the pipe blank in a welding and fixing mode, if the annular pipe 10 is not formed through a drawing process, a through hole matched with the feeding pipe 11 needs to be cut or dug on the pipe wall of the pipe blank, correspondingly, the part, matched with the through hole, at the bottom of the feeding pipe also needs to be subjected to the cutting design of the matched shape, so that the matching degree requirement of the feeding pipe and the feeding pipe at a joint can be met, because the circular pipe is always considered preferentially in the material selection of the feeding pipe 11, and thus, the shape edge of the through hole formed in the pipe blank and the matched shape of the feeding pipe are both space arc closed curves, this kind of all need set up the production design mode of the space arc closed curve of mutually supporting on pipe and conveying pipe both, the design degree of difficulty of product has been increased undoubtedly, in addition, the boost extrusion pipe in the actual production, often still heterotypic structure, the appearance of boost extrusion pipe is the round platform type structure of pipe diameter gradual change promptly, the design degree of difficulty of the space arc closed curve of matched with is bigger then, and just weld operation is carried out to space arc closed curve between them on the fixed form, this kind of operation mode of carrying out welded fastening to space arc closed curve has also increased the welding degree of difficulty undoubtedly, make product welding seam leakproofness be difficult to obtain effectual assurance, and after the welding, it can also be very troublesome to handle the welding seam of pipe spare inner wall, hardly reach the requirement of food security level, this can produce very big negative effects to the yields of product.

Therefore, referring to fig. 2 and 3, after the bulging process of the tube blank is completed, the position of the feed inlet of the tube blank is subjected to drawing treatment, so that the feed inlet of the tube blank can be drawn to form the annular tube 10 with the diameter matched with the diameter of the feed pipe 11 and integrally formed with the tube blank, and then the purpose of welding and fixing the feed pipe 11 on the annular tube 10 can be realized only by a circular tube welding process.

Step 5, machining and finishing a finished product: the tube blank after the completion of the drawing is subjected to machining treatment, redundant materials at the top of the ring-shaped tube 10 after the drawing are cut off, wherein the redundant materials at the top of the ring-shaped tube 10 refer to burrs, notches and the like at the top end of the ring-shaped tube 10, the top of the ring-shaped tube is leveled, the effect of facilitating subsequent welding of the feeding tube is achieved, therefore, the purpose that the burrs and the notches are used for leveling the top of the ring-shaped tube is that the feeding tube 11 is conveniently welded and fixed by adopting a circular tube welding process, the product quality is improved, the roundness of the tube blank is corrected later, the burrs of the whole tube blank are removed, the surface is polished, nondestructive detection is carried out, finished products are inspected, and the thin-wall boosting extruded tube 1 is manufactured.

The specific step of welding the feeding pipe 11 can be performed after leveling the top of the annular pipe 10, before welding the feeding pipe, a circular pipe with the caliber matched with that of the annular pipe 10 is selected as the feeding pipe 11, and then the circular pipe is welded to the top of the annular pipe through a circular pipe welding process.

In the actual production application, especially when being applied to the meat grinder with thin wall boosting extrusion pipe 1, the pay-off whereabouts direction of conveying pipe 11 if be in directly over the screw extrusion pole, often appears the problem that the meat hangs on the screw extrusion pole easily to make the screw propelling movement piece can not be fine with meat forward propelling movement, especially when the pay-off volume is great, if the meat material of whereabouts earlier can not be timely pushed to the discharge end by the screw propelling movement piece, will appear the meat material and pile up the problem on the conveying pipe, influence processing.

Therefore, in the embodiment, specifically, in the process that the drawing rod 8 drives the drawing head 9 to expand the drawing opening, the expansion displacement line of the drawing head 9 is staggered with the central axis of the tube blank, that is, the movement displacement line of the drawing head 9 during drawing is staggered with the central axis of the tube blank, because the central axis of the inner cavity channel of the annular tube 10 formed after the drawing head 9 expands the tube blank is the movement displacement line of the drawing head when the drawing head 9 is drawing, so the central axis of the formed feeding tube 11 is staggered with the central axis of the tube blank, and because the spiral extrusion rod is rotatably mounted on the thin-wall extrusion-assisted tube 1 along the central axis of the thin-wall extrusion-assisted tube, the feeding opening of the feeding tube 11 can be positioned above one side of the spiral extrusion rod instead of directly above, the feeding opening of the feeding tube 11 is set in an eccentric manner, that the feeding falling direction of the feeding tube 11 is one side of the spiral extrusion rod, when meat food is fed, the meat food can directly fall to one side of the spiral extrusion rod instead of the spiral extrusion rod, so that the spiral pushing piece can directly push the food when acting, and the purpose of improving the pushing efficiency is further achieved.

Specifically, in order to realize the purpose of designing the feeding pipe into an eccentric structure (i.e. the central axis of the feeding pipe 11 is staggered with the central axis of the thin-wall boosting extruded pipe), in this embodiment, referring to fig. 6, the drawing machine has a mandrel 12 whose shape is matched with the inner cavity of the pipe blank, the mandrel 12 is provided with a drawing cavity, the central axis a of the drawing cavity 13 is staggered with the central axis B of the mandrel 12, where the central axis a is an expansion displacement line of the drawing head 9, and the drawing head 9 is slidably connected with the drawing cavity 13; after the tube blank is fixed, the method further comprises the following steps:

putting a drawing head 9 into a drawing cavity 13, and putting a core rod 12 into an inner cavity of the tube blank;

the top opening of the drawing cavity 13 corresponds to the drawing opening 81 of the tube blank, the drawing rod 8 is inserted into the inner cavity of the tube blank, and then the drawing rod 8 and the drawing head 9 are fixedly connected.

By designing the mode of drawing the core rod 12 and arranging the drawing cavity 13 with the central axis staggered with the core rod 12 on the core rod 12, the purpose that the movement displacement line of the drawing head 9 is staggered with the central axis of the tube blank can be realized during drawing, and further the feeding pipe 11 of the manufactured thin-wall boosting extruded pipe 1 has an eccentric structure, and the stranding processing efficiency is improved.

Preferably, after the welding of the feeding pipe is finished, the tail end of the pipe blank is sealed, and the method comprises the following specific steps: referring to fig. 3, the end portion of the tube blank close to the annular tube 11 is used as the tail end of the tube blank, a sealing plate 14 matched with the caliber of the tail end of the tube blank is selected, and the sealing plate 14 is welded on the tail end of the tube blank to realize the sealing welding operation on the tail end of the tube blank.

Preferably, in the step 5 of correcting the roundness of the entire tube blank, the method further comprises correcting the roundness of the annular tube, wherein the step of correcting the roundness of the tube blank comprises the following specific steps: firstly, a tube blank correcting rod (not shown in the attached drawing) with the caliber equal to that of the target thin-wall boosting extruded tube is manufactured, then the tube blank correcting rod is inserted into the tube blank, and the aim of correcting the tube blank is achieved through the tube blank correcting rod with the standard size, wherein the circular degree of the annular tube is corrected through the specific steps of: firstly, manufacturing a ring pipe correcting rod with the caliber equal to that of a feeding pipe of the target thin-wall boosting extruded pipe, then repeatedly inserting the ring pipe correcting rod into the ring pipe, and realizing the purpose of correcting the roundness of the ring pipe by the ring pipe correcting rod with standard size.

The present example also discloses a thin-walled push-assisted extruded tube 1 made by the above-described production process, which, with reference to figures 2 and 3, the thickness of the tube wall of the thin-wall boosting extrusion tube 1 is 0.6mm-2.8mm, a plurality of convex walls 5 formed by the tube wall of the thin-wall boosting extrusion tube 1 protruding towards the inner cavity direction of the thin-wall boosting extrusion tube 1 are arranged on the inner wall of the thin-wall boosting extrusion tube 1, the convex walls 5 are manufactured by integral bulging through a bulging process, a gap between any two convex walls 5 forms a boosting groove 2, the thickness of the tube wall of the thin-wall boosting extrusion tube 1 is smaller than that of the traditional boosting extrusion tube 1', the weight is light, after the thin-wall boosting extruded tube 1 prepared by the bulging process is subjected to plastic deformation, the structural performance of the screw extrusion device is improved, the strength is enhanced, and the screw extrusion device is more favorable for being matched with a screw extrusion rod for use.

Preferably, the thin-walled boosting extruded tube 1 is made of brass, red copper or stainless steel.

Preferably, the outer wall of the thin-wall boosting extrusion pipe 1 is provided with an annular pipe 10 which is integrally formed with the side wall of the thin-wall boosting extrusion pipe 1, the annular pipe 10 is used for welding and fixing the feeding pipe 11, the pipe wall thickness of the annular pipe 10 is equal to that of the thin-wall boosting extrusion pipe 1, the annular pipe 10 is integrally formed by drawing, a space arc-shaped closed curve for welding the feeding pipe is not required to be formed on the pipe wall of the thin-wall boosting extrusion pipe 1, the purpose of fixedly connecting the feeding pipe 11 to the annular pipe can be achieved only by the annular pipe and a circular pipe welding process, the product design difficulty and the welding difficulty are reduced, the sealing performance of a welding line is guaranteed, the yield of a product can be guaranteed, and the production and manufacturing process becomes simple, easy and efficient.

Preferably, the central axis of the annular tube 10 is staggered with the central axis of the thin-wall boosting extrusion tube 1, the annular tube 10 is used for fixedly connecting the feeding tube 11, the annular tube 11 is arranged to be eccentric, namely, the feeding falling direction of the annular tube 11 is one side of the spiral extrusion rod, when meat food is fed, the meat food directly falls to one side of the spiral extrusion rod instead of the spiral extrusion rod, so that the spiral pushing piece can directly push the food when acting, and the purpose of improving the pushing efficiency is further realized.

The embodiment also discloses a grinding machine which is provided with the thin-wall boosting extrusion pipe manufactured by applying the production process.

The embodiment also discloses a household noodle maker which is provided with the thin-wall boosting extrusion pipe manufactured by applying the production process.

The beneficial effects of this embodiment:

compared with the traditional metal casting process, the thin-wall boosting extruded tube prepared by the production process has the advantages that the thickness of the tube wall is greatly reduced, the thickness of the tube wall can be directly reduced to be below the thickness of the tube wall which can not be achieved by the traditional metal casting process in the actual production, the production cost is greatly reduced, the production process combining the water expansion process and the drawing process is adopted, the corresponding production equipment is simpler, the production period is short, the production efficiency is greatly improved, the continuous production can be completely realized, the structural strength of the tube blank after bulging is improved, the metal performance is enhanced, and the application performance is very excellent, the integrated annular pipe formed by the drawing process greatly reduces the welding difficulty of the feeding pipe, ensures the sealing property of a welding line and can keep the yield of products at a high level.

Example 2

In addition, in order to achieve the purpose of designing the feeding pipe into an eccentric structure (i.e. the central axis of the feeding pipe is staggered with the central axis of the thin-wall boosting extruded pipe), in addition to the eccentric structure of the mandrel and the drawing cavity in embodiment 1, in this embodiment, a technical scheme of eccentric pipe straightening can be adopted, and specifically, referring to fig. 7, before the machining process is performed after the annular pipe is drawn on the pipe blank, the method further comprises the following steps:

eccentric straightening: the straightening rod 15 matched with the inner diameter of the tube cavity of the annular tube 10 is adopted, the straightening rod 15 is inserted into the annular tube 10, the straightening rod 15 rotates around the circumferential direction of the tube blank, the straightening rod 15 drives the whole tube wall of the annular tube 10 to deflect, and the central axis of the annular tube 10 is staggered with the central axis of the tube blank. After the annular pipe 10 is pulled out, the correcting rod 15 matched with the annular pipe 10 is inserted into the annular pipe 10, and then the correcting rod 15 is rotated clockwise or anticlockwise or pulled off in the circumferential direction of the pipe blank, so that the purpose of staggering the central axis of the annular pipe and the central axis of the pipe blank can be achieved, and the method is simple and efficient.

The beneficial effects of this embodiment: when the drawing head 9 is used for drawing operation, no matter whether the motion displacement line of the drawing head 9 is staggered with the central axis of the tube blank or not, the central axis of the annular tube 10 can be staggered with the central axis of the thin-wall boosting extruded tube 1 by adopting an eccentric tube straightening mode, and the eccentric design and manufacturing cost of a drawing cavity on the core rod is reduced.

Example 3

When the thin-wall boosting extrusion pipe 1 is applied to an actual product, for example, a meat grinder, the thin-wall boosting extrusion pipe 1 needs to be designed to be matched with other relevant parts in actual product equipment, in this embodiment, taking the meat grinder as an example, referring to fig. 8 and 9, when the thin-wall boosting extrusion pipe 1 is installed on the meat grinder, a meat emulsion outlet end of the meat grinder is an end of a tube blank of the thin-wall boosting extrusion pipe 1 away from an annular pipe 10, that is, an end of the tube blank away from the annular pipe 10 is a discharge end, an extrusion discharge part is also installed on the discharge end to improve meat grinding efficiency, the extrusion discharge part is generally an end cover 16, the end cover 16 is fixedly installed with the thin-wall boosting extrusion pipe 1, a plurality of discharge holes for discharging are opened on the end cover 16, and for the fixed installation manner of the end cover 16 and the thin-wall boosting extrusion pipe 1, generally, threaded connection is adopted, so when machining a tube blank after a drawing process, threads for mounting external matching parts need to be machined at the discharge end of the tube blank, and the tube wall thickness of the tube blank manufactured by the water swelling process is 0.6mm-2.8mm, so when machining the threads of the tube blank with a thin tube wall, for example, the discharge end of the tube blank with the wall thickness of 0.8mm-1.5mm, an auxiliary part machining mode can be adopted, and the specific machining steps are as follows:

firstly, auxiliary machining is carried out: the end part of the tube blank, which is far away from one end of the annular tube, is used as a discharge end, a sleeve with the inner diameter matched with the outer diameter of the tube wall at the discharge end of the tube blank is selected as an auxiliary mounting ring 17 for mounting and connecting an external discharge part, and the outer wall of the auxiliary mounting ring 17 is subjected to thread rolling or threading by using a thread rolling machine or a lathe, so that the auxiliary mounting ring 17 can be matched with the external part, wherein the thread rolling machine and the lathe are both existing equipment, threads are machined on tubular workpieces such as the auxiliary mounting ring by using the thread rolling machine as a conventional process, and redundant description is not repeated here.

Then, the auxiliary is installed: and fixedly sleeving the auxiliary mounting ring 17 after the rolling or threading is finished on the discharge end of the tube blank, preferably, fixedly welding the auxiliary mounting ring 17 after the auxiliary mounting ring is sleeved on the discharge end of the tube blank, and further processing the tube blank which can be used for mounting external parts such as an end cover 16 and the like.

Of course, when threading a tube blank having a relatively thick wall, the thread may be directly threaded on the tube blank by a thread rolling machine or a lathe without using the auxiliary machining form of the auxiliary mount ring 17.

In addition, the connection mode between the tube blank and the parts of the external product equipment is not limited to threaded connection and welding, and a fixed connection mode such as a screw or a bolt can be adopted.

The applicability of the thin-walled boost extruded tube 1 can be improved by machining threads on the tube blank for connecting parts such as the outer end cap 16.

Example 4

Referring to fig. 10, when the thin-wall boosting extrusion pipe 1 is applied to a juicer, because the juice discharged from the discharge port of the juicer is liquid, in order to adapt to the application characteristics of the juicer, in the matching design, a downward juice discharge port can be designed at the discharge end of a pipe blank, preferably, the juice discharge port can be formed by a secondary drawing process, so that the juice discharge port and the pipe blank form an integrated structure, an annular discharge pipe formed after secondary drawing can be directly used as a juice discharge pipe 18 after being machined and trimmed, other pipe fittings do not need to be additionally installed or welded as the discharge pipe 18, the production process is simplified, the production efficiency is improved, and the product quality is further improved.

Wherein, the step 4 in the embodiment 1 can be adopted as the process step of the secondary drawing, and in the specific operation, the caliber of the drawing head 9 is only required to be reduced to be consistent with the inner diameter of the target discharge pipe, which is not described in detail herein.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.