阅读说明：本技术 管件加工方法 (Pipe fitting machining method ) 是由 黄柯 张志海 苏天哲 廖凯 于 2021-06-29 设计创作，主要内容包括：本发明涉及管件加工领域,公开了一种管件加工方法,其中,所述管件加工方法包括：S1、对毛坯管件做初步加工处理；S2、对毛坯管件的端部做整形处理；S3、对毛坯管件的端部做精尺处理,以制成端部精尺管件。通过上述技术方案,通过端部整形和端部精尺仅对管件的端部进行加工,以制成端部尺寸精确的管件,满足与其他管件或接头的连接要求,不需要对端部之外的部分做精尺加工,减少了加工工序和加工成本,提高了加工效率。(The invention relates to the field of pipe fitting machining, and discloses a pipe fitting machining method, wherein the pipe fitting machining method comprises the following steps: s1, performing primary processing treatment on the blank pipe fitting; s2, shaping the end part of the blank pipe fitting; and S3, performing fine rule processing on the end part of the blank pipe fitting to manufacture the end part fine rule pipe fitting. Through the technical scheme, the end part of the pipe fitting is only processed through end part shaping and end part fine rule, so that the pipe fitting with the accurate size of the end part is manufactured, the connection requirement of other pipe fittings or joints is met, the fine rule processing of the part outside the end part is not needed, the processing procedures and the processing cost are reduced, and the processing efficiency is improved.)

1. A pipe processing method, characterized by comprising:

s1, performing primary processing treatment on the blank pipe fitting;

s2, shaping the end part of the blank pipe fitting;

and S3, performing fine rule processing on the end part of the blank pipe fitting to manufacture the end part fine rule pipe fitting.

2. The pipe processing method according to claim 1, wherein in S1, the preliminary processing treatment includes blanking the blank pipe.

3. A pipe machining method according to claim 1, characterized in that in S2, the end of the blank pipe is subjected to a shaping process using a die-expanding mandrel (13).

4. The pipe machining method according to claim 1, wherein in S3, the ends of the blank pipe are finished with an end finish heading die (10).

5. A pipe machining method according to claim 1, characterized in that in S3, the ends of the blank pipe are finished with an end finishing die (8).

6. The pipe processing method according to claim 1, wherein in S2, the end portion of the blank pipe is heated and then subjected to a shaping process.

7. A method of pipe work as claimed in claim 1 wherein the ends of the blank pipe are heated and finished at S3.

8. A method of pipe work as claimed in claim 6 or 7 wherein the ends of the blank pipe are heated using an electromagnetic induction coil heating means for a corresponding fixed length of time.

9. A method as claimed in claim 1, wherein in S2 and/or S3, corresponding clamps are used for different batches of said blank tubes, different marking textures being provided on the clamping faces of different said clamps to form different markings on different batches of said blank tubes.

10. A method of pipe machining as claimed in any one of claims 1 to 9, wherein the blank pipe is a seamless steel pipe.

Technical Field

The invention relates to pipe fitting machining, in particular to a pipe fitting machining method.

Background

At present, the fine drawing seamless steel pipe in the market is applied to a hydraulic fluid connection process and has the following four forms: the metal sealing ferrule nut, the elastic sealing pipeline forming and the 37-degree flaring can only be matched with the finish drawing seamless steel pipe, and the price of the finish drawing seamless steel pipe is exponentially higher than that of the seamless steel pipe.

At present, a seamless tube blank is subjected to cold drawing for multiple times, and finally, a high-precision die is used for finish drawing to obtain a finish-drawn seamless tube. With the development of industry, the influence of material cost on product price is larger and larger, and the current process cannot meet the cost requirement in the industry.

Disclosure of Invention

The invention aims to provide a pipe fitting machining method to solve the problem of bias machining cost of a finish-drawn steel pipe.

In order to achieve the above object, the present invention provides a pipe processing method, comprising: s1, performing primary processing treatment on the blank pipe fitting; s2, shaping the end part of the blank pipe fitting; and S3, performing fine rule processing on the end part of the blank pipe fitting to manufacture the end part fine rule pipe fitting.

Optionally, in S1, the preliminary working process includes blanking the blank tube.

Optionally, in S2, the ends of the blank tube are reshaped using a die expanding mandrel.

Optionally, in S3, the ends of the blank tube are finished with a finish gauge using an end finish heading die.

Optionally, in S3, the ends of the blank tube are finished using an end finish drawing die.

Optionally, in S2, the ends of the blank tube are heated and then reshaped.

Optionally, in S3, the ends of the blank tube are heated and finished.

Optionally, the end of the blank tube is heated for a corresponding fixed length of time using an electromagnetic induction coil heating device.

Optionally, in S2 and/or S3, corresponding clamps are used for different batches of the blank pipes, and different mark textures are provided on the clamping surfaces of the different clamps, so as to form different marks on the different batches of the blank pipes.

Optionally, the blank pipe is a seamless steel pipe.

Through the technical scheme, the end part of the pipe fitting is only processed through end part shaping and end part fine rule, so that the pipe fitting with the accurate size of the end part is manufactured, the connection requirement of other pipe fittings or joints is met, the fine rule processing of the part outside the end part is not needed, the processing procedures and the processing cost are reduced, and the processing efficiency is improved.

Fig. 1 is a schematic structural view of a pipe machining apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a hydraulic circuit according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of an end shaping mold according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of an end fine upsetting die according to an embodiment of the invention;

FIG. 5 is a schematic structural diagram of a pipe machining apparatus according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a hydraulic circuit according to an embodiment of the present invention;

FIG. 7 is a schematic structural view of an end finish drawing die according to an embodiment of the present invention;

fig. 8 is a flow chart of a method of manufacturing a pipe according to an embodiment of the present invention.

Description of the reference numerals

1-an end shaping die, 2-a clamp, 3-a support frame, 4-a die oil cylinder, 5-a clamp oil cylinder, 6-a feeding oil cylinder, 7-a shaping oil cylinder, 8-an end fine drawing die, 9-a fine drawing oil cylinder, 10-an end fine upsetting die, 11-a fine upsetting oil cylinder, 12-a fine upsetting mandrel, 13-a die expanding mandrel, 14-an electromagnetic induction coil heating device, 30-a pipe fitting, 61-an oil tank, 62-an oil pump, 63-a motor, 64-an overflow valve, 65-a first reversing valve, 66-a second reversing valve, 67-a sequence valve and 68-a hydraulic lock.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

The noun explains:

blanking: cutting the pipe fitting to obtain the pipe fitting with the length required by the product

Shaping: the end of the pipe fitting is processed, so that the inner diameter of the pipe fitting is increased, the pipe fitting is processed to a standard size, and the problem that a subsequent precise ruler cannot be processed in place when the inner diameter of the pipe is poor is avoided.

Fine sizing: the process of machining the pipe diameter to within the required size range.

The invention provides a pipe fitting machining method, wherein as shown in fig. 8, the pipe fitting machining method comprises the following steps:

s1, performing primary processing treatment on the blank pipe fitting;

s2, shaping the end part of the blank pipe fitting;

and S3, performing fine rule processing on the end part of the blank pipe fitting to manufacture the end part fine rule pipe fitting.

At S1, the preliminary machining process machines a blank pipe (e.g., a cold drawn steel pipe or other type of steel pipe) into a substantially formed pipe except for the ends.

In S2, the end of the pipe may be shaped to be closer to the target size and the target shape, and the end having the original irregular shape may be formed into the target shape, for example, a pipe having a circular inner peripheral surface, for the rough machining.

At S3, the finishing process is performed on the ends of the pipe to make the ends more accurate and substantially the same size as the target size (with a small error, within an acceptable range).

The existing application of the finish-drawn seamless steel pipe in carrying hydraulic fluid has high requirements on the size of the end of a raw material, but has no requirements on the size of the middle of a pipeline, and the finish-drawn seamless steel pipe is used in the whole process, so that the material waste is large and the processing time is long; the price of the fine drawing seamless steel tube is exponentially higher than that of the seamless steel tube, and the product cost is high.

The pipe fitting processing method of the scheme aims at processing the end part of a blank pipe fitting, in particular to a pipe fitting, such as a steel pipe. The steps S2 and S3 are core steps, only the end part of the pipe fitting is processed, so that the end part of the pipe fitting reaches the required size, the connection with other pipe fittings or joints can be realized, the part between the end parts does not need to be precisely processed, and the cost can be saved.

In this scheme, only process the tip of pipe fitting through tip plastic and tip smart chi to make the pipe fitting that tip size is accurate, satisfy with the connection requirement of other pipe fittings or joints, need not do the smart chi processing to the part outside the tip, reduced manufacturing procedure and processing cost, improved machining efficiency.

Further, in S1, the preliminary working process includes blanking the blank pipe. Through blanking treatment, redundant parts at the end parts of the blank pipe fittings can be removed, and subsequent processing treatment is facilitated.

Wherein in S2, the end of the blank tube is reshaped using the die expanding mandrel 13. The die expanding mandrel 13 or the blank pipe may be driven to move relative to each other so that the die expanding mandrel 13 is inserted into the end of the blank pipe so that the inner diameter of the end of the pipe is increased and the inner peripheral surface thereof is formed in a circular shape, achieving primary truing of the end of the pipe.

Specifically, in S3, the end of the blank tube is finished using the end finish heading die 10. As shown in fig. 4, the end fine upsetting die 10 comprises two openable half dies and an upsetting die core rod 12, the upsetting die core rod 12 is partially clamped between the two half dies and partially surrounded by the two half dies to form a fine upsetting cavity, and the fine upsetting oil cylinder 11 drives the end fine upsetting die 10 to move to allow the end of the pipe to be inserted into the fine upsetting cavity to realize fine upsetting.

Specifically, according to another embodiment of the present invention, in S3, the end of the blank pipe is finished with the end finishing die 8. As shown in fig. 4, the end fine-drawing die 8 includes two openable half dies, the two half dies enclose a fine-drawing cavity, and the fine-drawing cylinder 9 can drive the pipe fitting 30 to be inserted into the fine-drawing cavity, so as to perform fine-drawing processing on the end of the pipe fitting.

In S2, the end of the blank pipe is heated and then subjected to a shaping process. After the end part of the pipe fitting is heated, the hardness is reduced, the pipe fitting is easier to deform, and the shaping treatment is convenient to carry out.

Similarly, in S3, the ends of the blank tube are heated and finished. Similarly, the ends of the heated tubes are ready for finishing.

And heating the end part of the blank pipe fitting for a corresponding fixed time by using an electromagnetic induction coil heating device. The electromagnetic induction coil can carry out induction heating to the blank pipe fitting to, its heating method is heating for fixed duration, confirms heating time according to the parameter of blank pipe fitting and electromagnetic induction coil's parameter promptly, carries out the heating for specific duration to the blank pipe fitting for the temperature of pipe fitting is more accurate relatively, and the temperature of different pipe fittings is close, and is corresponding, and its intensity, plasticity etc. also physical properties are more close, guarantee that the final size of different pipe fittings is the same basically.

Specifically, when the pipe enters the electromagnetic induction coil, the induction coil is electrified, and after the pipe is heated for a preset time, the induction coil is powered off; wherein the current frequency is 3-5 KHZ. The heat time of pipe fitting is confirmed according to the wall thickness of pipe fitting, the unit of getting the wall thickness is the numerical value l of millimeter, the unit of heat time is the numerical value t of second, then t is 22.5l +37.5, can calculate the required heat time of pipe fitting of different wall thicknesses according to this formula of calculating, make the temperature after the pipe fitting heating be in comparatively stable scope, it is corresponding, the physical properties of pipe fitting is also comparatively stable, the difference of different pipe fittings is less, be convenient for process out the performance, the same accurate chi pipe fitting of technical index basic.

In addition, in S2 and/or S3, corresponding clamps are used for different batches of the blank pipes, and different mark textures are arranged on the clamping surfaces of the different clamps so as to form different marks on the different batches of the blank pipes. The pipe fitting processing equipment can adopt different clamps 2 according to different batches of pipe fittings, marking textures are arranged on the clamping surfaces of the clamps 2, and marks can be formed on the outer surface of the pipe fitting 30 when the pipe fitting 30 is clamped, so that products can be traced in the future.

Wherein, the blank pipe fitting is a seamless steel pipe.

The finishing rule processing in the scheme mainly comprises end part finishing upsetting and end part finishing drawing, and two different pipe fitting processing devices used for the pipe fitting processing method in the scheme are described below.

Pipe fitting processing equipment comprising end part fine upsetting die 10

The invention provides a pipe fitting machining device which comprises an end part shaping die 1 located at a first station and an end part fine upsetting die 10 located at a second station, wherein the pipe fitting machining device can firstly perform primary end part shaping on a pipe fitting through the end part shaping die 1 and then perform fine upsetting on the end part of the pipe fitting through the end part fine upsetting die 10 to manufacture an end part fine ruler pipe fitting.

The pipe machining apparatus can perform end machining on a pipe, particularly for metal pipes such as steel pipes, and can perform drawing (e.g., cold drawing) on the pipe multiple times and blanking at the end before machining the pipe by using the pipe machining apparatus.

The pipe fitting machining equipment comprises an end part shaping die 1 and an end part fine upsetting die 10, wherein the end part shaping die 1 can carry out primary shaping on the end part of the pipe fitting, so that the end part of the pipe fitting is preliminarily formed into a target shape (for example, shaped into a standard circle) and is closer to a target size; then, the end of the preliminarily shaped pipe fitting is subjected to finish rule machining (namely, precise dimension machining) through the end fine upsetting die 10, so that the dimension of the end is more precise and meets the target dimension, namely, the end of the pipe fitting is machined into the target dimension in a fine upsetting mode.

In this scheme, only process the tip of pipe fitting through tip plastic mould and tip smart heading mould to make the pipe fitting that tip size is accurate, satisfy with the connection requirement of other pipe fittings or joints, need not do smart chi processing to the part outside the tip, reduced manufacturing procedure and processing cost, improved machining efficiency.

In addition, the pipe fitting machining equipment comprises a die oil cylinder 4 which can drive the end shaping die 1 and the end fine upsetting die 10 to open and close. The end shaping die 1 and the end fine upsetting die 10 can open and close the dies in a specific direction respectively, the dies need to be closed before the end of the pipe is machined, and the dies need to be opened to draw out the pipe after the end of the pipe is machined. In the pipe fitting processing equipment of this scheme, the direction of opening and shutting of setting up tip plastic mould 1 and tip finish upsetting mould 10 to keep unanimous to can connect two moulds through the linkage, and drive two moulds through single mould hydro-cylinder 4 and open and shut in step, make the pipe fitting 30 of first station and second station can carry out the tip processing in step.

Wherein the pipe can be inserted into the end shaping die 1 and the end finish heading die 10 in a first direction, respectively, and the end shaping die 1 and the end finish heading die 10 are arranged in a second direction perpendicular to the first direction. Referring to fig. 1, the left-right direction is a first direction, and the up-down direction is a second direction. The pipe 30 extends in a first direction and is movable in the first direction relative to the end sizing die 1 and the end finish heading die 10 to insert or remove from the corresponding dies to effect machining of the ends of the pipe.

In addition, the pipe fitting machining equipment comprises a clamp 2 arranged at the first station and the second station, a clamp oil cylinder 5 used for driving the clamp 2, and a feeding oil cylinder 6 used for driving a pipe fitting to move from the first station to the second station. The first station and the second station can be respectively provided with a clamp 2 for clamping the pipe 30 positioned on the first station or the second station, and the clamp oil cylinder 5 can drive the clamp 2 to open and close so as to release and clamp the pipe 30. In some embodiments, the first and second stations of the gripper 2 and 2 may be connected by a linkage to open and close synchronously and driven by a single gripper cylinder 5; of course, the first station gripper 2 and the second station gripper 2 may be independent of each other and driven by different gripper cylinders 5. The feed cylinder 6 can drive the tube 30 from the first station to the second station in a direction corresponding to the second direction.

The pipe fitting processing equipment can adopt different clamps 2 according to different batches of pipe fittings 30, different marking textures are arranged on clamping surfaces of the different clamps 2, and marks can be formed on the outer surface of the pipe fitting 30 when the pipe fitting 30 is clamped, so that products can be traced in the future.

In addition, the end shaping die 1 includes a die expanding mandrel 13, and the pipe machining apparatus includes a shaping cylinder 7 that drives the end shaping die 1 to move in the first direction. As shown in fig. 3, the end shaping die 1 includes two openable and closable die halves and a die expanding mandrel 13 clamped between the die halves, and the die expanding mandrel 13 can be inserted into an end of the pipe 30 to expand an inner diameter thereof to a target size, and particularly, can form an inner circumferential surface of the pipe 30 into a circular shape. Wherein, the pipe fitting 30 clamped and fixed by the clamp 2 can be fixed at the first station, and the shaping oil cylinder 7 drives the die expanding mandrel 13 (or the whole end shaping die 1) to move towards the pipe fitting 30 so as to insert the die expanding mandrel 13 into the end of the pipe fitting to realize the primary shaping. The outer diameter of the die expanding mandrel 13 may be greater than the inner diameter of the end of the pipe to be swaged.

Wherein, tip finish-heading mould 10 includes heading die plug 12, the pipe fitting processing equipment is including the drive tip finish-heading mould 10 is followed the finish-heading hydro-cylinder 11 that first direction removed. As shown in fig. 4, the end fine upsetting die 10 comprises two openable half dies and an upsetting die core rod 12, the upsetting die core rod 12 is partially clamped between the two half dies and partially surrounded by the two half dies to form a fine upsetting cavity, and the fine upsetting oil cylinder 11 drives the end fine upsetting die 10 to move to allow the end of the pipe to be inserted into the fine upsetting cavity to realize fine upsetting.

In addition, the pipe fitting processing equipment comprises a support frame 3 which supports the end part shaping die 1 and the end part fine upsetting die 10 respectively, and the die oil cylinder 4 can drive the support frame 3 to deform so as to drive the end part shaping die 1 and the end part fine upsetting die 10 to open and close respectively. As shown in fig. 1, the supporting frame 3 includes an L-shaped connecting rod and a lever, one end of the connecting rod is connected to the lever, the other end of the connecting rod is connected to one half die, the other end of the lever is connected to the other half die, the connecting rod, the lever and the die enclose a quadrilateral, and at this time, the connecting rod, the lever and the die are in a die closing state, when the die cylinder 4 drives the connecting rod to move along the second direction, the lever and the connecting rod rotate around a fulcrum, and the two half dies are relatively far away from each other, so that the die opening is realized.

In addition, as shown in fig. 5, an electromagnetic induction coil heating device 14 is located in front of (or only in front of) the end shaping die 1 and the end finish heading die 10, and the pipe can be moved through the electromagnetic induction coil heating device 14 to electromagnetically induction heat the end of the pipe before the pipe 30 enters the dies.

Particularly, when the pipe enters the electromagnetic induction coil heating device 14, the induction coil is electrified, and after the pipe is heated for a preset time, the induction coil is powered off; wherein the current frequency is 3-5 KHZ. The heat time of pipe fitting is confirmed according to the wall thickness of pipe fitting, the unit of getting the wall thickness is the numerical value l of millimeter, the unit of heat time is the numerical value t of second, then t is 22.5l +37.5, can calculate the required heat time of pipe fitting of different wall thicknesses according to this formula of calculating, make the temperature after the pipe fitting heating be in comparatively stable scope, it is corresponding, the physical properties of pipe fitting is also comparatively stable, the difference of different pipe fittings is less, be convenient for process out the performance, the same accurate chi pipe fitting of technical index basic.

Wherein the electromagnetic induction coil heating device 14 comprises an electromagnetic induction coil into which the end of the pipe can be inserted to achieve induction heating; the electromagnetic induction coil is electrically connected with the time relay, and the time relay can be set to be disconnected after being communicated for fixed time, so that the electromagnetic induction coil is powered off after being powered on for fixed time, correspondingly, the pipe fitting can be heated and fixed for a long time, and the heating time of each pipe fitting is guaranteed to be the same.

The wall thickness of the pipe fitting is 1-5mm, and correspondingly, the heating time is 60-150 s.

In addition, the pipe fitting processing equipment comprises a hydraulic driving mechanism, wherein the hydraulic driving mechanism is provided with an oil tank 61, an oil pump 62, the die oil cylinder 4, the clamp oil cylinder 5, the feeding oil cylinder 6, the shaping oil cylinder 7 and the fine upsetting oil cylinder 11. As shown in fig. 2, the die cylinder 4, the clamp cylinder 5, the feeding cylinder 6, the shaping cylinder 7 and the fine upsetting cylinder 11 are arranged in the same hydraulic pipeline and are hydraulically driven by the same oil pump 62, and the oil pump 62 is in transmission connection with a motor 63 and is driven by the motor 63 to operate. The oil inlet pipe of the oil pump 62 is provided with a one-way valve, and is connected with an overflow pipe, and an overflow valve 64 is arranged on the overflow pipe.

The feeding oil cylinder 6, the shaping oil cylinder 7 and the fine upsetting oil cylinder 11 are respectively connected with an oil inlet pipe and an oil return pipe through three first reversing valves 65. The feeding oil cylinder 6, the shaping oil cylinder 7 and the fine upsetting oil cylinder 11 are connected in parallel and are mutually independent, a pipeline where each oil cylinder is located is provided with a first reversing valve 65, and the first reversing valves 65 realize the cutting, communication and reversing of the pipelines so as to control the extension and retraction of the corresponding oil cylinders. When the pipe fitting processing equipment runs, the feeding oil cylinder 6, the shaping oil cylinder 7 and the fine upsetting oil cylinder 11 can be respectively and independently controlled.

And hydraulic locks 68 are arranged on pipelines of the feeding oil cylinder 6, the shaping oil cylinder 7 and the fine upsetting oil cylinder 11 respectively. The hydraulic lock 68 is arranged on the oil inlet pipe and the oil return pipe, and can disconnect or connect pipelines, so that the safety is improved.

In addition, the mold cylinder 4 and the clamp cylinder 5 are connected in parallel to an oil inlet pipe and an oil return pipe through a second reversing valve 66, wherein a sequence valve 67 is arranged on a pipeline of a cavity with a rod of the mold cylinder 4, and a sequence valve 67 is arranged on a pipeline without a rod of the clamp cylinder 5; or a sequence valve 67 is arranged on the rodless cavity pipeline of the mold oil cylinder 4, and a sequence valve 67 is arranged on the rod cavity pipeline of the clamp oil cylinder 5. The mold cylinder 4 and the clamp cylinder 5 are connected in parallel with each other, and the rodless cavity of the mold cylinder 4 communicates with the rodless cavity of the clamp cylinder 5, and the rod cavity of the mold cylinder 4 communicates with the rod cavity of the clamp cylinder 5.

In one embodiment, a sequence valve 67 is arranged on the rodless cavity pipeline of the mold cylinder 4, a sequence valve 67 is arranged on the rod cavity pipeline of the clamp cylinder 5, when the second reversing valve 66 enables the oil inlet pipe to be communicated with the rod cavity pipeline of the mold cylinder 4 and the rod cavity pipeline of the clamp cylinder 5, the mold cylinder 4 extends out, the clamp cylinder 5 is kept static, when the mold cylinder 4 extends completely, the sequence valve 67 on the rod cavity pipeline of the clamp cylinder 5 starts to be communicated under higher oil pressure, and the clamp cylinder 5 starts to extend; when the second direction change valve 66 causes the oil feed pipe to communicate with the rodless chamber line of the mold cylinder 4 and the rodless chamber line of the jig cylinder 5, the jig cylinder 5 starts to retract while the mold cylinder 4 remains stationary, and when the jig cylinder 5 is completely retracted, the sequence valve 67 on the rod chamber line of the mold cylinder 4 starts to communicate at a greater oil pressure. In this embodiment, the mold cylinder 4 extends out of the clamp cylinder 5 and then extends out, and the clamp cylinder 5 retracts back after retracting the mold cylinder 4, so that the mold is closed first and then the pipe 2 is clamped by the clamp 2, and then the clamp 2 releases the pipe mold and opens the mold.

In another embodiment, the pipe line of the rod cavity of the mold cylinder 4 is provided with a sequence valve 67, and the pipe line of the rodless cavity of the clamp cylinder 5 is provided with a sequence valve 67, which is the same as the principle of the above embodiment, and the mold and the clamp can be opened and closed according to a specific sequence, which will not be repeated herein.

Pipe fitting processing equipment comprising end part fine drawing die 8

The invention provides pipe fitting machining equipment, which comprises an end part shaping die 1 positioned at a first station and an end part fine drawing die 8 positioned at a second station, wherein the pipe fitting machining equipment can firstly carry out primary end part shaping on a pipe fitting through the end part shaping die 1 and then carry out fine drawing on the end part of the pipe fitting through the end part fine drawing die 8 so as to manufacture an end part fine ruler pipe fitting.

The pipe machining apparatus can perform end machining on a pipe, particularly for metal pipes such as steel pipes, and can perform drawing (e.g., cold drawing) on the pipe multiple times and blanking at the end before machining the pipe by using the pipe machining apparatus.

The pipe fitting machining equipment comprises an end part shaping die 1 and an end part fine drawing die 8, wherein the end part shaping die 1 can carry out primary shaping on the end part of the pipe fitting, so that the end part of the pipe fitting is preliminarily formed into a target shape (for example, shaped into a standard circle) and is closer to a target size; then, the end of the preliminarily shaped pipe fitting is subjected to finish machining (namely, precise size machining) through the end finish drawing die 8, so that the size of the end is more precise and meets the target size, and the end of the pipe fitting is machined to the target size in a finish drawing mode.

In this scheme, only process the tip of pipe fitting through tip plastic mould and tip finish drawing mould to make the pipe fitting that tip size is accurate, satisfy with the connection requirement of other pipe fittings or joint, need not do the finish rule processing to the part outside the tip, reduced manufacturing procedure and processing cost, improved machining efficiency.

In addition, the pipe fitting processing equipment comprises a die oil cylinder 4 which can drive the end shaping die 1 and the end fine drawing die 8 to open and close. The end shaping die 1 and the end finish drawing die 8 can be respectively opened and closed along a specific direction, the dies need to be closed before the end of the pipe is processed, and the dies need to be opened to draw out the pipe after the end of the pipe is processed. In the pipe fitting processing equipment of this scheme, set up the direction of opening and shutting of tip plastic mould 1 and tip finish draw mould 8 to keep unanimous to can connect two moulds through the linkage, and drive two moulds through single mould hydro-cylinder 4 and open and shut synchronously, make the pipe fitting 30 of first station and second station can carry out the tip processing synchronously.

Wherein the pipe is insertable into the end shaping die 1 and the end finish drawing die 8, respectively, in a first direction, and the end shaping die 1 and the end finish drawing die 8 are aligned in a second direction perpendicular to the first direction. Referring to fig. 5, the left-right direction is a first direction, and the up-down direction is a second direction. The pipe 30 extends in a first direction and is movable in the first direction relative to the end shaping die 1 and the end finish drawing die 8 to insert into or remove from the respective dies to effect machining of the ends of the pipe.

In addition, the pipe fitting machining equipment comprises a clamp 2 arranged at the first station and the second station, a clamp oil cylinder 5 used for driving the clamp 2, and a feeding oil cylinder 6 used for driving a pipe fitting to move from the first station to the second station. The first station and the second station can be respectively provided with a clamp 2 for clamping the pipe 30 positioned on the first station or the second station, and the clamp oil cylinder 5 can drive the clamp 2 to open and close so as to release and clamp the pipe 30. In some embodiments, the first and second stations of the gripper 2 and 2 may be connected by a linkage to open and close synchronously and driven by a single gripper cylinder 5; of course, the first station gripper 2 and the second station gripper 2 may be independent of each other and driven by different gripper cylinders 5. The feed cylinder 6 can drive the tube 30 from the first station to the second station in a direction corresponding to the second direction.

The pipe fitting processing equipment can adopt different clamps 2 according to different batches of pipe fittings 30, different marking textures are arranged on clamping surfaces of the different clamps 2, and marks can be formed on the outer surface of the pipe fitting 30 when the pipe fitting 30 is clamped, so that products can be traced in the future.

In addition, the end shaping die 1 includes a die expanding mandrel 13, and the pipe machining apparatus includes a shaping cylinder 7 that drives the end shaping die 1 to move in the first direction. As shown in fig. 3, the end shaping die 1 includes two die halves and a die expanding mandrel 13 clamped between the die halves, and the die expanding mandrel 13 may be inserted into an end of the pipe 30 to expand an inner diameter thereof to a target size, and particularly, may form an inner circumferential surface of the pipe 30 in a circular shape. Wherein, the pipe fitting 30 clamped and fixed by the clamp 2 can be fixed at the first station, and the shaping oil cylinder 7 drives the die expanding mandrel 13 (or the whole end shaping die 1) to move towards the pipe fitting 30 so as to insert the die expanding mandrel 13 into the end of the pipe fitting to realize the primary shaping. The outer diameter of the die expanding mandrel 13 may be greater than the inner diameter of the end of the pipe to be swaged.

In addition, the pipe machining equipment comprises a fine drawing oil cylinder 9 which is positioned at the second station and is used for driving the pipe to face and be far away from the end fine drawing die 8. As shown in fig. 7, the end fine-drawing die 8 includes two openable half dies, the two half dies enclose a fine-drawing cavity, and the fine-drawing cylinder 9 can drive the pipe 30 to be inserted into the fine-drawing cavity, so as to perform fine-drawing processing on the end of the pipe.

In addition, the pipe fitting processing equipment comprises a support frame 3 which supports the end part shaping die 1 and the end part fine drawing die 8 respectively, and the die oil cylinder 4 can drive the support frame 3 to deform so as to drive the end part shaping die 1 and the end part fine drawing die 8 to open and close respectively. As shown in fig. 5, the supporting frame 3 includes an L-shaped connecting rod and a lever, one end of the connecting rod is connected to the lever, the other end of the connecting rod is connected to one half die, the other end of the lever is connected to the other half die, the connecting rod, the lever and the die enclose a quadrilateral, and at this time, the connecting rod, the lever and the die are in a die closing state, when the die cylinder 4 drives the connecting rod to move along the second direction, the lever and the connecting rod rotate around a fulcrum, and the two half dies are relatively far away from each other, so that the die opening is realized.

In addition, as shown in fig. 1, an electromagnetic induction coil heating device 14 is located in front of (or only in front of) the end shaping die 1 and the end finish drawing die 8, the pipe can be moved through the electromagnetic induction coil heating device 14, and the end of the pipe can be electromagnetically induction heated before the pipe 30 enters the die.

Particularly, when the pipe enters the electromagnetic induction coil heating device 14, the induction coil is electrified, and after the pipe is heated for a preset time, the induction coil is powered off; wherein the current frequency is 3-5 KHZ. The heat time of pipe fitting is confirmed according to the wall thickness of pipe fitting, the unit of getting the wall thickness is the numerical value l of millimeter, the unit of heat time is the numerical value t of second, then t is 22.5l +37.5, can calculate the required heat time of pipe fitting of different wall thicknesses according to this formula of calculating, make the temperature after the pipe fitting heating be in comparatively stable scope, it is corresponding, the physical properties of pipe fitting is also comparatively stable, the difference of different pipe fittings is less, be convenient for process out the performance, the same accurate chi pipe fitting of technical index basic.

Wherein the electromagnetic induction coil heating device 14 comprises an electromagnetic induction coil into which the end of the pipe can be inserted to achieve induction heating; the electromagnetic induction coil is electrically connected with the time relay, and the time relay can be set to be disconnected after being communicated for fixed time, so that the electromagnetic induction coil is powered off after being powered on for fixed time, correspondingly, the pipe fitting can be heated and fixed for a long time, and the heating time of each pipe fitting is guaranteed to be the same.

The wall thickness of the pipe fitting is 1-5mm, and correspondingly, the heating time is 60-150 s.

In addition, the pipe fitting processing equipment comprises a hydraulic driving mechanism, wherein the hydraulic driving mechanism is provided with an oil tank 61, an oil pump 62, the die oil cylinder 4, the clamp oil cylinder 5, the feeding oil cylinder 6, the fine drawing oil cylinder 9 and the shaping oil cylinder 7. As shown in fig. 6, the die cylinder 4, the clamp cylinder 5, the feeding cylinder 6, the shaping cylinder 7 and the finish drawing cylinder 9 are arranged in the same hydraulic pipeline and are hydraulically driven by the same oil pump 62, and the oil pump 62 is in transmission connection with the motor 63 and is driven by the motor 63 to operate. The oil inlet pipe of the oil pump 62 is provided with a one-way valve, and is connected with an overflow pipe, and an overflow valve 64 is arranged on the overflow pipe.

The feeding oil cylinder 6, the fine drawing oil cylinder 9 and the shaping oil cylinder 7 are respectively connected to an oil inlet pipe and an oil return pipe through three first reversing valves 65. The feeding oil cylinder 6, the shaping oil cylinder 7 and the fine drawing oil cylinder 9 are connected in parallel and are mutually independent, a pipeline where each oil cylinder is located is provided with a first reversing valve 65, and the first reversing valves 65 realize the cutting, communication and reversing of the pipelines so as to control the extension and retraction of the corresponding oil cylinders. When the pipe fitting processing equipment runs, the feeding oil cylinder 6, the shaping oil cylinder 7 and the fine drawing oil cylinder 9 can be respectively and independently controlled.

And hydraulic locks 68 are arranged on pipelines of the feeding oil cylinder 6, the fine pulling oil cylinder 9 and the shaping oil cylinder 7 respectively. The hydraulic lock 68 is arranged on the oil inlet pipe and the oil return pipe, and can disconnect or connect pipelines, so that the safety is improved.

In addition, the mold cylinder 4 and the clamp cylinder 5 are connected in parallel to an oil inlet pipe and an oil return pipe through a second reversing valve 66, wherein a sequence valve 67 is arranged on a pipeline of a rod cavity of the mold cylinder 4, and a sequence valve 67 is arranged on a pipeline of a non-rod cavity of the clamp cylinder 5; or a sequence valve 67 is arranged on the rodless cavity pipeline of the mold oil cylinder 4, and a sequence valve 67 is arranged on the rod cavity pipeline of the clamp oil cylinder 5. The mold cylinder 4 and the clamp cylinder 5 are connected in parallel with each other, and the rodless cavity of the mold cylinder 4 communicates with the rodless cavity of the clamp cylinder 5, and the rod cavity of the mold cylinder 4 communicates with the rod cavity of the clamp cylinder 5. In fig. 6, the pipelines in which the two clamp cylinders 5 are located are substantially the same.

In one embodiment, a sequence valve 67 is arranged on the rodless cavity pipeline of the mold cylinder 4, a sequence valve 67 is arranged on the rod cavity pipeline of the clamp cylinder 5, when the second reversing valve 66 enables the oil inlet pipe to be communicated with the rod cavity pipeline of the mold cylinder 4 and the rod cavity pipeline of the clamp cylinder 5, the mold cylinder 4 extends out, the clamp cylinder 5 is kept static, when the mold cylinder 4 extends completely, the sequence valve 67 on the rod cavity pipeline of the clamp cylinder 5 starts to be communicated under higher oil pressure, and the clamp cylinder 5 starts to extend; when the second direction change valve 66 causes the oil feed pipe to communicate with the rodless chamber line of the mold cylinder 4 and the rodless chamber line of the jig cylinder 5, the jig cylinder 5 starts to retract while the mold cylinder 4 remains stationary, and when the jig cylinder 5 is completely retracted, the sequence valve 67 on the rod chamber line of the mold cylinder 4 starts to communicate at a greater oil pressure. In this embodiment, the mold cylinder 4 extends out of the clamp cylinder 5 and then extends out, and the clamp cylinder 5 retracts back after retracting the mold cylinder 4, so that the mold is closed first and then the pipe 2 is clamped by the clamp 2, and then the clamp 2 releases the pipe mold and opens the mold.

In another embodiment, the pipe line of the rod cavity of the mold cylinder 4 is provided with a sequence valve 67, and the pipe line of the rodless cavity of the clamp cylinder 5 is provided with a sequence valve 67, which is the same as the principle of the above embodiment, and the mold and the clamp can be opened and closed according to a specific sequence, which will not be repeated herein.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the specific features in any suitable way, and the invention will not be further described in relation to the various possible combinations in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.