阅读说明：本技术 一种摩托车前减震器空心铝筒亚压铸浇注机 (Sub-die-casting machine for hollow aluminum cylinder of front shock absorber of motorcycle ) 是由 先心安 于 2021-07-20 设计创作，主要内容包括：本发明公开了一种摩托车前减震器空心铝筒亚压铸浇注机,通过底注式浇注配合可上下移动的抽芯系统,实现芯棒在模具内的自由上下运动完成抽芯及复位操作；通过可上下移动的压注油缸的活塞对压室内的铝液进行缓慢推动,从而实现底注式浇筑并配合芯棒模具的成型操作,提高了浇筑效率的同时极大地提高了出品率,并且减少了材料的浪费；通过釆用PLC程序控制半自动生产,一名操作员可同时操作3～4台浇注机,生产率比目前行业水平高近1倍,大大降低浇注生产成本；模具采用球铁模框镶嵌H13模芯,模芯外形尺寸考虑了不同长度不同外形铝筒坯件型腔占位需要,换型号铝筒坯件浇注时只需拆换模芯,生产调整方便快捷,具有较好的经济效益及十分显著的技术进步,便于大规模生产。(The invention discloses a hollow aluminum cylinder sub-die casting machine for a front shock absorber of a motorcycle, which is characterized in that core pulling and resetting operations are completed by the free up-and-down movement of a core rod in a die through the cooperation of bottom pouring type casting and a core pulling system capable of moving up and down; the piston of the injection cylinder capable of moving up and down slowly pushes the aluminum liquid in the pressure chamber, so that bottom injection type pouring is realized and the molding operation of the mandrel mold is matched, the pouring efficiency is improved, the yield is greatly improved, and the waste of materials is reduced; by adopting a PLC program to control semi-automatic production, an operator can simultaneously operate 3-4 casting machines, the production rate is nearly 1 time higher than that of the current industry level, and the casting production cost is greatly reduced; the H13 mold core is embedded in the mold through the ductile iron mold frame, the occupying requirement of the mold cavities of the aluminum barrel blank with different lengths and shapes is considered by the overall dimension of the mold core, the mold core is only required to be disassembled and replaced when the aluminum barrel blank with the replaced model is poured, the production and adjustment are convenient and fast, the good economic benefit and the very obvious technical progress are realized, and the large-scale production is facilitated.)

1. A motorcycle front shock absorber hollow aluminum cylinder sub-die casting machine comprises a main body structure consisting of a bottom plate (1), a group of side supporting plates (2), a core sleeve mounting plate (6) and a steel plate welding bracket (30); the casting machine is characterized in that the side vertical bearing plates (2) are fixedly connected to the left end and the right end of the upper surface of the bottom plate (1), the top ends of the side vertical bearing plates (2) are fixedly connected with the two ends of the lower surface of the core sleeve mounting plate (6) to form a rigid structure, and the bottom plate (1) is fixedly connected with the top ends of the steel plate welding supports (30) to form a rigid supporting structure of the casting machine; the mold opening and closing oil cylinders (3) are arranged on the outer side surfaces of the side vertical supporting plates (2) on the left side and the right side, piston rods of the mold opening and closing oil cylinders (3) transversely penetrate through the side vertical supporting plates (2) and then are fixedly connected with the outer side wall of the mold mounting plate (7) through piston rod connecting pieces (20), split molds (19) are arranged on the inner side wall of the mold mounting plate (7), and the split molds (19) on the mold mounting plate (7) are driven to complete mold opening and mold closing actions under the action of the mold opening and closing oil cylinders (3); a pouring gate is arranged at the bottom of the split type mold (19), and a pressure chamber (21) is arranged on the bottom plate (1) corresponding to the pouring gate; the top end of a core rod (18) is fixedly connected with one end of a core rod connecting rod (16), the other end of the core rod connecting rod (16) is fixed on a core pulling sliding plate (9), the core pulling sliding plate (9) reciprocates in the vertical direction under the action of a core pulling oil cylinder (13) arranged on a core pulling oil cylinder support, the core rod (18) and a core sleeve (17) fixed on the lower surface of a core sleeve mounting plate (6) form a small-gap sliding linear motion pair, and the core pulling sliding plate (9) drives the core rod (18) to move up and down in the core sleeve (17) under the action of the core pulling oil cylinder (13) so as to realize core pulling part taking and core inserting resetting; the steel plate welding device is characterized by further comprising a pressure injection oil cylinder lifting support (28) arranged in the steel plate welding support (30), wherein a pressure injection oil cylinder (23) is arranged at the top of the pressure injection oil cylinder lifting support (28), a pressure injection piston (22) is arranged at the top end of a piston rod of the pressure injection oil cylinder (23) through a piston rod connecting piece (20), and the pressure injection piston (22) and the pressure chamber (21) form a small-gap sliding linear motion pair; the split type die (19) is divided into a left die and a right die, and the left die and the right die after die assembly and the reset core rod (18) form an aluminum cylinder blank forming cavity.

2. The hollow aluminum cylinder sub-die-casting machine for the front shock absorber of the motorcycle according to claim 1, wherein the core-pulling oil cylinder support comprises four vertically arranged core-pulling guide pillars (14), the core-pulling guide pillars (14) form a small-gap sliding linear motion pair with the core-pulling sliding plate (9) through core-pulling guide sleeves (15), the core-pulling guide pillars (14) are fixedly connected to a core sleeve mounting plate (6), the core-pulling oil cylinder mounting plate (10) is fixedly mounted at the top ends of the four core-pulling guide pillars (14), and the core-pulling oil cylinder (13) is fixedly mounted on the core-pulling oil cylinder mounting plate (10).

3. The hollow aluminum cylinder sub-die-casting machine for the front shock absorber of the motorcycle according to claim 2, further comprising a core-pulling shoulder plate (11), wherein the core-pulling shoulder plate (11) is horizontally arranged on a piston rod of the core-pulling oil cylinder (13), a rigid frame is formed by the four core-pulling pull rods (12) and the core-pulling sliding plate (9), and the core-pulling sliding plate (9) is driven to slide under the action of the core-pulling oil cylinder (13).

4. The hollow aluminum cylinder sub-die-casting machine for the front shock absorber of the motorcycle as claimed in claim 1, wherein the injection cylinder lifting support (28) is arranged at the bottom of the steel plate welding support (30); the device comprises four vertically arranged lifting support rods of a pressure injection oil cylinder, an upper transverse plate and a lower transverse plate which are connected into a whole are slidably sleeved on the lifting support rods of the pressure injection oil cylinder, and a rotatable lifting screw (27) of the pressure injection oil cylinder is arranged between the lifting support rods of the pressure injection oil cylinder; the lower transverse plate is provided with a through hole, a pressure injection oil cylinder lifting nut (26) is arranged in the through hole, a pressure injection oil cylinder lifting screw rod (27) and the pressure injection oil cylinder lifting nut (26) form a screw pair, and the pressure injection oil cylinder (23) is arranged on the upper surface of the upper transverse plate.

5. The motorcycle front shock absorber hollow aluminum cylinder sub-die-casting machine according to claim 4, further comprising a lifting handle (24) arranged at the bottom of the lifting screw (27) of the pressure injection oil cylinder.

6. The sub die-casting machine for the hollow aluminum cylinder of the front shock absorber of the motorcycle as claimed in claim 1, wherein a mold electric heating tube (32) is provided inside the split mold (19), a pressure chamber electric heating tube (31) is provided inside the pressure chamber (21), and a mandrel electric heating tube (8) is provided inside the core sleeve (17).

7. The motorcycle front shock absorber hollow aluminum cylinder sub-die casting machine according to claim 1, characterized in that four horizontally arranged open-close die guide posts (4) are further arranged at the periphery of the die mounting (7), and the open-close die guide posts (4) and the side standing support plate (2) form a small-gap sliding linear motion pair.

8. The motorcycle front shock absorber hollow aluminum cylinder sub-die casting machine according to claim 7, characterized in that an open-close die guide sleeve (5) transversely penetrating through the side vertical support plate (2) is further arranged on the side vertical support plate (2), and the open-close die guide post (4) and the open-close die guide sleeve (5) form a small-gap sliding linear motion pair.

Technical Field

The invention relates to the field of casting forming, in particular to a hollow aluminum cylinder sub-die casting machine for a front shock absorber of a motorcycle.

Background

The aluminum cylinder is a key part of a front shock absorber of a motorcycle, is a shock absorption performance structural part and a safety guarantee main body part, and has the main quality requirements that the cylinder body does not leak shock absorption oil, the axial tensile strength and the radial bending strength reach or even exceed product design indexes, the surface polishing of the cylinder body does not allow hole defects such as air holes, slag holes, concentrated shrinkage holes and concentrated pinholes, the surface roughness of an inner hole of an oil cylinder section reaches about Ra0.15 after finish machining, and the appearance is attractive, namely, a pouring gate is not opened at best on the full-length parting surface of the cylinder body. The material of the aluminum cylinder is ZL107 or AC 2B.

At present, metal gravity pouring is generally adopted for casting aluminum cylinder blanks in the industry, and the metal gravity pouring is divided into a hollow pouring process and a solid pouring process, so that the process yield is low (close to 50 percent), and the following main defects also exist:

1. hollow casting: aluminum liquid enters from a straight pouring channel through a cross pouring channel, namely a vertical cylinder, from an inner pouring gate on the side surface of the cylinder body in a segmented mode, the flow path is long, the pouring channel resistance is large, the filling and feeding capacity is poor, the casting forming qualification rate of the aluminum cylinder with more side lugs is not high, a hot spot and nearby tissues are loose, after polishing, concentrated shrinkage cavities and concentrated pinholes are easy to appear, and after a seepage pressure test cannot be started, and the aluminum cylinder is easy to foam after paint baking; when in casting, aluminum liquid needs to pass through at least three right-angle turns to generate splashing, turbulence and entrainment gas, so that a blank matrix generates gas (slag) holes; the pouring position of the aluminum cylinder is that the large end of the thin wall is arranged below, the thick and large heat node at the tail end is arranged above, the temperature of a pouring tail end aluminum liquid pressure head is small and is greatly reduced, and the filling and feeding capacity of the thick and large heat node at the tail end of the blank is limited, so that the tail end pressure test and air leakage are caused after the inner hole of part of the blank is processed; the temperature of the mould depends on the heat transfer and natural heat dissipation of the aluminum liquid, the blank is slow in condensation and shaping, the production beat is long, and the method is particularly suitable for solid pouring; sawing a plurality of sections of ingates arranged in the length direction of the parting surface of the aluminum cylinder body is troublesome, material loss caused by the sawing bulge residue of the ingates is eliminated, and after polishing of part of ingates of the blank and the part near the ingates, concentrated shrinkage cavities exist; the use of the metal mold release agent has high requirements on the skill of split-die operators, the coating blending, the spraying position, the spraying thickness, the spraying distance and the blockage of the exhaust gap by the coating can influence the casting forming qualification rate, and the coating is sprayed after sand washing and large cleaning are carried out on the mold coating in each casting shift, so that dust flies to pollute the environment; the hollow pouring of the big end of the bottom barrel above is only slightly good for filling and feeding of the thick big thermal node at the tail end, and the other defects are the same as the above.

2. Solid pouring: the pouring position of the aluminum barrel is that the large end is above, the tail end is below, the aluminum liquid is poured from a pouring cup at the top of the large end, the pouring cup is large and long, the aluminum liquid is occupied more, meanwhile, the pouring and the tilting mold are poured, the filling and forming capacity is slightly stronger than that of hollow pouring, but for the aluminum barrel with more side lugs and complex appearance, the blank forming qualification rate is not high due to convection of descending high-temperature aluminum liquid and ascending hot air, the exhaust of a cavity is not smooth, filling air resistance is generated, shrinkage cracks are easily generated at the connection transition part of the side lugs and the barrel body, and the surface polishing quality of a hot spot and the nearby surface is similar to that of hollow pouring; the use of the release agent is the same as that of hollow casting, and the same problem also exists; the solid aluminum cylinder needs to roughly drill an inner hole and then finely bore and ream the inner hole, the cutting and machining performance is poor, and the surface roughness of the inner hole of the oil cylinder section is not easy to guarantee; the re-melting loss of the sheet aluminum scraps after rough drilling is large, generally about 12%, and the weight of the rough drilling aluminum scraps and the casting head is larger than that of a hollow blank, so that a large amount of aluminum materials are wasted; the surface of the solid pouring aluminum cylinder has heavier oxidation flow marks, the forming surface is rough, and the polishing treatment workload before paint baking is large.

No matter hollow casting or solid casting, because only rely on gravity to fill the die cavity, so the casting aluminium liquid temperature is not less than 730 degrees at least, the aluminium liquid casting temperature of the aluminium cylinder with complicated shape is higher, the aluminium liquid absorbs hydrogen heavily, must adopt the nitrogen gas mode of continuous jetting to remove hydrogen, and difficult to remove completely, lead to casting the aluminium cylinder to produce the defect of gas pocket inevitably.

In conclusion, in the prior industry, no matter hollow pouring or solid pouring, the casting of aluminum cylinder blanks is in the laggard passive situation that the pouring quality is not high and unstable, the material loss is large, the subsequent processing is complicated, the production rate is low, the labor intensity is high, the production cost is high, and the environmental pollution is large. The localization of the front shock absorber of the motorcycle has been over twenty years, and the casting production of the aluminum cylinder is always the bottleneck of the manufacturing quality of the front shock absorber of the motorcycle in the top grade and the production scale.

Disclosure of Invention

The invention aims to solve the technical problems of low and unstable casting quality, large material loss, low production efficiency, high labor intensity, high and constant production cost and large environmental pollution in the existing pouring and forming process of the hollow aluminum cylinder blank of the front shock absorber of the motorcycle.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a motorcycle front shock absorber hollow aluminum cylinder sub-die casting machine comprises a main body structure consisting of a bottom plate, a group of side supporting plates, a core sleeve mounting plate and a steel plate welding bracket; the side vertical bearing plates are fixedly connected to the left end and the right end of the upper surface of the bottom plate, the top ends of the side vertical bearing plates and the two ends of the lower surface of the core sleeve mounting plate are fixedly connected to form a rigid structure, and the bottom plate and the top end of the steel plate welding support are fixedly connected to form a rigid support structure of the casting machine; the outer side surfaces of the side vertical supporting plates on the left side and the right side are provided with mold opening and closing oil cylinders, piston rods of the mold opening and closing oil cylinders transversely penetrate through the side vertical supporting plates and then are fixedly connected with the outer side wall of the mold mounting plate through piston rod connecting pieces, split molds are arranged on the inner side wall of the mold mounting plate, and the split molds on the mold mounting plate are driven to complete mold opening and mold closing actions under the action of the mold opening and closing oil cylinders; a pouring gate is arranged at the bottom of the split type mold, and a pressure chamber is arranged on the bottom plate corresponding to the pouring gate; the top end of the core rod is fixedly connected with one end of a core rod connecting rod, the other end of the core rod connecting rod is fixed on a core pulling sliding plate, the core pulling sliding plate reciprocates in the vertical direction under the action of a core pulling oil cylinder arranged on a core pulling oil cylinder support, the core rod and a core sleeve fixed on the lower surface of a core sleeve mounting plate form a small-gap sliding linear motion pair, and the core pulling sliding plate drives the core rod to move up and down in the core sleeve under the action of the core pulling oil cylinder so as to realize core pulling part taking and core inserting resetting; the device also comprises a pressure injection oil cylinder lifting support arranged in the steel plate welding support, wherein a pressure injection oil cylinder is arranged at the top of the pressure injection oil cylinder lifting support, a pressure injection piston is arranged at the top end of a piston rod of the pressure injection oil cylinder through a piston rod connecting piece, and the pressure injection piston and the pressure chamber form a small-gap sliding linear motion pair; the split type die is divided into a left die and a right die, and the left die and the right die after die assembly and the reset core rod form an aluminum cylinder blank forming cavity.

The core-pulling oil cylinder support comprises four vertically arranged core-pulling guide pillars, the core-pulling guide pillars form a small-gap sliding linear motion pair with the core-pulling sliding plate through the core-pulling guide sleeves, the core-pulling guide pillars are fixedly connected onto the core sleeve mounting plate, the core-pulling oil cylinder mounting plate is fixedly mounted at the top ends of the four core-pulling guide pillars, and the core-pulling oil cylinder is fixedly mounted on the core-pulling oil cylinder mounting plate.

The core pulling oil cylinder is characterized by further comprising a core pulling shoulder plate, wherein the core pulling shoulder plate is horizontally arranged on a piston rod of the core pulling oil cylinder, a rigid frame is formed by the four core pulling pull rods and the core pulling sliding plate, and the core pulling sliding plate is driven to slide under the action of the core pulling oil cylinder.

Particularly, the lifting support of the pressure injection oil cylinder is arranged at the bottom of the steel plate welding support; the device comprises four vertically arranged lifting support rods of the injection cylinder, an upper transverse plate and a lower transverse plate which are connected into a whole are slidably sleeved on the lifting support rods of the injection cylinder, and a rotatable lifting screw rod of the injection cylinder is arranged between the lifting support rods of the injection cylinder; the lower transverse plate is provided with a through hole, a pressure injection oil cylinder lifting nut is arranged in the through hole, a pressure injection oil cylinder lifting screw and the pressure injection oil cylinder lifting nut form a screw pair, and the pressure injection oil cylinder is arranged on the upper surface of the upper transverse plate.

Furthermore, the device also comprises a lifting handle arranged at the bottom of the lifting screw rod of the pressure injection oil cylinder.

Particularly, a mold electric heating pipe is arranged in the split mold, a pressure chamber electric heating pipe is arranged in the pressure chamber, and a core rod electric heating pipe is arranged in the core sleeve.

Particularly, four horizontally arranged opening and closing die guide posts are further arranged on the periphery of the die mounting plate, and the opening and closing die guide posts and the side vertical supporting plate form a small-gap sliding linear motion pair.

Furthermore, an opening-closing die guide sleeve transversely penetrating through the side vertical supporting plate is further arranged on the side vertical supporting plate, and the opening-closing die guide post and the opening-closing die guide sleeve form a small-gap sliding linear motion pair.

Compared with the prior art, the invention has the following advantages and beneficial effects: the bottom pouring type pouring method which applies proper thrust and push speed to the aluminum liquid can completely ensure the quality requirements of the inside and the outside of the aluminum cylinder, has less aluminum material loss, small environmental pollution and simple subsequent processing, adopts a PLC program to control semi-automatic production, can operate 3-4 machines by one person, has the production rate which is nearly 1 time higher than the level of the current industry, and greatly reduces the pouring production cost; the H13 mold core is embedded in the mold through the ductile iron mold frame, the occupying requirement of the mold cavities of the aluminum cylinder blanks with different lengths and different shapes is considered by the overall dimension of the mold core, the mold core only needs to be detached and replaced when the aluminum cylinder blanks with different shapes are poured, the production and adjustment are convenient and fast, mass large-scale production can be completely organized, the passive situation that the original aluminum cylinder metal gravity pouring falls behind can be thoroughly changed, and the manufacturing of the front shock absorber in the motorcycle industry of China is led to step on a brand-new step.

Drawings

Fig. 1 is a schematic structural diagram of the principle of the present invention.

Fig. 2 is an enlarged schematic view of a portion a in fig. 1.

The explanation of each reference number in the figure is: 1-a bottom plate; 2-side standing support plate; 3, opening and closing the mold oil cylinder; 4, opening and closing a die guide post; 5, opening and closing a die guide sleeve; 6-core sleeve mounting plate; 7, mounting a die; 8-a core rod electric heating pipe; 9, a core pulling sliding plate; 10-core pulling oil cylinder mounting plate; 11-core pulling shoulder plate; 12-a core pulling pull rod; 13-core pulling oil cylinder; 14-core-pulling guide post; 15-core-pulling guide sleeve; 16-a mandrel connecting rod; 17-core sleeve; 18-a core rod; 19-split mold; 20-a piston rod connection; 21-pressure chamber; 22-injection piston; 23-pressing and injecting the oil cylinder; 24-a lifting handle; 25-pressing a ring; 26-pressing and injecting a lifting nut of an oil cylinder; 27-lifting screw of injection cylinder; 28-pressing and injecting the oil cylinder lifting support; 29-injection piston connecting rod; 30-steel plate welding bracket; 31-pressing electric heating tube; 32-die electrical heating tube.

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, so as to further understand the concept, the technical problems solved, the technical features constituting the technical solutions, and the technical effects brought by the technical solutions.

As shown in fig. 1 and 2, the hollow aluminum cylinder sub-die casting machine for the front shock absorber of the motorcycle comprises a main body structure consisting of a bottom plate 1, a group of side supporting plates 2, a core sleeve mounting plate 6 and a steel plate welding bracket 30; the side vertical bearing plates 2 are fixedly connected to the left end and the right end of the upper surface of the bottom plate 1, the top ends of the side vertical bearing plates 2 are fixedly connected with the two ends of the lower surface of the core sleeve mounting plate 6 to form a rigid structure, and the bottom plate 1 is fixedly connected with the top ends of the steel plate welding supports 30 to form a rigid support structure of the casting machine; the outer side surfaces of the side vertical supporting plates 2 on the left side and the right side are provided with mold opening and closing oil cylinders 3, piston rods of the mold opening and closing oil cylinders 3 transversely penetrate through the side vertical supporting plates 2 and then are fixedly connected with the outer side wall of the mold mounting plate 7 through piston rod connecting pieces 20, the inner side wall of the mold mounting plate 7 is provided with split molds 19, and the split molds 19 on the mold mounting plate 7 are driven to complete mold opening and closing actions under the action of the mold opening and closing oil cylinders 3; a pouring gate is arranged at the bottom of the split type mold 19, and a pressure chamber 21 is arranged on the bottom plate 1 corresponding to the pouring gate; the top end of a core rod 18 is fixedly connected with one end of a core rod connecting rod 16, the other end of the core rod connecting rod 16 is fixed on a core-pulling sliding plate 9, the core-pulling sliding plate 9 reciprocates in the vertical direction under the action of a core-pulling oil cylinder 13 arranged on a core-pulling oil cylinder support, the core rod 18 and a core sleeve 17 fixed on the lower surface of a core sleeve mounting plate 6 form a small-gap sliding linear motion pair, and the core-pulling sliding plate 9 drives the core rod 18 to move up and down in the core sleeve 17 under the action of the core-pulling oil cylinder 13 so as to realize core-pulling part taking and core-inserting resetting; the steel plate welding device is characterized by further comprising a pressure injection oil cylinder lifting support 28 arranged in the steel plate welding support 30, wherein a pressure injection oil cylinder 23 is arranged at the top of the pressure injection oil cylinder lifting support 28, a pressure injection piston 22 is arranged at the top end of a piston rod of the pressure injection oil cylinder 23 through a piston rod connecting piece 20, and the pressure injection piston 22 and the pressure chamber 21 form a small-gap sliding linear motion pair; the split type die 19 is divided into a left die and a right die, and the left die and the right die after die assembly and the reset core rod 18 form an aluminum cylinder blank forming cavity.

As a preferred embodiment, the core-pulling oil cylinder support includes four vertically arranged core-pulling guide pillars 14, the core-pulling guide pillars 14 form a small-gap sliding linear motion pair with the core-pulling sliding plate 9 through the core-pulling guide sleeves 15, the core-pulling guide pillars 14 are fixedly connected to the core sleeve mounting plate 6, the core-pulling oil cylinder mounting plate 10 is fixedly mounted on the top ends of the four core-pulling guide pillars 14, and the core-pulling oil cylinder 13 is fixedly mounted on the core-pulling oil cylinder mounting plate 10.

As a further embodiment, the core pulling device further comprises a core pulling shoulder plate 11, wherein the core pulling shoulder plate 11 is horizontally arranged on a piston rod of the core pulling oil cylinder 13, a rigid frame is formed by the four core pulling pull rods 12 and the core pulling sliding plate 9, and the core pulling sliding plate 9 is driven to slide under the action of the core pulling oil cylinder 13.

As a preferred embodiment, the pressure injection cylinder lifting bracket 28 is arranged at the bottom of the steel plate welding bracket 30; the device comprises four vertically arranged lifting support rods of a pressure injection oil cylinder, an upper transverse plate and a lower transverse plate which are connected into a whole are slidably sleeved on the lifting support rods of the pressure injection oil cylinder, and a rotatable lifting screw 27 of the pressure injection oil cylinder is arranged between the lifting support rods of the pressure injection oil cylinder; the lower transverse plate is provided with a through hole, a pressure injection oil cylinder lifting nut 26 is arranged in the through hole, a pressure injection oil cylinder lifting screw 27 and the pressure injection oil cylinder lifting nut 26 form a screw pair, and the pressure injection oil cylinder 23 is arranged on the upper surface of the upper transverse plate. According to the weight of aluminum barrel blanks with different specifications, the initial height of a pressure injection piston 26 in a pressure chamber 25, namely the depth of aluminum liquid in the pressure chamber 21, is adjusted by rotating a pressure injection oil cylinder lifting screw 27, the pressure chamber 21 is fully filled during each pouring, quantitative pouring is realized, the yield of the aluminum barrel blank pouring process reaches 85-90%, and the device is also suitable for pouring the aluminum barrel blanks with different specifications.

As a preferred embodiment, the lifting handle 24 is arranged at the bottom of the lifting screw 27 of the injection cylinder.

As a preferred embodiment, a mold electric heating pipe 32 is arranged inside the split mold 19, a pressure chamber electric heating pipe 31 is arranged inside the pressure chamber 21, and a mandrel electric heating pipe 8 is arranged inside the core sleeve 17; the pressure chamber electric heating pipes 31 are uniformly distributed and arranged on the wall thickness circumference of the pressure chamber 21 and are automatically controlled at the constant temperature of about 450 ℃ so as to ensure that the filling capacity of the aluminum liquid from pouring into the pressure chamber 21 to mold closing and pressure injection is not reduced; the mold electric heating pipe 32 is arranged in the back mold body of the cavity of the split type mold 19 for heating, the core rod electric heating pipes 8 are uniformly distributed on the wall thickness circumference of the core sleeve 18, the temperature of the split type mold 19 is quickly improved after electrification, the process of baking the mold by using a spray gun or ladling out molten aluminum to scald the mold is omitted, the cold mold is started to enter normal casting production time, the automatic constant temperature control is carried out at the set temperature, the equal casting and filling forming conditions of each mold are ensured, and the percent of pass of the casting process is improved.

In a preferred embodiment, four horizontally arranged mold opening and closing guide posts 4 are further arranged on the periphery of the mold mounting 7, and the mold opening and closing guide posts 4 and the side standing support plate 2 form a small-gap sliding linear motion pair. The opening and closing guide post 4 is used for stabilizing the stability of the die mounting plate 7 in the die opening and closing process, and preventing the split die 35 from deflecting in the die closing process to influence the die closing quality.

As a further embodiment, an opening-closing die guide sleeve 5 transversely penetrating through the side vertical support plate 2 is further arranged on the side vertical support plate 2, and a small-gap sliding linear motion pair is formed by the opening-closing die guide post 4 and the opening-closing die guide sleeve 5.

In the casting process, the casting position of a hollow aluminum cylinder blank is determined to be that the large end of a thin wall is upward, the thick hot spot at the tail end is below, the most ideal bottom casting type casting of an aluminum alloy casting is adopted, aluminum liquid is fed from a pouring gate at the tail end face of the aluminum cylinder and flows vertically upwards to fill a cavity, so that the aluminum liquid is discharged out of the aluminum cylinder cavity from bottom to top, all porous parts of the aluminum cylinder are cast with proper pre-holes, the machining allowance is 0.5-1.2, and the inner hole cutting machining performance is improved to the maximum extent; the full-length parting surface of the cylinder body is not provided with the inner sprue, so that the appearance of the aluminum cylinder is attractive, the material loss is saved to the maximum extent, and the clean casting production of the aluminum cylinder is realized. An aluminum liquid pressure chamber 21 is arranged at the bottom of the split type mold 19, aluminum liquid is pushed by a pressure injection piston 22 at the bottom of the pressure chamber 21 to vertically and upwards inject into an aluminum cylinder cavity through a pouring gate on the tail end face of the aluminum cylinder, the pushing force and the pushing speed are based on that the aluminum liquid does not generate jet air entrainment and splash slagging when passing through the pouring gate, namely the aluminum cylinder cavity is filled in a laminar flow state, the filling and forming capacity of the aluminum cylinder cavity is greatly higher than that of common metal gravity casting, and pressure maintaining is carried out at the filling tail end to ensure that the matrix tissue of the aluminum cylinder is compact; the pouring temperature of the aluminum liquid is kept constant at 670-690 ℃, the temperature is 40-50 ℃ lower than that of metal gravity pouring, the fuel consumption is reduced, the aluminum material burning loss is reduced, the environmental temperature is reduced, the service life of the smelting furnace is prolonged, the hydrogen absorption of the aluminum liquid is reduced as much as possible, the defects of air holes and slag holes generated in the pouring of aluminum cylinder blanks are prevented, and the continuous blowing of nitrogen for degassing is not needed; the release agent does not need to have heat preservation performance and is changed into a high-temperature-resistant die-casting release agent, and the continuous production does not need to carry out sand washing treatment on the die cavity coating, so that the production efficiency is improved, and the production environment is greatly improved; the height of the pressure injection piston 22 in the pressure chamber 21 is adjusted according to the weight of aluminum barrel blanks with different specifications, water is ladled out for quantitative pouring, the pouring stub bar of the aluminum barrel blanks is small and is positioned on the end surface of the tail part of the barrel body, a band saw is convenient to use for group saw cutting, the cutting scrap is less, and the material loss is small; the casting machine has two parts in one mold, and the left and right aluminum cylinders are matched to facilitate the organization, matching, casting, production and supply.

When the aluminum cylinder blank is subjected to pressure injection molding and condensation setting, the mold is opened under the action of the mold opening and closing oil cylinders 3 at the left side and the right side, the core rod 19, the aluminum cylinder blank and a stub bar connected to the tail end of the aluminum cylinder and sunk in the pressure chamber 21 form a demolding support together, the aluminum cylinder blank is prevented from being scratched and rotated during mold opening, and the aluminum cylinder blank is ensured to be demolded smoothly; after the mold is opened and the mold is demolded, the core-pulling sliding plate 9 is driven to start core-pulling action under the action of the core-pulling oil cylinder 13, the aluminum cylinder blank moves upwards along with the core rod 18 for a section of core-pulling idle stroke, a stub bar sunken at the top end of the pressure chamber 21 is pulled out and lifted to exceed the upper end surface of the pressure chamber 21, the large end surface of the aluminum cylinder blank contacts the lower end surface of the core sleeve 17, the core-pulling whole process is continuously completed, and the core rod 18 is separated from the aluminum cylinder blank to clamp the aluminum cylinder blank.

The cylinder diameter of the pressure injection oil cylinder 23 is 80mm, the nominal pressure of an independent hydraulic station is 0-10 MPa, stepless adjustment is achieved, the output flow of hydraulic oil is also stepless adjustment, and the pushing force and the pushing speed of the pressure injection piston 22 on the aluminum liquid can be conveniently adjusted according to the length and the appearance complexity of the aluminum cylinder blank. The cylinder diameters of the mold opening and closing oil cylinder 3 and the core pulling oil cylinder 13 are 125mm, the nominal pressure of a common hydraulic station is 0-16 MPa, the normal work is regulated at 10MPa, the arrangement of a hydraulic pipeline needs to ensure that the extension speed of piston rods of the mold opening and closing oil cylinder and the core pulling oil cylinder is 200 mm/4-6 seconds, so that the time for inserting the core and closing the mold after the molten aluminum is poured into a pressure chamber is shortened, and the excessive cooling and attenuation filling capacity of the molten aluminum is prevented.

The technical scheme of the invention has the advantages of metal mold gravity casting, pressure casting and low-pressure casting: the metal gravity casting has the advantages of high mechanical property, strong filling capacity of pressure casting molten aluminum, strong filling and forming capacity of low-pressure casting molten aluminum, compact casting matrix structure, difficult generation of subcutaneous air holes in the casting and abandonment of respective defects: the metal gravity casting aluminum liquid filling feeding capacity is poor, the pressure casting mechanical performance is not high, the casting is easy to generate subcutaneous air holes, the low-pressure casting production cost is high, the production efficiency is low, the aluminum liquid is easy to increase iron and reduce the casting mechanical performance, the innovative optimization design of a casting machine is adopted, bottom pouring type casting which applies proper thrust and push speed to the aluminum liquid is matched and greatly improves the filling forming capacity, the aluminum liquid casting temperature is greatly reduced, hydrogen absorption of the aluminum liquid is reduced, ladling water is quantitatively cast, a pressure chamber 21 and a split type mold 19 are adopted, the core rod 18 adopts electric heating automatic constant temperature control, measures such as a die casting mold release agent and the like are adopted, the obtained base body tissue is ensured to be compact, the forming is complete and full, the surface is smooth, the subsequent machining is less in cutting, the surface polishing is less in hole-free defect, and the hollow aluminum cylinder blank is completely purified and environment-friendly to the greatest extent.

After the pouring operator scoops the molten aluminum and fills the pressure chamber, the operator pedals a core-pulling reset control button to start a PLC semi-automatic program of the pouring machine: the method comprises the following steps of resetting a core rod 18, automatically closing and locking a mold, automatically performing pressure injection filling forming and maintaining pressure, automatically keeping the temperature of the mold and the core rod constant, automatically timing blank condensation and setting, automatically opening the mold, automatically pulling the core, manually taking a piece, arranging the mold and spraying a die-casting release agent, and then entering the next casting cycle, wherein 3-4 casting machines can be operated by one person, the time for one cycle is about two minutes, and the cycle is shortened by about 20% compared with that of metal gravity casting. Compared with the prior art, the invention has the advantages that the main factors of aluminum liquid temperature, aluminum liquid hydrogen content, mold temperature, filling and feeding capacity, cavity exhaust, mold release agent use, production rhythm and the like which influence the pouring quality of the aluminum barrel blank are all accurately and correspondingly arranged by adopting quantification means, all uncertain factors of metal mold gravity casting, pressure casting and low-pressure casting are changed into definite factors, the fluctuation of the pouring quality of the aluminum barrel blank caused by artificial operation factors is avoided, the main quality requirement of the aluminum barrel blank can be completely ensured and has high stability, the influence of the artificial factors on the aluminum barrel blank is reduced, the production cost is low, the production rate is high, the single-shift yield is about doubled, the labor intensity is low, the environmental pollution is small, the initial design of the pouring machine is general equipment, the same pouring machine can pour aluminum barrels with different lengths and different shapes, the mold is embedded with an H13 steel mold core by a ductile iron mold frame, the shape and the size of the mold core takes the needs of aluminum barrel cavities with different lengths and shapes into consideration, the mold core is only required to be disassembled and replaced when the model-changed aluminum cylinder is poured, the production and adjustment are convenient and rapid, mass and large-scale production can be completely organized, the backward passive situation of metal gravity pouring of the original aluminum cylinder is thoroughly changed, and the manufacturing of the front shock absorber in the motorcycle industry of China is led to step forward to a brand-new step. The terms "connected" and "fixed" in the description of the present invention may be fixed, formed, welded, or mechanically connected, and the specific meaning of the above terms in the present invention is understood.

In the description of the present invention, the terms "center", "upper", "lower", "horizontal", "inner", "outer", etc. are used in the orientation or positional relationship indicated only for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element referred to must have a particular orientation and therefore should not be construed as limiting the present invention.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, those skilled in the art will appreciate that; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.