A method of transfer moulding

Abstract

The present application relates to a kind of shift blank blow molding methods, left and right molds are arranged on the mould base center relative movement, and lifting loading platform is arranged below the center of left and right mold closing;Wave board conveying rail moving seat is connected with the wave board through the wave board connecting rod, and the wave board is integrated with liquid collector, GVV gravity valve, support column and built-in pipeline;The wave board is inserted into the lifting loading platform by the wave board connecting rod sent to lifting loading platform by the clamping jaw of wave board loading manipulator grabbing wave board connecting rod on moving seat;The hand end of shift blank manipulator is connected with shift blank clamping frame, two moving clamping seats are arranged on shift blank clamping frame, and the outer end of shift blank clamping rod on moving clamping seat is connected with shift blank chuck.The blow molding machine is extruded by shift blank manipulator to initial parison of extrusion die head to the center of left and right mold closing, and the wave board is sent to the wave board integrated with each component through lifting loading platform by the wave board loading manipulator clamping wave board, and the wave board and each component are integrally blow molded in initial parison, with high blow molding efficiency and quality.

Description

Technical Field

[0001] This invention relates to the field of fuel tank technology, and specifically to a method for transfer blow molding. Background Technology

[0002] With the implementation of the China VI emission standard (Phase b), the control requirements for fuel evaporation emissions have significantly increased. Traditional gasoline vehicles rely on carbon canisters to adsorb vapors, but the capacity of carbon canisters is limited. High-pressure fuel tanks, through structural reinforcement and intelligent valve linkage such as the FTIV isolation valve, achieve dynamic vapor sealing and directional emission, overcoming the bottleneck of adapting atmospheric pressure fuel tanks to hybrid vehicles. In existing high-pressure fuel tank structures, various components such as baffles, liquid collectors, and various exhaust valves and pipelines are built-in. These components are directly blow-molded and connected to the inner wall of the tank during the fuel tank blow molding process. During the blow molding operation, each component needs to be installed individually, affecting the blow molding time and efficiency. The long installation time of multiple components can easily affect the temperature of the blow-molded material and subsequent molding. At the same time, connecting multiple components to the inner wall of the high-pressure fuel tank has a significant impact on the overall thickness of the tank and the thickness and strength of the connection parts, which is not conducive to the stability of the blow molding quality of the high-pressure fuel tank. Summary of the Invention

[0003] This invention provides a convenient and high-quality transfer blow molding method.

[0004] The technical solution adopted in this invention is: a method for a transfer blow molding machine, characterized in that: the blow molding machine includes a mold base and an extrusion die head, and left and right molds are centrally opposite or back-to-back on the mold base; the mold base also has a lifting loading platform located below the mold closing center of the left and right molds, which can be pneumatically or hydraulically lifted, and the lifting loading platform is provided with loading positioning holes; it also includes a baffle plate loading device and a transfer device, the baffle plate loading device includes a baffle plate loading robot, a baffle plate conveying track and a baffle plate connecting rod, the movable seat of the baffle plate conveying track is provided with a movable positioning hole, the lower part of the baffle plate connecting rod is a positioning section, the cross section of the positioning section is fixedly inserted and non-rotating corresponding to the loading positioning hole and the movable positioning hole, and the baffle plate connecting rod is... The section is a connecting section for the integrated liquid collector, GV gravity valve, and support column of the anti-surge plate. The anti-surge plate is inserted into the gripper of the robot arm, corresponding to the clamping section in the middle of the anti-surge plate connecting rod. It is in a state of grasping the anti-surge plate connecting rod on the moving seat and sending it to the lifting loading platform and inserting it into the loading positioning hole. The blank transfer device includes a blank transfer robot arm, a blank transfer clamping frame, a movable clamping seat, a blank transfer clamping rod, and a blank transfer chuck. The hand end of the blank transfer robot arm is connected to the blank transfer clamping frame. The blank transfer clamping frame is provided with two movable clamping seats that are pneumatically guided to move in opposite or opposite directions. The movable clamping seat is vertically connected to the blank transfer clamping rod. The outer end of the blank transfer clamping rod is connected to the blank transfer chuck. The blank transfer chuck moves with the blank transfer robot arm and clamps the initial blank extruded by the extrusion die head to the left and right mold closing center or above the loading positioning hole. The blow molding method includes the following steps: (1) Initial position: The left and right molds are separated on the molding machine base, and the lifting loading platform in the middle position is lowered; (2) Loading of wave deflector: The wave deflector, which integrates liquid collector, GVV gravity valve, support column and built-in pipeline, is inserted into the corresponding through section of the wave deflector through section on the upper part of the wave deflector through section on the moving seat of the wave deflector conveying track through section corresponding to the hole on the wave deflector. The wave deflector through section moves with the moving seat to the stroke range of the wave deflector loading robot. The wave deflector robot rotates to the middle part of the wave deflector through section and clamps the clamping section in the middle part of the wave deflector through section. The positioning section at the lower part of the wave deflector through section is pulled out of the moving positioning hole of the moving seat and transferred with the wave deflector robot to the corresponding loading positioning hole above the lifting loading platform. The positioning section at the lower part of the wave deflector through section is inserted into the loading positioning hole and the wave deflector robot is reset. (3) Loading the blank: The extrusion die extrudes the initial blank, and the blank transfer robot moves the blank transfer chuck on the blank transfer clamping frame to the position of the upper opening of the initial blank. The relative movement of the moving clamping seat is controlled so that the blank transfer clamping rod drives the blank transfer chuck to center and clamp. After the rotation is controlled by the pneumatic control of the middle clamping plate on the inner side of the chuck seat of the blank transfer chuck and the rotating clamping plates on both sides, the two blank transfer chucks are centered and closed to clamp the initial blank from below the extrusion die. Combined with the vacuum suction port, the initial blank is vacuum-clamped. Under the drive of the blank transfer robot, the clamped initial blank is moved to the mold closing center position of the left and right molds, facing downwards to correspond to the anti-wave plate. (4) Mold closing: After the lifting loading platform is raised and the anti-wave plate is sent in from the bottom of the initial blank, the left and right molds are closed on the plastic molding machine base. The top columns of the left and right molds correspond to the top columns of the initial blank so that their inner walls press against the support columns of the anti-wave plate, positioning the initial blank and the anti-wave plate. At the same time, the lifting loading platform is lowered and the anti-wave plate is removed from the anti-wave plate through the through section of the anti-wave plate connecting rod and lowered. When the left and right molds are closed, the anti-wave plate through rod is completely removed. The blank transfer robot releases the clamp on the initial blank and resets. (5) Blow molding: After the left and right molds are closed, the blow molding head extends from the left or right mold to perform blow molding operation at the fuel pump assembly port position corresponding to the initial blank. After blow molding, the left and right molds are water cooled, separated, and automatically unloaded to form the high-pressure oil tank.

[0005] Furthermore, the blank transfer chuck includes a chuck seat connected to a movable clamping rod. The chuck seat has an inner clamping plate, and rotating clamping plates are respectively provided on both sides of the inner clamping plate. The rotating clamping plates are rotatably hinged to the chuck seat and are in a state of rotating around the hinge point from the outside to the inside center driven by a pneumatic push rod. Alternatively, the inner end of the rotating clamping plate is connected to a rotating cylinder fixed on the chuck seat and is in a state of rotating around the rotating cylinder from the outside to the inside center driven by the rotating cylinder. Multiple vacuum suction ports facing inward are provided on the rotating clamping plates and the inner clamping plate.

[0006] Furthermore, the blank transfer robot is provided with a blank transfer track that is vertically oriented towards the mold base, and the blank transfer robot is set on the blank transfer track via the robot track seat; in step (3), while the blank transfer robot is rotating, the robot track seat at the bottom of the blank transfer robot moves on the blank transfer track toward the mold base.

[0007] Furthermore, the blank-transferring robot is located on a different side from the mold base and the anti-surge plate loading device.

[0008] Furthermore, the lifting and lowering control of the lifting and lowering platform is linked with the mold closing control of the left and right molds on the molding machine base.

[0009] Furthermore, the mold cavities of the left and right molds are provided with top pillars corresponding to the support pillars, and the top pillars on the left and right molds are telescopic control structures in the direction of the support pillars; the mold cavity of the left or right mold is provided with a blow molding head corresponding to the fuel pump assembly port.

[0010] Furthermore, in step (3), the middle clamping plate of the two blank transfer clamps and the rotating clamping plates on both sides work together to clamp and cut the initial blank below the clamping extrusion die. After the initial blank is cut, the blank transfer clamps move outwards in opposite directions on the blank transfer clamping frame, causing the initial blank, which is compressed and contracted during the cutting, to expand outwards.

[0011] The beneficial effects of this invention are as follows: The baffle plate integrates a pre-installed liquid collector, GVV gravity valve, support column, and built-in pipelines. Positioned on the baffle plate connecting rod on the baffle plate conveying track, it moves to the baffle plate robot arm position where the robot arm grips the connecting rod and delivers it to the lifting loading platform below the center of the left and right molds for positioning. Combined with the blank transfer robot arm, the blank transfer chuck is delivered to the upper opening of the extrusion die to extrude the comfort parison. The two blank transfer chucks are aligned and clamped by the intermediate clamping plate and the rotating clamping plates on both sides. The vacuum suction ports of the intermediate and rotating clamping plates further tighten the clamping, completing the hexagonal clamping of the initial parison's upper opening. Depending on the blow molding size, the initial parison can be enlarged by tightening the blank transfer chuck. The blank transfer robot arm directly rotates to the center of the left and right molds. The initial preform is moved from above the lifting loading platform, or in conjunction with the transfer track, to the center of the left and right molds. This avoids the problem of excessive internal temperature damage to the components caused by the traditional method of directly sending the initial preform to the center of the left and right molds via the extrusion die. After being clamped, the initial preform is sent between the left and right molds, where the internal temperature is appropriately reduced. After being sent into the baffle plate, it is ensured that it is not damaged by excessive temperature, thus improving the quality of subsequent blow molding. Blow molding is completed through the positioning and clamping support column and the blow molding head through the fuel pump assembly port of the initial preform. The liquid collector, GVV gravity valve, support column and built-in pipeline integrated on the baffle plate are not integrally blow molded with the inner wall of the initial preform. This greatly reduces the uneven thickness of the inner wall caused by the connection of multiple components to the inner wall of the initial preform, thus comprehensively improving the cooling of the blow molding process. Attached Figure Description

[0012] Figure 1 This is a top view of the structure of the present invention; Figure 2 for Figure 1 Schematic diagram of the A-axis structure of the billet-moving robot; Figure 3 for Figure 1 Schematic diagram of the manipulator's B-axis structure in the wave deflector; Figure 4 This is a schematic diagram of the structure for the wave deflector connecting rod.

[0013] In the diagram: 1. Mold base; 2. Left mold; 3. Right mold; 4. Top column; 5. Blow head; 6. Lifting loading platform; 7. Loading positioning hole; 8. Anti-surge plate loading robot; 9. Gripper; 10. Anti-surge plate conveying track; 11. Moving seat; 12. Moving positioning hole; 13. Anti-surge plate connecting rod; 14. Connecting section; 15. Clamping section; 16. Positioning section; 17. Anti-surge plate; 18. Anti-surge plate connecting interface; 19. Support column; 20. Liquid collector; 21. GVV gravity valve; 22. Billet transfer robot; 23. Billet transfer clamping frame; 24. Moving clamping seat; 25. Billet transfer clamping rod; 26. Billet transfer chuck; 27. Chuck seat; 28. Intermediate clamping plate; 29. ​​Rotary cylinder; 30. Rotary clamping plate; 31. Vacuum suction head; 32. Billet transfer track; 33. Robotic arm track seat; 34. Extrusion die head. Detailed Implementation

[0014] The following explanation, in conjunction with the accompanying drawings, will provide further details.

[0015] Figure 1-4 As shown, a transfer blow molding machine includes a mold base 1, a left mold 2, a right mold 3, a lifting loading platform 6, a baffle loading robot 8, grippers 9, a baffle conveying track 10, a moving seat 11, a baffle connecting rod 13, a transfer robot 22, a transfer clamping frame 23, a moving clamping seat 24, a transfer clamping rod 25, a transfer chuck 26, a chuck seat 27, an intermediate clamping plate 28, a rotary cylinder 29, a rotary clamping plate 30, a vacuum suction head 31, a transfer track 32, a robot track seat 33, and an extrusion die head 34.

[0016] like Figure 4 As shown, the blow molding machine has a baffle plate 17 with a baffle plate through-hole 18. The baffle plate 17 is integrated with multiple pre-installed support columns 19 and is equipped with a liquid collector 20 and one or more GV gravity valves 21.

[0017] The molding machine base 1 has left and right molds 2 and 3 that move in opposite directions or towards each other. The inner cavities of the left and right molds 2 and 3 are equipped with corresponding support columns 19 and telescopic top columns 4. Each mold also has a blow molding head 5 for blow molding the fuel pump assembly port of the high-pressure fuel tank. The molding machine base 1 also has a lifting loading platform 6 located below the mold closing center of the left and right molds, which can be pneumatically or hydraulically raised and lowered. The lifting loading platform 6 has loading positioning holes 7.

[0018] A wave deflector loading robot 8 and a wave deflector conveying track 10 are installed on one side of the mold base 1. A movable positioning hole 12 is provided on the movable seat 11 of the wave deflector conveying track 10. The lower part of the wave deflector connecting rod 13 is a positioning section 16. The cross section of the positioning section 16 corresponds to the loading positioning hole 7 and the movable positioning hole 12 in a fixed insertion and non-rotational state. The upper part of the wave deflector connecting rod 13 is the connecting section 14 of the wave deflector connecting interface 18 of the integrated liquid collector, GVV gravity valve, support column and built-in pipeline of the wave deflector 17. The gripper 9 of the wave deflector loading robot 8 corresponds to the clamping section 15 in the middle of the wave deflector connecting rod 12, which is in a state of grabbing the wave deflector connecting rod on the movable seat and sending it to the lifting loading platform and inserting it into the loading positioning hole.

[0019] On the other side of the mold base 1, an extrusion die head 34 and a blank transfer track 32 are correspondingly arranged. The blank transfer track 32 is arranged perpendicular to the mold closing direction of the mold base 1. A robot arm track seat 33 is movably mounted on the blank transfer track 32. A blank transfer robot arm 22 is mounted on the robot arm track seat 33. The hand end of the blank transfer robot arm 22 is connected to a blank transfer clamping frame 23. Two movable clamping seats 24 are arranged on the blank transfer clamping frame 23, which are pneumatically guided to move in opposite or back-to-back directions. A blank transfer clamp is vertically connected to the movable clamping seat 24. The outer end of the clamping rod 25 is connected to the transfer chuck 26. The chuck seat 27 of the transfer chuck 26 is connected to the moving clamping rod 25. The chuck seat 27 is provided with an intermediate clamping plate 28 facing inward. Rotating clamping plates 30 are provided on both sides of the intermediate clamping plate 28. The inner end of the rotating clamping plate 30 is connected to a rotating cylinder 29 fixed on the chuck seat. The rotating plate 30 is driven by the rotating cylinder to rotate around the rotating cylinder from the outside to the middle of the inside. Multiple vacuum suction ports 31 facing inward are provided on the rotating clamping plate and the intermediate clamping plate.

[0020] In this embodiment, the lifting control of the lifting and turning platform is linked with the mold closing control of the left and right molds on the molding machine base.

[0021] A blow molding method using a transfer blow molding machine includes the following steps: (1) Initial position: The left and right molds 2 and 3 are separated on the plastic molding machine base 1, and the lifting loading platform 6 in the middle position is lowered; (2) Loading of wave deflector: The wave deflector 17, which integrates a liquid collector, GVV gravity valve, support column and built-in pipeline, is inserted into the through section 14 of the wave deflector through section 18 on the wave deflector 17 and set on the moving seat 11 of the wave deflector conveying track 10. The wave deflector through section 13 moves with the moving seat 11 to the stroke range of the wave deflector loading robot 8. The wave deflector robot 8 rotates to the middle of the wave deflector through section 15 in the middle of the wave deflector through section 13 by the gripper 9. The positioning section 16 at the bottom of the wave deflector through section 13 is pulled out of the moving positioning hole 12 of the moving seat 11 and transferred with the wave deflector robot 8 to the corresponding loading positioning hole 7 above the lifting loading platform 6. The positioning section 16 at the bottom of the wave deflector through section 13 is inserted into the loading positioning hole 7 and the wave deflector robot 8 is reset. (3) Loading the blank: The extrusion die 34 extrudes the initial blank, and the blank transfer robot 22 drives the blank transfer clamping frame 23 to align the blank transfer chuck 26 with the upper position of the initial blank. The moving clamping seat 24 is controlled to move relative to the blank transfer clamping rod 25 so that the blank transfer chuck 26 is centered and clamped. After the blank transfer chuck 26 is pneumatically rotated by the middle clamping plate 28 on the inner side of the chuck seat 27 and the rotating clamping plates 30 on both sides, the two blank transfer chucks are centered and closed to clamp the initial blank from below the extrusion die, and combined with the vacuum suction port 31, the initial blank is clamped. The initial preform is clamped and moved to the center of the left and right molds 2 and 3 by the transfer manipulator 22, facing downwards to the anti-sloshing plate 17. The middle clamping plate of the two transfer chucks and the rotating clamping plates on both sides work together to clamp and cut the initial preform below the extrusion die. After cutting, the transfer chucks move outwards in opposite directions on the transfer clamping frame, causing the initial preform, which was compressed during cutting, to expand outwards. Depending on the blow molding size, the initial preform can be enlarged by clamping and expanding outwards through the transfer chucks. (4) Mold closing: After the lifting loading platform 6 is raised and the anti-wave plate 17 is sent into the initial blank from the bottom, the left and right molds 2 and 3 are closed on the plastic mold base 1. The top column 4 of the left and right molds 2 and 3 corresponds to the top column of the initial blank so that its inner wall presses against the support column 18 of the anti-wave plate 17, positioning the initial blank and the anti-wave plate. At the same time, the lifting loading platform 6 is lowered and the anti-wave plate 17 is removed from the anti-wave plate 17 by the through section 14 of the anti-wave plate connecting rod 13 and lowered. When the left and right molds 2 and 3 are closed, the anti-wave plate connecting rod 13 is completely removed. The blank transfer robot 22 releases the clamp on the initial blank and resets. (5) Blow molding: After the left and right molds 2 and 3 are closed, the blow molding head 5 extends from the left or right mold to perform blow molding operation at the fuel pump assembly port position on the initial blank. After blow molding, the left and right molds are water cooled, separated, and automatically unloaded to form a high-pressure oil tank.

[0022] In this embodiment, the movement of the blank transfer robot 22 toward the mold base 1 is accomplished by the robot track seat 33 at its bottom moving on the blank transfer track 32.

[0023] In this embodiment, the lifting and lowering of the loading platform, the extension and retraction of the top column, the extension and retraction of the left and right molds, the rotation of the rotating clamping plate, and the relative or opposite movement of the moving clamping seat on the moving clamping frame are all existing technologies. Existing technologies all have similar pneumatic, electric, or screw-driven control structures, which will not be described in detail in this embodiment.

Claims

1. A method for transfer blow molding, characterized in that: The blow molding machine includes a mold base and an extrusion die head. Left and right molds are centrally located and fed to the mold base in a manner that allows them to move towards each other or away from each other. The machine is characterized by a pneumatically or hydraulically adjustable lifting and loading platform located below the mold closing center of the left and right molds, with loading and positioning holes on the platform. The machine also includes a baffle plate loading device and a blank transfer device. The baffle plate loading device comprises a baffle plate loading robot, a baffle plate conveying track, and a baffle plate connecting rod. The movable seat is equipped with a movable positioning hole. The lower part of the baffle plate through-rod is a positioning section, and the cross-section of the positioning section corresponds to the insertion and movable positioning holes in a fixed, non-rotating state. The upper part of the baffle plate through-rod is the through-section for connecting the integrated liquid collector, GVV gravity valve, support column, and built-in pipeline of the baffle plate. The gripper of the baffle plate loading robot, corresponding to the clamping section in the middle of the baffle plate through-rod, grasps the baffle plate through-rod on the movable seat, sends it to the lifting loading platform, and inserts it into the loading positioning hole. The blank transfer device includes a blank transfer robot, a blank transfer clamping frame, a movable clamping seat, a blank transfer clamping rod, and a blank transfer chuck. The hand end of the blank transfer robot is connected to the blank transfer clamping frame. The blank transfer clamping frame is equipped with two movable clamping seats that are pneumatically guided to move in opposite directions. The movable clamping seat is vertically connected to the blank transfer clamping rod. The outer end of the blank transfer clamping rod is connected to the blank transfer chuck. The blank transfer chuck moves with the blank transfer robot and clamps the initial blank extruded by the extrusion die head to the left and right die closing center or above the loading positioning hole. The blank transfer chuck includes a chuck seat connected to a movable clamping rod. The chuck seat has an inner clamping plate, and rotating clamping plates are respectively provided on both sides of the inner clamping plate. The rotating clamping plates are rotatably hinged to the chuck seat and are in a state of rotating from the outside to the inside center around the hinge point by a pneumatic push rod. Alternatively, the inner end of the rotating clamping plate is connected to a rotating cylinder fixed on the chuck seat and is in a state of rotating from the outside to the inside center around the rotating cylinder by the rotating cylinder. Multiple vacuum suction ports facing inward are provided on the rotating clamping plates and the inner clamping plate. The blow molding method includes the following steps: (1) Initial position: The left and right molds are separated on the molding machine base, and the lifting loading platform in the middle position is lowered; (2) Loading of wave deflector: The wave deflector, which integrates liquid collector, GV gravity valve and support column, is inserted into the corresponding hole on the wave deflector conveying track moving seat and the upper part of the wave deflector connecting rod is installed. The wave deflector connecting rod moves with the moving seat to the stroke range of the wave deflector loading robot. The wave deflector robot rotates to the middle of the wave deflector connecting rod and clamps the clamping section in the middle of the wave deflector connecting rod with the gripper. The positioning section of the lower part of the wave deflector connecting rod is pulled out of the moving positioning hole of the moving seat and transferred with the wave deflector robot to the corresponding loading positioning hole above the lifting loading platform. The positioning section of the lower part of the wave deflector connecting rod is inserted into the loading positioning hole and the wave deflector robot is reset. (3) Loading the blank: The extrusion die extrudes the initial blank, and the blank transfer robot moves the blank transfer chuck on the blank transfer clamping frame to the position of the upper opening of the initial blank. The relative movement of the moving clamping seat is controlled so that the blank transfer clamping rod drives the blank transfer chuck to center and clamp. After the rotation is controlled by the pneumatic control of the middle clamping plate on the inner side of the chuck seat of the blank transfer chuck and the rotating clamping plates on both sides, the two blank transfer chucks are centered and closed to clamp the initial blank from below the extrusion die. Combined with the vacuum suction port, the initial blank is vacuum-clamped. Under the drive of the blank transfer robot, the clamped initial blank is moved to the mold closing center position of the left and right molds, facing downwards to correspond to the anti-wave plate. (4) Mold closing: After the lifting loading platform is raised and the anti-wave plate is sent in from the bottom of the initial blank, the left and right molds are closed on the plastic molding machine base. The top columns of the left and right molds correspond to the top columns of the initial blank so that their inner walls press against the support columns of the anti-wave plate, positioning the initial blank and the anti-wave plate. At the same time, the lifting loading platform is lowered and the anti-wave plate is removed from the anti-wave plate through the through section of the anti-wave plate connecting rod and lowered. When the left and right molds are closed, the anti-wave plate through rod is completely removed. The blank transfer robot releases the clamp on the initial blank and resets. (5) Blow molding: After the left and right molds are closed, the blow molding head extends from the left or right mold to perform blow molding operation at the fuel pump assembly port position corresponding to the initial blank. After blow molding, the left and right molds are water cooled, separated, and automatically unloaded to form the high-pressure oil tank.

2. The method for transfer blow molding according to claim 1, characterized in that: The blank transfer robot is provided with a blank transfer track that is vertically oriented towards the mold base. The blank transfer robot is set on the blank transfer track via a robot track seat. In step (3), while the blank transfer robot is rotating, the robot track seat at the bottom of the blank transfer robot moves on the blank transfer track toward the mold base.

3. A method for transfer blow molding according to claim 1 or 2, characterized in that: The blank-transfer robot is located on a different side from the mold base and the anti-surge plate loading device.

4. The method for transfer blow molding according to claim 1, characterized in that: The lifting and turning platform is linked to the mold closing control of the left and right molds on the molding machine base.

5. The method for transfer blow molding according to claim 1, characterized in that: The left and right mold cavities are equipped with top pillars corresponding to the support pillars, and the top pillars on the left and right molds are telescopic control structures in the direction of the support pillars; the left or right mold cavity is equipped with a blow molding head corresponding to the fuel pump assembly port.

6. The method for transfer blow molding according to claim 1, characterized in that: In step (3), the middle clamping plate of the two blank transfer chucks and the rotating clamping plates on both sides work together to clamp and cut the initial blank below the extrusion die. After the initial blank is cut, the blank transfer chucks move outwards in opposite directions on the blank transfer clamping frame, causing the initial blank, which was compressed and contracted during the cutting, to expand outwards.

Images