A stamping device and processing technology for stamping parts

Abstract

The present invention discloses a stamping device and processing technology for stamping parts, which relates to the field of stamping processing technology, including a stamping mechanism for controlling the stamping stroke; further comprising a buffer oil cylinder, a piston rod and a limiting ring, wherein the inside of the buffer oil cylinder is processed with a primary buffer chamber and a secondary buffer chamber with gradually increasing diameters from the piston mouth upwards; the piston rod is sealingly and slidingly connected to the piston mouth, a piston head is fixed to the top end of the piston rod, and a stamping plate is fixed to the bottom end; a primary spring is sleeved on the outer side of the piston rod; the limiting ring is slidingly connected to the secondary buffer chamber, and is tightened between the top wall and the bottom step surface of the secondary buffer chamber by a secondary elastic buffer mechanism. The present invention utilizes the cooperation of the piston rod and the oil in the cylinder and the action of the primary spring to form a primary buffer structure, and forms a secondary buffer structure by the cooperation of the limiting ring and the secondary elastic buffer mechanism. The action of the two-stage buffer structure makes the stability and effect of the stamping better.

Description

Technical Field

[0001] The present invention relates to the technical field of stamping processing, and more particularly to a stamping device and processing technology for a stamping part. Background Art

[0002] Stamping is a forming process that uses a press and die to apply external force to sheet metal, strip, tube, and profiles, causing them to plastically deform or separate, thereby obtaining a workpiece (stamped part) of the desired shape and size. Stamping and forging are both types of plastic working (or pressure working), collectively known as forging. Stamping blanks are primarily hot-rolled and cold-rolled steel sheets and strips. 60-70% of the world's steel is sheet metal, much of which is stamped into finished products. Automotive bodies, chassis, fuel tanks, radiators, boiler drums, container housings, and the silicon steel sheets used in the iron cores of motors and electrical appliances are all stamped. Instruments, household appliances, bicycles, office machinery, and household utensils also contain a large number of stamped parts.

[0003] Taking automotive stamping parts as an example, there are many varieties of automotive stamping parts, such as automobile shock absorber stamping parts spring trays, spring seats, spring brackets, end caps, covers, compression valve covers, compression valve sleeves, oil seal seats, bottom covers, dust covers, impellers, oil cylinders, lugs, brackets, etc. Among automotive stamping parts, some become auto parts directly after stamping, while others require welding, machining, painting, and other processes before they can become auto parts.

[0004] The existing stamping processes are all made by stamping machines. However, for different stamping parts as mentioned above, for stamping sheets of different thicknesses, the degree of wear on the punch is different due to the different stamping forces. The worn punch needs to be replaced immediately, otherwise the quality of the processed stamping parts cannot be guaranteed. In order to solve this problem, a buffer structure is generally used to overcome this defect. For example, the existing patent application 201911003986.7 provides a buffer punch and a stamping method for a stamping die. The buffer punch can fully buffer the punch, effectively preventing it from experiencing significant wear, thereby increasing its service life. However, the existing buffer structures of this type still have the following problems:

[0005] 1. The complex buffer structure is difficult to guarantee the failure problem of subsequent use, and the simple buffer structure cannot guarantee the buffering effect;

[0006] 2. For the buffer structure, the control distance of the buffer cannot be effectively guaranteed. A short buffer distance cannot guarantee the buffer effect, and a long buffer distance will affect the stability of stamping. The control cannot meet the needs of plates of different thicknesses.

[0007] 3. The existing buffer structures all separate the buffering and stamping effects. If the stamping operation can be gradually completed during the buffering process, the damage to the parts caused by the instantaneous force of the stamping can be prevented at the same time. However, this structure with buffering and stamping in parallel is generally difficult to overcome the problem of insufficient stamping force during design (that is, due to the constant buffering, the stamping force is difficult to meet the actual requirements in a short distance stroke), resulting in incomplete stamping of the parts.

[0008] Therefore, in order to overcome the above technical problems, how to provide a stamping device and processing technology that balances the stamping and buffering effects is an issue that technical personnel in this field urgently need to solve. Summary of the Invention

[0009] In view of this, the present invention provides a stamping device and a processing technology for stamping parts, aiming to solve the above technical problems.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] A stamping device for a stamped part, comprising a stamping mechanism for controlling a stamping stroke; and further comprising:

[0012] A buffer oil cylinder, wherein the top of the buffer oil cylinder is connected to the control end of the stamping mechanism, the bottom of the buffer oil cylinder has a piston port, and the inside is processed with a primary buffer cavity and a secondary buffer cavity with gradually increasing diameters from the piston port upwards, and the side wall of the top of the buffer oil cylinder is opened with an oil port connected to the secondary buffer cavity;

[0013] A piston rod is sealingly and slidingly connected to the piston port, so that the primary buffer chamber and the secondary buffer chamber are filled with oil. A piston head is fixed to the top of the piston rod, which is slidably connected to the side wall of the primary buffer chamber. An oil flow hole is opened on the piston head. A stamping plate is fixed to the bottom of the piston rod. A primary spring is sleeved on the outside of the piston rod, and the primary spring is pressed tightly between the bottom surface of the buffer cylinder and the stamping plate.

[0014] A limiting ring, wherein the outer side wall of the limiting ring is slidably connected to the side wall of the secondary buffer cavity and is pressed tightly between the top wall and the bottom step surface of the secondary buffer cavity through a secondary elastic buffer mechanism.

[0015] Through the above technical solution, the stamping device provided by the present invention adds a buffer cylinder structure, and utilizes the cooperation of the piston rod and the oil in the cylinder, as well as the action of the first-level spring to form a first-level buffer structure. The second-level buffer structure is formed by the cooperation of the limiting ring and the second-level elastic buffer mechanism. Through the action of the two-stage buffer structure, buffering and stamping can be carried out in parallel, and the two-stage buffer structure gradually weakens the buffering force and eventually reaches a balance, which can meet the stamping pressure and make the stamping stability and effect better. Moreover, the overall structure is assembled only with a hydraulic cylinder structure and a spring structure, which reduces the complexity of the structure, reduces the failure rate, and facilitates later maintenance and replacement.

[0016] Preferably, in the stamping device of the above-mentioned stamping part, the secondary elastic buffer mechanism includes a guide rod and a secondary spring; the number of the guide rods is multiple, and the multiple guide rods are evenly distributed between the top wall and the bottom step surface of the secondary buffer cavity, and the guide rods pass through the guide holes provided on the limiting ring; the number of the secondary springs is the same as the number of the guide rods, and the multiple secondary springs are respectively mounted on the multiple guide rods and pressed tightly between the top wall of the secondary buffer cavity and the top surface of the limiting ring. By providing the guide rods, the up and down movement of the limiting ring can be made more stable, and the installation of the secondary springs is satisfied. The secondary springs also have a strong balancing and stabilizing effect when compressed and expanded.

[0017] Preferably, in the aforementioned stamping device for a stamped part, a mounting hole is formed on the bottom surface of the buffer cylinder and extends upward through the stepped surface of the secondary buffer chamber. A threaded hole is formed on the top surface of the secondary buffer chamber corresponding to the mounting hole. The guide rod is inserted through the mounting hole and is threadedly fastened to the threaded hole. Providing the mounting hole and the threaded hole facilitates installation of the guide rod. The guide rod is directly inserted from the bottom of the buffer cylinder and then connected to the threaded hole via the threaded portion at the top, resulting in a simple and convenient connection.

[0018] Preferably, in the stamping device for the above-mentioned stamped part, a countersunk hole is machined at the bottom of the mounting hole, the bottom large end of the guide rod is embedded in the countersunk hole, the countersunk hole is machined with an internal thread, and a plugging head is threadedly fastened thereto, and a sealing gasket is provided between the plugging head and the bottom large end of the guide rod. The provision of the countersunk hole is used to accommodate the bottom large end of the guide rod and the plugging head, and also facilitates the installation of a sealing gasket to prevent leakage.

[0019] Preferably, in the aforementioned stamping device for a stamped part, the buffer cylinder includes an upper cylinder body and a lower cylinder body, the upper cylinder body and the lower cylinder body are sealed and fastened via a flange structure, and the butt joint between the upper cylinder body and the lower cylinder body is located within the scope of the secondary buffer cavity. The detachable structure of the buffer cylinder facilitates the assembly of the internal structure.

[0020] Preferably, in the stamping device of the above-mentioned stamping parts, a pressure relief mechanism is further included, the pressure relief mechanism includes an oil tank, the inlet and outlet of the oil tank are connected to the oil port through an oil inlet line and an oil return line respectively, a solenoid valve is installed on the oil inlet line, and a one-way valve and an oil pump are pressed on the oil return line; a pressure sensor is installed on the top wall of the secondary buffer chamber. The present invention also provides a pressure relief mechanism for automatically eliminating faults. When the stamping is misaligned or other faults cause the stamping position to be incorrect, causing the piston rod to continue to move upward, then when the pressure sensor detects an abnormal pressure state, the solenoid valve opens and the oil is discharged into the oil tank. After the fault is eliminated, the oil is returned to the buffer cylinder through the oil pump, which has stronger automation performance.

[0021] Preferably, in the stamping device of the above-mentioned stamping part, the number of the oil flow holes is multiple, and the multiple oil flow holes are evenly arranged in a ring shape on the edge of the piston head, and the oil flow holes partially cover the bottom of the limiting ring. In addition to utilizing the elastic force of the spring, the two-stage buffer structure of the present invention is also controlled by the resistance of the oil. When the piston head moves upward, the oil passes through the piston head through the oil flow hole. However, due to the limitation of the aperture, the upward movement of the piston head is still subject to the resistance of the oil. When the piston head fits with the limiting ring, the oil flow hole is partially closed, and the oil flow rate is reduced again, and the resistance of the piston head is increased again, thereby gradually increasing the resistance of the oil. The structure is ingenious and the use effect is good.

[0022] Preferably, in the aforementioned stamping device for a stamped part, after the retaining ring and the piston head are coaxially attached, the exposed cross-sectional area of the oil flow hole is less than one-third of the cross-sectional area of the oil flow hole. Setting the enclosed area to less than one-third of the cross-sectional area of the oil flow hole can meet the requirement for controlling oil resistance.

[0023] Preferably, the stamping device for a stamped part further includes a guide frame, the guide frame being arranged outside the buffer cylinder, the side walls of the buffer cylinder being connected to the guide frame via a slide rail structure, forming a vertically sliding structure, the stamping mechanism being fixed to the top of the guide frame, and its control end being fixedly connected to the top of the buffer cylinder. The design of the guide frame and the slide rail structure can enhance the stability of the vertical movement of the buffer cylinder.

[0024] The present invention also provides a processing technology for a stamping device of a stamping part, in which the buffer oil cylinder is controlled to perform downward stamping by the stamping mechanism. When the stamping plate pushes the piston rod upward, the piston head pushes the limit ring upward. After the piston rod stops moving upward under the joint restriction of the oil pressure in the cylinder, the first-level spring and the second-level elastic buffer mechanism, the buffer oil cylinder is controlled to move upward by the stamping mechanism to complete a stamping action.

[0025] Through the above technical solution, the processing technology provided by the present invention can balance the coordination problems between the buffering action and the stamping action, so that the defects of the two structures can be compensated. Before the stamping action is completed, the buffering action can not only meet the buffering requirements, but also provide sufficient pressure for stamping, and have a better stamping operation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0027] Figure 1 The accompanying drawing is a schematic structural diagram of a stamping device for a stamping part provided by the present invention;

[0028] Figure 2 The accompanying drawing is a structural cross-sectional view of a stamping device for a stamping part provided by the present invention;

[0029] Figure 3 The accompanying drawing is a schematic structural diagram of the piston rod provided by the present invention;

[0030] Figure 4 The accompanying drawing is a schematic structural diagram of the limit ring provided by the present invention;

[0031] Figure 5 The accompanying drawing is a top view of the stop ring and the piston rod provided by the present invention after being attached;

[0032] Figure 6 The accompanying drawing is a schematic structural diagram of the guide rod provided by the present invention;

[0033] Figure 7 The accompanying drawing is a front view of the structure of the connection between the guide frame and the buffer cylinder provided by the present invention.

[0034] in:

[0035] 1- Stamping mechanism;

[0036] 2-buffer cylinder;

[0037] 21-upper cylinder body; 211-oil port; 22-lower cylinder body; 23-flange structure; 24-piston port; 25-primary buffer chamber; 26-secondary buffer chamber;

[0038] 3-piston rod;

[0039] 31-piston head; 311-oil flow hole; 32-stamping plate; 33-first-stage spring;

[0040] 4-limiting ring;

[0041] 41-guide hole;

[0042] 5-Secondary elastic buffer mechanism;

[0043] 51-guide rod; 52-secondary spring; 53-sealing head; 54-sealing gasket;

[0044] 6-pressure relief mechanism;

[0045] 61-Fuel tank; 62-Fuel inlet line; 63-Fuel return line; 64-Solenoid valve; 65-Check valve; 66-Fuel pump; 67-Pressure sensor;

[0046] 7-guide frame;

[0047] 71-Slide rail structure. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] See attached Figure 1 To the attached Figure 6 The embodiment of the present invention discloses a stamping device for a stamped part, comprising a stamping mechanism 1 for controlling a stamping stroke; and further comprising:

[0050] The buffer cylinder 2 has a top connected to the control end of the stamping mechanism 1. The bottom of the buffer cylinder 2 has a piston port 24, and the inside is processed with a first-level buffer cavity 25 and a second-level buffer cavity 26 with gradually increasing diameters from the piston port 24 upward. The top side wall of the buffer cylinder 2 is opened with an oil port 211 connected to the second-level buffer cavity 26;

[0051] The piston rod 3 is sealed and slidably connected to the piston port 24, so that the primary buffer chamber 25 and the secondary buffer chamber 26 are filled with oil. The top of the piston rod 3 is fixed with a piston head 31 that is slidably connected to the side wall of the primary buffer chamber 25. The piston head 31 is provided with an oil flow hole 311. The bottom end of the piston rod 3 is fixed with a stamping plate 32; the outer side of the piston rod 3 is provided with a primary spring 33, which is pressed tightly between the bottom surface of the buffer cylinder 2 and the stamping plate 32;

[0052] The outer side wall of the limiting ring 4 is slidably connected to the side wall of the secondary buffer cavity 26 and is pressed tightly between the top wall and the bottom step surface of the secondary buffer cavity 26 through the secondary elastic buffer mechanism 5.

[0053] In order to further optimize the above technical solution, the secondary elastic buffer mechanism 5 includes a guide rod 51 and a secondary spring 52; the number of guide rods 51 is multiple, and the multiple guide rods 51 are evenly distributed between the top wall and the bottom step surface of the secondary buffer cavity 26, and the guide rods 51 pass through the guide holes 41 opened on the limit ring 4; the number of secondary springs 52 is the same as the number of guide rods 51, and the multiple secondary springs 52 are respectively mounted on the multiple guide rods 51, and are tightly pressed between the top wall of the secondary buffer cavity 26 and the top surface of the limit ring 4.

[0054] In order to further optimize the above technical solution, a mounting hole is opened on the bottom surface of the buffer cylinder 2, which passes upward through the step surface of the secondary buffer chamber 26. The top surface of the secondary buffer chamber 26 has a threaded hole corresponding to the mounting hole. The guide rod 51 is inserted from the mounting hole and is threadedly fastened to the threaded hole.

[0055] In order to further optimize the above technical solution, a countersunk hole is processed at the bottom of the mounting hole, the bottom big end of the guide rod 51 is embedded in the countersunk hole, the countersunk hole is processed with an internal thread, and a sealing head 53 is threadedly fastened thereto, and a sealing gasket 54 is provided between the sealing head 53 and the bottom big end of the guide rod 51.

[0056] In order to further optimize the above technical solution, the buffer cylinder 2 includes an upper cylinder body 21 and a lower cylinder body 22. The upper cylinder body 21 and the lower cylinder body 22 are sealed and fastened together by a flange structure 23, and the butt joint between the upper cylinder body 21 and the lower cylinder body 22 is located within the range of the secondary buffer chamber 26.

[0057] When assembling the punching device provided in this embodiment, the guide rod 51 is first inserted into the mounting hole, the limiting ring 4 is then installed on the guide rod, and then the secondary spring 52 is installed. The lower cylinder 22 and the upper cylinder 21 are then pre-tightened through the flange structure 23. The top of the guide rod 51 and the threaded hole are then pre-tightened. Finally, the flange structure 23 is tightened, and then the guide rod 51 is tightened. To facilitate the connection of the guide rod 51, a hexagonal socket can be formed on the bottom surface of the large end of the guide rod 51. Similarly, the sealing head 53 also has a hexagonal socket to facilitate screwing connection.

[0058] In this embodiment, the stamping plate 32 and the piston rod 3 are directly connected by threaded fastening, which facilitates the assembly and disassembly of the primary spring 33.

[0059] In order to further optimize the above technical solution, a pressure relief mechanism 6 is also included. The pressure relief mechanism 6 includes an oil tank 61. The inlet and outlet of the oil tank 61 are connected to the oil port 211 through an oil inlet line 62 and an oil return line 63 respectively. A solenoid valve 64 is installed on the oil inlet line 62, and a one-way valve 65 and an oil pump 66 are pressed on the oil return line 63; a pressure sensor 67 is installed on the top wall of the secondary buffer chamber 26.

[0060] Due to the function of the one-way valve, when the oil is leaking, the oil can only enter the oil tank 61 from the oil inlet pipe 62, and when the oil is returning, it goes through the return oil pipe 63 through the action of the oil pump 66 and enters the buffer cylinder 2.

[0061] In order to further optimize the above technical solution, there are multiple oil flow holes 311, and the multiple oil flow holes 311 are evenly opened in a ring shape on the edge of the piston head 31, and the oil flow holes 311 partially cover the bottom of the limit ring 4.

[0062] like Figure 5 As shown, after the limiting ring 4 and the piston head 31 are coaxially fitted together, the exposed cross-sectional area of the oil flow hole 311 is less than one third of the cross-sectional area of the oil flow hole 311 .

[0063] In order to achieve a sealing effect after the limiting ring 4 and the piston head 31 are coaxially fitted together, the fitting surfaces of the limiting ring 4 and the piston head 31 may be made of hard rubber.

[0064] See attached Figure 7 This embodiment further includes a guide frame 7, which is arranged outside the buffer cylinder 2. The side walls of the buffer cylinder 2 are connected to the guide frame 7 via a slide rail structure 71, forming a vertical sliding structure. The stamping mechanism 1 is fixed to the top of the guide frame 7, and its control end is fixedly connected to the top of the buffer cylinder 2. In this embodiment, the stamping mechanism 1 can be controlled by a hydraulic cylinder structure. Figure 7 The slide rail structure 71 provided in the figure is respectively arranged on the upper cylinder body 21 and the lower cylinder body 22 to ensure that the disassembly of the upper cylinder body 21 and the lower cylinder body 22 is not affected, and is not shown in detail in the figure.

[0065] When stamping, the stamping device of the stamping part provided in this embodiment controls the buffer cylinder 2 to move downward for stamping through the stamping mechanism 1. When the stamping plate 32 pushes the piston rod 3 upward, the piston head 31 pushes the limit ring 4 upward. After the piston rod 3 stops moving upward under the joint restriction of the oil pressure in the cylinder, the first-level spring 33 and the second-level elastic buffer mechanism 5, the buffer cylinder 2 is controlled to move upward through the stamping mechanism 1 to complete a stamping action.

[0066] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0067] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stamping device for a stamped part, comprising a stamping mechanism (1) for controlling a stamping stroke; characterized in that: Also includes: A buffer oil cylinder (2), wherein the top of the buffer oil cylinder (2) is connected to the control end of the punching mechanism (1), the bottom of the buffer oil cylinder (2) has a piston port (24), and the inside is processed with a first buffer cavity (25) and a second buffer cavity (26) with gradually increasing diameters from the piston port (24) upwards, and the top side wall of the buffer oil cylinder (2) is provided with an oil port (211) communicating with the second buffer cavity (26); A piston rod (3), wherein the piston rod (3) is sealingly and slidingly connected to the piston port (24), so that the first buffer chamber (25) and the second buffer chamber (26) are filled with oil, a piston head (31) is fixed to the top of the piston rod (3) and is slidably connected to the side wall of the first buffer chamber (25), an oil flow hole (311) is opened on the piston head (31), and a stamping plate (32) is fixed to the bottom of the piston rod (3); a first spring (33) is sleeved on the outside of the piston rod (3), and the first spring (33) is pressed tightly between the bottom surface of the buffer cylinder (2) and the stamping plate (32); A limiting ring (4), wherein the outer side wall of the limiting ring (4) is slidably connected to the side wall of the secondary buffer cavity (26), and is pressed tightly between the top wall and the bottom step surface of the secondary buffer cavity (26) through a secondary elastic buffer mechanism (5); The buffer oil cylinder (2) comprises an upper cylinder body (21) and a lower cylinder body (22), wherein the upper cylinder body (21) and the lower cylinder body (22) are sealed and fastened together via a flange structure (23), and a butt joint between the upper cylinder body (21) and the lower cylinder body (22) is located within the range of the secondary buffer chamber (26); The pressure relief mechanism (6) is also included. The pressure relief mechanism (6) includes an oil tank (61). The inlet and outlet of the oil tank (61) are respectively connected to the oil port (211) through an oil inlet pipeline (62) and an oil return pipeline (63). A solenoid valve (64) is installed on the oil inlet pipeline (62), and a one-way valve (65) and an oil pump (66) are installed on the oil return pipeline (63). A pressure sensor (67) is installed on the top wall of the secondary buffer chamber (26). It also includes a guide frame (7), which is arranged outside the buffer cylinder (2). Both sides of the side walls of the buffer cylinder (2) are connected to the guide frame (7) through a slide rail structure (71), forming a vertical up and down sliding structure. The stamping mechanism (1) is fixed to the top of the guide frame (7), and its control end is fixedly connected to the top of the buffer cylinder (2).

2. A stamping device for a stamped part according to claim 1, characterized in that: The secondary elastic buffer mechanism (5) includes a guide rod (51) and a secondary spring (52); the number of the guide rods (51) is multiple, and the multiple guide rods (51) are evenly distributed between the top wall and the bottom step surface of the secondary buffer cavity (26), and the guide rods (51) pass through the guide holes (41) opened on the limiting ring (4); the number of the secondary springs (52) is the same as the number of the guide rods (51), and the multiple secondary springs (52) are respectively mounted on the multiple guide rods (51) and pressed tightly between the top wall of the secondary buffer cavity (26) and the top surface of the limiting ring (4).

3. A stamping device for a stamped part according to claim 1, characterized in that: The bottom surface of the buffer oil cylinder (2) is provided with a mounting hole that passes upward through the stepped surface of the secondary buffer cavity (26); the top surface of the secondary buffer cavity (26) has a threaded hole corresponding to the mounting hole; the guide rod (51) is inserted through the mounting hole and is threadedly fastened to the threaded hole.

4. A stamping device for a stamped part according to claim 3, characterized in that: A countersunk hole is machined at the bottom of the mounting hole, and the bottom large end of the guide rod (51) is embedded in the countersunk hole. The countersunk hole is machined with an internal thread and a sealing head (53) is threadedly fastened thereto. A sealing gasket (54) is provided between the sealing head (53) and the bottom large end of the guide rod (51).

5. A stamping device for a stamped part according to claim 1, characterized in that: There are multiple oil flow holes (311), and the multiple oil flow holes (311) are evenly arranged in a ring shape on the edge of the piston head (31), and the oil flow holes (311) partially cover the bottom of the limiting ring (4).

6. A stamping device for a stamped part according to claim 5, characterized in that: After the limiting ring (4) and the piston head (31) are coaxially fitted, the exposed cross-sectional area of the oil flow hole (311) is less than one third of the cross-sectional area of the oil flow hole (311).

7. A processing technology for a stamping device using a stamping part according to any one of claims 1 to 6, characterized in that: The buffer oil cylinder (2) is controlled to move downward for punching by the punching mechanism (1). When the punching plate (32) pushes the piston rod (3) upward, the piston head (31) pushes the limit ring (4) upward. After the piston rod (3) stops moving upward under the joint restriction of the oil pressure in the cylinder, the first-level spring (33) and the second-level elastic buffer mechanism (5), the buffer oil cylinder (2) is controlled to move upward by the punching mechanism (1), completing one punching action.

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