High-precision stamping equipment

Abstract

The high-precision stamping equipment comprises an upper die assembly, a lower die assembly, a female die, a punch and a back pressure mechanism, the female die is fixed to the upper die assembly and faces the lower die assembly, and a model groove matched with the punch in shape is formed in the side, opposite to the lower die assembly, of the female die; a circle of first protrusions matched with the model groove in shape are arranged on the periphery of the model groove. The punch is arranged on the lower die assembly and faces the model groove. The lower die assembly comprises a lower die base and a base plate arranged on the lower die base. The back pressure mechanism is fixed to the lower die base, and one end of the back pressure mechanism makes contact with the base plate. The device has the effect of improving the punching precision of general punching equipment.

Description

Technical Field

[0001] This application relates to the field of stamping technology, and in particular to a high-precision stamping device. Background Technology

[0002] Conventional stamping typically refers to a processing method that uses a die on a conventional punch press to separate or shape sheet metal to manufacture the required parts. Its core principle is to use the power provided by the punch press to apply pressure to the sheet metal through the die, causing the sheet metal to undergo plastic deformation or separation within the die. Conventional stamping is one of the most basic and widely used forms of stamping technology.

[0003] The conventional stamping process is simple in structure and highly efficient, and is widely used in various sheet metal cutting and simple forming scenarios. However, due to the poor stamping accuracy of the equipment, the produced parts have certain limitations in dimensional accuracy, shape accuracy and surface quality. In particular, the stamped cross-section of the produced parts is relatively rough, which is not conducive to the subsequent assembly of the parts or the use of the stamped cross-section as a functional surface.

[0004] Therefore, how to improve the stamping accuracy of ordinary stamping equipment has become an urgent problem to be solved in this field. Summary of the Invention

[0005] In order to improve the stamping accuracy of ordinary stamping equipment, this application provides a high-precision stamping equipment.

[0006] The high-precision stamping equipment provided in this application adopts the following technical solution: A high-precision stamping device includes an upper die assembly, a lower die assembly, a die cavity, a punch, and a back pressure mechanism, wherein: the die cavity is fixed on the upper die assembly and faces the lower die assembly; a pattern groove matching the shape of the punch is formed on one side of the die cavity opposite to the lower die assembly; a first protrusion matching the shape of itself is arranged around the pattern groove; the punch is placed on the lower die assembly and faces the pattern groove; the lower die assembly includes a lower die base and a pad disposed on the lower die base; the back pressure mechanism is fixed on the lower die base and one end contacts the pad.

[0007] By adopting the above technical solution, the die is fixed on the upper die assembly and has a pattern groove that matches the punch. During stamping, the punch is pressed into the pattern groove. The first protrusion can further constrain the material during stamping. The punch is set on the lower die assembly and can cooperate with the die to complete the stamping action. The back pressure mechanism is fixed on the lower die assembly and can provide back pressure to the pad at the moment of punching. The whole can realize the basic stamping function of the stamping equipment. When the upper die assembly presses down, the first protrusion presses the material being cut, and at the same time, the back pressure mechanism provides a certain counter pressure, which together with the first protrusion clamps the material being cut. When the punch moves upward to stamp, the first protrusion and the back pressure mechanism together restrict the material being cut, so that the stamped part is sheared off, forming a high-quality punched end face. By modifying the die and adding a back pressure mechanism, the stamping accuracy of the ordinary stamping equipment is greatly improved.

[0008] Preferably, it also includes a material belt disposed on the pad, the material belt being connected to an external drive unit.

[0009] By adopting the above technical solution, the strip is placed on the pad, and the back pressure generated by the back pressure mechanism is transmitted to the strip through the pad. After the upper die assembly is pressed down, the first protrusion presses the strip, which further restricts the area of ​​the strip to be cut, thus helping to improve the stamping accuracy of the stamping equipment.

[0010] Preferably, the pad has a through hole corresponding to the position of the punch, and the shape of the through hole matches the punch.

[0011] By adopting the above technical solution, the strip is placed on the pad, and the punch is set on the lower die base. During stamping, the punch passes through the through hole on the pad to stamp the strip. The through hole can provide accurate guidance for the punch, ensuring the stability and accuracy of the stamping process, and cutting the strip according to the shape of the punch.

[0012] Preferably, the mold groove is used to accommodate the punch, and the gap between the sidewall of the punch and the sidewall of the mold groove is less than or equal to 0.5% of the thickness of the strip.

[0013] By adopting the above technical solution, during stamping, the strip is pressed by the first protrusion and the pad, and the punch passes through the through hole to stamp the strip. The punch cuts the strip and presses it into the mold groove. During stamping, the strip needs to be completely cut by the punch to prevent incomplete cutting from causing part stamping failure and affecting the next stamping. The gap between the side wall of the punch and the side wall of the mold groove is less than or equal to 0.5% of the strip thickness. The gap of traditional ordinary stamping is 8% of the plate thickness, which is much smaller than the traditional ordinary stamping gap. Therefore, when the punch performs stamping, the strip is cut rather than torn, which can achieve a smoother blanking surface, significantly improve the blanking surface quality, meet the usage requirements of assembly structural parts, reduce subsequent finishing processes, and greatly improve the stamping accuracy on traditional ordinary stamping equipment without changing the main machine, only by optimizing the mold structure, making the blanking surface of the stamped parts smoother and improving the equipment utilization rate.

[0014] Preferably, the end of the punch away from the upper die assembly is connected to an external drive unit, and the punch is inserted into the die slot under the action of the external drive unit.

[0015] By adopting the above technical solution, the upper die assembly drives the die to press down. After the first protrusion presses the strip, the punch can be smoothly inserted into the mold slot under the action of the external driving component. The external driving component provides power to the punch, enabling the punch to smoothly perform the stamping action, which helps to achieve high-precision stamping.

[0016] Preferably, the die further includes a demolding mechanism, which is disposed on the side of the die away from the lower die assembly, and at least a portion of the demolding mechanism is located within the mold groove.

[0017] By adopting the above technical solution, a demolding mechanism is set on the side of the die away from the lower die assembly. When stamping, the punch presses against the strip and cuts the required finished part from the strip. The finished part and the punch enter the mold groove together. In order not to affect the next stamping, the demolding mechanism is used to push the finished part pressed into the mold groove out of the mold groove, preventing the finished part from getting stuck in the mold groove or sticking to the mold groove and affecting subsequent stamping. This allows the equipment to continuously and stably perform continuous stamping, improving production efficiency.

[0018] Preferably, the demolding mechanism includes an ejector rod and a drive member for driving the ejector rod to extend or retract. At least a portion of the ejector rod is located within the mold groove. When the ejector rod extends, at least a portion extends out of the mold groove. When the ejector rod retracts, there is a gap between it and the punch.

[0019] By adopting the above technical solution, when the demolding mechanism shrinks, the punch presses the strip. When the punch presses into the mold groove, the demolding mechanism does not contact the finished part pressed into the mold groove, which can ensure that the stamping process is carried out smoothly and does not affect the normal operation of the punch. When the demolding mechanism extends, it can completely eject the finished part stuck in the strip, preventing the finished part from being completely demolded due to the demolding mechanism being too short.

[0020] Preferably, the lower mold assembly further includes a limiting block, and multiple limiting blocks are provided. All the multiple limiting blocks are fixed on the pad plate and are evenly arranged on both sides of the material strip.

[0021] By adopting the above technical solution, multiple limiting blocks are evenly arranged on both sides of the strip to limit the strip. When the strip moves under the drive of the external drive component, the multiple limiting blocks evenly arranged on both sides of the strip can effectively restrict the lateral movement of the strip, ensure the positional accuracy of the strip during the stamping process, and thus improve the quality and consistency of the stamped parts. This will prevent the strip from shifting and causing problems in the next stamping.

[0022] Preferably, the back pressure mechanism includes a nitrogen spring, and there are multiple nitrogen springs, which are evenly arranged on the lower mold base.

[0023] By adopting the above technical solution, multiple nitrogen springs together form a back pressure mechanism. The nitrogen springs can provide a relatively constant force, and the response speed and stability are extremely high. When the upper die assembly presses down, when the first protrusion contacts the strip and applies force to the strip, the nitrogen springs respond immediately and provide back pressure to the pad, which is further transmitted to the strip. This causes the strip to be clamped by the first protrusion and the nitrogen springs on both sides, and the strip is compressed, so that the part punched by the punch has a smooth cut surface. The multiple nitrogen springs are evenly fixed under the pad, which can generate a more uniform and stable back pressure at the moment of punching, ensuring that the material is fully compressed at the moment of punching, better suppressing material warping, slippage or bending, thereby improving the quality of the punched section and improving production efficiency and reliability.

[0024] Preferably, the thickness of the first protrusion is less than or equal to 1 mm.

[0025] By adopting the above technical solution, the thickness of the first protrusion is limited to prevent the indentation from being too deep and reducing the fatigue strength of the part, thereby improving the integrity and fatigue performance of the workpiece surface. At the same time, during stamping, the smaller thickness allows the lower surface of the die 3 to also contact the strip. While the strip is pressed as a whole, the stamping point is further restricted by the protrusion, resulting in the stamped finished part having higher precision.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The material strip is clamped together by the first protrusion and the back pressure mechanism, and stamped by the punch. Together, the material strip is cut off to form a smooth punched section. By modifying the mold on the ordinary punching equipment and adding the back pressure mechanism, the stamping accuracy of the ordinary punching equipment is greatly improved. 2. A demolding mechanism is installed in the die cavity. After a single stamping is completed, the demolding mechanism is used to eject the finished part stuck in the mold slot, so as to facilitate the next stamping. 3. Using a nitrogen spring as the back pressure mechanism can provide a higher response speed and higher stability, while the back pressure provided is also relatively constant. Attached Figure Description

[0027] Figure 1 This is an exploded view of a high-precision stamping equipment die assembly with some parts hidden. Figure 2 This is an exploded view of the lower die assembly of a high-precision stamping equipment according to this application, after concealing some parts; Figure 3 This is a partially enlarged view of the through hole portion of the lower die assembly of a high-precision stamping equipment according to this application; Figure 4 This is a perspective view of a high-precision stamping device provided in the die portion of the upper die assembly according to this application; Figure 5 This is a partially enlarged view of the die portion of a high-precision stamping equipment according to this application. Figure 6 This is a perspective view of a part of a high-precision stamping equipment mounted on a lower die assembly, as described in this application. Figure 7 This is a perspective view of a high-precision stamping equipment according to this application when the punch enters the die cavity.

[0028] Explanation of reference numerals in the attached figures: 1. Upper mold assembly; 2. Lower mold assembly; 21. Backing plate; 22. Lower mold base; 23. Limiting block; 211. Second protrusion; 201. Through hole; 3. Die cavity; 31. First protrusion; 32. Demolding mechanism; 321. Ejector pin; 301. Mold groove; 4. Punch; 5. Back pressure mechanism; 6. Material belt. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0030] This application discloses a high-precision stamping device.

[0031] Reference Figure 1 , Figure 2 and Figure 4 A high-precision stamping device includes an upper die assembly 1, a lower die assembly 2, a die 3, a punch 4, a back pressure mechanism 5, and a strip 6. The upper die assembly 1 has a die 3 facing the lower die assembly 2, and the lower die assembly 2 has a punch 4 facing the upper die assembly 1. The strip 6 is located between the die 3 and the punch 4. The back pressure mechanism 5 is located within the lower die assembly 2 and provides a certain back pressure to the strip 6. The upper die assembly 1 is connected to an external drive unit and can perform stamping actions under the drive unit's influence. The die 3 is fixed to the upper die assembly 1 and faces the lower die assembly 2. The punch 4 is located on the lower die assembly 2 and faces the upper die assembly 1. The shape of the punch 4 matches the shape of the mold groove 301 on the die 3, and the two work together... The upper die assembly 1 and the lower die assembly 2, together with the first protrusion 31 on the die cavity 3 and the back pressure provided by the back pressure mechanism 5, enable the stamping operation of the strip 6. The back pressure mechanism 5 is fixed in the lower die base 22, and one end of the back pressure mechanism 5 is in contact with the pad 21. During stamping, the back pressure is provided to the strip 6 through the pad 21. The strip 6 is set on the lower die assembly 2 and connected to an external drive component. The external drive component is used to realize the movement and feeding of the strip 6. This cooperation achieves effective stamping of the strip 6 during the stamping process. Through the cooperative action of the upper die assembly 1 and the lower die assembly 2, combined with the first protrusion 31 set on the die cavity 3 and the back pressure provided by the back pressure mechanism 5, the strip 6 can be fully compressed at the moment of stamping, thereby shearing the strip 6, thus improving the effect of the stamping section quality and improving the stamping accuracy of the ordinary stamping equipment.

[0032] In this embodiment, refer to Figure 2 and Figure 4 The punching equipment employs a punching method where the die 3 is positioned higher and the punch 4 is positioned lower. When the upper die assembly 1 presses down, the die 3 moves downward along with the upper die assembly 1, and uses the first protrusion 31 to press the strip 6. Then, under the action of an external driving component, the punch 4 punches upward, pressing the strip 6 and pressing the cut part into the mold groove 301. This method of pressing before punching, rather than directly punching the strip 6, not only restricts the position of the entire strip 6 during pressing, but also further restricts the strip within the area enclosed by the first protrusion 31, ensuring that the cut portion of the strip 6 is flattened, preventing the strip from shrinking during punching and resulting in poor punching effect.

[0033] In this embodiment, both the die 3 and the punch 4 are made of ASP2053 powder high-speed steel, replacing the traditional DC53 steel, which improves the overall strength, toughness and fatigue resistance; and a rose gold coating is deposited on the surface of the die 3 and the punch 4 to enhance wear resistance, heat resistance and erosion stability, effectively extending the life of the die under high stress and small clearance punching conditions.

[0034] Reference Figure 4 The die 3 has a first protrusion 31 along the edge of the mold groove 301. The first protrusion 31 is fixed to the surface of the die 3 opposite to the lower mold assembly 2. The first protrusion 31 can be fixed by welding, gluing, integral molding or other methods. During stamping, the first protrusion 31 presses the strip 6. The outline of the first protrusion 31 is consistent with the shape of the mold groove 301, which can enhance the local pressing force of the cutting edge and improve the cross-sectional quality during cutting.

[0035] Reference Figure 1 The upper mold assembly 1 is formed by stacking multiple plates. The multiple plates of the upper mold assembly 1 are fixed together. The topmost plate is provided with a connection structure (not shown in the figure) that connects to an external driving component (not shown in the figure). The die 3 is installed on the plate closest to the lower mold assembly 2. The topmost plate drives the entire upper mold assembly 1 to move under the drive of the external driving component.

[0036] Reference Figure 2 The lower die assembly 2 is also formed by stacking multiple plates, wherein the pad plate 21 is the plate closest to the upper die assembly 1, and a through hole 201 matching the shape of the punch 4 is opened in the middle of the pad plate 21, through which the punch 4 passes. The bottom plate has a groove for installing the back pressure mechanism 5, and multiple back pressure mechanisms 5 are arranged in the groove. The lower die base 22 has through holes for the back pressure mechanism 5 to pass through, and through holes for the punch 4 to pass through.

[0037] In this embodiment, when no stamping is performed, the upper surface of the punch 4 is flush with the upper surface of the pad 21, or the upper surface of the punch is lower than the upper surface of the pad 21. Figure 1 The upper surface of the punch 4 is higher than the upper surface of the pad 21 to show the position of the punch 4. Figure 1 The position of punch 4 described herein is not the position of punch 4 when it is not being punched in actual application.

[0038] In this embodiment, there are multiple screws (not shown in the figure) and threaded holes (not shown in the figure) for connection between the upper mold assembly 1 and the lower mold assembly 2, as well as guide posts (not shown in the figure) and springs (not shown in the figure) for assisting the upper mold assembly 1 to press down. These are all options that can be selected by those skilled in the art according to the actual situation, and will not be described in detail here.

[0039] Reference Figure 3 On the pad 21, a second protrusion 211 is provided at the slot of the through hole 201. The second protrusion 211 is provided along the edge of the through hole 201 and has the same shape as the punch 4. The projection of the first protrusion 31 on the pad 21 coincides with the second protrusion 211. When the upper die assembly 1 is pressed down, the second protrusion 211 and the first protrusion 31 work together to clamp the strip 6. The thickness of the first protrusion 31 and the second protrusion 211 is small. In the optimal case, the thickness of the first protrusion 31 and the second protrusion 211 is 1 mm, which does not affect the placement of the strip 6 on the pad 21 and does not affect the stability of the strip 6.

[0040] Reference Figure 2 and Figure 6 In this embodiment, the back pressure mechanism 5 is a nitrogen spring 51. There are four nitrogen springs 51, which are evenly distributed under the pad 21 to support the pad 21 and provide a certain back pressure. In other embodiments of this application, the back pressure mechanism 5 can adopt other structures with the same function as the nitrogen spring 51, such as a servo electric cylinder or a hydraulic system.

[0041] Reference Figure 4 and Figure 5 The die cavity 3 further includes a demolding mechanism 32, which includes an ejector rod 321 and a driving member for driving the ejector rod 321. At least a portion of the ejector rod 321 is located within the mold groove 301. When the punch 4 is inserted into the mold groove 301, there is a gap between the ejector rod 321 and the part punched into the mold groove 301 by the punch 4. When a single punching is completed and the upper die assembly 1 drives the die cavity 3 to move upward, the demolding mechanism 32 works to extend the ejector rod 321 and push out the part that has been pressed into the mold groove 301.

[0042] The demolding mechanism 32 has multiple options, including spring ejector pins or cylinder-driven push rods, which eject the finished part stuck in the mold groove 301 after stamping to prevent mold jamming and sticking; and improve the stability and efficiency of continuous stamping process.

[0043] In other embodiments of this application, a receiving mechanism is also included. After a single stamping is completed, when the upper die assembly 1 is lifted, the receiving mechanism extends between the upper die assembly 1 and the lower die assembly 2. The receiving mechanism should be provided with a structure for collecting the finished parts pushed out of the mold slot 301 by the demolding mechanism 32, so that the stamping equipment can realize continuous stamping, and it is not necessary to manually remove the finished parts after a single stamping, which increases the safety of stamping and improves the efficiency of stamping.

[0044] In this embodiment, the end of the punch 4 away from the upper die assembly 1 is connected to an external drive unit (not shown in the figure). The external drive unit can be a hydraulic cylinder or a pneumatic cylinder, etc., which can provide the punch 4 with the power required for stamping, so that the punch 4 can cut the strip and stamp out the required finished part. During stamping, at least a part of the punch 4 enters the mold groove 301 to prevent the part of the strip 6 that has been cut off from the whole strip from still having a connection part, making it difficult to improve the stamping accuracy.

[0045] Reference Figure 1 and Figure 6 The strip 6 is disposed on the pad 21, and one end of the strip 6 is connected to an external drive unit (not shown in the figure). Under the action of the external drive unit, the strip 6 moves a certain distance after a single stamping, thus performing the next stamping. The external drive unit can be disposed at the head of the strip 6, that is, at the position of the strip 6 facing the direction of movement, pulling the strip 6; the external drive unit can also be disposed at the tail of the strip 6, that is, at the end of the strip 6 before it has passed the stamping, pushing the strip 6; the external drive unit can also be disposed at the bottom of the strip 6, driving the strip 6 to move. Selecting a suitable drive unit, driving method, and installation position of the drive unit according to actual needs is all achievable by those skilled in the art, and will not be elaborated further here.

[0046] Reference Figure 6 The limiting block 23 is fixed on the pad 21 and is evenly distributed on both sides of the material belt 6 for easy observation. Figure 5 Only the limiting block 23 on one side of the strip 6 is shown, and there is a gap between the limiting block 23 and the punch 4. In this embodiment, there are three limiting blocks 23, which respectively limit the position of the strip 6 when it is fed, the position of the strip 6 when it is about to be cut, and the position of the strip after it is cut. This ensures that the strip 6 is restricted during feeding, cutting, and discharging, and does not deviate, preventing the stamped finished parts from being of poor quality or even completely unusable. At the same time, on the side of the upper die assembly 1 opposite to the lower die assembly 2, there are multiple grooves that match the limiting blocks 23. During stamping, the limiting blocks 23 are in the grooves.

[0047] Reference Figure 7 When the punch 4 is pressed into the mold groove 301, the gap between the side wall of the punch 4 and the corresponding side wall of the mold groove 301 is extremely small, only 0.5% of the thickness of the strip 6. This greatly reduces the gap between the mold and the punch. The small gap design makes the finished part sheared rather than torn, resulting in a smoother punched surface of the finished part, which facilitates subsequent assembly of the finished part or the use of the punched surface as a functional surface.

[0048] Reference Figure 5 The groove 301 has an arc-shaped chamfer at the slot, which can alleviate stress concentration, reduce mold wear, and extend service life. The arc-shaped chamfer is located at the slot of the mold groove 301. The die 3 extends from the side of the die cavity near the lower die assembly 2 into the mold groove 301. During stamping, the punch 4 presses a portion of the strip 6 into the mold groove 301. The arc chamfer can optimize material flow during stamping, suppress the initiation and propagation of microcracks, and make the blanking surface smoother.

[0049] The implementation principle of a high-precision stamping device according to an embodiment of this application is as follows: The strip 6 is placed on the pad 21 and limited by the limiting block 23. The strip 6 is connected to an external driving component. During stamping, the upper die assembly 1, under the action of the external driving component, drives the die 3 to press down. The first protrusion 31 and the second protrusion 211 are opposite to each other and clamp the strip 6 together. The limiting block 23 enters the matching groove. At this time, the back pressure mechanism 5 provides a certain counter pressure to the pad 21, making the strip 6 clamped more tightly. Then, the punch 4 moves upward to stamp the strip 6. When the punch 4 is stamping upward, it will... Part of the strip material is stamped into the mold groove 301, and the punch 4 also enters the mold groove 301 to completely cut the strip material 6. After stamping, the punch 4 retracts into the lower die assembly 2, and the upper die assembly 1 is slowly lifted by the external drive component. At the same time, the ejector rod 321 extends to push out the finished part stuck in the mold groove 301. At this time, the finished part can be collected by the external receiving mechanism when it falls from the mold groove 301, or it can be collected manually. After completion, the external receiving mechanism retracts to the outside of the punch press, and the upper die assembly 1 drives the die 3 to press down again for the next stamping under the action of the external drive component.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-precision stamping apparatus, characterized by: The utility model relates to a die set, which comprises an upper die assembly (1), a lower die assembly (2), a die (3), a punch (4) and a back pressure mechanism (5). The die (3) is fixed on the upper die assembly (1) and faces the lower die assembly (2), and a model groove (301) matching the shape of the punch (4) is formed on one side of the die (3) opposite to the lower die assembly (2), and a first protrusion (31) matching the shape of the model groove (301) is arranged around the model groove (301). The punch (4) is arranged on the lower die assembly (2) and faces the model groove (301). The lower die assembly (2) comprises a lower die seat (22) and a backing plate (21) arranged on the lower die seat (22), and the back pressure mechanism (5) is fixed on the lower die seat (22) and contacts the backing plate (21) at one end.

2. The high-precision stamping apparatus according to claim 1, characterized by: The utility model further comprises a material belt (6) arranged on the backing plate (21), and the material belt (6) is connected to an external driving member.

3. The high-precision stamping apparatus according to claim 1, characterized by: The backing plate (21) is provided with a through hole (201) corresponding to the position of the punch (4), and the shape of the through hole (201) matches the shape of the punch (4).

4. The high-precision stamping apparatus according to claim 2, characterized by: The model groove (301) is used for accommodating the punch (4), and the gap between the side wall of the punch (4) and the side wall of the model groove (301) is less than or equal to 0.5% of the thickness of the material belt (6).

5. The high-precision stamping apparatus according to claim 1, characterized by: The end of the punch (4) away from the upper die assembly (1) is connected to an external driving member, and the punch (4) is inserted into the model groove (301) under the action of the external driving member.

6. The high-precision stamping apparatus according to claim 1, wherein: The die (3) further comprises an ejection mechanism (32) arranged on the side of the die (3) away from the lower die assembly (2), and at least a part of the ejection mechanism (32) is located in the model groove (301).

7. A high precision stamping apparatus according to claim 6, wherein: The ejection mechanism (32) comprises a ejector rod (321) and a driving member for driving the ejector rod (321) to extend and retract, at least a part of the ejector rod (321) is located in the model groove (301), at least a part of the ejector rod (321) extends out of the model groove (301) when the ejector rod (321) is extended, and the ejector rod (321) has a gap with the punch (4) when the ejector rod (321) is retracted.

8. The high-precision stamping apparatus according to claim 2, characterized by: The lower die assembly (2) further comprises a plurality of limiting blocks (23), and the plurality of limiting blocks (23) are fixed on the backing plate (21) and arranged on both sides of the material belt (6).

9. The high-precision stamping apparatus according to claim 1, wherein: The back pressure mechanism (5) comprises a plurality of nitrogen gas springs (51), and the plurality of nitrogen gas springs (51) are arranged on the lower die seat (22).

10. The high-precision stamping apparatus according to claim 1, characterized by: The thickness of the first protrusion (31) is less than or equal to 1 mm.

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