Metal stamping die capable of resisting fracture lines

Abstract

The utility model discloses a fracture-crack-resistant metal stamping die. The fracture-crack-resistant metal stamping die comprises a lower die assembly and an upper die assembly. The lower die assembly comprises a bottom plate, a first female die plate, an ejector block and a second female die plate, and the second female die plate is detachably arranged on the first female die plate. The upper die assembly is arranged above the lower die assembly in a liftable mode, the upper die assembly comprises a cover plate, a clamping plate, a stripper plate and a stamping head, the lower end of the stripper plate can abut against a stamping part, and the stamping head is used for punching the stamping part. By replacing the second female die plate, the thickness of the second female die plate can be selected and replaced according to the thickness of the stamping part, so that the gap is increased in the blanking and stretching process, the pressure stress of the stamping part is reduced, deep drawing forming is convenient, and fracture lines on the metal stamping section are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of stamping processing, in particular to a metal stamping die of anti-fracture. BACKGROUND

[0002] The stamping die has a wide application in the field of metal processing, especially in the industries of automobile, household appliance, aerospace, etc. At present, the design and manufacture of stamping die have made remarkable progress, including the selection of die material, the optimization of die structure and the improvement of stamping process. However, in the stamping process, the metal is still prone to fracture on the stamping section. SUMMARY

[0003] The utility model discloses at least solve one of the technical problems in the prior art. For this purpose, the utility model provides a metal stamping die of anti-fracture, which can improve the fracture on the metal stamping section.

[0004] The metal stamping die of anti-fracture according to the embodiment of the utility model comprises:

[0005] A lower die assembly, the lower die assembly comprises a bottom plate, a first die plate, a top material block and a second die plate, the first die plate is arranged on the bottom plate, the top material block is arranged in the first die plate, the second die plate is detachably arranged on the first die plate, the second die plate has a die hole, the top material block is located in the die hole, and the stamping piece to be stamped is placed on the second die plate; and

[0006] An upper die assembly, the upper die assembly is arranged above the lower die assembly in a lifting manner, the upper die assembly comprises a cover plate, a clamping plate, a stripping plate and a stamping head, the clamping plate is arranged at the lower end of the cover plate, a guide column is arranged on the clamping plate, the lower end of the guide column penetrates into the lower die assembly, the stamping head is arranged on the clamping plate, the position of the stamping head corresponds to the position of the top material block, the stripping plate is movably sleeved on the guide column and located below the clamping plate, the stamping head penetrates into the stripping plate, the lower end of the stripping plate can abut against the stamping piece, and the stamping head is used for blanking the stamping piece.

[0007] The metal stamping die of anti-fracture according to the embodiment of the utility model has at least the following beneficial effects: by replacing the second die plate, the thickness of the second die plate can be selected and replaced according to the thickness of the stamping piece, so that the gap increases in the blanking and drawing process, the compressive stress of the stamping piece is reduced, the deep drawing forming is facilitated, and the fracture on the metal stamping section is improved.

[0008] According to some embodiments of the utility model, the material removal plate is provided with a lubricating assembly, the lubricating assembly is located on the side of the stamping head, and the lubricating assembly is used for lubricating the stamping head.

[0009] According to some embodiments of the utility model, the material removal plate is provided with a stamping hole, the stamping head is arranged in the stamping hole, a circumferential wall of the stamping hole is provided with an oil storage groove, one side of the oil storage groove is provided with a first opening, and the lubricating assembly comprises:

[0010] a plurality of balls, the plurality of balls are uniformly distributed in the oil storage groove, and outer surfaces of the balls are in contact with the oil storage member.

[0011] an oil storage member, the oil storage member is arranged at the bottom of the oil storage groove, the outer surfaces of the balls are in contact with the oil storage member, and the oil storage member is used for adsorbing lubricating oil.

[0012] According to some embodiments of the utility model, the adjacent balls are provided with a partition plate, and the partition plate is arranged in the oil storage groove.

[0013] According to some embodiments of the utility model, the partition plate is provided with a profiling portion towards the side surface of the ball, and the profiling portion is profiled with the ball.

[0014] According to some embodiments of the utility model, the material removal plate is further provided with an oil inlet channel, the oil inlet channel is communicated with the oil storage groove, and the oil inlet channel is used for adding lubricating oil.

[0015] According to some embodiments of the utility model, the material removal plate is provided with a stamping hole, the stamping head is arranged in the stamping hole, a circumferential wall of the stamping hole is provided with a mounting groove, and the lubricating assembly comprises:

[0016] a mounting box, the mounting box is mounted in the mounting groove, the mounting box is provided with an oil storage groove, and one side of the oil storage groove is provided with a second opening;

[0017] a plurality of balls, the plurality of balls are uniformly distributed in the oil storage groove, and the balls are in contact with the outer side wall of the stamping head through the second opening; and

[0018] an oil storage member, the oil storage member is arranged in the oil storage groove, the outer surfaces of the balls are in contact with the oil storage member, and the oil storage member is used for adsorbing lubricating oil.

[0019] According to some embodiments of the utility model, the lubricating assembly further comprises an oil inlet pipe, one end of the oil inlet pipe is communicated with the mounting box, and the other end of the oil inlet pipe is connected with an external oil storage tank.

[0020] According to some embodiments of this utility model, the oil storage component is made of cotton material.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of a fracture-resistant metal stamping die according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A schematic diagram of the lower die assembly of a fracture-resistant metal stamping die is shown.

[0025] Figure 3 for Figure 1 A schematic diagram of the upper die assembly of a fracture-resistant metal stamping die is shown.

[0026] Figure 4 for Figure 3 An enlarged schematic diagram of the lubrication assembly of the upper mold assembly is shown.

[0027] Figure 5 for Figure 3 A schematic diagram of a lubrication assembly of another embodiment of the upper mold assembly is shown;

[0028] Figure 6 for Figure 5 A schematic diagram of the lubrication assembly is shown.

[0029] Figure label:

[0030] Lower mold assembly 10; base plate 11; first concave mold plate 12; ejector block 13; second concave mold plate 14;

[0031] Upper mold assembly 20; cover plate 21; clamping plate 22; stripper plate 23; punching hole 231; punching head 24; guide post 25;

[0032] Lubrication component 30; oil reservoir 31; ball bearing 32; mounting box 33; oil inlet pipe 34. Detailed Implementation

[0033] The embodiments of the present application are described below in detail, examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation to the present application.

[0034] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by the upper, lower, front, rear, left, right, etc. is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation to the present application.

[0035] In the description of the present application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. is understood as not including the number, above, below, etc. is understood as including the number. If it is described to the first, second, only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0036] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0037] Referring to Figures 1 to 3 , the anti-fracture metal stamping die according to the embodiments of the present application, the anti-fracture metal stamping die comprises: a lower die assembly 10 and an upper die assembly 20, the lower die assembly 10 comprises a bottom plate 11, a first die plate 12, a top material block 13 and a second die plate 14, the first die plate 12 is arranged on the bottom plate 11, the top material block 13 is arranged in the first die plate 12, and the second die plate 14 is detachably arranged on the first die plate 12, the second die plate 14 has a die hole, the top material block 13 is located in the die hole, and a stamping piece to be stamped is placed on the second die plate 14; the upper die assembly 20 is arranged above the lower die assembly 10 in a lifting manner, the upper die assembly 20 comprises a cover plate 21, a clamping plate 22, a stripping plate 23 and a stamping head 24, the clamping plate 22 is arranged at the lower end of the cover plate 21, a guide column 25 is arranged on the clamping plate 22, the lower end of the guide column 25 is arranged in the lower die assembly 10, the stamping head 24 is arranged on the clamping plate 22, the position of the stamping head 24 corresponds to the position of the top material block 13, the stripping plate 23 is movably sleeved on the guide column 25 and located below the clamping plate 22, the stamping head 24 is arranged in the stripping plate 23, and the lower end of the stripping plate 23 can abut against the stamping piece. The stamping head 24 is used for blanking the stamping piece.

[0038] Specifically, in the lower die assembly 10, the base plate 11 is made of high-strength and high-rigidity metal material as the basic support of the entire lower die assembly 10, ensuring the stability of the mold during operation. It is fixedly installed on the base plate 11, and its surface is precisely machined to ensure the flatness of the initial contact surface with the stamped part, reduce stress concentration during initial stamping, and thus reduce the risk of crack generation. The knockout block 13 is embedded in the first die plate 12 and can be designed to be elastically or mechanically lifted to assist the stamped part to smoothly come out of the mold after stamping is completed, while avoiding cracks generated in the demolding process due to uneven stress. The second die plate 14 is detachably installed on the first die plate 12, which facilitates quick replacement of the mold according to the needs of different stamped parts, improving production flexibility. The second die plate 14 is provided with a die hole for precise positioning of the part to be stamped and ensuring uniform material flow during stamping to reduce crack generation. The knockout block 13 is located in the die hole to cooperate with the punch 24 during stamping.

[0039] In the upper die assembly 20, the cover plate 21 serves as the top of the upper die assembly 20 and is connected to the power part of the stamping machine through a connecting piece to realize the lifting action of the mold. The clamping plate 22 is fastened below the cover plate 21 to fix and support the punch 24 and the guide column 25. The clamping plate 22 is designed to ensure sufficient strength and rigidity to withstand the huge pressure during stamping. The guide column 25 is provided in the clamping plate 22 and extends downward through the lower die assembly 10 to guide the mold closing and ensure the stamping accuracy. The precision and smoothness of the guide column 25 are crucial to reducing lateral forces during stamping, preventing mold wear and crack generation. The punch 24 is installed on the clamping plate 22, and its shape and size are matched with the profile of the part to be stamped to ensure the accuracy and consistency of stamping. The material selection of the punch 24 needs to consider wear resistance and impact resistance to reduce wear and breakage during long-term use. The knockout plate 23 is movably sleeved on the guide column 25 and located below the clamping plate 22. The design of the knockout plate 23 enables it to automatically eject the stamped part from the die after stamping is completed as the upper mold rises, reducing manual intervention. Meanwhile, its lower end can abut against the stamped part to ensure the stability of the stamped part during demolding, further reducing the risk of breakage.

[0040] In use, first, the metal part to be stamped is placed on the second die plate 14, and the stamping machine is started. The upper die assembly 20 descends with the cover plate 21, and the punch 24 aligns with the knockout block 13 in the die hole for blanking. The guide column 25 ensures the accurate positioning of the upper mold and the lower mold, and the knockout plate 23 remains in contact with the stamped part during stamping to provide necessary support. After stamping is completed, the upper mold rises, and the knockout plate 23 moves upward to eject the stamped part from the mold, completing the entire stamping cycle.

[0041] Therefore, it can be understood that the metal stamping die against cracking according to the embodiment of the utility model has at least the following beneficial effects: by replacing the second die plate 14, the thickness of the second die plate 14 can be selected and replaced according to the thickness of the stamping part, so that the gap is increased during the blanking and drawing process, the stamping part is reduced under pressure stress, and then the deep drawing forming is convenient, so that the cracking on the metal stamping section is improved.

[0042] With reference to Figures 3 to 5 In some embodiments of the utility model, the lubricating assembly 30 is arranged in the stripper plate 23, and the lubricating assembly 30 is located on the circumferential side of the stamping head 24 and is used for lubricating the stamping head 24. On the basis of the metal stamping die against cracking according to the above-mentioned embodiment, the utility model further arranges the lubricating assembly 30 in the stripper plate 23 to optimize the lubricating effect of the stamping head 24, so as to further reduce the friction and wear in the stamping process and reduce the risk of cracking.

[0043] The lubricating assembly 30 is embedded in the stripper plate 23 and located on the circumferential side of the stamping head 24. Such a design ensures that the lubricating substance can directly and uniformly act on the working surface of the stamping head 24 without the need for additional lubricating steps or equipment. The lubricating channel has several small lubricating channels inside the stripper plate 23, which are connected with the external lubricating source (such as a lubricating pump or a lubricating oil tank). When lubrication is needed, the lubricating substance is transported to the circumferential side of the stamping head 24 through these channels. The lubricating outlet is provided with a plurality of tiny lubricating outlets at the position where the stripper plate 23 contacts or is close to the stamping head 24. These outlets allow the lubricating substance to flow out at an appropriate pressure and flow rate and uniformly cover the surface of the stamping head 24. The lubricating substance can be various lubricating oils, lubricating greases or solid lubricants suitable for metal stamping. When selecting a specific lubricating substance, the properties of the stamping material, the stamping speed, the working temperature and the material of the die should be considered.

[0044] Before the start of the stamping process or at an appropriate time during the stamping process, the lubricating substance is transported to the lubricating outlet through the lubricating channel and uniformly applied to the surface of the stamping head 24. The lubricating substance forms a thin lubricating film between the stamping head 24 and the metal part to be stamped, effectively reducing the friction and wear between the two. The lubricating film can also help to disperse the stress during the stamping process, further reducing the risk of cracking.

[0045] With reference to Figures 3 to 5In some embodiments of the utility model, the material removal plate 23 has a punching hole 231, the punching head 24 is arranged in the punching hole 231, the peripheral wall of the punching hole 231 is provided with an oil storage groove 31, one side of the oil storage groove 31 is provided with a first opening, the lubricating assembly 30 comprises: a ball 32 and an oil storage part (not shown in the figure), the ball 32 is arranged in the oil storage groove 31, the ball 32 is provided with a plurality of balls, the plurality of balls 32 are uniformly distributed in the oil storage groove 31, the outer surface of the ball 32 is abuttable with the outer side wall of the punching head 24 through the first opening; the oil storage part is arranged at the bottom of the oil storage groove 31, the outer surface of the ball 32 is in contact with the oil storage part, and the oil storage part is used for adsorbing lubricating oil.

[0046] Specifically, the structure of the material removal plate 23 is further optimized, and the innovative lubricating mechanism is integrated in the design of the punching hole 231 to further improve the lubricating effect of the punching head 24 and reduce the risk of wear and tear. The material removal plate 23 is provided with a punching hole 231 in the center, and the hole allows the punching head 24 to be arranged therein for punching operation. The size and shape of the punching hole 231 need to be accurately matched with the punching head 24 to ensure the accuracy and stability of the punching. On the peripheral wall of the punching hole 231, the oil storage groove 31 is ingeniously provided. The oil storage groove 31 is arranged around the punching hole 231 to form a continuous annular or segmented groove for storing lubricating oil. The oil storage groove 31 is provided with a first opening at one side or multiple places, and the opening allows the lubricating oil in the oil storage groove 31 to contact the outer side wall of the punching head 24, providing convenience for subsequent lubrication process. The ball 32 is arranged in the oil storage groove 31, and a plurality of balls 32 are uniformly distributed in the oil storage groove 31. The material and size of the ball 32 need to be selected according to the actual application scene to ensure that it can effectively roll and bear enough pressure. The outer surface of the ball 32 is abuttable with the outer side wall of the punching head 24 through the first opening. When the punching head 24 moves up and down in the punching hole 231, the ball 32 will roll along with it, evenly spreading the lubricating oil in the oil storage groove 31 on the surface of the punching head 24. The oil storage part is placed at the bottom of the oil storage groove 31, and the material thereof needs to have good oil absorption and oil retention properties to adsorb and store enough lubricating oil. The oil storage part is in contact with the outer surface of the ball 32, ensuring that the ball 32 can continuously obtain lubricating oil from the oil storage part when rolling, maintaining the continuity of the lubricating effect.

[0047] In the punching process, when the punching head 24 is arranged in the punching hole 231 and moves up and down, the ball 32 will roll in the oil storage groove 31 along with it. Since the outer surface of the ball 32 is in contact with the outer side wall of the punching head 24 and the oil storage part, the ball 32 will evenly spread the lubricating oil on the surface of the punching head 24. At the same time, the design of the first opening ensures that the lubricating oil can smoothly flow out and cover the entire working area of the punching head 24.

[0048] Further, in some embodiments of the present utility model, the adjacent rolling balls 32 have a partition plate (not shown in the figure) between them, which is arranged in the oil storage groove 31. The partition plate is accurately placed in the oil storage groove 31 and located between the adjacent rolling balls 32. In this way, each rolling ball 32 is separated by the partition plate, forming an independent lubrication unit. The material of the partition plate needs to have sufficient strength and wear resistance to ensure that it will not deform or be damaged during the stamping process. Its shape can be designed to adapt to the shape of the oil storage groove 31 and the rolling ball 32, usually annular or arc-shaped, so as to tightly fit the inner wall of the oil storage groove 31 and the outer surface of the rolling ball 32. The main function of the partition plate is to separate the adjacent rolling balls 32 to prevent them from being pressed or misaligned with each other during the stamping process, thereby maintaining the stable arrangement of the rolling balls 32. The partition plate can also guide the flow of lubricating oil to ensure that the lubricating oil can be evenly distributed on the surface of each rolling ball 32 and further applied to the outer side wall of the stamping head 24. The presence of the partition plate also enhances the structural strength of the oil storage groove 31 and improves the overall durability of the mold.

[0049] During the stamping process, when the stamping head 24 moves up and down in the stamping hole 231, the rolling balls 32 will roll with the movement of the stamping head 24. Due to the presence of the partition plate, the adjacent rolling balls 32 are effectively separated, avoiding interference between each other. At the same time, the partition plate guides the uniform flow of lubricating oil in the oil storage groove 31 and applies it to the surface of the stamping head 24 through the first opening.

[0050] Further, in some embodiments of the present utility model, the partition plate has a profiling portion towards the side surface of the rolling ball 32, which is profiled with the rolling ball 32. This design not only improves the fit between the partition plate and the rolling ball 32, but also further enhances the uniformity of the distribution of lubricating oil, thereby reducing friction and wear during the stamping process and improving the quality and production efficiency of the stamped parts

[0051] Further, in some embodiments of the present utility model, the stripper plate 23 is also provided with an oil inlet channel, which communicates with the oil storage groove 31, and the oil inlet channel is used for adding lubricating oil. This design not only simplifies the process of adding lubricating oil, but also ensures the sufficient supply of lubricating oil in the oil storage groove 31, thereby maintaining good lubrication effect during the stamping process.

[0052] Referring to Figures 3 to 6In some embodiments of the present application, the stripper plate 23 has a stamping hole 231, and the stamping head 24 is arranged in the stamping hole 231. The peripheral wall of the stamping hole 231 is provided with a mounting groove. The lubricating assembly 30 includes a mounting box 33, a plurality of balls 32, and an oil storage member. The mounting box 33 is mounted in the mounting groove. The mounting box 33 is provided with an oil storage groove 31. A second opening is formed on one side of the oil storage groove 31. The balls 32 are evenly distributed in the oil storage groove 31. The balls 32 are in contact with the outer side wall of the stamping head 24 through the second opening. The oil storage member is arranged in the oil storage groove 31. The outer surface of the balls 32 is in contact with the oil storage member. The oil storage member is used for adsorbing lubricating oil.

[0053] Specifically, the present application provides a mounting groove on the peripheral wall of the stamping hole 231 of the stripper plate 23, and a lubricating assembly 30 containing an oil storage groove 31, balls 32, and an oil storage member is mounted in the mounting groove. This design not only makes the installation of the lubricating assembly 30 more stable, but also further improves the lubrication effect by the adsorption of the oil storage member on the lubricating oil, reducing friction and wear during the stamping process. The mounting box 33 is precisely mounted in the mounting groove on the peripheral wall of the stamping hole 231 of the stripper plate 23, ensuring the stability and reliability of the lubricating assembly 30. The mounting box 33 is internally provided with an oil storage groove 31 for storing lubricating oil. A second opening is formed on one side of the oil storage groove 31, allowing the balls 32 to contact the outer side wall of the stamping head 24 through the opening. A plurality of balls 32 are evenly distributed in the oil storage groove 31. They contact the outer side wall of the stamping head 24 through the second opening and roll with the up-and-down movement of the stamping head 24, thereby evenly applying lubricating oil to the surface of the stamping head 24. The number and distribution of the balls 32 can be optimized according to the size and shape of the stamping head 24 to ensure the best lubrication effect. The oil storage member is arranged in the oil storage groove 31 and in contact with the outer surface of the balls 32. The oil storage member has excellent oil absorption performance and can adsorb and store a large amount of lubricating oil. When the balls 32 roll in the oil storage groove 31, they will contact the oil storage member and take away the lubricating oil attached to the oil storage member, thereby ensuring that the surface of the balls 32 always has enough lubricating oil.

[0054] During the stamping process, the ball 32 will roll with the movement of the stamping head 24 when the stamping head 24 moves up and down in the stamping hole 231. The ball 32 contacts the outer side wall of the stamping head 24 through the second opening and evenly spreads the lubricating oil attached to its surface on the surface of the stamping head 24. At the same time, the oil storage member continuously adsorbs and stores lubricating oil through its oil absorption performance, providing continuous lubrication for the ball 32. In a specific embodiment, the mounting box 33 is designed in a rectangular shape, the size of which matches the mounting groove on the stripper plate 23. The oil storage groove 31 is arranged inside the mounting box 33, and a long rectangular second opening is formed on one side of the mounting box 33, so that the ball 32 can contact the outer side wall of the stamping head 24 through the opening. The ball 32 is evenly distributed in the oil storage groove 31, and the number is optimized according to the size and shape of the stamping head 24. The oil storage member is selected to be a sponge material or a cotton material with excellent oil absorption performance, which is placed at the bottom of the oil storage groove 31 and is in close contact with the outer surface of the ball 32.

[0055] Further, with reference to Figure 6 In some embodiments of the present application, the lubricating assembly 30 further comprises an oil inlet pipe 34, one end of which is communicated with the mounting box 33, and the other end of which is connected to an external oil storage tank. The present application further improves the lubricating assembly 30, especially by adding the element of the oil inlet pipe 34. One end of the oil inlet pipe 34 is communicated with the mounting box 33, and the other end is connected to the external oil storage tank. This design aims to realize automatic or semi-automatic replenishment of lubricating oil, ensure the continuous sufficiency of lubricating oil in the oil storage groove 31 during the stamping process, and further improve the lubricating effect and operation efficiency of the mold.

[0056] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the present application.

Claims

1. A metal press die resistant to cracking, characterized by, The utility model relates to a stamping die, which comprises: a lower die assembly comprising a base plate, a first die plate, a top material block and a second die plate, the first die plate being arranged on the base plate, the top material block being arranged in the first die plate, and the second die plate being detachably arranged on the first die plate, the second die plate having a die hole in which the top material block is located, and a stamping piece to be stamped being placed on the second die plate; and an upper die assembly being arranged above the lower die assembly in a liftable manner, the upper die assembly comprising a cover plate, a clamping plate, a stripper plate and a stamping head, the clamping plate being arranged at the lower end of the cover plate, guide columns being arranged on the clamping plate and penetrating the lower die assembly at the lower end, the stamping head being arranged on the clamping plate and corresponding in position to the top material block, the stripper plate being movably sleeved on the guide columns and located below the clamping plate, the stamping head penetrating the stripper plate, and the lower end of the stripper plate being capable of abutting against the stamping piece, the stamping head being used for blanking the stamping piece.

2. The metal punch die resistant to crack propagation according to claim 1, characterized by, The stripper plate is provided with a lubricating assembly located at the circumferential side of the stamping head, which is used for lubricating the stamping head.

3. The metal punch die resistant to crack propagation according to claim 2, characterized by, The stripper plate has a stamping hole in which the stamping head penetrates, and the circumferential wall of the stamping hole is provided with an oil storage groove, one side of the oil storage groove being provided with a first opening, the lubricating assembly comprising: a plurality of balls arranged in the oil storage groove, the balls being uniformly distributed in the oil storage groove, and the outer surfaces of the balls being capable of abutting against the outer side wall of the stamping head through the first opening; and an oil storage piece arranged at the bottom of the oil storage groove, the outer surfaces of the balls being in contact with the oil storage piece, and the oil storage piece being used for adsorbing lubricating oil.

4. The metal punch die resistant to crack propagation according to claim 3, characterized by, Adjacent balls are provided with partitions arranged in the oil storage groove.

5. The crack resistant metal stamping die of claim 4, wherein, The side surface of the partition towards the ball has a profiling part which is profiled with the ball.

6. The crack resistant metal stamping die of claim 3, wherein, The stripper plate is further provided with an oil inlet channel in communication with the oil storage groove, the oil inlet channel being used for adding lubricating oil.

7. The crack resistant metal stamping die of claim 6, wherein, The stripper plate has a stamping hole in which the stamping head penetrates, and the circumferential wall of the stamping hole is provided with a mounting groove, the lubricating assembly comprising: a mounting box mounted in the mounting groove, the mounting box being provided with an oil storage groove, one side of the oil storage groove being provided with a second opening; a plurality of balls arranged in the oil storage groove, the balls being uniformly distributed in the oil storage groove, and the balls being in contact with the outer side wall of the stamping head through the second opening; and an oil storage piece arranged in the oil storage groove, the outer surfaces of the balls being in contact with the oil storage piece, and the oil storage piece being used for adsorbing lubricating oil.

8. The crack resistant metal stamping die of claim 7, wherein, The lubricating assembly further comprises an oil inlet pipe, one end of the oil inlet pipe being in communication with the mounting box, and the other end of the oil inlet pipe being connected to an external oil storage tank.

9. The crack resistant metal stamping die of claim 3 or 7, wherein, The oil storage piece is made of cotton material.

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