A punch fixing structure and a blanking die comprising the same

Abstract

The utility model discloses a male die fixed structure and contain its blanking die, including second male die fixed block, second punch male die and second unloading block, second male die fixed block has the fixed portion who is located second unloading block upper end and with upper pad fixed connection and the installation portion who extends into second unloading block inside, the installation portion has with second punch male die cooperation's second limit hole, and installation portion is fixedly connected with second punch male die, the clearance is left between the inner wall of second unloading block and second punch male die. The utility model will second punch male die be fixed on second male die fixed block, and will second male die fixed block extend to second unloading block, and the orientation is carried out to second punch male die by second male die fixed block, and second punch male die has the clearance with second unloading block, and second unloading block only plays the role of unloading and pressing material, and the precision of second punch male die is not influenced by the abrasion of second unloading block in the punching process.

Description

Technical Field

[0001] This utility model relates to the field of mold design technology, and in particular to a punch fixing structure and a punching die including the punch. Background Technology

[0002] Figure 1 The image shows a car battery housing. Due to the high demand for this product, the top cavity requires high precision in burr removal. When using progressive dies for mass automated production, quality problems easily arise in the top cavity, such as large burrs, uneven gaps, and cavity deformation. These issues occur frequently, leading to low production efficiency. In addition, the housing material is thin, the clearance between the punch and die is small, the punch length is long and difficult to process, the first stripper block has high clearance requirements, wears out quickly, and the operating cost remains high. In some cases, it can even lead to serious consequences such as delivery delays.

[0003] Figure 2 and Figure 3 The diagram shows a traditional mold design. The upper mold consists of a first punch 17, which is fixed to the upper plate 1 by a first punch fixing block 19. The first punch fixing block 19 has a small clearance fit with the upper fixing plate 2 and is prevented from rotating by an anti-rotation pin. The first stripper block 16 has a small clearance fit with the first punch 17 and the fixed crossbeam 5. To ensure the accuracy during punching, only the first punch 17 and the first punch fixing block 19 have a certain clearance. The first stripper block 16 serves as a guide and stripper during punching. The lower mold consists of a punch die 15 and a die positioning post 13 connected by pins and screws. The die positioning post 13 has a square fixed end that is embedded in the square cavity of the lower fixing plate 9, also with a small clearance fit. The working principle is as follows: The upper die, fixed on the table of the punch press, moves downward under the action of the slide block on the punch press, causing the upper and lower dies to gradually close. During the closing process, the first upper ejector 4 first contacts the lower stripper plate 7. Since the spring behind the first upper ejector 4 has a greater force than the spring under the lower ejector 12, when the first upper ejector 4 contacts the lower stripper plate 7, it begins to compress the lower stripper plate 7 and the lower ejector 12 to move downward. Then, the punching die 15 and the die positioning pin 13 will be exposed on the lower stripper plate 7. When the first stripper block 16 contacts the top of the workpiece 21 placed on the lower stripper plate 7, it presses down the workpiece 21 and the lower stripper plate 7. The material plate 7 moves downward together, and the second upper ejector 18 behind the first ejector block 16 also compresses upward at the same time until the lower surface of the lower ejector plate 7 is in close contact with the lower fixed plate 9, and the inner surface of the top of the workpiece 21 is in close contact with the upper surface of the punching die 15. Then the punch continues to move downward, and the first punching punch 17 will pass through the workpiece 21 and enter the cavity of the punching die 15. At this time, the hole on the upper surface of the workpiece 21 has been punched, and the punch has reached the bottom dead center. Then, after the punch slide has completed half a stroke, it begins to move upward, and then drives the upper die upward, gradually reversing to open the die to the top dead center to complete one stroke.

[0004] Under normal circumstances, when the upper die moves downward, the first punch 17 will smoothly pass through the top surface of the workpiece 21 and enter the punch die 15. There is a reasonable gap between the first punch 17 and the punch die 15, and there will be no collision between the first punch 17 and the punch die 15, which is the so-called "biting edge". This is under the premise that the clearance between the first stripper block 16 and the fixed crossbeam 5 is reasonable and there is no wear. However, due to the large production volume and continuous production, the gap between the first stripper block 16 and the fixed crossbeam 5 will gradually wear and increase during the up and down movement. After the gap increases, the first punch 17, which is guided by the first stripper block 16, will lose its guiding accuracy. At this time, the first punch 17, which has lost its guiding accuracy, will collide with the punch die 15 during punching, resulting in the "biting edge" phenomenon. Large burrs will appear in the top cavity of workpiece 21. In severe cases, the top of workpiece 21 will deform, causing serious defects. At the same time, the first punch 17 and punch die 15 will also be damaged. To restore the product quality, new punch dies and first stripper block must be replaced, and even the fixed crossbeam may need to be replaced. The maintenance cost is huge, and the product quality cannot be guaranteed.

[0005] In addition, the first punch 17 in the prior art is limited and installed using a protruding mounting plate 1701 as shown in the figure, such as Figure 4 As shown, the lower end of the first punch 17 is inserted from the upper end of the first punch fixing block 19, and the protruding mounting plate 1701 abuts against the first limiting hole 1901 of the first punch fixing block 19. The first punch 17 mainly relies on the guide hole 1601 in the first unloading block 16 for guidance and movement. This results in the first punch 17 having a relatively long overall length, and the first punch 17 only has one end of the cutting edge used for punching, resulting in a short service life. Utility Model Content

[0006] In order to solve the technical problem in the prior art that the first punching punch in the punching die is completely guided by the first stripper block and the first stripper block is easy to wear, which causes the first punching punch to collide with the punching die and the punched cavity to produce large burrs, this utility model provides a punch fixing structure and a punching die including the same to solve the above problems.

[0007] This utility model proposes a punch fixing structure, including a second punch fixing block, a second punching punch, and a second unloading block. The second punch fixing block has a fixing part located at the upper end of the second unloading block and fixedly connected to an upper pad, and an mounting part extending into the interior of the second unloading block. The mounting part has a second limiting hole that cooperates with the second punching punch, and the mounting part is fixedly connected to the second punching punch. A gap is left between the inner wall of the second unloading block and the second punching punch.

[0008] In an optional embodiment of this utility model, the outer surface of the second punching punch is provided with a transversely extending groove, and the mounting part has a pin hole for inserting a transverse pin. The transverse pin is inserted into both the groove and the pin hole to fix the second punching punch to the second punch fixing block.

[0009] In an optional embodiment of this utility model, the distance from the transverse groove to both ends of the second punching punch is less than or equal to the distance from the pin hole to the upper end of the second limiting hole.

[0010] In an optional embodiment of this utility model, the second punch fixing block includes an upper fixing seat and a lower fixing block, the fixing part is located on the upper part of the upper fixing seat, and the lower part of the upper fixing seat and the lower fixing block form a mounting part; the second limiting hole is located inside the lower fixing block.

[0011] In an optional embodiment of this utility model, the lower part of the upper fixing seat has a pin hole and a threaded hole that are fitted together with the lower fixing block.

[0012] In an optional embodiment of this utility model, the number of the cross pins is 2 to 4.

[0013] In an optional embodiment of this utility model, the maximum outer diameter of the second unloading block and the mounting part are equal.

[0014] In an optional embodiment of this utility model, the outer surfaces of the second unloading block and the mounting part both have anti-rotation grooves extending axially to both ends.

[0015] In an optional embodiment of this utility model, the second unloading block includes a hollow cylinder and a baffle extending from the inner surface of the cylinder to the center. The inner diameter of the cylinder is larger than the outer diameter of the workpiece, and a gap is left between the inner surface of the baffle and the second punch.

[0016] In an optional embodiment of this utility model, the inner hole shape of the baffle is the same as the cross-sectional shape of the second punch.

[0017] This utility model also proposes a punching die, including an upper die assembly and a lower die assembly, wherein the upper die assembly includes the punch fixing structure described above.

[0018] The beneficial effects of this utility model are: (1) In this utility model, the second punch is fixed on the second punch fixing block and the second punch fixing block is extended into the second unloading block. The second punch is guided by the second punch fixing block. The second unloading block is separated from the second punch. The second unloading block only plays the role of unloading and pressing. In this way, the accuracy of the second punch is not affected by the wear of the second unloading block during the punching process.

[0019] (2) In this utility model, the second punch and the second punch fixing block are fixed by a horizontal pin, which makes the processing difficult and both ends of the second punch can be used as cutting heads, thereby reducing the cost of use.

[0020] (3) This utility model shortens the length of the second punch, which is prone to wear, thereby greatly reducing the cost of raw materials and processing costs. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a diagram showing the exterior of the car's onboard power supply housing. Figure 2 This is a schematic diagram of a stamping die in the open state. Figure 3 This is a schematic diagram of a stamping die in the closed state in the existing technology. Figure 4 This is a diagram showing the components of the punch fixing structure in existing blanking dies; Figure 5 This is an overall view of the punch fixing structure described in this utility model; Figure 6 This is a diagram showing the components of the punch fixing structure described in this utility model; Figure 7 This is a schematic diagram of the blanking die of this utility model in the open state; Figure 8 yes Figure 7 Enlarged view of point a in the middle; Figure 9 This is a schematic diagram of the blanking die of this utility model in the closed state; Figure 10 yes Figure 9 Enlarged view of section b in the middle.

[0023] In the diagram, 1. Upper pad, 2. Upper fixing plate, 3. Second punch fixing block, 301. Upper fixing seat, 302. Lower fixing block, 3021. Second limiting hole, 4. First upper ejector rod, 5. Fixed crossbeam, 6. Threaded hole, 7. Lower stripper plate, 8. Second punching punch, 9. Lower fixing plate, 10. Second stripper block, 1001. Cylinder, 1002. Baffle, 1003. Limiting ring, 11. Lower pad, 12. Lower ejector rod, 13. Die. 14. Positioning pin, 15. Anti-rotation groove, 16. Punching die, 17. First unloading block, 18. Guide hole, 19. First punch, 10. Protruding mounting platform, 11. Second upper ejector pin, 12. First punch fixing block, 13. First limiting hole, 24. Pin hole, 25. Workpiece, 26. Top cavity, 27. Fixing part, 28. Mounting hole, 29. Mounting part, 20. Horizontal groove, 21. Horizontal pin, 22. Pin hole. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be understood that, compared with the old and new blanking dies, only the structure and cooperation relationship of three components—the punching punch, the punch fixing block, and the stripper block—have changed. The cooperation relationship of the remaining structures has not changed. Therefore, this utility model only distinguishes the names of the above three components in the old and new blanking dies. In the old blanking die, they are named "first punching punch 17", "first punch fixing block 19", and "first stripper block 16", respectively. In the new blanking die, they are named "second punching punch 8", "second punch fixing block 3", and "second stripper block 10", respectively. The remaining components use the same component names in the old and new blanking dies.

[0026] Example 1 like Figures 5-6 As shown, a punch fixing structure includes a second punch fixing block 3, a second punching punch 8, and a second unloading block 10. The second punch fixing block 3 has a fixing part 22 located at the upper end of the second unloading block 10 and fixedly connected to the upper pad 1, and an mounting part 23 extending into the interior of the second unloading block 10. The mounting part 23 has a second limiting hole 3021 that cooperates with the second punching punch 8, and the mounting part 23 is fixedly connected to the second punching punch 8. A gap is left between the inner wall of the second unloading block 10 and the second punching punch 8.

[0027] Compared to the first punch fixing block 19 in the old punching die, this invention is less prone to "biting" of the cutting edge. The second punch fixing block 3 in this invention is not only located at the end of the second stripper block 10, but also has a mounting part 23 extending into the second stripper block 10. This mounting part 23 guides and fixes the second punching punch 8. The gap between the second stripper block 10 and the second punching punch 8 is made "sufficiently large," so that the second stripper block 10 only functions as a stripper and presser, without guiding. Therefore, the accuracy of the second punching punch 8 is not affected by the second stripper block 10 during the punching process. Wear on the second stripper block 10 and the fixed crossbeam 5 becomes insignificant, eliminating the need for frequent replacements, reducing costs, and ensuring product quality and production efficiency. "Sufficiently large" means that the gap between the second stripper block 10 and the second punching punch 8 is larger than the gap between the worn fixed crossbeam 5 and the second stripper block 10. In this case, deformation of the second stripper block 10 will not affect the punching accuracy of the second punching punch 8. Secondly, this invention can shorten the length of the second punch fixing block 3, such as... Figure 8 As shown, the second limiting hole 3021 is relatively short, and the second punch fixing block 3 only extends a short distance beyond the second limiting hole 3021, thereby reducing raw material costs and processing costs.

[0028] The second punch fixing block 3 can be a one-piece structure. However, for ease of installation, the second punch fixing block 3 in this embodiment adopts a split structure, such as... Figures 6-8 As shown, the second punch fixing block 3 includes an upper fixing seat 301 and a lower fixing block 302. The top fixing part 22 is located on the upper part of the upper fixing seat 301, and the lower part of the upper fixing seat 301 and the lower fixing block 302 form a mounting part 23. The second limiting hole 3021 is located inside the lower fixing block 302. During installation, the upper fixing seat 301 is located at the top, and the top fixing part 22 on the upper fixing seat 301 has multiple mounting holes 2201 that are fixed to the upper pad 1 by screws. The lower fixing block 302 is located at the bottom of the upper fixing seat 301. The upper fixing seat 301 and the lower fixing block 302 are fixed together. The second punching punch 8 is located at the bottom. The second punching punch 8 is inserted through the lower surface of the lower fixing block 302 and fixed. After installation, it is inserted into the second unloading block 10 from below. The second unloading block 10 plays the role of pressing (pressing the workpiece 21) and unloading.

[0029] The upper fixing seat 301 and the lower fixing block 302 can be fixed in the following ways, but not limited to: the lower part of the upper fixing seat 301 has a pin hole 20 and a threaded hole 6 that are installed in conjunction with the lower fixing block 302; the lower fixing block 302 and the upper fixing seat 301 are connected end to end; the pin on the lower fixing block 302 passes through the pin hole 20 to achieve initial fixation; and the screw passes through the threaded hole 6 of the upper fixing seat 301 from the bottom of the lower fixing block 302 to fix it.

[0030] Second unloading block 10: like Figure 6 and Figure 10 As shown, the second unloading block 10 includes a hollow cylinder 1001 and a baffle 1002 extending from the inner surface of the cylinder 1001 towards the center. The inner diameter of the cylinder 1001 is larger than the outer diameter of the workpiece 21. During the mold closing process, the workpiece 21 can enter the interior of the cylinder 1001. A gap is left between the inner surface of the baffle 1002 and the second punch 8. The baffle 1002 is used for pressing the material. In the prior art punching die, the guide hole 1601 in the first unloading block 16 is an axially penetrating elongated hole used to guide the first punching punch 17. Therefore, its material-blocking part is a boss surface located at the end of the first unloading block 16, and the outer diameter of the material-blocking part is larger than the inner diameter of the first unloading block 16. In this utility model, the second unloading block 10 is only used for unloading and pressing. Therefore, the interior of the second unloading block 10 is hollowed out. The baffle 1002 used for material blocking is a relatively thin plate structure and is set near the lower end of the second unloading block 10. The inner diameter of the cylinder 1001 of the second unloading block 10 is large, and there is a large gap between it and the lower fixed plate 9 and the second punching punch 8.

[0031] The inner hole shape of the baffle 1002 is preferably the same as the cross-sectional shape of the second punch 8, but the size is larger, so as to form a radial gap between the two. The design of the same cross-sectional shape is to avoid uneven force caused by large gap differences at different angles.

[0032] The upper end of the cylinder 1001 of the second unloading block 10 is usually provided with a limiting ring 1003. The outer diameter of the limiting ring 1003 is larger than the outer diameter of the cylinder 1001. It is used to limit the internal step of the fixed crossbeam 5 and limit the maximum distance of the second unloading block 10 moving downward, so as to prevent the second unloading block 10 from detaching from the fixed crossbeam 5.

[0033] like Figure 7 and Figure 9 As shown, the second unloading block 10 needs to move between the fixed crossbeam 5 and the upper fixed plate 2. Therefore, it is preferable that the maximum outer diameter of the second unloading block 10 and the mounting part 23 are equal, that is, the outer diameter of the limiting ring 1003 and the mounting part 23 are equal. Typically, the outer surfaces of the second unloading block 10 and the mounting part 23 both have anti-rotation grooves 14 extending axially to both ends to prevent rotation between the second unloading block 10 and the upper fixed plate 2, and between the mounting base and the upper fixed plate 2.

[0034] Example 2 Based on Embodiment 1, this embodiment improves the fixing method between the second punch fixing block 3 and the second punching punch 8. In this embodiment, the outer surface of the second punching punch 8 is provided with a transversely extending transverse groove 24, and the mounting part 23 has a pin hole 26 for inserting a transverse pin 25. The transverse pin 25 is inserted into both the transverse groove 24 and the pin hole 26 to fix the second punching punch 8 to the second punch fixing block 3. Figure 6 As shown, the transverse groove 24 is located on both sides of the second punching punch 8. During installation, the second punching punch 8 is inserted into the second limiting hole 3021 from the bottom of the lower fixing block 302, and then the transverse pin 25 is inserted.

[0035] Compared to the existing technology that uses a protruding upper mounting platform 1701 for limiting, this embodiment can further shorten the length of the second punching die 8. Furthermore, as long as there is sufficient installation space, the second punching die 8 can be installed in reverse, meaning both ends of the second punching die 8 can serve as cutting edges, thereby extending its service life. The sufficient installation space refers to the transverse groove 24 reaching the same height as the pin hole 26. Specifically, the distance from the transverse groove 24 to both ends of the second punching die 8 is less than or equal to the distance from the pin hole 26 to the upper end of the second limiting hole 3021.

[0036] The number of horizontal pins 25 is preferably 2 to 4. In this embodiment, there are two horizontal slots 24, two horizontal pins 25 and two pin holes 26.

[0037] Example 3 A punching die includes an upper die assembly and a lower die assembly, wherein the upper die assembly includes the punch fixing structure described above. This invention only improves the connection structure between the punching punch, the stripper block, and the punch fixing block in the upper die assembly; other structures are the same as described above. Figure 2 and Figure 3 The old blanking die structure includes an upper die assembly comprising an upper pad 1, an upper fixing plate 2, and a fixing beam 5 arranged from top to bottom. The upper pad 1 is fixed to the upper fixing plate 2, and the fixing beam 5 is fixed to the upper fixing plate 2. The lower die assembly includes a lower pad 11 and a lower fixing plate 9 fixed to the top of the lower pad 11. Figures 7-10 As shown, the punch fixing structure is located within the upper fixing plate 2 and the fixing crossbeam 5.

[0038] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0040] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0041] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A punch fixing structure, characterized in that: The assembly includes a second punch fixing block (3), a second punching punch (8), and a second unloading block (10). The second punch fixing block (3) has a fixing part (22) located at the upper end of the second unloading block (10) and fixedly connected to the upper pad (1), and an installation part (23) extending into the interior of the second unloading block (10). The installation part (23) has a second limiting hole (3021) that cooperates with the second punching punch (8), and the installation part (23) is fixedly connected to the second punching punch (8). A gap is left between the inner wall of the second unloading block (10) and the second punching punch (8).

2. The punch fixing structure according to claim 1, characterized in that: The outer surface of the second punch (8) is provided with a transversely extending groove (24), and the mounting part (23) has a pin hole (26) for inserting a horizontal pin (25). The horizontal pin (25) is inserted into both the groove (24) and the pin hole (26) to fix the second punch (8) to the second punch fixing block (3).

3. The punch fixing structure according to claim 2, characterized in that: The distance from the transverse groove (24) to both ends of the second punching punch (8) is less than or equal to the distance from the pin hole (26) to the upper end of the second limiting hole (3021).

4. The punch fixing structure according to claim 1, characterized in that: The second punch fixing block (3) includes an upper fixing seat (301) and a lower fixing block (302). The fixing part (22) is located on the upper part of the upper fixing seat (301), and the lower part of the upper fixing seat (301) and the lower fixing block (302) form a mounting part (23); the second limiting hole (3021) is located inside the lower fixing block (302).

5. The punch fixing structure according to claim 4, characterized in that: The lower part of the upper fixing seat (301) has a pin hole (20) and a threaded hole (6) that are installed in conjunction with the lower fixing block (302).

6. The punch fixing structure according to claim 1, characterized in that: The second unloading block (10) and the mounting part (23) have the same maximum outer diameter.

7. The punch fixing structure according to claim 6, characterized in that: The outer surfaces of the second unloading block (10) and the mounting part (23) both have anti-rotation grooves (14) extending axially to both ends.

8. The punch fixing structure according to claim 1, characterized in that: The second unloading block (10) includes a hollow cylinder (1001) and a baffle (1002) extending from the inner surface of the cylinder (1001) toward the center. The inner diameter of the cylinder (1001) is larger than the outer diameter of the workpiece (21). There is a gap between the inner surface of the baffle (1002) and the second punch (8).

9. The punch fixing structure according to claim 8, characterized in that: The inner hole shape of the baffle (1002) is the same as the cross-sectional shape of the second punch (8).

10. A blanking die, characterized in that: It includes an upper module and a lower module, wherein the upper module includes the punch fixing structure as described in any one of claims 1-9.

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