A chain plate secondary fine blanking die

Abstract

A kind of chain plate secondary fine blanking die, it is related to chain plate processing die technical field, including lower die seat;First punching mechanism, second punching mechanism are arranged at the top of lower die seat;Pitch block and adjusting block are arranged between first punching mechanism and second punching mechanism;Positioning mechanism, the first punching mechanism and second punching mechanism are respectively used to carry out secondary punching to 2 chain plate holes of the chain plate to be processed, the pitch block and adjusting block are used to limit the spacing between first punching mechanism, second punching mechanism, the positioning mechanism is used to position the position of the chain plate to be punched, the pitch block and adjusting block control the spacing between first punching mechanism and second punching mechanism by adjusting the thickness of itself, the first punching mechanism, second punching mechanism, positioning mechanism are suitable for different specifications of chain plate hole blanking by changing the position of itself.

Description

TECHNICAL FIELD

[0001] The present application relates to chain plate processing die technical field, specifically relates to a kind of chain plate secondary fine blanking die. BACKGROUND

[0002] For large specification chain, engineering chain or high-precision step chain, since chain plate is thicker or chain plate is deformed after heat treatment, two hole position degree or hole diameter changes, need to be corrected after chain plate leveling Two holes of chain plate are handled, so currently large specification chain plate punching is generally punched twice.First punching is to carry out blanking pre-punching to flat steel or cold-drawn steel material, and secondary fine punching is generally corrected twice on the basis of first punching Two holes are fine punched, so as to ensure qualified hole diameter, hole center distance, bright band and roughness requirement.A kind of secondary fine blanking die in prior art can only punch one type of product, it is difficult to realize that one secondary fine blanking die is suitable for multiple types of products.With the increasing number of new types of chain plates, it is impossible to develop a new die for each chain plate, and redeveloping a new die means increasing cost and prolonging production cycle, which seriously affects the progress of delivery cycle. SUMMARY

[0003] The present application discloses a kind of chain plate secondary fine blanking die, the die can be twice fine punched for different types of chain plates by replacing punch, concave die, adjusting block, pitch block, and then solve the problem that existing secondary punching die can only be processed for one type of chain plate.

[0004] To achieve the above object, the utility model takes the following technical scheme:

[0005] A kind of chain plate secondary fine blanking die, including lower die seat;First punching mechanism, second punching mechanism are arranged at the top of lower die seat;Pitch block and adjusting block are arranged between first punching mechanism and second punching mechanism;Positioning mechanism, the first punching mechanism and the second punching mechanism are respectively used for twice punching to the 2 chain plate holes of chain plate to be processed, the pitch block and the adjusting block are used to limit the spacing between first punching mechanism and second punching mechanism, the positioning mechanism is used to position the position of chain plate to be punched, the pitch block and the adjusting block control the spacing between first punching mechanism and second punching mechanism by adjusting the thickness of itself, the first punching mechanism, second punching mechanism, positioning mechanism are suitable for different specifications of chain plate hole blanking by changing the position of itself.

[0006] Preferably, the first and second punching mechanisms are arranged side by side and have the same structure, and each of the first and second punching mechanisms comprises a lower die pad, a fixed seat, a concave die seat stripper cover, a guide sleeve, a guide sleeve pressing plate, a punch, and a punch fixed seat, the lower die pad is fixedly connected to the upper surface of the lower die seat, the fixed seat has a first L-shaped structure, the vertical section of the first L-shaped structure is fixedly connected to the lower die pad, the guide sleeve is embedded in and penetrates through the horizontal section of the first L-shaped structure, the guide sleeve pressing plate is sleeved on the top of the guide sleeve and is used for fixing the guide sleeve, the punch penetrates through the guide sleeve and is in sliding connection with the guide sleeve, the top end of the punch is fixedly connected to the punch fixed seat, and the concave die seat stripper cover is opposite to the horizontal section, and a concave die is arranged on the top end of the concave die seat stripper cover.

[0007] Preferably, the horizontal section of the first L-shaped structure is provided with a through stepped hole, the upper part of the outer wall of the guide sleeve is formed with a limiting ring through diameter expansion, the limiting ring is clamped in the large-diameter section of the upper part of the stepped hole, the small-diameter section of the stepped hole is used for limiting the guide sleeve located at the lower part of the limiting ring, the lower surface of the guide sleeve pressing plate is in abutment with the upper end of the limiting ring, the guide sleeve pressing plate is fixedly connected to the upper surface of the horizontal section of the first L-shaped structure through bolts, the guide sleeve is provided with multiple types according to the difference in the inner diameter size, and the punch is provided with multiple types according to the difference in the outer diameter size.

[0008] Preferably, the central part of the concave die seat stripper cover is provided with a mounting hole, the concave die is fixedly arranged in the mounting hole, the concave die is provided with multiple types according to the difference in the inner diameter size, the concave die seat stripper cover is divided into a concave die seat stripper cover A and a concave die seat stripper cover B through cutting along the center line, and the concave die seat stripper cover A and the concave die seat stripper cover B are fixedly connected to the lower die pad through bolts respectively.

[0009] Preferably, the top end of the lower die seat is provided with two parallel dovetail grooves in the arrangement direction of the first and second punching mechanisms, the bottom end of the lower die pad is in sliding connection with the dovetail grooves through dovetail blocks, and the lower die pad is also provided with bolt holes penetrating through the bottom ends of the dovetail blocks and is fixedly connected to the dovetail grooves through positioning bolts penetrating through the bolt holes.

[0010] Preferably, the positioning mechanism comprises a first positioning unit for positioning the length direction of the chain plate to be processed and a second positioning unit for positioning the width direction of the chain plate to be processed.

[0011] Preferably, the first positioning unit comprises side positioning fixed block one and side positioning fixed block two arranged outside the first punching mechanism or the second punching mechanism, the side positioning fixed block two is in convex structure, two wings of the convex structure are respectively provided with through waist-shaped holes, the side positioning fixed block two is fixedly connected with the lower die seat through fixing bolts penetrating through the waist-shaped holes, and the position of the side positioning fixed block two in the length direction of the chain plate to be processed is adjusted by adjusting the fastening position of the waist-shaped holes and the fixing bolts, the side positioning fixed block one abuts against the outer side end of the upper part of the convex structure and is fixedly connected with the side positioning fixed block two through bolts, the side positioning fixed block one is provided with a through first threaded hole, the side positioning fixed block two opposite to the first threaded hole is provided with a through guide hole, the side positioning fixed block two is slidably connected with a side positioning fixing piece through the guide hole, one end of the side positioning fixing piece towards the side positioning fixed block two is integrally formed with a guide rod, the guide rod is slidably connected with the guide hole, a first inner hexagonal bolt is screwed in the first threaded hole, and the end of the first inner hexagonal bolt is rotatably connected with the end of the guide rod; the position of the side positioning fixing piece in the length direction of the chain plate to be processed is adjusted by rotating the first inner hexagonal bolt.

[0012] Preferably, the side positioning fixing piece is in second L-shaped structure and the cross section is square, the lower surface of the horizontal segment of the second L-shaped structure is matched with the upper surface of the knockout cover plate of the concave die seat in height, and the position of the chain plate to be processed in the length direction is positioned by abutting against the end part of the chain plate to be processed through the outer surface of the vertical segment of the second L-shaped structure.

[0013] Preferably, the second positioning unit comprises a rear positioning fixed block and a rear positioning fixing piece, the rear positioning fixed block is also in convex structure, two wings of the convex structure are also provided with waist-shaped holes, the rear positioning fixed block is fixedly connected with the top end of the lower die seat through fixing bolts penetrating through the waist-shaped holes, and the position of the rear positioning fixed block in the length direction of the chain plate to be processed is adjusted by adjusting the relative position of the fixing bolts and the waist-shaped holes, the rear positioning fixing piece comprises an insertion plate with a rectangular cross section and a connecting seat fixedly connected with the outer side end of the insertion plate, the vertical segment of the first L-shaped structure is provided with a through sliding hole, the insertion plate penetrates through and is slidably connected with the sliding hole, the inner side end of the insertion plate is opposite to the rear edge of the chain plate to be processed, the rear positioning fixed block is provided with a through second threaded hole penetrating through the front and rear end faces, a second inner hexagonal bolt is screwed in the second threaded hole, the end of the second inner hexagonal bolt abuts against the outer surface of the connecting seat, the insertion depth of the rear positioning fixing piece 3 is adjusted by adjusting the screwing depth of the second inner hexagonal bolt, and then the position of the chain plate to be processed in the width direction is adjusted by pushing the chain plate to be processed.

[0014] Preferably, the pitch block and the adjusting block are respectively fixedly connected with the opposite ends of the two fixed seats through bolts.

[0015] The chain plate secondary fine punching die has the beneficial effects that:

[0016] The first punching mechanism and the second punching mechanism are changed in position, different specifications of pitch blocks and adjusting blocks are replaced, the positions of the first positioning unit and the second positioning unit are changed, and different specifications of the concave die, the punch pin and the sleeve are replaced, so that the secondary fine punching of the chain plate of different specifications is realized, the effect of multiple sets of molds is realized by one set of mold, the production cost is effectively reduced, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the present application, the drawings used in the embodiments are briefly introduced below, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application.

[0018] Figure 1 : The structural schematic diagram of the present application;

[0019] Figure 2 : The structural schematic diagram of the present application when the chain plate is secondary fine punched;

[0020] Figure 3 : The structural schematic diagram of the present application in the front view;

[0021] Figure 4 : The structural schematic diagram of the present application in the top view;

[0022] Figure 5 : The structural schematic diagram of the present application in the left view;

[0023] Figure 6 : The structural schematic diagram of the second positioning unit of the present application;

[0024] Figure 7 : The structural schematic diagram of the first positioning unit of the present application;

[0025] Figure 8 : The matching structural schematic diagram of the vulnerable parts (punch pin, guide sleeve, guide sleeve pressing plate, concave die) of the present application;

[0026] 1, lower die seat; 2, rear positioning fixed block; 3, rear positioning fixed part; 4, pitch block; 5, adjusting block; 6, punch pin fixed seat; 7, punch pin; 8, lower backing plate; 9, side positioning fixed block one; 10, side positioning fixed block two; 11, side positioning fixed part; 12, concave die; 13, concave die seat stripping cover plate; 13-1, concave die seat stripping cover plate A; 13-2, concave die seat stripping cover plate B; 14, guide sleeve pressing plate; 15, guide sleeve; 16, chain plate to be processed; 17, first threaded hole; 18, fixed seat; 19, second threaded hole; 20, waist-shaped hole; 21, dovetail groove; 22, positioning bolt; 23, limiting ring. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the initial embodiment, the present invention provides a chain plate secondary fine blanking die, such as... Figures 1-8 As shown, it includes a lower die base 1; a first punching mechanism and a second punching mechanism disposed at the top of the lower die base 1; a pitch block 4 and an adjusting block 5 disposed between the first punching mechanism and the second punching mechanism; and a positioning mechanism. The first punching mechanism and the second punching mechanism are respectively used to perform secondary punching on the two chain plate holes of the chain plate 16 to be processed. The pitch block 4 and the adjusting block 5 are used to limit the distance between the first punching mechanism and the second punching mechanism. The positioning mechanism is used to position the chain plate 16 to be punched. The pitch block 4 and the adjusting block 5 control the distance between the first punching mechanism and the second punching mechanism by adjusting their own thickness. The first punching mechanism, the second punching mechanism, and the positioning mechanism are suitable for punching chain plate holes of different specifications by changing their own positions.

[0029] In a further embodiment, such as Figures 1-5 As shown, the first punching mechanism and the second punching mechanism are arranged side by side and have the same structure. The first punching mechanism and the second punching mechanism respectively include a lower pad plate 8, a fixed seat 18, a die holder stripper cover plate 13, a guide sleeve 15, a guide sleeve pressure plate 14, a punch 7, and a punch fixing seat 6. The lower pad plate 8 is fixedly connected to the upper surface of the lower die holder 1. The fixed seat 18 is a first L-shaped structure. The vertical end of the first L-shaped structure is fixedly connected to the lower pad plate 8. The guide sleeve 15 is embedded in and passes through the horizontal section of the first L-shaped structure. The guide sleeve pressure plate 14 is sleeved on the top of the guide sleeve and used to fix the guide sleeve. The punch passes through the guide sleeve and is slidably connected to the guide sleeve. The top end of the punch 7 is fixedly connected to the punch fixing seat 6. The die holder stripper cover plate 13 is vertically opposite to the horizontal section. A die 12 that cooperates with the punch 7 is provided at the top end of the die holder stripper cover plate 13.

[0030] In a further embodiment, such as Figures 1-5 As shown, the horizontal section of the first L-shaped structure has a through stepped hole, such as... Figure 8As shown, the upper part of the outer wall of the guide sleeve 15 is formed with a limiting ring 23 by expanding the diameter, the limiting ring 23 is clamped in the large diameter section of the upper part of the stepped hole, the small diameter section of the stepped hole is used to limit the guide sleeve 15 located at the lower part of the limiting ring 23, the lower surface of the guide sleeve pressing plate 14 is in abutment with the upper end of the limiting ring 23, the guide sleeve pressing plate 14 is fixedly connected with the upper surface of the horizontal section of the first L-shaped structure through bolts, the guide sleeve 15 is provided with multiple models according to the difference in inner diameter size, the punch 7 is provided with multiple models according to the difference in outer diameter size, and the guide sleeve and the punch are replaced to adapt to the chain plate hole machining of chain plates of different specifications.

[0031] Further embodiments, as shown in Figure 2 , 4 As shown, the recess die holder stripping cover plate 13 is provided with a mounting hole at the center, the recess die 12 is fixedly installed in the mounting hole, the recess die 12 is provided with multiple models according to the difference in inner diameter size, the recess die holder stripping cover plate 13 is cut along the center line to divide into a recess die holder stripping cover plate A 13-1 and a recess die holder stripping cover plate B 13-2, the recess die holder stripping cover plate A and the recess die holder stripping cover plate B are fixedly connected with the lower pad respectively through bolts, in this way, different models of recess dies are replaced to adapt to the chain plate hole machining of chain plates of different specifications. The recess die holder stripping cover plate 13 in the application can not only serve as a recess die holder but also serve as a stripping cover plate, which not only saves cost but also saves space. Generally, the spacing between the recess die holder stripping cover plate A and the recess die holder stripping cover plate B is set to 2mm.

[0032] Further embodiments, as shown in Figures 1-5 As shown, the top end of the lower die holder 1 is provided with two mutually parallel dovetail grooves 21 along the arrangement direction of the first punching mechanism and the second punching mechanism, the bottom end of the lower pad 8 is slidably connected with the dovetail grooves 21 through dovetail blocks, the lower pad 8 is also provided with bolt holes penetrating the bottom end of the dovetail blocks, and is fixedly opposite to the dovetail grooves 21 through positioning bolts 22 penetrating the bolt holes. The relative positions of the first punching mechanism and the second punching mechanism are adjusted by moving the position of the lower pad to adapt to the chain plate hole machining of chain plates of different specifications.

[0033] Further embodiments, as shown in Figures 1-8 As shown, the positioning mechanism includes a first positioning unit for positioning the length direction of the chain plate 16 to be machined and a second positioning unit for positioning the width direction of the chain plate 16 to be machined.

[0034] Further embodiments, as shown in Figures 1-8As shown, the first positioning unit includes side positioning fixed block one 9 and side positioning fixed block two 10 arranged outside the first punching mechanism or the second punching mechanism. The side positioning fixed block two 10 is a convex structure, and two wings of the convex structure are respectively provided with a through waist-shaped hole 20. The side positioning fixed block two 10 is fixedly connected with the lower die seat 1 through a fixing bolt penetrating through the waist-shaped hole 20, and the position of the side positioning fixed block two 10 along the length direction of the chain plate 16 to be processed is adjusted by adjusting the fastening position of the waist-shaped hole 20 and the fixing bolt, so as to be suitable for chain plate hole processing of chain plates of different specifications. The side positioning fixed block one 9 abuts against the outer side end of the upper part of the convex structure and is fixedly connected with the side positioning fixed block two 10 through a bolt. The side positioning fixed block one 9 is provided with a through first threaded hole 17. The side positioning fixed block two 10 opposite to the first threaded hole 17 is provided with a through guide hole. The side positioning fixed block two 10 is slidingly connected with a side positioning fixing piece 11 through the guide hole. One end of the side positioning fixing piece 11 towards the side positioning fixed block two 10 is integrally formed with a guide rod. The guide rod is slidingly connected with the guide hole. A first inner hexagonal bolt is screwed in the first threaded hole 17. The end of the first inner hexagonal bolt is rotationally connected with the end of the guide rod. The position of the side positioning fixing piece 11 along the length direction of the chain plate 16 to be processed is adjusted by screwing the first inner hexagonal bolt, so as to finely adjust the position of the chain plate to be processed along the length direction.

[0035] In further embodiments, as shown in Figures 1-8 The side positioning fixing piece 11 is a second L-shaped structure, and the cross section is square. The lower surface of the horizontal segment of the second L-shaped structure matches the height of the upper surface of the concave die seat ejection cover plate 13. The end of the chain plate 16 to be processed is abutted against the outer surface of the vertical segment of the second L-shaped structure, so as to position the position of the chain plate 16 to be processed along the length direction, so as to ensure the accuracy of the punching position.

[0036] In further embodiments, the second positioning unit includes a rear positioning fixed block 2 and a rear positioning fixing piece 3. The rear positioning fixed block 2 is also a convex structure, and two wings of the convex structure are also provided with a waist-shaped hole 20. The rear positioning fixed block 2 is fixedly connected with the top end of the lower die seat 1 through a fixing bolt penetrating through the waist-shaped hole 20, and the position of the rear positioning fixed block 2 along the length direction of the chain plate 16 to be processed is adjusted by adjusting the relative position of the fixing bolt and the waist-shaped hole 20, so as to adapt to chain plate hole processing of chain plates of different specifications. The rear positioning fixing piece 3 includes a rectangular insertion plate and a connecting seat fixedly connected to the outer side end of the insertion plate. As shown in Figure 3 、 5As shown in Figure 6, the vertical section of the first L-shaped structure is provided with a through sliding hole. The insert plate passes through the sliding hole and is slidably connected to the sliding hole. The inner end of the insert plate is opposite to the rear edge of the chain plate 16 to be processed. The rear positioning and fixing block 2 is provided with a second threaded hole 19 that passes through the front and rear end faces. A second internal hexagon bolt is screwed into the second threaded hole 19. The end of the second internal hexagon bolt abuts against the outer surface of the connecting seat. The insertion depth of the rear positioning and fixing part 3 is adjusted by adjusting the screwing depth of the second internal hexagon bolt, and then the position of the chain plate to be processed 16 in the width direction is adjusted by pushing the chain plate to be processed.

[0037] In a further embodiment, such as Figures 1-5 As shown, the pitch block 4 and the adjusting block 5 are fixedly connected to the opposite ends of the two fixed seats by bolts.

[0038] Working principle of the invention:

[0039] The lower pad of the present invention can adjust its position along the dovetail groove, thereby realizing the adjustment of the distance between the first punching mechanism and the second punching mechanism, and thus adapting to the chain plate hole processing of chain plates with different hole center distances. At the same time, the lower pad is fixed relative to the dovetail groove by positioning bolts, and the first punching mechanism and the second punching mechanism are fixed relative to each other by pitch block and adjustment block, ensuring the stability of their relative positions.

[0040] In summary, this invention achieves secondary precision punching of chain plates of different specifications by changing the positions of the first and second punching mechanisms, replacing pitch blocks and adjusting blocks of different specifications, changing the positions of the first and second positioning units, and replacing dies, punches, and sleeves of different specifications. It achieves the effect of multiple sets of dies with a single set of dies.

Claims

1. A secondary fine blanking die for a chain plate, characterized in that: The system includes a lower die base; a first punching mechanism and a second punching mechanism located at the top of the lower die base; a pitch block and an adjusting block located between the first punching mechanism and the second punching mechanism; and a positioning mechanism. The first punching mechanism and the second punching mechanism are respectively used to perform secondary punching on two chain plate holes of the chain plate to be processed. The pitch block and the adjusting block are used to limit the distance between the first punching mechanism and the second punching mechanism. The positioning mechanism is used to position the chain plate to be punched. The pitch block and the adjusting block control the distance between the first punching mechanism and the second punching mechanism by adjusting their own thickness. The first punching mechanism, the second punching mechanism, and the positioning mechanism are suitable for punching chain plate holes of different specifications by changing their own positions. The first punching mechanism and the second punching mechanism are arranged side by side and have the same structure. The first punching mechanism and the second punching mechanism respectively include a lower pad, a fixed seat, a die holder stripper cover, a guide sleeve, a guide sleeve pressure plate, a punch, and a punch fixing seat. The lower pad is fixedly connected to the upper surface of the lower die holder. The fixed seat is a first L-shaped structure. The vertical end of the first L-shaped structure is fixedly connected to the lower pad. The guide sleeve is embedded in and passes through the horizontal section of the first L-shaped structure. The guide sleeve pressure plate is sleeved on the top of the guide sleeve and used to fix the guide sleeve. The punch passes through the guide sleeve and is slidably connected to the guide sleeve. The top end of the punch is fixedly connected to the punch fixing seat. The die holder stripper cover is vertically opposite to the horizontal section. A die is provided at the top of the die holder stripper cover for use with the punch.

2. The chain plate secondary fine blanking die as described in claim 1, characterized in that: The horizontal section of the first L-shaped structure has a through stepped hole. The upper part of the outer wall of the guide sleeve is expanded to form a limiting ring. The limiting ring is engaged in the large-diameter section of the upper part of the stepped hole. The small-diameter section of the stepped hole is used to limit the guide sleeve located below the limiting ring. The lower surface of the guide sleeve pressure plate abuts against the upper end of the limiting ring. The guide sleeve pressure plate is fixedly connected to the upper surface of the horizontal section of the first L-shaped structure by bolts. The guide sleeve has various models according to the difference in inner diameter. The punch has various models according to the difference in outer diameter.

3. The chain plate secondary fine blanking die as described in claim 2, characterized in that: The die holder stripper cover has a mounting hole in the center, and the die is fixedly installed in the mounting hole. The die has various models according to the difference in inner diameter. The die holder stripper cover is divided into die holder stripper cover A and die holder stripper cover B by cutting along the center line. Die holder stripper cover A and die holder stripper cover B are respectively fixedly connected to the lower pad by bolts.

4. The chain plate secondary fine blanking die as described in claim 3, characterized in that: The lower die base has two parallel dovetail grooves at its top along the arrangement direction of the first punching mechanism and the second punching mechanism. The bottom end of the lower pad is slidably connected to the dovetail grooves via a dovetail block. The lower pad is also provided with a bolt hole that passes through the bottom end of the dovetail block and is fixed relative to the dovetail groove by a positioning bolt passing through the bolt hole.

5. The chain plate secondary fine blanking die as described in claim 4, characterized in that: The positioning mechanism includes a first positioning unit for positioning the chain plate to be processed along its length and a second positioning unit for positioning the chain plate to be processed along its width.

6. The chain plate secondary fine blanking die as described in claim 5, characterized in that: The first positioning unit includes a first lateral positioning block and a second lateral positioning block located outside the first or second punching mechanism. The second lateral positioning block has a convex structure, with through-holes on both wings. The second lateral positioning block is fixedly connected to the lower die base by bolts passing through the through-holes. The position of the second lateral positioning block along the length of the chain plate to be processed can be adjusted by adjusting the tightness of the through-holes and the bolts. The first lateral positioning block rests against the outer end of the upper part of the convex structure and is fixedly connected to the second lateral positioning block by bolts. The first side positioning fixing block is provided with a through first threaded hole, and the second side positioning fixing block opposite to the first threaded hole is provided with a through guide hole. The second side positioning fixing block is slidably connected to a side positioning fixing component through the guide hole. The end of the side positioning fixing component facing the second side positioning fixing block is integrally formed with a guide rod. The guide rod is slidably connected to the guide hole. A first internal hex bolt is screwed into the first threaded hole. The end of the first internal hex bolt is rotatably connected to the end of the guide rod. The position of the side positioning fixing component along the length direction of the chain plate to be processed can be adjusted by turning the first internal hex bolt.

7. The chain plate secondary fine blanking die as described in claim 6, characterized in that: The lateral positioning fastener is a second L-shaped structure with a square cross-section. The lower surface of the horizontal section of the second L-shaped structure is matched with the upper surface of the stripper cover plate of the die seat at the same height. The position of the end of the chain plate to be processed against the chain plate to be processed is determined by the outer surface of the vertical section of the second L-shaped structure.

8. The chain plate secondary fine blanking die as described in claim 7, characterized in that: The second positioning unit includes a rear positioning fixing block and a rear positioning fixing component. The rear positioning fixing block is also a convex structure, and the two wings of the convex structure are also provided with waist-shaped holes. The rear positioning fixing block is fixedly connected to the top of the lower mold base by fixing bolts passing through the waist-shaped holes. The position of the rear positioning fixing block along the length direction of the chain plate to be processed can be adjusted by adjusting the relative position of the fixing bolts and the waist-shaped holes. The rear positioning fixing component includes a rectangular insert plate and a connecting seat fixedly connected to the outer end of the insert plate. The vertical section of the first L-shaped structure is provided with a through sliding hole. The insert plate passes through the sliding hole and is slidably connected to the sliding hole. The inner end of the insert plate is opposite to the rear edge of the chain plate to be processed. The rear positioning fixing block is provided with a second threaded hole that passes through the front and rear end faces. A second internal hexagon bolt is screwed into the second threaded hole. The end of the second internal hexagon bolt abuts against the outer surface of the connecting seat. The insertion depth of the rear positioning fixing component is adjusted by adjusting the screwing depth of the second internal hexagon bolt, and then the position of the chain plate to be processed in the width direction is adjusted by pushing the chain plate to be processed.

9. A chain plate secondary fine blanking die as described in claim 8, characterized in that: The pitch block and the adjusting block are respectively fixedly connected to the opposite ends of the two fixed seats by bolts.

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