Multi-step stamping die and forming method for wire harness protection cover plate on inner side of automobile instrument desk

Abstract

The invention discloses an automobile instrument desk inner side wire harness protection cover plate multi-step stamping die and a forming method.The automobile instrument desk inner side wire harness protection cover plate multi-step stamping die comprises a material plate unit and a stamping die, the stamping die comprises a first pressing die set, a second pressing die set, a third pressing die set and a fourth pressing die set which are arranged side by side, and the material plate unit is formed by stamping a stamped plate through the first pressing die set; tandem type guiding and transferring devices are arranged between the pressing die sets, and the material plate unit sequentially passes through the first pressing die set, the second pressing die set, the third pressing die set and the fourth pressing die set through the tandem type guiding and transferring devices and sequentially carries out four continuous punching operations including discharging and shaping, punching and bending, preliminary forming and complete forming. A series stamping module and a series guide transfer device are arranged between adjacent processing steps, so that continuous and ordered stamping forming of the material plate is realized; by integrating the bending and punching procedures, the procedures are integrated, and the machining efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of automotive parts stamping dies and stamping forming technology, and more specifically, it relates to a multi-step stamping die and forming method for a protective cover plate for the inner side wiring harness of an automotive dashboard. Background Technology

[0002] As a critical protective component inside the vehicle, the wiring harness protective cover inside the dashboard requires high precision in forming and structural regularity. Its stamping process directly determines the component's performance. Current technologies for stamping such covers often employ a step-by-step, discrete operation, with each stamping process using independently set modules. This lack of a coherent guiding and transfer connection structure leads to positional deviations in the material sheet during inter-process transfer, making it difficult to guarantee consistency in subsequent stamping. Furthermore, the material sheet positioning and clamping structure is poorly designed, only achieving clamping and limiting in a single direction. This fails to accommodate the stress requirements arising from differences in the length and width of the cover sheet, causing deformation during stamping and affecting subsequent bending and forming effects. Simultaneously, existing stamping processes often perform bending and punching processes separately, requiring multiple positioning and transfer operations. This not only increases processing time but also generates cumulative errors due to repeated positioning, making it difficult to match the hole accuracy and bending curvature of the cover sheet to design standards. Ultimately, neither overall processing efficiency nor forming quality can be balanced, making it unsuitable for mass production needs. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a multi-step stamping die and forming method for the inner wiring harness protective cover of the automotive dashboard. By setting up a series stamping die and a series guiding and transferring device between adjacent processing steps, the continuous and orderly stamping and forming of the material plate is realized; by integrating the bending and punching processes, the processing efficiency is improved through process integration.

[0004] Technical Solution: To achieve the above objectives, the present invention provides a multi-step stamping die for the inner wiring harness protective cover of an automotive dashboard, comprising a material plate unit and a stamping die. The stamping die includes a first die group, a second die group, a third die group, and a fourth die group arranged side by side. The material plate unit is stamped by the first die group from the stamped plate. A series-connected guiding and transfer device is provided between each die group. The material plate unit passes through the first die group, the second die group, the third die group, and the fourth die group in sequence via the series-connected guiding and transfer device, and sequentially performs four continuous stamping operations: blanking and shaping, punching and bending, preliminary forming, and complete forming.

[0005] Furthermore, the first pressure die assembly includes a first lower pressure seat and a first upper pressure seat. A first lower pad is fixedly connected to the first lower pressure seat via several lower die feet. A first lower pressing platform is fixed in the central area of ​​the first lower pad away from the first lower pressure seat. A first lower punch is fixed in the central area of ​​the first lower pressing platform away from the first lower pad. A feeding platform is slidably arranged on one side of the first lower pressing platform along the length direction of the first lower punch. In the initial state, the upper surface of the feeding platform is coplanar with the upper surface of the first lower punch. A first upper pressing platform is arranged in the central area of ​​one side of the first upper pressure seat corresponding to the first lower pressing platform. A first upper die is arranged in the central area of ​​the first upper pressing platform away from the first upper pressure seat corresponding to the first lower punch. Several ejector pins are arranged in the first upper pressing platform, and each ejector pin is located in the area where the first upper die is located.

[0006] Furthermore, a first guide post is provided on the first lower pad, a first guide sleeve is provided on the first upper pressure seat corresponding to the first guide post, a first lower limit post is provided on the first lower pad, a first upper limit post is provided on the first upper pressure seat corresponding to the first lower limit post, guide rods are provided at the four corners of the side of the first lower punch of the first lower pressure table, and guide grooves are provided at the four corners of the side of the first upper die of the first upper pressure table corresponding to the guide rods. In the assembled state, each of the first guide posts is slidably engaged in the first guide sleeve on the same axis, and each of the guide rods is slidably engaged in the guide groove on the same axis. The first lower limit post and the first upper limit post limit the maximum sliding stroke between the first guide post and the first guide sleeve.

[0007] Furthermore, the second pressure die assembly includes a second lower pressure seat, on which a second lower pad is fixedly connected by a plurality of lower die feet. A clamping device is provided on the side of the second lower pad away from the second lower pressure seat. The clamping device includes two transverse pushing blocks slidably disposed on both sides along the length direction of the material plate unit and two longitudinal pushing blocks slidably disposed on both sides along the width direction of the material plate unit. The two transverse pushing blocks can approach or move away from each other along the width direction of the material plate unit, and each transverse pushing block is provided with a transverse insert block. The two longitudinal pushing blocks can approach or move away from each other along the length direction of the material plate unit, and each longitudinal pushing block is provided with a longitudinal block. In the assembled state, the transverse blocks on each transverse pushing block clamp the material plate unit in the width direction of the material plate unit, and the longitudinal blocks on each longitudinal pushing block clamp the material plate unit in the length direction of the material plate unit.

[0008] Furthermore, the second pressure mold assembly also includes a second upper pressure seat. A second upper pressure platform is provided on the central area of ​​one side of the second upper pressure seat corresponding to the clamping device. The second upper pressure platform has several transverse block embedding slots on both sides along the length of the material plate unit, corresponding to each transverse block on the two transverse pushing blocks. The second upper pressure platform also has several longitudinal block embedding slots on both sides along the width of the material plate unit, corresponding to each longitudinal block on the two longitudinal pushing blocks. Second guide sleeves are provided at the four corners of the side of the second upper pressure seat where the second upper pressure platform is located. The second lower pad has several guide sleeves at the four corners of the side of the second lower pressure plate where the clamping device is located, corresponding to the second... The guide sleeve is provided with a second guide post, and a second upper limit post is provided between the two second guide sleeves located on the same side of the second upper pressure seat. A plurality of second lower limit posts are provided on the second lower pad corresponding to each second upper limit post. Each second guide post is slidably engaged in each second guide sleeve. The second lower limit post and the second upper limit post limit the maximum sliding distance between the second guide post and the second guide sleeve. When the ends of the second lower limit post and the second upper limit post approach each other and abut, each of the transverse blocks is embedded in each of the transverse block embedding grooves, and each of the longitudinal blocks is embedded in each of the longitudinal block embedding grooves.

[0009] Furthermore, the upper surfaces of the two longitudinal pushing blocks on the opposite sides are inclined downwards in the direction of their separation. The two ends of the second upper pressure plate along the length of the material plate unit are also inclined, corresponding to the inclined surfaces on the longitudinal pushing blocks. A number of punch pins are provided on the second upper pressure plate in a preset area. The punch pins are telescopically positioned relative to the second upper pressure plate through a micro telescopic device located inside the second upper pressure plate. During the mold closing process, the inclined surfaces at both ends of the second upper pressure plate along the length of the material plate unit will contact the two ends of the material plate unit clamped in the clamping device along the length of the material plate unit before other areas. At this time, the micro telescopic device drives the punch pins to protrude from the surface of the second upper pressure plate near the material plate unit.

[0010] Furthermore, the third pressure die assembly includes a third lower pressure seat and a third upper pressure seat. A third lower pad is fixedly connected to the third lower pressure seat via several lower die feet. A first lower pressure die is fixed to the central region of the third lower pad on the side away from the third lower pressure seat. The upper surface of the first lower pressure die is a concave pressure-bearing surface. An upper pressure punch is provided in the central region of one side of the third upper pressure seat corresponding to the third lower pressure die. The lower surface of the upper pressure punch is a convex pressure-applying surface. The first lower pressure die is provided on the third lower pad. A third guide post is provided at each of the four corners on one side of the mold. A third guide sleeve is provided at each of the four corners on the side of the upper pressing die, corresponding to the third guide post. A third lower limit post is provided between each of the two third guide posts on the same side of the third lower pad. A number of third upper limit posts are provided on the third upper pressing seat, corresponding to each third lower limit post. Each of the third guide posts is slidably fitted in each of the third guide sleeves. The third lower limit post and the third upper limit post limit the maximum sliding stroke between the third guide post and the third guide sleeve.

[0011] Furthermore, the upper pressing punch has several punched pins in a preset area at its center. The first lower pressing die is composed of two side dies and an intermediate die. The intermediate die is located between the two side dies, and the two side dies are mirror images of the intermediate die. The upper surface of the intermediate die has punched grooves corresponding to the area on the upper pressing punch where the punched pins are located.

[0012] Furthermore, the fourth pressure die assembly includes a fourth lower pressure seat and a fourth upper pressure seat. A fourth lower pad is fixedly connected to the fourth lower pressure seat via several lower die feet. A second lower pressure die is fixed to the central area of ​​the side of the fourth lower pad away from the fourth lower pressure seat. An upper pressure post is provided in the central area of ​​the side of the fourth upper pressure seat corresponding to the second lower pressure die. A curved pressure post adapted to the second lower pressure die is fixed to the end of the upper pressure post away from the fourth upper pressure seat. Fourth guide posts are provided at the four corners of the side of the fourth lower pad where the second lower pressure die is located, and the side of the fourth upper pressure seat where the upper pressure post is located... At the four corners, a fourth guide sleeve is provided corresponding to the fourth guide post. A fourth lower limit post is provided between the two fourth guide posts on the same side of the fourth lower pad. A number of fourth upper limit posts are provided on the fourth upper pressure seat corresponding to each fourth lower limit post. Each of the fourth guide posts is slidably fitted in each fourth guide sleeve. The fourth lower limit post and the fourth upper limit post limit the maximum sliding stroke between the fourth guide post and the fourth guide sleeve. When the ends of the fourth lower limit post and the fourth upper limit post approach each other and abut, the curved pressure post on the upper pressure post is embedded and pressed into the groove of the second lower pressure die.

[0013] Furthermore, the forming method of the multi-step stamping die for the inner wiring harness protective cover of the automotive dashboard includes the following steps:

[0014] Step 1: The stamping plate is moved to the top of the first lower punch of the first die group by the stepping feeding device. At this time, the upper surface of the feeding table of the first die group and the upper surface of the first lower punch are coplanar.

[0015] Step 2: Drive the first upper pressure seat in the first pressure die group downward to close the mold. During the mold closing process, the first upper concave mold and the first lower convex mold on the first upper pressure table cooperate with each other to shape the stamped plate, thereby forming a material plate unit. After stamping, the first upper pressure seat moves upward, the feeding table is reset, and the spring pin in the first upper pressure table pushes the material plate unit out of the first upper concave mold. The pushed-out material plate unit is transferred to the second pressure die group through a series guiding and transfer device.

[0016] Step 3: After the material plate unit is transferred to the clamping device of the second pressure die group, the two transverse pushing blocks move closer to each other along the width direction of the material plate unit, and the two longitudinal pushing blocks move closer to each other along the length direction of the material plate unit; the transverse blocks on the transverse pushing blocks and the longitudinal blocks on the longitudinal pushing blocks cooperate to clamp and position the material plate unit, at which time the material plate unit is mounted on the clamping device;

[0017] Step 4: Drive the second upper pressure seat in the second pressure mold group to move down and close the mold. The inclined surfaces at both ends of the second upper pressure table along the length direction first contact the two ends of the material plate unit along the length direction, thereby completing the initial bending of the material plate unit.

[0018] Step 5: In Step 4, when the inclined surfaces at both ends of the second upper pressure table along the length direction contact the two ends of the material plate unit along the length direction, the micro telescopic device inside the second upper pressure table drives the punching pin to protrude from the side surface of the second upper pressure table near the material plate unit. As the second upper pressure table continues to descend, the punching pin completes punching of the preset areas at both ends of the material plate unit along the length direction.

[0019] Step Six: During Step Five, when the mold is closed, the transverse block is embedded in the transverse block embedding slot of the second upper pressure table, and the longitudinal block is embedded in the longitudinal block embedding slot of the second upper pressure table. After stamping is completed, the material plate unit is transferred to the third pressure die group via a series guiding and transferring device.

[0020] Step 7: After the material plate unit is transferred to the first lower die of the third die set, the third upper die set of the third die set moves down to close the die. The pressing surface of the upper punch and the receiving surface of the first lower die match to punch and bend the material plate unit, so that the two sides of the material plate unit are respectively attached to the pressing surface and the receiving surface, thereby completing the initial forming of the material plate unit.

[0021] Step 8: During the initial forming process, the punching pin at the center of the upper pressing punch simultaneously punches the preset area at the center of the material plate unit. After the initial forming is completed, the material plate unit is transferred to the fourth pressing die group via a series guiding and transferring device.

[0022] Step 9: After the material plate unit is transferred to the second lower die of the fourth die set, drive the locking fourth upper die to move down and close the die until the curved pressure column at the end of the upper pressure column is embedded in the groove of the second lower die and pressed tightly, thereby completing the final stamping of the material plate unit.

[0023] Beneficial Effects: The multi-step stamping die and forming method for the inner wiring harness protective cover of the automotive dashboard of the present invention, by setting up stamping dies in parallel series and matching them with a series-type guiding and transferring device, enables the material sheet to complete blanking, shaping, punching, bending, preliminary forming and complete forming operations sequentially and continuously, greatly improving the overall stamping efficiency while ensuring the continuity of process connections; by setting up bidirectional sliding transverse and longitudinal pushing blocks in the second pressing die, the material sheet is bidirectionally clamped and positioned in conjunction with the corresponding transverse and longitudinal blocks. When the inclined surface of the pressing table on the second pressing die first contacts the material sheet to complete the preliminary bending, the punching pin is simultaneously driven by a micro telescopic device to complete the punching, realizing The bending and punching processes are integrated, eliminating the need for repeated positioning and transfer, reducing processing time and avoiding cumulative errors, ensuring precise matching between hole positions and bends. The third pressure die group uses a curved-surface-adapted lower pressure die and upper pressure punch to achieve precise surface fitting during the initial bending of the material sheet, simultaneously completing punching in the corresponding areas, further improving process integration and forming accuracy. The fourth pressure die group uses a curved-surface pressure post and a lower pressure die to achieve final complete forming of the material sheet, ensuring the surface fit and structural regularity of the protective cover, meeting the assembly requirements of automotive interior components. Overall, this achieves efficient, precise, and stable stamping forming of wire harness protective covers, adapting to mass production needs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the first lower pressure seat;

[0025] Figure 2 This is a schematic diagram of the structure of the first upper pressure seat;

[0026] Figure 3 This is a schematic diagram of the second lower pressure seat;

[0027] Figure 4 This is a schematic diagram of the structure of the second upper pressure seat;

[0028] Figure 5 This is a side view of the second pressure mold assembly in the mold-closed state;

[0029] Figure 6 This is a schematic diagram of the third lower pressure seat;

[0030] Figure 7 This is a schematic diagram of the third upper pressure seat;

[0031] Figure 8 This is a schematic diagram of the fourth lower pressure seat;

[0032] Figure 9 This is a schematic diagram of the fourth upper pressure seat;

[0033] Figure 10 This is a side view showing the shape changes of a sheet metal unit after being stamped in different die sets. Detailed Implementation

[0034] The invention will now be further described with reference to the accompanying drawings.

[0035] As attached Figures 1-10 As shown, the multi-step stamping die for the inner wiring harness protective cover of the automotive dashboard includes a material plate unit 1 and a stamping die. The stamping die includes a first die group 2, a second die group 3, a third die group 4, and a fourth die group 5 arranged side by side. The material plate unit 1 passes through the first die group 2, the second die group 3, the third die group 4, and the fourth die group 5 in sequence via a series guiding and transfer device, and performs four continuous stamping operations in sequence: blanking and shaping, punching and bending, preliminary forming, and complete forming.

[0036] like Figures 1-2As shown, the first pressure die assembly 2 includes a first lower pressure seat 6 and a first upper pressure seat 7. A first lower pad 9 is fixedly connected to the first lower pressure seat 6 by a plurality of lower die feet 8. A first lower pressing platform 10 is fixed to the central area of ​​the side of the first lower pad 9 away from the first lower pressure seat 6. A first lower punch 11 is fixed to the central area of ​​the side of the first lower pressing platform 10 away from the first lower pad 9. A feeding platform 12 is slidably disposed on one side of the first lower pressing platform 10 along the length direction of the first lower punch 11. In the initial state, the upper surface of the feeding platform 12 is coplanar with the upper surface of the first lower punch 11. The first upper pressure plate 13 is provided in the central area of ​​one side of the first upper pressure plate 7, corresponding to the first lower pressure plate 10. The first upper pressure plate 14 is provided in the central area of ​​the side of the first upper pressure plate 13 away from the first upper pressure plate 7, corresponding to the first lower punch 11. A plurality of spring ejector pins 15 are provided in the first upper pressure plate 13. Each spring ejector pin 15 is located in the area of ​​the first upper die 14. The spring ejector pins 15 can eject the material plate unit 1 formed by the first pressure die group 2 from the first upper die 14 after stamping, so as to avoid the material plate unit 1 being stuck in the first upper die 14. More specifically, the feeding table 12 is slidably connected to one side of the first lower pressure table 10 via a vertically arranged slide rail, and the slide rail is provided with a reset structure. The reset structure always exerts a force on the feeding table 12 to make it slide vertically away from the first lower pad 9. The feeding table 12 is provided with a stepping feeding device away from the first lower pressure table 10. The stepping feeding device can move the stamped plate along the feeding table 12 to directly above the first lower punch 11. When the first upper pressure seat 7 approaches the first lower pressure seat 6 in the vertical direction for die closing and stamping, the feeding table 12 moves along the slide rail towards the first upper pressure table 13 under the action of the first upper pressure table 13. The feeding table 12 slides vertically towards the first lower pad 9 until the upper surface of the feeding table 12 is coplanar with the upper surface of the first lower press table 10. When the first upper press table 7 opens the mold in a vertical direction away from the first lower press table 6, the feeding table 12 slides vertically along the slide rail away from the first lower pad 9 under the action of the reset structure until the upper surface of the feeding table 12 is coplanar with the upper surface of the first lower punch 11. At this time, the stepping feeding device can move the stamped plate along the feeding table 12 to directly above the first lower punch 11 according to the preset stepping distance. The stamped plate forms the material plate unit 1 after being stamped by the first press die group 2.

[0037] A first guide post 16 is provided on the first lower pad 9, a first guide sleeve 17 is provided on the first upper pressure seat 7 corresponding to the first guide post 16, a first lower limit post 18 is provided on the first lower pad 9, a first upper limit post 19 is provided on the first upper pressure seat 7 corresponding to the first lower limit post 18, guide rods 20 are provided at the four corners of the side where the first lower punch 11 is located on the first lower pressure table 10, and guide grooves 21 are provided at the four corners of the side where the first upper die 14 is located on the first upper pressure table 13 corresponding to the guide rods 20. In the assembled state, each of the first guide posts 16 is coaxially slidably engaged in each of the first guide sleeves 17, and each of the guide rods 20 is coaxially engaged in each of the guide grooves 21. The first lower limit post 18 and the first upper limit post 19 limit the maximum sliding distance between the first guide post 16 and the first guide sleeve 17. It should be noted here that, in reference Figure 1 and Figure 2 When deriving the assembly state between the first lower pressure seat 6 and the first upper pressure seat 7 in the first pressure module 2 Figure 2 The image shown needs to be flipped 180°, therefore the first guide post 16 and the first guide sleeve 17 that cooperate with each other are in Figure 1 and Figure 2 The left and right directions are reversed, not because the images are mismatched.

[0038] like Figures 3-5As shown, the second pressure die assembly 3 includes a second lower pressure seat 22. A second lower pad 24 is fixedly connected to the second lower pressure seat 22 by a plurality of lower die feet 8. A clamping device is provided at the center of the second lower pad 24 on the side away from the second lower pressure seat 22. The clamping device includes two transverse pushing blocks 25 slidably arranged on both sides along the length direction of the material plate unit 1 and two longitudinal pushing blocks 26 slidably arranged on both sides along the width direction of the material plate unit 1. The two transverse pushing blocks 25 can move closer or further away from each other along the width direction of the material plate unit 1, and each transverse pushing block 25 is provided with a transverse block 27. The two longitudinal pushing blocks 26 can move closer or further away from each other along the length direction of the material plate unit 1, and each longitudinal pushing block 26 is provided with a longitudinal block 28. In the assembled state, the transverse blocks 27 on each transverse pushing block 25 clamp the material plate unit 1 in the width direction of the material plate unit 1, and the longitudinal blocks 28 on each longitudinal pushing block 26 clamp the material plate unit 1 in the length direction of the material plate unit 1. More specifically, since the material plate unit 1 is clamped between each transverse pushing block 25 and each longitudinal pushing block 26 in the assembled state, the side of the material plate unit 1 near the second lower pad 24 is hollow rather than solid. Furthermore, the length of the material plate unit 1 after being shaped by the first pressing die group 2 is much greater than its width. Therefore, during the punching process of the second pressing die group 3, the two ends of the material plate unit 1 along the length direction will deform before the two sides along the width direction under the action of pressure. Therefore, when designing each of the longitudinal pushing blocks 26, it should be ensured that the two longitudinal blocks 28 are located on the side of the two longitudinal pushing blocks 26 that are far apart from each other, and the upper surface of the side of the longitudinal pushing blocks 26 that is close to each other is a plane. In this way, in the assembled state, the two ends of the material plate unit 1 along the length direction can be respectively mounted on the plane of the upper surface of the side of the two longitudinal pushing blocks 26 that is close to each other, thereby providing more planar clamping force and avoiding deformation of the material plate unit 1 due to insufficient horizontal clamping force when punching in the second pressing die group 3.

[0039] The second pressure mold assembly 3 also includes a second upper pressure seat 23. A second upper pressure platform 29 is provided on the central area of ​​one side of the second upper pressure seat 23 corresponding to the clamping device. Several transverse block embedding slots 30 are provided on both sides of the second upper pressure platform 29 along the length direction of the material plate unit 1, corresponding to the transverse blocks 27 on the two transverse pushing blocks 25. Several longitudinal block embedding slots 31 are provided on both sides of the second upper pressure platform 29 along the width direction of the material plate unit 1, corresponding to the longitudinal blocks 28 on the two longitudinal pushing blocks 26. Second guide sleeves 34 are provided at the four corners of the side of the second upper pressure seat 23 where the second upper pressure platform 29 is located. Second guide sleeves 34 are provided at the four corners of the side of the second lower pad 24 where the clamping device is located, corresponding to the second guide sleeves 34. There is a second guide post 33, and a second upper limit post 36 is provided between the two second guide sleeves 34 on the same side of the second upper pressure seat 23. A number of second lower limit posts 35 are provided on the second lower pad 24 corresponding to each second upper limit post 36. Each second guide post 33 is slidably engaged in each second guide sleeve 34. The second lower limit post 35 and the second upper limit post 36 limit the maximum sliding distance between the second guide post 33 and the second guide sleeve 34. During the mold closing process, when the second lower limit post 35 and the second upper limit post 36 abut against each other, each of the transverse blocks 27 is embedded in each transverse block embedding groove 30, and each of the longitudinal blocks 28 is embedded in each longitudinal block embedding groove 31.

[0040] The upper surfaces of the two longitudinal pushing blocks 26 on the opposite sides are inclined downwards in the direction of their separation. The two ends of the second upper pressure plate 29 along the length of the material plate unit 1 are also inclined, corresponding to the inclined surfaces on the longitudinal pushing blocks 26. Furthermore, the inclined surfaces at both ends of the second upper pressure plate 29 along the length are inclined upwards in the direction away from the center area of ​​the second upper pressure plate 29. Since the material plate unit 1 after being stamped by the first die assembly 2 is still a flat material plate, during the mold closing process of the second die assembly 3, the inclined surfaces at both ends of the second upper pressure plate 29 along the length will contact the two ends of the material plate unit 1 clamped in the clamping device along the length before other areas, and will initially bend the material plate unit 1. A plurality of punched pins 32 are provided on the second upper pressure plate 29 in a preset area. The punched pins 32 are located inside the second upper pressure plate 29 via micro-holes... The telescopic device 37 is telescopically arranged relative to the second upper pressure table 29. In the initial state, each of the punching pins 32 is completely located inside the second upper pressure table 29, that is, the end of each punching pin 32 is not coplanar with the bottom stamping surface of the second upper pressure table 29, and is located in the second upper pressure table 29. When the inclined surfaces at both ends of the second upper pressure table 29 along the length direction come into contact with the two ends of the material plate unit 1 clamped in the clamping device along the length direction, there is still a certain distance between the other areas of the second upper pressure table 29 and the material plate unit 1 clamped in the clamping device. At this time, the micro telescopic device 37 drives the punching pins 32 to protrude from the surface of the second upper pressure table 29 on the side close to the material plate unit 1, so that the material plate unit 1 is punched during the subsequent process of the second upper pressure table 29 approaching the second lower pressure seat 22. Thus, the material plate unit 1 completes the two processing processes of bending and punching in one stamping process.

[0041] Furthermore, since the material plate unit 1 is only mounted on a rectangular frame formed by splicing together each transverse pushing block 25 and each longitudinal pushing block 26 when it is engaged with the second pressing die 3, the side of the material plate unit 1 near the second lower pad 24 is hollow rather than solid. Here, hollow does not mean that the material plate unit 1 is hollow, but that there is a cavity between the material plate unit 1 and the second lower pad 24. Compared with the prior art, which specifically sets the punching hole for the opening pin 32, the present invention can achieve the rapid positioning of the second upper pressing table 29 through the limiting cooperation between the transverse block 27 and the transverse block embedding groove 30, and the limiting cooperation between the longitudinal block 28 and the longitudinal block embedding groove 31. It does not require the opening pin 32 to be aligned with its corresponding punching hole as in the prior art. Therefore, compared with the prior art, the present invention can significantly improve the punching efficiency while ensuring the punching accuracy.

[0042] like Figures 6-7As shown, the third pressure die assembly 4 includes a third lower pressure seat 38 and a third upper pressure seat 39. A third lower pad 40 is fixedly connected to the third lower pressure seat 38 by a plurality of lower die feet 8. A first lower pressure die 41 is fixed in the central area of ​​the side of the third lower pad 40 away from the third lower pressure seat 38. The upper surface of the first lower pressure die 41 is a concave pressure-bearing curved surface 42. An upper pressure punch 43 is provided in the central area of ​​one side of the third upper pressure seat 39 corresponding to the first lower pressure die 41. The lower surface of the upper pressure punch 43 is a convex pressure-applying curved surface 44. Third guide posts 45 are provided at the four corners of the side of the third lower pad 40 where the first lower pressure die 41 is located. Third guide posts 45 are provided at the four corners of the side of the third upper pressure seat 39 where the upper pressure punch 43 is located, corresponding to the third guide posts 45. The guide sleeve 46, the third lower pad 40, the third lower guide plate 40, the third lower limit post 47 is provided between the two third guide posts 45 on the same side, the third upper pressure seat 39 is provided with a number of third upper limit posts 48 corresponding to each third lower limit post 47, each third guide post 45 is slidably fitted in each third guide sleeve 46; the third lower limit post 47 and the third upper limit post 48 limit the maximum sliding stroke between the third guide post 45 and the third guide sleeve 46; during the mold closing process, when the ends of the third lower limit post 47 and the third upper limit post 48 approach each other and abut, the upper pressure punch 43 bends the material plate unit 1 placed on the first lower pressure die 41, one side of the material plate unit 1 is bent to fit with the pressure surface 44, and the other side is bent to fit with the pressure surface 42.

[0043] The upper pressing punch 43 has several punch pins 32 set in a preset area at its center. The first lower pressing die 41 is composed of two side dies 49 and an intermediate die 50. The intermediate die 50 is located between the two side dies 49, and the two side dies 49 are mirror images of the intermediate die 50. The upper surface of the intermediate die 50 is provided with punching grooves corresponding to the area on the upper pressing punch 43 where the punch pins 32 are set. That is, when the material plate unit 1 is stamped in the third pressing die group 4, the central area of ​​the material plate unit 1 near the third lower pressing seat 38 is hollow instead of solid. Its design principle is the same as that of the second pressing die group 29, and will not be described in detail here.

[0044] It is important to emphasize that the preset area for the punching pins 32 on the second upper pressure platform 29 and the preset area for the punching pins 32 on the third upper pressure platform are not the same area on the material plate unit 1. More specifically, the preset area for the punching pins 32 on the second upper pressure platform 29 is close to both ends of the material plate unit 1 along its length. Since the material plate unit 1 is clamped by the clamping device in the second pressure die 3, the side of the material plate unit 1 near the second lower pad 24 is hollow rather than solid. The two ends of the material plate unit 1 along its length are respectively mounted on the two longitudinal pushing blocks 26. Therefore, during the stamping process of the material plate unit 1 by the second pressure die 3, the two ends of the material plate unit 1 along its length can withstand greater force without deformation. If the area for the punching pins 32 on the second upper pressure platform 29 corresponds to the center area of ​​the material plate unit 1, the material plate unit 1 may shift or fail to bend during the stamping process due to the hollow center area of ​​the clamping device. In the third pressure die 4, the material plate unit 1...

[0045] However, unlike the second die group 3, in the third die group 4, the punch pin 32 at the center of the upper punch 43 is directly fixed to the upper punch 43. Since the punching action of the third die group 4 is to perform a large bending of the material plate unit 1, the punch pin 32 does not cause any adverse effects at the point where it contacts the material plate unit 1 before the upper punch 43. Furthermore, compared to the second die group 3, the third die group 4 only has punching grooves on the intermediate die 50 of the first lower die 41 corresponding to the area where the punch pin 32 is located. The area of ​​the punching grooves is very small relative to the area of ​​the entire material plate unit 1. In other words, the material plate unit 1 and the first lower die 41 and The clamping area between the upper pressing punches 43 is much larger than the non-clamping punching area, so the problem of the material plate unit 1 shifting due to punching in the second pressing die group 3 will not occur. Moreover, although it is not described in the specification of this invention, it is not difficult for those skilled in the art to see from the accompanying drawings of this specification that each pressing die group in this invention is provided with a corresponding limiting block. Therefore, it is not necessary to ensure that the punching pin 32 in the third pressing die group 4 extends into the upper pressing punch 43 in the initial state. And when the two sides of the material plate unit 1 are respectively in contact with the pressure-applying curved surface 44 and the pressure-receiving curved surface 42, the punching pin 32 on the upper pressing punch 43 just completes the punching of the material plate unit 1.

[0046] like Figures 8-9As shown, the fourth pressure die assembly 5 includes a fourth lower pressure seat 51 and a fourth upper pressure seat 52. A fourth lower pad 53 is fixedly connected to the fourth lower pressure seat 51 by a plurality of lower die feet 8. A second lower pressure die 54 is fixed to the central area of ​​the side of the fourth lower pad 53 away from the fourth lower pressure seat 51. An upper pressure post 55 is provided in the central area of ​​the side of the fourth upper pressure seat 52 corresponding to the fourth lower pressure die 54. A curved pressure post 60 adapted to the second lower pressure die 54 is fixed to one end of the upper pressure post 52. Fourth guide posts 56 are provided at the four corners of the side of the fourth lower pad 53 where the second lower pressure die 54 is provided. Fourth guide posts 56 are provided at the four corners of the side of the fourth upper pressure seat 52 where the upper pressure post 55 is provided. The fourth guide sleeve 57 is provided. A fourth lower limit post 58 is provided between two fourth guide posts 56 located on the same side of the fourth lower pad 53. A number of fourth upper limit posts 59 are provided on the fourth upper pressure seat 52 corresponding to each fourth lower limit post 58. Each fourth guide post 56 is slidably fitted in each fourth guide sleeve 57. The fourth lower limit post 58 and the fourth upper limit post 59 limit the maximum sliding stroke between the fourth guide post 56 and the fourth guide sleeve 59. During the mold closing process, when the ends of the fourth lower limit post 58 and the fourth upper limit post 59 approach each other and abut, the curved pressure post 60 on the upper pressure post 55 is embedded and pressed into the groove of the second lower pressure die 54, thereby completing the final stamping forming of the material plate unit 1.

[0047] The forming method of the multi-step stamping die for the inner wiring harness protective cover of the automotive dashboard according to the present invention includes the following steps:

[0048] Step 1: The stamping plate is moved to the top of the first lower punch 11 of the first die group 2 by the stepping feeding device. At this time, the upper surface of the feeding table 12 of the first die group 2 is coplanar with the upper surface of the first lower punch 11.

[0049] Step 2: Drive the first upper pressure seat 7 in the first pressure die group 2 downward to close the mold. During the mold closing process, the first upper die 14 and the first lower punch 11 on the first upper pressure table 13 cooperate with each other to shape the stamped plate, thereby forming the material plate unit 1. After stamping, the first upper pressure seat 7 moves upward, the feeding table 12 is reset, and the spring pin 15 in the first upper pressure table 13 pushes the material plate unit 1 out from the first upper die 14. The ejected material plate unit 1 is transferred to the second pressure die group 3 through the series guide and transfer device.

[0050] Step 3: After the material plate unit 1 is transferred to the clamping device of the second pressing mold group 3, the two transverse pushing blocks 25 move closer to each other along the width direction of the material plate unit 1, and the two longitudinal pushing blocks 26 move closer to each other along the length direction of the material plate unit 1; the transverse blocks 27 on the transverse pushing blocks 25 and the longitudinal blocks 28 on the longitudinal pushing blocks 26 cooperate to clamp and position the material plate unit 1, at which time the material plate unit 1 is mounted on the clamping device;

[0051] Step 4: Drive the second upper pressure seat 23 in the second pressure mold group 3 to move down and close the mold. The inclined surfaces at both ends of the second upper pressure table 29 along the length direction first contact the two ends of the material plate unit 1 along the length direction, thereby completing the initial bending of the material plate unit 1.

[0052] Step 5: In step 4, when the inclined surfaces at both ends of the second upper pressure table 29 along the length direction contact the two ends of the material plate unit 1 along the length direction, the miniature telescopic device 37 inside the second upper pressure table 29 drives the punching pin 32 to protrude from the side surface of the second upper pressure table 29 near the material plate unit 1. As the second upper pressure table 29 continues to descend, the punching pin 32 punches holes in the preset areas at both ends of the material plate unit 1 along the length direction.

[0053] Step Six: During the process of Step Five, when the mold is closed, the transverse block 27 is embedded in the transverse block embedding groove 30 of the second upper pressure table 29, and the longitudinal block 28 is embedded in the longitudinal block embedding groove 31 of the second upper pressure table 29. After the stamping is completed, the material plate unit 1 is transferred to the third pressure die group 4 via a series guiding and transferring device.

[0054] Step 7: After the material plate unit 1 is transferred to the first lower pressing die 41 of the third pressing die group 4, the third upper pressing seat 39 of the third pressing die group 4 moves down to close the die. The pressing surface 44 of the upper pressing punch 43 cooperates with the pressing surface 42 of the first lower pressing die 41 to punch and bend the material plate unit 1, so that the two sides of the material plate unit 1 are respectively attached to the pressing surface 44 and the pressing surface 42, thereby completing the initial forming of the material plate unit 1.

[0055] Step 8: During the initial forming process, the punch pin 32 at the center of the upper pressing punch 43 simultaneously punches the preset area at the center of the material plate unit 1. After the initial forming is completed, the material plate unit 1 is transferred to the fourth pressing die group 5 via a series guiding and transferring device.

[0056] Step 9: After the material plate unit 1 is transferred onto the second lower die 54 of the fourth die set 5, the fourth upper die 52 is driven to descend and close the die until the curved die 60 at the end of the upper die 55 is embedded into the groove of the second lower die 54 and pressed tightly, thereby completing the final stamping of the material plate unit 1.

[0057] The above are the preferred embodiments described in this invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention.

Claims

1. A multi-step stamping die for a protective cover plate for the inner side of a car dashboard wiring harness, characterized in that: The material plate unit (1) includes a stamping die and a stamping die. The stamping die includes a first die group (2), a second die group (3), a third die group (4) and a fourth die group (5) arranged side by side. The material plate unit 1 is stamped by the stamped plate part through the first die group (2). A series guide transfer device is provided between each die group. The material plate unit (1) passes through the first die group (2), the second die group (3), the third die group (4) and the fourth die group (5) in sequence through the series guide transfer device, and performs four continuous stamping operations in sequence: blanking and shaping, punching and bending, preliminary forming and complete forming.

2. The multi-step stamping die for the inner wiring harness protective cover of the automotive dashboard according to claim 1, characterized in that: The first pressure die assembly (2) includes a first lower pressure seat (6) and a first upper pressure seat (7). A first lower pad (9) is fixedly connected to the first lower pressure seat (6) by a plurality of lower die feet (8). A first lower pressing platform (10) is fixed in the central area of ​​the first lower pad (9) away from the first lower pressure seat (6). A first lower punch (11) is fixed in the central area of ​​the first lower pressing platform (10) away from the first lower pad (9). A feeding platform (12) is slidably arranged on one side of the first lower pressing platform (10) along the length direction of the first lower punch (11). In the initial state, the upper surface of the feeding table (12) is coplanar with the upper surface of the first lower punch (11); the central area of ​​one side of the first upper pressure seat (7) is provided with a first upper pressure table (13) corresponding to the first lower pressure table (10), and the central area of ​​the side of the first upper pressure table (13) away from the first upper pressure seat (7) is provided with a first upper die (14) corresponding to the first lower punch (11). A plurality of spring ejector pins (15) are provided in the first upper pressure table (13), and each spring ejector pin (15) is located in the area where the first upper die (14) is located.

3. The multi-step stamping die for the inner wiring harness protective cover of the automotive dashboard according to claim 2, characterized in that: A first guide post (16) is provided on the first lower pad (9), a first guide sleeve (17) is provided on the first upper pressure seat (7) corresponding to the first guide post (16), a first lower limit post (18) is provided on the first lower pad (9), a first upper limit post (19) is provided on the first upper pressure seat (7) corresponding to the first lower limit post (18), a guide rod (20) is provided at the four corners of the side where the first lower punch (11) is provided on the first lower pressure table (10), and a guide groove (21) is provided at the four corners of the side where the first upper die (14) is provided on the first upper pressure table (13) corresponding to the guide rod (20). In the assembled state, each of the first guide posts (16) is slidably engaged in each of the first guide sleeves (17) on the same axis, and each of the guide rods (20) is slidably engaged in the guide groove (21) on the same axis. The first lower limit post (18) and the first upper limit post (19) limit the maximum sliding stroke between the first guide post (16) and the first guide sleeve (17).

4. The multi-step stamping die for the inner wiring harness protective cover of the automotive dashboard according to claim 1, characterized in that: The second pressure die assembly (3) includes a second lower pressure seat (22). A second lower pad (24) is fixedly connected to the second lower pressure seat (22) by a plurality of lower die feet (8). A clamping device is provided on the side of the second lower pad (24) away from the second lower pressure seat (22). The clamping device includes two transverse pushing blocks (25) slidably arranged on both sides along the length direction of the material plate unit (1) and two longitudinal pushing blocks (26) slidably arranged on both sides along the width direction of the material plate unit (1). The two transverse pushing blocks (25) can move along the width direction of the material plate unit (1). The two longitudinal push blocks (26) are able to move closer or further apart from each other along the length direction of the material plate unit (1), and each longitudinal push block (26) is provided with a longitudinal block (28). In the assembled state, the transverse blocks (27) on each transverse push block (25) clamp the material plate unit (1) in the width direction of the material plate unit (1), and the longitudinal blocks (28) on each longitudinal push block (26) clamp the material plate unit (1) in the length direction of the material plate unit (1).

5. The multi-step stamping die for the inner wiring harness protective cover of the automotive dashboard according to claim 4, characterized in that: The second pressure mold assembly (3) also includes a second upper pressure seat (23). A second upper pressure platform (29) is provided in the central area of ​​one side of the second upper pressure seat (23) corresponding to the clamping device. The second upper pressure platform (29) has several transverse block embedding slots (30) on both sides of the material plate unit (1) along the length direction, corresponding to each transverse block (27) on the two transverse push blocks (25). The second upper pressure platform (29) has several longitudinal block embedding slots (31) on both sides of the material plate unit (1) along the width direction, corresponding to each longitudinal block (28) on the two longitudinal push blocks (26). A second guide sleeve (34) is provided at the four corners of the side of the second upper pressure seat (23) where the second upper pressure platform (29) is located. The second lower pad (24) has a second guide sleeve (34) at the four corners of the side of the clamping device located. There is a second guide post (33), and a second upper limit post (36) is provided between the two second guide sleeves (34) on the same side of the second upper pressure seat (23). A number of second lower limit posts (35) are provided on the second lower pad (24) corresponding to each second upper limit post (36). Each second guide post (33) is slidably engaged in each second guide sleeve (34). The second lower limit post (35) and the second upper limit post (36) limit the maximum sliding distance between the second guide post (33) and the second guide sleeve (34). When the ends of the second lower limit post (35) and the second upper limit post (36) approach each other and abut, each of the transverse blocks (27) is embedded in each transverse block embedding groove (30), and each of the longitudinal blocks (28) is embedded in each longitudinal block embedding groove (31).

6. The multi-step stamping die for the inner wiring harness protective cover of the automotive dashboard according to claim 5, characterized in that: The upper surfaces of the two longitudinal pushing blocks (26) on the side away from each other are inclined downwards in the direction of mutual separation. The two ends of the second upper pressure table (29) along the length direction of the material plate unit (1) are also inclined to the same angle corresponding to the inclined surface on the longitudinal pushing block (26). A number of punch pins (32) are provided on the second upper pressure table (29) in a preset area. The punch pins (32) are telescopically arranged relative to the second upper pressure table (29) by a micro telescopic device (37) provided inside the second upper pressure table (29). During the mold closing process, the inclined surfaces at both ends of the second upper pressure table (29) along the length direction will contact the two ends of the material plate unit (1) clamped in the clamping device along the length direction before other areas. At this time, the micro telescopic device (37) drives the punch pins (32) to protrude from the surface of the second upper pressure table (29) on the side close to the material plate unit (1).

7. The multi-step stamping die for the inner wiring harness protective cover of the automotive dashboard according to claim 1, characterized in that: The third pressure die assembly (4) includes a third lower pressure seat (38) and a third upper pressure seat (39). A third lower pad (40) is fixedly connected to the third lower pressure seat (38) by a plurality of lower die feet (8). A first lower pressure die (41) is fixed in the central area of ​​the third lower pad (40) away from the third lower pressure seat (38). The upper surface of the first lower pressure die (41) is a concave pressure-bearing curved surface (42). An upper pressure punch (43) is provided in the central area of ​​one side of the third upper pressure seat (39) corresponding to the third lower pressure die (41). The lower surface of the upper pressure punch (43) is a convex pressure-applying curved surface (44). The first lower pressure die (41) is provided on the third lower pad (40). A third guide post (45) is provided at one of the four corners of the third upper pressure seat (39). A third guide sleeve (46) is provided at one of the four corners of the third upper pressure seat (39) corresponding to the third guide post (45). A third lower limit post (47) is provided between the two third guide posts (45) on the same side of the third lower pad (40). A number of third upper limit posts (48) are provided on the third upper pressure seat (39) corresponding to each third lower limit post (47). Each third guide post (45) is slidably fitted in each third guide sleeve (46). The third lower limit post (47) and the third upper limit post (48) limit the maximum sliding stroke between the third guide post (45) and the third guide sleeve (46).

8. The multi-step stamping die for the inner wiring harness protective cover of the automotive dashboard according to claim 7, characterized in that: The upper pressing punch (43) has a number of punch pins (32) in a preset area at its center. The first lower pressing die (41) is composed of two side dies (49) and an intermediate die (50). The intermediate die (50) is located between the two side dies (49) and the two side dies (49) are mirror images of the intermediate die (50). The upper surface of the intermediate die (50) has punch grooves corresponding to the area on the upper pressing punch (43) where the punch pins (32) are provided.

9. The multi-step stamping die for the inner wiring harness protective cover of the automotive dashboard according to claim 1, characterized in that: The fourth pressure die assembly (5) includes a fourth lower pressure seat (51) and a fourth upper pressure seat (52). A fourth lower pad (53) is fixedly connected to the fourth lower pressure seat (51) by a number of lower die feet (8). A second lower pressure die (54) is fixed in the central area of ​​the side of the fourth lower pad (53) away from the fourth lower pressure seat (51). An upper pressure post (55) is provided in the central area of ​​the side of the fourth upper pressure seat (52) corresponding to the second lower pressure die (54). A curved pressure post (60) adapted to the second lower pressure die (54) is fixed at the end of the upper pressure post away from the fourth upper pressure seat (52). A fourth guide post (56) is provided at the four corners of the side of the fourth lower pad (53) where the second lower pressure die (54) is provided. A fourth guide post (56) is provided at the four corners of the side of the fourth upper pressure seat (52) where the upper guide post (55) is provided. A fourth guide sleeve (57) is provided at the corner corresponding to the fourth guide post (56). A fourth lower limit post (58) is provided between the two fourth guide posts (56) on the same side of the fourth lower pad (53). A number of fourth upper limit posts (59) are provided on the fourth upper pressure seat (52) corresponding to each fourth lower limit post (58). Each fourth guide post (56) is slidably fitted in each fourth guide sleeve (57). The fourth lower limit post (58) and the fourth upper limit post (59) limit the maximum sliding distance between the fourth guide post (56) and the fourth guide sleeve (57). When the ends of the fourth lower limit post (58) and the fourth upper limit post (59) approach each other and abut, the curved pressure post (60) on the upper pressure post (55) is embedded and pressed into the groove of the second lower pressure die (54).

10. The forming method of the multi-step stamping die for the inner wiring harness protective cover of an automotive dashboard according to any one of claims 1 to 9, characterized in that: Includes the following steps: Step 1: The stamping plate is moved to the top of the first lower punch (11) of the first die group (2) by the stepping feeding device. At this time, the upper surface of the feeding table (12) of the first die group (2) is coplanar with the upper surface of the first lower punch (11). Step 2: Drive the first upper pressure seat (7) in the first pressure die group (2) downward to close the mold. During the mold closing process, the first upper die (14) on the first upper pressure table (13) and the first lower punch (11) cooperate with each other to shape the stamped plate, thereby forming the material plate unit (1). After stamping, the first upper pressure seat (7) moves upward, the feeding table (12) is reset, and the spring pin (15) in the first upper pressure table (13) pushes the material plate unit (1) out from the first upper die (14). The ejected material plate unit (1) is transferred to the second pressure die group (3) through the series guide transfer device. Step 3: When the material plate unit (1) is transferred to the clamping device of the second pressure die group (3), the two transverse pushing blocks (25) move closer to each other along the width direction of the material plate unit (1), and the two longitudinal pushing blocks (26) move closer to each other along the length direction of the material plate unit (1); the transverse blocks (27) on the transverse pushing blocks (25) and the longitudinal blocks (28) on the longitudinal pushing blocks (26) cooperate to clamp and position the material plate unit (1), at which time the material plate unit (1) is mounted on the clamping device; Step 4: Drive the second upper pressure seat (23) in the second pressure mold group (3) to move down to close the mold. The inclined surfaces at both ends of the second upper pressure table (29) along the length direction first contact the two ends of the material plate unit (1) along the length direction, thereby completing the initial bending of the material plate unit (1). Step 5: In step 4, when the inclined surfaces at both ends of the second upper pressure table (29) along the length direction contact the two ends of the material plate unit (1) along the length direction, the micro telescopic device (37) inside the second upper pressure table (29) drives the punching pin (32) to protrude from the side surface of the second upper pressure table (29) near the material plate unit (1). As the second upper pressure table (29) continues to descend, the punching pin (32) punches holes in the preset areas at both ends of the length direction of the material plate unit (1). Step 6: During the process of step 5, when the mold is closed, the transverse block (27) is embedded in the transverse block embedding slot (30) of the second upper pressure table (29), and the longitudinal block (28) is embedded in the longitudinal block embedding slot (31) of the second upper pressure table (29). After the stamping is completed, the material plate unit (1) is transferred to the third pressure die group (4) via a series guiding and transfer device. Step 7: After the material plate unit (1) is transferred to the first lower die (41) of the third die set (4), the third upper die (39) of the third die set (4) moves down to close the die. The pressure surface (44) of the upper die (43) and the pressure surface (42) of the first lower die (41) cooperate to punch and bend the material plate unit (1), so that the two sides of the material plate unit (1) are respectively attached to the pressure surface (44) and the pressure surface (42), thereby completing the initial forming of the material plate unit 1. Step 8: During the initial forming process, the punching pin (32) at the center of the upper pressing punch (43) simultaneously punches the preset area at the center of the material plate unit (1). After the initial forming is completed, the material plate unit (1) is transferred to the fourth pressing die group (5) via a series guiding and transferring device. Step 9: After the material plate unit (1) is transferred onto the second lower die (54) of the fourth die set (5), drive the locking fourth upper die (52) to descend and close the die until the curved pressure column (60) at the end of the upper pressure column (55) is embedded in the groove of the second lower die (54) and pressed tightly, thereby completing the final stamping of the material plate unit (1).

Images