A process for forming a secondary instrument panel cup holder support

Abstract

The application discloses a kind of vice instrument board cup holder support forming process, comprising the following steps: S100, blanking punch positioning hole;S200, with the positioning hole of steel plate is stepped after being punched and cut edge;S300, after the steel plate of punching and cutting edge is stepped after flanging treatment;S400, after the steel plate of flanging is stepped after punching small hole;S500, after the steel plate of punching small hole is stepped after separating cutting;Step S100 and / or step S200 and / or step S300 and / or step 100 to step 400 are provided with the positive pre-punching operation of pre-punching steel plate downward and the reverse pre-punching operation of pre-punching steel plate upward, once positive pre-punching operation and once reverse pre-punching operation are a group of pre-punching steps, pre-punching step is provided with several groups, a group of pre-punching steps are set in the same step. The above-mentioned vice instrument board cup holder support forming process is reasonable in design, pre-punching is carried out on the final hole forming position of steel plate, the metal fatigue of hole forming position is caused, and the positive punch and reverse punch of steel plate can be completed by once clamping of upper die holder and lower die holder.

Description

Technical Field

[0001] This invention relates to the field of stamping technology, and in particular to a forming process for a sub-instrument panel cup holder bracket. Background Technology

[0002] Due to space constraints in the sub-dashboard area and based on actual user usage, the cup holder bracket in the sub-dashboard does not require excessively thick steel plate material. As a result, the connection hole between the cup holder bracket and the sub-dashboard is close to the thickness of the steel plate. Therefore, the connection hole punched in the steel plate is called a small hole. A small hole refers to a punching hole diameter that is smaller than or close to the material thickness. When punching a small hole, the punch is very easy to break.

[0003] When punching a 3.0mm thick hot-rolled steel plate, the punching diameter is 3.6mm. The punching force is calculated using the formula P = k * L * t * σb (where: P_punching - punching force, in kN; k - safety factor, taken as 1.0; L - hole circumference, 11.3mm; t - plate thickness, 3.0mm; σb - material strength limit, calculated based on the measured value of 295MPa).

[0004] The punching force for a single hole can be calculated as: P = 1.0 * 11.3 * 3.0 * 295 = 10.0 kN;

[0005] Because the material thickness is 3.0mm, the punch diameter is 3.6mm, the hole diameter-to-material-thickness ratio is 1.2, the punch structure is weak, and the punch is prone to breakage during actual production.

[0006] Therefore, it is necessary to improve the molding process of the sub-dashboard cup holder bracket in the existing technology. Summary of the Invention

[0007] The purpose of this invention is to overcome the defects in the existing technology and provide a forming process for a sub-instrument cup holder bracket. The process involves pre-impacting the steel plate at the final hole-forming point to cause elastic or plastic deformation. The upper and lower die seats can complete the forward and reverse punching of the steel plate in one mold closing, which accelerates the deformation at the hole-forming point of the steel plate and increases the number of deformations, causing metal fatigue in the steel plate at the final hole-forming point and reducing the punching force at the final punching point.

[0008] To achieve the above technical effects, the technical solution of the present invention is: a molding process for a sub-dashboard cup holder bracket, comprising the following steps:

[0009] S100, blanking punch positioning hole;

[0010] S200: After the steel plate with positioning holes is progressively fed, it is punched and trimmed.

[0011] S300, After the steel plate is punched and trimmed, it is then subjected to flanging treatment;

[0012] S400: After the steel plate is flanged, small holes are punched in it.

[0013] S500: After the steel plate with small holes is punched, it is separated and cut off in a progressive manner.

[0014] Between steps S100 and / or steps S200 and / or steps S300 and / or steps 100 to 400, there are positive pre-punching operations for downward pre-punching of the steel plate and negative pre-punching operations for upward pre-punching. One positive pre-punching operation and one negative pre-punching operation constitute a group of pre-punching steps. There are several groups of pre-punching steps, and a group of pre-punching steps is set in the same progressive step.

[0015] The preferred technical solution is that step S200 includes:

[0016] S210. After the steel plate with positioning holes is progressively fed, it is punched and trimmed on one side.

[0017] S220. After the steel plate with one side punched and cut is stepped, the other side is punched and cut.

[0018] The preferred technical solution is that step S300 includes:

[0019] S310. After the steel plate has been punched and trimmed, it is then subjected to an upward flanging process.

[0020] S320. After the steel plate with the upper flange is stepped up, the lower flange is then processed.

[0021] S330. The steel plate with the under-flanged edge is progressively shaped to fully deform the product.

[0022] S340. Trim the edges of the shaped steel plate after it has been shaped.

[0023] A preferred technical solution is that step S200 and / or step S300 include several empty steps.

[0024] A preferred technical solution is that the pre-punching step is achieved through the following forward and reverse punching dies: comprising several sets of unit dies, each unit die including a lifting upper die base and a fixed lower die base, the upper die base being provided with a forward punching component, and the lower die base being provided with a reverse punching component, the unit die including three working positions: in the first working position, the upper die base and the lower die base are separated, and the forward punching component and the reverse punching component are not working; in the second working position, the upper die base and the lower die base are adjacent, the forward punching component performs forward punching on the steel plate, and the reverse punching component is not working; in the third working position, the upper die base and the lower die base are adjacent, the forward punching component is not working, and the reverse punching component performs reverse punching on the steel plate.

[0025] A preferred technical solution is that the positive punch assembly includes a positive punch head, which is movably connected to the upper die holder, and a first switching component is provided between the positive punch head and the upper die holder and the lower die holder for switching the positive punch head from a second working position to a third working position; the negative punch assembly includes a negative punch head, which is movably connected to the lower die holder, and a second switching component is provided between the negative punch head and the upper die holder and the lower die holder for switching the negative punch head from a second working position to a third working position.

[0026] A preferred technical solution is that the upper die holder is provided with a first receiving hole, the first receiving hole is vertically extended, and the punch is slidably connected to the first receiving hole; in the second working position, the punching end of the punch is located outside the first receiving hole, and in the third working position, the punching end of the punch is located inside the first receiving hole.

[0027] A preferred technical solution is that the first switching component includes a first slide groove disposed in the upper mold base and a first slider slidably connected to the first slide groove. The extension direction of the first slide groove is horizontal and communicates with the first receiving hole. In the second working position, the abutting part of the first slider is located in the first receiving hole, and the abutting end of the positive punch abuts against the first slider. In the third working position, the first slider is separated from the first receiving hole, and the positive punch slides in the first receiving hole.

[0028] A preferred technical solution is that the lower die holder is provided with a second receiving hole, the extension direction of the second receiving hole is vertically arranged, and the back punch is slidably connected to the second receiving hole; in the second working position, the punching end of the back punch is located inside the second receiving hole, and in the third working position, the punching end of the back punch is located outside the second receiving hole.

[0029] A preferred technical solution is that the second switching component includes a second slide groove disposed in the lower mold base and a second slider slidably connected to the second slide groove. The second slide groove extends horizontally and communicates with the second receiving hole. The second slider includes a support platform extending below the back punch and a lifting inclined surface disposed on the support platform. In the second working position, the second slider closes the second receiving hole, and the opening of the second receiving hole cooperates with the second slider to form a die. The abutting end of the back punch contacts the support platform. In the third working position, the second slider separates from the second receiving hole, and the abutting end of the back punch abuts against the lifting inclined surface.

[0030] A preferred technical solution further includes a first reset component for resetting the first slider from the third working position to the second working position.

[0031] A preferred technical solution further includes a second reset component for resetting the second slider from the third working position to the second working position.

[0032] A preferred technical solution includes a limiting plate for fixing the steel plate in the second working position and the third working position.

[0033] A preferred technical solution is that, along the progressive direction, the diameter of the punch of the forward punch and the punch of the next set of unit dies is not less than the diameter of the punch of the forward punch and the punch of the previous set of unit dies, and / or the pre-punch depth of the punch of the forward punch and the punch of the next set of unit dies is not less than the pre-punch depth of the punch of the forward punch and the punch of the previous set of unit dies.

[0034] A preferred technical solution is that the first switching component further includes a first insert block fixedly disposed on the lower mold base and a first switching groove formed on the bottom surface of the first slider; the first switching groove includes a first inclined surface, the first inclined surface gradually extends from the opening of the first switching groove to the bottom of the groove and the extending direction is toward the first sliding groove, and the length of the projection of the first inclined surface on the horizontal plane is not less than the diameter of the first receiving hole; the first insert block is provided with a second inclined surface that slides and engages with the first inclined surface.

[0035] A preferred technical solution is that the second switching component further includes a second insert block fixedly disposed on the upper mold base and a second switching groove formed on the top surface of the second slider; the second switching groove includes a third inclined surface, the third inclined surface gradually extends from the opening of the second switching groove to the bottom of the groove and the extending direction is towards the second sliding groove, and the length of the projection of the third inclined surface on the horizontal plane is not less than the diameter of the second receiving hole; the second insert block is provided with a fourth inclined surface that slides and engages with the third inclined surface.

[0036] The advantages and beneficial effects of this invention are as follows: The forming process of the sub-instrument panel cup holder bracket of this invention is reasonably designed. By setting forward punching components and reverse punching components in the same unit mold, the steel plate is pre-impacted at the final hole forming point, causing elastic deformation or plastic deformation of the steel plate. The forward punching and reverse punching of the steel plate can be completed in one mold closing of the upper mold base and the lower mold base, which accelerates the deformation at the hole forming point of the steel plate and increases the number of deformations, thereby generating metal fatigue at the hole forming point of the steel plate. The punching force of the final punching is greatly reduced, and the service life of the punch is improved. As the steel plate progresses to the next station, the diameter of the forward punching and reverse punching and the pre-punching depth gradually increase, thereby ensuring the service life of the punch at each progressive station. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the progressive die structure for the sub-dashboard cup holder bracket molding process of the present invention;

[0038] Figure 2 This is a schematic diagram of the structure in the first working position of an embodiment of the sub-dashboard cup holder bracket molding process of the present invention;

[0039] Figure 3 yes Figure 2 An explosion diagram;

[0040] Figure 4 yes Figure 2 A sectional view;

[0041] Figure 5 yes Figure 3 A sectional view;

[0042] Figure 6 This is a schematic diagram of the second slider;

[0043] Figure 7 This is a schematic diagram of the structure in the second working position of an embodiment of the sub-dashboard cup holder bracket molding process of the present invention;

[0044] Figure 8 yes Figure 7 A sectional view;

[0045] Figure 9 This is a schematic diagram of the structure in the third working position of an embodiment of the sub-instrument panel cup holder bracket molding process of the present invention;

[0046] Figure 10 yes Figure 9 A sectional view;

[0047] Figure 11 This is a schematic diagram of the steel plate structure in a progressive die;

[0048] Figure 12 This is an exploded view of the upper mold base according to another specific embodiment of the present invention;

[0049] Figure 13 yes Figure 12 A sectional view;

[0050] Figure 14 This is a schematic diagram of the structure of the positive punch in the second working position according to another specific embodiment of the present invention;

[0051] Figure 15 yes Figure 14 A sectional view;

[0052] Figure 16 This is a schematic diagram of the internal structure of the upper mold base;

[0053] Figure 17 This is a schematic diagram of the internal structure in the third working position of another specific embodiment of the present invention;

[0054] Figure 18 yes Figure 17 Schematic diagram of the middle and lower shell structure;

[0055] In the figure: 100, upper die base; 110, first receiving hole; 120, first slide groove; 130, second insert block; 131, fourth inclined surface; 140, placement groove; 150, ball bearing assembly; 200, lower die base; 210, second receiving hole; 220, second slide groove; 230, first insert block; 231, second inclined surface; 300, positive punch; 310, rotating roller; 320, first punch end; 330, first abutment end; 400, negative punch; 410, bearing inclined surface; 420, second punch end; 430 ...440, fourth inclined surface; 150, fourth inclined surface; 160, fourth inclined surface; 170, fourth inclined surface; 180, fourth inclined surface; 190, fourth inclined surface; 100, fourth inclined surface; 120, fourth inclined surface; 190, fourth inclined surface; 120, fourth inclined surface; 190, fourth inclined surface; 120, fourth inclined surface; 190, fourth inclined surface; 190, fourth inclined surface; 190, fourth inclined surface; 190, fourth inclined surface; 190, fourth inclined surface; 190, fourth inclined surface; 190, fourth inclined surface; 190, fourth inclined surface; 190, fourth inclined surface; 190, fourth inclined Two abutting ends; 500, first slider; 510, first switching groove; 511, first inclined surface; 520, abutting part; 600, second slider; 610, second switching groove; 611, third inclined surface; 620, support platform; 630, lifting inclined surface; 640, groove; 650, guide block; 700, upper shell; 710, first elastic element; 800, lower shell; 810, second elastic element; 820, guide groove; 830, compression spring seat; 900, limiting plate; 910, third elastic element; a, press; b, progressive die. Detailed Implementation

[0056] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0057] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "horizontal," "vertical," "top," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] Example

[0059] like Figure 1-11 As shown, the molding process of the sub-dashboard cup holder in this embodiment includes the following steps:

[0060] S100, blanking punch positioning hole;

[0061] S200: After the steel plate with positioning holes is progressively fed, it is punched and trimmed.

[0062] S300, After the steel plate is punched and trimmed, it is then subjected to flanging treatment;

[0063] S400: After the steel plate is flanged, small holes are punched in it.

[0064] S500: After the steel plate with small holes is punched, it is separated and cut off in a progressive manner.

[0065] Between steps S100 and / or steps S200 and / or steps S300 and / or steps 100 to 400, there are positive pre-punching operations for downward pre-punching of the steel plate and negative pre-punching operations for upward pre-punching. One positive pre-punching operation and one negative pre-punching operation constitute a group of pre-punching steps. There are several groups of pre-punching steps, and a group of pre-punching steps is set in the same progressive step.

[0066] With this design, the pre-punching step can be completed with each closing of the upper and lower dies. The positive pre-punching operation and the reverse pre-punching operation are performed sequentially on the final hole, causing metal fatigue in the steel plate at the final hole. The punching force of the final punch is greatly reduced, and the service life of the punch is improved.

[0067] Specifically, step S200 includes:

[0068] S210. After the steel plate with positioning holes is progressively fed, it is punched and trimmed on one side.

[0069] S220. After the steel plate with one side punched and cut is stepped, the other side is punched and cut.

[0070] Specifically, step S300 includes:

[0071] S310. After the steel plate has been punched and trimmed, it is then subjected to an upward flanging process.

[0072] S320. After the steel plate with the upper flange is stepped up, the lower flange is then processed.

[0073] S330. The steel plate with the under-flanged edge is progressively shaped to fully deform the product.

[0074] S340. Trim the edges of the shaped steel plate after it has been shaped.

[0075] Furthermore, step S200 and / or step S300 include several empty steps.

[0076] With this design, since the progressive process is constant each time, when the mold required for the previous step is large, there is no space to install the mold for the corresponding step in the next step, so this step can be arranged as an empty step.

[0077] The positive and negative punch dies used in the pre-punching step of the sub-instrument panel cup holder forming process include several sets of unit dies. Each unit die includes a lifting upper die base 100 and a fixed lower die base 200. The upper die base 100 is equipped with a positive punch component, and the lower die base 200 is equipped with a negative punch component. The unit die has three working positions: In the first working position, the upper die base 100 and the lower die base 200 are separated, and the positive punch component and the negative punch component are not working; In the second working position, the upper die base 100 and the lower die base 200 are in contact, the positive punch component performs a positive punching operation on the steel plate, and the negative punch component is not working; In the third working position, the upper die base 100 and the lower die base 200 are in contact, the positive punch component is not working, and the negative punch component performs a negative punching operation on the steel plate.

[0078] With this design, the pre-punching step is achieved through the cooperation of the upper die holder 100, the lower die holder 200, the positive punch assembly, and the negative punch assembly. From the initial first working position, as the press drives the upper die holder 100 to press down, it reaches the second working position. The positive punch assembly performs pre-punching positive punching operation on the final hole of the steel plate. As the press continues to drive the upper die holder 100 to press down, it reaches the third working position. The positive punch assembly disengages from the steel plate, and the negative punch assembly performs pre-punching negative punching operation on the final hole of the steel plate. Subsequently, as the press resets, the upper die holder 100 rises and resets from the third working position to the first working position.

[0079] Specifically, the punch assembly includes a punch 300, which is movably connected to the upper die holder 100. A first switching component is provided between the punch 300 and the upper die holder 100 and the lower die holder 200 for switching the punch 300 from the second working position to the third working position.

[0080] With this design, the forward punch 300 achieves pre-punching and forward punching of the steel plate.

[0081] Specifically, the backflush assembly includes a backflush punch 400, which is movably connected to the lower die holder 200. A second switching assembly is provided between the backflush punch 400 and the upper die holder 100 and the lower die holder 200 for switching the backflush punch 400 from the second working position to the third working position.

[0082] Through this design, the back-jet punch 400 achieves pre-jet and back-jet of the steel plate.

[0083] Specifically, the upper die holder 100 is provided with a first receiving hole 110, the first receiving hole 110 is vertically extended, and the punch 300 is slidably connected to the first receiving hole 110; in the second working position, the first punching end 320 of the punch 300 is located outside the first receiving hole 110, and in the third working position, the first punching end 320 of the punch 300 is located inside the first receiving hole 110.

[0084] This design achieves the goal of having the punch 300 work in the second working position and not work in the third working position.

[0085] Specifically, the first switching component includes a first slide groove 120 disposed in the upper mold base 100 and a first slider 500 slidably connected to the first slide groove 120. The extension direction of the first slide groove 120 is horizontal and communicates with the first receiving hole 110. In the second working position, the abutting part 520 of the first slider 500 is located in the first receiving hole 110, and the first abutting end 330 of the positive punch 300 is abutting against the first slider 500. In the third working position, the first slider 500 is separated from the first receiving hole 110, and the positive punch 300 slides in the first receiving hole 110.

[0086] With this design, in the second working position, the abutting part of the punch 300 abuts against the abutting part 520 of the first slider 500 to ensure that the punch 300 can pre-punch the steel plate; as the first slider 500 slides outward, the first slider 500 disengages from the punch 300, the punch 300 is not under pressure, and can freely rise and fall within the first receiving hole 110, and the punch 300 is in the third working position.

[0087] Furthermore, a rotating roller 310 is rotatably provided on the contact part of the punch 300, and the rotation axis of the rotating roller 310 is perpendicular to the sliding direction of the first slider 500.

[0088] This design reduces the sliding friction between the first slider 500 and the punch 300.

[0089] Specifically, the first switching component also includes a first insert block 230 fixedly disposed on the lower mold base 200 and a first switching groove 510 formed on the bottom surface of the first slider 500; the first switching groove 510 includes a first inclined surface 511, which gradually extends from the opening of the first switching groove 510 to the bottom of the groove and the extending direction is toward the first sliding groove 120, and the length of the projection of the first inclined surface 511 on the horizontal plane is not less than the diameter of the first receiving hole 110; the first insert block 230 is provided with a second inclined surface 231 that slides and engages with the first inclined surface 511.

[0090] With this design, as the upper mold base 100 descends, the second inclined surface 231 of the first insert block 230 abuts against the first inclined surface 511 of the first slider 500. As the upper mold base 100 continues to descend, since the position of the first insert block 230 in the horizontal direction remains unchanged, the first slider 500 slides in the horizontal direction away from the first receiving hole 110 under the mutual sliding cooperation of the second inclined surface 231 and the first inclined surface 511.

[0091] Specifically, the angle between the first inclined plane 511 and the horizontal plane is 30 degrees. This design ensures that the horizontal movement distance of the first slider 500 is greater than the vertical movement distance, therefore the thickness of the first slider 500 does not need to be too thick.

[0092] Specifically, the lower die holder 200 is provided with a second receiving hole 210, the extension direction of the second receiving hole 210 is vertical, and the back punch 400 is slidably connected to the second receiving hole 210; in the second working position, the second punching end 420 of the back punch 400 is located inside the second receiving hole 210, and in the third working position, the second punching end 420 of the back punch 400 is located outside the second receiving hole 210.

[0093] This design achieves the goal of the recoil punch 400 not working in the second working position and working in the third working position.

[0094] Specifically, the second switching component includes a second slide groove 220 disposed in the lower mold base 200 and a second slider 600 slidably connected to the second slide groove 220. The extension direction of the second slide groove 220 is horizontal and communicates with the second receiving hole 210. The second slider 600 includes a support platform 620 extending below the back punch 400 and a lifting inclined surface 630 disposed on the support platform 620. In the second working position, the second slider 600 closes the second receiving hole 210. The opening of the second receiving hole 210 and the second slider 600 cooperate to form a die. The second abutting end 430 of the back punch 400 is in contact with the support platform 620. In the third working position, the second slider 600 is separated from the second receiving hole 210, and the second abutting end 430 of the back punch 400 abuts against the lifting inclined surface 630.

[0095] With this design, in the second working position, the back punch 400 is located in the second receiving hole 210 and is supported by the support table 620. As the second slider 600 slides away from the second receiving hole 210, the lifting inclined surface 630 abuts against the back punch 400 and drives the back punch 400 to rise, so as to perform pre-punching and back-punching operations on the steel plate.

[0096] Specifically, the second switching assembly also includes a second insert block 130 fixedly disposed on the upper mold base 100 and a second switching groove 610 opened on the top surface of the second slider 600; the second switching groove 610 includes a third inclined surface 611, which gradually extends from the opening of the second switching groove 610 to the bottom of the groove and the extending direction is towards the second sliding groove 220, and the length of the projection of the third inclined surface 611 on the horizontal plane is not less than the diameter of the second receiving hole 210; the second insert block 130 is provided with a fourth inclined surface 131 that slides and engages with the third inclined surface 611.

[0097] With this design, as the upper mold base 100 descends, the fourth inclined surface 131 of the second insert block 130 abuts against the third inclined surface 611 of the second slider 600. As the upper mold base 100 continues to descend, since the position of the second insert block 130 in the horizontal direction remains unchanged, the second slider 600 slides in the horizontal direction away from the second receiving hole 210 under the mutual sliding cooperation of the fourth inclined surface 131 and the third inclined surface 611.

[0098] Furthermore, the second slider 600 is provided with a groove 640, the groove 640 is extended upward, and in the second working position, the second punch end 420 of the back punch 400 is adjacent to or in contact with the bottom of the groove 640.

[0099] The rising distance of the back punch 400 is consistent with the groove depth of the second switching groove 610. Since the groove depth of the second switching groove 610 must be less than the thickness of the second slider 600, if there is no groove 640, the back punch 400 cannot switch from the second working position to the third working position. Therefore, through this design, the distance between the back punch 400 and the top of the lower die holder 200 can be reduced, thereby ensuring that the back punch 400 can smoothly protrude out of the second receiving hole 210.

[0100] Furthermore, it also includes a first reset component for resetting the first slider 500 from the third working position to the second working position.

[0101] With this design, when the press and the upper die holder 100 are reset to the first working position, the first slider 500 and the punch 300 can be automatically reset.

[0102] Specifically, the first reset assembly includes an upper housing 700 sleeved outside the upper mold base 100, and a first elastic element 710 is sandwiched between the inner wall of the upper housing 700 and the side wall of the first slider 500.

[0103] With this design, as the upper die holder 100 rises, the punch 300 automatically descends under gravity, and the first slider 500 resets under the action of the first elastic element 710, closing the first receiving hole 110. The first elastic element 710 can be a compression spring.

[0104] Furthermore, it also includes a second reset component for resetting the second slider 600 from the third working position to the second working position.

[0105] With this design, when the press and the upper die holder 100 are reset to the first working position, the second slide block 600 and the back punch 400 can be automatically reset.

[0106] Specifically, the second reset assembly includes a lower housing 800 sleeved outside the lower mold base 200, and a second elastic element 810 is sandwiched between the inner wall of the lower housing 800 and the side wall of the second slider 600.

[0107] With this design, as the upper die holder 100 rises, the punch 400 automatically descends under gravity, and the second slider 600 resets under the action of the second elastic element 810, closing the second receiving hole 210. The second elastic element 810 can be a compression spring.

[0108] Specifically, it also includes a limiting plate 900 for fixing the steel plate in the second working position and the third working position, and a third elastic element 910 is sandwiched between the limiting plate 900 and the upper housing 700.

[0109] This design ensures the steel plate's position is fixed during pre-stamping. The third elastic element 910 can be a nitrogen spring.

[0110] Along the progressive direction, the punch diameter of the forward punch and the reverse punch of the next set of unit dies is not less than the punch diameter of the forward punch and the reverse punch of the previous set of unit dies and / or the pre-punch depth of the forward punch and the reverse punch of the next set of unit dies is not less than the pre-punch depth of the forward punch and the reverse punch of the previous set of unit dies.

[0111] Through this design, the pre-punching boss gradually becomes larger and deeper in a step-by-step manner, causing metal fatigue in the steel plate at the final hole, greatly reducing the punching force of the final punch, and ensuring the service life of the forward punch and reverse punch at each progressive station.

[0112] The pre-flush process includes the following steps:

[0113] S1. The forward punch assembly punches the steel plate forward, forming an upper concave portion; the reverse punch assembly punches the steel plate backward, forming a lower concave portion, while the upper concave portion remains unchanged or is flattened.

[0114] S2. The steel plate is progressively moved to the next station. The forward punching assembly of the next station punches the steel plate to form an upper concave part with a larger diameter and / or an upper concave part with a deeper groove. The reverse punching assembly punches the steel plate to form a lower concave part with a larger diameter and / or a lower concave part with a deeper groove. The upper concave part remains unchanged, is flattened, or is punched upward to form an upper boss.

[0115] S3. As the steel plate is progressively moved to the next station, the diameter and groove depth of the upper concave part gradually increase, and the diameter and groove depth of the lower concave part also gradually increase, forming an upwardly convex upper boss on the surface of the steel plate.

[0116] The specific usage of the embodiment is as follows:

[0117] In the initial state, the upper die holder 100 and the lower die holder 200 are separated. The positive punch 300 and the negative punch 400 are located in the first working position. The first elastic element 710 and the second elastic element 810 are in their natural state. The first slider 500 is partially located in the first receiving hole 110, and the second slider 600 is partially located in the second receiving hole 210. The first abutting end 330 of the positive punch 300 abuts against the first slider 500. The punching end of the positive punch 300 protrudes from the lower end of the upper die holder 100. The second abutting end 430 of the negative punch 400 is located on the support platform 620, and the punching end of the negative punch 400 is located in the groove 640.

[0118] As the press drives the upper die base 100 to descend, the unit die transitions from the first working position to the second working position. The limiting plate 900 abuts against the steel plate and fixes the steel plate on the lower die base 200. The second inclined surface 231 abuts against and slides against the first inclined surface 511, driving the first slider 500 to slide away from the first receiving hole 110. When the punching end of the punching head 300 abuts against the upper surface of the steel plate and performs a punching operation, only the punching part 520 of the first slider 500 is located in the first receiving hole 110, abutting against the first abutting end 330 of the punching head 300. The fourth inclined surface 131 abuts against the third inclined surface 611. As the second insert block 130 descends, it drives the second slider 600 to slide away from the second receiving hole 210, gradually exposing the second receiving hole 210.

[0119] As the press continues to drive the upper die holder 100 downward, the unit die transitions from the second working position to the third working position. The first slider 500 completely disengages from the first receiving hole 110, and the positive punch 300 can move up and down completely within the first receiving hole 110. The lifting inclined surface 630 abuts against the second abutting end 430 of the negative punch 400. As the lifting inclined surface 630 slides towards the second receiving hole 210, it lifts up the negative punch 400. The punching end of the negative punch 400 performs a negative punching operation on the steel plate (the operation of the positive punch 300 and the operation of the negative punch 400 have a sequential order and a time interval between them).

[0120] As the press drives the upper die holder 100 to rise, the unit die resets from the third working position to the first working position. Under the action of the second elastic element 810 and gravity, the back punch 400 falls and the second slide block 600 resets. As the upper die holder 100 continues to rise, under the action of the first elastic element 710 and gravity, the forward punch 300 falls and the first slide block 500 resets.

[0121] In one specific implementation, the molding process of the sub-dashboard cup holder includes the following steps:

[0122] OP10, punch positioning holes for blanking and complete the pre-punching step;

[0123] OP20: After the steel plate with positioning holes is progressively punched, the edge is cut on one side and the pre-punching step is completed;

[0124] OP30, Empty Step;

[0125] OP40: After the steel plate with one side punched and cut is stepped, the other side punched and cut is performed, and the pre-punching step is completed;

[0126] OP50, empty step;

[0127] OP60: After the steel plate has been punched and trimmed, it is then subjected to an upward flanging process.

[0128] OP70, stepless;

[0129] OP80: After the steel plate with the upper flange is stepped up, the lower flange is then processed.

[0130] OP90, empty step;

[0131] OP100: The steel plate with the under-flanged edge is progressively shaped to fully deform the product and complete the pre-punching step;

[0132] OP110. After the shaped steel plate is stepped forward, the edges are trimmed and the pre-punching step is completed.

[0133] OP120: After the steel plate is flanged, small holes are punched in it.

[0134] OP130: After the steel plate with small holes is punched, it is separated and cut off.

[0135] The steel plate is 3.0mm thick, and the OP120 punch diameter is 3.6mm.

[0136] In OP10, the punch diameter of the forward punch 300 and the reverse punch 400 is 2.5mm, the depth of the punched boss is 0.5mm, and the force for punching the boss is 5.6kN.

[0137] In OP20, the punch diameter of the forward punch 300 and the reverse punch 400 is 2.8mm, the depth of the punched boss is 0.8mm, and the force for punching the boss is 6.5kN.

[0138] In OP40, the punch diameter of the forward punch 300 and the reverse punch 400 is 3.0mm, the depth of the punched boss is 1.0mm, and the force for punching the boss is 7.0kN.

[0139] In OP100, the punch diameter of the forward punch 300 and the reverse punch 400 is 3.2mm, the depth of the punched boss is 1.0mm, and the force for punching the boss is 7.5kN.

[0140] In OP110, the punch diameter of the forward punch 300 and the reverse punch 400 is 3.4mm, the depth of the punched boss is 1.0mm, and the force for punching the boss is 7.9kN.

[0141] After the above pre-punching steps, the force required for punching small holes with OP120 is 8.4kN. Compared with the 10.0kN punching force required for directly punching small holes, the punching force required by OP120 is significantly reduced, which improves the service life of the punch in OP120.

[0142] like Figure 12-16 As shown, in another specific embodiment, in order to ensure that the punch 300 does not deviate slightly due to the sliding gap between the punch 300 and the first receiving hole 110 during the pre-punch punch, and to ensure the accuracy of the pre-punch punch, the punch 300 and the first receiving hole 110 are connected by ball bearings.

[0143] The inner wall of the first receiving hole 110 is provided with a placement groove 140, and a ball assembly 150 is provided in the placement groove 140. The balls of the ball assembly 150 abut against and roll with the side wall of the punch 300. Thus, the up and down movement of the punch 300 is completely limited by the ball assembly 150, ensuring that the punch 300 moves straight up and down without any slight deviation.

[0144] like Figure 17-18 In another specific embodiment, a guide block 650 and a guide groove 820 are provided between the support platform 620 and the lower housing 800, and the extending direction of the guide groove 820 is parallel to the sliding direction of the second slider 600.

[0145] This design further ensures the stability of the second slider 600's sliding motion.

[0146] To ensure the stability of the first elastic element 710 and the second elastic element 810 during compression, the lower housing 800, the second slider 600, the upper housing 700, and the first slider 500 are all provided with compression spring seats 830.

[0147] The recoil punch 400 is provided with a bearing ramp 410 that slides in conjunction with the lifting ramp 630. This design makes the recoil punch 400 more stable to be lifted by the surface contact between the bearing ramp 410 and the lifting ramp 630 compared to the point contact between the recoil punch 400 and the lifting ramp 630.

[0148] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A molding process for a sub-dashboard cup holder bracket, characterized in that, Includes the following steps: S100, blanking punch positioning hole; S200: After the steel plate with positioning holes is progressively fed, it is punched and trimmed. S300, After the steel plate is punched and trimmed, it is then subjected to flanging treatment; S400: After the steel plate is flanged, small holes are punched in it. S500: After the steel plate with small holes is punched, it is separated and cut off in a progressive manner. Between steps S100 and / or steps S200 and / or steps S300 and / or steps 100 to 400, there are positive pre-punching operations for downward pre-punching of the steel plate and negative pre-punching operations for upward pre-punching. One positive pre-punching operation plus one negative pre-punching operation constitutes a pre-punching step. There are several sets of pre-punching steps, and a set of pre-punching steps is set in the same progressive step. The pre-punching step is achieved through the following forward and reverse punching dies: including several sets of unit dies, each unit die including a lifting upper die base (100) and a fixed lower die base (200), the upper die base (100) is provided with a forward punching component, the lower die base (200) is provided with a reverse punching component, and the unit die includes three working positions: in the first working position, the upper die base (100) and the lower die base (200) are separated, and the forward punching component and the reverse punching component are not working; in the second working position, the upper die base (100) and the lower die base (200) are adjacent, the forward punching component performs forward punching operation on the steel plate, and the reverse punching component is not working; in the third working position, the upper die base (100) and the lower die base (200) are adjacent, the forward punching component is not working, and the reverse punching component performs reverse punching operation on the steel plate; The positive punch assembly includes a positive punch (300) movably connected to the upper die holder (100). A first switching component for switching the positive punch (300) from a second working position to a third working position is provided between the positive punch (300) and the upper die holder (100) and the lower die holder (200). The negative punch assembly includes a negative punch (400) movably connected to the lower die holder (200). A second switching component for switching the negative punch (400) from a second working position to a third working position is provided between the negative punch (400) and the upper die holder (100) and the lower die holder (200). The upper die holder (100) is provided with a first receiving hole (110), the first receiving hole (110) is vertically extended, and the positive punch (300) is slidably connected to the first receiving hole (110); The first switching component includes a first slide groove (120) disposed in the upper mold base (100) and a first slider (500) slidably connected to the first slide groove (120). The first slide groove (120) extends horizontally and communicates with the first receiving hole (110). The lower die holder (200) is provided with a second receiving hole (210), the second receiving hole (210) is vertically extended, and the back punch (400) is slidably connected to the second receiving hole (210); The second switching component includes a second slide groove (220) disposed in the lower mold base (200) and a second slider (600) slidably connected to the second slide groove (220). The second slide groove (220) is horizontally positioned and communicates with the second receiving hole (210). The second slider (600) includes a support platform (620) extending below the back punch (400) and a lifting inclined surface (630) disposed on the support platform (620). Along the progressive direction, the punch diameter of the forward punch and the reverse punch of the next set of unit dies is not less than the punch diameter of the forward punch and the reverse punch of the previous set of unit dies and / or the pre-punch depth of the forward punch and the reverse punch of the next set of unit dies is not less than the pre-punch depth of the forward punch and the reverse punch of the previous set of unit dies. The first switching assembly further includes a first insert (230) fixedly disposed on the lower mold base (200) and a first switching groove (510) formed on the bottom surface of the first slider (500); the first switching groove (510) includes a first inclined surface (511), the first inclined surface (511) gradually extends from the opening of the first switching groove (510) to the bottom of the groove and the extending direction is toward the first sliding groove (120), and the length of the projection of the first inclined surface (511) on the horizontal plane is not less than the diameter of the first receiving hole (110); the first insert (230) is provided with a second inclined surface (231) that slides and engages with the first inclined surface (511). The second switching assembly further includes a second insert (130) fixedly disposed on the upper mold base (100) and a second switching groove (610) opened on the top surface of the second slider (600); the second switching groove (610) includes a third inclined surface (611), the third inclined surface (611) gradually extends from the opening of the second switching groove (610) to the bottom of the groove and the extending direction is toward the second sliding groove (220), and the length of the projection of the third inclined surface (611) on the horizontal plane is not less than the diameter of the second receiving hole (210); the second insert (130) is provided with a fourth inclined surface (131) that slides and engages with the third inclined surface (611).

2. The molding process for the sub-dashboard cup holder bracket according to claim 1, characterized in that, Step S200 includes: S210. After the steel plate with positioning holes is progressively fed, it is punched and trimmed on one side. S220. After the steel plate with one side punched and cut is stepped, the other side is punched and cut.

3. The molding process for the sub-dashboard cup holder bracket according to claim 1, characterized in that, Step S300 includes: S310. After the steel plate has been punched and trimmed, it is then subjected to an upward flanging process. S320. After the steel plate with the upper flange is stepped up, the lower flange is then processed. S330. The steel plate with the under-flanged edge is progressively shaped to fully deform the product. S340. Trim the edges of the shaped steel plate after it has been shaped.

4. The molding process for the sub-dashboard cup holder bracket according to claim 1, characterized in that, Step S200 and / or step S300 include several empty steps.

5. The molding process for the sub-dashboard cup holder bracket according to claim 1, characterized in that, In the second working position, the first punching end (320) of the punching head (300) is located outside the first receiving hole (110), and in the third working position, the first punching end (320) of the punching head (300) is located inside the first receiving hole (110).

6. The molding process for the sub-dashboard cup holder bracket according to claim 5, characterized in that, In the second working position, the abutting part (520) of the first slider (500) is located in the first receiving hole (110), and the first abutting end (330) of the positive punch (300) is abutting against the first slider (500). In the third working position, the first slider (500) is separated from the first receiving hole (110), and the positive punch (300) slides in the first receiving hole (110).

7. The molding process for the sub-dashboard cup holder bracket according to claim 1, characterized in that, In the second working position, the second punch end (420) of the back punch (400) is located inside the second receiving hole (210), and in the third working position, the second punch end (420) of the back punch (400) is located outside the second receiving hole (210).

8. The molding process for the sub-dashboard cup holder bracket according to claim 7, characterized in that, In the second working position, the second slider (600) closes the second receiving hole (210), and the opening of the second receiving hole (210) cooperates with the second slider (600) to form a die. The second abutting end (430) of the back punch (400) is in contact with the support table (620). In the third working position, the second slider (600) separates from the second receiving hole (210), and the second abutting end (430) of the back punch (400) abuts with the lifting inclined surface (630).

9. The molding process for the sub-dashboard cup holder bracket according to claim 6, characterized in that, It also includes a first reset component for resetting the first slider (500) from the third working position to the second working position.

10. The molding process for the sub-dashboard cup holder bracket according to claim 8, characterized in that, It also includes a second reset component for resetting the second slider (600) from the third working position to the second working position.

11. The molding process for the sub-dashboard cup holder bracket according to claim 1, characterized in that, It also includes a limiting plate (900) for fixing the steel plate in the second working position and the third working position.

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