Folding stamping dies and equipment for producing folding products

Abstract

The present invention discloses a hemming stamping die and hemming product production equipment, which relates to the technical field of hemming product manufacturing. The hemming stamping die includes a lower die assembly and an upper die assembly, the lower die assembly includes a lower template and a bending lower die; the upper die assembly includes an upper die component, a pressure plate and a hemming component, the upper die component is suitable for driving the pressure plate and the hemming component to move downward, and driving the hemming component to move in a horizontal direction; the hemming component is suitable for bending a workpiece placed on the lower die assembly to form a side hemming during the process of moving downward from a first station to a second station; the bending lower die is suitable for moving downward to an avoidance position after the side hemming is bent into place, so as to make way for an avoidance space for the hemming component to move from the second station to the third station; the pressure plate is suitable for moving downward to a preset position when the hemming component is in the third station to flatten the side hemming to form an hemming. The technical solution of the present invention completes the hemming process through a single-sequence die, reduces costs, and improves production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing folded edge products, in particular to a folded edge stamping die and folded edge product production equipment. Background Art

[0002] In the related art, the production of overlapped products generally requires two processes: stamping and overlapped edges. The production efficiency is low, and each process requires a mold. The mold cost is high, resulting in high production costs of the product. Summary of the Invention

[0003] The main purpose of the present invention is to provide a stacking stamping die and stacking product production equipment, aiming to complete the stamping and stacking processes through a single die, reduce costs and improve production efficiency.

[0004] To achieve the above-mentioned purpose, the present invention provides a folding stamping die, comprising:

[0005] A lower die assembly, comprising a lower die plate and a bending lower die, wherein the bending lower die can move up and down relative to the lower die plate; and

[0006] An upper mold assembly is movably arranged above the lower mold assembly, and the upper mold assembly includes an upper mold part, and a pressure plate and a stacking part arranged at the lower part of the upper mold part, the pressure plate is arranged opposite to the lower mold plate, and the stacking part is arranged opposite to the bending lower mold, and the stacking part can move horizontally relative to the upper mold part to approach or move away from the pressure plate; the upper mold part is suitable for driving the pressure plate and the stacking part to move downward, and driving the stacking part to move horizontally;

[0007] The stacking component comprises a first station, a second station and a third station, wherein the second station is arranged below the first station, and the third station is arranged horizontally on a side of the second station close to the pressing plate;

[0008] The folding component is suitable for bending the workpiece placed on the lower mold assembly to form a side fold during the process of moving downward from the first station to the second station; the bending lower mold is suitable for moving downward to an avoidance position after the side fold is bent into place, so as to make way for the folding component to move from the second station to the third station. The pressing plate is suitable for moving downward to a preset position when the folding component is in the third station to flatten the side fold to form a fold.

[0009] In one embodiment, the folding component includes a main body and a forming part provided at the bottom of the main body, the forming part protrudes relative to the main body toward the side close to the pressing plate, the bending lower mold is provided with a contoured cavity adapted to the shape of the forming part, the forming part has a first forming surface and a second forming surface that are bent, the first forming surface is used to cooperate with the inner surface of the contoured cavity to form the side folding edge of the workpiece, and the second forming surface is used to cooperate with the bottom surface of the pressing plate to form the folding edge of the workpiece.

[0010] In one embodiment, the first molding surface and the second molding surface are arranged to extend in a non-linear manner.

[0011] In one embodiment, the upper mold component includes an upper mold base, an upper mold pad, a first elastic member and a second elastic member, the upper mold pad is located between the upper mold base and the pressure plate, the first elastic member connects the upper mold base and the pressure plate, the second elastic member connects the upper mold base and the upper mold pad, the first elastic member is used to make the pressure plate float and rise and fall, the second elastic member is used to make the upper mold pad float and rise and fall, and the folding member can be slidably arranged on the bottom side of the upper mold pad in the horizontal direction.

[0012] In one embodiment, the upper mold part also includes an upper mold knife and a reset elastic mechanism, the reset elastic mechanism elastically abuts against the side of the folding part away from the pressure plate, so that the folding part can reciprocate in the horizontal direction, the upper mold knife is connected to the upper mold base and extends downward, and the upper mold knife is used to drive the folding part to move in the horizontal direction toward the side close to the pressure plate during the downward movement.

[0013] In one embodiment, a driving bevel is provided on the side of the lower end of the upper die insert close to the folding component, and the driving bevel is inclined from top to bottom toward the side away from the folding component, and the folding component is provided with a mating bevel for abutting and mating with the driving bevel.

[0014] In one embodiment, the upper die base is provided with a guide column extending downward, the upper die pad is provided with a guide hole for the guide column to pass through, and the upper die pad is slidably engaged with the guide column;

[0015] And / or, two guide parts that are opposite to each other and spaced apart are provided on the bottom side of the upper mold pad, the folding part is located between the two guide parts, and the guide part is slidably engaged with the folding part.

[0016] In one embodiment, the upper die base is provided with a folding force transmission rod extending downward, and the folding force transmission rod passes through the upper die pad and is connected to the pressure plate.

[0017] In one embodiment, the lower mold assembly also includes a lower mold base, a third elastic member and a fourth elastic member, the third elastic member connects the lower mold base and the lower template, the fourth elastic member connects the lower mold base and the bending lower mold, the third elastic member is used to make the lower template float and rise and fall, the fourth elastic member is used to make the bending lower mold float and rise and fall, the upper mold base is provided with a downward extending hitting rod, the hitting rod is used to drive the bending lower mold downward to the avoidance position during the downward movement.

[0018] In one embodiment, a support column is provided on the top of the lower mold base, and the support column is used to support the folded edge component during the process of flattening the folded edge.

[0019] In one embodiment, the upper mold part also includes a clamping plate arranged between the upper mold pad and the pressure plate, and the lower mold part also includes a lower mold pad arranged between the lower mold base and the lower mold plate. The clamping plate and the lower mold pad are respectively provided with stamping punches, and the pressure plate and the lower mold plate are respectively provided with stamping holes for the stamping punches to pass through.

[0020] The present invention also provides a device for producing folded edge products, comprising the folded edge stamping die described above.

[0021] The technical solution of the present invention is to cooperate with the upper die assembly and the lower die assembly. When the folding stamping die is working, the upper die assembly is first moved from the mold opening state toward the lower die assembly to the pressing position, so that the pressing plate cooperates with the lower template and the bending lower die in the supporting position to press the workpiece; then, the folding component is moved downward along the side of the pressing plate and the bending lower die to bend the edge of the workpiece extending from the side edge of the bending lower die downward by 90 degrees to form a side folding edge; after the bending is completed, the bending lower die is moved downward to the avoidance position to make room for the folding component to move laterally toward the pressing plate and the lower template; then, the folding component is moved laterally toward the pressing plate and the lower template under the action of external force, so that the side folding edge of the workpiece is located in the concave cavity enclosed by the folding component and the pressing plate; finally, the pressing plate continues to press downward and completes the folding edge flattening action at the same time, so that the side folding edge of the workpiece is bent upward to form a folding edge. This allows the stamping and hemming processes to be completed with a single die and press, enabling the production of products with hemmed edges. This reduces production costs and improves efficiency. Furthermore, a single stamping process can be used to bend, flatten, and hem the metal sheet, significantly shortening production time and improving efficiency compared to related technologies that require multiple steps to complete the hemming process. Furthermore, by eliminating the degradation of die precision associated with multiple stamping steps, the product's hem will not open backwards, preventing hem failure, thus improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of an embodiment of a folding stamping die provided by the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the structure of the middle overlap stamping die in the mold open state;

[0025] Figure 3 for Figure 1 A schematic diagram of the structure of the lower die assembly of the middle overlap stamping die;

[0026] Figure 4 for Figure 1 A schematic diagram of the structure of the upper die assembly of the middle overlap stamping die;

[0027] Figure 5 for Figure 4 A schematic structural diagram of the folding components of the middle and upper mold assembly;

[0028] Figure 6 Schematic diagram of the upper mold assembly moving from the mold opening position to the material pressing position;

[0029] Figure 7 It is a schematic diagram of the upper die assembly moving from the pressing position to the bending completion position;

[0030] Figure 8 A schematic diagram of the upper die assembly moving from a bending completion position to a side-pushing preparation position;

[0031] Figure 9 A schematic diagram of the upper mold assembly moving from a side-pushing preparation position to a side-pushing completion position;

[0032] Figure 10 It is a schematic diagram of the upper mold assembly moving from the side push position to the flattening position.

[0033] Description of Figure Numbers:

[0034] 100, folding stamping die; 10, lower die assembly; 11, lower template; 12, bending lower die; 121, contoured cavity; 13, lower die base; 131, support column; 132, second positioning column; 14, third elastic member; 15, fourth elastic member; 16, lower die pad; 20, upper die assembly; 21, press plate; 211, punching hole; 22, folding component; 221, main body; 2211, matching slope; 222 , forming part; 2221, first forming surface; 2222, second forming surface; 23, upper die seat; 231, guide column; 232, folding force transmission rod; 233, hitting rod; 24, upper die pad; 241, guide part; 242, first positioning column; 25, first elastic member; 26, second elastic member; 27, upper die insert; 271, driving inclined surface; 28, resetting elastic mechanism; 29, clamping plate; 291, stamping punch;

[0035] 300, workpiece; 310, side folding edge; 320, overlapping edge.

[0036] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] In the related art, the production of overlapped products generally requires two processes: stamping and overlapped edges. The production efficiency is low, and each process requires a mold. The mold cost is high, resulting in high production costs of the product.

[0041] The present invention proposes a stacking stamping die 100, which can complete the stamping and stacking processes through a single die, reducing costs and improving production efficiency; and the stacking stamping die 100 is not restricted by the shape of the stacking 320, and can be applied to special-shaped stacking edges 320, with wider applicability.

[0042] See also Figure 1 and Figure 2 In one embodiment of the present invention, the folding stamping die 100 includes a lower die assembly 10 and an upper die assembly 20, wherein the upper die assembly 20 is arranged above the lower die assembly 10 in a manner that allows it to be raised and lowered. When the folding stamping die 100 is applied to a production device, the lower die assembly 10 is mounted on a workbench of a press, and the upper die assembly 20 is mounted on a slide of the press. Driven by the slide of the press, the upper die assembly 20 can be raised and lowered to move closer to or away from the lower die assembly 10, thereby enabling the upper die assembly 20 to have an open die state separated from the lower die assembly 10, and a closed die state in cooperation with the lower die assembly 10.

[0043] Combine Figure 3 and Figure 4The lower mold assembly 10 includes a lower mold plate 11 and a bending lower mold 12, and the bending lower mold 12 can move up and down relative to the lower mold plate 11; the upper mold assembly 20 includes an upper mold part, a pressure plate 21 and a stacking part 22, and the pressure plate 21 and the stacking part 22 are arranged at the lower part of the upper mold part, the pressure plate 21 is arranged opposite to the lower mold plate 11, and the stacking part 22 is arranged opposite to the bending lower mold 12, and the stacking part 22 can move horizontally relative to the upper mold part to approach or move away from the pressure plate 21; the upper mold part is suitable for driving the pressure plate 21 and the stacking part 22 to move downward, and driving the stacking part 22 to move horizontally.

[0044] The lower mold plate 11 and the bending lower mold 12 of the lower mold assembly 10 are arranged side by side in a horizontal direction (e.g., left-right direction), and the bending lower mold 12 can move up and down relative to the lower mold plate 11, so that the bending lower mold 12 has a supporting position for cooperating with the lower mold plate 11 to jointly support the workpiece 300, and a avoiding position for moving downward a preset distance relative to the lower mold plate 11. In a natural state, the bending lower mold 12 is in the supporting position (e.g., Figure 6 As shown), at this time, the top surface of the bending lower die 12 is substantially flush with the top surface of the lower template 11 to form a support surface for supporting the workpiece 300. When the bending lower die 12 is subjected to a downward force, the bending lower die 12 can move downward relative to the lower template 11 to a avoidance position (as shown). Figure 8 As shown, the top surface of the bending lower die 12 is offset from the top surface of the lower die plate 11 by a certain distance, thereby creating a space for the folding member 22 of the upper die assembly 20 to move horizontally. It is worth noting that the bending lower die 12 can be driven downward by the upper die assembly, or a driving member can be provided on the lower die assembly to drive the bending lower die 12 to move up and down.

[0045] The blank holder 21 and the folding member 22 of the upper mold assembly 20 are arranged side by side in a horizontal direction (e.g., left-right direction). The blank holder 21 is positioned opposite the lower mold plate 11, and the folding member 22 is positioned opposite the lower bending mold 12. The upper mold assembly can respectively drive the blank holder 21 and the folding member 22 downward to a predetermined position. When the lower bending mold 12 is in the avoidance position, the folding member 22 can also be driven by the upper mold assembly to move horizontally closer to the blank holder 21 and the lower mold plate 11.

[0046] The hemming component 22 has a first station, a second station and a third station. The second station is located below the first station, and the third station is located horizontally on the side of the second station close to the pressing plate 21.

[0047] The folding component 22 is suitable for bending the workpiece 300 placed on the lower mold assembly 10 to form a side fold 310 during the process of moving downward from the first station to the second station; the bending lower mold 12 is suitable for moving downward to an avoidance position after the side fold 310 is bent into place, so as to make way for an avoidance space for the folding component 22 to move from the second station to the third station; the pressing plate 21 is suitable for moving downward to a preset position when the folding component 22 is in the third station to flatten the side fold 310 to form a folding edge 320.

[0048] The following describes the working process of the hem stamping die 100 .

[0049] When the folding stamping die 100 is in the open state, the bending lower die 12 is in the supporting position. At this time, the top surface of the bending lower die 12 is substantially flush with the top surface of the lower template 11. The workpiece 300 to be folded is placed on the top surfaces of the bending lower die 12 and the lower template 11. Figures 6 to 10 As shown in the figure, by adopting segmented forming, the action of the press slide can be split into the following five steps.

[0050] In the first step, the upper mold assembly 20 moves toward the lower mold assembly 10 to the pressing position. At this time, the pressing plate 21 is pressed against the top surface of the workpiece 300 under the action of external force to press the workpiece 300. The side edge of the workpiece 300 extends out of the side of the bending lower mold 12 away from the lower mold plate 11 by a preset width to prepare for the subsequent forming of the side fold 310. In the second step, the folding component 22 moves downward from the first station to the second station under the action of external force. At this time, the folding component 22 can be used as a bending punch. The folding component 22 (also known as the bending punch) moves downward along the side of the pressing plate 21 and the bending lower mold 12 to bend the workpiece 300 extending out of the side edge of the bending lower mold 12 downward by 90 degrees to form the side fold 310. In the third step, after the bending is completed, the bending lower mold 12 moves downward to the avoidance position under the action of external force to make way for the folding component 22 to move horizontally from the second station to the third station. In the fourth step, the folding member 22, driven by the upper mold assembly, moves horizontally from the second station toward the blank holder 21 and lower mold plate 11 to the third station. At this point, the folding member 22 functions as a flattening die, while the blank holder 21 functions as a flattening punch. The side fold 310 of the workpiece 300 is positioned within the concave cavity formed by the folding member 22 and the blank holder 21. In the fifth step, the blank holder 21, driven by the upper mold assembly, continues to press downward, simultaneously completing the flattening action, causing the side fold 310 of the workpiece 300 to bend upward to form a fold 320. This completes the first bending and flattening of the workpiece 300.

[0051] The technical solution of the present invention is to cooperate with the upper die assembly 20 and the lower die assembly 10. When the folding stamping die 100 is in operation, the upper die assembly 20 is first moved from the mold opening state toward the lower die assembly 10 to the pressing position, so that the pressing plate 21 cooperates with the lower die plate 11 and the bending lower die 12 in the supporting position to press the workpiece 300; then, the folding component 22 is moved downward along the side of the pressing plate 21 and the bending lower die 12 to bend the workpiece 300 extending from the side edge of the bending lower die 12 downward by 90 degrees to form a side fold 310; After the bending is completed, the bending lower die 12 moves downward to the avoidance position to make room for the folding part 22 to move horizontally toward the pressing plate 21 and the lower template 11; then, the folding part 22 moves horizontally toward the pressing plate 21 and the lower template 11 under the action of external force, so that the side folding edge 310 of the workpiece 300 is located in the concave cavity enclosed by the folding part 22 and the pressing plate 21; finally, the pressing plate 21 continues to press the material downward, and at the same time completes the flattening action, so that the side folding edge 310 of the workpiece 300 is bent upward to form a folding edge 320. In this way, only one sequence die and one press are needed to complete the stamping and folding process, realize the production of products with folding edges, reduce production costs, and improve production efficiency; and the bending, flattening and folding of the metal plate can be completed by one stamping, which greatly shortens the production time and improves production efficiency compared to the related technology that uses multiple processes to complete the folding. At the same time, since the problem of decreased mold precision caused by multiple stamping is reduced, the flange part of the product will not open in the opposite direction and become unable to fold, and the product quality is also improved.

[0052] In addition, in the related art, the multi-sequence overlapping process usually requires two procedures of flanging and overlapping, or three procedures of flanging, beveling and overlapping to complete, which has low production efficiency, and each process requires a mold, and the mold cost is high. Compared with the multi-sequence overlapping process, this solution can save 1 to 2 sets of molds and 1 to 2 sets of presses, which can greatly reduce the production cost of the product. In addition, the overlapping component 22 can be used as a bending punch and a flattening die to realize the two functions of bending and flattening, and the pressing plate 21 can be used as a pressing plate 21 and a flattening punch to realize the two functions of pressing and flattening. This can further simplify the mold structure, reduce the mold volume, reduce the mold manufacturing cost, and thus further reduce the production cost of the product. In addition, the present technical solution adopts the logic of segmented forming. After the folding part 22 is pushed into place, the folding action is completed by pressing down the pressing plate 21, so that the folding stamping die 100 is not restricted by the shape of the product folding edge. It is not only applicable to linear folding edge structures, but also well applicable to special-shaped folding edge structures. The folding stamping die 100 has a wider applicability.

[0053] like Figures 3 to 5As shown, in one embodiment, the folding component 22 includes a main body 221 and a forming portion 222 provided at the bottom of the main body 221, the forming portion 222 protrudes relative to the main body 221 toward the side close to the pressing plate 21, and the bending lower mold 12 is provided with a contoured cavity 121 adapted to the shape of the forming portion 222, and the forming portion 222 has a first forming surface 2221 and a second forming surface 2222 that are bent, the first forming surface 2221 is used to cooperate with the inner surface of the contoured cavity 121 to form the side folding edge 310 of the workpiece 300, and the second forming surface 2222 is used to cooperate with the bottom surface of the pressing plate 21 to form the folding edge 320 of the workpiece 300.

[0054] In this embodiment, the cross-sections of the main body 221 and the forming portion 222 are substantially the same, and the forming portion 222 protrudes relative to the main body 221 toward the direction of the pressing plate 21, so that the cross-section of the folding part 22 is generally L-shaped. The outer side surface of the forming portion 222 forms a first forming surface 2221, and the top surface of the forming portion 222 forms a second forming surface 2222. The cross-sectional shape of the bending lower die 12 is generally L-shaped, and the bending lower die 12 has a protective cavity adapted to the forming portion 222. When the folding part 22 moves downward to the bending completion position (that is, when the folding part 22 moves to the second station), the forming portion 222 can be accommodated in the imitation cavity. Among them, the main body 221 and the forming portion 222 can be an integrally formed structure or a split structure. Optionally, the main body 221 and the forming portion 222 are integrally formed, which can simplify the manufacturing process of the folding part 22. According to the shape requirements of the product overlap 320, the first molding surface 2221 can be set to a flat surface, a curved surface or a special-shaped surface.

[0055] After the first pressing plate 21 completes the pressing action, the folding component 22 moves downward from the first workstation. At this time, the first forming surface 2221 of the forming part 222 presses the side edge of the workpiece 300 downward until the side edge of the workpiece 300 abuts against the inner surface of the anti-shape cavity of the bending lower mold 12, thereby bending the side edge of the workpiece 300 downward to form a side folding edge 310. After the folding component 22 is pushed into place in the fourth step (that is, when the folding component 22 moves to the third workstation), the second molding surface 2222 of the molding portion 222 is spaced apart below the pressing plate 21, and the side folding edge 310 of the workpiece 300 is located between the pressing plate 21 and the second molding surface 2222, and the side folding edge 310 is abutted against the side surface of the main body 221 close to the pressing plate 21. The pressing plate 21 moves downward to squeeze the side folding edge 310, and under the action of the bottom surface of the pressing plate 21 and the second molding surface 2222, the side folding edge 310 of the workpiece 300 is flattened to form a folding edge 320.

[0056] To better accommodate curved or irregularly shaped overlapped edges 320, the first and second molding surfaces 2221, 2222 may optionally extend in a non-linear manner. The extension direction and length of the first and second molding surfaces 2221, 2222 are generally consistent. For example, the first and second molding surfaces 2221, 2222 may extend in an arc shape, or include straight and arc segments in the extension direction. Taking the first molding surface 2221 as an example, the first molding surface 2221 may extend in a direction in which the middle portion of the first molding surface 2221 is convex toward the side away from the main body, with two flat surfaces on either side. The second molding surface 2222 may extend in a non-linear manner.

[0057] Based on the above embodiments, Figure 4 As shown, in one embodiment, the upper mold component includes an upper mold base 23, an upper mold pad 24, a first elastic member 25 and a second elastic member 26. The upper mold pad 24 is located between the upper mold base 23 and the pressure plate 21. The first elastic member 25 connects the upper mold base 23 and the pressure plate 21. The second elastic member 26 connects the upper mold base 23 and the upper mold pad 24. The first elastic member 25 is used to make the pressure plate 21 float and rise and fall. The second elastic member 26 is used to make the upper mold pad 24 float and rise and fall. The folding component 22 can be slidably arranged on the bottom side of the upper mold pad 24 in the horizontal direction.

[0058] In this embodiment, the first elastic member 25 and the second elastic member 26 include but are not limited to elastic members that can generate elastic force, such as springs or nitrogen cylinders. Optionally, the first elastic member 25 and the second elastic member 26 are nitrogen cylinders. The nitrogen cylinder generally includes a cylinder body for containing nitrogen and a piston rod telescopically arranged in the cylinder body. When an external force acts on the piston rod, the high-pressure nitrogen is compressed and stores energy; when the external force disappears, the high-pressure nitrogen expands and pushes the piston rod outward, thereby generating elastic force. This elastic force can be controlled by adjusting the gas pressure in the nitrogen cylinder. Compared with ordinary springs, nitrogen cylinders have significant advantages such as small size, large elastic force, stable elastic force, long service life, and easy adjustment. When pressing the material, the pressing plate 21 is pressed against the top surface of the workpiece 300 under the action of the first elastic member 25 to press the workpiece 300. The hemming component 22 can be connected to the bottom side of the upper die plate 24 via a resetting elastic mechanism 28 or a driving mechanism, so that the hemming component 22 can reciprocate horizontally relative to the upper die plate 24. The second elastic member 26 acts on the hemming component 22 via the upper die plate 24, so that the hemming component 22 can achieve floating lifting.

[0059] Please refer to Figure 4 and Figure 9In one embodiment, the upper mold part also includes an upper mold insert 27 and a reset elastic mechanism 28. The reset elastic mechanism 28 elastically abuts against the side of the folding part 22 away from the pressure plate 21, so that the folding part 22 can reciprocate in the horizontal direction. The upper mold insert 27 is connected to the upper mold base 23 and extends downward. The upper mold insert 27 is used to drive the folding part 22 to move in the horizontal direction toward the side close to the pressure plate 21 during the downward movement.

[0060] In this embodiment, after the hemming component 22 has completed bending the side hem 310 of the workpiece 300, the upper die pad 24 reaches its maximum downward travel, at which point the bottom surface of the hemming component 22 abuts the lower bending die 12. Subsequently, the lower bending die 12 can continue to move downward under the action of an external force to a clearance position, thereby making room for the hemming component 22 to move horizontally. Next, the upper die holder 23, under the action of an external force, continues to move downward relative to the upper die pad 24, thereby driving the upper die blade 27 downward to a preparatory side-pushing position in preparation for side-pushing the hemming component 22. The upper die holder 23 then drives the upper die blade 27 further downward under the action of an external force. During this downward movement, the upper die blade 27 exerts a horizontal force on the hemming component 22 toward the blank holder 21, causing the hemming component 22 to move from the second station toward the side of the blank holder 21 to the third station. During this process, the resetting elastic mechanism 28 is stretched to store elastic potential energy. When the force exerted by the upper die blade 27 on the hemming member 22 by its upward movement is removed, the return spring mechanism 28 can drive the hemming member 22 to return to its original position. In this way, the hemming member 22 can achieve horizontal reciprocating motion simply through the mechanical coordination of the upper die blade 27, the return spring mechanism 28, and the hemming member 22.

[0061] Optionally, the upper die pad 24 is provided with a first positioning column 242 extending downward, and the lower die assembly 10 is provided with a second positioning column 132 extending upward, and the first positioning column 242 is used to abut and cooperate with the second positioning column 132 to limit the downward movement of the upper die pad 24. For example, when the upper die assembly 20 moves to the pressing position relative to the lower die assembly 10, there is a certain gap between the first positioning column 242 and the second positioning column 132. When the upper die assembly 20 continues to move downward to the bending completion position, the first positioning column 242 and the second positioning column 132 abut against each other. Thereafter, when the upper die assembly 20 is subjected to downward pressure, the upper die pad 24 remains fixed, and the upper die base 23 can drive the upper die insert 27, the hitting rod 233 and other components to continue to move downward.

[0062] In order to better drive the stacking part 22 to move in the horizontal direction and avoid the upper die inserting knife 27 from interfering with the stacking part 22, as shown in FIG. Figure 5 and Figure 9As shown, in one embodiment, a driving bevel 271 is provided at the lower end of the upper die insert 27, near the side of the hemming component 22. The driving bevel 271 is inclined downwardly toward the side away from the hemming component 22. The hemming component 22 is provided with a mating bevel 2211 for abutting and mating with the driving bevel 271. During the downward movement of the upper die insert 27, the driving bevel 271 of the upper die insert 27 abuts the mating bevel 2211 of the hemming component 22. The driving bevel 271 generates a horizontal force on the hemming component 22, thereby driving the hemming component 22 to move horizontally.

[0063] In order to make the downward movement of the upper die holder 23 more stable and reliable, Figure 4 As shown, in one embodiment, the upper die base 23 is provided with a downwardly extending guide post 231, and the upper die pad 24 is provided with a guide hole for the guide post 231 to pass through. The upper die pad 24 and the guide post 231 are slidably engaged, thereby guiding the downward movement of the upper die base 23. Optionally, multiple guide posts 231 and guide holes are provided, and the guide posts 231 and guide holes are interspersed and slidably engaged one-to-one. For example, the upper die base 23 and the upper die pad 24 are substantially identical square plates. The upper die pad 24 is located below the upper die base 23. The four corners of the upper die base 23 are provided with downwardly extending guide posts 231, and the four corners of the upper die pad 24 are provided with guide holes for each guide post 231 to pass through. This further improves the reliability of the upper die base 23's lifting and lowering movement, thereby ensuring the stability and precision of the movement of components such as the upper die insert 27 and the driving rod 233 fixed to the upper die base 23.

[0064] In order to make the horizontal movement of the folding component 22 more stable and reliable, Figure 4 As shown, the bottom side of the upper mold pad 24 is provided with two guide portions 241 arranged opposite and spaced apart. The folding component 22 is located between the two guide portions 241. The guide portion 241 and the folding component 22 slide in cooperation. In this way, the horizontal movement of the folding component 22 can be guided to prevent the folding component 22 from deflecting during the horizontal movement. Optionally, the guide portion 241 includes a main body extending downward from the bottom side of the upper mold pad 24, and a protrusion provided at the bottom of the main body and protruding toward the other guide portion 241, so that the guide portion 241 is generally L-shaped. The main body, the protrusion, and the upper mold pad 24 together form a guide groove. A protrusion is provided on each side of the folding component 22, and the protrusion is slidably disposed in the guide groove. In this way, the sliding cooperation between the folding component 22 and the guide portion 241 is more stable and reliable.

[0065] In order to better apply pressure to the pressing plate 21, as Figure 4As shown, in one embodiment, the upper die base 23 is provided with a folding force transmission rod 232 extending downward, and the folding force transmission rod 232 passes through the upper die pad 24 and is connected to the press plate 21. During the flattening folding 320 process, the press plate 21 can continue to move downward under the action of the folding force transmission rod 232 to flatten the folding 320 of the product. In order to make the force applied to the press plate 21 more uniform, optionally, a plurality of folding force transmission rods 232 are provided, and the plurality of folding force transmission rods 232 are arranged at intervals, so that the press plate 21 can be subjected to force at multiple points, and the overall force is more uniform.

[0066] like Figure 2 and Figure 3 As shown, in one embodiment, the lower mold assembly 10 also includes a lower mold base 13, a third elastic member 14 and a fourth elastic member 15, the third elastic member 14 connects the lower mold base 13 and the lower template 11, the fourth elastic member 15 connects the lower mold base 13 and the bending lower mold 12, the third elastic member 14 is used to make the lower template 11 float and rise and fall, the fourth elastic member 15 is used to make the bending lower mold 12 float and rise and fall, the upper mold base 23 is provided with a downward extending rod 233, the hitting rod 233 is used to drive the bending lower mold 12 to move downward to the avoidance position during the downward movement.

[0067] In this embodiment, the third elastic member 14 and the fourth elastic member 15 include but are not limited to elastic members that can generate elastic force such as springs or nitrogen cylinders. Optionally, the third elastic member 14 and the fourth elastic member 15 adopt nitrogen cylinders. When pressing and bending, the third elastic member 14 and the fourth elastic member 15 provide elastic supporting force to the lower template 11 and the bending lower die 12 respectively. During the bending process, the elastic supporting force provided by the fourth elastic member 15 to the bending lower die 12 is greater than the bending forming force of the product. After the bending is completed, the upper die seat 23 continues to descend, driving the hitting rod 233 to press the bending lower die 12 downward, so that the bending lower die 12 can move downward to the avoidance position under the drive of the hitting rod 233 to make way for the horizontal movement of the folding part 22. In this way, the bending lower mold 12 can be driven to perform floating lifting and adjustment only through the mechanical cooperation of the hitting rod 233 and the fourth elastic member 15, without setting up other complex power mechanisms to drive the bending lower mold 12 to lift and lower, which can simplify the mold structure and reduce costs.

[0068] like Figure 3As shown, in one embodiment, a support column 131 is provided on the top of the lower die base 13, and the support column 131 is used to support the folding part 22 during the process of flattening the folding 320. During the process of flattening the folding 320, the side folding edge 310 is pressed downward by the pressure plate 21, so that the side folding edge 310 is gradually bent upward from 90°, and finally clamped between the pressure plate 21 and the folding part 22 to form the folding 320. The folding part 22 is supported by the support column 131 to ensure that the folding part 22 remains in a fixed position during the entire process of flattening the folding 320, so that the flattening of the folding 320 can be completed accurately. Optionally, a plurality of support columns 131 are provided, and the plurality of support columns 131 are arranged at intervals along the length direction of the folding part 22, so that the folding part 22 can be supported more stably.

[0069] like Figure 2 and Figure 4 As shown, in one embodiment, the upper die assembly 20 further includes a clamping plate 29 provided between the upper die pad 24 and the pressure plate 21, and the lower die assembly 10 further includes a lower die pad 16 provided between the lower die base 13 and the lower die plate 11, and the clamping plate 29 and the lower die pad 16 are respectively provided with a stamping punch 291, and the pressure plate 21 and the lower die plate 11 are respectively provided with a stamping hole 211 for the stamping punch 291 to pass through. In this way, during the mold closing process, the workpiece 300 can also be stamped and formed by the cooperation of the stamping punch 291 and the stamping hole 211, so as to punch out a through hole or a convex bulge on the workpiece 300. In this way, the folding stamping die 100 has both the folding and punching functions.

[0070] The following combination Figures 6 to 10 The bending and flattening process of the folding stamping die 100 provided in one embodiment is introduced.

[0071] like Figure 6 As shown, in the first step, the upper mold assembly 20 moves from the mold opening position to the material pressing position, and the workpiece 300 placed on the top surface of the lower mold plate 11 and the bending lower mold 12 is pressed by the material pressing plate 21;

[0072] like Figure 7 As shown, in the second step, the upper mold assembly 20 continues to descend from the pressing position to the bending completion position. During this process, the folding part 22 is used as a bending punch, moving downward from the first station to the second station, and the side edge of the workpiece 300 is squeezed through the first forming surface 2221 of the folding part 22, so that the side edge of the workpiece 300 is bent downward 90 degrees to form a side fold 310.

[0073] like Figure 8As shown, in the third step, the upper die assembly 20 continues to descend from the bending completion position to the side-pushing position, and the bending lower die 12 is pushed downward by the hitting rod 233, so that the bending lower die 12 moves downward to the avoidance position, so as to make room for the folding part 22 to move horizontally toward the pressure plate 21, and at the same time, the upper die insert 27 moves to a position suitable for side-pushing the folding part 22.

[0074] like Figure 9 As shown, in the fourth step, the upper mold assembly 20 continues to descend from the side-pushing preparation position to the side-pushing position. During this process, the upper mold inserter 27 descends and squeezes the folding part 22, so that the folding part 22 moves from the second station toward the side of the pressure plate 21 and the lower mold plate 11 to the third station until the side of the folding part 22 abuts against the side of the pressure plate 21.

[0075] like Figure 10 As shown, in the fifth step, the upper mold assembly 20 continues to descend from the side push position to the flattening position. During this process, the pressure plate 21 can be used as a flattening punch, and the folding part 22 can be used as a flattening die. The bottom surface of the pressure plate 21 cooperates with the second forming surface 2222 of the folding part 22 to bend the side folding edge 310 of the workpiece 300 upward and flatten it to form a folding edge 320.

[0076] The above five steps can achieve a single-step bending and flattening of the workpiece 300. Only one die and one press are required to complete the bending and flattening action, thereby enabling the production of products with overlapping edges. Furthermore, after the overlapping edge component 22 is pushed into place, the pressing plate 21 is pressed downward to complete the flattening action. This allows the overlapping edge stamping die 100 to be unrestricted by the shape of the product's overlapping edge 320 and is suitable not only for linear overlapping edge structures but also for special-shaped overlapping edge structures, thus making the overlapping edge stamping die 100 more widely applicable.

[0077] The present invention also proposes a device for producing overlapped edge products, which includes a press and an overlapped edge stamping die 100. The specific structure of the overlapped edge stamping die 100 refers to the above-mentioned embodiment. Since the present device for producing overlapped edge products adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0078] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by utilizing the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A stacking stamping die, characterized in that: include: A lower die assembly, comprising a lower die plate and a bending lower die, wherein the bending lower die can move up and down relative to the lower die plate; as well as An upper mold assembly is movably arranged above the lower mold assembly, and the upper mold assembly includes an upper mold part, and a pressure plate and a stacking part arranged at the lower part of the upper mold part, the pressure plate is arranged opposite to the lower mold plate, and the stacking part is arranged opposite to the bending lower mold, and the stacking part can move horizontally relative to the upper mold part to approach or move away from the pressure plate; the upper mold part is suitable for driving the pressure plate and the stacking part to move downward, and driving the stacking part to move horizontally; The stacking component comprises a first station, a second station and a third station, wherein the second station is arranged below the first station, and the third station is arranged horizontally on a side of the second station close to the pressing plate; The folding component is adapted to bend the workpiece placed on the lower die assembly to form a side fold during the process of moving downward from the first station to the second station; the bending lower die is adapted to move downward to an avoidance position after the side fold is bent into place, so as to make way for the folding component to move from the second station to the third station; the pressing plate is adapted to move downward to a preset position when the folding component is in the third station, so as to flatten the side fold to form a fold; The folding component includes a main body and a forming portion provided at the bottom of the main body, the forming portion protrudes relative to the main body toward a side close to the pressing plate, the bending lower die is provided with a contoured cavity adapted to the shape of the forming portion, the forming portion has a first forming surface and a second forming surface that are bent, the first forming surface is used to cooperate with the inner side surface of the contoured cavity to form the side folding edge of the workpiece, and the second forming surface is used to cooperate with the bottom surface of the pressing plate to form the folding edge of the workpiece; the first forming surface and the second forming surface are arranged to extend non-linearly; The upper mold part includes an upper mold pad, the lower mold assembly also includes a lower mold base, the upper mold part also includes a clamping plate arranged between the upper mold pad and the pressure plate, the lower mold assembly also includes a lower mold pad arranged between the lower mold base and the lower mold plate, the clamping plate and the lower mold pad are respectively provided with stamping punches, and the pressure plate and the lower mold plate are respectively provided with stamping holes for the stamping punches to pass through.

2. The hem stamping die according to claim 1, wherein: The upper mold component includes an upper mold base, a first elastic member and a second elastic member. The upper mold pad is located between the upper mold base and the pressure plate. The first elastic member connects the upper mold base and the pressure plate. The second elastic member connects the upper mold base and the upper mold pad. The first elastic member is used to make the pressure plate float and rise and fall. The second elastic member is used to make the upper mold pad float and rise and fall. The folding component can be slidably arranged on the bottom side of the upper mold pad in the horizontal direction.

3. The hem stamping die according to claim 2, wherein: The upper mold component also includes an upper mold insert and a reset elastic mechanism. The reset elastic mechanism elastically abuts against the side of the folding component away from the pressure plate so that the folding component can reciprocate in the horizontal direction. The upper mold insert is connected to the upper mold base and extends downward. The upper mold insert is used to drive the folding component to move in the horizontal direction toward the side close to the pressure plate during the downward movement.

4. The hem stamping die according to claim 3, wherein: A driving slope is provided on the side of the lower end of the upper die insert close to the folding component. The driving slope is inclined from top to bottom toward the side away from the folding component. The folding component is provided with a matching slope for abutting and matching with the driving slope.

5. The hem stamping die according to claim 2, wherein: The upper die base is provided with a guide column extending downward, the upper die pad is provided with a guide hole for the guide column to pass through, and the upper die pad is slidably matched with the guide column; And / or, two guide parts that are opposite to each other and spaced apart are provided on the bottom side of the upper mold pad, the folding part is located between the two guide parts, and the guide part is slidably engaged with the folding part.

6. The hem stamping die according to claim 2, wherein: The upper die seat is provided with a folding force transmission rod extending downward, and the folding force transmission rod passes through the upper die pad and is connected to the pressing plate.

7. The hem stamping die according to claim 2, wherein: The lower mold assembly also includes a third elastic member and a fourth elastic member. The third elastic member connects the lower mold base and the lower mold plate, and the fourth elastic member connects the lower mold base and the bending lower mold. The third elastic member is used to make the lower mold plate float and rise and fall, and the fourth elastic member is used to make the bending lower mold float and rise and fall. The upper mold base is provided with a downward extending hitting rod, and the hitting rod is used to drive the bending lower mold to move downward to the avoidance position during the downward movement.

8. The hem stamping die according to claim 7, wherein: A support column is provided on the top of the lower die base, and the support column is used to support the folding component during the process of flattening the folding edge.

9. A device for producing overlapped products, characterized in that: The invention comprises the hem-stitching stamping die according to any one of claims 1 to 8.

Images