CN221158308U - Negative angle bending mechanism and stamping die with same - Google Patents
Negative angle bending mechanism and stamping die with same Download PDFInfo
- Publication number
- CN221158308U CN221158308U CN202322756763.6U CN202322756763U CN221158308U CN 221158308 U CN221158308 U CN 221158308U CN 202322756763 U CN202322756763 U CN 202322756763U CN 221158308 U CN221158308 U CN 221158308U
- Authority
- CN
- China
- Prior art keywords
- punch
- die assembly
- lower die
- negative angle
- bending mechanism
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005452 bending Methods 0.000 title claims abstract description 65
- 230000007246 mechanism Effects 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 230000013011 mating Effects 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 claims description 4
- 238000013459 approach Methods 0.000 claims description 2
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000013461 design Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The utility model discloses a negative angle bending mechanism and a stamping die with the same, wherein the negative angle bending mechanism comprises an upper die assembly and a lower die assembly, the upper die assembly is provided with a swinging punch, the lower die assembly is provided with a bending insert, the negative angle bending mechanism is also provided with a guide piece which drives the swinging punch to swing when the upper die assembly and the lower die assembly are assembled, and the negative angle bending mechanism can realize one-step bending forming of a negative angle of a plate through the cooperation of the swinging punch and the bending insert in the stamping forming application scene of the plate through the stamping die based on the specific structure of the negative angle bending mechanism provided by the utility model.
Description
Technical Field
The utility model relates to the technical field of die development, in particular to a negative angle bending mechanism and a stamping die with the negative angle bending mechanism.
Background
With the continuous improvement of mechanical processing technology and technological level, the technology is developed in various industries such as connectors, automobiles, medical treatment, hardware products and the like in increasingly refined and efficient production modes, and higher requirements are put on the aspects of product precision, product appearance quality, production efficiency, product performance and the like. The negative angle stamping forming process becomes one of hot topics in various industries.
Negative angle stamping is a common process in stamping products, and in the prior art, the negative angle stamping process usually has multiple steps, namely, the negative angle is obtained by folding by 90 degrees and pushing the negative angle, namely, the required negative angle of the product is obtained through a two-step forming process. However, compared with the one-step molding process, the two-step molding process requires more production equipment, manpower and the like, so that the production efficiency is low, the production period of the product is prolonged, the number of equipment and dies is increased, the consumption of other auxiliary materials is increased, the manufacturing cost and the manpower cost are increased, and the production cost is very high.
In view of the foregoing, there is a need for an improved solution to the above-mentioned problems.
Disclosure of utility model
The utility model aims to at least solve one of the technical problems in the prior art, and provides a negative angle bending mechanism which is specifically designed as follows.
A negative angle bending mechanism comprises an upper die assembly and a lower die assembly; the upper die assembly comprises an upper clamping plate, a stripper plate and a swing punch, wherein the swing punch is arranged in a swinging manner relative to the upper clamping plate by taking the edge of one side of the top of the swing punch as a swing supporting shaft, and the stripper plate is vertically movably arranged on the lower side of the upper clamping plate and is provided with an upper die hole for the lower end of the swing punch to extend or retract; the lower die assembly comprises a lower die plate provided with a lower die hole, a bending insert is arranged in the lower die hole, a forming inclined plane is arranged on the bending insert, and the forming inclined plane corresponds to one side of the swing punch away from the side of the swing support shaft so as to be matched with the swing punch which is inclined after swinging when the upper die assembly and the lower die assembly are assembled; the negative angle bending mechanism is also provided with a guide piece which drives the swing punch to swing when the upper die assembly and the lower die assembly are assembled.
Further, the guide piece is a lower die stop block arranged in the lower die hole, the lower die stop block is opposite to the bending insert and is provided with a guide inclined surface, and the guide inclined surface is arranged on one side of the lower die stop block, which faces the bending insert, so that the lower end of the swing punch is driven to approach one side of the bending insert when the upper die assembly and the lower die assembly are assembled.
Further, the included angle between the guide inclined plane and the vertical direction is 20-30 degrees.
Further, the lower end of the swinging punch is provided with a matching inclined plane matched with the lower die stop block, and the matching inclined plane is attached to the guide inclined plane when the upper die assembly and the lower die assembly are assembled to be in a compaction state.
Further, a yielding area is arranged on one side of the swing punch, which is away from the side of the swing support shaft, and the yielding area is formed by inwards sinking the corresponding side wall of the swing punch and is used for providing a yielding space for the swing of the swing punch when the upper die assembly and the lower die assembly are assembled.
Further, a reset portion is formed on a side of the swing punch away from a side of the swing support shaft, and the reset portion is used for being matched with the side wall of the upper die hole when the upper die assembly and the lower die assembly are separated so as to enable the swing punch to be restored to a pre-die-assembly state.
Further, after the upper die assembly is separated from the lower die assembly, in a direction from the side where the swing support shaft is located to the other opposite side of the swing punch, a plane where the top surface of the swing punch is located is inclined downwards relative to a plane where the upper surface of the upper clamping plate is located, and the inclination angle is not smaller than the swing angle of the swing punch in the die assembly process.
Further, a hook is further arranged at the position of the swing supporting shaft of the swing punch, a containing groove for containing the hook is formed on the upper clamping plate, the hook is provided with a hanging surface facing to the lower side, and the containing groove is provided with a bearing surface facing to the upper side and opposite to the hanging surface; after the upper die assembly and the lower die assembly are separated, the side where the swing supporting shaft is located points to the direction of the other opposite side of the swing punch, the plane where the hanging surface is located is inclined downwards relative to the plane where the bearing surface is located, and the inclination angle is not smaller than the swing angle of the swing punch in the die assembly process.
Further, the top of the oscillating punch is formed with a chamfer on a side facing away from the side on which the oscillating support shaft is located.
The utility model also provides a stamping die which comprises an upper die holder, a lower die holder and the negative angle bending mechanism, wherein the upper die holder is arranged above the lower die holder, the upper die assembly in the negative angle bending mechanism is arranged on the upper die holder, and the lower die assembly in the negative angle bending mechanism is arranged on the lower die holder.
The beneficial effects of the utility model are as follows: based on the negative angle bending mechanism provided by the utility model, in the application scene of realizing the stamping forming of the plate by the stamping die, the one-step bending forming of the plate at a negative angle can be realized by the cooperation of the swinging punch and the bending insert, so that compared with the prior art, the production efficiency is obviously improved, the investment of equipment and the die is reduced, the manufacturing cost and the labor cost are saved, the economic benefit can be effectively improved, and the negative angle bending mechanism has wide application prospect in various industries such as connectors, automobiles, medical treatment, hardware products and the like.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective view of a negative angle bending mechanism after a vertical plane is cut away before a negative angle is formed;
FIG. 2 is a schematic plan view of the structure of FIG. 1 at a cross-sectional location;
FIG. 3 is a schematic perspective view of a negative angle bending mechanism after a vertical plane is cut away during negative angle forming of a sheet material;
FIG. 4 is a schematic plan view of the structure of FIG. 3 in cross-section;
FIG. 5 is a schematic perspective view of a negative angle bending mechanism after forming a negative angle and having a vertical plane cut away;
fig. 6 shows a schematic plan view of the structure of fig. 5 at a cross-sectional location.
In the figure, 11 is an upper clamping plate, 12 is a stripper plate, 13 is a swinging punch, L is a swinging supporting shaft, 130 is a hook, 131 is a yielding zone, 132 is a resetting part, 133 is a chamfer, 134 is a matching inclined plane, 14 is a stripper plate, 21 is a lower template, 22 is a bending insert, 220 is a forming inclined plane, 230 is a guiding inclined plane, 23 is a lower die stop block, and 300 is a plate.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1 and 2, the negative angle bending mechanism provided by the utility model comprises an upper die assembly and a lower die assembly; the upper die assembly comprises an upper clamping plate 11, a stripper plate 12 and a swinging punch 13, wherein the swinging punch 13 swings relative to the upper clamping plate 11 by taking the edge of one side of the top of the swinging punch 13 as a swinging supporting shaft L, the stripper plate 12 is movably arranged on the lower side of the upper clamping plate 11 up and down and is provided with an upper die hole (not marked in the figure) for the lower end of the swinging punch 13 to extend or retract.
In other embodiments of the present utility model, the stripper plate 12 may also have a stripper plate 14 fixed to the upper surface thereof, wherein the upper mold holes penetrate the stripper plate 14 and the stripper plate 12. The upper surface of the upper clamping plate 11 may be further fixed with a pad, and at this time, the top side edge of the swinging punch 13 is supported on the lower surface of the pad to constitute a swinging support shaft L.
The lower die assembly of the negative angle bending mechanism comprises a lower die plate 21 provided with a lower die hole, wherein a bending insert 22 is arranged in the lower die hole, the bending insert 22 is provided with a forming inclined plane 220, and the forming inclined plane 220 is arranged corresponding to one side of the swinging punch 13, which is away from the side of the swinging support shaft L, so as to be matched with the swinging punch 13 which is inclined after swinging when the upper die assembly and the lower die assembly are assembled. As shown in fig. 3 and 4, when the upper die assembly and the lower die assembly are clamped, the plate 300 can be bent at a negative angle based on the cooperation of the swinging punch 13 and the forming inclined surface 220 after swinging.
In order to enable the swinging punch 13 to swing when the upper die assembly and the lower die assembly are clamped, the negative angle bending mechanism according to the utility model further comprises a guide member for driving the swinging punch 13 to swing when the upper die assembly and the lower die assembly are clamped.
In addition, the utility model also provides a stamping die, which comprises an upper die holder (not shown in the figure), a lower die holder (not shown in the figure) and the negative angle bending mechanism, wherein the upper die holder is arranged above the lower die holder, the upper die assembly in the negative angle bending mechanism is arranged on the upper die holder, and the lower die assembly in the negative angle bending mechanism is arranged on the lower die holder.
Based on the negative angle bending mechanism provided by the utility model, in the stamping forming application scene of the plate 300 realized by the stamping die, the one-step bending forming of the plate 300 at the negative angle can be realized by the cooperation of the swinging punch 13 and the bending insert 22, so that the production efficiency is obviously improved compared with the prior art, the investment of equipment and dies is reduced, the manufacturing cost and the labor cost are saved, the economic benefit can be effectively improved, and the negative angle bending mechanism has wide application prospect in various industries such as connectors, automobiles, medical treatment, hardware products and the like.
In some embodiments of the present utility model, referring to fig. 1 and 2, the guide member is a lower die block 23 disposed in the lower die hole, wherein the lower die block 23 is disposed opposite to the bending insert 22 and has a guide inclined surface 230, and the guide inclined surface 230 is disposed at a side of the lower die block 23 facing the bending insert 22. As shown in fig. 3 and 4, the guide inclined surface 230 urges the lower end of the oscillating punch 13 toward the side of the bending insert 22 when the upper die assembly and the lower die assembly are clamped.
As some preferred embodiments of the present utility model, the angle between the guide ramp 230 and the vertical is in the range of 20-30.
In some preferred embodiments, as shown in fig. 2 and 4, the lower end of the oscillating punch 13 has a mating inclined surface 134 that mates with the lower die block 23, and the mating inclined surface 134 mates with the guide inclined surface 230 when the upper and lower die assemblies are clamped to a solid state. The compacted state is a state in which the upper die assembly and the lower die assembly are clamped and the plate 300 is formed at a predetermined negative angle, as will be understood more readily.
In the present utility model, as shown in fig. 2 and 4, a relief area 131 is provided on a side of the swing punch 13 away from the side of the swing support shaft L, where the relief area 131 is formed by recessing inward from a corresponding sidewall of the swing punch 13, so as to provide a relief space for the swing punch 13 to swing when the upper die assembly and the lower die assembly are assembled. It is easy to understand that when the upper die assembly and the lower die assembly are assembled, the swinging punch 13 swings to be close to one side wall of the upper die hole, and the design of the relief area 131 can prevent the side wall of the upper die hole from blocking the swinging of the swinging punch 13.
Further preferably, as shown in fig. 4, 5 and 6, a reset portion 132 is formed on a side of the oscillating punch 13 away from the oscillating support shaft L, and the reset portion 132 is adapted to cooperate with the upper die hole side wall to restore the oscillating punch 13 to the pre-mold state when the upper die assembly and the lower die assembly are separated. As shown in the drawing, in this embodiment, the reset portion 132 is located at a side lower end position of the oscillating punch 13 on a side away from the oscillating support shaft L, and the reset portion 132 cooperates with the upper die hole side wall to oscillate the oscillating punch 13 reversely when the upper die assembly and the lower die assembly are separated.
In still other embodiments of the present utility model, as shown in fig. 2 and 6, after the upper die assembly is separated from the lower die assembly, the plane of the top surface of the oscillating punch 13 is inclined downward with respect to the plane of the upper surface of the upper clamping plate 11 in a direction from the side of the oscillating support shaft L toward the other opposite side of the oscillating punch 13, and the inclination angle α is not smaller than the oscillation angle of the oscillating punch 13 during die assembly. This design avoids interference between the oscillating punch 13 and the upper support (e.g., the backing plate) of the upper clamp plate 11 during clamping, and in some more specific embodiments, the angle of inclination α is in the range of 1 ° -2 ° from the angle of oscillation of the oscillating punch 13 during clamping.
Referring to fig. 1 to 6, the swinging punch 13 in this embodiment is further provided with a hook 130 at the position of the swinging support shaft L, the upper clamping plate 11 is formed with a receiving groove (not shown) for receiving the hook 130, the hook 130 has a hanging surface (not shown) facing downward, and the receiving groove has a bearing surface (not shown) facing upward opposite to the hanging surface; after the upper die assembly and the lower die assembly are separated, the plane of the hanging surface is inclined downwards relative to the plane of the bearing surface in the direction from the side of the swinging support shaft L to the other opposite side of the swinging punch 13, and the inclination angle beta is not smaller than the swinging angle of the swinging punch in the die assembly process. This design avoids interference between the abutment surface of the hook 130 and the bearing surface of the receiving groove during clamping, and in some more specific embodiments, the angle of inclination β is in the range of 1 ° -2 ° from the angle of oscillation of the oscillating punch 13 during clamping.
Referring to fig. 1, 2, 4, and 6, as a preferred embodiment of the present utility model, the top of the oscillating punch 13 is formed with a chamfer 133 on a side facing away from the oscillating support shaft L. The design can avoid interference between the position of the swinging punch 13 and the upper clamping plate 11 in the die assembly process.
For a better understanding of the present utility model, the negative angle stamping process of sheet 300 is briefly described below in connection with fig. 1-6:
Firstly, the plate 300 is put into a proper position of a stamping die, as shown in fig. 1 and 2; then the upper membrane module is pressed down, and the plate 300 is clamped between the stripper plate 12 and the lower template 21; continuing the pressing action to enable the swinging punch 13 to protrude out of the stripper plate 12 and then contact the plate 300; the plate 300 starts to bend under the action of the swinging punch 13; when the mating inclined surface 134 of the swinging punch 13 contacts with the guiding inclined surface 230 of the lower die stop block 23, the swinging punch 13 swings along the guiding inclined surface 230 towards the bending insert 22 side with the swinging support shaft L as the center and presses the plate 300 until the plate 300 is in a compaction state, so that the plate 300 is bent into a plate product with a negative angle (< 90 degrees), as shown in fig. 3 and 4; finally, the upper film assembly moves upwards, the swinging punch 13 returns to the original position under the action of the reset part 132, as shown in fig. 5 and 6, and the formed plate product can be taken out.
It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present utility model, and they are not intended to limit the scope of the present utility model, and all equivalent embodiments or modifications that do not depart from the spirit of the present utility model should be included in the scope of the present utility model.
Claims (10)
1. A negative angle bending mechanism comprises an upper die assembly and a lower die assembly; the upper die assembly is characterized by comprising an upper clamping plate, a stripper plate and a swinging punch, wherein the swinging punch is arranged in a swinging way relative to the upper clamping plate by taking the edge of one side of the top of the swinging punch as a swinging supporting shaft, and the stripper plate is vertically movably arranged on the lower side of the upper clamping plate and is provided with an upper die hole for extending or retracting the lower end of the swinging punch; the lower die assembly comprises a lower die plate provided with a lower die hole, a bending insert is arranged in the lower die hole, a forming inclined plane is arranged on the bending insert, and the forming inclined plane corresponds to one side of the swing punch away from the side of the swing support shaft so as to be matched with the swing punch which is inclined after swinging when the upper die assembly and the lower die assembly are assembled; the negative angle bending mechanism is also provided with a guide piece which drives the swing punch to swing when the upper die assembly and the lower die assembly are assembled.
2. The negative angle bending mechanism of claim 1, wherein the guide member is a lower die stop disposed in the lower die hole, the lower die stop is disposed opposite to the bending insert and has a guide inclined surface, and the guide inclined surface is disposed on a side of the lower die stop facing the bending insert so as to drive the lower end of the swinging punch to approach the bending insert when the upper die assembly and the lower die assembly are clamped.
3. The negative angle bending mechanism of claim 2, wherein the guide ramp has an angle in the range of 20 ° to 30 ° from vertical.
4. The negative angle bending mechanism of claim 2, wherein the oscillating punch lower end has a mating ramp engaging the lower die stop, the mating ramp engaging the guide ramp when the upper and lower die assemblies are clamped to a compact condition.
5. The negative angle bending mechanism according to any one of claims 1 to 4, wherein a relief area is provided on a side of the oscillating punch facing away from the side of the oscillating support shaft, the relief area being formed by recessing inwardly from a corresponding side wall of the oscillating punch for providing a relief space for the oscillating punch to oscillate when the upper die assembly and the lower die assembly are clamped.
6. The negative angle bending mechanism according to any one of claims 1 to 4, wherein a reset portion is formed on a side of the oscillating punch away from a side on which the oscillating support shaft is located, the reset portion being adapted to cooperate with the upper die hole side wall to restore the oscillating punch to a pre-mold-clamping state when the upper die assembly and the lower die assembly are separated.
7. The negative angle bending mechanism according to any one of claims 1 to 4, wherein after the upper die assembly is separated from the lower die assembly, a plane in which a top surface of the oscillating punch is located is inclined downward with respect to a plane in which an upper surface of the upper clamping plate is located in a direction from a side in which the oscillating support shaft is located toward the other opposite side of the oscillating punch, and an inclination angle is not smaller than an oscillation angle of the oscillating punch during die assembly.
8. The negative angle bending mechanism according to any one of claims 1 to 4, wherein the swinging punch is further provided with a hook at a position where the swinging support shaft is located, the upper clamping plate is formed with a receiving groove for receiving the hook, the hook has a hanging surface facing downward, and the receiving groove has a bearing surface facing upward opposite to the hanging surface; after the upper die assembly and the lower die assembly are separated, the side where the swing supporting shaft is located points to the direction of the other opposite side of the swing punch, the plane where the hanging surface is located is inclined downwards relative to the plane where the bearing surface is located, and the inclination angle is not smaller than the swing angle of the swing punch in the die assembly process.
9. The negative angle bending mechanism according to any one of claims 1 to 4, wherein the top of the oscillating punch is formed with a chamfer on a side facing away from the side on which the oscillating support shaft is located.
10. A stamping die, comprising an upper die holder, a lower die holder and the negative angle bending mechanism according to any one of claims 1-9, wherein the upper die holder is arranged above the lower die holder, the upper die assembly in the negative angle bending mechanism is arranged on the upper die holder, and the lower die assembly in the negative angle bending mechanism is arranged on the lower die holder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322756763.6U CN221158308U (en) | 2023-10-13 | 2023-10-13 | Negative angle bending mechanism and stamping die with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322756763.6U CN221158308U (en) | 2023-10-13 | 2023-10-13 | Negative angle bending mechanism and stamping die with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221158308U true CN221158308U (en) | 2024-06-18 |
Family
ID=91531912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322756763.6U Active CN221158308U (en) | 2023-10-13 | 2023-10-13 | Negative angle bending mechanism and stamping die with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221158308U (en) |
-
2023
- 2023-10-13 CN CN202322756763.6U patent/CN221158308U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN212442847U (en) | Plate flanging stamping die | |
| CN110090878A (en) | The double right-angle bending devices of plate U-shaped | |
| CN215614427U (en) | Punching and flanging die for automobile framework | |
| CN221158308U (en) | Negative angle bending mechanism and stamping die with same | |
| CN211539189U (en) | Upper die assembly and continuous forming die comprising same | |
| CN217492368U (en) | Upturning, bending and punching synchronous double-acting mechanism | |
| CN210208188U (en) | Stainless steel spring piece bending angle adjusting die | |
| CN217665846U (en) | Stamping die of formula of sinking circular arc spare | |
| CN2880307Y (en) | Demoulding structure of punch press mould | |
| CN218049925U (en) | Bending die capable of preventing waste materials from being generated | |
| CN211101053U (en) | Forming die with double-cavity structure | |
| CN211191658U (en) | Engineering mould with complex forming structure | |
| CN217412147U (en) | Material stripping structure for stamping guide shoe mounting plate of elevator | |
| CN215786186U (en) | High-efficient cut-out press that cuts | |
| CN220717577U (en) | Novel material structure is taken off to swage | |
| CN212884499U (en) | Progressive die for bending complex parts | |
| CN217492369U (en) | Continuous material belt product connecting edge bending and trimming synchronous forming mechanism and continuous die | |
| CN214184894U (en) | Continuous bending die for long and narrow products | |
| CN220295657U (en) | Bending mechanism with protection structure on continuous stamping die | |
| CN212598322U (en) | Forming device, continuous stamping die and sheet metal part | |
| CN213915685U (en) | Punch and stamping die | |
| CN218638266U (en) | Forming die | |
| CN217617241U (en) | Stamping die of acute angle workpiece | |
| CN221414704U (en) | Die punch state switching mechanism | |
| CN215508599U (en) | Novel bending die |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |