A continuous stamping method of a lock catch plate

Abstract

The present application relates to a kind of continuous punching method of lock catch plate, steps include: punch positioning hole, once edge cutting, hit convex, twice edge cutting, punch, third edge cutting, step bending and blanking.The present application is by being arranged in the position close to the first side edge of material strip by long side edge and being arranged in the side of relative long side edge of wing part by connecting material, the forming of convex does not affect the relative position of product area relative to connecting excess material, and long side edge is obtained by cutting processing margin, avoid the problem of subsequent bending position inaccuracy, ensure the overall structure precision of lock catch plate.

Description

Technical Field

[0001] This invention relates to the field of stamping technology, and in particular to a continuous stamping method for a latching plate. Background Technology

[0002] Figure 1 This is a latching plate 1, a metal stamping part with a generally U-shaped multi-bend structure. It includes a main flat portion 11, a first folded portion 12, and a second folded portion 13 integrally connected in sequence. The main flat portion 11 is parallel to the second folded portion 13. The side of the main flat portion 11 away from the first folded portion 12 is a long side 111, and the portions on both sides that extend beyond the first folded portion 12 are wings 112. The middle portion of the main flat portion 11 near the long side 111 has a protrusion 113 that bulges towards the second folded portion 13. Each wing 112 has a waist-shaped hole 1121. One side of the protrusion 113 has a first round hole 1131, and the other side has a through hole 1132 at the junction with the main flat portion 11. The second folded portion 13 has a second round hole 131 facing the first round hole 1131 and a square notch 132 facing the through hole 1132. One end of the first folded part 12 is provided with a recessed surface 121, and a first rectangular hole 1211 is provided on the recessed surface 121. A second rectangular hole 122 is provided in the middle of the first folded part 12.

[0003] The forming difficulty of the above structure lies in the fact that the main plane portion 11 is generally used as a reference surface during stamping. To facilitate the bending of the first fold portion 12 and the second fold portion 13, the connection position between the connecting material and the main plane portion 11 is generally set on the long side 111. Chinese patent CN120715108A discloses a processing method for a tailgate lock cover. The tailgate lock cover is generally T-shaped bent structure, including a transverse portion, a main bending edge, and a longitudinal portion connected in sequence. The longitudinal portion has a main body, which is a plate surface used for fixed connection. The main body has its rigidity enhanced by the outer side edge and the concave-convex pleated structure in the middle to ensure its flatness. Here, the concave-convex pleated structure has sufficient distance from the connecting material of the connecting area and the forming area. The convex wrinkling does not affect the overall position of the forming area relative to the connecting area, so the connecting material can be located in the relative position of the longitudinal portion. However, if the convex 113 is too close to the long side 111, it will have a huge impact on the accuracy of continuous bending: because the convex embossing will cause severe deformation of the material near the long side 111, which will cause the entire product area to shift significantly relative to the connecting material, thus directly affecting the accuracy of subsequent bending.

[0004] Therefore, it is necessary to design a dedicated continuous stamping method to process the latch plate. Summary of the Invention

[0005] The main objective of this invention is to provide a continuous stamping method for a snap fastener plate, which can prevent the forming of the convex bulge from affecting the relative position of the connecting material in the product area, avoid the problem of inaccurate bending position in the subsequent process, and ensure the overall structural accuracy of the snap fastener plate.

[0006] This invention achieves the above objective through the following technical solution: a continuous stamping method for forming a latching plate, wherein the latching plate includes a main flat portion, a first folded portion, and a second folded portion integrally connected in sequence; the side of the main flat portion away from the first folded portion is a long side, and the portions on both sides that extend beyond the first folded portion are wings; the middle portion of the main flat portion near the long side has a protrusion that bulges towards the second folded portion; the steps include: S1. Punching positioning holes: The material strip is conveyed forward using both sides as positioning references. The processing unit range of the material strip includes a T-shaped product area and a frame-shaped cutting area. The product area includes a transverse portion for forming the main planar portion and a longitudinal portion for forming the first folded portion and the second folded portion. The material strip has a first side near the transverse portion and a second side near the longitudinal portion. The length direction of the transverse portion is along the conveying direction of the material strip. One end of the longitudinal portion is connected to the middle of the transverse portion, and the other end is connected to the cutting area. Several positioning holes are punched within the cutting area as positioning references for subsequent workstations. S2, First trimming: Remove two pieces of side waste material on both sides of the longitudinal part to obtain connecting scrap material close to the second side. The sides of the transverse part of the product area and the opposite sides of the longitudinal part relative to the first side are connected to the connecting scrap material, and the inner contour of the wing, the side contour of the first folded part and the side contour of the second folded part are obtained. S3. Embossing: Embossing is done in the middle of the horizontal part to form the convex bulge; S4. Secondary trimming: T-shaped waste material between adjacent product areas is removed to obtain the outer contour of the wing. The position of each wing relative to the first side edge is connected to the connecting waste material. S5. Punching: Cut all structural holes in the product area; S6. Triple edge trimming: Remove the edge waste near the first side to obtain the outline of the long side, leaving a side overlap between adjacent wings; S7. Step-by-step bending: While keeping the transverse part structure unchanged, the longitudinal part is bent in steps to form the first folded part and the second folded part, and the transverse part becomes the main plane part, thus obtaining the latch plate; S8. Material dropping: Cut off the connecting material between the connecting excess material and the buckle plate, as well as the side overlap, so that the buckle plate falls off.

[0007] Specifically, the positioning holes in step S1 include a first positioning hole and a second positioning hole. The first positioning hole is close to the first side of the material strip and located between the front and rear lateral portions. The first positioning hole is located within the range of the edge waste material obtained later. The second positioning hole is close to the second side of the material strip and located at the opposite position of the first positioning hole. The second positioning hole is located within the range of the connecting residue material obtained later.

[0008] Specifically, in step S2, the overlap connection between the longitudinal portion near the second side and the connecting material is retained, and in step S5, the overlap connection is cut off.

[0009] Furthermore, the second folded surface has a square notch at its edge away from the first folded surface. The square notch is obtained in step S5 when the overlap connection between the longitudinal portion near the second side and the connecting material is cut off.

[0010] Furthermore, the structural holes cut out in step S5 include waist-shaped holes on each wing, a first circular hole on one side of the convex hull, a through hole at the junction of the other side of the convex hull and the main plane, and a second circular hole on the second folded surface. The first circular hole and the second circular hole are directly opposite each other along the thickness direction of the main plane, and the through hole and the square notch are directly opposite each other along the thickness direction of the main plane.

[0011] Furthermore, one end of the first folded section is provided with a sunken surface, which is formed synchronously in step S3.

[0012] Furthermore, a first rectangular hole is provided on the sunken surface, and a second rectangular hole is provided in the middle of the first folded surface. The structural hole cut out in step S5 also includes the first rectangular hole and the second rectangular hole.

[0013] Specifically, in step S7, the angle between the first folded surface and the second folded surface is formed first, and then the angle between the main plane portion and the first folded surface is formed.

[0014] Furthermore, in step S7, the forming of each corner is achieved through two bending steps: the first step is to bend at 45°, and the second step is to bend at 90°. Finally, in step S7, the two corners are shaped.

[0015] The beneficial effects of the technical solution of this invention are: This invention sets the long side edge close to the first side edge of the strip and sets the connecting material on the side of the wing opposite to the long side edge, so that the forming of the convex bulge does not affect the relative position of the connecting material in the product area, and allows the long side edge to be obtained by cutting off the processing allowance, thus avoiding the problem of inaccurate bending position in the later stage and ensuring the overall structural accuracy of the buckle plate. Attached Figure Description

[0016] Figure 1 This is a 3D view of the snap-on plate; Figure 2 A 3D view of the snap-on plate from another perspective; Figure 3 This is a three-dimensional diagram showing the structural changes of the material strip; Figure 4 This is a top view showing the changes in the material strip during the initial stage of processing; Figure 5 This is a top view showing the changes in the material strip during the later stages of processing.

[0017] The diagram is marked as follows: 1-Lock plate, 11-Main plane, 111-Long side, 112-Wing, 1121-Oval hole, 113-Protrusion, 1131-First round hole, 1132-Through hole, 12-First folded surface, 121-Recessed surface, 1211-First rectangular hole, 122-Second rectangular hole, 13-Second folded surface, 131-Second round hole, 132-Square notch; 2-Material strip, 2a-First side, 2b-Second side, 21-Product area, 211-Transverse part, 212-Vertical part, 22-Cut-out area, 22a-Connecting waste, 221a-First positioning hole, 221b-Second positioning hole, 222-Side waste, 223-T-shaped waste, 224-Edge waste, 225-Side overlap. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to specific embodiments.

[0019] Example: like Figures 1 to 3 As shown, this embodiment discloses a continuous stamping method for a latching plate, used for batch integral molding of latching plates 1 for vehicles and equipment cabinets. The latching plate 1 is an integral sheet metal stamping structure, mainly including a main plane portion 11, a first folded portion 12, and a second folded portion 13 connected in sequence. The side of the main plane portion 11 away from the first folded portion 12 is formed as a long side 111. Symmetrically arranged wings 112 are formed on both sides of the main plane portion 11 that extend outwards relative to the first folded portion 12. A convex bump 113 is formed in the middle of the main plane portion 11, near the long side 111, and protrudes upwards towards the second folded portion 13, providing a structural basis for the locking engagement and positioning avoidance of the latch hook.

[0020] like Figures 3 to 5 As shown, this invention uses a long strip material 2 for continuous high-speed stamping. The strip material 2 has a first side 2a and a second side 2b arranged opposite to each other. The first side 2a is close to the transverse conveying section of the strip material 2, and the second side 2b is close to the longitudinal forming section of the strip material 2. The strip material 2 is divided into several continuously arranged processing units along the conveying direction. The range of a single processing unit includes a T-shaped product area 21 and a frame-shaped cutting area 22. The product area 21 includes a transverse part 211 for forming the main flat part 11 and a longitudinal part 212 for forming the first folded part 12 and the second folded part 13. The length direction of the transverse part 211 is consistent with the conveying direction of the strip material 2. One end of the longitudinal part 212 is integrally connected to the middle of the transverse part 211, and the other end extends to the cutting area 22. Through multi-station continuous step-by-step stamping, trimming, forming, bending, and blanking, the integrated continuous mass production processing of the buckle plate 1 is realized. The specific stamping steps are as follows: S1, punch positioning hole Using the first side 2a and the second side 2b of the strip 2 as references, the strip 2 is conveyed forward at a uniform speed. Two sets of positioning holes are punched within the cutting area 22 of the strip 2, namely the first positioning hole 221a and the second positioning hole 221b, which serve as precise positioning references for all subsequent stamping stations, ensuring the coaxiality and dimensional accuracy of each station. The first positioning hole 221a is close to the first side 2a of the strip 2 and is located between the transverse portions 211 of two adjacent product areas 21. The first positioning hole 221a is completely within the edge scrap 224 to be removed in subsequent processes and is removed along with the scrap after processing, without affecting the main structure of the product. The second positioning hole 221b is directly opposite the first positioning hole 221a, close to the second side 2b of the strip 2, and located within the connecting scrap 22a to be retained in subsequent processes, providing positioning support for the strip conveying and stamping throughout the process. The cutting area 22 is frame-shaped, so all contours of the locking plate 1 do not overlap with the edge of the strip 2 itself. The portion of the cut-off area 22 near the second side 2b is set as the connecting material 22a to maintain the continuity of the strip 2, while the portion near the first side 2a is to provide machining allowance for the outer side of the long side 111 for embossing. Because forming the convex 113 will cause significant inward deformation of the material in the first side 2a portion, the edge of the long side 111 cannot be set as the location of the connecting material between the product area 21 and the connecting material 22a. Therefore, the connecting material must be set on the opposite side of the long side 111 (corresponding to the opposite side of the long side 111 on the wing 112).

[0021] S2, One-time edge trimming By using a stamping die to remove two pieces of side scrap 222 from both sides of the longitudinal portion 212, the opposite sides of the transverse portion 211 and the longitudinal portion 212 relative to the first side 2a of the product area 21 are all connected and fixed to the connecting scrap 22a. This process, through precise edge cutting, initially shapes the inner contour of the wing portion 112, the side contour of the first folded portion 12, and the side contour of the second folded portion 13, completing the shaping of the basic lateral contour of the product. At the same time, the reserved overlap ensures the connection strength between the strip and the product, preventing the product from falling off or shifting during the stamping process.

[0022] In order to prevent the material on the second side 2b, which is far from the embossed 113, from being pulled closer, this step needs to maintain the overlap connection between the part of the longitudinal portion 212 near the second side 2b and the connecting material 22a, so that the material near the second side 2b can hold the product area 21.

[0023] S3, embossing The central area of ​​the transverse portion 211 is stamped and embossed to form a convex bump 113 in one piece. Simultaneously, a recessed surface 121 is stamped and formed at the end of the first folded portion 12. The convex bump and recessed surface are formed simultaneously in a single stamping operation, simplifying the stamping process, reducing the number of mold stations, improving processing efficiency, and ensuring the integrity and dimensional consistency of the formed structure. With machining allowance already left at the edge of the cutting area 22, the material edge shrinkage caused by the convex bump 113 and recessed surface 121 will be adjusted to the target structure in subsequent trimming steps.

[0024] S4, Secondary trimming The T-shaped waste 223 between two adjacent product areas 21 is removed by die punching, completely separating the connecting waste between the front and rear product units, while precisely forming the outer contour of the two side wings 112. After this process is completed, the wing 112 is only connected to the connecting waste 22a at the position relative to the first side 2a, and the rest of the contour is completely formed, and the outer contour of the main plane part 11 of the latch plate is basically finalized.

[0025] S5, punching This station is a multi-functional composite stamping station that completes edge cutting, punching of all structural holes, and square notch forming in one go. Although the product area 21 has unevenness at this time, the main surface (especially the area corresponding to the first folded surface 12 and the second folded surface 13) is still in the horizontal direction. Therefore, in order to save steps, all functional structural holes of the buckle plate 1 are punched and formed simultaneously. The structural holes here specifically include: the waist-shaped hole 1121 on the two wings 112 for assembly and adjustment, the first round hole 1131 on one side of the convex hull 113, the through hole 1132 at the junction of the other side of the convex hull 113 and the main plane 11, the second round hole 131 on the second folded surface 13, the first rectangular hole 1211 on the recessed surface 121, and the second rectangular hole 122 in the middle of the first folded surface 12.

[0026] In addition, in order to allow subsequent bending, the reserved overlap between the longitudinal portion 212 near the second side 2b and the connecting scrap 22a also needs to be cut off at this time, so that the main body of the product and the side scrap are initially separated; at the same time, the square notch 132 on the edge of the second folded part 13 is punched and formed in this punching cycle. That is, the connection position between the connecting scrap 22a and the longitudinal portion 212 is set at the location of the square notch 132, so that the accuracy of the square notch 132 during forming can be maximized.

[0027] S6, Triple edge trimming The edge waste 224 of the material strip 2 near the first side 2a is precisely cut off to obtain a complete and flat long side 111. This removes burrs and excess waste from the product edges, ensuring that the locking plate 1's dimensions meet design standards, but leaves a side overlap 225 between adjacent wings 112. The side overlap 225 provides self-support between adjacent product areas 21, preventing the lateral portion 211 from deviating from the conveyor plane during subsequent bending. In this embodiment, because the bending and cutting off the edge waste 224 occur at a relatively far distance within the same processing unit, the three edge-cutting operations are actually completed at the same station as the first 45° bending operation of the subsequent bending.

[0028] S7, Step-by-step bending While maintaining the flatness and non-deformation of the transverse part 211 throughout the process, the longitudinal part 212 is bent and formed in stages, forming the first folded part 12 and the second folded part 13 in sequence, so that the transverse part 211 is shaped into the main plane part 11 of the locking plate 1, and the locking plate 1 is connected to the connecting scrap 22a with an overlap edge.

[0029] This process employs a differentiated, step-by-step bending logic, prioritizing the forming of the angle between the first folded section 12 and the second folded section 13, followed by the forming of the angle between the main plane section 11 and the first folded section 12, effectively reducing cumulative errors. Each angle utilizes a two-step progressive bending process: the first step involves a 45° pre-bending to release internal stress in the sheet metal; the second step involves a direct bend to the standard 90° forming angle, eliminating the problems of sheet metal cracking and springback deformation caused by single right-angle bending. After all bending processes are completed, both angles undergo uniform shaping to correct bending springback errors, ensuring that the perpendicularity and flatness of the angles meet assembly and usage requirements.

[0030] After forming, the first round hole 1131 and the second round hole 131 are aligned vertically to achieve locking positioning and avoidance matching; the through hole 1132 and the square notch 132 are aligned along the thickness direction of the strip 2 (that is, along the thickness direction of the main plane part 11), which can not only meet the clearance requirements of stamping and release the bending stress of sheet metal, but also achieve the space avoidance of anti-rotation limit in double-layer plate assembly, ensuring the assembly accuracy and stability of the structure.

[0031] S8, Material Cutting The last connecting material between the locking plate 1 and the remaining connecting material 22a (located between the wing 112 and the connecting material 22a) and the side overlap 225 between adjacent wings 112 are cut off, so that the finished locking plate 1 is automatically dropped and discharged, completing the continuous stamping process of a single product. The material strip is continuously conveyed and enters the next cycle of stamping process, realizing automated continuous mass production.

[0032] This embodiment utilizes the aforementioned step-by-step continuous stamping process, relying on a T-shaped product area layout, multi-station composite stamping, and step-by-step progressive bending and shaping, to form an integrated snap-lock plate with convex bumps, multiple holes, bending structures, and limiting notches in one go. The process layout is reasonable, the forming accuracy is high, and the product consistency is good. It can effectively solve the technical problems of easy deformation, hole position deviation, bending springback, and cumbersome processes in traditional stamping processes, and significantly improve the production efficiency and finished product quality of snap-lock plates.

[0033] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A continuous stamping method for forming a latching plate, the latching plate comprising a main flat portion, a first folded portion, and a second folded portion integrally connected in sequence, wherein the side of the main flat portion away from the first folded portion is a long side, and the portions on both sides extending beyond the first folded portion are wings, and the middle portion of the main flat portion near the long side has a protrusion rising towards the second folded portion; characterized in that, the step include: S1. Punching positioning holes: The material strip is conveyed forward using both sides as positioning references. The processing unit range of the material strip includes a T-shaped product area and a frame-shaped cutting area. The product area includes a transverse portion for forming the main planar portion and a longitudinal portion for forming the first folded portion and the second folded portion. The material strip has a first side near the transverse portion and a second side near the longitudinal portion. The length direction of the transverse portion is along the conveying direction of the material strip. One end of the longitudinal portion is connected to the middle of the transverse portion, and the other end is connected to the cutting area. Several positioning holes are punched within the cutting area as positioning references for subsequent workstations. S2, First trimming: Remove two pieces of side waste material on both sides of the longitudinal part to obtain connecting scrap material close to the second side. The sides of the transverse part of the product area and the opposite sides of the longitudinal part relative to the first side are connected to the connecting scrap material, and the inner contour of the wing, the side contour of the first folded part and the side contour of the second folded part are obtained. S3. Embossing: Embossing is done in the middle of the horizontal part to form the convex bulge; S4. Secondary trimming: T-shaped waste material between adjacent product areas is removed to obtain the outer contour of the wing. The position of each wing relative to the first side edge is connected to the connecting waste material. S5. Punching: Cut all structural holes in the product area; S6. Triple edge trimming: Remove the edge waste near the first side to obtain the outline of the long side, leaving a side overlap between adjacent wings; S7. Step-by-step bending: While keeping the transverse part structure unchanged, the longitudinal part is bent in steps to form the first folded part and the second folded part, and the transverse part becomes the main plane part, thus obtaining the latch plate; S8. Material dropping: Cut off the connecting material between the connecting excess material and the buckle plate, as well as the side overlap, so that the buckle plate falls off.

2. The continuous stamping method for the latch plate according to claim 1, characterized in that: The positioning holes in step S1 include a first positioning hole and a second positioning hole. The first positioning hole is close to the first side of the material strip and is located between the front and rear lateral portions. The first positioning hole is located within the range of the edge waste material obtained later. The second positioning hole is close to the second side of the material strip and is located in a position opposite to the first positioning hole. The second positioning hole is located within the range of the connecting residue material obtained later.

3. The continuous stamping method for the latch plate according to claim 2, characterized in that: In step S2, the overlap connection between the longitudinal portion near the second side and the connecting material is retained, and in step S5, the overlap connection is cut off.

4. The continuous stamping method for the latch plate according to claim 3, characterized in that: The second folded surface has a square notch at its edge away from the first folded surface. The square notch is obtained in step S5 when the overlap between the longitudinal portion near the second side and the connecting material is cut off.

5. The continuous stamping method for the latch plate according to claim 4, characterized in that: The structural holes cut out in step S5 include waist-shaped holes on each wing, a first circular hole on one side of the convex hull, a through hole at the junction of the other side of the convex hull and the main plane, and a second circular hole on the second folded surface. The first circular hole and the second circular hole are directly opposite each other along the thickness direction of the main plane, and the through hole and the square notch are directly opposite each other along the thickness direction of the main plane.

6. The continuous stamping method for the latch plate according to claim 5, characterized in that: One end of the first folded section has a sunken surface, which is formed synchronously in step S3.

7. The continuous stamping method for the latch plate according to claim 6, characterized in that: The sunken surface is provided with a first rectangular hole, and the middle part of the first folded surface is provided with a second rectangular hole. The structural hole cut out in step S5 also includes the first rectangular hole and the second rectangular hole.

8. The continuous stamping method for the latch plate according to claim 1, characterized in that: In step S7, the angle between the first folded surface and the second folded surface is formed first, and then the angle between the main plane portion and the first folded surface is formed.

9. The continuous stamping method for the latch plate according to claim 1, characterized in that: In step S7, each corner is formed by two bending steps: the first step bends at 45° and the second step bends at 90°. Finally, the two corners are shaped in step S7.

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