A continuous stamping method for high and low surface square frame plates

Abstract

The present invention belongs to the technical field of stamping processing, and relates to a continuous stamping forming method of a high-low surface square frame plate, the steps of which include: punching positioning holes, cutting outer edges, bending once, bending twice, punching structural holes, shaping and blanking. In the design, the method first divides the square frame into four independent L-shaped parts, and in the forming, the four L-shaped parts are connected to the plane part through a transition zone respectively to obtain a blank, and then the four L-shaped plates are connected end to end through two bending and shaping, which is convenient for welding into a complete square frame, so that the blank is transformed into a square frame plate with high and low surfaces, and the manufacturing continuity is good, the working efficiency is high, the material thickness is uniform, and the dimensional accuracy and strength requirements can be met.

Description

Technical Field

[0001] The invention relates to the technical field of stamping processing, in particular to a continuous stamping forming method for a high-low surface square frame plate. Background Art

[0002] Metal stamping is a common process for processing many metal products. As customer needs diversify, mold design must also meet various product requirements.

[0003] Figure 1 The figure shows a square frame plate 1, which comprises a square frame 11, a flat plate portion 12 parallel to the plane where the square frame 11 is located, and four transition zones 13 connected from the four corners of the flat plate portion 12 to the square frame 11, respectively. The flat plate portion 12 has an irregular structure of a clearance hole 121 and a circular second circular hole 122, and the square frame 11 is provided with a first circular hole 1101 at the four corners near the positions of the four transition zones 13. Here, the height of the transition zone 13 reaches 5 to 10 times the thickness of the material, and the angles of the two sides of the transition zone 13 reach 60° to 90°.

[0004] Chinese patent CN115069895A discloses a forming process of a shielding frame, which has an outer frame of a rectangular frame structure, a disc at different heights from the outer frame, and a plurality of connecting strips connecting the outer side of the disc to the inner side of the outer frame. The forming method adopted here is to punch positioning holes, roughly cut inner holes, punch bosses, and finely cut bosses. The rough cutting of the inner holes is to allow the material strip to form a frame area including the outer frame range and a block area including the disc range, leaving a deformation margin, and the two are connected by a strip area, so that the frame area and the block area can be formed on different planes while keeping the strip area unbroken. Finally, the part of the deformation margin is removed by fine cutting to obtain a structure similar to the square frame plate 1, but because there are some structural differences between the two products, the square frame plate cannot be formed by the above method. The shielding frame is a thin plate used in electronic products. Only the outer frame is a useful part. The disc and the connecting strip exist only to facilitate mechanical placement. Therefore, there is no high strength requirement for the disc and the connecting strip. In order to facilitate pulling off from the outer frame, the connection position needs to be deliberately made weaker. The disc only needs to be about 1mm higher than the outer frame, which is only one or two times the thickness of the material. The elongation rate of the connecting belt is less than 10%, and it is not easy to be broken. The length of the transition belt 13 on the square frame plate 1 is several times the thickness of the material, but it is impossible to make the thickness of the transition belt 13 thinner to 1 / 10~1 / 5 by stretching. Manufacturing the transition belt 13 will only cause the material to break, and it is impossible to meet the thickness requirements.

[0005] Therefore, it is necessary to design a new molding method to solve the above problems. Summary of the invention

[0006] The main purpose of the present invention is to provide a continuous stamping forming method for high-low surface square frame plates, which can continuously form square frame plates, ensure the uniformity of material thickness, and meet the structural strength requirements of the product.

[0007] The present invention achieves the above-mentioned object through the following technical scheme: a continuous stamping forming method of a high-low surface square frame plate, which is used to form a square frame plate, wherein the frame plate comprises a square frame, a flat plate portion parallel to the plane where the frame is located, and four transition zones connected from the four corners of the flat plate portion to the frame, respectively, wherein the flat plate portion has an air avoidance hole and a second circular hole, and the square frame is provided with a first circular hole at the four corners near the four transition zones, and the process steps include:

[0008] S1. Punching positioning block holes: prepare a material belt, the processing unit range of the material belt includes a molding area and a connecting area surrounding the molding area, the molding area is in the shape of an "I" character and its length direction is perpendicular to the conveying direction of the material belt, the connecting area is a grid structure and the left and right sides are connected to the two sides of the middle part of the molding area through a connecting belt respectively, two outer positioning holes are punched out at the corner points of the grid structure of the connecting area, and two inner positioning holes are punched out in the molding area, and the inner positioning holes are located on the inner side of the connection position between the molding area and the connecting belt;

[0009] S2, cutting the outer edge: taking the outer positioning hole and the inner positioning hole as reference, cutting out a blank with an X-shaped plane structure within the scope of the forming area, wherein the blank comprises a flat plate portion, four transition zones and four L-shaped portions, wherein the inner side of the corner of each L-shaped portion is connected to the flat plate portion via a transition zone, the four L-shaped portions are independent of each other, and the left and right sides of the flat plate portion are respectively connected to a connecting zone;

[0010] S3, one-time bending: taking the outer positioning hole and the inner positioning hole as reference, the transition zone is folded 40° to 50° toward the front side relative to the flat plate portion, and the L-shaped portion is folded 70° to 90° toward the back side relative to the nearest transition zone;

[0011] S4, secondary bending: taking the outer positioning hole and the inner positioning hole as reference, the transition zone is further folded toward the front relative to the flat plate portion, so that the four L-shaped portions have the same height and are connected head to tail to form the square frame;

[0012] S5, punching structural holes: taking the outer positioning hole as a reference, cutting out the air-avoiding hole and the second circular hole on the flat plate portion, and cutting out four first circular holes on the four L-shaped portions respectively, and the two inner positioning holes are located within the range of the air-avoiding hole;

[0013] S6, shaping: taking the outer positioning hole, the second circular hole and the first circular hole as reference, performing plane shaping on the four L-shaped portions;

[0014] S7, blanking: using the outer positioning hole as a reference, disconnecting the flat plate portion from the connecting belt to obtain the square frame plate.

[0015] Specifically, each processing unit includes two molding areas separated by the connecting area on the left and right, and each molding area is formed into a square frame plate.

[0016] Furthermore, the four L-shaped portions are a first L-shaped portion, a second L-shaped portion, a third L-shaped portion and a fourth L-shaped portion, the first L-shaped portion and the second L-shaped portion are located at both ends of the first diagonal of the blank, the third L-shaped portion and the fourth L-shaped portion are located at both ends of the second diagonal of the blank, both ends of the first L-shaped portion and both ends of the second L-shaped portion are provided with external extension portions, both ends of the third L-shaped portion and both ends of the fourth L-shaped portion are provided with internal extension portions, the external extension portions are matched with the internal extension portions in a concave-convex manner, thereby forming a weld with a zigzag structure therebetween.

[0017] Specifically, in the secondary bending step, the third L-shaped portion and the fourth L-shaped portion reach the post-forming position first, and the first L-shaped portion and the second L-shaped portion reach the post-forming position later.

[0018] Specifically, the outer edge of the blank is processed by multi-step stamping, and the waste materials on both sides of the connecting belt and the connecting area are cut off by different steps and divided into a plurality of block-shaped waste materials or L-shaped waste materials.

[0019] The beneficial effects of the technical solution of the present invention are:

[0020] In the method, the square frame is first divided into four independent L-shaped parts in the design. In the forming process, the four L-shaped parts are respectively connected to the plane part through a transition zone to obtain a blank. Then, the four L-shaped plates are connected end to end through two bending and shaping processes to facilitate welding into a complete square frame. The blank is transformed into a square frame plate with high and low surfaces. The manufacturing continuity is good, the working efficiency is high, the material thickness is uniform, and the dimensional accuracy and strength requirements can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional diagram of a square frame plate;

[0022] Figure 2 This is the design structure diagram of the frame plate;

[0023] Figure 3 It is the structural change diagram of the material strip;

[0024] Figure 4 This is a diagram of the local change state of the material strip during the first bending and second bending steps.

[0025] The markings in the figure are:

[0026] 1-square frame plate, 11-square frame, 1101-first circular hole, 111a-first L-shaped portion, 111b-second L-shaped portion, 1111-outer extension portion, 112c-third L-shaped portion, 112d-fourth L-shaped portion, 1121-inner extension portion, 12-flat plate portion, 121-avoidance hole, 122-second circular hole, 13-transition zone, 14-weld;

[0027] 2-material strip, 21-forming area, 210-blank, 211-inner positioning hole, 212-block waste, 213-L-shaped waste, 22-connecting area, 221-outer positioning hole, 222-connecting strip. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to specific embodiments.

[0029] Example:

[0030] The present invention provides a continuous stamping method for a high-low surface square frame plate, the process steps comprising:

[0031] S1. Punching positioning block holes: prepare a material strip 2. The processing unit range of the material strip 2 includes a forming area 21 and a connecting area 22 surrounding the forming area 21. The forming area 21 is in the shape of an "I" and its length direction is perpendicular to the conveying direction of the material strip 2. The connecting area 22 is a grid structure and the left and right sides are connected to the two sides of the middle of the forming area 21 through a connecting belt 222. Two outer positioning holes 221 are punched out at the corners of the grid structure of the connecting area 22, and two inner positioning holes 211 are punched out in the forming area 21. The inner positioning holes 211 are located on the inner side of the connection position between the adjacent forming area 21 and the connecting belt 222. Figure 3 shown.

[0032] The material strip 2 as a whole relies on the outer positioning hole 221 to control the stepping distance, so that the mold and the molding area 21 are roughly positioned, and the inner positioning hole 211 is located in the middle of the molding area 21, so that the position in the continuous stamping can be better defined here. In order to shorten the conveying length of the mold, the width direction of the molding area 21 is along the conveying direction of the material strip 2.

[0033] Each processing unit range may have only one molding area 21, but if the mold width allows, each processing unit range may include two molding areas 21 separated by a connecting area 22, and each molding area 21 is formed into a square frame plate 1. In this embodiment, the square frame plate 1 is a pair of mirrored parts, so the method of arranging two molding areas 21 side by side is adopted here. If the square frame plate 1 is not a mirrored part, but is manufactured in a one-out-two manner, then the method of arranging two molding areas 21 side by side can also be adopted. In both cases, the connecting area 22 forms a Japanese grid structure. In this way, the same set of molds can complete the processing of two sets of products at the same time, and the manufacturing efficiency is higher.

[0034] S2, cutting the outer edge: Based on the outer positioning hole 221 and the inner positioning hole 211, cut out the blank 210 with an X-shaped plane structure within the range of the forming area 21. The blank 210 includes a flat plate portion 12, four transition strips 13 and four L-shaped portions (the first L-shaped portion 111a, the second L-shaped portion 111b, the third L-shaped portion 112a, and the fourth L-shaped portion 112b). The inner side of the corner of each L-shaped portion is connected to the flat plate portion 12 through a transition strip 13. The four L-shaped portions are independent of each other, and the left and right sides of the flat plate portion 12 are each connected to a connecting strip 222. Figure 3 shown.

[0035] The blank 210 is an intermediate formed body of the frame plate 1 and is a material still in a plane state. The L-shaped portion is a semi-suspended structure on the material strip 2 that is not directly connected to the connection area 22. In this embodiment, the frame 11 is composed of four L-shaped portions welded together. The advantage of this is that the thickness of the transition zone 13 is the original thickness of the material strip 2. The manufacturing method does not rely on stretching, but on direct bending, which meets the strength requirements.

[0036] The outer edge of the blank 210 is processed by multi-step stamping. The waste part on each molding area 21 will be in two "E" shapes. First, the waste cut out of the outer contour of the L-shaped part should avoid opposite edges, otherwise it is easy to get stuck and cause mold collision problems; second, the structure of the connecting belt 222 and the material of the connecting area 22 between the front and rear molding areas 21 are relatively thin. If both sides are punched at the same time, it is easy to get stuck or break the material. The above two problems lead to the waste on both sides of the connecting belt 222 and the two sides of the connecting area 22 in the outer edge cutting step being cut off in different steps and the waste must be divided into several block-shaped waste 212 or L-shaped waste 213. If a one-out-two process is adopted, the staggered stamping positions between the two molding areas 21 must be considered.

[0037] S3, one-time bending: with the outer positioning hole 221 and the inner positioning hole 211 as reference, the transition zone 13 is folded 40° to 50° toward the front side relative to the flat plate portion 12, and the L-shaped portion is folded 70° to 90° toward the back side relative to the nearest transition zone 13. Figure 3 and Figure 4 shown.

[0038] Because the flat plate portion 12 and the square frame 11 are ultimately parallel, the folding angles on both sides of the transition zone 13 should be equal and opposite, but here we need to avoid the problem of the punching force perpendicular to the material plate surface being too large and breaking the material, so the front folding of the transition zone 13 should be done twice; and the reverse folding between the L-shaped portion and the transition zone 13 can be formed in one step by V-bending. The second bending can correct the folding angle of the transition zone 13 relative to the flat plate portion 12.

[0039] S4, secondary bending: With the outer positioning hole 221 and the inner positioning hole 211 as reference, the transition zone 13 is further folded toward the front relative to the flat plate portion 12, so that the four L-shaped portions have the same height and are connected head to tail to form a square frame 11. Figure 3 and Figure 4 shown.

[0040] The four L-shaped portions are a first L-shaped portion 111a, a second L-shaped portion 111b, a third L-shaped portion 112a and a fourth L-shaped portion 112b. The first L-shaped portion 111a and the second L-shaped portion 111b are located at both ends of the first diagonal line of the blank 210, and the third L-shaped portion 112a and the fourth L-shaped portion 112b are located at both ends of the second diagonal line of the blank 210. Both ends of the first L-shaped portion 111a and both ends of the second L-shaped portion 111b are provided with outer extension portions 1111, and both ends of the third L-shaped portion 112a and both ends of the fourth L-shaped portion 112b are provided with inner extension portions 1121. The outer extension portion 1111 and the inner extension portion 1121 are matched with each other in a concave-convex manner, thereby forming a weld 14 with a folded line structure therebetween.

[0041] Because the square frame 11 in this design has become a whole formed by butt welding, if the adjacent L-shaped parts are only overlapped by neat cross-sections, the welding strength is not high; therefore, in order to ensure the welding strength, it is necessary to appropriately increase the length of the weld 14, so it is necessary to make the outer extension 1111 and the inner extension 1121 match concavely and convexly, so that the weld 14 becomes a broken line structure, which extends the welding length and ensures the welding strength. The broken line structure here is not limited to the stepped structure, and a sawtooth structure, a trapezoidal tooth structure, and other concave-convex matching structures with the effect of lengthening the weld can also be selected. However, it is also necessary to consider that space for the connecting belt 222 needs to be left on one side of the short side of the square frame 11, so the outer extension 1111 and the inner extension 1121 on the left and right sides of the material strip 2 should be appropriately shortened.

[0042] Here, the reason why the outer extension part 1111 is arranged on two L-shaped parts of one diagonal line and the inner extension part 1121 is arranged on two L-shaped parts of another diagonal line is to facilitate the final structural control of the secondary bending. Because the inner extension part 1121 is closer to the inside than the outer extension part 1111, it is better to put it in place first, and then let the outer extension part 1111 reach the outside of the inner extension part 1121. If the order is reversed, the inner extension part 1121 will interfere with the deformation path of the outer extension part 1111. Therefore, in the secondary bending step, the third L-shaped part 112a and the fourth L-shaped part 112b should reach the post-forming position first, and the first L-shaped part 111a and the second L-shaped part 111b should reach the post-forming position later.

[0043] S5, punching structural holes: Based on the outer positioning hole 221, cut out the air-avoiding hole 121 and the second circular hole 122 on the flat plate portion 12, and cut out four first circular holes 1101 on the four L-shaped portions respectively, and the two inner positioning holes 211 are located within the range of the air-avoiding hole 121. Figure 3 shown.

[0044] When designing the position of the first circular hole 1101, it is necessary to consider that it cannot be left on the final product, so the position of the first circular hole 1101 should be designed within the cut-out area of ​​the air-avoiding hole 121. In addition, in this step, the flat plate portion 12 and the outer frame 11 are already basically in a horizontal position, and the blank 210 no longer has a large bending or stretching deformation, so at this time, the positions of the air-avoiding hole 121, the second circular hole 122 and the first circular hole 1101 are more accurate.

[0045] S6, shaping: taking the outer positioning hole 221, the second circular hole 122 and the first circular hole 1101 as reference, the four L-shaped parts are plane shaped. Figure 3 shown.

[0046] Because the four L-shaped parts are bent into place separately, the material rebound will cause the flatness of the four parts to not meet the standard immediately, so they need to be reshaped to meet the product dimensional accuracy requirements. The second circular hole 122 and the first circular hole 1101 can be temporarily used as positioning holes as the reference position for plane shaping.

[0047] S7, blanking: Using the outer positioning hole 221 as a reference, the flat plate portion 12 and the connecting belt 222 are disconnected to obtain the square frame plate 1. Figure 2 and Figure 3 shown.

[0048] In the design of the method, the square frame 11 is first divided into four independent L-shaped parts. During the molding, the four L-shaped parts are respectively connected to the plane part 12 through a transition zone 13 to obtain a blank 210. Then, the four L-shaped plates are connected end to end through two bending and shaping, which is convenient for welding into a complete square frame 11, so that the blank 210 is transformed into a square frame plate 1 with high and low surfaces. The manufacturing continuity is good, the working efficiency is high, the material thickness is uniform, and the dimensional accuracy and strength requirements can be met.

[0049] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A continuous stamping method for forming a high-low surface square frame plate, used to form a square frame plate, the frame plate comprises a square frame, a flat plate portion parallel to the plane where the frame is located, and four transition zones connected from the four corners of the flat plate portion to the frame, the flat plate portion has a clearance hole and a second circular hole, the square frame is provided with a first circular hole at the four corners near the four transition zones, characterized in that The process steps include: S1. Punching positioning block holes: prepare a material belt, the processing unit range of the material belt includes a molding area and a connecting area surrounding the molding area, the molding area is in the shape of an "I" character and its length direction is perpendicular to the conveying direction of the material belt, the connecting area is a grid structure and the left and right sides are connected to the two sides of the middle part of the molding area through a connecting belt respectively, two outer positioning holes are punched out at the corner points of the grid structure of the connecting area, and two inner positioning holes are punched out in the molding area, and the inner positioning holes are located on the inner side of the connection position between the molding area and the connecting belt; S2, cutting the outer edge: taking the outer positioning hole and the inner positioning hole as reference, cutting out a blank with an X-shaped plane structure within the range of the forming area, wherein the blank comprises a flat plate portion, four transition zones and four L-shaped portions, wherein the inner side of the corner of each L-shaped portion is connected to the flat plate portion via a transition zone, the four L-shaped portions are independent of each other, and the left and right sides of the flat plate portion are respectively connected to a connecting zone; S3, one-time bending: taking the outer positioning hole and the inner positioning hole as reference, the transition zone is folded 40° to 50° toward the front side relative to the flat plate portion, and the L-shaped portion is folded 70° to 90° toward the back side relative to the nearest transition zone; S4, secondary bending: taking the outer positioning hole and the inner positioning hole as reference, the transition zone is further folded toward the front relative to the flat plate portion, so that the four L-shaped portions have the same height and are connected head to tail to form the square frame; S5, punching structural holes: taking the outer positioning hole as a reference, cutting out the air-avoiding hole and the second circular hole on the flat plate portion, and cutting out four first circular holes on the four L-shaped portions respectively, and the two inner positioning holes are located within the range of the air-avoiding hole; S6, shaping: taking the outer positioning hole, the second circular hole and the first circular hole as reference, performing plane shaping on the four L-shaped portions; S7, blanking: using the outer positioning hole as a reference, disconnecting the flat plate portion from the connecting belt to obtain the square frame plate.

2. The continuous stamping method of high-low surface frame plate according to claim 1 is characterized in that: Each processing unit range includes two forming areas separated by the connecting area on the left and right, and each forming area is formed into a square frame plate.

3. The continuous stamping method of high-low surface frame plate according to claim 1 or 2, characterized in that: The four L-shaped portions are a first L-shaped portion, a second L-shaped portion, a third L-shaped portion and a fourth L-shaped portion. The first L-shaped portion and the second L-shaped portion are located at the two ends of the first diagonal line of the blank, and the third L-shaped portion and the fourth L-shaped portion are located at the two ends of the second diagonal line of the blank. Both ends of the first L-shaped portion and both ends of the second L-shaped portion are provided with external extension portions, and both ends of the third L-shaped portion and both ends of the fourth L-shaped portion are provided with internal extension portions. The external extension portions are matched with the internal extension portions in a concave-convex manner, thereby forming a weld with a zigzag structure therebetween.

4. The continuous stamping method of high-low surface frame plate according to claim 3 is characterized in that: In the secondary bending step, the third L-shaped portion and the fourth L-shaped portion reach the post-forming position first, and the first L-shaped portion and the second L-shaped portion reach the post-forming position later.

5. The continuous stamping method of high-low surface frame plate according to claim 1, characterized in that: The outer edge of the blank is processed by a multi-step stamping method.

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