A continuous stamping method for side belt tab punch

Abstract

The present application relates to a kind of continuous stamping methods of side strip flanging punch, steps include: punch positioning hole, punch, pre-cut, bend, trim, cut hole and blanking;Wherein pre-cut step removes the waste outside the processing area, obtains blank, and the blank has protruding part, reinforcing part, annular preforming part, flat sheet part and tab part, annular preforming part corresponds annular part, tab part is connected to one side of flat sheet part, reinforcing part is connected to the other side of flat sheet part and extends from the opposite position of tab part to one side of tab part.This method first reserves reinforcing part at the opposite position of flanging part, removes reinforcing part after flanging part is bent, so that the profile structure of side strip flanging punch meets the design requirements.The structure of reinforcing part is not only the extension of force arm, but also uses the structural rigidity of tab part itself to pull material, so that bending stress is further dispersed, and the influence of local deformation is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stamping processing, in particular to a continuous stamping method for a side-bent tab bulging piece. BACKGROUND

[0002] Metal stamping is a common method for processing metal products. With the diversification of customer needs, the design of the mold also needs to adapt to various product needs. Almost all workpieces with complex structures are manufactured by continuous stamping. Metal stamping is generally carried out by cutting a metal strip with a certain width as the raw material, and then through cutting, bulging, bending, and riveting to obtain the final product structure.

[0003] Figure 1 The conductive bracket shown is a side-bent tab bulging piece 1, which includes an annular portion 11, a flat tab portion 12, and a tab portion 13 connected in sequence. The tab portion 13 has a long protrusion 131 extending along its length direction, and the flat tab portion 12 has a 90° bent tab portion 121 on one side. The tab portion 13 has a through hole 132 at the end away from the annular portion 11. This conductive bracket is stamped and processed from a complete flat tab, and the difficulty in forming lies in that the long protrusion 131 does not extend to the flat tab portion 12, but the bent tab portion 121 needs to bend the side material of the flat tab portion 12 to obtain it. The width of the flat tab portion 12 is limited, and the strength is poor. Bending will cause a large torque on the flat tab portion 12, causing plastic deformation of the flat tab portion 12, which will affect the accuracy of the annular portion 11.

[0004] Chinese patent CN115430773B discloses a continuous stamping method for a side-bent tab bulging piece, which has a narrow flange with a very small width on the high-low surface, and the two sides of the high-low surface have a first bent surface and a second bent surface, respectively. The first bent surface is adjacent to the narrow flange. The narrow flange needs to be coplanar with the first bent surface, but when the first bent surface is formed, the narrow flange will be deformed due to its small size and inability to resist the bending torque. The solution of the invention is to intentionally extend the width of the narrow flange in the stamping process, so that the position adjacent to the first bent surface can resist the bending torque, and then the excess part of the narrow flange is cut off after the first bent surface is formed. Although the width of the flat tab portion 12 is wider than that of the narrow flange, the deformation of the flat tab portion 12 adjacent to the annular portion 11 will affect the circularity of the annular portion 11.

[0005] Therefore, it is necessary to design a new stamping method to solve the above problems. SUMMARY

[0006] The main purpose of the present application is to provide a continuous stamping method for a side-bent tab bulging piece, which can obtain a workpiece structure with a bent tab portion adjacent to the annular portion, and ensure the circularity of the annular portion.

[0007] The application realizes the above-mentioned purpose through the following technical scheme: a continuous stamping method for side strip with a flange, which is used for forming a side strip with a flange, and the structure of the side strip with a flange includes a ring part, a flat part and a flange part connected in sequence, the flange part has a long protrusion extending along the length direction of the flange part, one side of the flat part is provided with a 90° folded flange part, and the flange part is provided with a through hole at the end away from the ring part; the steps include:

[0008] S1, punching a positioning hole: the processing unit range includes a connecting area and a processing area in the design, the first end and both sides of the strip are positioned, a positioning hole is punched in the connecting area, and a process hole is punched in the processing area, the process hole corresponds to the inner hole of the ring part, and the diameter of the process hole is smaller than the inner diameter of the ring part;

[0009] S2, punching a flange: the long protrusion is punched in the center of the processing area based on the positioning hole and the process hole;

[0010] S3, pre-cutting: the waste material outside the processing area is cut off based on the positioning hole and the process hole to obtain a blank, the blank has a protruding part, a reinforcing part, a ring preforming part, the flat part and the flange part, the ring preforming part corresponds to the ring part, the flange part is connected to one side of the flat part, and the reinforcing part is connected to the other side of the flat part and extends from the opposite position of the flange part to one side of the flange part;

[0011] S4, bending: the protruding part is folded down by 90° to form the flange part based on the positioning hole and the process hole;

[0012] S5, trimming: the reinforcing part is cut off based on the positioning hole and the process hole;

[0013] S6, hole cutting: the waste material inside the ring preforming part is cut off based on the positioning hole to obtain the ring part, and the through hole is cut in the flange part to obtain the side strip with a flange;

[0014] S7, blanking: the side strip with a flange is cut off from the connecting area based on the positioning hole.

[0015] Specifically, the processing unit range includes a connecting area in the middle and two processing areas on both sides of the connecting area, and the two processing areas are arranged on both sides of the connecting area in a top-to-top manner and are 180° center-symmetrically arranged.

[0016] Specifically, the bending step is completed in two steps, the first step is 45° bending, and the second step is 90° bending.

[0017] Specifically, the trimming step and the hole cutting step are completed in the same working step.

[0018] Specifically, the hole cutting step and the blanking step are further provided with a shaping step, which chamfers the inner edge of the annular part and the inner edge of the through hole.

[0019] The beneficial effects of the technical scheme of the present application are:

[0020] Before bending, the reinforcing part is reserved at the opposite position of the folding part, so as to prolong the force arm against the bending force, weaken the deformation amount of the flat part during bending, and make the stress of the flat part in the range of elastic deformation, so as to ensure the circularity of the annular part. Finally, the reinforcing part is removed, so that the profile structure of the side belt folding part meets the design requirements. The structure of the reinforcing part not only prolongs the force arm, but also uses the structural rigidity of the tab part itself to stretch the material, so as to further disperse the bending stress and reduce the influence of local deformation. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic view of a structural part;

[0022] Figure 2 is a material belt change diagram;

[0023] Figure 3 is Figure 2 is a local enlarged view of position A.

[0024] In the figure, the mark is:

[0025] 1-side belt folding part, 11-annular part, 12-flat part, 121-folding part, 13-tab part, 131-long convex, 132-through hole;

[0026] 2-material belt,

[0027] 21-connection area, 211-positioning hole;

[0028] 22-processing area, 220-billet, 221-process hole, 222-protruding part, 223-reinforcing part, 224-annular preformed part. DETAILED DESCRIPTION

[0029] The present application will be further described in detail below in combination with specific embodiments.

[0030] Embodiment:

[0031] As Figures 1 to 3As shown, the continuous stamping method for forming a side belt folding piece protruding part 1 of the present application includes a ring-shaped part 11, a flat piece part 12 and a protruding piece part 13 connected in sequence, the protruding piece part 13 has a long protruding bump 131 extending along the length direction thereof, the flat piece part 12 is provided with a 90° folded piece part on one side thereof, and the protruding piece part 13 is provided with a through hole 132 at the end away from the ring-shaped part 11; the steps include:

[0032] S1, punching positioning holes: the processing unit range includes the connecting area 21 in the middle and two processing areas 22 located on both sides of the connecting area 21, and the two processing areas 22 are arranged on both sides of the connecting area 21 in a top-to-top manner and are 180° center-symmetrically structured. With the first end and both sides of the material belt 2 as the positioning, the positioning holes 211 are punched out in the range of the connecting area 21, and the process holes 221 are punched out in the processing areas 22, the process holes 221 correspond to the inner holes of the ring-shaped part 11, and the diameter of the process holes 221 is smaller than the inner diameter of the ring-shaped part 11.

[0033] The positioning holes 211 and the process holes 221 serve as the positioning basis for subsequent processing steps, wherein the positioning holes 211 are outside the product area, and the process holes 221 are inside the product area. Because there is a hollow in the middle of the ring-shaped part 11 in the side belt folding piece protruding part 1, the process holes 221 are arranged at the hollow position, but considering the deformation of the material during processing, the process holes 221 have a processing allowance relative to the ring-shaped part 11, so the process holes 221 are appropriately smaller than the inner diameter of the ring-shaped part 11. After the process holes 221 complete their positioning function, the processing allowance is cut off. The layout mode of two processing areas 22 can produce two products at a time, and the production efficiency is relatively high. However, in order to prevent the connecting area 21 from being twisted and deformed, the two processing areas 22 are arranged on both sides of the connecting area 21 in a top-to-top manner, which can balance the left and right directional forces on both sides of the connecting area 21 and avoid the directional deviation of the connecting area 21.

[0034] In theory, the processing unit range can also only include one processing area 22, so that only single-piece products are obtained by stamping each time, and the production efficiency and material belt utilization rate are not as high as in this embodiment, but the implementation is not affected.

[0035] S2, protrusion: the long protruding bump 131 is punched out at the center of the processing area 22 based on the positioning holes 211 and the process holes 221.

[0036] The long protruding bump 131 is the main strength supporting structure in the side belt folding piece protruding part 1, and the material in this part will protrude to one side during forming, causing the surrounding material to shrink and deform. If the edge cutting is performed first, the product contour will not be accurate, so the protrusion step is performed before the edge cutting.

[0037] S3, pre-cutting: cutting off the waste material outside the processing area 22 based on the positioning hole 211 and the process hole 221, to obtain a blank 220, the blank 220 has a protruding part 222, a reinforcing part 223, an annular preforming part 224, a flat sheet part 12 and a tab part 13, the annular preforming part 224 corresponds to the annular part 11, the tab part 13 is connected to one side of the flat sheet part 12, and the reinforcing part 223 is connected to the other side of the flat sheet part 12 and extends from the opposite position of the tab part 13 to one side of the tab part 13.

[0038] The blank 220 is a preforming structure for the entire side strap flange punch part 1, except that a reinforcing part 223 is intentionally added at the opposite position of the bending, and a processing allowance is left on the inside of the annular part 11. The protruding part 222 is a preforming structure before the flange part 121 is bent. The annular preforming part 224 is a preforming structure of the annular part 11 before the inner hole is processed. The design idea of the present application is that before bending, a reinforcing part 223 is reserved at the opposite position of the flange part 121, thereby lengthening the force arm against the bending force, thereby reducing the deformation amount of the flat sheet part 12 when bending, so that the stress of the flat sheet part 12 is within the range of elastic deformation, thereby ensuring the true circularity of the annular part 11; and finally removing the reinforcing part 223, so that the profile structure of the side strap flange punch part 1 meets the design requirements. The structure of the reinforcing part 223 not only lengthens the force arm, but also uses the structural rigidity of the tab part 13 itself to stretch the material, so that the bending stress is further dispersed and the influence of local deformation is reduced.

[0039] S4, bending: folding the protruding part 222 down 90° to the flange part 121 based on the positioning hole 211 and the process hole 221.

[0040] With the assistance of the reinforcing part 223, the forming of the flange part 121 can avoid plastic deformation of the flat sheet part 12 connected thereto. In order to avoid one-step punching that breaks the protruding part 222, the bending step is generally completed in two working steps, the first working step is 45° bending, and the second working step is 90° bending.

[0041] S5, trimming: cutting off the reinforcing part 223 based on the positioning hole 211 and the process hole 221.

[0042] S6, hole cutting: cutting off the waste material inside the annular preforming part 224 based on the positioning hole 211, to obtain the annular part 11, and cutting a through hole 132 on the tab part 13, to obtain the side strap flange punch part 1.

[0043] After the bending step, the blank 220 no longer deforms in the horizontal direction, so some excess waste material can be cut off at this time (all of the reinforcing portion 223, the hole waste material inside the through hole 132, and the machining allowance inside the annular portion 11). Because the reinforcing portion 223 is spaced apart from the other two places of waste material, the three cutting dies do not interfere with each other, so the trimming step and the hole cutting step can be combined into the same working step after process optimization. The final result is the side strap tab punch part 1 that is still connected to the connecting area 21.

[0044] S7, blanking: the side strap tab punch part 1 is cut from the connecting area 21 with the positioning hole 211 as a reference.

[0045] After the above processing is completed, the side strap tab punch part 1 can be disconnected from the connecting area 21, the connecting area 21 is cut off, and the side strap tab punch part 1 will fall into the product collection box.

[0046] Because burrs exist on the inner edge of the annular portion 11 and the inner edge of the through hole 132 when the hole is cut, which will affect assembly, the hole cutting step and the blanking step generally also have a shaping step, which chamfers the inner edge of the annular portion 11 and the inner edge of the through hole 132. In this way, the burrs will be collapsed back, avoiding the hole edge from being raised.

[0047] The above is only some embodiments of the present application. For those of ordinary skill in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of protection of the present application.

Claims

1. A continuous stamping method for forming a side-flared convex part, the structure of which includes an annular part, a flat part and a convex part connected in sequence, the convex part having a long convex bulge extending along its length direction, the flat part having a 90° folded convex part on one side, and the convex part having a through hole at the end away from the annular part. Its features The steps include: S1. Punching positioning holes: The processing unit range includes a connection area and a processing area in the design. The first end and both sides of the strip are used as positioning. Positioning holes are punched in the connection area, and process holes are punched in the processing area. The process holes correspond to the inner hole of the annular part and the diameter of the process holes is smaller than the inner diameter of the annular part. S2. Embossing: Using the positioning hole and the process hole as references, punch out the long embossed bulge at the center of the processing area; S3. Pre-cutting: Using the positioning hole and the process hole as a reference, the waste material around the processing area is removed to obtain a blank. The blank has a protrusion, a reinforcing part, an annular pre-formed part, the flat part, and the convex part. The annular pre-formed part corresponds to the annular part. The protrusion is connected to one side of the flat part. The reinforcing part is connected to the other side of the flat part and extends from the relative position of the protrusion to one side of the convex part. S4. Bending: Using the positioning hole and the process hole as references, fold the protrusion downwards at 90° to form the folded part; S5. Trimming: Using the positioning hole and the process hole as references, cut off the reinforcing part; S6. Cutting holes: Using the positioning hole as a reference, cut off the waste material inside the annular preform to obtain the annular part, and at the same time cut the through hole on the protruding part to obtain the side-band folded protruding part. S7. Blanking: Using the positioning hole as a reference, cut the side-mounted flap protrusion from the connecting area.

2. The continuous stamping method for side-mounted convex parts according to claim 1, characterized in that: The processing unit is designed to include a central connecting area and two processing areas located on either side of the connecting area. The two processing areas are positioned opposite each other on either side of the connecting area and are 180° centrally symmetrical.

3. The continuous stamping method for side-mounted convex parts according to claim 1, characterized in that: The bending process is completed in two steps: the first step involves a 45° bend, and the second step involves a 90° bend.

4. The continuous stamping method for side-mounted convex parts according to claim 1, characterized in that: The trimming step and the hole-cutting step are completed in the same process step.

5. The continuous stamping method for side-mounted convex parts according to claim 1, characterized in that: Between the hole-cutting step and the blanking step, there is a shaping step, in which the inner edge of the annular portion and the inner edge of the through hole are chamfered.

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