Multi-stage stamping forming process for the automotive spring rocker arm housing

Abstract

The present invention discloses a multi-stage stamping forming process for an automotive spring rocker arm housing with relatively low cost. First, a blanking die is used to stamp and blank the sheet material, and extension parts are respectively provided at positions corresponding to both ends close to the finished workpiece. A notch with a width greater than the width of the top surface of the finished workpiece at this end is punched on the extension part. Then, the rocker arm outer shape is initially stamped and formed, and a whole convex bulge is stamped in the middle. Next, the surplus materials on both sides of the blank are initially cut and trimmed. A middle sunken concave hole is punched on the whole convex bulge in the middle of the workpiece. Then, the workpiece is integrally stamped and shaped, and all the surplus materials on both side edges are cut off. The two L-shaped surplus materials at the short end of the workpiece are cut off, and side punching is carried out on the end part of the side wall of the long end of the other workpiece at the same time. Finally, the remaining L-shaped surplus materials at the long end of the workpiece are cut off, and side punching is carried out on the end part of the side wall of the long end of the other workpiece at the same time.

Description

Technical Field

[0001] The invention relates to a multi-stage stamping process for an automobile spring rocker arm housing. Background Art

[0002] Automobile spring rocker arm housing Figure 1 As shown, there is a convex bulge in the middle, and a downward recessed portion is provided in the convex bulge. One end of the extended sections at both ends is long and narrow, and the other end is wide and short. The side walls of the two end portions are slightly extended compared to the top wall and are provided with side punching holes. The overall curved surface is relatively complex, and deformation is easy to occur during processing, and the size is not easy to control. In the existing stamping process, the recessed area in the middle of the central convex bulge needs to be punched into a shallow and wide recessed area first, and then multiple shrinking stampings are used to gradually obtain a deeper and narrower recessed portion that meets the requirements. This results in more stamping steps, greatly increases the mold cost and the punched finished product cost, and makes the production cost of a single piece high. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a low-cost multi-stage stamping process for an automobile spring rocker arm housing.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] The multi-stage stamping process for an automobile spring rocker arm housing includes the following steps: Step 1: Using a blanking die to stamp and blank a plate to obtain a workpiece raw material plate, and providing an extension portion near each end of the finished workpiece, wherein a notch having a width greater than the width of the top surface of the finished workpiece at the end is punched on the extension portion;

[0006] Step 2: Use the first stamping die to stamp the workpiece raw material plate, initially stamping out the rocker arm shape, and stamping the middle part into an integral convex hull;

[0007] Step 3: Use a trimming and punching die to punch the workpiece, perform initial trimming on the excess material on both sides of the workpiece, punch through cuts along the length direction on the top surface outside the notches at both ends of the workpiece, and punch set long holes at both ends of the overall convex hull on the workpiece;

[0008] Step 4: Use a preliminary shaping die to perform shaping and stamping processing on the side surfaces of both ends of the workpiece, and punch a sunken hole in the middle of the overall convex hull in the middle of the workpiece;

[0009] Step 5: Use a shaping and trimming die to stamp and shape the workpiece as a whole, and remove all excess material on both sides of the edge;

[0010] Step 6: Use the subsequent stamping die to cut the two L-shaped leftovers at the short end of the workpiece, punch the two through holes on the top surface of the long end of the workpiece, the through holes on the convex boss and the through holes in the sunken concave hole in the middle of the convex boss, cut the L-shaped leftover on one side of the long end of the workpiece and simultaneously perform side punching on the end of the side wall of the other long end of the workpiece, and perform side punching on both sides of the workpiece where the convex boss is close to the short end;

[0011] Step 7: Use the final stamping die to cut the remaining L-shaped leftover at the long end of the workpiece and simultaneously perform side punching on the end of the side wall of the other long end of the workpiece, punch the pair of positioning holes on the top surface of the workpiece and the pair of through holes near the short end of the bottom surface of the workpiece, and perform side punching on both sides of the short end of the workpiece to obtain the finished rocker arm.

[0012] As a preferred solution, there is a leftover of not less than 30 mm on the workpiece raw material plate obtained in Step 1 corresponding to the long end of the workpiece.

[0013] As a preferred solution, in Step 1, a notch larger than the width of the top surface of the finished product at this end is respectively punched at both ends of the workpiece raw material plate corresponding to the finished workpiece, and the dimension of the notch along the length direction of the workpiece is not less than 12 mm.

[0014] As a preferred solution, on the workpiece raw material plate obtained in Step 1, a concave notch with the same width as the long hole in this area of the workpiece finished product is provided on the edge close to the short end of the notch punched at the short end of the workpiece finished product.

[0015] As a preferred solution, on the workpiece raw material plate obtained in Step 1, the width of the extended leftover at the end of the notch corresponding to the long end of the workpiece away from the center of the workpiece is greater than the width of the top surface of the long end of the workpiece finished product and less than the sum of the width of the top surface of the long end of the workpiece finished product and the widths of both side surfaces.

[0016] The beneficial effects of the present invention are as follows: In step one, a notch larger than the width of the top surface of the finished workpiece at both ends is punched respectively, so that after stamping in step two, there are bending sections at the ends of the workpiece, enhancing the strength of the ends and avoiding uncontrollable deformation of the ends during subsequent stamping, which affects the processing accuracy; the top surface parts outside the notches at both ends of the workpiece are punched with through cuts along the length direction, making subsequent cutting easy to operate and meeting the strength requirements of the ends at the same time; for the middle part of the workpiece, the processing method of first bulging and then punching a groove is adopted, replacing the traditional shrinking process that requires multiple processes to form, greatly saving the stamping process and reducing the production cost; in step three, a trimming and punching die is used for primary trimming processing, which can avoid excessive deformation of the remaining material part driving the workpiece to deform excessively due to excessive remaining material during subsequent processing; in step five, a shaping trimming die is used to perform overall stamping and shaping on the workpiece and cut off all the remaining materials on both sides, ensuring the reliability of the workpiece forming and avoiding dimensional deviation of the workpiece caused by springback deformation after stamping; in step six, the L-shaped remaining material on one side of the long end of the workpiece is cut off, and at the same time, side punching is performed on the end of the side wall of the long end of the other workpiece, and side punching is performed on both sides of the workpiece near the short end of the convex hull; and in step seven, the remaining L-shaped remaining material at the long end of the workpiece is cut off by using the final stamping die, and at the same time, side punching is performed on the end of the side wall of the long end of the other workpiece, avoiding excessive deformation of the workpiece during the processing; finally, the processing technology can obtain a reliable-sized and low-cost rocker arm finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of an automotive spring rocker arm housing.

[0018] Figure 2 is a schematic diagram of the workpiece after processing in step one of the present invention

[0019] Figure 3 is a schematic diagram of the workpiece after processing in step two of the present invention

[0020] Figure 4 is a schematic diagram of the workpiece after processing in step three of the present invention

[0021] Figure 5 is a schematic diagram of the workpiece after processing in step four of the present invention

[0022] Figure 6 is a schematic diagram of the workpiece after processing in step five of the present invention

[0023] Figure 7 is a schematic diagram of the workpiece after processing in step six of the present invention.

[0024] In the figure: 1 extension part, 2 long end of the workpiece, 3 notch, 4 short end of the workpiece, 5 overall convex hull, 6 cut, 7 sunken hole, 8 L-shaped remaining material, 9 L-shaped remaining material, 10 L-shaped remaining material, 11 positioning hole. Detailed implementation mode

[0025] The following combines the accompanying drawings to describe in detail the specific implementation plan of the present invention.

[0026] As Figure 1-7 shown, the multi-stage stamping forming process of the automotive spring rocker arm housing includes the following steps: Step 1: Use a blanking die to stamp and blank the sheet metal to obtain a workpiece raw material plate. Extension parts 1 are respectively provided at positions corresponding to the two ends of the workpiece near the finished product, and a surplus material of not less than 30 mm is left on the workpiece raw material plate corresponding to the long end 2 of the workpiece; A notch 3 with a width greater than the width of the top surface of the finished product at this end is punched on the extension part 1, and the dimension of the notch 3 along the length direction of the workpiece is not less than 12 mm; The width of the surplus material of the extension part 1 at the end of the notch 3 away from the workpiece center corresponding to the long end 2 of the workpiece on the workpiece raw material plate is greater than the width of the top surface of the long end of the workpiece finished product and less than the sum of the width of the top surface of the long end of the workpiece finished product and the widths of the two side surfaces. An inner concave notch with the same width as the long hole in this area on the workpiece finished product is provided on the edge of the notch 3 punched on the workpiece raw material plate corresponding to the short end of the workpiece finished product near the short end 4 of the workpiece;

[0027] Step 2: Use the first-stage stamping die to stamp and process the workpiece raw material plate, initially stamping and forming the rocker arm shape, and stamping a whole convex bulge 5 in the middle;

[0028] Step 3: Use a trimming and punching die to stamp and process the workpiece, initially cut and trim the surplus materials on both sides of the workpiece, punch a through incision 6 along the length direction on the top surface part outside the notch 3 at both ends of the workpiece, and punch set long holes at both ends of the whole convex bulge 5 on the workpiece;

[0029] Step 4: Use a preliminary shaping die to perform shaping stamping on the side surfaces of both ends of the workpiece, and punch a middle sunken concave hole 7 on the whole convex bulge 5 in the middle of the workpiece;

[0030] Step 5: Use a shaping and trimming die to perform overall stamping and shaping on the workpiece, and cut off all the surplus materials on both side edges;

[0031] Step 6: Use a post-stage stamping die to cut off the two L-shaped surplus materials 8 at the short end 4 of the workpiece, punch the through holes on the top surface of the long end 2 of the workpiece, the through holes on the convex bulge, and the through holes in the middle sunken concave hole 7 in the convex bulge, cut off the L-shaped surplus material 9 on one side of the long end 2 of the workpiece and perform side punching on the end of the side wall of the other side of the long end 2 of the workpiece, and perform side punching on both side surfaces of the workpiece located on the side of the convex bulge near the short end;

[0032] Step VII: Use the final stamping die to cut the remaining L-shaped surplus material 10 of the long end 2 of the workpiece, simultaneously perform side punching on the end of the side wall of the long end 2 of the other workpiece, punch a pair of positioning holes 11 on the top surface of the workpiece, punch a pair of through holes near the short end on the bottom surface of the workpiece, and perform side punching on both sides of the short end 4 of the workpiece to obtain the finished rocker arm.

[0033] The above embodiments are only illustrative of the principles and effects of the present invention and some applied embodiments, rather than limiting the present invention. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention.

Claims

1. A multi-stage stamping forming process for an automotive spring rocker arm housing, comprising the following steps: Step 1: Use a blanking die to stamp and blank the sheet metal to obtain a workpiece raw material plate, and extension parts are respectively provided at positions corresponding to the two ends of the workpiece near the finished product. A notch with a width greater than the width of the top surface of the finished product at this end is punched on the extension part. Step 2: Use a first-stage stamping die to stamp and process the workpiece raw material plate, initially stamping and forming the shape of the rocker arm, and stamping a whole convex bulge in the middle. Step 3: Use a trimming and punching die to stamp and process the workpiece, initially cutting and trimming the surplus materials on both sides of the workpiece, punching through cuts along the length direction on the top surface parts outside the notches at both ends of the workpiece, and punching set long holes at both ends of the whole convex bulge on the workpiece. Step 4: Use a preliminary shaping die to perform shaping stamping on the side surfaces of both ends of the workpiece, and punch a middle sunken concave hole on the whole convex bulge in the middle of the workpiece. Step 5: Use a shaping and trimming die to perform overall stamping and shaping on the workpiece, and cut off all the surplus materials on both side edges. Step 6: Use a post-stage stamping die to cut the two L-shaped surplus materials at the short end of the workpiece, punch the two through holes on the top surface of the long end of the workpiece, the through holes on the convex bulge and the through holes in the middle sunken concave hole in the convex bulge, cut the L-shaped surplus material on one side of the long end of the workpiece while performing side punching on the end part of the side wall on the other side of the long end of the workpiece, and perform side punching on both side surfaces of the workpiece at the side of the convex bulge near the short end. Step 7: Use a final stamping die to cut the remaining L-shaped surplus material at the long end of the workpiece while performing side punching on the end part of the side wall on the other side of the long end of the workpiece, punch a pair of positioning holes on the top surface of the workpiece and a pair of through holes near the short end on the bottom surface of the workpiece, and perform side punching on both sides of the short end of the workpiece to obtain the finished rocker arm.

2. The multi-stage stamping forming process of an automotive spring rocker arm housing according to claim 1, wherein: On the workpiece raw material plate obtained in Step 1, there is a surplus material of not less than 30 mm left at the position corresponding to the long end of the workpiece.

3. A multi-stage stamping forming process for an automotive spring rocker arm housing as described in claim 2, characterized in that: In Step 1, a notch with a width greater than the width of the top surface of the finished product at this end is respectively punched at positions corresponding to the two ends of the workpiece near the finished product, and the dimension of the notch along the length direction of the workpiece is not less than 12 mm.

4. The multi-stage stamping forming process of an automotive spring rocker arm housing according to claim 3, characterized in that: On the workpiece raw material plate in Step 1, an inner concave notch with the same width as the long hole in this area on the workpiece finished product is provided on the edge of the notch near the short end at the position corresponding to the short end of the workpiece finished product.

5. A multi-stage stamping forming process for an automotive spring rocker arm housing as claimed in claim 4, characterized in that: On the workpiece raw material plate obtained in Step 1, the width of the surplus material of the extension part at the end of the notch away from the center of the workpiece at the position corresponding to the long end of the workpiece is greater than the width of the top surface of the long end of the workpiece finished product and less than the sum of the width of the top surface of the long end of the workpiece finished product and the widths of the two side surfaces.

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