Multi-pass stamping process for forming the external cross beam of a vehicle

Abstract

The invention discloses a multi-step stamping processing and forming process for an external cross beam for a vehicle. The process gradually stamps and forms a workpiece by reasonably setting multiple working procedures, thereby reducing the deformation of the workpiece in each stamping process. The positioning hole is first punched into a small hole and then expanded. This not only meets the positioning requirements of the multi-step processing, but also prevents the hole from being deformed and cracked due to excessive size during the stamping process. First, the edges of both sides of the convex block portion on the bottom surface extension portion of the workpiece close to the top surface are formed in two steps, and then the whole portion is formed, so that the part is accurately formed and the deformation of the S-shaped edge bending portion at a close distance is avoided, thereby ensuring the forming accuracy. The end portion residual material punching is carried out in two steps to avoid deformation of the workpiece and ensure the quality of the workpiece. At the same time, the space occupied by the punching component can be reduced to adapt to a machine with small specifications and reduce the equipment cost. The convex hole portion is first punched and then punched to avoid cracking of the hole caused by direct punching.

Description

Technical Field

[0001] The invention relates to a multi-pass stamping forming process for an external cross beam for a vehicle. Background Art

[0002] External beams for vehicles Figure 1 , 2 As shown, there are two left-right symmetrical workpieces, and the raised part on the top surface of the workpiece is densely provided with punching holes to be processed, the flanging line of the extended part is S-shaped, the bending depth in the inclined area of ​​the end is large, and the diameter of the positioning hole is large. The overall curved surface of the product is complex and it is easy to crack during the stamping process. During the flanging process of the product, the parts are pulled to both sides, causing the positioning holes to deform beyond the tolerance. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a multi-pass stamping process for forming a vehicle external cross beam with reliable finished product quality and high precision.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a multi-pass stamping process for forming an external cross beam for a vehicle, the steps of which are: step 1, using a blanking die to stamp and blank a plate to obtain a workpiece raw material plate;

[0005] Step 2: Use the first stamping die to stamp the workpiece raw material plate, preliminarily stamp out the top area of ​​the workpiece and the inclined areas at both ends, and preliminarily stamp out the convex part, positioning convex hole part, and straight groove of the top area, and perform the first molding on the side of the top surface extension part of the workpiece, and at the same time, stamp out a small convex hole part on the top surface extension part;

[0006] Step 3: Use a two-stage stamping die to stamp the sheet after the initial stamping, further stamp and shape the top area of ​​the workpiece and the inclined areas at both ends, and further shape the side of the extended portion of the top surface of the workpiece;

[0007] Step 4: Use a trimming stamping die to stamp the sheet after the second stamping, preliminarily cut off the excess material of the workpiece, punch a small positioning hole smaller than the diameter of the finished product in the positioning convex hole, punch a flange notch extending to the corresponding top surface of the workpiece on the side of the middle position of the left and right workpieces away from the extension part, and punch an inner concave notch on the side of the middle position of the left and right workpieces close to the extension part;

[0008] Step 5: Use a flanging stamping die to stamp the sheet after trimming and stamping, perform flanging forming on both sides of the workpiece, and integrally form the top surface extension of the workpiece, and integrally form the groove portion next to the top surface extension of the workpiece;

[0009] Step 6: Use the back-end stamping die to stamp the material plate, punch the extended part of the top surface of the workpiece, punch the side punching holes to be processed on the side of the workpiece, and trim the end of the inclined part of the workpiece;

[0010] Step seven: Use the final stamping die to stamp the material plate, punch out the finished product positioning hole in the positioning convex hole, cut off the corner material at the end of the inclined part of the workpiece, and cut off the connection between the left and right workpieces to separate the left and right parts.

[0011] As a preferred solution, in step six, when the material plate is stamped using a post-stamping die, two punched holes to be processed are punched on the groove portion of the workpiece.

[0012] As a preferred solution, in step seven, when the material plate is punched using a final punching die, unprocessed punched holes remain on the raised portion of the top area of ​​the punched workpiece.

[0013] As a preferred solution, in step four, a trimming stamping die is used to stamp the material plate after two stamping steps, and a flange notch extending to the corresponding top surface position of the workpiece is punched on the side of the middle position of the left and right workpieces away from the extension part, and an inward concave notch is punched on the side of the middle position of the left and right workpieces close to the extension part.

[0014] The beneficial effects of the present invention are:

[0015] The method gradually stamps and forms the workpiece by reasonably setting multiple working procedures, thereby reducing the deformation of the workpiece in each stamping process, and the positioning hole is first punched as a small hole and then expanded at the end, which not only meets the positioning requirements of multi-process processing, but also prevents the hole mouth from being deformed and cracked due to excessive deformation during the stamping process; the side surface of the extension part of the top surface of the workpiece is first formed in two steps, and then the whole part is formed, so that the part is accurately formed and the deformation of the S-shaped edge bending part at a close distance is avoided, thereby ensuring the forming accuracy; the end excess material is punched and cut in two steps to avoid deformation of the workpiece and ensure the quality of the workpiece. At the same time, the space occupied by the punching and cutting components can be reduced to adapt to machines with small specifications, thereby reducing equipment costs; the convex hole part is first punched and then punched to avoid cracking of the hole mouth caused by direct punching.

[0016] In the step 4, a trimming stamping die is used to stamp the material plate after the second stamping. A flange notch extending to the corresponding top surface of the workpiece is punched on the side of the middle position of the left and right workpieces away from the extension part, and an inward concave notch is punched on the side of the middle position of the left and right workpieces close to the extension part to facilitate subsequent punching and cutting to avoid cracking during punching and cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the main structure of the vehicle external cross beam of the present invention.

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure of the vehicle external cross beam of the present invention.

[0019] Figure 3 It is a schematic diagram of the workpiece after processing in step 2 of the present invention.

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

[0021] Figure 5 It is a schematic diagram of the workpiece after processing in step 4 of the present invention.

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

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

[0024] In the figure: 1 top area of ​​the workpiece, 2 inclined area, 3 raised portion, 4 positioning convex hole portion, 5 straight groove, 6 top surface extension portion, 7 small convex block portion, 8 flange notch, 9 inner concave notch, 10 groove portion, 11 corner material. DETAILED DESCRIPTION

[0025] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] like Figure 1-7 As shown, a multi-pass stamping process for forming an external cross beam for a vehicle comprises the following steps: Step 1, using a blanking die to stamp and blank a plate to obtain a workpiece raw material plate;

[0027] Step 2: Use the first stamping die to stamp the workpiece raw material plate, preliminarily stamp out the top area 1 of the workpiece and the inclined areas 2 at both ends, and preliminarily stamp out the convex portion 3, the positioning convex hole portion 4, and the straight groove 5 in the top area, and perform the first molding on the side of the top surface extension portion 6 of the workpiece, and at the same time, stamp out a small convex hole portion on the top surface extension portion 6;

[0028] Step 3: Use a two-stage stamping die to stamp the sheet after the preliminary stamping, further stamp and shape the top area 1 of the workpiece and the inclined areas 2 at both ends, and further shape the side of the extension part 6 of the top surface of the workpiece;

[0029] Step 4: Use a trimming stamping die to stamp the sheet after the second stamping, preliminarily cut off the excess material of the workpiece, and punch a small positioning hole smaller than the diameter of the finished product in the positioning convex hole portion 4, and punch a flange notch 8 extending to the corresponding position of the top surface of the workpiece on the side of the middle position of the left and right workpieces away from the extension portion, and punch an inner concave notch 9 on the side of the middle position of the left and right workpieces close to the extension portion;

[0030] Step 5: Use a flanging stamping die to stamp the sheet after trimming and stamping, perform flanging forming on both sides of the workpiece, and integrally form the top surface extension portion 6 of the workpiece, and integrally form the groove portion 10 next to the top surface extension portion 6 on the workpiece;

[0031] Step 6: Use the back-end stamping die to stamp the material plate, punch the extension part 6 on the top surface of the workpiece, punch the side punching holes to be processed on the side of the workpiece, trim the end of the inclined part of the workpiece, and punch the two upper punching holes to be processed on the groove part 10 of the workpiece;

[0032] Step seven: Use the final stamping die to stamp the material plate, punch out the finished product positioning hole in the positioning convex hole part 4, punch out the remaining unprocessed punching hole on the convex part of the top area of ​​the workpiece, cut off the corner material 11 at the end of the inclined part of the workpiece, and cut off the connection part of the left and right workpieces to separate the left and right parts.

[0033] The above-mentioned embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A multi-pass stamping process for an external cross beam for a vehicle, the steps of which are as follows: Step 1, stamping and blanking a plate using a blanking die to obtain a workpiece raw material plate; Step 2: Use the first stamping die to stamp the workpiece raw material plate, preliminarily stamp out the top area of ​​the workpiece and the inclined areas at both ends, and preliminarily stamp out the convex part, positioning convex hole part, and straight groove of the top area, and perform the first molding on the side of the top surface extension part of the workpiece, and at the same time, stamp out a small convex hole part on the top surface extension part; Step 3: Use a two-stage stamping die to stamp the sheet after the initial stamping, further stamp and shape the top area of ​​the workpiece and the inclined areas at both ends, and further shape the side of the extended portion of the top surface of the workpiece; Step 4: Use a trimming stamping die to stamp the sheet after the second stamping, preliminarily cut off the excess material of the workpiece, punch a small positioning hole smaller than the diameter of the finished product in the positioning convex hole, punch a flange notch extending to the corresponding top surface of the workpiece on the side of the middle position of the left and right workpieces away from the extension part, and punch an inner concave notch on the side of the middle position of the left and right workpieces close to the extension part; Step 5: Use a flanging stamping die to stamp the sheet after trimming and stamping, perform flanging forming on both sides of the workpiece, and integrally form the top surface extension of the workpiece, and integrally form the groove portion next to the top surface extension of the workpiece; Step 6: Use the back-end stamping die to stamp the material plate, punch the extended part of the top surface of the workpiece, punch the side punching holes to be processed on the side of the workpiece, and trim the end of the inclined part of the workpiece; Step seven: Use the final stamping die to stamp the material plate, punch out the finished product positioning hole in the positioning convex hole, cut off the corner material at the end of the inclined part of the workpiece, and cut off the connection between the left and right workpieces to separate the left and right parts.

2. A multi-pass stamping process for forming an external cross beam for a vehicle as claimed in claim 1, characterized in that: In the step six, when the material plate is punched using the subsequent punching die, two punching holes to be processed are punched on the groove portion of the workpiece.

3. A multi-pass stamping process for forming an external cross beam for a vehicle as claimed in claim 2, characterized in that: In the step seven, when the material plate is punched using the final punching die, unprocessed punched holes remain on the raised portion of the top area of ​​the punched workpiece.

Images