Stamping process for a front beam of a vehicle

Abstract

The application discloses a stamping forming process of an automobile front beam. The process rationally distributes stamping deformation steps to form a workpiece, avoids part deformation and cracking, and greatly improves the yield of finished products. Through preliminary stamping, the material on the outer side of the convex bump is allowed to flow freely, good material supplementing effect is formed, the convex bump is prevented from cracking, the size of the convex bump is ensured, the side surface of the convex bump is matched with an eccentric piece, and cracks are prevented from occurring at the side surface bending part. The excess material at the inner side surface bending part is retained in the form of lugs, and the excess material on the inner side surface is cut off in distribution, so that cracks are prevented from occurring at the inner side surface bending part, and the quality of finished products is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to a plate stamping forming processing method, in particular to a stamping forming process of an automobile front beam. BACKGROUND

[0002] The automobile front beam is shaped as shown in the figure, both ends need to be processed C-shaped notches, the size accuracy of the notches is required, the middle part has an outwardly extending protruding part, and a pair of convexes are arranged on the protruding part, as shown in the figure, the cross section of the convex position, the inclination of the opposite sides of the two convexes is not greater than 10° and the diameter of the bottom transition fillet is not greater than 0.5mm, so that the two sides can well limit the eccentric piece on the matched part. The outer side edge of the workpiece needs to be upward flanging, the inner side of the workpiece needs to be downward flanging and the two wings are inwardly bent and contracted, the structure of the part is complex, and since the tensile strength of the material is 480-620MPa, stamping processing is prone to product cracking, resulting in scrap, especially the cracking rate of the convex bottom is higher. Figure 1 SUMMARY Figure 2 The technical problem to be solved by the present application is to provide a stamping forming process of an automobile front beam with high yield.

[0003] To solve the above technical problems, the technical scheme adopted by the present application is as follows: a stamping forming process of an automobile front beam, comprising the following steps:

[0004] Step one, a preliminary forming stamping die is used to preliminarily form a convex on the two convex extension parts of the saddle-shaped sheet, and a pair of first convexes are preliminarily formed on the convex, and the parts of the sheet corresponding to the inner side and the two wings are stamped into a preliminarily convex arc shape;

[0005] The end fillet diameter of the side surface of the first convex close to the center side of the convex is 2.5-3.5 times the end fillet diameter of the formed convex, the bottom fillet diameter of the side surface of the first convex close to the center side of the convex is greater than 6mm, the included angle between the side surface and the horizontal plane is 50-65°, and the distance between the two first convexes is not less than 2 / 3 of the distance between the finished convexes;

[0006] Step two, a two-stroke stamping die is used to further form the first convex to obtain a second convex, the end fillet diameter of the side surface of the second convex close to the center side of the convex is 1.2-1.5 times the end fillet diameter of the formed convex, the bottom fillet diameter of the side surface of the second convex close to the center side of the convex is 1.5-2.5mm, the included angle between the side surface and the vertical plane is 10-30°, and the distance between the two second convexes is not less than 4 / 5 of the distance between the finished convexes;

[0007] Step three, a flanging die is used to upward flange stamping on the outer side edge of the workpiece;

[0008] ​​

[0009] Step four, the inner side of the workpiece is initially stamped and bent downward by a stamping die, and the second convex bump is shaped into a finished convex bump by the stamping die; when stamping, the forming pressure of the upper die corresponding to the convex bump position is 1 / 5 of the forming pressure of the flat portion;

[0010] Step five, the lower part of the inner side of the workpiece is initially stamped and cut by a stamping die, and an arc-shaped lug opposite to the convex direction of the convex portion is pressed out at the wing side bending part;

[0011] Step six, the workpiece is punched by a die, and the middle section between the two arc-shaped lugs of the inner side of the workpiece is cut off;

[0012] Step seven, the remaining side edge material of the two end parts of the inner side of the workpiece is cut off by a punching die;

[0013] Step eight, the end part of the cutting die is cut off.

[0014] As a preferred scheme, after the end part of the cutting die is cut off in step eight, the workpiece is shaped by a shaping die to obtain a finished product.

[0015] As a preferred scheme, in step one, the preliminary forming stamping die stamps a circular arc-shaped reinforcing groove between the two convex portions of the workpiece.

[0016] As a preferred scheme, in step one, the preliminary forming stamping die simultaneously forms an avoidance groove beside the convex portion of the workpiece.

[0017] The beneficial effects of the present application are: the processing method rationally distributes the stamping deformation steps to form the workpiece, avoids part deformation and cracking, and greatly improves the processing yield. By stamping first, the material on the outer side of the convex bump is allowed to flow freely, forming a good material supplementing effect, avoiding cracking of the convex bump, while ensuring the size of the convex bump, so that the side surface cooperates with the eccentric piece, avoiding cracks at the side bending part; and the excess material on the inner side is retained as lugs, and the excess material on the inner side is cut off, ensuring that the inner side bending part will not crack, thereby ensuring the quality of the finished product. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a finished product structure diagram of an automobile front beam.

[0019] Figure 2 It is a cross-sectional structure diagram of the convex bump part of the finished product of the automobile front beam.

[0020] Figure 3 It is a schematic diagram of the shape of the workpiece after step one.

[0021] Figure 4 It is a schematic diagram of the shape of the workpiece after step two.

[0022] Figure 5 This is a schematic diagram of the workpiece shape after processing in step three.

[0023] Figure 6 This is a schematic diagram of the workpiece shape after processing in step four.

[0024] Figure 7 This is a schematic diagram of the workpiece shape after processing in step five.

[0025] Figure 8 This is a schematic diagram of the workpiece shape after processing in step six.

[0026] Figure 9 This is a schematic diagram of the workpiece shape after processing in step seven.

[0027] Figure 10 This is a schematic diagram of the workpiece shape after processing in step eight.

[0028] In the figure: 1. Protruding extension, 2. Boss, 3. Protruding bulge, 4. Reinforcing groove, 5. Clearance groove, 6. Outer side of workpiece, 7. Inner side of workpiece, 8. Wing, 9. Arc-shaped lug. Detailed Implementation

[0029] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0030] like Figures 1-10 As shown, a stamping process for a car front beam includes the following steps:

[0031] Step 1: Using a preliminary forming stamping die, initially form bosses 2 at the two protruding extensions 1 of the saddle-shaped sheet, and initially form a pair of first protrusions 3 on the bosses 2. At the same time, stamp the parts of the sheet corresponding to the inner side and the two wings into preliminary raised arc surfaces. The preliminary forming stamping die also stamps an arc-shaped reinforcing groove 4 and a clearance groove 5 next to the protruding extensions 1 between the two protruding extensions 1 on the workpiece.

[0032] The diameter of the rounded corner of the side end of the first convex 3 near the center of the boss 2 is 2.5-3.5 times that of the rounded corner of the end of the formed convex 3. The diameter of the rounded corner of the bottom of the side of the first convex 3 near the center of the boss 2 is greater than 6mm. The angle between the side and the horizontal plane is 50-65°. The distance between the two first convex 3 is not less than 2 / 3 of the distance between the finished convex 3.

[0033] Step two, the first convex 3 is further formed by a two-stroke stamping die to obtain a second convex 3, the side end of the second convex 3 near the center of the boss 2 is rounded with a diameter of 1.2-1.5 times of the end rounding of the formed convex 3, the side bottom of the second convex 3 near the center of the boss 2 is rounded with a diameter of 1.5-2.5mm, the angle between the side and the vertical surface is 10-30°, and the spacing between the two second convexes 3 is not less than 4 / 5 of the spacing of the finished convexes 3;

[0034] Step three, the outer side 6 of the workpiece is upwardly flanged by a flanging die;

[0035] Step four, the inner side 7 of the workpiece is initially stamped and bent downward by a stamping die, and the second convex 3 is shaped into a finished convex 3, and the forming pressure of the upper die corresponding to the position of the convex 3 is 1 / 5 of the forming pressure of the flat part during stamping;

[0036] Step five, the lower part of the inner side 7 of the workpiece is initially stamped and cut off by a stamping die, and an arc-shaped lug 9 opposite to the protruding direction of the protruding part 1 is pressed out at the side edge bending part of the wing part 8;

[0037] Step six, the workpiece is punched by a die, and the middle section between the two arc-shaped lugs 9 of the excess material on the inner side 7 of the workpiece is cut off;

[0038] Step seven, the excess material of the two end parts of the inner side 7 of the workpiece is cut off by a punching die;

[0039] Step eight, the end excess material is cut by an end punching die, and the workpiece is stamped and shaped by a shaping die to obtain a finished product.

[0040] The above embodiments only exemplarily illustrate the principles and effects of the present application, and part of the embodiments are used, but are not used to limit the present application; it should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application.

Claims

1. A stamping process for a front beam of an automobile, comprising the following steps: Step 1: Using a preliminary forming stamping die, preliminarily form bosses on the two protruding extensions of the saddle-shaped sheet, and preliminarily form a pair of first protrusions on the bosses. At the same time, stamp the parts of the sheet corresponding to the inner side and the two wings into a preliminary raised arc shape. The diameter of the rounded corner of the side end of the first convex bulge near the center of the boss is 2.5-3.5 times that of the rounded corner of the end of the formed convex bulge. The diameter of the rounded corner of the bottom side of the first convex bulge near the center of the boss is greater than 6mm. The angle between the side and the horizontal plane is 50-65°. The distance between the two first convex bulges is not less than 2 / 3 of the distance between the finished convex bulges. Step 2: The first convex bulge is further formed using a two-stage stamping die to obtain the second convex bulge. The diameter of the rounded corner of the side end of the second convex bulge near the center of the boss is 1.2-1.5 times that of the rounded corner of the end of the formed convex bulge. The diameter of the rounded corner of the bottom side of the second convex bulge near the center of the boss is 1.5-2.5mm. The angle between the side and the vertical plane is 10-30°. The distance between the two second convex bulges is not less than 4 / 5 of the distance between the finished convex bulges. Step 3: Use a flanging die to flanging and stamp the outer edge of the workpiece upwards; Step 4: The inner side of the workpiece is initially stamped and bent downwards using a stamping die, and the second convex bulge is shaped into a finished convex bulge using a stamping die. During stamping, the forming pressure of the upper die corresponding to the convex bulge position is 1 / 5 of the forming pressure of the flat part. Step 5: Use a stamping die to preliminarily stamp and remove excess material from the lower inner part of the workpiece, and press out an arc-shaped lug at the side bend of the wing part, which is opposite to the direction of the protrusion of the extension part. Step 6: Use a mold to punch holes in the workpiece, and at the same time cut off the middle section between the two arc-shaped lugs on the inner side of the workpiece. Step 7: Use a punching die to remove the remaining side material at both ends of the inner side of the workpiece; Step 8: Use an end-cutting die to cut off the excess material at both ends.

2. The stamping process for a front beam of an automobile as described in claim 1, characterized in that: In step eight, after the end punching die is used to punch off the excess material at both ends, a forming die is used to stamp and shape the workpiece to obtain the finished product.

3. The stamping process for an automobile front beam as described in claim 1, characterized in that: In step one, the preliminary forming stamping die stamps an arc-shaped reinforcing groove between the two protruding parts on the workpiece.

4. The stamping process for a front beam of an automobile as described in claim 1, characterized in that: In step one, the initial forming stamping die simultaneously forms the clearance groove next to the protruding extension on the workpiece.

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