Automobile outer plate processing technic method

A processing technology, automobile technology, applied in the field of automobile outer panel processing technology, can solve the problems of springback, stamping cracking, and surface inequality

Inactive Publication Date: 2013-12-04
YESUN SHANGHAI MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to solve the proble...

Method used

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  • Automobile outer plate processing technic method
  • Automobile outer plate processing technic method
  • Automobile outer plate processing technic method

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Aiming at the contradictory situation of eliminating the drawing cracking and insufficient thinning of the outer panel for the automobile roof, such as Figure 4 As shown, the present invention processes the process supplementary surface of the top cover, and it can be seen that the angle between the slope of the process surface and the binder surface is much smaller, and the binder surface is also different.

[0029] According to the situation in the drawing process in the past, the method of reducing the angle of the inclined plane is adopted. This method greatly improves the cracking phenomenon of the inclined plane and meets the qualified requirements. and for image 3 In the middle A area, the thinning rate of this area is less than 4%. For this case, the prior art adopts to increase the local drawbead coefficient in this area. However, due to the characteristics of the material itself, if only increasing the drawbead coefficient here can not meet the thinning ra...

Embodiment 2

[0033] Aiming at the defects of springback in the molding process of the outer panel of the automobile hood, such as Figure 7 As shown, the circled part of the windshield protrudes upwards and rebounds, and the rebound exceeds 4mm. In the face of such a shape of rebound, use a wave-shaped flanging knife block to improve it.

[0034] Such as Figure 8 As shown in the figure, the wavy cutter block is used for flanging the outer panel of the machine cover, and the middle of the cutter block contacts the sheet material 20mm earlier than the two ends, so that the material in the middle is deformed first, and the deformation of the middle material is more sufficient due to the large contact of the cutter block , using such a shape of the flanging knife block for the flanging process can effectively reduce the springback at the windshield.

[0035] Further, when the wave flanging knife is still not enough to make the rebound at this place meet the requirements, the following techn...

Embodiment 3

[0039] Aiming at the defect that the outer surface of the outer panel of the automobile hood is easily corrugated after flanging, by comparing the state of the defect in the whole process, it can be known that the corrugation is generated in the flanging process, and the direct cause of the defect is that when the flanging The internal stress of the material is unstable and the change is uneven.

[0040] For corrugation due to material instability, the pressure and gap of the pressing core during the flanging process are changed. Partially reduce the gap of the pressing core near the flanging by 0.1-0.2 times the material thickness, so that the corrugated area may be in a local strong pressure state, increase the material thickness pressure and reduce its fluctuation.

[0041] For the instability of the outer surface to produce ripples, uneven changes are formed on the outer surface due to the stress and strain generated by the change of the flanging material. Reduce the corn...

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Abstract

The invention relates to the field of punching of automobile outer covering pieces, in particular to an automobile outer plate processing technic method. An addendum surface in a drawing process is adopted; the inclination degree of the inclined plane of the addendum surface is an included angle of 30-45 degrees between the inclined plane and a binder surface; and the height of the binder surface is adjusted, so that areas of different drawing depths in the same inclined plane are stressed uniformly, the requirement of thinning rate of an outer surface is met, and peripheral inclined planes are prevented from cracking by drawing. The method is mainly used for overcoming the defects of great rebounding force, outer surface unevenness and the like caused by insufficient rigidity of the outer surface and cracking and arc-shaped flanges on side walls. The abovementioned defects are improved and overcome by methods including changing the height of the binder surface, adopting an excessive drawing form, setting the inclination and form of a process surface, and the like.

Description

technical field [0001] The invention relates to the stamping field of an automobile outer cover, in particular to a processing method for an automobile outer panel. Background technique [0002] With the rapid development of the domestic automobile industry and the continuous increase of automobile models, for outer panels (including automobile roofs such as figure 1 As shown, the car hood is as Figure 7 Shown) the surface quality requirements are getting higher and higher. [0003] Such as figure 1 As shown, it is a workpiece surface of a car roof, and the biaxial tensile coefficient of the material is biax=1.2. Its characteristic is that the material has the same principal and secondary strain directions, and the yield strength will increase when the values ​​are close, and the yield strength will decrease when the direction is opposite. Due to this characteristic, the risk of material cracking in the drawing process is greater. [0004] Such as figure 2 As shown, i...

Claims

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Application Information

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IPC IPC(8): B21D35/00
Inventor 李正张正发张宇
Owner YESUN SHANGHAI MOLD
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