Stamping and local hydraulic compound forming method suitable for large automobile covering parts

A technology of hydroforming of automobile panels, which is applied in the field of stamping and partial hydraulic composite forming applicable to large automobile panels, and can solve problems such as cracking or wrinkling, insufficient material fluidity, and high requirements for mold sealing. To achieve the effect of improving the shape

Active Publication Date: 2016-03-23
HUNAN UNIV
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Problems solved by technology

This method has high processing efficiency, but it is often prone to cracking or wrinkling when forming for local complex features
Hydroforming realizes the forming of sheet metal by using liquid as a force transmission medium, which can effectively improve the formability of aluminum-magnesium alloys, titanium alloys and other materials, and can form parts with very complex shapes, but this method faces deep dra

Method used

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  • Stamping and local hydraulic compound forming method suitable for large automobile covering parts
  • Stamping and local hydraulic compound forming method suitable for large automobile covering parts
  • Stamping and local hydraulic compound forming method suitable for large automobile covering parts

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Embodiment Construction

[0028] The specific embodiment is described below in conjunction with accompanying drawing:

[0029] figure 1 For the cover that needs to be stamped, the top of the part has a small feature that is a convex hull with cross ribs. According to the part to establish a stamping simulation model such as figure 2 As shown, the blank holder is obtained by extending the flange surface of the part. The blank size is 370×298mm, the thickness is 1.0mm, the unit size is 1mm, the material is DP600 high-strength steel plate, and the blank holder force is 10 tons. The stamping method adopts the single-action forming method with the die on the top and the punch on the bottom.

[0030] image 3 From the forming limit diagram obtained for simulation analysis, it can be seen that the small features on the top of the part will crack at the edge during stamping, and the forming force is 12 tons.

[0031] The thickness contour of the small feature part is as follows Figure 4 As shown, it can...

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Abstract

The invention discloses a stamping and local hydraulic compound forming method suitable for large automobile covering parts. The method comprises the steps of selecting small characteristic regions needing hydraulic forming through simulating calculation; setting the hydraulic forming direction according to the characteristic shapes; establishing a stamping and local hydraulic compound forming die profile; decomposing part forming into the two continuous process of stamping forming and local hydraulic forming in the forming process; in the stamping forming process, obtaining the overall shapes of the covering parts through the traditional stamping mode; forming various small characteristics on the covering parts through local hydraulic forming. According to the method, the forming quality of the local small characteristics can be effectively improved, and the forming efficiency is higher compared with traditional hydraulic forming.

Description

technical field [0001] The invention relates to a compound forming method which combines traditional stamping forming and hydraulic forming in one forming process. Background technique [0002] With the rapid development of aviation, automobile and other industries, aluminum alloys, high-strength steel plates and other materials are widely used, which greatly increases the forming of large-scale covering parts with high precision requirements, large size, deep drawing depth and local complex features. difficulty. Stamping forming is currently the main method of forming large-scale panels. This method applies pressure to the material through a mold installed on a press to cause plastic deformation to obtain the desired shape of the part. This method has high processing efficiency, but it is often prone to cracking or wrinkling when forming for local complex features. Hydroforming realizes the forming of sheet metal by using liquid as a force transmission medium, which can e...

Claims

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Application Information

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IPC IPC(8): B21D35/00
CPCB21D35/002
Inventor 龚志辉赵树武张益豪韩磊陈杰
Owner HUNAN UNIV
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