Punching technique for hypogynous metal bumper of heavy-duty car

A technology for heavy-duty vehicles and bumpers, applied in the field of auto parts stamping, can solve the problems of high mold maintenance costs, difficult forming, and cumbersome stamping process, so as to improve the product qualification rate, reduce the number of mold sets, and shorten the debugging cycle.

Inactive Publication Date: 2008-08-13
中国重汽集团济南技术中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large thickness of the steel plate material and the difficulty in forming, the existing stamping process is relatively cumbersome and requires 6 processes: 1. Deep drawing: position and draw the shape of the part with two adjacent sides; 2. Trimming: Trim the periphery; 3. Shaping; 4.

Method used

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  • Punching technique for hypogynous metal bumper of heavy-duty car
  • Punching technique for hypogynous metal bumper of heavy-duty car

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] The structure of the lower metal bumper of a heavy-duty vehicle is shown in Figure 1, with holes on the front and sides.

[0019] Because the lower metal bumper does not require high appearance quality, it is not necessary to adopt the usual deep-drawing process. The deep drawing process needs to add more process supplements, and the excess process waste will be repaired when trimming. According to the process of the present invention, the material is blanked first, then shaped, and finally trimming, punching, and side punching are performed to obtain the product shape. Specific steps are as follows:

[0020] (1) Blanking

[0021] First, the blanking process is carried out, and the block material is dropped and punched to obtain the expanded shape of the product as shown in Figure 2. Due to the complex expanded shape, the blanking adopts a closed blanking method. Adding process supplements during blanking, including the supplement of steel plate materials, and adding proces...

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PUM

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Abstract

The invention provides a punching technique for a lower metal bumper of a heavy-duty truck, comprising: (1) blanking: adding technique supplement when blanking, designing and producing a set of moulds according to blanking size and technique supplement to perform blanking, using wave cutting edge in the blanking mould; (2) modeling: locating according to technique holes added at the two sides of the blanking, modeling by using the mould; (3) trimming, punching front surface holes and side surface holes: designing and producing a set of complex moulds which can completes trimming the molded two ends, punching the front surface holes and side surface holes at the same time. Since the invented technique uses blanking-molding technique instead of the drafting technique, the material is saved, trimming, punching front surface holes and side surface holes are combined in one procedure, the amount of mould set is reduced, the mould cost is reduced, the mould debugging period is shortened, error generated by multitime positioning is avoided, and product precision and pass percent are improved.

Description

technical field [0001] The invention relates to a stamping process for a lower metal bumper of a heavy-duty vehicle, and belongs to the technical field of stamping of auto parts. Background technique [0002] The lower metal bumper of heavy-duty vehicles used in engineering vehicles is generally designed as an integral type. The main requirement is impact resistance, and the appearance quality is not high. Its structure is shown in Figure 1, with holes on the front and side. Therefore, the thickness of the steel plate material of the lower metal bumper is relatively large, generally between 2.5mm and 3.0mm, and its shape is relatively complex, with a specific product shape. Due to the thick steel plate material and difficult forming, the existing stamping process is relatively cumbersome and requires 6 processes: 1. Deep drawing: position and draw the shape of the part with two adjacent sides; 2. Trimming: Trim the periphery; 3. Shaping; 4. Partial trimming and punching fro...

Claims

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Application Information

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IPC IPC(8): B21D53/88B21D35/00B21D37/12B21D37/10B21D28/02B21D22/02B21D28/24B21D19/00
Inventor 李永俊付磊李相伟
Owner 中国重汽集团济南技术中心有限公司
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