High-strength plate stamping process and mold manufacturing
In the process of stamping process design of automobile high-strength board, the scientific supplement modeling and the variable-draw drawing rib design are scientifically reduced, the number of mold debugging is reduced, the mold manufacturing cycle and manufacturing cost are shortened, and the product quality is guaranteed.
The use of high-strength panels in the body structure can reduce the weight of the body by about 25% and save about 15% of fuel. Therefore, improving the utilization rate of the high-strength plate in the structural parts of the vehicle body is of great significance for realizing light weight, energy saving, environmental protection and safety performance of the automobile.
This paper introduces the stamping process design and mold manufacturing precautions of high-strength sheet in automotive panels in combination with the actual situation.
Stamping
Figure 1 shows a stamping part of the company responsible for developing a mold project – the front impact beam outer panel. The material is D340LA, the material thickness is 1.2mm, and the outer dimensions are 1290mm in length, 220mm in width and 67mm in height.
Figure 1 Front anti-collision beam outer panel
According to the size of the product shown in Figure 1, we can see that the external shape of the product is not complicated, but it belongs to high-strength steel. In general, for the stamping process of high-strength sheet metal parts, problems such as part distortion, springback and warpage may occur and must be solved. Therefore, pay attention to the following matters during the stamping process:
1. Fully draw forming
When the high-strength sheet metal parts are stamped, the shape should be fully extended as far as possible, and should not be realized by the subsequent flanging and shaping process, that is, the drawing is formed by drawing, so that the sheet material can be fully plastically deformed and reduced. Its own rebound stress. However, how to make the plastic deformation of high-strength plates can be achieved by designing a reasonable process. In the past, the drawbeads of such parts were usually designed to be round, but for this part, we used square bars, see Figure 2 and Figure 3.
Figure 2 Front anti-collision beam outer plate drawing digital model
Figure 3 Front anti-collision beam outer panel drawing rib size
2. Perform CAE analysis
After the digital forming process is completed by the drawing forming process, the CAE analysis must be performed, and according to the analysis result, the rebound tendency of the part is determined, and then the data is compensated, and the compensated digital mode is used as the processing basis. Figures 4 and 5 show the springback compensation for the drawing process of the part in this case.
Fig. 4 Longitudinal rebound compensation of the outer beam of the front anti-collision beam
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