| Summary: | 碩士 === 國立高雄應用科技大學 === 模具工程系 === 100 === The most important factors of blanking die design are the clearance and the blank holder pressure. The clearance is the major factor affects the characteristic of the cutting edge, tool life, and the stability of blanking process. High profile precision and high flatness requirement of high speed stamping requires more shearing edge and less burr height. The blanking die design is more critical than the stamping equipment.
This paper using two types of basic blanking process, circular and rectangular blanking (axi-symmetrical and plane strain deformations), to study the effect of blanking die design factors for copper alloy C5210R-SH 0.2 mm in thickness. FEM simulations were conducted considering fracture factor of material and the die clearance. Blanking tests were carried out to verify the CAE simulation. The predicted cutting forces were applied to the structure analysis of die components to avoid large deformation of punch and low product precision due to insufficient punch strength.
The cutting edge of experiment specimens were analyzed using image processing technology to obtain the cutting edge characteristic. The hardness distributions were measured using Vicker’s hardness testing. The critical fracture value obtained was 0.35 for CAE simulation via the experimental observation. The proposed simulation technology of this paper is able to predict the cutting process, cutting load, and cutting edge characteristics. The die structure analysis using CAE technology is able to predict the punch deformation based on the cutting process simulation for different die clearance design. As a result, the precision of product and the die life can be increased.
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