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Analysis of the effect of punch wear on shear surfaces in the piercing process  

Jeon, Yong-Jun (Mold & Metal Forming R&D Department, Korea Institute of Industrial Technology)
Kim, Dong-Earn (Mold & Metal Forming R&D Department, Korea Institute of Industrial Technology)
Publication Information
Design & Manufacturing / v.16, no.3, 2022 , pp. 28-33 More about this Journal
Abstract
The recent increasing application rate of advanced high-strength steel(AHSS) for automotive parts makes it difficult to ensure the durability of forming tools. Significant load and friction generated during the piercing process of AHSS increase the wear rate and the damage degree to dies. These harsh process conditions also yield product failures, such as dimensional inconsistency of pierced holes and insufficient quality of hole's sheared edge. This study analyzed the effect of punch wear on the sheared surface of pierced parts and the forming load during the piercing process. Wear-shaped punches showed approximately 20% higher piercing load than normal-shaped punches, and the rollover ratio of the sheared surface also increased. It is considered that the dull edge of wear-shaped punches does not penetrate directly into the material but shears after tensioning it in a piercing direction. In addition, wear-shaped punches experienced compressive load even after completing the piercing process during the down-stroke and tensile load during the up-stroke. This load variation is related to the smaller diameter piercing holes produced by wear-shaped punches compared to normal-shaped punches. Thus, we demonstrated the predictability of the wear level of dies through a comparative analysis of the piercing load pattern.
Keywords
Piercing; Piercing load; Punch shape; Shear surface; Wear;
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  • Reference
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