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Causes of progressive stamping die damage and retooling measures to reduce carbide punch fracture

Baosteel Technical Research 2016年第4期10卷 30-35页

作者： LIANG Gaofei YAN Yuanyuan LUO Xiaoliang LIN Changqing FU Yan'an SHAO Zongqiang Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai 201900 China Manufacturing Management Department Baoshan Iron & Steel Co. Ltd. Shanghai 201900 China Customer & Product Service Department Baoshan Iron & Steel Co. Ltd. Shanghai 201900 China

We investigated the reasons for frequently appearing early failure of carbide punches in a progressive stamping die when they were used to produce magnetic shielding steel parts. The failure modes of the carbide punches were statistically classified. Edge chipping and shoulder fracturing were the two types of failure modes that were found. The composition, hardness, and microstructure of the punches were analyzed. The cobalt content was found to be too low to ensure sufficient toughness. The brittle phase of tungsten carbide （WC）was prone to breaking off during the shear cutting process, and resulted in edge chipping. In addition, the material chips were easily bonded to the punch edge when there was a lack of press oil lubricity. It resulted in an uneven blanking clearance, which caused a lateral force and finally resulted in shoulder fracturing of the punches. Improvement measures were introduced to address the abovementioned issues. By using the carbide punches with greater toughness and shear cutting oil with high lubricity, the early damage problems of the punches are effectively solved, which ensures normal production of the magnetic shielding steel parts.

关键词： progressive die shear cutting failure fracture

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