PWパンチを用いた高張力鋼板穴抜き部の穴広げ性と疲労特性

概要

論文の詳細を見る
In this study, the hole expansion ratio and fatigue properties of high-strength steel sheets pierced using a "press working (PW) punch" were investigated. The PW punch, which was developed to prevent seizing between a punch and a hole surface, was reported to have the effect of smoothing a pierced edge. The PW punch increased the hole expansion ratio at a minute clearance compared with a conventional punch, and at larger clearances, the PW punch decreased it. The reason for this is considered to be the fact that the PW punch suppresses work hardening in the vicinity of the pierced surface and induces work hardening at the inner part of the pierced edge with an increase in clearance. Regarding the fatigue properties, the hole made using the PW punch had a higher fatigue limit than that made using conventional punches at large clearances. This is because a PW punch reduces roughness in the fracture zone.
The Japan Society for Technology of Plasticityの論文