拔型クリヤランスの研究

概要

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In order to obtain a suitable clearance of blanking dies, authors have tried to analize the process of punching metal sheets by the aid of micro-photography of etched sections. On the photographs of specimens punched half-ways, the following three elements were observed : the specific depth of press at the instant of outbreak of cracks δ, the angle of inclination of the crack θ, and the angle of inclination of fibrous structure made by the plastic flow. The specific depth of press is a ratio of the actual depth of press D to the thickness of the sheet H. The values of these three elements depend on the properties and degree of work hardening of the material, but have nothing to do with the thickness of the sheets. Authors have derived a formula to calculate the most suitable clearance C of the blanking dies from these elements as follows : C=(H-D) tan θ=(1-δ) Htan θ
一般社団法人日本機械学会の論文