くさび型工具によるアルミニウム板の突切り切断加工の有限要素法解析

Abstract

Gutting characteristics of an aluminum sheet (Al 100P–O) on an anvil by the penetration of a wedge shape punch is investigated. Numerical simulations of the cutting process are conducted using a rigid plastic finite element code developed by the authors. Various expressions of fracture initiation are used as fracture criteria and linked with the simulation. The deformation characteristics of the sheet and the cutting force are calculated in terms of nose angle and radius of the wedge shape punch. The applicability of the fracture criteria and the effects of nose angle and radius on the fracture value distribution are discussed on the basis of the calculated results. The simulation results for the various fracture criteria were almost same, except for the Glift fracture criterion. The simulation results show that the fracture value increases with punch penetration depth and the highest value appears at the edge of the punch. It is also predicted that when the punch penetration depth reaches about 80% of the sheet thickness the crack initiates at the edge of the punch. To confirm the results of the simulations, cutting experiments are carried out and the cutting mechanism is observed. The experimental results are qualitatively in good agreement with the simulation results.