Investigation of relationship between blanking conditions and characteristics of edges of products blanked by two-step counter blanking processes: study on burr-free blanking I

摘要

Finite element method (FEM) simulation has been performed for burr-free blanking processes such as conventional two-step counter-blanking and so-called push-back blanking, and the relationship between the blanking conditions and the characteristics of product edges has been investigated. In the conventional two-step counter-blanking process, there are many process parameters such as the first step punch penetration, the first step blanking clearance and the dimensions of the punch and die. The present study aims at determining the successful conditions in which time and cost can be reduced for burr-free blanking by experimental trial and error. In order to achieve this, FEM simulations are performed to clarify the deformation modes of material under various blanking conditions and to identify the successful blanking conditions for burr-free blanking. It is shown that the results of FEM simulations are qualitatively in good agreement with those of experiments using a stainless-steel sheet of 1 mm thickness.