METHOD FOR DESIGNING MATERIAL TO BE SUBJECTED TO CYLINDER FORMING AND PRODUCT FORMED BY PERFORMING CYLINDER FORMING

摘要

Provided are a method of designing a material having mechanical characteristics such that a spring-back angle of a predetermined value can be obtained after a cylinder formation process of materials having various mechanical characteristics or thicknesses, and a processed product. A method of designing a material for a cylinder formation process, when designing a metal material subjected to a cylinder formation process involving bending, comprises: calculating a yield strength YP, a Young's modulus E, and a thickness t of the metal material such that a spring-back angle ?? has a predetermined value after a cylinder formation process under the conditions of a bending radius of curvature r of 5 mm or more and a bending angle ? of 90° or more and 180° or less; and designing the metal material such that the metal material has the calculated yield strength YP and Young's modulus E.