RESIDUAL STRESSES DUE TO DEEP-DRAWING OF PRE-COATED ALUMINUM-ALLOY SHEETS

摘要

In this study, we examined how the press formability of Al alloys sheets and the generation of residual stresses was influenced by pre-coating resins, lubricants, die shoulder radius, the punch shoulder radius, and so on. The use of a pre-coated layer offers advantages by preventing direct contact between sheet metal and the face of the die, and also by enabling the use of volatile oil lubricants that keep the factory environment cleaner. The circumferential residual stress (σ{sub}c) of a cup becomes lower when the lubricant is less effective, and when the die shoulder radius is smaller.