Development of Cup Inner Surface Smoothing Process by Ironing

摘要

Ironing process is a normal method to improve the surface quality and thickness precision of a drawn cup. The ironing process is generally used to outside of a drawn cup, and the trial to improve the inside surface quality is not carried out very much. The purpose of this study is to clarify the effect of ironing process on the improvement of inner surface cuality of multi-stage drawn cup. The effects of the ironing reduction, lubricant and punch shape on the improvement of the inner surface properties are investigated by using a series of experiment. It is found that the inner ironing process is effective to improve the inner surface properties of a drawn cup.