Development of Cup Inner Surface Smoothing Process by Ironing

Abstract

Ironing process is a normal method to improve the surface quality and thickness precision of a drawn cup. Multi-stage processes that combined drawing and ironing, have been developed to obtain the cups with a each surface quality. However, the ironing process is generally used to outside of the drawn cup, and the trial to improve the inside surface property is not carried out very much. The purpose of this study is to clarify the effect of ironing process on the improvement of the surface quality of multi-stage drawn cup. The effects of the ironing reduction, lubricants 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.

Determination of the effect of thickness reduction ratio, die angle, and coefficient of friction on residual stresses in ironing process: an analysis using computer simulation

“…The research was conducted through experiments to obtain the effect of punch design, TRR, and lubrication on the quality of the inner surface of the cup. The results show that the inner-ironing process is effective for improving the inner surface quality of the drawn cup, the optimal punch shape is 15° angle and a low viscosity lubricant produces a smooth surface, optimal surface roughness [9].…”