An investigation of the hole diameter and circulirty on the stainless steel sheet perforated via by deep cryogenically treated cold work tool steel punches

Abstract

Because of punch wear increases finished hole errors, Hole quality and punch wear are closely related. This phsical errors can be found on the surface of the part and characterise its quality and accuracy. Punch errors are substantialy related with punch wear and process parameters. The purpose of this work was to investigate the effect of cryogenically treated punches on AISI 304 austenite stainless steel sheet piercing hole errors. In accordance with this purpose, the punching was carried out in a punch machine using 5, 6 and 7 mm diameters of AISI D3 cold work tool steel punches and 1.5 mm thick stainless steel sheets. One punch group in 36 hours was subjected to the deep cryogenic process at -145°C in addition to the conventional heat treatment. The deep cryogenic process was carried out to improve the wear resistance and hole quality. For this work, punch weight losses were measured and punch wear was evaluated through analysis of SEM and OM images. The hole diameter and circularity of the selected products were measured in the specified number of perforation AISI 304 austenite stainless steel in the CMM. Results showed that the deep cryogenic process applied to the punches was shown to increase the punch wear performance. Moreover, it increased the part quality by having a positive effect on the hole quality of the AISI 304 austenite stainless steel workpieces.