A new method for evaluation of friction in bulk metal forming

摘要

In this investigation a simple theoretical analysis of the cylindrical compression test has been developed so that the constant friction factor can be estimated quantitatively by using cold/hot compression test. The compression tests have been carried out on the Ti-IF-steel without lubricant, with mica sheets and with glass powder lubricants the commercial aluminum with oil lubricant to confirm this analysis. This new method for obtaining the constant friction factor may be called "The Barrel Compression Test". The advantages of the proposed method are: (i) very simple method, (ii) high sensitivity of geometrical shape of cylinder to friction condition, (iii) does not need force measurement, and (iv) the constant friction factor can be determined for forming processes corresponding to actual processing condition.