Research on Friction during Hot Deformation of Al-Alloys at High Strain Rate

The paper is linked to the investigation of lubricants for massive hot forging. It was observed temperature range of 200-470°C and screw press was used for tests. The research on friction has been done for Al-Mg and Al-Cu-Mg-Fe-Ni aluminium alloys. In this connection, physical and numerical investigation of friction are performed. On the basis of the ring upsetting technique, the effect of temperature on the friction factor value has been investigated. The regressions for the relationship between friction factor and temperature for all lubricants under study have been obtained. Moreover, the sets of calibration curves were drawn. Each set of calibration curves corresponds to the definite type of aluminium alloy as well as definite conditions of deformation. Some practical recommendations were given.