Calculation of Temperature Rise in Wire Finish Rolling Mills by Heat Line Theory

A new method to calculate temperature rise in high speed wire rolling is proposed according to heat line theory. For high rolling speed and poor cooling conditions in wire finish rolling，the rolling process can be considered as adiabatic and the external work done during the process is nearly all transformed into heat, that means all the heat making wire temperature rise come from the shear power along tangential velocity discontinuity lines in deformation zone， which called thermal distribution lines or ‘heat lines’. The temperature rise for a pass is the sum of temperature rises of those heat lines in the deformation zone of the pass. From the theory and assumption that for a single pass the elliptic long or minor axis is not deformed, a formula of temperature rise of the wire during finish rolling was derived out. The calculated and measured temperature rises for  6.5 mm wire are compared. The results show that the calculated temperature rise is slightly less than the measured one and the lower temperature of wire at entry, the higher the accumulative temperature rise is.