Analysis of temperature conditions of the process of pipe ends upsetting

This work is devoted to the process of pipe ends upsetting on a hydraulic press SMS Meer at JSC “PNTZ” (Pervouralsk). To reduce strain resistance and to localize deformation, pipe ends are heated in three inductors up to the temperature of 1150-1250 °C. The heating accuracy of pipe ends in temperature and length is one of the factors that determine the quality of the finished product. Due to the importance of this problem, the work devoted to the study of temperature conditions of the process of pipe ends upsetting was carried out at JSC “PNTZ”. This work was carried out using a thermal imager ThermaCAM P640 and as a result the process of pipe ends heating before upsetting was studied. It was found that due to heat conduction a part of heat from the heated end of the pipe is redistributed into the pipe cold part and as a result the actual heating length is 80 mm less than the predetermined value. In addition, recommendations are given how to change the setting of stationary pyrometers to improve the accuracy of their readings. Furthermore, the work shows the temperature distribution along the pipe after cooling during the workpiece transporting from the heating device to the upsetting position and after the upsetting process itself.