스퍼기어의 제조공정에 따른 치수변화와 잔류응력에 관한 연구

Steel tube has been used widely in many fields, such as in the power, transportation and chemical industries and so on. Therefore, most of the time, their mechanical properties are strictly required in detail. In order to enable those parts to work within the safety limits a large variety of heat treatments are conducted in precedent studies. Especially, to produce bended pipe, many process and simulation technique has been developed. Bending applying local induction heating is an efficient way to produce bended pipes of various radius with lower cost and to provide better quality product, since it was invented by Dai-ichi High Frequency Co.(DHF) of Japan in 1961. And it is very important to simulate bending process with transient and residual stresses in surface hardening by high frequency induction heating, to predict the process result. In this paper, to verify confidence of bended pipe, FEM simulation was conducted and compared with the residual stress using hole-drilling gage method.