Abstract
Cold forged products obtained from preliminarily rolled rods of HDPE, PP, POM, ABS and PVC were studied on their elastic and thermal recovery, and secular chnge of dimension. The optimum amount of reduction of area in rolling, and effect of heat treatment, were made clear in order to attain the best qualities of cold forged products. The cold forged products obtained from preliminarily rolled rod was found to have extremely good dimensional stability by heat treatment in boiling water bath. This cold forging process was applied to make small machine parts such as knob, and good results were obtained.
