EFFECTS OF COLD-ROLLING ON THE COLD-FORGING OF SOLID POLYMER

Cold-forged products obtained from preliminarily-rolled rods of HDPE, PP, POM, ABS and PVC were studied for their elastic and thermal recove ry, and secular change of dimension over time. The optimum amount of r eduction of area in rolling, and the effect of heat treatment, were ma de clear in order to attain the best qualities of cold-forged products . The cold-forged products obtained from preliminary-rolled rod were f ound to have extremely good dimensional stability when subjected to he at treatment in a boiling-water bath. This cold-forging process was ap plied to make small. machine parts such as knobs, good results being o btained. (C) 1998 Elsevier Science S.A. All rights reserved.