全苏压缩机科学研究所制订了一项在卧式锻压机上镦制直径为100毫米以下的压缩机活塞杆毛坯新工艺（图1）。采用新工艺制造活塞杆毛坯时只是轴肩部位有变形。这部分的晶粒当毛坯加热时长大,在镦粗变形过程中被细化,而非变形部位上的晶粒则在热处理时被细化（图2）。 All-Su Compressor Science Institute has developed a new technology for upsetting compressor piston rod blanks below 100 mm diameter on a horizontal forging press (Figure 1). When using the new technology to make piston rod blank, there is deformation in the shoulder area. This part of the grain grows when the blank is heated, is refined during the upsetting deformation, and the grains on the non-deformed part are refined during the heat treatment (Fig. 2).