从1985年4月开始,为节约外汇,我厂冷轧辊淬火用的进口橡胶石棉板挡水环改用国产的橡胶石棉板制作。采用国产橡胶石棉板挡水环淬火时,轧辊入水端(传动侧)20～60mm位置处常发生辊面坏状裂纹,见图1。1985年共淬火334根,其中38根发生裂纹,占全年淬出量的11.38％,并呈急剧上升趋势,所以解决环裂辊的任务十分突出。 Since April 1985, in order to save foreign exchange, the imported rubber asbestos retaining ring used in the cold rolling of our factory has been changed to domestic rubber asbestos board. Using domestic rubber asbestos retaining ring quenching, the roll into the water side (drive side) 20 ~ 60mm position often occur on the roll surface bad cracks, shown in Figure 1. 1985 a total of 334 quenching, of which 38 cracks occur, accounting for The amount of annual quenching amount of 11.38%, and a sharp upward trend, so the task of solving the ring ruler is very prominent.