人们通常认为,高速钢锻造加热速度过快坯件易发生内裂,所以,尽管很早以前就有人对锻造高速钢时采用快速加热的工艺作过研究,但直到现在,人们仍然认为两阶段或三阶段加热法(图1,图2)比较妥当。每一阶段预热后缓慢升温到下一个阶段,其 It is generally believed that high-speed steel forging overhearing is prone to internal cracks in the blank, so although a long time ago, there was a study of the rapid heating process forging high-speed steel, but until now, it is still believed that two-stage or Three-stage heating method (Figure 1, Figure 2) more appropriate. Warm up slowly to the next stage after preheating in each stage