回火是工模具淬火后的重要热处理工序,它不仅是为了达到图纸规定的硬度使交验合格,更重要的是充分发挥回火的作用,以保证和提高工模具的使用寿命。有关文献中曾介绍,搜集上海地区27个工厂早期失效的90套模具进行分析,其中因回火不足的有20套,占22.2％。工模具的回火属于比较简单的操作,但由于重视不够,反而成为很薄弱的环节。由此可见,就目前的 Tempering is the mold after quenching an important heat treatment process, it is not only to achieve the hardness of the drawings to pass the inspection, more importantly, give full play to the role of tempering to ensure and improve the service life of tooling. The literature has been introduced to collect the early failure of 27 factories in Shanghai, 90 sets of molds for analysis, of which there are 20 sets due to lack of tempering, accounting for 22.2%. Tool tempering is a relatively simple operation, but due to insufficient attention, but has become very weak links. It can be seen from the moment