修配时,若需对小型的不规则零件进行回火处理,用热砂回火法,工艺简单,效果很好。其具体方法是: 将不含泥土和其它杂质的普通细砂放在铁盒内加热,使其达到一定温度(砂子与木材接触能冒烟或碎纸 Repair, if the need for small irregular parts tempering, hot sand tempering method, the process is simple, the effect is very good. The specific method is: ordinary sand without soil and other impurities on the iron box heating, so that it reaches a certain temperature (sand and wood contact with smoke or shredded paper