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高速钢刀具,例如滚刀、滚模、扦齿刀、剃齿刀等,其圆截面锻件在滚圆、倒棱等径向压下锻打中,中心为周期性拉伸应力状态,如果锻造不当,即产生星形裂纹甚至孔洞,在后续加工中就产生孔壁裂纹。这种缺陷存在于锻件内部,隐蔽性强,锻造过程中不易发现,机加工时再发现只能为废品。因此,需要从锻造加工入手,分析各种锻件内孔裂纹产生的原因及应当采取的对策。 (1)坯料加热温度偏低,有效保温时间不足或掌钳工操作不熟练,打击时间过长,导致坯料温度降
High-speed steel cutting tools, such as hobs, rolling molds, skewer cutters, shaving knives, etc., whose round cross-section forging is subjected to radial forging such as rounding and chamfering. The center is a cyclic tensile stress state. If the forging is improper , That is to produce a star-shaped cracks or even holes in the subsequent processing holes cracked wall. This defect exists in the forging interior, concealed strong forging process is not easy to find, machining and then found only for scrap. Therefore, it is necessary to start with the forging process and analyze the causes of the cracks in the inner holes of various forgings and the countermeasures that should be taken. (1) the billet heating temperature is low, the effective holding time is not enough or not suitable for the operation of the fitter, blow time is too long, resulting in billet temperature drop