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目前线切割加工已广泛应用于模具制造行业中,但线切割加工的工件表面硬度低、磨损快,有时还出现碎裂现象。根据近几年国外对这一问题的探索,发现造成上述现象的主要原因是由于在线切割加工的工件表面形成了“电加工变质层”。下面将电加工变质层的组织状况以及防止和去除变质层的方法作一介绍。 1.变质层的组织状况线切割加工是利用放电发出的高热和电解作用使金属熔融或气化来进行加工的。加工后工件加工表面因急速冷却使熔融状态的金属再凝固而形成了“电加
At present, wire cutting has been widely used in the mold manufacturing industry, but the workpiece surface hardness of wire cutting low wear fast, and sometimes fragmentation. According to the exploration of this issue in foreign countries in recent years, it is found that the main reason for the above phenomenon is that the surface of the workpiece machined by the on-line cutting forms a “deteriorated layer by electric machining”. The following will be the processing of metamorphic layer of the organization and prevent and remove the metamorphic layer method for an introduction. 1. Metamorphic layer of tissue state Wire cutting is the use of discharges issued by the heat and electrolysis of metal melting or gasification for processing. After processing the workpiece surface due to rapid cooling of the molten state of the metal and then solidified to form a "plus