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机械加工是一种用加工机械对工件的外形尺寸或性能进行改变的过程。按被加工的工件处于的温度状态,分为冷加工和热加工。一般在常温下加工,并且不引起工件的化学或物理变化,称冷加工。一般在高于或低于常温状态的加工,会引起工件的化学或物理变化的,称为热加工。冷加工与热加工的处理方式有差别,按照不同的处理,冷加工常见的包括切削加工以及对压力的加工,而通常我们所见的铸造、焊接等一般为热加工。
Machining is the process of changing the form factor or performance of a workpiece with a machining machine. According to the temperature of the workpiece being processed state, divided into cold and hot processing. General processing at room temperature, and does not cause chemical or physical changes in the workpiece, said cold processing. Generally above or below normal temperature processing, will cause the workpiece chemical or physical changes, known as thermal processing. Cold and hot processing are different ways of handling, according to different treatment, common cold work include cutting and processing of the pressure, but we usually see the casting, welding and other general thermal processing.