并不是所有材质都适合用精密零件加工，对于金属材料来说，硬度依次排序为不锈钢、铸铁、铜、铝。而陶瓷和塑料等的加工是属于非金属材料的加工。限于加工机件的硬度要求，在某些场合来说材料是硬度值越高越好，但是加工的材料也不能过于太硬，否则无法进行加工的。所以要根据加工的器件的作用来对机件合理选材，一般的场合，材质最好是软硬适中比较适用。 Not all materials are suitable for precision parts processing. For metallic materials, the hardness is ordered in order of stainless steel, cast iron, copper and aluminum. And the processing of ceramic and plastic is belong to nonmetallic material processing. It is limited to the hardness of the machine parts. In some cases, the material is better and the higher the hardness value, but the processed materials cannot be too hard, otherwise it cannot be processed. Therefore, according to the function of the processing device to make a reasonable selection of the machine parts, general occasions, the material is best is the soft and hard moderate comparison is applicable. 什么是精密机械加工 What is precision machining 在进行精密机械加工前必须要注意所选材质的密度（硬度），如果硬度已超过机件（车床车刀）的硬度，不但无法加工的且有可能会损坏零件或造成危险，比如以往有过车刀飞崩出去伤人等事件发生。因此对于机械类加工来说，材料材质必须要低于机刀的硬度，这样才能被加工。 Before in the precision machining must be pay attention to the material density (hardness), if the hardness is more than (lathe turning tool) the hardness of the parts, not only will not be able to process and could be dangerous or damaged parts, such as in the past had fly lathe tool crash out wounding incident. Therefore, for mechanical processing, the material material must be lower than the hardness of the machine tool so that it can be processed. 精密机械加工主要有精车、精镗、精铣、精磨和研磨等工艺。所呈现的效果：零件的界限或特征尺寸公差在微米以下；几何形状和相互位置精度达到微米或角秒级；表面微观不平度小于0.1 微米;互配件能满足配合力的要求与精确的力学或其他物理特性要求。 Precision machinery processing mainly includes fine car, fine boring, fine milling, fine grinding and grinding techniques. The effect of the present: the boundary of the part or the characteristic dimension tolerance is below micron; The geometric shape and interposition accuracy are either micrometer or angular second; Surface microscale is less than 0.1 micron; The interparts can meet the requirements of the combined forces and precise mechanics or other physical characteristics.