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数控加工零件的特点对夹具提出的要求
一是要保证夹具的坐标方向与机床的坐标方向相对固定；二是要协调零件和机床坐标系的尺寸关系。
One is to ensure that the coordinate direction of the fixture and the coordinate direction of the machine tool are relatively fixed; the other is to coordinate the size relationship between the parts and the coordinate system of the machine tool.
除此之外，还要考虑以下几点：
In addition, we should consider the following points:
1）当零件加工批量不大时，应尽量采用组合夹具、可调式夹具及其他通用夹具，以缩短生产准备时间、节省生产费用。
1) When the batch of parts is not large, modular fixture, adjustable fixture and other general fixture should be used as far as possible to shorten the preparation time and save production costs.
2）在成批生产时才考虑采用专用夹具，并力求结构简单。
2) consider the use of special fixtures in batch production and strive for simple structure.
3）零件的装卸要快速、方便、可靠，以缩短机床的停顿时间。
3) the loading and unloading of parts should be fast, convenient and reliable, so as to shorten the pause time of machine tools.
4）夹具上各零部件应不妨碍机床对零件各表面的加工，即夹具要开敞，其定位、夹紧机构元件不能影响加工中的走刀（如产生碰撞等）
4) The parts and components on the fixture should not interfere with the machining of the Parts'surfaces, that is, the fixture should be open, and its positioning and clamping mechanism components can not affect the tool running (such as collision)
One is to ensure that the coordinate direction of the fixture and the coordinate direction of the machine tool are relatively fixed; the other is to coordinate the size relationship between the parts and the coordinate system of the machine tool.
除此之外，还要考虑以下几点：
In addition, we should consider the following points:
1）当零件加工批量不大时，应尽量采用组合夹具、可调式夹具及其他通用夹具，以缩短生产准备时间、节省生产费用。
1) When the batch of parts is not large, modular fixture, adjustable fixture and other general fixture should be used as far as possible to shorten the preparation time and save production costs.
2）在成批生产时才考虑采用专用夹具，并力求结构简单。
2) consider the use of special fixtures in batch production and strive for simple structure.
3）零件的装卸要快速、方便、可靠，以缩短机床的停顿时间。
3) the loading and unloading of parts should be fast, convenient and reliable, so as to shorten the pause time of machine tools.
4）夹具上各零部件应不妨碍机床对零件各表面的加工，即夹具要开敞，其定位、夹紧机构元件不能影响加工中的走刀（如产生碰撞等）
4) The parts and components on the fixture should not interfere with the machining of the Parts'surfaces, that is, the fixture should be open, and its positioning and clamping mechanism components can not affect the tool running (such as collision)
