一引言我们在设计夾具的时候,往往在一开始就考虑到工件的定位问题;就是如何将工件按置在夾具上面,使它和切削工具成一定的位置,以便进行加工而得到工作图上所要求的尺寸。要适当地将工件按置在夾具上,就必需研究利用工件的那一表面或那几个表面与夾具的用以定位的另件表面相接触而达到定位的目的。这种被用来定位的工件表面,就是这里要谈的所谓基准。其次,在设计某一工件的施工程序时,从毛坯开始,经过一系列的工序,按步就班地加工成为完工件的全部过程中,对于采用工件的那一个表面或 An introduction We are in the design of fixtures, often from the outset to consider the positioning of the workpiece; is how the workpiece is placed on the fixture above, so that it and the cutting tool into a certain position, in order to carry out the work on the map Required size. To properly place the workpiece on the fixture, it is necessary to study the surface of the workpiece or those surfaces in contact with the surface of the fixture for positioning to achieve the purpose of positioning. This is used to locate the workpiece surface, is here to talk about the so-called benchmark. Secondly, in the design of a construction process of a workpiece, starting from the rough, through a series of processes, step by step to complete the process of finishing the workpiece for the use of that one surface or