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到目前为止,工厂中对於定位销长短的精确区分往往不很注意,书本中亦很少介绍。虽然问题较小,但它在夹具设计中是常遇到的问题,因此我认为有必要提出来讨论一下。所谓定位销长短之分,并不仅依其本身的长短来决定,并且还要看它对另件在定位过程中自由度的限制数目是两中呢?还是四个。前者为短销、後者为长销、这点在很多书上已有说明。为了给以明确的量的概念,我们可以假想有一个如[附图]的另件,它具有一定的间隙δ_c。当端面对孔轴心的垂直误差由小而大时,另件由於间隙的存在而逐渐倾斜,间隙也相应减小,到完全消除为止。在此以前,工件端面
So far, the exact distinction between the length of the pins in the factory is often not very noticeable and is rarely described in books. Although the problem is minor, it is a common problem encountered in fixture design, so I think it is necessary to discuss it. The so-called location of the pin length of the points, not only by its own length to decide, but also depends on the other piece in the positioning process of the degree of freedom of the number of two? Or four. The former is short sales, the latter is long sales, this point has been described in many books. In order to give a clear idea of quantity, we can assume that there is an attachment as shown in the figure with a certain gap δ_c. When the end face of the hole axis of the vertical error from small to large, the other due to the existence of the gap between the gradually inclined, the gap is also reduced accordingly, until completely eliminated. Prior to this, the workpiece end face