一面两销定位在机械加工中应用较广,原来的方式(圆柱销、菱形销)定位总存在着移动误差△_?和转动误差△_?,因而在某些情况下会出现定位超差现象。如果过分提高定位元件精度以满足定位不超差的要求,则会给夹具制造带来困难,有时甚至是不可能作到的。针对这个问题,我们可以采用两胀销定位的方法,使△_?≈0,△_?≈0。现介绍如下。 如图1所示,将原来的圆柱销和菱形销改制成可 One side of the two-pin positioning is widely used in machining, the original way (cylindrical pin, diamond pin) positioning there is always a movement error △ _? And rotation error △ _ ?, and thus in some cases will appear over-positioning phenomenon . If the positioning element accuracy is increased too much to meet the requirements of positioning does not exceed the tolerance, it will create difficulties fixture, and sometimes impossible. In response to this problem, we can use two expansion pin positioning method, so △ _? ≈ 0, △ _? ≈ 0. Now introduced as follows. Shown in Figure 1, the original cylindrical pin and diamond pin restructuring can be