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在夹具设计中,当工件以定位基准A(下平面)和定位基准E(侧平面)定位,分别能获得三点和一点定位,再以定位孔的中心线B获两点定位时,则工件在夹具中的位置完全确定,即六点定位,如图1所示。本文将这种定位方式简称为“两面一孔”定位。一、基准位置误差和基准角度误差计算两面一孔定位,是以机械加工后获得的精基准实现定位的。因此,定位基准A的表面不平整对基准位置误差的影响很小,在计算时可不考虑,即定位基准A的基准位置误差△_(JWA)=0 定位基准B的基准位置误差取决于定位孔与定位
In the fixture design, when the workpiece is positioned with the positioning reference A (lower plane) and the positioning reference E (side plane), three points and one point are obtained respectively, and two points are positioned by the center line B of the positioning hole, then the workpiece The position in the fixture is completely defined, ie the six-point positioning, as shown in Figure 1. This article referred to this positioning method referred to as “two sides and one hole” positioning. First, the reference position error and the reference angle error calculation Two-hole and one-hole positioning, is based on precision machining to achieve the positioning. Therefore, the surface unevenness of the positioning reference A has a small influence on the reference position error, which can be ignored in the calculation, that is, the reference position error of the positioning reference A (JWA) = 0 The reference position error of the positioning reference B depends on the positioning hole With positioning