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工件在机床夹具中安装进行机械加工时,首先必须保证工件育正确的定位。所谓正确的定位,除需遵守六点定位的基本原理外,还应保证在工件加工尺寸方向上的定位精度,因此,如何正确分析计算定位误差是摆在机床夹具设计人员面前的首要问题。关于加工尺寸的定位误差Δ_(DW),一般说来主要包括两方面:工序基准的基准不重合误差Δ_(BC)和定位基准的基准位置变动误差Δ_(JW)。前者Δ_(BC)。是指由于定位基准用的不是工序基准(加工工序图上的尺寸起始基
When the workpiece is installed in the machine tool fixture for machining, the workpiece must be correctly positioned. The so-called correct positioning, in addition to abiding by the basic principles of six-point positioning, but also to ensure the positioning accuracy in the direction of the workpiece size, therefore, how to correctly analyze and calculate the positioning error is placed in front of machine tool fixture designers the primary problem. The positioning error Δ_ (DW) for the machining size mainly includes two aspects: the reference misalignment Δ_ (BC) of the process reference and the reference position change Δ_ (JW) of the positioning reference. The former Δ_ (BC). Refers to the positioning base is not used as a benchmark (the starting point of the process on the size of the map