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机床夹具定位误差分析准则:定位误差(包括夹紧误差)必须是位移误差的分量与加工尺寸方向一致时才成立,否则该误差可视为零。一、基准不重合时的定位误差图1中n表示加工尺寸A的设计基准,O表示工件的定位基准。n与O的联系尺寸为S;设其误差为△S,它在加工尺寸方向上的分量(投影)为λ;定位基准的位置误差δ在加工尺寸方向上的分量为δ_p,则定位误差△_(dw)值为:式中:——设计基准和定位基准连线与加工尺寸方向间的夹角;β——定位基准的位移误差方向与加工尺寸方
Machine tool fixture positioning error analysis guidelines: Positioning error (including clamping error) must be the component of the displacement error and the processing of the size of the same direction is established, otherwise the error can be regarded as zero. First, the reference does not coincide when the positioning error Figure 1, n represents the design of the processing size A benchmark, O said workpiece positioning reference. the contact size of n and O is S; the error is △ S, and the component (projection) in the direction of processing size is λ; the position error of positioning reference δ is δ_p in the direction of processing dimension, then the positioning error △ _ (dw) Values are: Where: - design basis and positioning reference connection and the angle between the size of the processing direction; β - positioning reference displacement error direction and processing dimensions