Surface should be used as a fine datum to be processed first, because the precision of the positioning of the surface is more accurate, the smaller the clamping error is.

用作精基准的表面应先加工出来，因为定位其准的表面越精确，装夹误差就越小。

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Aiming at these problems, this paper studies how the original error affects the accuracy, works out its allowable values, and finds out the equation between friction of pins and clamping force.

针对这一问题，本文研究了零件加工误差对动模板合模位置的影响，得出了零件加工误差的许用值范围，并计算了由于销轴摩擦力对合模力放大比的影响关系式。

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Then to avoid the accumulated error of the traditional process's multiple clamping.

避免了传统工艺的多次装夹而积累的误差。

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