我厂工具车间常在坐标镗床上加工有孔距要求的斜孔(用作工艺孔)。工艺孔的位置有多种选择,若设计不当,就会产生较大的理论误差,反之,却能提高加工精度。所以,必须对其进行误差分析,以确定较佳方案。现以图1所示的斜孔钻模为例进行分析。该钻模上的Φ15H7孔要求中心线与顶面的交点到20°±5′斜孔中心线的距离A为29.55±0.1。第一种方法是将工艺孔加工在Φ15H7孔中心线和 I plant tool shop often in the coordinate boring machine processing hole pitch requirements of slant holes (for process holes). The location of the process hole has a variety of options, if improper design, it will have a greater theoretical error, on the contrary, it can improve the machining accuracy. Therefore, it must be error analysis to determine the best solution. Now take the slant hole drilling mold shown in Fig. 1 as an example for analysis. The Φ15H7 hole on the drill requires that the distance A from the intersection of the centerline and the top surface to the centerline of the bevel hole 20 ° ± 5 ° be 29.55 ± 0.1. The first method is to process the hole in Φ15H7 hole centerline and