论文部分内容阅读
在机械加工中,常遇到一些工件的被加工表面(线)具有一定的角度关系,即被加工表面(线)与定位基准面既不平行又不垂直。Q51型汽车起重机装辊横件就是一个典型的例子(图1)。解决此类工件的加工和测量问题,须采取相应的工艺措施,对工艺尺寸链需要进行计算,才能保证达到产品设计要求。从图1可以看出,它的几何(尺寸、形状和相互位置)精度和表面光洁度要求虽不高,但由于两锥孔φ50±0.05轴心线与φ70D_4轴心线相交15°,如果在车床上采用一般的试切法加工,很难保证两端面E之
In machining, often encountered some of the workpiece surface (line) has a certain angular relationship, that the machined surface (line) and the positioning of the reference plane is neither parallel nor vertical. Q51 type truck crane roller cross-section is a typical example (Figure 1). To solve the processing and measurement of such parts, measures must be taken to process the size chain needs to be calculated in order to ensure product design to meet the requirements. As can be seen from Figure 1, its geometric (size, shape and mutual position) accuracy and surface finish requirements are not high, but because of the two tapered bore φ50 ± 0.05 axis and φ70D_4 axis intersect 15 °, if the lathe On the use of general trial cutting method processing, it is difficult to ensure that both ends of the E