(一)贯彻形位公差的重要意义机械制造工业是国民经济领域中的一个重要部门,而形位公差的贯彻又是机械制造工业中的一件大事。它可以更好地保证机械 另件的通用互换;可以提高机械产品的精度;可以更合理地使用机器设备和测量器具;可以减少废品;可以降低产品成本,意义很重大。为什么说贯彻形位公差可以更好地保证机械另件的通用互换呢?因为实践经验告诉我们,光是控制尺寸公差,另件的通用互换是得不到充分保证的。如图1所示,尽管小轴 (A) the importance of carrying out the form of position tolerance Machine manufacturing industry is an important sector in the national economy, and the implementation of form and position tolerance is a major event in the machinery manufacturing industry. It can better ensure the universal interchangeability of mechanical parts; can improve the accuracy of mechanical products; can be more rational use of machinery and equipment and measuring instruments; can reduce waste; can reduce the cost of the product, it is of great significance. Why do we say that the implementation of geometric tolerances can better ensure universal interchangeability of mechanical parts? Because practical experience tells us that dimensional control of dimensional tolerances alone can not be fully interchangeable. As shown in Figure 1, despite the small shaft