在机器制造业中用塑料零件代替某些金属零件,不仅能降低制造成本,而且能提高使用寿命2～14倍。图1和图2示明10ΓК型压气机进气阀传动机构的球面塑料垫块,以及该阀的有塑料镶块防护头的初步试验结果。塑料零件的结构特点对其使用性能影响极大。现有塑料零件的设计和使用经验证明,当改用塑料制造零件时,如果生搬硬套金属零件的结构是得不到最大效果的,在某种情况下还 In the machinery manufacturing industry to replace some of the plastic parts of metal parts, not only can reduce manufacturing costs, but also improve the service life of 2 to 14 times. Figures 1 and 2 show the initial test results of a spherical plastic spacer of a 10ΓК-type air intake valve actuator with a plastic insert protection head for the valve. The structural characteristics of plastic parts have a great impact on its performance. Experience in the design and use of existing plastic parts proves that when plastic parts are used instead, the structure of the bare metal parts is not maximized, and in some cases