汽车发动机的气缸盖,由于长时间受到高温、高压的作用,特别是在气缸盖紧固螺栓松紧度不均匀的情况下,其扭曲、变形的现象经常发生。在修理工作中,对气缸盖一般都采用磨削方法,但是,随着气缸盖磨削量的增加,燃烧室的容积减小,以致造成发动机压缩比的增加,使发动机的正常燃烧将受到影响,运转过程中产生爆燃 Cylinder head of automobile engine, due to prolonged high temperature and high pressure, especially in the tightness of the cylinder head fastening bolts uneven, the distortion, deformation of the phenomenon often occurs. In the repair work, the cylinder head is generally used grinding method, but as the cylinder head grinding capacity increases, the volume of the combustion chamber decreases, resulting in increased engine compression ratio, the normal combustion of the engine will be affected , Deflagration occurred during operation