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发动机运转时,配气机构的技术状态取决于缸盖制造质量。因加工原因而引起的任何毛病,均会对内燃机的工作指标产生不良影响。因此,对加工缸盖用的设备及工艺的要求,一直很严格。对缸盖内深孔加工的精度要求很高。这些孔的特点是,它们相对零件基准面的公差很小。安装气阀的孔即是此类孔的典型例子。如汽油机气阀座倒角相对气阀导管孔轴线的摆差不可大于0.03～0.05mm;而柴油机上的摆差则不可大于0.02～0.03mm。实践表
Engine operation, the technical status of the valve body depends on the quality of cylinder head manufacturing. Any problems caused by the processing will have an adverse effect on the working index of the internal combustion engine. Therefore, the processing of cylinder head with the equipment and technology requirements, has been very strict. Deep hole in the cylinder head machining accuracy is very high. These holes are characterized by their small tolerances relative to the part datum. The hole to install the air valve is a typical example of such a hole. Such as gasoline engine valve seat chamfer relative to the valve guide hole axis deviation can not be greater than 0.03 ~ 0.05mm; and the deviation on the diesel engine can not be greater than 0.02 ~ 0.03mm. Practice table