发动机气门座圈压装工艺研究

Study on press fitting process of engine valve seat insert

为提高气缸盖气门座圈压装质量,优化气门座圈压装工艺。以柴油发动机气门座圈的压装过程为切入点,分析气缸盖的底孔加工要求、气门座圈压装工装、压装驱动方式等,得到合理的气缸盖底孔直径、粗糙度、跳动及底孔倒角结构,设计能保证气门座圈与气门座圈底孔同轴度的压装工装,并采用伺服电缸驱动压装,监控压装过程质量。本研究为提高气门座圈压装质量及发动机工作的稳定性提供可行方案。

In order to improve the press fitting quality of cylinder head valve seat insert and optimize the press fitting process of valve seat insert.Taking the pressing process of valve seat insert of diesel engine as the breakthrough point,the processing requirements of bottom hole of cylinder head,pressing tooling of valve seat insert and pressing driving mode are analyzed.The reasonable diameter,roughness,runout and chamfering structure of bottom hole of cylinder head are obtained.The press fitting tooling which can ensure the coaxiality of the valve seat insert and the bottom hole of the valve seat insert are designed,and the servo electric cylinder is used to drive the press fitting to control the quality of the press fitting process.This study provides a feasible scheme for improving the press fitting quality of valve seat insert and the working stability of engine.