发动机气门座铰磨工具的改进

Improvement of Engine Valve Seat Reaming and Grinding Tools

成套的手工气门座铰刀，使用一段时间以后，其定位导杆与气门导管壁产生磨损，破坏了原有的配合精度，使定位导杆失去了导向定位的作用，便修复气门座的铰磨加工变得十分困难。将铰刀改进成组合式，便提高了工作效率和加工质量。

After using valve seat manual reamer set for a period,the positioning guide rod will be worn with the valve guide wall,hence the original fitting accuracy is reduced and positioning guide rod out of function,which causes the reaming and grinding operations in repairing valve seats very difficnlt. A combined reamer has been modified by the author,consquently the working efficiency and repairing quality are improved.