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内燃机气缸盖上的进排气门导管孔与阀座孔是同轴孔。它是气缸盖的关键加工部位,也是各种同轴孔中较难加工的结构。通常对阀座孔与导管孔的精加工有三点要求:(1) 阀座锥孔与导管内孔间(压配导管及座圈后)的同轴度,一般为0.015～0.02mm;(2) 阀座圈45°锥孔的几何精度;(3) 阀座锥孔面与导管孔表面的光洁度(一般为▽8)。这三点要求中尤其是阀座锥孔与导管内孔间的同轴度,对气门密封性的好坏影响最大。多年来,它一直是我国汽车及发动机制造行业的工艺难题。少数工厂靠进口的专用设备才完成其最终的精加工。
Intake and exhaust valve cylinder bore on the cylinder head and seat hole is a coaxial hole. It is the key processing cylinder head parts, but also a variety of coaxial holes more difficult to process the structure. Usually the valve seat hole and the catheter hole finishing three requirements: (1) seat conical bore and catheter bore (pressure with catheter and seat) coaxiality, generally 0.015 ~ 0.02mm; (2 ) Geometrical accuracy of 45 ° cone at seat ring; (3) Smoothness of valve cone bore and tube bore surface (typically ▽ 8). In these three requirements, especially the conical hole between the valve seat and the bore of the catheter, the valve sealing effect is most affected. For years, it has been a technological challenge for China’s automotive and engine manufacturing industries. A small number of factories rely on the import of specialized equipment to complete its final finishing.