气门与气门座之间密封性好坏直接影响到发动机的动力性和经济性。原4115缸盖(没有镶气门座)为整体式,材料为HT20—40,由于浇铸后冷却速度缓慢,硬度一般只能达到HB170左右,该气门口耐磨性比较差。为了提高气门座耐磨性,我厂从1982年起生产的4115缸盖进、排气门座都采用了镶座工艺(见图1):进、排气门座材料为耐磨盼硼铬钼合金铸铁,硬度也 Valve and valve seat between the seal of a direct impact on the engine power and economy. The original 4115 cylinder head (no valve seat) is monolithic, the material is HT20-40. Due to the slow cooling rate after casting, the hardness is generally only about HB170, and the wear resistance of the valve port is rather poor. In order to improve the wear resistance of the valve seat, the 4115 cylinder head inlet and outlet valve seats produced by our factory from 1982 are all fitted with a mounting seat process (see Figure 1). The material of the inlet and exhaust valve seats is wear-resistant boron boron Molybdenum alloy cast iron, hardness is also