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1 前言柴油机气门是用来控制柴油机进气和排气,是一种高速往复运动的零件。其工作条件十分恶劣,它同高温燃气接触,温度高达600～800℃。排气门的气门头在排气时要受到高速、炽热的具有化学侵蚀性的气体冲刷,进气门的气门头在进气时又受到冷空气的冷却作用。无论排气门,还是进气门都由于弹簧和惯性而导致对气门座的撞击。绝热发动机中的气门要经受更高的温度,在6105QA绝热机中排气温度升高近50℃,在B6135绝热复合机中排气温度升高近110℃,绝热机中的气门还要求能够起到隔热作用,因此对气门材料的要求更为苛刻。
1 Introduction Diesel valve is used to control the intake and exhaust of diesel engine, is a high-speed reciprocating parts. Its working conditions are very poor, it comes into contact with hot gas, the temperature up to 600 ~ 800 ℃. Exhaust valve head in the exhaust to be high-speed, hot chemical erosion of the gas erosion, the intake valve head in the intake air by cold air cooling. Regardless of the exhaust valve, or intake valve due to the spring and inertia caused by the impact on the valve seat. The valves in adiabatic engines are subjected to higher temperatures, the exhaust temperature in the 6105QA adiabatic machine rises nearly 50 ° C, the exhaust temperature in the B6135 adiabatic laminator rises nearly 110 ° C, and the valves in the adiabatic machine are also required to be capable of To the role of insulation, the valve material on the more demanding requirements.