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1 前言随着内燃机行业的发展,国内近年来引进了许多增压型发动机。这类发动机由于转速和压缩比的提高和增大,使气门的工作条件更加恶劣。排气门的工作温度高达800～850℃。因而对气门的使用性能提出了更高的要求。通过试验分析发现,由于从导管中进入气缸的空气中带有硬粒子,是进气门密封面磨损的重要原因。从导管中进入气缸的空气不像从气缸中排出的残气那样,含有油质,能对磨损面起到一定的润滑作用。在增压发动机中进气门密封面的磨损,比排气门更严重。因此,要求在进气门的生产制造过程中,对其密封面也要进行强化处理-喷焊司太立合金。喷焊合金层结构和喷焊层外貌见图1和图2:
1 Introduction With the development of the internal combustion engine industry, many domestic supercharged engines have been introduced in recent years. Such engines due to the speed and compression ratio increased and increased, the valve working conditions even worse. Exhaust valve operating temperature up to 800 ~ 850 ℃. Therefore, the valve performance requirements put forward higher requirements. Through the test analysis found that due to the air into the cylinder from the catheter with hard particles, is the inlet valve sealing surface wear an important reason. The air entering the cylinder from the duct does not contain the oil like the residual gas discharged from the cylinder and can exert a certain lubricating effect on the wearing surface. In the supercharged engine intake valve sealing surface wear, more serious than the exhaust valve. Therefore, it is required in the manufacturing process of the intake valve, the sealing surface also need to be strengthened - Spray Welding Stellite. Spray-welding alloy layer structure and spray coating appearance in Figure 1 and Figure 2: