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气门挺杆座和凸轮轴凸轮配成一对摩擦副。凸轮轴凸轮的硬度为H R C 55～63,挺杆座端面的硬度为H R C 60～65。其质量的主要标志是具有良好的耐磨性。经过400小时台架试验和2500公里行车试验及近三年来用户的反映,耐磨性较好。现制定出气门挺杆座高频堆焊的质量检查标准。一、气门挺杆座的图纸技术条件1.气门挺杆座端面堆焊层采用合金铸铁,其焊条的化学成分(%)为:
Valve tappet seat and camshaft cam dubbed a pair of friction. The hardness of the camshaft cam is H R C 55-63, and the hardness of the tappet end face is H R C 60-65. The main symbol of its quality is good wear resistance. After 400 hours of bench test and 2500 km driving test and the user’s reflection in the past three years, wear resistance is better. Now develop a valve tappet high-frequency welding quality inspection standards. First, the valve tappet seat drawings technical conditions 1. Valve tappet seat overlay surfacing alloy cast iron, the electrode of the chemical composition (%):