因21-4N奥氏体气门钢不能淬火,所以要对气门杆端强化,大部分气门生产厂采用喷焊Ni-Cr-B-Si耐磨合金。现将我厂气门端面喷焊层的机械加工工艺、机械加工出现的缺陷和喷焊层着色探伤问题作一介绍。 一、机械加工 为了使喷焊层与基材产生牢固的冶金结合,光洁度不宜过高,一般为4～5。杆端面对杆的摆差<0.05毫米。喷焊层厚度0.6～1毫米,喷焊的杆端形状如图1,气门 Due to the 21-4N austenitic valve steel can not be quenched, so to strengthen the valve rod end, most of the valve manufacturer sprayed with Ni-Cr-B-Si wear-resistant alloy. Now I plant the valve end spray layer mechanical processing technology, machining defects and spray layer coloring test for an introduction. First, the mechanical processing In order to make the spray coating and the substrate to produce a solid combination of metallurgical, finish should not be too high, usually 4 to 5. The difference between the rod ends facing the rod is <0.05mm. Spray-welding layer thickness of 0.6 to 1 mm, spray rod end shape shown in Figure 1, the valve