泥浆泵滑块、滑套表面处理技术研究

通过对3NB-500型泥浆泵滑块、滑套摩擦副的失效分析,明确指出滑块表面热处理工艺不合格、表面硬度低、严重的磨料磨损等是其失效的主要原因;对比分析了各种表面强化技术特点,确定氧-乙炔火焰喷焊技术是强化滑块表面较为合理的方法。在磨损试验的基础上,优选的强化材料为PHNi60+WC15%,并制定了相应的喷焊工艺;同时,对滑块、滑套摩擦副的结构以及拉杆端密封结构进行了改进设计。现场使用证明,经表面处理后的滑块、滑套摩擦副使用效果很好。

STUDY OF THE SURFACE TREATMENT TECHNOLOGY OF DRILLING PUMP GLIDING BLOCK-SLIDING SLEEVE

The failure factors of the crosshead and sliding sleeve on 3NB-500 drill pump were discussed in details in this paper. It was proposed strengthening the surfaces of the crosshead and slide sleeve to reduce wear and improve their service life. Oxy-gen-acetylene flame spray welding technique was selected to use for the strengthening treatment. PHNi60A+WC15% was tak-en as the strengthening material. The wielding technology was determined to obtain a spray welding thickness of 0.5 mm and the surface hardness is greater than 60HRC. In addition, the structures of the crosshead and sliding sleeve and the seal at the pull rod end were modified. The field application has indicatedthat the strengthened and modified crosshead and performance was very good. And the wear between the crosshead and sliding sleeve was reduced greatly and the service life of the crosshead and the pull rod end seal are improved remarkably.