激光熔覆技术在液压支架再制造中的应用研究

Research on Application of Laser Cladding Technology in Hydraulic Support Remanufacturing

激光熔覆技术不仅克服了镀铬工艺污染严重、结合力弱及耐蚀性差等不足,而且可将基体缺陷恢复到原尺寸。详细制订了液压支架再制造流程,并阐述了各闭环流程工艺参数及检验要点。通过对粉末性能、组织性能、耐蚀性能和耐磨性能等熔覆层性能的研究,得出结果:熔覆粉末具有自脱氧和造渣能力;熔覆层呈树枝状结晶,属于马氏体组织;评级Rp达到9级以上时,需保留最低熔覆厚度0.3 mm;湿沙橡胶轮磨损累计失重不大于0.45 g/3 000 r。

Laser cladding technology not only overcomes defects of chrome-plating process such as serious pollution, weak binding force and poor corrosion resistance, but also restores matrix defects to original size. Remanufacturing process of hydraulic support was formulated in detail, and technological parameters and inspection key points of each closed-loop process were described. After study on performances of cladding layer, such as powder property, microstructure property, corrosion resistance and wear resistance, it is concluded that cladding powder has the ability of self-deoxidation and slagging capacity;cladding layer presents dendritic crystal and belongs to martensitic structure;when rating Rp reaches 9 or above, minimum cladding thickness of 0.3 mm shall be retained;after wet-sand rubber wheel wear test, accumulated weight loss is less than 0.45 g/3 000 r.