铣削减材工艺对激光熔覆增材Fe45合金表面质量的影响研究

Research on the effect of milling process on surface quality of laser cladding additive Fe45 alloy

针对激光熔覆增材再制造Fe45合金表面质量差,不能满足精密机械零部件的功能和装配要求,对激光熔覆层进行铣削减材加工。文章研究了铣削减材工艺对铣削力、表面粗糙度以及微观形貌的影响规律,采用正交试验方法进行了铣削减材试验。通过方差和极差分析方法,评价了主轴转速S、进给速度F、切削深度ap对熔覆成型件铣削力和表面粗糙度的影响规律;从微观角度分析了铣削减材工艺对表面形貌和切屑的影响。结果表明,铣削减材工艺参数对成型表面质量影响较大,其中对铣削力影响最大的是铣削深度,对表面粗糙度影响最显著的是进给速度;Fe45激光增材成型件经过铣削加工后,表面粗糙度Ra由13.68μm最低可降至1.7μm,降低了87.6%。由实验可知,铣削减材工艺能够大幅提高激光熔覆增材再制造Fe45合金表面质量,对激光熔覆涂层机械加工具有指导意义。

To address the problems of poor surface quality of laser cladding additive remanufactured Fe45 alloy,the laser cladding layer can not meet the function and assembly requirements of precision machinery parts.The influence of the milling process on milling force,surface roughness and micromorphologies were studied.The milling subtractive test was carried out by orthogonal test method.The effects of spindle speed(S),feed speed(F)and cutting depth(ap)on milling force and surface roughness of additive parts were evaluated by variance and range analysis.The influence of milling subtractive process on surface morphology and chip is analyzed from the microscopic point of view.The results show that the milling parameters have a great influence on the surface quality,and the most significant effect on the milling force is the milling depth,and the most significant effect on the surface roughness is the feed speed.The surface roughness Ra of Fe45 laser additive can be reduced from 13.68μm to 1.7μm after milling,which is 87.6%lower.From the experiment,it can be seen that the milling reduction process can significantly improve the surface quality of laser cladding additive remanufacturing Fe45 alloy,which has guiding significance for the mechanical processing of laser cladding coatings.