切削参数对镍基热喷涂层表面形貌的影响

Effect of Cutting Parameters on Surface Morphology of Nickel Based Thermal Sprayed Coatings

为提高镍基热喷涂层的制造合格率,减少重新喷涂次数,同时提高涂层表面质量并降低对涂层与基体结合强度的影响,对涂层切削加工过程中切削参数的影响进行了研究。分析了涂层切削加工过程中,由于涂层内部结构缺陷导致涂层脱落的情况,提出了一种采用硬质合金刀具对镍基热喷涂层进行切削试验的方法,此法通过改变切削参数以及切削条件以达到质检要求,为实际加工提供参考。通过选用合适的切削参数,对镍基涂层车削加工过程中的切削力进行测量,以及对切削加工后零件的表面粗糙度进行测量,得出影响镍基涂层切削性能的主要因素,在保证涂层表面质量及结合强度的条件下,最优的加工方案为VC=50m/min、ap=0. 3mm、f=0. 1mm/r。结果表明:切削深度是影响涂层表面质量的主要因素,涂层切削过程中物质形态的不均匀导致刀具与工件之间产生冲击与振动是影响涂层结合强度的重要原因。

In order to improve the manufacturing qualification rate of nickel based thermal spraying coating,reduce the number of re coatings,improve the surface quality of the coating and reduce the influence of the bonding strength between the coating and the substrate,the influence of cutting parameters on the coating cutting process is studied.In the analysis of the coating during the machining process,due to the internal structure of coating defects cause the coating off situation,puts forward a method of using hard alloy cutting test of Ni based coating,the method by changing cutting parameters and cutting conditions to meet the requirements of quality inspection,to provide reference for the actual processing.By selecting the appropriate cutting parameters,measuring the cutting force of Ni based coating in turning process,as well as the rough parts of the surface after machining are measured,the factors that mainly affect the cutting performance of nickel based coatings,in ensuring the quality of coating surface and the bonding strength under the condition of,the optimal processing scheme is VC=50m/min、ap=0.3mm、f=0.1mm/r.The results show that cutting depth is the main factor affecting the surface quality of coating.The uneven shape of the coating during cutting process leads to the impact and vibration between tool and workpiece,which is the important reason that affects the bonding strength of the coating.