镍基合金低温切削加工参数对切削力和粗糙度的影响

Effect of low temperature cutting parameters on cutting force and roughness of nickel-base alloy

  • 摘要: 设计了一种冷冻盘夹具对镍基合金进行铣削加工,针对冷冻铣削阶段的镍基合金氧化后形成燃烧发光现象开展了深入探讨,分析了切削力与进给量、切削速度之间的关系。研究结果表明:切削速度提高后,切削合力先上升再下降。进行低温切削时,通过提高润滑效果与抗黏结性能,可以更加明显减小镍基合金的切削力。切削长度在2 m内,加工阶段形成了片状形态切屑,在表层形成了锯齿状外形;切削长度24 m以上,形成了更大切屑,引起黏性流动结果。提高切削速度后,表面粗糙度Ra上升。较小进给量会引起刀具和工件之间发生更大程度的摩擦作用,引起表面质量下降。TiSiN涂层刀具后刀面形成了众多的黏结物,表现为层叠形态;靠近刃口处的涂层出现了一定程度的剥落,同时存在与基体分离的涂层。利用无晶化低温切削方法处理镍基合金,为设计更优结构的镍基合金刀具提供了参考价值。

     

    Abstract: A kind of cold plate fixture was designed to milling nickel base alloy. The combustion luminescence phenomenon of amorphous alloy after oxidation in cold milling was discussed in depth. The relationship between cutting force and feed and cutting speed was analyzed. The results show that the cutting force increases first and then decreases with the increase of cutting speed. During low temperature cutting, the cutting force of amorphous alloy can be significantly reduced by improving the lubrication effect and anti-bonding performance. The cutting length is within 2 m, the chip shape is formed in the processing stage, and the sawtooth shape is formed in the surface layer. More than 24m of cutting length, larger chip formation, resulting in viscous flow results. The surface roughness Ra increases with increasing cutting speed. Smaller feed will cause greater friction between the tool and the workpiece, resulting in the deterioration of surface quality. Many adhesives are formed on the back surface of TiSiN coated tool in the form of cascade. The coating near the cutting edge is spalling to a certain extent, and there is a coating separated from the matrix. Amorphous alloy is treated by low temperature cutting method, which provides reference value for designing amorphous alloy cutting tools with better structure.

     

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