微织构(W,Mo)C基刀具和YG8刀具对钛合金干切削性能的影响

刀具切削钛合金时存在切削温度高、单位面积上切削力大等问题,微织构刀具可以有效减小摩擦力,减小切削力。通过正交实验法设计微织构参数,研究微织构参数对Al 2O 3/La 2O 3/(W,Mo)C无黏结相硬质合金刀具以及YG8刀具切削钛合金实验的切削性能影响。实验结果表明,合适参数的沟槽型微织构能有效降低Al 2O 3/La 2O 3/(W,Mo)C无黏结相硬质合金刀具和YG8刀具切削TC4钛合金的切削力,相同沟槽参数下,无黏结相硬质合金刀具的切削力明显低于YG8刀具的切削力;合适参数的沟槽型微织构能有效降低刀具刀屑界面的摩擦系数,相同沟槽参数下,无黏结相硬质合金刀具的摩擦系数大都低于YG8刀具的摩擦系数;沟槽深度10μm、沟槽间距100μm以及沟槽宽度30μm的沟槽参数下,切削钛合金时,无黏结相硬质合金刀具前刀面无明显磨损,后刀面只有边界磨损,YG8刀具发生崩刃,前刀面出现切屑的滞留。

Effect of micro-texture(W,Mo)C-based tool and YG8 tool on dry cutting performance of titanium alloy

There are problems such as high cutting temperature,large cutting force per unit area,and serious tool adhesion for titanium alloys cutting.Micro-texture tools can effectively reduce friction,cutting temperature and cutting force.Micro-texture parameters were designed by orthogonal experiment method to study the effect of micro-texture parameters on the cutting performance of Al 2O 3/La 2O 3/(W,Mo)C binderless cemented carbide tool and YG8 for cutting titanium alloy.The results show that the grooved micro-texture of suitable parameters can effectively reduce the cutting force of Al 2O 3/La 2O 3/(W,Mo)C binderless tool and YG8 tool for cutting TC4,cutting force of binderless cemented carbide tool is significantly lower than that of YG8 tool under the same groove parameters.The grooved micro-texture of suitable parameters can effectively reduce the friction coefficient of interface between tool and chip.The friction coefficient of binderless cemented carbide tool is much lower than that of YG8 tool under the same groove parameters.When the groove parameters have a depth of 10μm,a pitch of 100μm and a width of 30μm,there is no obvious wear on rake face of binderless cemented carbide tool and only boundary wear on flank face for cutting titanium alloy.YG8 tool occurs tipping and chip retention on rake face.