Abstract:

Three types of micro?textures, including broken line grooves, longitudinal grooves and 45° oblique grooves, were constructed on the tool surface and the influence of the tool surface micro?texture on the tool cutting performance during copper?nickel alloy cutting was deeply studied; by controlling a single?variable method, the influence of texture width, texture depth, texture spacing and cutting edge margin on the cutting performance was analyzed, the optimal texture parameter range of the longitudinal groove micro?texture was determined, and the optimal texture parameters were determined through orthogonal experiments. The results show that compared with the non?textured tool, the longitudinal groove micro?textured tool can effectively reduce the main cutting force and cutting temperature; the optimal texture width is 85 μm, the texture spacing is 40 μm, the texture depth is 30 μm, and the cutting edge margin is 40 μm; when the optimal micro?textured tool is used to process copper?nickel alloy, the average main cutting force is reduced by 23.07%, the average value of the maximum cutting temperature is reduced by 22.46%, and the average equivalent stress is reduced by 19.53%, indicating that the residual stress of the workpiece can be effectively reduced and the cutting performance can be improved.

Key words: CBN tools, Copper?nickel alloy, Micro?groove texture, Parameter optimization, Cutting performance

摘要：

在刀具表面构造折线凹槽、纵向凹槽和45°斜向凹槽微织构等三种微织构，深入研究了铜镍合金切削加工时刀具的表面微织构对刀具切削性能的影响；通过控制单一变量法，分析了织构宽度、织构深度、织构间距和切削刃边距对切削性能的影响规律，确定了纵向凹槽微织构的最优织构参数范围，并通过正交实验确定了最优织构参数。结果表明，与无织构刀具相比，纵向凹槽微织构刀具可有效降低主切削力和切削温度；最优织构宽度为85 μm，织构间距为40 μm，织构深度为30 μm，切削刃边距为40 μm；采用最优的微织构刀具加工铜镍合金，平均主切削力减小了23.07%，最高切削温度的平均值降低了22.46%，平均等效应力减小了19.53%，说明能有效降低工件的残余应力，提升切削性能。

关键词: CBN刀具, 铜镍合金, 凹槽微织构, 参数优化, 切削性能