Abstract:

With regard to the milling process of TC18, the effect of tool geometrical parameters on milling force and surface integrity were studied based on orthogonal experimental method. An empirical model of milling force was built; the absolute and relative sensitivities of milling force with respect to rake angle, clearance angle and helix angle were analyzed; the effects of tool geometrical parameters on surface roughness and surface residual stress were investigated by Taguchi method. The results show that the milling force is small in the case of big rake angle, small clearance angle and big helix angle; the milling force is more sensitive to helix angle than clearance angle, least sensitive to rake angle;compressive residual stress can be detected on all the machined surface; the helix angle has significant effects on surface roughness, the clearance angle has significant effects on surface residual stress.

Key words: titanium alloy, tool geometrical parameter, milling force, surface integrity

摘要：

针对TC18钛合金铣削过程，采用正交试验研究了硬质合金刀具几何参数对铣削力和表面完整性的影响，建立了铣削力经验模型，并分析了铣削力对刀具前角、后角和螺旋角的绝对灵敏度和相对灵敏度；采用田口法分析了刀具几何参数对表面粗糙度和表面残余应力的影响。结果表明：大前角、小后角、大螺旋角的条件下铣削力较小，铣削力对刀具螺旋角的变化最敏感，对后角次之，对前角最不敏感；铣削表面均为残余压应力，刀具螺旋角对表面粗糙度的影响显著，刀具后角对表面残余应力的影响显著。

关键词: 钛合金, 刀具几何参数, 铣削力, 表面完整性