中文摘要：

设计盘铣开槽实验以测量盘铣切削钛合金时的切削力和切削温度,以切削力和切削温度实验为基础,分析不同切削条件下的表面粗糙度、表面形貌、残余应力、显微组织和显微硬度。结果表明：铣削表面中心处的粗糙度值小于边缘处,粗糙度值随着主轴转速的增加而减小,随着切削深度和进给速度的增加而增大。铣削表面和次表面均出现残余压应力,随着深度的增加,残余压应力逐渐减小为零。在切削力的作用下,晶粒沿进给方向发生明显的拉伸变形,α相从初始等轴态拉伸为长片状。随着切削温度的升高,塑性变形区的金相组织发生改变,当切削温度达到β相转变温度时,金相组织从初始等轴态转变为全片层组织。热力耦合作用使得已加工表面和次表面硬度值升高。

英文摘要：

Disc-milling grooving experiment was carried out to measure milling force and temperature for titanium alloy samples. After machining, surface roughness, surface topography, residual stress, microstructure and microhardness under different milling conditions were analyzed. The results show that the surface roughness of the center on milling surface is lower than that of the edge; moreover, the surface roughness decreases with the increase of the spindle speed, but increases with the increase of depth of cut and feed speed. The residual compressive stress is produced on the machined surface and subsurface, and gradually declines to zero with increase of the depth. The microstructure of lattice tensile deformation is found along feed direction under the effect of milling force, progressing from the initial equiaxed structure to long flake lattice. The metallographic structure of plastic deformation zone changes with the temperature, transforming from the initial equiaxed microstructure to a lamellar microstructure when the temperature is up to β-phase transition temperature. The combination of mechanical and thermal loads increases the microhardness on the machined surface and subsurface.