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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。
The experiments of plate-grooving and grooving were designed to measure the cutting force and cutting temperature when cutting titanium alloy plate. Based on the experiment of cutting force and cutting temperature, the surface roughness, surface morphology, residual stress and microstructure under different cutting conditions Tissue and microhardness. The results show that the roughness at the center of the milling surface is smaller than that at the edge, and the roughness value decreases with the increase of the spindle rotation speed. The roughness increases with the cutting depth and the feed rate. Residual compressive stress appears on both the milling surface and the subsurface, and as the depth increases, the residual compressive stress gradually decreases to zero. Under the action of cutting force, the grain undergoes significant tensile deformation along the feed direction, and the α phase stretches from the initial isometric state to a long sheet. With the increase of cutting temperature, the microstructure of the plastic deformation zone changes. When the cutting temperature reaches β transformation temperature, the microstructure changes from the initial isotropic state to the whole lamellar structure. Thermal coupling makes the surface and subsurface hardness increased.