刀具齿数对7050铝合金薄壁筋铣削残余应力的影响

Influence of Tooth Number on Residual Stress of Thin-ribbed 7050 Aluminum Alloy Part

在相同刃口参数和切削参数条件下,采用整体硬质合金螺旋立铣刀进行7050铝合金薄壁筋高速铣削试验,并通过X射线衍射法测量在不同刀具齿数和刃口跳动下的表面残余应力。结果表明:两齿刀具切削产生拉应力,三齿刀具切削产生压应力;刃口跳动量小的刀具所产生切削残余应力值波动小;提高切削线速度将增大应力值并使其向拉应力方向偏移。

Through employing the same edge parameter and cutting condition,the experiments on the high-speed milling of thin-ribbed 7050 aluminum alloy parts with different end mill diameters and tooth numbers are carried out. The surface residual stress is measured by X-ray diffraction method. The results show that tensile residual stress is produced with a two-tooth tool while the compressive stress is produced with a three-tooth tool. The stress fluctuation is smaller with a smaller tool edge run out. With the increase of the cutting speed,the residual stress will be increased and the residual stress tends to shift toward the tensile stress.