Experimental Study on High Speed Cutting of 7075 Aluminum Alloy

Abstract

A 4-edge cemented carbide end mill with a diameter of 6 mm was used to mill a single factor groove of 7075 aluminum alloy. The results show that the surface roughness of the bottom surface of the narrow groove decreases with the increase of the cutting speed in the range of variable cutting speed. Moreover, when the cutting speed is the highest, the burr on the edge of the narrow groove is not completely eliminated, and there are more burr and curling. When the feed rate is selected as a variable, the surface roughness of the bottom surface of the milling narrow groove increases with the increase of the feed rate. When the cutting depth is selected as a variable, the surface roughness of the bottom surface of the milling narrow groove increases with the increase of the cutting depth. There are obvious extrusion bulge marks between the two intersecting steps on the bottom surface of the milling narrow groove. The reason of extrusion bulge on the bottom surface of milling may be due to the large width and elastic deformation of 7075 aluminum alloy material, which results in large plastic flow under the cutting extrusion of milling tool.