| YUE Xiujie,WANG Youqiang,ZHANG Ping,YU Xiao,WANG Xuezhao.Effect of Interrupted Aging on Cutting Surface Quality and Tool Wear of 7075 Aluminum Alloy[J],53(4):152-161 |
| Effect of Interrupted Aging on Cutting Surface Quality and Tool Wear of 7075 Aluminum Alloy |
| Received:March 21, 2023 Revised:July 03, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.04.014 |
| KeyWord:7075 aluminum alloy interrupted aging XRD surface quality cutting force tool wear |
| Author | Institution |
| YUE Xiujie |
College of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| WANG Youqiang |
College of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| ZHANG Ping |
College of Mechanical and Power Engineering, Guangdong Ocean University, Guangdong Zhanjiang , China |
| YU Xiao |
College of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| WANG Xuezhao |
College of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
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| Abstract: |
| 7075 aluminum alloy is widely used in the aerospace field for main load bearing structural parts because of its high specific strength and specific stiffness and good corrosion resistance. The overall "hollowing" process is often used. Due to the large size, thin wall and easy deformation of the overall structural parts, there is a risk of fatigue fracture in the face of the complex service environment. The selection of the appropriate aging treatment can often improve the cutting surface integrity and mechanical properties of the material and increase its fatigue life. In this paper, 7075 aluminum alloy was firstly subject to T6I4 interrupted aging treatment, with T6 continuous aging treatment as the control group. The machined surface and tool wear morphology were characterized by an X-ray diffractometer (SX-27mini) and a scanning electron microscope on the machined specimens after aging. The effect of interrupted aging on the surface integrity of machined 7075 aluminum alloy was investigated. The results showed that the main precipitated phase of 7075 aluminum alloy after T6 and T6I4 aging treatment was η(MgZn2) phase. The position of the main peak of the diffraction of the T6 aluminum alloy specimen (111) was 38.51° at the same cutting parameters. In contrast, the T6I4 aluminum alloy specimen (111) diffracted the main peak position of 38.22°, which shifted toward the direction of the lower diffraction angle. The half-height width of the diffraction peak of the XRD pattern of the 7075 aluminum alloy with T6I4 interrupted aging was larger than that of the T6 aging treatment, introducing a larger residual compressive stress. The surface roughness was negatively correlated with the cutting speed, and positively correlated with the cutting depth and feed rate, only the T6 aluminum alloy showed a trend of increasing, then decreasing and then increasing with the increase of cutting depth. The surface roughness of T6I4 interrupted aging treatment at different cutting speeds was 5.8% lower than the maximum of T6 aging treatment, while the maximum reduction was 1.9% and 17.1% at different cutting depth and feed rate. And the surface of the workpiece mainly had defects such as chip adhesion, micro-cracks and micro-porosity. The cutting force showed a trend of increasing and then decreasing with the increase of cutting speed, and the minimum cutting force was 361.021 N when the cutting speed was 1 000 m/min. The cutting force was positively correlated with the cutting depth and feed rate, and only the Y-directional cutting force of T6I4 aluminum alloy showed a trend of decreasing and then increasing with the increase of feed rate. Increasing the cutting speed and reducing the feed rate could effectively improve the tool wear, and in the cutting process tool wear was mainly in the form of chipping and bonding wear. In summary, T6I4 interrupted aging shows better surface quality, less cutting forces and less tool wear compared with T6 continuous aging treatment. And the larger cutting speed and smaller feed rate and cutting depth help to improve the machinability of 7075 aluminum alloy. |
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