Wu Bin, Zhang Zhenyu, Feng Junyuan, Meng Fanning, Wan Shengzuo, Zhuang Xuye, Li Li, Liu Haoran, Zhang Fuxu
Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China.
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China.
Materials (Basel). 2023 Feb 11;16(4):1521. doi: 10.3390/ma16041521.
Diamond wire sawing is widely used in processing NdFeB rare earth permanent magnets. However, it induces periodic saw marks and fracture chipping pits, which severely affect the flatness and surface quality of the products. In this study, the lateral motion of the diamond wire was monitored to determine the surface formation mechanism. Then, a white light interferometer and an SEM were used to observe the sawed surface profile. Finally, the surface quality was quantitatively studied by identifying the area rate of fracture chipping pits with an image recognition MATLAB script. According to the observation results, the calculation formula of PV which is related to the process parameters was deduced. Additionally, by combining the fracture rate and wire vibration, a novel method was proposed to investigate the optimal process parameters. It can be found that the surface quality sawed at = 0.21 MPa, = 0.2 mm/min, and = 1.8 m/s remains better than when sawed at = 0.15 MPa, = 0.1 mm/min, and = 1.8 m/s, which means the sawing efficiency can be doubled under such circumstances, i.e., when the surface quality remains the same.
金刚石线锯广泛应用于钕铁硼稀土永磁体的加工。然而，它会产生周期性的锯痕和断裂崩坑，严重影响产品的平整度和表面质量。在本研究中，监测金刚石线的横向运动以确定表面形成机制。然后，使用白光干涉仪和扫描电子显微镜观察锯切表面轮廓。最后，通过用MATLAB图像识别脚本识别断裂崩坑的面积率来定量研究表面质量。根据观察结果，推导了与工艺参数相关的PV计算公式。此外，结合断裂率和线振动，提出了一种研究最佳工艺参数的新方法。可以发现，在σ = 0.21 MPa、v = 0.2 mm/min和vₙ = 1.8 m/s条件下锯切的表面质量优于在σ = 0.15 MPa、v = 0.1 mm/min和vₙ = 1.8 m/s条件下锯切的表面质量，这意味着在表面质量相同的情况下，锯切效率可提高一倍。
