Surface characteristics of precision as-cut NdFeB magnet considering diamond wire wear

• Published in: Precision engineering Vol. 89; pp. 23 - 36
• Main Authors: Zhang, Xingchun, Gao, Yufei, Yang, Chunfeng, Shi, Zhenyu
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.08.2024
• Subjects: Diamond wire saw; NdFeB; Process parameters; Saw wire wear; Surface characteristics; NdFeB; Surface characteristics; Diamond wire saw; Saw wire wear; Process parameters
• ISSN: 0141-6359
• DOI: 10.1016/j.precisioneng.2024.06.004

NdFeB is the highest output value permanent magnet material at present, which has extremely high magnetic properties and is widely used. In the production process of NdFeB, cutting is an indispensable process, and high precision as-cut surface characteristics can reduce the cost of subsequent processes. In this paper, the single factor sawing experiment of NdFeB was carried out by using the range of processing parameters in industrial production. The effects of workpiece feed speed, saw wire speed, workpiece processing size and diamond saw wire wear on sawing surface morphology, surface material brittleness removal ratio, roughness and waviness were studied. The research shows that the surface characteristics of the workpiece sawed in the stable wear stage of the diamond saw wire are the best. In all service stages of the saw wire, reducing the feed speed and workpiece processing size, and increasing the wire speed will reduce the surface roughness and waviness, reduce the number and size of pits, and reduce the proportion of brittle removal areas. The research results provide an experimental reference for the optimization of diamond wire saw cutting parameters of NdFeB. •Influence of wire wear on surface characteristics in NdFeB sawing is analyzed.•Cut surface characteristics in early service stage of saw wire are relatively poor.•Better surface characteristics are achieved in stable service stage of the saw wire.•Abrasives on saw wire surface are worn flat and fall off in its later service stage.•Increasing wire speed, decreasing ingot feed speed and size can improve the surface characteristics.