关键词: 直流磁处理, 硬质合金刀片, 7050铝合金, 切削性能, 刀片磨损

Abstract: As a high-strength material,7050 aluminum alloy has problems such as workpiece materials adhesion on the tool during the milling process,resulting in lowering the surface quality of the workpiece and intensifying tool wear. In order to improve the cutting performance of the insert,a method was proposed to treat a cemented carbide insert with a DC magnetic field to increase its micro-hardness. In order to study the cutting performance of magnetized cemented carbide inserts for processing aluminum alloys,a magnetization orthogonal test of uncoated cemented carbide inserts was designed,and the cemented carbide inserts were treated with DC magnetic fields and milled with them. The research results show that the micro-hardness of the insert after magnetic treatment has been improved,and the surface quality of the workpiece is improved after milling. Compared with the untreated insert,the wear area of the front cutting surface and the wear band width of the rear cutting surface of the insert after treatment have increased and decreased. However,under the appropriate magnetic field parameters (magnetic field strength of 0.5 T,magnetization time of 40 s,magnetic field angle of 0°),the micro-hardness of the cemented carbide insert has been improved by 5.74 %,the surface roughness of the workpiece is reduced by 40 %,and the wear area of the front cutting surface and the wear band width of the rear cutting surface are reduced by 3.44 % and 35.67 % respectively.

Key words: DC magnetic treatment, cemented carbide insert, 7050 aluminum alloy, cutting performance, insert wear