Abstract
The plasticity of metals can be significantly affected by the application of a magnetic field,otherwise known as the magneto-plastic effect.This paper investigates the magneto-plastic effect in the micro-cutting of a non-magnetic ductile material,single-crystal copper,under a weak magnetic field and re-ports the influence of the phenomenon on the cutting forces and machined surface quality.A softening effect was observed from the large reduction in cutting forces from 3.2 N to 1.5 N under the magnetic field.As compared to the magnetic field intensity and polarity,the variation in magnetic field orien-tations with respect to the cutting direction exhibited a stronger influence on the cutting force,chip morphology,machined surface texture,subsurface microstructure,surface roughness,and machined sur-face microhardness of the copper sample.An analytical model was developed based on the geometry of the cutting chips to correlate the orientation-dependent influence of the magnetic field on the cutting forces.On the surface quality,excessive folds with four different types of morphology produced under magnetic-free cutting were suppressed after applying the magnetic field with the most significant im-provement achieved with the 90° magnetic field direction.The magnetic-assisted changes in machined surface morphology also led to the reduction in machined surface roughness and microhardness.The op-timistic micro-cutting outcomes in this work establish a greater understanding of the magneto-plastic effect and demonstrate the applicability of magneto-plasticity in ultraprecision manufacturing.
维普
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