铣削参数对7055-T6铝合金耐腐蚀性的影响

Milling Parameters on Influence of 7055-T6 Aluminum Alloy Corrosion Resistance

文摘研究了铣削工艺参数对切削力、表面粗糙度、轮廓与形貌、自腐蚀电位和电流密度的影响。结果表明:随着切削速度的增大,切削力与表面粗糙度呈现先增大后减小再增大的变化规律;随着轴向切深的增加,切削力与表面粗糙度都呈增大的趋势;铣削后刀面对已加工表面的挤压改善了铝合金的腐蚀性能;切削转速为4 000 r/min,轴向切深为0.25 mm时,加工表面耐腐蚀性能最优;在较大的轴向切深下,已加工表面易产生微裂纹,而导致腐蚀加剧。

The process parameters on cutting force, surface roughness, surface profile and morphology, the cor- rosion and current density were studied. The results show that the milling force and surface roughness increase first then decrease and then increase with the increase of milling speed, and the milling force and surface roughness in- crease with the cutting depth increasing, The corrosion resistance of machined surface is improved by the extrusion strengthening of milling flank face. When the cutting speed is 4000r/min and the axial depth is 0.25mm, the corrosion resistance of the machining surface is the best. The micro-cracks are prone to produce under relatively larger cutting depth, so the corrosion of machined surface becomes more intense.