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采用硬质合金刀具,通过一系列的单因素直角切削试验对铝合金7050-T7451微切削加工中的切屑形貌、切削力以及尺度效应等进行了研究。为了便于使用Kistler9257B型测力仪进行加工过程切削力的测量,对工件进行处理,使用数控铣削中心实现直角车削。试验方案在不同切削速度下变换切削深度,考虑刀具刃口半径的存在对微切削加工过程的影响。试验中收集不同切削参数下的切屑,得到切屑的宏观形貌;对切屑进行抛光腐蚀,在高倍光学显微镜下获取切屑的微观形貌,研究了切削参数对切屑厚度和卷曲程度等的影响规律。试验过程中实时测得不同切削条件下的切削力,讨论了微切削加工过程切向力和径向抗力受刀具刃口半径影响下的变化规律,并从单位切削力的角度出发研究了刀具刃口半径对微切削加工过程中尺度效应的影响规律。
Carbide tools were used to study the chip morphology, cutting force and scale effect in 7050-T7451 aluminum alloy micromachining process through a series of single-factor right-angle cutting test. In order to facilitate the use of Kistler9257B-type dynamometer for measuring the cutting force during machining, the workpiece is machined and the CNC turning center is used for turning at a right angle. The experimental scheme changes the cutting depth under different cutting speeds, and considers the influence of the cutter radius on the micro-cutting process. In the experiment, the chips were collected under different cutting parameters to obtain the macro-morphology of the chips. The chips were polished and polished to obtain the micro-morphology of the chips under a high power optical microscope. The influence of cutting parameters on the chip thickness and degree of curling was studied. The cutting force under different cutting conditions was measured in real time. The variation of tangential force and radial resistance under the influence of cutting edge radius was discussed. The cutting edge Influence of mouth radius on scale effect during micromachining.