Experimental study of micro- and nano-scale cutting of aluminum 7075-T6

This paper investigates micro- and nano-scale (10 nm–2 μm) machining characteristics of a non-ferrous structural alloy, aluminum 7075-T6 (87 HRB) through a series of cutting experiments. Aluminum 7075-T6 is used in the die and mold making industry for creating prototype molds. The effects of cutting conditions on the machining forces, chip geometry, surface roughness, and derived parameters such as the specific cutting energy, shear angle and mean friction coefficient in orthogonal micro- and nano-scale cutting of Al 7075-T6 are presented and compared with trends observed in conventional macro-scale cutting. Explanations for the observed trends are given.  

Modelling and experimental investigation on nanometric cutting of monocrystalline silicon

A new model to understand the behaviour of how materials are removed from workpiece in nano cutting is proposed. This model postulates that the mechanism of nanometric scale material removal is based on extrusion, which is different from the shearing mechanism in conventional cutting. It also explains why brittle materials are removed in ductile mode. Analytical results from molecular dynamics and nano indentation show good agreement with the proposed modelling. Experiments are conducted to verify the new model for nanometric cutting of monocrystalline silicon. The theoretical modelling and experimental verification present a good understanding of nano-scale material removal and provide an approach to fundamentally control the machining performance.  

刀具磨损对单晶铝纳米切削过程的影响

基于分子动力学的理论建立了单晶铝的纳米切削仿真模型，比较研究了在刀具未磨损和刀具磨损条件下对切削过程的影响。研究表明：相比于刀具未磨损，在刀具磨损的情况下，已加工表面质量有所下降，基体上出现了大量的位错等缺陷；切削力也全部有所升高，其中刃口半径磨损对切削力影响最为显著，在相同的切削条件，相比于刀具未磨损升高约为17.78%，后刀面磨损和前刀面磨损对切削力的影响基本相同，提高了约7.98%；刀具温度和工件的温度也都有不同程度的升高，其中，工件的温升更高。刀具刃口半径磨损对温升影响最大，达到稳定切削时，刀具的平均温度相比于刀具未磨损升高约为7.2%。