Tool-chip Friction in Cutting SiC Particle Reinforced Aluminum Composites

摘要

This paper reviews what is the nature of the friction contact between chip and tool during chip formation and the historical development of the tool-chip friction models when metals are cutting. It mainly works on analyzing tool/particle contact mechanisms along interface, chip formation, and friction formulation during machining SiC particle reinforced aluminum composites (Al/SiC). After a couple of experiments were carried out, a few of results about the formation and propagation of crack and effects on the tool-chip friction of various volume fraction SiC are presented. Three major contributions of this paper are summarized as follows: (1) the tool-chip friction status incorporated the action of SiC particles can be predicted by using the analytical approach presented in this paper.(2) Tribological performance of the tool-chip is optimized when adding about 20-25% volume fraction SiC reinforcement.(3) During the formation of chip,microcracks propagate at particle/matrix interface facilitates the fracturing through the chip cross-section.This effect reduces the chip sticking period, segment thickness,and tool/chip contact length.