Influence of Reinforced Particles on Chip Formation Process in Cutting SiCp/Al Metal Matrix Composites

doi:10.3969/j.issn.1000-1093.2019.01.024

Abstract

Abstract: A spring-loaded quick-stop device was designed to investigate the influence of SiC particles on the chip formation process of SiCp/Al composites. The chips and their roots are obtained by orthogonal cutting test, and their morphology and microstructure are observed. The arrangement mechanism of SiC particles along shear band, the fracture and breaking mechanisms of particles, the crack propagation and its influence on chip formation are analyzed. The results show that the acceleration of quick-stop device is large, which means that the chip roots obtained are effective, the force and torque generated by plastic sliding of matrix cause the particles to be arranged along the shear band, and the fractures of particles mainly occur in the shear zones, the separated surface of workpeice and chip, the second deformation zone and the machined surface near the tool nose. The microcracks initiating from the outside free surface and the interior of shear zone propagate along the shear plane. As the cracks propagate along the shear plane, the force applied on chips is unbalanced, which causes the chips to outflow fleetly, and the relative sliding of both sides of the cracks along the shear plane leads to the formation of irregular saw-tooth chips. Key

Key words: SiCp/Almetalmatrixcomposite, quick-stopdevice, particlesarrangement, particlefracture, crackpropagation, chipformation

CLC Number:

TG501.1

DUAN Chunzheng， LIU Yumin， SUN Wei， CHE Mingfan. Influence of Reinforced Particles on Chip Formation Process in Cutting SiCp/Al Metal Matrix Composites[J]. Acta Armamentarii, 2019, 40(1): 208-218.

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第40卷第1期
2019 年1月兵工学报ACTA
ARMAMENTARIIVol.40No.1Jan.2019

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