Title: Study on turbulence control method and surface quality analysis of softness abrasive flow machining

Authors: Chen Li; Fei Dong; Junchao Zhao

Addresses: Department of Quality and Safety Engineering, China Jiliang University, Hangzhou, China; Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Zhejiang University of Technology, Ministry of Education, Hangzhou, China ' Department of Quality and Safety Engineering, China Jiliang University, Hangzhou, China ' Department of Quality and Safety Engineering, China Jiliang University, Hangzhou, China

Abstract: To improve mould structural surface quality, the softness abrasive flow (SAF) finishing method is proposed. By setting restrained component to the mould surface, restrained flow passage can be set up. In the flow passage, micro force and quantity cutting for the tiny scale structural surface is realised by using the turbulence wall effect of SAF. Dynamical model of SAF is established based on liquid-solid two-phase flow coupling theory. Semi-annular flow passage is taken as the research object, and turbulent parameters with different flow passages are analysed by using standard k-ε turbulent model and discrete phase model (DPM), which is used for describing the influence to turbulent state caused by different boundary conditions, meanwhile, the optimisation design of finishing parameters can be obtained. Finishing platform is constructed, and finishing experiment results show that with the SAF method, the roughness machined is less than Ra 62 nm.

Keywords: mould surfaces; structural surfaces; precision finish machining; softness abrasive flow; SAF; numerical simulation; turbulence control; surface quality; abrasive flow machining; AFM; dynamical modelling; two-phase flow; turbulent modelling; discrete phase model; surface roughness.

DOI: 10.1504/IJAT.2016.081339

International Journal of Abrasive Technology, 2016 Vol.7 No.4, pp.284 - 293

Received: 15 Sep 2015
Accepted: 20 Mar 2016
Published online: 05 Jan 2017 *

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