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Shear-thickening polishing method
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DOI：10.1016/j.ijmachtools.2015.04.010.png)
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Abstract
En 中文
A shear-thickening polishing (STP) method utilizing the shear thickening mechanism of non-Newtonian power-law fluid based slurry is proposed for curved surface polishing. The SW principle and micro-material removal action are analyzed. The high-performance SW slurry with the shear-thickening rheological behaviors has been prepared. To achieve the material removal mechanism of SW process, based on the Preston formula, fluid dynamics and shear thickening mechanism, the material removal rate (MRR) model is established and the difference of MRR between theoretical and experimental results is 6.12%. The experimental and theoretical tests of SW process are conducted to investigate the influences of polishing velocity, abrasive concentration and grain size on MRR and surface roughness. Compared with Newtonian fluid slurry, SW slurry can achieve much higher MRR and better surface quality due to shear-thickening effect. MRR of Cr12Mo1V1 (die steel) is up to 13.69 mu m/h, and surface roughness is reduced from R-a 105.95 nm to R-a 5.1 nm within 0.5 h of processing. This indicates that STP is a promising processing method for precision finishing or polishing. (C) 2015 Elsevier Ltd. All rights reserved.
Keywords:
Polishing
STP
Shear-thickening effect
Non-Newtonian fluid
Material removal model
Curved surface
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