The Research of Machinability of Aluminum Matrix Composites
Date Issued
2010
Date
2010
Author(s)
Chang, Chuan-Jen
Abstract
An experimental investigation on the end milling of aluminum based metal matrix composites with different percentage of Al2O3 particles was conducted in this study. The machinability in terms of tool wear, surface roughness, cutting force and chip morphology was studied under different cutting settings including dry cutting, wet cutting and minimum quantity lubrication with nano fluid and the water-based fluid. The results show that flank wear occurs in dry cutting of 10 wt.% Al2O3 aluminum metal matrix, It will cause serious built-up edge, but it can be reduced by using minimum quantity lubrication with nano. The nano particles can generate a solid lubricant layer between the tool face and chips. Hence chip sticking on tool face is reduced and the surface roughness is improved. The cutting of 15 wt.% Al2O3 aluminum metal matrix causes fewer built-up edge but more serious flank wear than that of 10 wt.% Al2O3 aluminum metal matrix. Using minimum quantity lubrication with nano fluid can improve tool life and surface roughness in cutting of 15 wt.% Al2O3 aluminum metal matrix. However, the effect is the same as that of wet cutting. Using the polycrystalline diamond tool can improve flank wear under dry cutting, but micro chipping will occur in wet cutting. It is effective in cutting 10 wt.% Al2O3 and 15 wt.% Al2O3 aluminum metal matrix composites with coated carbide tool by using MQL with nano fluid, but PCD tool is better in cutting 20 wt.% Al2O3 aluminum metal matrix composites under dry cutting condition.
Subjects
aluminum matrix material
machinability
built-up edge
surface roughness
minimum quantity lubrication
nano fluid
Type
thesis
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