Non-Conventional Machining Of Si-C
Journal Title: IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) - Year 2018, Vol 15, Issue 3
Abstract
In recent years, aluminium alloy based metal matrix composites (MMC) are gaining importance in several aerospace and automobile applications. Aluminium has been used as matrix material owing to its excellent mechanical properties coupled with good formability. Addition of Si-C as reinforcement in aluminium system improves mechanical properties of the composite. In this paper, AlSi-C composite was prepared by powder metallurgy route. Powder metallurgy homogeneously distributes the reinforcement in the matrix with no interfacial chemical reaction and high localized residual porosity. Si-C particles containing different weight fractions (10 and 15 wt. %) and mesh size (300 and 400) is used as reinforcement. Though AlSi-C possess superior mechanical properties, the high abrasiveness of the Si-C particles hinders its machining process and thus by limiting its effective use in wide areas. Rapid tool wear with poor performance even with advanced expensive tools categories, it is a difficult-to-cut material. Non-conventional processes such as electrical discharge machining (EDM) could be one of the best suited method to machine such composites. Four machining parameters such as discharge current (Ip), pulse duration (Ton), duty cycle (),flushing pressure (Fp) and two material properties weight fraction of Si-C and mesh size, and four responses like material removal rate (MRR), tool wear rate (TWR), circularity and surface roughness (Ra) are considered in this paper. Taguchi method is adopted to design the experimental plan for finding out the optimal setting. However, Taguchi method is well suited for single response optimization problem. The influence of each parameter on the responses is established using analysis of variances (ANOVA) at 5% level of significance. It is found that discharge current, pulse duration, duty cycle and wt% of Si-C contribute significantly, where flushing pressure and mesh size of Si-Ccontribute least to the multiple performance characteristic index.
Authors and Affiliations
Parth Srivastava, Mohd. Ziaulhaq
Keywords
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- DOI 10.9790/1684-1503031016.
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