Informatics Publishing Limited

H. Lalchhuanvela ¹, B. Doloi ¹, B. Bhattacharya ¹

Affiliations
1 Production Engg. Dept., Jadavpur University, Kolkata, IN

Abstract

Ultrasonic machining is a material removal process which does not depend on a conductive workpiece and is preferable for machining workpieces with low ductility and hardness above 40 HRC such as engineering ceramics etc. Material removal mechanism includes impacting, hammering and cavitations. Unlike other non-traditional processes such as laser beam machining, electrical discharge machining, etc., ultrasonic machining does not thermally damage the workpiece and it avoids the significant level of residual stresses which are important for the survival of brittle materials in service. In this paper, the fundamental principles of ultrasonic machining and its combinations with other processes, the material removal mechanisms and the effects of the operating parameters on material removal rate, tool wear rate are reviewed with emphasis on engineering ceramics.

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A. Manna ¹, B. Bhattacharya ²

Affiliations
1 Mech. Engg. Deptt., Punjab Engineering College, Chandigarh-160012, IN
2 Production Engineering Department, Jadavpur University, Kolkata-700032, IN

Abstract

In this investigation, Taguchi method is used to optimize the CNC-Wire cut-EDM parameters for effective machining of Ai-SiC MMC. From experimental results and through analysis of variance (ANOVA) and 'F' test values the significant factors are determined for surface roughness. Mathematical model relating to the machining performance criteria e.g. surface finish is established using Gauss elimination method for effective machining of AI/SiC-MMC. Confirmation test results show that the developed mathematical model is appropriate for effective machining of AI/SiC-MMC and the determined optimal combination of CNC-Wire cut-EDM parameters can also satisfy the real requirement in practice.

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A. Manna ¹, B. Bhattacharya ²

Affiliations
1 Mech. Engg. Department, Punjab Engineering Coilege, Chandigarh -160012, IN
2 Production Engineering Department, Jadavpur University, Koikata-700032, IN

Abstract

In the experimental study, Taguchi method, a powerful tool in the design of experiment is used to optimize the parametric combination of CNC-Wire cut-EDM for effective machining of Al-SiC MMC. From experimental results and through analysis of variance (ANOVA) the significant factors are determined for favorable gap current (Ig). Mathematical model relating to the gap current is established using Gauss elimination method for effective machining of AI/SiC-MMC. Confirmation test results show that the developed mathematical model is appropriate for effective machining of AI/SiC-MMC and the determined optimal combination of CNC-Wire cut-EDM parameters can also satisfy the real requirement in practice.

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