Modelling and experimental investigation of process parameters in EDM of Si3N4-TiN composites using GRA-RSM
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- 作者：L. Selvarajan ; M. Manohar ; A. Udhaya kumar…
- 关键词：Electric discharge machining ; Surface roughness ; Radial over cut ; Taper angle ; Geometrical tolerances ; Ceramic composites
- 刊名：Journal of Mechanical Science and Technology
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：31
- 期：1
- 页码：111-122
- 全文大小：
- 刊物类别：Engineering
- 刊物主题：Mechanical Engineering; Vibration, Dynamical Systems, Control; Industrial and Production Engineering;
- 出版者：Korean Society of Steel Construction
- ISSN：1976-3824
- 卷排序：31
文摘
Electric discharge machining (EDM) is a highly promising machining process of ceramics. This research is an out of the paradigm investigation of EDM on Si3N4-TiN with Copper electrode. Ceramics are used for extrusion dies and bearing balls and they are more efficient, effective and even have longer life than conventional metal alloys. Owing to high hardness of ceramic composites, they are almost impossible to be machined by conventional machining as it entirely depends on relative hardness of tool with work piece. Whereas EDM offers easy machinability combined with exceptional surface finish. Input parameters of paramount significance such as current (I), pulse on (Pon) and off time (Poff), Dielectric pressure (DP) and gap voltage (SV) are studied using L25 orthogonal array. With help of mean effective plots the relationship of output parameters like Material removal rate (MRR), Tool wear rate (TWR), Surface roughness (Ra), Radial overcut (ROC), Taper angle (α), Circularity (CIR), Cylindricity (CYL) and Perpendicularity (PER) with the considered input parameters and their individual influence were investigated. The significant machining parameters were obtained by Analysis of variance (ANOVA) based on Grey relational analysis (GRA) and value of regression coefficient was determined for each model. The results were further evaluated by using confirmatory experiment which illustrated that spark eroding process could effectively be improved.