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Article
Experimental Investigation of Wire EDM Process Parameters on Heat Affected Zone

Author: V.N. Najm
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 1 Part (A) Engineering Pages: 46-54
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

It is vital to study the impact of heat since it has an unwanted phenomenon on the operating life of parts produced, which is in turn effect the cost of production. when dimension accuracy is the primary function Wire cut machining comprehensively used specially when machining hard metal by using precisely controlled sparks that occur between a very thin wire and a workpiece in the presence of a dielectric fluid. The aim of this research is to study the effects of some Wire Electrical Discharge Machining (WEDM) variables on heat affected zone, white layer and Surface Roughness (SR) of high speed steel using ANOVA method to analyze the behavior of control parameters such as pulse on time (μs), current and wire tension. Experimental investigations separates into two main parts in the first one the wire electrical discharge machining process was accomplished on smart EDM (Electra wire cut machine), and in the second part the roughness of the machined samples surface was tested and the samples were prepared to be measured. The results shows that the heat affected zone and the white layer are affected with the risen of the current and pulse on time values more than the risen in wire tension values, as well as the wire tension affects the surface roughness more than the current and pulse on time.


Article
Surface Roughness Evaluation in WEDM Using Taguchi Parameter Design Method

Authors: S.H. Aghdeab --- V.N. Najm --- A.M. Saleh
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 1 Part (A) Engineering Pages: 60-64
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Machining of hard metal is difficult by conventional method to obtain high accuracy where the dimensional accuracy is the main factor. Wire electrical discharge machining (WEDM) extensively used, which is mostly used in machining of conductive materials by using precisely controlled sparks that occur between a very thin wire and a workpiece in the presence of a dielectric fluid. This study serves in studying surface roughness (SR) of high speed steel (HSS) using taguchi method to design the experiment, this was achieved with utilizing different wire cut machining parameters and study the behavior of these control parameters such as pulse duration (μs), pulse interval (μs), Servo feed and Servo voltage (V) on surface roughness. It can be noticed that when servo voltage and servo feed increase the surface roughness decreases and when pulse duration and pulse interval increase the surface roughness increases too, and It was found with using taguchi parameter design that the best machining variables of combination setting is Servo Voltage (22) volts, Pulse on time (110) μs, servo feed (450) mm/min and Pulse off time (30) μs to reach to the minimum value of surface roughness and hence better surface finish.

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