A study to achieve a fine surface finish in Wire-EDM

Liao, Yi‐Hung; Huang, Jian-Sheng; Chen, Y.H

doi:10.1016/j.jmatprotec.2003.10.034

Cited by 153 publications

(64 citation statements)

References 7 publications

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“…Many Wire-EDM machines have adopted the pulse generating circuit using low power for ignition and high power for machining. However, it is not suitable for finishing process since the energy generated by the high-voltage sub-circuit is too high to obtain a desired fine surface, no matter how short the pulse-on time is assigned [6].As newer and more exotic materials are developed, and more complex shapes are presented, conventional machining operations will continue to reach their limitations and the increased use of wire EDM in manufacturing will continue to grow at an accelerated rate [7]. …”

Section: A Material: Incoloy 825mentioning

confidence: 99%

Experimental Study on the Effects of Process Parameters on MRR in Incoloy 825 using Wire EDM Process

Shiyas¹

2018

IJRASET

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Incoloy 853 is the latest version of super alloy in Incoloy series with improved corrosion resistance, mechanical properties and weldability. So, it is preferred for wide range of application like chemical processing, oil and gas, nuclear fuel reprocessing, acid production, pulp and paper production industry etc. This project deals with the experimental study on the effects of various process parameters of WEDM like pulse on time ( I. INTRODUCTIONWire Electrical discharge machining (WEDM) is a non-traditional, thermoelectric process which wear away material from the work piece by a series of discrete sparks between a work and tool electrode submerged in a liquid dielectric fluid (Soft water (D.M Water) + Gel). These electrical discharges melt and vaporize minute amounts of the work material, which are then ejected and flushed away by the dielectric. The schematic representation of the WEDM cutting process is shown in Figure 1. Wire electrical discharge machining (WEDM) is a specialized thermal machining process capable of accurately machining parts with varying hardness or complex shapes [3]. At present, WEDM is a wide spread technique used in industry for highprecision machining of all types of conductive materials such as metals, metallic alloys, graphite, or even some ceramic materials, of any hardness. As newer and more exotic materials are developed, and more complex shapes are presented, conventional machining operations will continue to reach their limitations and the increased use of wire EDM in manufacturing will continue to grow at an accelerated rate. As an alloying element, Cr has very significant effects on the metallurgical aspect of the martensite stainless steels. Cr and C are specifically added to steel to ensure the formation of the super alloys (INCOLOY 825) after the hardening. Ni can be added, and it enhances both the yield strength and ductility of these alloys. The present study highlights the effects of various process parameters of WEDM like pulse on time (P ON), pulse off time (P OFF), peak current (IP) and wire feed (WF) have been investigated to reveal their impact on material removal rate on Incoloy 825 using one variable at a time approach.

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Section: A Material: Incoloy 825mentioning

confidence: 99%

Experimental Study on the Effects of Process Parameters on MRR in Incoloy 825 using Wire EDM Process

Shiyas¹

2018

IJRASET

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“…The author concluded that the experimental results can be used in industry in order to select the best suitable parameter combination to get the required surface roughness values for the products. Also in Liao et al (2004), in order to obtain good surface roughness, the traditional circuit using low power for ignition is modified for machining as well. With the assistance of Taguchi quality design, ANOVA and F-test, machining voltage, current-limiting resistance, type of pulse-generating circuit, and capacitance are identified as the significant parameters affecting the surface roughness in finishing process.…”

Section: An Overview Of Advances In the Research Of Wedmmentioning

confidence: 99%

A Review on Advances in Wire Electrical Discharge Machining

Patil

Waghmare

2014

Lecture Notes in Mechanical Engineering

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Wire electrical discharge machining has become an important nontraditional machining process, as it provides an effective solution for producing components made of difficult-to-machine materials such as titanium, zirconium and intricate shapes, which are not possible by conventional machining methods. Due to large number of process parameters and responses, lots of researchers have attempted to optimize the process parameters. This paper reviews the advances in research of WEDM on relation between different process parameters, include pulse-on time, pulse-off time, servo voltage, peak current, dielectric flow rate, wire speed, wire tension on different process responses include material removal rate (MRR), cutting speed (Vc), surface roughness (Ra), and wire wear ratio (WWR) of the wire electrode. Effect of composition of material on the manufacturability of wire EDM has also been reviewed. And at last, wire failure analysis is discussed.

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“…A large discharging energy usually causes violent sparks and results a deeper erosion crater on the surface. Accompanying the cooling process after the spilling of molten metal, residues remain at the periphery of the crater to form a rough surface (Liao et al, 2004). Theoretical model for R y or R max was developed for transistorized pulse generator type EDM (Chen and Mahdivian, 2000).…”

Section: Surface Roughnessmentioning

confidence: 99%

“…On the other hand, EDM of high speed steel showed that with the increase of current, R a increased and with the increase of pulse duration it decreased (Lin et al, 2006). It was suggested to use low conductive or higher resistive dielectric to ensure low R a and R y (Liao et al, 2004). Use of rotating electrode was helpful for high shape accuracy and higher MRR but it caused higher surface roughness (Her and Weng, 2001).…”

Section: Surface Roughnessmentioning

confidence: 99%