scholarly journals Optimization of the Electrical Discharge Machining of Powdered Metallurgical High-Speed Steel Alloy using Genetic Algorithms

2019 ◽  
Vol 4 (6) ◽  
pp. 255-262
Author(s):  
Mohd Razif Idris ◽  
Imad Mokhtar Mosrati
Keyword(s):  
Genetic Algorithms ◽  
Electrical Discharge ◽  
High Speed ◽  
Electrical Discharge Machining ◽  
High Speed Steel ◽  
Steel Alloy

A New Technology to Machine Bimetal Band Saw

2016 ◽  
Vol 861 ◽  
pp. 9-13
Author(s):  
Hong Jian Dong ◽  
Qin He Zhang ◽  
Lei Tan ◽  
Guo Wei Liu ◽  
Tuo Dang Guo
Keyword(s):  
Electrical Discharge ◽  
High Speed ◽  
Electrical Discharge Machining ◽  
New Technology ◽  
High Speed Steel ◽  
Processing Route ◽  
Grinding Process ◽  
Wire Electrical Discharge Machining ◽  
Low Carbon ◽  
Band Saw

As a kind of commonly used tools, junior hacksaw plays an important role in our daily life. A new kind of bimetal band saw taken low carbon medium alloy steel X32 as the backing material and the high-speed steel M42 as the saw tooth material is developed. In this paper, a new method to machine the bimetal band saw with wire electrical discharge machining (WEDM) is introduced. The processing route for common tooth profile is calculated. The fixture with specific angles is designed with CAD software (proe5.0) and machined with 3D printing technology. The experiments show that bimetal band saw machined with WEDM method has better surface quality compared with that machined through the traditional grinding process. Without any burrs, the new bimetal band saw is more resistant to wear and has a longer service life.

Analysis of Micro-Pin Manufacturing Using Inverse Slab Electrical Discharge Milling (ISEDM) Process

2011 ◽  
Vol 496 ◽  
pp. 247-252 ◽  
Author(s):  
Ruben Gil ◽  
J.A. Sánchez ◽  
N. Ortega ◽  
S. Plaza ◽  
B. Izquierdo ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Electrical Discharge ◽  
High Speed ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
High Speed Steel ◽  
Machining Process ◽  
Work Piece ◽  
Electrode Wear ◽  
Pulse Off Time

Abstract. This paper analyses the technological capabilities of a novel rotary (EDM) electrical discharge machining process for the manufacturing of high aspect ratio cylindrical micro-components. The process is called Inverse Electrical Discharge Grinding (ISEDM). An experimental analysis has been carried out on high speed steel (tool steel Vanadis 23), using a conventional EDM machine and graphite electrode. The effect of pulse off-time, work piece final diameter and machining length on material removal rate, electrode wear ratio, radial accuracy and surface roughness has been quantified. From the study, optimum strategies that involve the use of different EDM regimes for achieving the optimum requirements can be defined. Micro-pins of 0.3 mm diameter with aspect ratio as high as 100:1 have been successfully manufactured.

Technique of Brass Spiral Structure Deposition Using Micro EDM in Gas

2007 ◽  
Vol 329 ◽  
pp. 595-600
Author(s):  
Zhen Long Wang ◽  
Bai Dong Jin ◽  
Guo Hui Cao ◽  
Z.W. Wei ◽  
Wan Sheng Zhao
Keyword(s):  
Electrical Discharge ◽  
High Speed ◽  
Spiral Structure ◽  
Electrical Discharge Machining ◽  
Three Dimensional ◽  
High Speed Steel ◽  
Processing Parameters ◽  
Pulse Interval ◽  
Tool Electrode ◽  
External Diameter

This paper proposes a new deposition method using micro electrical discharge machining (EDM) to deposit micro spiral structure in gas. First, the basic principles of micro electrical discharge deposition (EDD) are analyzed and the realized conditions are predicted. Then with an ordinary EDM shaping machine, brass as the electrode, high-speed steel as the workpiece, a lot of experiments are carried out on the micro spiral structure deposition in air. The effects of major processing parameters, such as the discharge current, discharge duration, pulse interval, gravity and working medium, are obtained. As a result, a 19-circle micro spiral structure with 0.19mm in external diameter, 0.1mm in wire diameter and 3.39mm in height is deposited. Measurements show that the deposited material has obvious delaminating structure, the components of which depend on those of the tool electrode material, although Zn in the electrode is oxidized to ZnO. This method establishes the research basis for micro three-dimensional deposition machining.

Study of the Surface Integrity of Powder-Metallurgy High-Speed Steel (S390) Multi-Cut by Wire Electrical Discharge Machining

2013 ◽  
Vol 395-396 ◽  
pp. 1020-1025
Author(s):  
Xiang Zha ◽  
Chuan Liang Cao ◽  
Xiang Lin Zhang ◽  
Ji Jun Feng
Keyword(s):  
Residual Stress ◽  
Surface Integrity ◽  
Electrical Discharge ◽  
Retained Austenite ◽  
High Speed ◽  
Electrical Discharge Machining ◽  
White Layer ◽  
Great Influence ◽  
High Speed Steel ◽  
Wire Electrical Discharge Machining

The surface integrity of powder metallurgical high speed steel (S390) cut by wire electrical discharge machining (WEDM) has a great influence on the its fatigue life. In this paper, a study focused on surface integrity including white layer, surface finish, retained austenite, carbide and residual stress changed with multi-cutting has been described. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive spectrograph (EDS) analysis were performed in the examination of the evolution of surface integrity. The experimental results reveal that the surface roughness, micro-cracks, white layer thickness and surface residual stress decrease with the increase of cutting pass, but the amount of retained austenite in the resolidified layer of the surface after the second cutting pass is the highest, compared with the other cutting passes. The content of carbides increases with the cutting pass and few carbides appear in the top section of the white layer of the first two cutting passes.

Analysis of dry electrical discharge machining in different dielectric mediums

2015 ◽  
Vol 231 (3) ◽  
pp. 497-512 ◽  
Author(s):  
Saman Fattahi ◽  
Hamid Baseri
Keyword(s):  
Electrical Discharge ◽  
High Speed ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
High Speed Steel ◽  
Workpiece Material ◽  
Machined Surface ◽  
Dry Edm ◽  
Pulse On Time ◽  
Dry Electrical Discharge Machining

Dry electrical discharge machining (EDM) is a modification of the oil EDM process in which the liquid dielectric is replaced by a gaseous dielectric. This study investigates the effects of different types of gas (air, nitrogen, and mixture of argon/air) on the machining characteristics of dry EDM of M35 workpiece material. A Taguchi L27 orthogonal array design was applied to investigate the effects of six control factors, including current, pulse on-time, duty factor, gas pressure, electrode rotational speed and specifically type of gas on machining responses, including material removal rate (MRR), surface roughness, and radial overcut. Also, the surface integrity was investigated in different dielectric mediums. Results show that the argon/air mixture can improve the MRR with respect to air and nitrogen. The best dimensional accuracy can be obtained by using nitrogen as the dielectric medium. Also, the machined surface with nitrogen has the fewest small drops and the microcracks in Aagon/air mixture is more than those air one. So, the argon/air mixture is the best dielectric with respect to nitrogen and air mediums for dry EDM of high-speed steel M35.

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