Behavior of ECAP processed copper electrodes in electrical discharge machining of AISI H13 steel

Abstract: Electrical discharge machining (EDM) is a non-traditional process that uses the electrical spark discharge to machine electrically conducting materials for geometrically complex shapes or hard materials. In the current work, cupper and brass were used as the electrode material, and AISI H13 steel as the workpiece. Different input parameters were investigated namely: 20, 30, 40 A current, 50, 100, 150 μs pulse on time, and 1, 3, 6 mm gap. The workpiece thickness was fixed to 4 mm and the pulse off time was 25 μs. All EDM experiments were carried out in diesel oil and the voltage was 140 V. The results showed that the electrode wear decreased with increasing the pulse on time and gap and increased with increasing current for copper and brass electrode. The optimal conditions for minimum tool wear were: pulse on time 150 μs, current 20 A, and gap 6 mm for copper and brass electrodes. Electrode wear is minimum for copper at all parameter values compared to brass electrode.

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Effect of sliding speed on elevated-temperature wear behavior of AISI H13 steel

Journal of Iron and Steel Research International ◽

10.1007/s42243-021-00644-9 ◽

2021 ◽

Author(s):

Yin Zhou ◽

Wei Jiang

Keyword(s):

Elevated Temperature ◽

Wear Behavior ◽

H13 Steel ◽

Sliding Speed ◽

Aisi H13 Steel ◽

Aisi H13

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Comparison of material transfer in electrical discharge machining of AISI H13 die steel

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/09544062jmes1227 ◽

2009 ◽

Vol 223 (7) ◽

pp. 1733-1740 ◽

Cited By ~ 22

Author(s):

S Kumar ◽

R Singh ◽

T P Singh ◽

B L Sethi

Keyword(s):

Electrical Discharge ◽

Electrical Discharge Machining ◽

Tungsten Powder ◽

Material Transfer ◽

Die Steel ◽

Cent Increase ◽

Aisi H13 ◽

Copper Chromium ◽

H13 Die Steel ◽

And Tungsten

The electrical discharge machining (EDM) process is extensively used in the tool and die making industry for accurate machining of internal profiles in hardened materials. Although it is essentially a material removal process, efforts have been made in the recent past to use it as surface treatment method. This article investigates and compares the effect of material transfer from electrode bodies (copper, copper—chromium, and copper—tungsten) and tungsten powder suspended in the dielectric medium during die-sinking EDM of AISI H13 die steel. Results show a 76 per cent increase in micro-hardness by machining with a copper—tungsten electrode and a 111 per cent increase by machining with tungsten powder mixed in the dielectric. The copper—chromium electrode gives the best surface roughness (Ra) value of 2.67 μ m. Scanning electron microscopy and X-ray diffraction analysis of the machined surfaces show alloying of parent material with tungsten and tungsten carbide. Chemical composition of the machined surfaces was further checked on an optical emission spectrometer to verify the results. Besides a significant presence of tungsten, an increase in the percentage of carbon is also observed.

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