608 Deposition of Lubricant Layer during Finishing Process by Electrical Discharge Machining with Molybdenum Disulfide Powder Suspended in Working Fluid

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This paper deals with a deposition method of lubricant during finishing electrical discharge machining (EDM) to produce parts for ultrahigh vacuum such as space environment. EDM with powder suspended in working oil has been widely used to smooth a surface and to deposit a hard layer. In this study, a solid lubricant, molybdenum disulfide (MoS_2) powder was mixed in working oil to deposit lubricant layer on carbon steel and stainless steel. MoS_2 was deposited well under the electrical conditions of a high open circuit voltage, a small discharge current, a short pulse duration and a medium pulse interval. Smoother surface could be obtained by adding aluminum powder to the mixture of MoS_2 powder and working oil. In a friction test, a surface finished with a mixture of MoS_2 and working oil had a smaller friction coefficient than that with normal working oil.
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