Abstract
The authors developed Whirling Electrical Discharge Texturing (WEDT) in order to reduce friction coefficient of cylinder-shaped parts. In previous research, the authors verified fundamental characteristics of WEDT by observation of textured surface. It was found that a crater shape and texture-area ratio can be controlled by WEDT. The texture-area ratio depends on feed speed of tool electrode. In this research, crater depth, crater diameter, texture area ratio and total removal volume of craters were investigated to confirm characteristics of WEDT in detail. In addition, tungsten wire was used as a whirling shaft in order to improve stability of whirling phenomenon. Moreover, a textured surface was finished by lapping-film in order to remove protrusions around craters and reduce friction coefficient. As a result, it was verified that the texture-area ratio slightly increased with decreasing feed speed and it was confirmed that crater depth, crater diameter, and total removal volume of craters were also related to feed speed.
Highlights
Energy problems become an international concern since world’s fossil fuel reserves are limited
For example in transport machinery, energy efficiency can be improved by decreasing surface roughness and friction coefficient [1,2]
The following conclusions are obtained from the texturing experiment by Whirling Electrical Discharge Texturing (WEDT) method
Summary
Energy problems become an international concern since world’s fossil fuel reserves are limited. For example in transport machinery, energy efficiency can be improved by decreasing surface roughness and friction coefficient [1,2]. Cutting is difficult to process on high hardness material surface and laser beam machining is difficult to process on inner surface of cylindrical part. Lots of bearing with high hardness material and small diameter are used in the transport machinary, an effective process is required. EDM is a manufacturing process which is able to process a high hardness material and small diameter parts. The authors developed Whirling Electrical Discharge Texturing (WEDT) for high efficient texturing technique on the component surface of transport machinery. In order to reduce friction coefficient, textured surface with low surface roughness is required on parts [7]. Finishing process with lapping-film is needed after texturing with WEDT
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