Electrical discharge grinding versus abrasive grinding in polycrystalline diamond machining-tool quality and performance analysis
Electrical discharge grinding (EDG) and conventional abrasive grinding are two different methods to machine polycrystalline diamond (PCD) with different removal mechanisms. This paper discussed the quality issues of PCD tools produced by the two processes. Although remarkably similar sudace roughnes...
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| Main Authors: | , , , , |
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| Format: | Article |
| Published: |
Springer
2015
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/8001/ http://eprints.uthm.edu.my/8001/1/mohammad_zulafif_rahim_U.pdf |
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| Summary: | Electrical discharge grinding (EDG) and conventional
abrasive grinding are two different methods to machine
polycrystalline diamond (PCD) with different removal mechanisms.
This paper discussed the quality issues of PCD tools
produced by the two processes. Although remarkably similar
sudace roughness and tool sharpness were obtained in both
processes, it was found that residual stress and the level of
graphitization were significantly different. In this study, residual
stress and graphitization were analyzed quantitatively with
the Raman method. Maximum compression residual stress of
1.4 GPa was recorded in the abrasively ground PCD of the
smallest grade size while minimum compression residual
stress of 0.7 GPa was found in the PCD of the biggest grade.
On the contrary, the dominant residual stress in the EDGeroded
PCDs was tensile stress and its magnitude was in the
range of 4.7 to 0.4 GPa. Through cutting tests, it was revealed
that the residual stress and graphitization influenced the wear
mechanism ofthe tool. It was also observed that abrasive wear dominated the wear pattern of the highly graphitized PCD
tools, while breakage through fracture was the main wear
mechanism for abrasively ground PCD, which has a structure
of lower-level graphitization. |
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