Surface Finishing of Electrically Conductive Diamond Tools by Electrolytic Machining

Abstract:

This paper deals with a new surface finishing method of electrically conductive diamond materials by making efficient use of an electrically conductive nature of the workpiece material, instead of conventional methods such as grinding, lapping and polishing using diamond abrasives. The authors focused on the electrolytic machining method and not on the electro discharge machining method for the two advantageous features of the electrolytic machining in addition to the general view that a better surface roughness could be obtained. One of those features is that no higher heat is generated at the machining point. This can eliminate a risk of the film delamination in the case where a workpiece is the CVD diamond coated tool. The other is that a wider machining gap is available between an electrode and a workpiece. This was thought to allow the electrolytic machining to be applied to a tool with a complex shape such as a drill and an endmill. Based on these concepts, electrolytic machining experiments were conducted on the electrically conductive diamond materials. From the results, it was found that the surface of the electrically conductive diamond could be smoothened enough by electrolytic machining though relatively long period of time was required.

• Periodical: Advanced Materials Research (Volume 565)
• Pages: 400-405
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.565.400
• Online since: September 2012
• Authors: Manabu Iwai, Kiyoshi Suzuki
• Keywords: CVD Diamond Film, Diamond Tool, Electrically Conductive Diamond, Electrolytic Machining, PCD, Surface Finishing

References

[1] H. Hanyu, M. Saitoh, Y. Murakami, Y. Fukui, H. Ryu: Machining of Metal Matrix Composite using finely crystallized diamond coating cutting tools, Proceedings of JSME annual meeting III (2011) p.287. (in Japanese).

DOI: 10.1299/jsmemecjo.iii.01.1.0_287

[2] M. Iwai, K. Suzuki, T. Uematsu, N. Yasunaga, S. Miyake: A study on dynamic friction polishing of diamond. 1st report: Application to polishing of single crystal diamond, Journal of JSAT, Vol. 46, No. 2 (2002) p.82. (in Japanese).

DOI: 10.4028/www.scientific.net/kem.238-239.235

[3] N. Furushiro, M. Higuchi, T. Yamaguchi, S. Shimada, K. Obata: Polishing of single point diamond tool based on thermo-chemical reaction with copper, Precision Engineering, 33-4 (2009) p.486.

DOI: 10.1016/j.precisioneng.2009.01.004

[4] K. Suzuki, M. Iwai, et al.: A Study to Use the Electrically Conductive CVD Diamond as Electrodes in Electrical Discharge Machining, Key Engineering Materials Vols. 257-258, Advances in Abrasive Technology VI (2004) p.535.

DOI: 10.4028/www.scientific.net/kem.257-258.535

[5] S. Sano, M. Iwai, T. Uematsu, K. Suzuki: Application of Polycrystalline Diamond (PCD) to EDM. 1st Report: EDM properties of diamond-based composite electrode, Journal of JSEME, Vol. 42, No. 100 (2008) p.65. (in Japanese).

DOI: 10.2526/jseme.42.65

[6] M. Iwai, S. Ninomiya, K. Suzuki, et al.: Development of EC-PCD and its wear characteristics, Proceedings of JSPE spring conference (2010) p.499. (in Japanese).