Design & Manufacturing

Korean Society of Die & Mold Engineering (한국금형공학회)
권호 표지

Fabrication and Evaluation of Machinability of Diamond Particle Electroplating Tool for Cover-Glass Edge Machining

커버 글래스 엣지 가공을 위한 다이아몬드 입자 전착 공구 제작 및 가공성 평가

  • Received : 2017.02.24
  • Accepted : 2017.03.24
  • Published : 2017.03.31
Download PDF
⟨ Previous Next ⟩

Abstract

In these days, due to generalization of using smart mobile phone and wearable device such as smart watch, demand of Cover-glass and touch screen panel for protecting display increases. With increasing the demand of Cover-glass, slimming technique is promising for weight lightening, zero bezel. Cover-glass produced by this technique is required to decreasing thickness with increase strength. In the Cover-glass manufacturing process, mechanical processing and chemical processing has improve in the strength. Generally, Diamond electrodeposition wheel is used in mechanical process. Reinforced glass with the characteristics of the brittle and high hardness was manufactured by using a diamond electrodeposition wheel. At this time, Because of surface of the tool present non-uniform distribution of diamond particle, it has generate Loading of wheel and it has been decrease life of grinding tool, efficiency of grinding, quality and shape accuracy of workpiece. Thus Research is needed to controling particle distribution of diamond electrodeposition wheel uniformly. And it is necessary to study micro hole machining such as proximity senser hole, speaker hole positioned Cover-glass. Reinforced glass with the characteristics of the brittle and high hardness is difficult to machining. Processing of reinforced glass have generated wear of tool, micro cracks. Also, it is decreasing shape accuracy. In this paper, We conducted a study on how to control particle distribution uniformly about the diamond tool manufactured using elecetodeposition processing. It analyzed the factors that affect the arrangement of the particles in the electrodeposition process by design of experiment. And There is produced the grinding tool, which derives an optimum deposition conditions, for processing Cover-glass edge and the machinability was evaluated.

Keywords

References

  1. Mohajerani, A., Spelt, J. K., "edge Chipping of Borosilicate glass by Blunt Indentation," Mechanics of Materials, 42(26), pp.1064-1080, 2010. DOI: http://dx.doi.org/10.1016/j.mechmat.2010.10.002
  2. Neauport, J., Ambard, C., Bercegol, H., Cahuc, O., Champreux, J. P., Charles, J. L., Cormont, P., Darbois, N., Darnis, P., and Destribats, J., Fargin, E., lordanoff, I, Laheurte, R., Lamaignere, L., Legros, P., Mercier, R., and Pilon, F. Optimizing Fused Silica polishing Processes for 351nm High-Power Laser Application, Proc. SPIE 7132, 71321I-71321I-7.
  3. Neauport J., Ambard, C., Cormont, P, Darbois, N., Destribats, J., Luitot, C., and Rondeau, O. Subsurface Damage Measurement of Ground Fused Silica Parts by HF Etching Techniques, Optics Express, vol. 17, Issue. 22, pp. 20448-20456, 2009. https://doi.org/10.1364/OE.17.020448
  4. Bing Gue., et al, Precision grinding of optical glass with laser micro-structured coarse-grained diamond wheels., Journal of Materials Processing Technology, 2014
  5. Cho, J. H., Park, S. H., An, B. S., Lee, J. C., A Study on Design Improvement by Vibration Analysis of Hardned Glass & Sapphire Machining Equipment for Smart IT Parts, Industry, 2016
  6. Molinari, A., and Marchetti, F., Study of the Diamond-Matrix Interface in Hot-pressed Cobalt-based Tools, Materials Science and Engineering, 1990
  7. Steven W., Diamond retention in sintered cobalt bonds for stone cutting and drilling, Diamond and Related Materials, pp. 2043-2052, 1990.
  8. Else B., Jiping C., and Dinesh K., Developnent of Titanium Coatings on Particulate Diamond, pp. 2016-108, 2000.
  9. Guglielmi, N., Kinetics of the Deposition of Inert Particles from Electrolytic Bath, Journal of Electrochemical Society, Vol. 119, No. 8, pp. 1009-1012, 1972. https://doi.org/10.1149/1.2404383
  10. Celis, J. P., Roos, J. R., and Buelens, C. A Mathematical Model for the Elecrolytic Codeposition of Particles with a Metallic Matrix, Journal of Electrochemical Society, Vol. 134, No. 6, pp. 1402-1408, 1987. https://doi.org/10.1149/1.2100680
  11. Hong, K. M., Kim, M. S., and Chung, J. G. Study on the Surface Characteristics of the Nickel Film Electroplated by Supercritical Nano-Plating Method, Applied Chemistry, Vol. 7, No. 2, pp. 679-682, 2003.
  12. Sung, C. M., Brazed diamond grid: a revolutionary design for diamond saws, 1999.
  13. ASTM. Standard Test Methods for Strength of glass by Flexure (Determination of Modulus of Rupture), ASTM C-158-02. ASTM, West Conshohocken, PA, 2007.