Elaboration and Optimization of Pellets Used for Precise Glass Grinding

Authors: N. Belkhir, A. Chorfa, D. Bouzid

Abstract:

In this work, grinding or microcutting tools in the form of pellets were manufactured using a bounded alumina abrasive grains. The bound used is a vitreous material containing quartz feldspars, kaolinite and a quantity of hematite. The pellets were used in glass grinding process to replace the free abrasive grains lapping process. The study of the elaborated pellets were done to define their effectiveness in the grinding process and to optimize the influence of the pellets elaboration parameters. The obtained results show the existence of an optimal combination of the pellets elaboration parameters for each glass grinding phase (coarse to fine grinding). The final roughness (rms) reached by the elaborated pellets on a BK7 glass surface was about 0.392 μm.

Keywords: Abrasive grain, glass, grinding, pellet.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1332186

References:

[1] P. Paul Hed and F.David "Edwards Relationship between subsurface damage depth and surface roughness during grinding of optical glass with diamond tools," Applied Optics, vol.26 (13), pp. 2491-2491, 1987.
[2] D. F. Edwards, P. Paul Hed, "Fabrication technology. 1: Fine grinding mechanism using bound diamond abrasives," Applied Optics, Vol. 26 (21), pp. 4670-4676, 1987.
[3] Yu.D.Filatov, V.V.Rogov," Feature of a glass polishing process using a tool with bonded polishing powder," J.O.S.A., vol.74 (6), pp. 727-730, 1993.
[4] F. K. Aleinikov, "The effect of certain physical and mechanical properties on the grinding of brittle materials," Sov. J. Tech. Phys., vol.27,pp. 2529-2538, 1957.
[5] D.S. Anderson, M.E. Frogner, "A method for the evaluation of subsurface damage," in Technical Digest of the Optical Fabrication and Testing Workshop (Optical Society of America, Washington DC), 1985.
[6] S. V. Kryukova, V. V.Bondar, "Effect of Degree of Vacuum in Grindability of Optical Glasses," Sov. J. Opt. Technol. vol.49, p.32, 1982.
[7] F.W. Preston," Chemical and physico-chemical reactions in the grinding and polishing of glass", J. Soc. Glass Technol. vol. 14, p.127, 1923.
[8] I.Demirci, S. Mezghani, M. El Mansori,"On the removal shaping of the glass edges:Forces analyses, surface topography and damage mechanism," Tribol. Let, vol. 30, pp.141-150, 2008.
[9] S.Malkin," Grinding Technology: Theory and Applications of Machining with Abrasives," Dearborn, Michigan: Society of Manufacturing Engineers, 1989.
[10] V.C. Venkatesh et al.," The novel bondless wheel, spherical glass chips and a new method of aspheric generation," J. Mater. Process.Tech. vol.167, pp. 184-190, 2005.
[11] Y.Desmars, S.Margerand," Rappel sur le fa├ºonnage du verre. Rapport technique," Centre de Développement Industriel Saint-Gobain Glass Thourotte,1994.
[12] S.Tong, S.M. Gracewski, P.D.Fukenbush,,"Measurement of the Preston coefficient of resin and bronze bond tools for deterministic microgrinding of glass," Prec. Eng. vol.30, pp. 115-112, 2006.
[13] S.Y.Luo, Y.Y. Tsai, C.H.Chena," Studies on cut-off grinding of BK7 optical glass using thin diamond wheels," J. Mater. Process. Tech, vol.173, pp. 321-329, 2006.
[14] N.Belkhir, D.Bouzid, V.Herold,"Correlation between the surface quality and the abrasive grains wear in optical glass lapping," Tribol. Int, vol.40, pp. 498-502, 2007.
[15] W.König, N.Koch,"Grinding of optical glasses with cup wheels," Glastechn.Ber., vol.62,p.358,1989.
[16] D.Bouzid et al., "Investigation of cerium oxide pellets for optical glass polishing," Glass Tech. vol.42,No.2, pp.60-62, 2001.