Lap grinding

ELID-lap grinding is a machining process that employs constant pressure and uses metal-bonded abrasive wheel with ELID. It produces better results for both surface roughness and flatness as compared to other grinding... 

ELID-lap grinding of silicon with JK 4000 wheel outputs a mirror-like finish at roughness of 3.8 nm, as compared with 7.4 nm roughness outputted by a conventional lap-grinding. 

ELID-lap grinding of tungsten with JIS 4000 wheel is more stable than conventional lap-grinding from the viewpoint of the stability of the removal rate value (for an 80 min period). 

Principle of ELID-lap grinding. (From Itoh, N., Ohmori, H., Moryiasu, S., Kasai, T., Karaky-Doy, T., and Bandyopadhyay, B.P., Int J Mach Tools Manuf, 38, 747,1998. With permission.)... 

ELID-lap grinding of silicon was achieved in a brittle-fracture mode for JIS 1200 and down and in a ductile mode for JIS 4000 and up. 

Material removal rate results are preser ted in Figure 9.19. ELID-lap grinding using the JIS 3,000,000 metal resin bond wheel produced very good ground surfaces of PV 2.8 mn for silicon and PV 2.5 nm for glass. 

Mechanical surface preparation shall be performed by wire brushing, grinding, buffing, and polishing when required, to remove harmful defects such as fissures, pits, gouges, folds, laps, or oxides. 

Finishing by cutting, grinding, lapping, polishing, drilling for precision parts with optimised surfaces. 

From the viewpoint of the mechanical characteristics, glass and silicon resemble each other. They have a similar mechanical hardness, are brittle as they lack plasticity and are thus prone to fracture. Of the standard precision engineering procedures available for shaping, only those that do not use a geometrically defined cutter can be used, such as grinding and lapping. Microengineering techniques are much more efficient, but they do prove difficult for deeper structures. 

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