A study of lapping parameters to reduce polishing time of optical glass

Machining of hard and brittle material always pose problems such as rough surface, cracks, sub-surface damage and residual stress mainly due to its brittle nature. In recent year researchers and manufactures have put in of lot effort to design and fabricate highly precise device to achieve low toler...

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Main Author:	Elshwain, Amad Alddein
Format:	Thesis
Language:	English
Published:	2007
Subjects:	TJ Mechanical engineering and machinery TS Manufactures
Online Access:	http://eprints.utm.my/id/eprint/9622/1/AmadAlddeinElshwainMFKM2007.pdf
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id	my-utm-ep.9622
record_format	uketd_dc
spelling	my-utm-ep.96222018-08-26T04:50:08Z A study of lapping parameters to reduce polishing time of optical glass 2007-06 Elshwain, Amad Alddein TJ Mechanical engineering and machinery TS Manufactures Machining of hard and brittle material always pose problems such as rough surface, cracks, sub-surface damage and residual stress mainly due to its brittle nature. In recent year researchers and manufactures have put in of lot effort to design and fabricate highly precise device to achieve low tolerance, better surface finish and low sub-surface damage at reduced cost. In this study ultrasonic grinding was used to grind flat surface on the BK7 glass. Only feed rate was varied during grinding, ie. 0.5, 1.5, 2.5, and 3.5mm/min while other parameters such depth of cut (5Âµm), frequency (20kHz) and spindle speed (1000rpm) were fixed. The four ground samples were lapped at various table speeds and followed by polishing operations at fixed conditions. Surface roughness and surface morphology of the samples were evaluated after each process. It is found that surface roughness increases when the feed rate increased. Higher lapping speed (50rpm) remove material faster and fines better surface finish than lower speeds. Saturation point of surface roughness occurs at 10 minutes lapping time. The finest polishing surface achievable using less rigid machine was 38nm. It is expected lower Ra could be obtained after polishing if the same lapping and polishing machine is used for both processes. 2007-06 Thesis http://eprints.utm.my/id/eprint/9622/ http://eprints.utm.my/id/eprint/9622/1/AmadAlddeinElshwainMFKM2007.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:1076 masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery TS Manufactures
spellingShingle	TJ Mechanical engineering and machinery TS Manufactures Elshwain, Amad Alddein A study of lapping parameters to reduce polishing time of optical glass
description	Machining of hard and brittle material always pose problems such as rough surface, cracks, sub-surface damage and residual stress mainly due to its brittle nature. In recent year researchers and manufactures have put in of lot effort to design and fabricate highly precise device to achieve low tolerance, better surface finish and low sub-surface damage at reduced cost. In this study ultrasonic grinding was used to grind flat surface on the BK7 glass. Only feed rate was varied during grinding, ie. 0.5, 1.5, 2.5, and 3.5mm/min while other parameters such depth of cut (5Âµm), frequency (20kHz) and spindle speed (1000rpm) were fixed. The four ground samples were lapped at various table speeds and followed by polishing operations at fixed conditions. Surface roughness and surface morphology of the samples were evaluated after each process. It is found that surface roughness increases when the feed rate increased. Higher lapping speed (50rpm) remove material faster and fines better surface finish than lower speeds. Saturation point of surface roughness occurs at 10 minutes lapping time. The finest polishing surface achievable using less rigid machine was 38nm. It is expected lower Ra could be obtained after polishing if the same lapping and polishing machine is used for both processes.
format	Thesis
qualification_level	Master's degree
author	Elshwain, Amad Alddein
author_facet	Elshwain, Amad Alddein
author_sort	Elshwain, Amad Alddein
title	A study of lapping parameters to reduce polishing time of optical glass
title_short	A study of lapping parameters to reduce polishing time of optical glass
title_full	A study of lapping parameters to reduce polishing time of optical glass
title_fullStr	A study of lapping parameters to reduce polishing time of optical glass
title_full_unstemmed	A study of lapping parameters to reduce polishing time of optical glass
title_sort	study of lapping parameters to reduce polishing time of optical glass
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2007
url	http://eprints.utm.my/id/eprint/9622/1/AmadAlddeinElshwainMFKM2007.pdf
_version_	1747814766095630336

A study of lapping parameters to reduce polishing time of optical glass

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