2026-09-19T23:46:25Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/552182022-01-13T07:54:36Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
Jung-Hoon Chun.
Imani Nejad, Mohammad
Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
Massachusetts Institute of Technology. Department of Mechanical Engineering
2010-05-25T21:05:52Z
2010-05-25T21:05:52Z
2009
2009
http://hdl.handle.net/1721.1/55218
611902556
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2009.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 49).
Inefficiencies in a Rockwell hardness test block manufacturing process were analyzed. The polishing stage was identified to be the bottleneck with a high reworking rate. An understanding based on the physics of polishing was the first step. Then a DOE analysis was implemented to find the optimum parameters of polishing process. A range of solutions were implemented and improvements were observed. Adding compliance, introducing two stages of polishing and using a different pad and slurry were key elements in improving the polishing process. Various quality control factors were assessed. Early analysis of those optimized parameters appeared promising; where the average polishing cycle times for brass and steel were reduced from 20 minutes to less than 2 minutes and 4 minutes, respectively. Meanwhile the quality of surface finish was improved significantly.
by Mohammad Imani Nejad.
M.Eng.
49 p.
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by
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http://dspace.mit.edu/handle/1721.1/7582
Mechanical Engineering.
Improving the polishing process for Rockwell hardness test block
Thesis
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<Abstract>Inefficiencies in a Rockwell hardness test block manufacturing process were analyzed. The polishing stage was identified to be the bottleneck with a high reworking rate. An understanding based on the physics of polishing was the first step. Then a DOE analysis was implemented to find the optimum parameters of polishing process. A range of solutions were implemented and improvements were observed. Adding compliance, introducing two stages of polishing and using a different pad and slurry were key elements in improving the polishing process. Various quality control factors were assessed. Early analysis of those optimized parameters appeared promising; where the average polishing cycle times for brass and steel were reduced from 20 minutes to less than 2 minutes and 4 minutes, respectively. Meanwhile the quality of surface finish was improved significantly.</Abstract>
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