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Monitoring of tool wear in turning operations using vibration measurements
Dissertation (M Eng (Mechanical Engineering))--University of Pretoria, 2006.
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University of Pretoria
2013
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| _version_ | 1867613463295033345 |
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| access_status_str | Open Access |
| author2 | Heyns, P.S. (Philippus Stephanus) |
| author_browse | Heyns, P.S. (Philippus Stephanus) |
| author_facet | Heyns, P.S. (Philippus Stephanus) |
| collection | Thesis |
| dc_rights_str_mv | © 1999, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (M Eng (Mechanical Engineering))--University of Pretoria, 2006. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/30483 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:36:32.683Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/30483 Monitoring of tool wear in turning operations using vibration measurements Heyns, P.S. (Philippus Stephanus) upetd@up.ac.za Scheffer, Cornelius Machine tools strain gages Machine tools testing Machine tools vibration measurement Wear design engineering UCTD Dissertation (M Eng (Mechanical Engineering))--University of Pretoria, 2006. This study investigates the use of vibration and strain measurements on machine tools in order to identify the propagating wear of the selected tools. Two case studies are considered, one of which was conducted in the plant of a South African piston manufacturer. The purpose of the ftrst case study was to investigate the feasibility of vibration monitoring to identify tool wear, before attempting to implement a monitoring system in the manufacturing plant. During this case study, data from a turning process was recorded using two accelerometers coupled to a PL202 real time FFT analyser. Features indicative of tool wear were extracted from the sensor signals, and then used as inputs to a Self-Organising Map (SOM). The SOM is a type of neural network based on unsupervised learning, and can be used to classify the input data into regions corresponding to new and worn tools. It was also shown that the SOM can also be used very efficiently with discrete variables. One of the main contributions of the second case study was the fact that a unique type of tool was investigated, namely a synthetic diamond tool specifically used for the manufacturing of aluminium pistons. Data from the manufacturing of pistons was recorded with two piezoelectric strain sensors and a single accelerometer, all coupled to a DSPT Siglab analyser. A large number of features indicative of tool wear were automatically extracted from different parts of the original signals. These included features from time and frequency domain data, time series model coefficients as features and features extracted from wavelet packet analysis. A correlation coefficient approach was used to auto-lJUltically select the best features indicative of the progressive wear of the diamond tools. The SOM was once again used to identify the tool state. Some of the advantages of using different map sizes on the SOM were also demonstrated. A near 100% correct classification of the tool wear data was obtained by training the SOM with two independent data sets, and testing it with a third independent data set. It was also shown that the monitoring strategy proposed in the second case study can be fully automated and can be implemented on-line if the manufacturer wishes to. Some of the contributions of this study are the use of the SOM for tool wear classification, and conclusions regarding the wear modes of the synthetic diamond tools. Mechanical and Aeronautical Engineering unrestricted 2013-09-07T19:11:10Z 2006-12-21 2013-09-07T19:11:10Z 2000-04-20 2006-12-21 2006-12-21 Dissertation Scheffer, C 1999 Monitoring of tool wear in turning operations using vibration measurements, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/30483 > H232/ag http://hdl.handle.net/2263/30483 http://upetd.up.ac.za/thesis/available/etd-12212006-110642/ © 1999, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Machine tools strain gages Machine tools testing Machine tools vibration measurement Wear design engineering UCTD Monitoring of tool wear in turning operations using vibration measurements |
| title | Monitoring of tool wear in turning operations using vibration measurements |
| title_full | Monitoring of tool wear in turning operations using vibration measurements |
| title_fullStr | Monitoring of tool wear in turning operations using vibration measurements |
| title_full_unstemmed | Monitoring of tool wear in turning operations using vibration measurements |
| title_short | Monitoring of tool wear in turning operations using vibration measurements |
| title_sort | monitoring of tool wear in turning operations using vibration measurements |
| topic | Machine tools strain gages Machine tools testing Machine tools vibration measurement Wear design engineering UCTD |
| url | http://hdl.handle.net/2263/30483 http://upetd.up.ac.za/thesis/available/etd-12212006-110642/ |