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Machine Tool Internal Encoders as Sensors for the Detection of Tool Wear
University West, Department of Engineering Science. (Skärande bearbetning, PTW)ORCID iD: 0000-0003-1408-2249
University West, Department of Engineering Science. (PTW)ORCID iD: 0000-0002-3436-3163
University West, Department of Engineering Science, Division of Production Engineering. (Skärande bearbetning, PTW)
2012 (English)In: Procedia CIRP: 3rd CIRP Conference on Process Machine Interactions, 29-30 October 2012, Nagoya, Japan., 2012, p. 46-51Conference paper, Published paper (Refereed)
Abstract [en]

Tool wear in machining changes the geometry of the cutting edges, which effect the direction and amplitudes of the cutting forcecomponents and the dynamics in the machining process. These changes in the forces and dynamics are picked up by the internalencoders and thus can be used for monitoring of changes in process conditions. This paper presents an approach for the monitoringof a multi-tooth milling process. The method is based on the direct measurement of the output from the position encoders availablein the machine tool and the application of advanced signal analysis methods.

The paper investigates repeatability of the method developed and how to detect wear in an individual tooth in a milling cutter. Theresults of this work show that various signal features which correlate with tool wear can be extracted from the first few oscillatingcomponents, representing the low-frequency components, of the machine axes velocities. The responses from the position encodersexhibit good repeatability, especially short term repeatability while the long-term repeatability is more unreliable. A worn toothincreases the irregularity in the encoder responses and can be identified at an early stage of the cut.

Place, publisher, year, edition, pages
2012. p. 46-51
Series
Procedia CIRP, ISSN 2212-8271 ; vol 4
Keywords [en]
Tool wear detection, milling, encoder signals, repeatability, signal analysis
National Category
Engineering and Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-5078DOI: 10.1016/j.procir.2012.10.009Scopus ID: 2-s2.0-84879829011OAI: oai:DiVA.org:hv-5078DiVA, id: diva2:602524
Conference
3rd CIRP Conference on Process Machine Interactions (3rd PMI)
Available from: 2013-02-01 Created: 2013-02-01 Last updated: 2016-02-09Bibliographically approved

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Pejryd, LarsRepo, Jari

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