An intelligent non-destructive method of monitoring and

detecting failures in machining processes is very

important. Acoustic Emission (AE) sensors has been

used as a non destructive technique in the past for crack

and wear detection in workpiece and machine tools. This

poster presents the efficacy of using AE sensor for touch

detection during probing

Obi, Stanley

English

University of Huddersfield Repository

University of Huddersfield RepositoryObi, StanleyMicro-Touch Detection Using Acoustic Emission Sensor On Inconel 718Original CitationObi, Stanley (2009) Micro-Touch Detection Using Acoustic Emission Sensor On Inconel 718. In: University of Huddersfield Research Festival, 23rd March - 2nd April 2009, University of Huddersfield. (Unpublished)This version is available at http://eprints.hud.ac.uk/5220/The University Repository is a digital collection of the research output of theUniversity, available on Open Access. Copyright and Moral Rights for the itemson this site are retained by the individual author and/or other copyright owners.Users may access full items free of charge; copies of full text items generallycan be reproduced, displayed or performed and given to third parties in anyformat or medium for personal research or study, educational or not-for-profitpurposes without prior permission or charge, provided:• The authors, title and full bibliographic details is credited in any copy;• A hyperlink and/or URL is included for the original metadata page; and• The content is not changed in any way.For more information, including our policy and submission procedure, pleasecontact the Repository Team at: E.mailbox@hud.ac.uk.http://eprints.hud.ac.uk/Micro-touch detection using Acoustic Emission Sensor on Inconel 718Introduction Data Acquisition set-up  Workpiece: cut sample of Inconel 718 A wideband AE transducer sensor with piezoelectric crystal     for capturing AE signals Preamplifier and a 2-channel PCI-2 18 bit A/D converter acquisition card used for retrieving and processing data Workpiece set-up and AE transducer sensor Preamplifier Acquisition card  PCConclusion and further work AE sensor is effective in capturing micro-touch. The surface defect caused by the touching grit is inconsequential when compared to the structural defects present in the workpiece.  Based on these experiment  and future trials, AE can be used as an efficient method of collecting datum for machine tool. Figure 2: Raw signal showing micro-touch detected by AE sensor Figure 1: White light interferometer surface topography of Inconel 718 before micro-touch  Figure 3: White light interferometer surface topography of Inconel 718 after micro-touch  Centre for Precision TechnologiesResearch student: Stanley Obi           AMTG (Advanced Machining Technology Group            Supervisors: Dr Xun ChenExperimental Procedure  Inconel 718 was polished in a two-step strategy to a fine surface finishFirst, nickel bonded abrasive was used to reduce the surface roughness of Inconel 718 from 0.4 to 0.1 micron (Sa) to remove pre-ground marks In the second step, different grit sizes of silicon carbide (SiC) paste were used to achieve a surface roughness of 42nm.    3um SiC was applied on the tool and the spindle feed at 500 rev/min at a step of 1um to the workpiece until contact is made with the workpiece The result was collected and processed.Result and Discussion There is a peak in the AE signal as contact was made between the tool and workpiece figure 2 The achieved surface roughness Sa before touch is 42nm and after touch is 53nm. Showing a difference of 11nm.The difference in the RMS value (Sq) before and after touch is insignificant. The Sq indicates the uniformity of the surface. Aim This project is aimed at identifying the sensitivity of physicalAE sensor in detecting a micro-touch on inconel 718 workpiece at a micro level in machining process. An intelligent non-destructive method of monitoring and detecting failures in machining processes is very important. Acoustic Emission (AE) sensors has been used as a non destructive technique in the past for crack and wear detection in workpiece and machine tools. This poster presents the efficacy of using AE sensor for touch detection during probing.   

Micro-Touch Detection Using Acoustic Emission Sensor On Inconel 718

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