You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    Volume 48, Issue 4 (July 2020)

    Experimental Evaluation of a Microwave Drilling Process in Perspex

    (Received 9 February 2018; accepted 25 June 2018)

    Published Online: 2018

    CODEN: JTEVAB

      Format Pages Price  
    PDF (1.20 MB) 15 $25   ADD TO CART

    Cite this document

    X Add email address send
    X
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word



    Abstract

    An attempt was made to investigate the practicability of drilling sub-millimeter holes in the low–melting-point Perspex using microwave energy. However, a complete characterization study of the microwave drilling process occurs through the characterization of the drill concentrator and the drilled hole in the Perspex specimen. In the present study, a commercial steel-alloyed drill tool has been used as a microwave concentrator and was characterized after the microwave drilling process. The key objective was to understand the capability of the drill tool in concentrating the microwave energy for effective hole drilling in Perspex specimens. A method based on mutual material interaction inside a customized applicator was employed to drill a hole in Perspex by thermal ablation. Energy dispersive spectroscopy using a field emission scanning electron microscopy was performed on a drill tool and workpiece to understand the composition variation during microwave drilling. A Dewinter optical microscope with material and software was used for macroscopic studies (Dewinter, New Delhi, India). Often, a precise weighing machine, jiffy digital clock, and fluke infrared thermometer were used for basic preparation. Thermal analyses based on thermogravimetric analysis (thermogravimetric analysis, differential thermal analyzer, and derivative thermogravimetric) were attempted in order to understand the thermal losses and heat energy influencing the performance of the microwave drilling process. Thermal characterization was carried out for the high heating rates of individual materials as well as the interaction with other materials. The results confirm the drilling of a hole at a low power (90–360 W) setting by a steel alloy drill bit concentrator. It was observed that the melting of the drill bit increased with an increase in the power beyond 180 W. A quality hole of 0.9 mm was drilled with a 0.8 mm drill bit after material characterization at optimized parametric settings.

    Author Information:

    Lautre, Nitin Kumar
    Department of Mechanical Engineering, Visvesvaraya National Institute of Technology (VNIT), Nagpur, M.S.

    Sharma, Apurbba Kumar
    Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand

    Kumar, Pradeep
    Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand

    Das, Shantanu
    Reactor Control Division, Bhabha Atomic Research Center, Mumbai,


    Stock #: JTE20180103

    ISSN:0090-3973

    DOI: 10.1520/JTE20180103

    Author
    Title Experimental Evaluation of a Microwave Drilling Process in Perspex
    Symposium ,
    Committee A01