Experimental investigation on dry EDM using helium gas dielectric
by P. Govindan; Rahul Agrawal; Suhas S. Joshi
International Journal of Manufacturing Technology and Management (IJMTM), Vol. 24, No. 1/2/3/4, 2011

Abstract: A dry EDM process uses a gaseous dielectric, as a possible substitute for liquid dielectric for precision machining. Due to fluctuations in temperature and oxidation on the dry EDMed surface, critical issues regarding this process are: 1) presence of micro-cracks on dry EDMed surface; 2) surface damage due to arcing; 3) reattachment of work material on the tool; 4) large dimensional oversize in the dry EDMed holes. This work proposes use of helium gas dielectric to effectively cool machined surfaces so as to reduce damage and improve machining accuracy. In this regard, a systematic experimentation using Taguchi L8 orthogonal array has been performed to understand the influence of processing parameters and helium gas dielectric on MRR, TWR, oversize and depth achieved. It is observed that the use of helium gas significantly reduces thermal damage on machined surfaces, and helps lower work material deposition on the tool, and the oversize in dry ED machined holes. The analysis of results show that speed (N) and current (I) are the dominant factors that influence MRR and oversize, whereas dielectric gas pressure (P) is the most significant in influencing TWR.

Online publication date: Fri, 04-May-2012

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Manufacturing Technology and Management (IJMTM):
Login with your Inderscience username and password:

    Username:        Password:         

Forgotten your password?


Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com