Efficient dressing of the wheel in ELID grinding by controllable voltage with force feed back

Electrolytic in-process dressing (ELID) grinding is a new method for achieving ultraprecision surface on hard and brittle materials. In ELID grinding, pulsed direct current voltage is applied on the metal-bonded diamond wheels to ensure constant protrusion of sharp cutting grits throughout the grinding cycle. The peak dressing voltage is kept constant irrespective of the wheel sharpness in conventional ELID grinding, which may lead to overdressing of the grinding wheel. Grinding force ratio (which is also known as K value) is an indicator for the grit sharpness. In this paper, a new approach of wheel dressing has been proposed where the peak dressing voltage is varied according to the change in the K value during grinding. A Kistler three-component dynamometer has been used to monitor the grinding force ratio in real time for this purpose. The methodology to implement the new “dressing-on-demand” concept has been discussed thoroughly in this paper. The experimental comparison with the conventional ELID grinding has also been carried out to prove the advantages of the proposed system.

[1]  T. Nakagawa,et al.  Mirror Surface Grinding of Silicon Wafers with Electrolytic In-Process Dressing , 1990 .

[2]  Jun Qu,et al.  A wavelet-based methodology for grinding wheel condition monitoring , 2007 .

[3]  Ichiro Inasaki,et al.  Tribology of Abrasive Machining Processes , 2004 .

[4]  N. Suh,et al.  Abrasive wear mechanisms and the grit size effect , 1979 .

[5]  H. Ohmori,et al.  Ultra-precision grinding of structural ceramics by electrolytic in-process dressing (ELID) grinding , 1996 .

[6]  A. Senthil Kumar,et al.  A fundamental study on the mechanism of electrolytic in-process dressing (ELID) grinding , 2002 .

[7]  Jae-Seob Kwak,et al.  Detection of dressing time using the grinding force signal based on the discrete wavelet decomposition , 2004 .

[8]  E. Rabinowicz,et al.  Friction and Wear of Materials , 1966 .

[9]  D. J. Stephenson,et al.  A study on ELID ultra precision grinding of optical glass with acoustic emission , 2006 .

[10]  T. Nakagawa,et al.  Utilization of Nonlinear Conditions in Precision Grinding with ELID (Electrolytic In-Process Dressing) for Fabrication of Hard Material Components , 1997 .

[11]  Tanveer Saleh,et al.  Development and performance evaluation of an ultra precision ELID grinding machine , 2007 .

[12]  Ioan D. Marinescu,et al.  Grinding of Ceramic Coatings with Cast Iron Bond Diamond Wheels. A Comparative Study: ELID and Rotary Dresser , 2001 .

[13]  T.M.A. Maksoud,et al.  Monitoring of the condition of diamond grinding wheels using acoustic emission technique , 2000 .

[14]  N. Cook,et al.  The Wear of Grinding Wheels: Part 1—Attritious Wear , 1971 .

[15]  B. P. Bandyopadhyay,et al.  Efficient and stable grinding of ceramics by electrolytic in-process dressing (ELID) , 1997 .

[16]  F. Rehsteiner,et al.  ECD (Electrochemical In-Process Controlled Dressing), a New Method for Grinding of Modern High-Performance Cutting Materials to Highest Quality , 1999 .

[17]  Seong-Wook Hong,et al.  Monitoring of Grinding Wheel Wear in Surface Grinding Process by Using Laser Scanning Micrometer , 2001 .

[18]  Muhammad Ekhlasur Rahman,et al.  Tool-based nanofinishing and micromachining , 2007 .