08-01-2013, 12:11 PM
ELECTROCHEMICAL GRINDING
ELECTROCHEMICAL.pptx (Size: 293.94 KB / Downloads: 74)
ECG introduction
It is known as Electrolytic grinding, Anodic Machining or Electrolytically Assisted Abrasive Grinding. It involves the use of a metallic grinding wheel and the process can be used for all the standard grinding operation . E.X: surface grinding, internal grinding and face grinding , etc. Grinding usually constitutes a mechanical machining process that removes small amounts of material from a metallic work piece in the form of tiny chips through the contact of small, hard, sharp, nonmetallic particles often embedded in a grinding wheel
ECG process
Electrochemical grinding (ECG) is an electrolytic material-removal process involving a negatively charged abrasive grinding wheel, a conductive fluid (electrolyte), and a positively charged work piece. The power supply unit is of D.C and provides an automatic voltage adjustment between 2 to 30V. The grinding wheel runs at a surface speed of about 1500 meters per minute.
Work piece material corrodes into the electrolyte solution. ECG is similar to electrochemical machining except that the cathode is a specially constructed grinding wheel instead of a tool shaped like the contour to be machined.
Ecg parameter
ECG Power requirements: In ECG operations, d-c power is used, usually at a potential of 2-30 V; current ranges from 50-3000 A.
Tolerances: With careful control of electrolyte temperature, specific gravity, and conductivity, it is possible to produce parts to within 0.005 mm.
application
Sharpening of carbide tips and tools.
Cutting thin sections of hard material without danger of any damage or distortion.
Burr-free sharpening of hypodermic needles.
Grinding of sup rolling turbine blades