Electro-Chemical Grindings (ECG)
In this article, we will learn about Electro Chemical Grinding, Working Principle Advantage & Disadvantage. Electrochemical grinding is shown in the figure. This is also known as electrolytic grinding. 90% of the metal is removed from the workpiece by electrochemical and 10% by abrasive grinding.
Working Principle
It has a metal bonded grinding wheel. A wheel bearing is insulated bearing. Fitted in the horizontal spindle. The workpiece is caught in the fixture and placed against the grinding wheel. There is a 0.025 mm gap between the grinding wheel and the workpiece.
The + ve terminal I workpiece of the DC supply is connected to the grinding wheel at the -ve terminal. Sodium chlorate (or) sodium chlorite mixed with water is used as an electrolyte. When the electrolyte is inserted between the workpiece and the grinding wheel, the electrochemical action occurs and the metal is ejected from the workpiece.
The metal piece is also removed from the workpiece by the grinding wheel. The electrolyte is ejected from the workpiece. The electrolyte is collected in a reservoir and filtered and re-circulated through the pump.
The electro chemical grinding metal is thus discharged in two ways. Application
Machining heavy metals that can transmit electricity. Tungsten carbide and hard steel tools can be machined.
Advantages
- This way there is no heat. Let’s work quickly.
- There will be no transformation in the workpiece.
- It is possible to do machining without a fetus.
- The grinding wheel does not rub easily.
Disadvantages
- Bonded wheels are expensive.
- Only electrically conductive metal can be machined.
- Irregularly shaped holes cannot be created.
- Rareness is caused by an electrolytic solution.
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