Electrochemical grinding

NationalInstituteofScience&TechnologyB.Tech 7th semester seminar
presentation
NationalInstituteofScience&Technology
1BUDI ARVINDH (ME#201614990)
Batch 2016-20
Electrochemical Grinding
TOPIC ID :- 4718
Presented By:
Budi Arvindh Roll No. 201614990
Under the guidance of
Dr. Parameswar Dash

presentation
Batch 2016-20
Content
 Introduction
 Working principle
 Advantages
 Disadvantages
 Applications
 Conclusions
 References

presentation
Batch 2016-20
• Electrochemical grinding (ECG) is a process which is a combination of
electrochemical machining (ECM) and mechanical grinding processes. The
ECG process is applicable for shaping or grinding an electrically conductive
material. It is also termed as the “electrolytic grinding” and “anodic
machining”.
• In this technique, the work piece plays the role of the anode while the grinding
wheel works as a cathode. we use number of electrolytes are : potassium
nitrite, Sodium nitrite, Sodium Chloride, Sodium Nitrate, etc.
• The grinding wheel is the circular metal plate which consists of abrasive
particles of Silicon Carbide, Boron Carbide, Aluminum Oxide and Diamond
Dust.
Introduction

presentation
Batch 2016-20
Working Principle
• In Electrochemical grinding, the metal bonded grinding wheel filled with a
non-conductive abrasive. The grinding wheel act as a cathode and the work
piece is act as an anode.
• The electrolyte, which is usually sodium nitrate, sodium chloride, potassium
nitrite, with a concentration of 0.150 to 0.300 kg/litre of water.
• It is passed through a nozzle in the machining zone to complete the
electrical connection between the anode and the cathode.
• The work and wheel do not make contact with each other. Both are kept
apart by the insulating abrasive particles which protrude from the face of the
grinding wheel. A constant gap of 0.025 mm is maintained into which a
stream of electrolyte is directed

presentation
Batch 2016-20
Working principle

presentation
Batch 2016-20
Working principle
• The electrolyte is entrapped in small cavities of semi conductive oxide between
projecting non conductive abrasives forming electrolytic cell.
• When these cells come in contact with the work the current flows the wheel to
the work and this leads to the electrochemical decomposition of work.
• The short circuiting between the wheel and the work is prevented due to point
contact made by abrasion in order to make the surface more receptive.
• It can be seen that the process is similar to conventional grinding in that an
abrasive grinding wheel is used.
• In fact , 10 percent of the work metal is removed by abrasive cutting and 90
percent by electrolytic action.

presentation
Batch 2016-20
Advantages
It is time to throw lights on the advantages of the electrochemical grinding:
 The main advantage of this process is that it takes place in a very short span
of time.
 Higher material removal rate are possible, particularly upon hard materials
 Very little pressure is exerted on the work, practically no wheel wear is
found
 No heat is generated, so no heat cracks or distortions are developed.

presentation
Batch 2016-20
Disadvantages
There are also several drawbacks of it and these are:
 This technique of the metal removal sometime leads to the corrosion of the
surface of the work piece.
 Process limited to electrically conductive materials
 Corrosive nature of electrolyte
 Both the work piece and the grinding wheel must be conductive
 Though it is smoother and faster than traditional machining processes, it is
a little bit complicated.

presentation
Batch 2016-20
The application so the electrochemical grinding are:
• Single largest use for ECG is in the manufacturing and remanufacturing of
turbine blades and vanes for aircraft turbine engines.
 Grinding of surgical needles, other thin wall tubes, and fragile parts.
 High MRR’s when grinding hard, tough, stringy, work-hardenable or heat
sensitive materials.
Applications

presentation
Batch 2016-20
Conclusion
Hence,ECG removes electrically conductive material by grinding; with a
negatively charged abrasive grinding wheel, and a positively charged work
piece. Material removed from the work piece is carried by the electrolyte fluid
present. Electrochemical grinding and electrochemical machining are principally
similar to each other; however a grinding wheel is used instead of a tool which
is replica of the contour to be obtained on the work piece.

presentation
Batch 2016-20
1. https://www.mechanicalbooster.com/2018/09/electrochemical
-grinding.html
2. https://www.manufacturingguide.com/en/electrochemical-
grinding
3. https://www.mech4study.com/2017/03/electrochemical-
machining-principle-working-equipment-application-
advantages-and-disadvantages.html
4. https://www.theengineerspost.com/electrochemical-grinding/
References

presentation
Batch 2016-20
Thank You...

Electrochemical grinding

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