CONVENTIONAL AND NON TRADITIONAL MACHINING PROCESS
When we talk about manufacturing process it can be broadly classified as:-
Primary manufacturing process
- Secondary manufacturing process
Secondary manufacturing process includes removal of material from products obtained from primary manufacturing process (machining). This can also be divided into two parts:-
- Conventional machining process
- Non traditional machining process.
- Drilling
- Boring
- Grinding
- Cutting
- Broaching
- Lathe operation
- Milling,etc
- Abrasive jet machining (AJM)
- Water jet machining (WJM)
- Ultrasonic jet machining (USM), etc.
BASIC DIFFERENCE BETWEEN CONVENTIONAL AND NON TRADITIONAL MACHINING
- Conventional machining process
There is direct contact between the tool and work piece. fig:-conventional machining
- The cutting action takes place on application of cutting force applied by tool.
- Under any condition tool is harder than the work piece.
- Material removal takes place by chip formation by shear deformation (may be microscopic chip formation).
- Less tool life, due to repeated wear of tool.
- Any material can be machined.
- Large amount of noise is produced due to metal and tool contact on cutting.
- Accuracy is not very high.
- More care and precaution is aught to be taken for such machining process.
- Overall cost is less/capital cost is less.
- No need of highly skilled operators.
2. Non traditional machining
- There is no direct contact between the tool and the work piece.
- Cutting action takes place by different forms of energy. For example in elecrto chemical machining, chemical reaction is basic process of machining where chemical dissolution of work piece occurs.
- Tool may or may not be harder than work piece.
- Material removal may occur by chip formation or by chemical deposition or other form.
- No noise is produced, since no contact and no friction is involved between tool and work piece.
- High accuracy is obtained and good surface finish.
- Tool life is long, since no wear and tear takes place.
- Skilled labor is to be employed.
- Costlier process than conventional machining processes.
- This type of machining is helpful in conditions where high temperature rise in work piece during operation is a major problem. In NTM, flow of electrolyte removes heat from working region.
- On the other hand high production rate due to costlier equipment and skilled operators add to its disadvantage.
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