9. Need
• Machining - produces finished products with high degree of
accuracy
• Conventional machining
• Utilizes cutting tools (harder than workpiece material).
• Needs a contact between the tool and workpiece.
• Needs a relative motion between the tool and workpiece.
10. Need
• The need for higher productivity, accuracy and surface quality
• Improve the capability of automation system and decreasing their
sophistication (decreasing the investment cost) requirements
• Very hard fragile materials difficult to clamp for traditional
machining
• When the work piece is too flexible or slender
• When the shape of the part is too complex
• Internal and external profiles, or small diameter holes.
16. Mechanical Based Processes
1. Working principles
2. Equipment used
AJM
WJM
AWJM
USM
3. Process parameters
4. MRR
5. Variation in techniques used
6. Applications
16
17. Electrical Based Processes
Electrical
EDM
WEDM
1. Working principle
2. Equipment used
3. Process parameters
4. Surface finish & MRR
5. Electrode/Tool
6. Power & Control circuits
7. Tool wear
8. Dielectric
9. Flushing
10. Applications
17
18. Chemical & Electrochemical Based
Processes
1. Working principles
2. Etchants & Maskants
3. Techniques of applying maskants
CHM 4. Process parameters
ECM 5. Surface finish & MRR
ECG 6. Electrical circuits in case of ECM
ECH 7. Applications
18
19. Thermal Based Processes
1. Working principles
2. Equipment used
3. Types
LBM
4. Beam control techniques
PAM
5. Applications
EBM
19
21. Selection Process
• Selection Process is based of following
parameters
- Physical Parameter
- Shapes to be Machined
- Process Capability
- Economic consideration
22. Physical Parameter
Parameter ECM EDM
Potential, V 5- 30 50-500
Current, A 40,000 15-500
Power, kW 100 2.70
Gap, mm 0.5 0.05
Medium Electrolyte Die electric
fluid
Work Tungsten
EBM LBM
200 x 103 4.5 x 103
0.001 2
0.15 20
100 150
Vacuum Air
PAM USM AJM
250 220 220
600 12 1.0
220 2.4 0.22
7.5 0.25 0.75
Abrasive
Argon Nitrogen grains
Tungsten
M/C diff All Mtl All Mtl All Mtl HSS
Material carbide carbide