It defines and clarifies the experimental investigation on HSS steel material by using die sinker EDM.It is very helpful to the users who are waiting for the experimental analysis of the readings which is taken.

1. PRESENTATION BY
A.ADITYA REDDY

2. ABSTRACT :
 Electric Discharge Machining (EDM) is one of the most accurate
non -traditional machining process available for creating tiny
apertures, complex shapes etc.
 The objective of EDM is to get high MRR along with achieving
reasonably good surface quality of machined component.
 It has important machining parameters like discharge current
(Ip), Voltage(v), pulse on time (Ton), pulse off time (Toff),
magnetic field strength(Mf) and work time (Tw) are considered
for investigation.
 The effects of machining parameters such as metal removal rate
(MRR), Tool wear rate (TWR), surface roughness (SR) are
investigated with and without magnetic field for Untreated High
Speed Steel (M2).
 In this experiment,copper tool is used to machine the work
piece.

3. EDM :
 It is an electro thermal non traditional machining process, where electrical
energy is used to generate electrical spark and material removal mainly
occurs due to thermal energy of the spark.

4. WORKING PRINCIPLE :
Whenever sparking takes place between two electrical contacts, a small amount
of material is removed simply as
“controlled erosion through a series of electric sparks”

5. EXPERIMENTATION :
 Tool and workpiece are connected to the DC power supply. A
dielectric fluid(EDM 30) is circulated to the gap between tool
and work piece.
 when the current is passed across the electrodes a narrow
column of spark is generated between the tool and
workpiece.
 optimum gap is to be maintained between the tool and
workpiece.
 Kinetic energy of electrons converted into heat energy from
which material is removed.

6. WORKPIECE :
Untreated High Speed Steel (M2)
 It is Tungsten Molybdenum High Speed Steel
 Composition (C-0.85, Mn-0.28, Si-0.3, Cr- 4.15, W-6.15, Mo- 5, V-1.85)
 Density : 8138Kg/m3
 Specific Gravity : 8.14
 Modulus Of Elasticity : 30 x 106 psi (207GPA)

7. TOOl :
Copper Electrode (Circular cross-section)
 99% pure Copper
 Good thermal conductivity
 Corrosion resistance
 Good Machinability
 High strength

8. MAGNET :
 Material : Ferro Ceramic Alloy
 Type : Ring
 Dimensions : OD 90mm x ID 36mm
x 15mm Thk
 Field Strength : 0.9 Tesla

9. DI ELECTRIC FLUID :
Dielectric Fluid : EDM-30
Properties :
 Allowable Burn Rate: 150 Amp
 Specific Gravity: 0.80 @ 25° F
 Viscosity: 36 SSU @ 100°F (38°C)
 Flash Point: 200° F
 Dielectric Strength: 45KV
functions of dielectric :
 cools down the tool & work piece
 Flushes away the debris
 Localizes the spark energy into a
small cross-sectional area

10. OPTIMIZATION :
For the optimization of Machining parameters
 Analysis Of Variance (ANOVA)
 Response Surface Methodology (RSM)
Techniques are used

11. READINGS OF MACHINING :
Current
(amp)
Voltage
(v)
Ton
(ms)
Toff
(ms)
Time
(min)
MRR
(mm3
/min)
TWR
(gr/min)
SR
(µm)
15 40 7 7 10.246 20.6279 0.0875 5.56
15 50 8 8 14.436 15.8324 0.0388 4.92
15 60 8 8 13.60367 16.9818 0.0412 2.56
15 70 9 9 17.51667 10.9434 0.0832 5.24
20 70 7 8 14.22367 16.0688 0.1261 5
20 80 8 7 12.15433 22.8486 0.1383 4.039
20 40 9 10 15.638 15.7941 0.0501 6.08
20 60 10 9 9.671167 27.1905 0.0695 4.7
25 80 7 7 12.03417 18.7881 0.4005 5.52
25 70 8 9 11.08383 19.623 0.0505 5.4
25 60 9 7 9.516167 28.4081 0.0117 3.529
25 80 10 8 13.997 18.6115 0.1281 3.919

12. GRAPHS RELATED TO MRR :

13. GRAPHS RELATED TO TWR :

14. GRAPHS RELATED TO Ra :

15. MULTI RESPONSE OPTIMIZATION :

16. READINGS OF MACHINING : WITH MAGNET
Current
(amp)
Voltage
(v)
Ton
(ms)
Toff
(ms)
Time
(min)
MRR
(mm3
/min)
TWR
(gr/min)
SR
(µm)
15 40 7 7 7.35033 25.9123 0.1067 5.64
15 50 8 8 10.3648 16.7162 0.1297 5.039
15 60 8 8 12.4782 25.4068 0.0718 5.52
15 70 9 9 14.891 11.8003 0.0376 3.54
20 70 7 8 12.2988 12.2891 0.0638 2.429
20 80 8 7 10.272 17.2262 0.1309 3.219
20 40 9 10 13.5345 20.4278 0.0911 4.359
20 60 10 9 11.3367 12.5734 0.0494 2.429
25 80 7 7 12.6843 29.4502 0.1325 5.8
25 70 8 9 12.359 13.2236 0.0453 5.96
25 60 9 7 7.08167 27.2424 0.0791 4.419
25 80 10 8 14.6775 21.0137 0.0611 5.72

17. GRAPHS RELATED TO MRR :

18. GRAPHS RELATED TO TWR :

19. GRAPHS RELATED TO Ra :

20. MULTI RESPONSE OPTIMIZATION :

21. THANK YOU
FOR WATCHING