Brand: R8340(EK82)
Density (g/cm3) : 1.72
Hardness (Shaw) : 10/100:80
Bending strength (MPa) : 45
Compressive strength (MPa) : 90
Elastic modulus (GPa) : 10.5
Coefficient of thermal expansion: 2.9
Resistivity (μΩcm):12
Thermal conductivity W/(m•k) : 90
EDM Graphite R8340(EK82) is an economical and efficient grade suitable for roughing
8340 is mainly used in: large die groove, forging die, large die casting die, large extrusion die, rough cut electrode 8500 is mainly used in: large die groove, forging die, large die casting die, large extrusion die, rough cut electrode 8510 is mainly used in: forging die, die casting die, large blow die, high quality rough cut electrode, large electrode in non-critical tolerances.
8340 is an isotropic fine grain graphite, suitable for general processing, it has the characteristics of high metal cutting rate and strong wear resistance, affordable, and each has a large size.




Characteristics of graphite:

1. Light weight: the specific gravity is 1/5 of copper, suitable for making large electrodes

2. Good machining performance: cutting resistance is 1/3 of copper

3. The surface is easy to handle: no burrs after machining, easy to handle manually

4. High temperature resistance: When the temperature reaches 3650℃, sublimation gasification can withstand greater current

5. Low coefficient of thermal expansion: 1/4 of copper, and no deformation when heated

6. Fast discharge processing speed: the discharge processing speed is 3 to 5 times that of copper block, and it is more obvious when large-area or rough processing.

7. The electrode loss is small: the ratio with copper is 2:4, which can be non-destructive processing.

Graphite electrode machining method:

1. Cutting tool requirements: sharp, with large front and rear angles and chip slot

2. Tool material: carbide knife coating knife diamond knife

3. Feed speed: roughing 5500~8000 finishing 4000~6000

4. Machine speed: roughing 6500~10000 RPM; Finishing 6000~20000 RPM

5. Processing allowance: roughing 0.6mm; Finish 0.3mm

6. Cutting quantity: the lateral cutting quantity is 1/2~2/3 of the tool diameter, and the depth cutting quantity is 1~1.5 times of the tool diameter

7. Cutting direction: The milling direction is better than the upper cut, and the downward milling is better than the inverse milling

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