What are the characteristics of graphite electrode discharge parameters?
Characteristics of Graphite Electrode Discharge Parameters
(1) Peak Current (IP)
Characteristics: The higher the peak current, the lower the electrode wear and the greater the surface roughness; under certain area conditions, the faster the machining speed.
When the peak current exceeds 12 A, the electrode wear reaches its minimum;
When the peak current exceeds 32 A, machining becomes unstable.
Selection Criteria:
Select by Current Density:
Current density is the current value that an electrode can withstand per unit area.
Experimental results show: Copper electrode: 6-8 A/cm² Graphite electrode: 5-7 A/cm²
(2) Pulse Width (ON)
Definition: Pulse width is the duration of the voltage pulse applied across the discharge gap between the electrode and the workpiece.
Characteristics: The larger the pulse width, the lower the electrode wear and the greater the surface roughness; under certain current conditions, the faster the machining speed.
When the peak current is less than 12 A, the processing speed increases with increasing pulse width.
When the peak current is greater than 16 A, the processing speed decreases with increasing pulse width.
Experiments have shown that when the pulse width is greater than 150 μs, the loss of graphite electrodes can be reduced to below 1%, achieving the goal of low-loss processing, but this cannot exceed 420 μs.
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