01-03-2013, 02:57 PM
Electrical Discharge Machine - EDM
Electrical Discharge.pptx (Size: 535.07 KB / Downloads: 46)
INTRODUCTION
Die-sinking EDM systems, the electrode (cutting tool) and workpiece are held by the machine tool. The power supply controls the electrical discharges and movement of the electrode in relation to the workpiece. During operation the workpiece is submerged in a bath of dielectric fluid (electrically nonconducting). (Die-Sinking EDM is also called Sinker, Ram-Type, Conventional, Plunge or Vertical EDM)
EDM – Die-Sinking (Plunge)
The electrode (plunger) can be a complex shape, and can be moved in X, Y, and Z axes, as well as rotated, enabling more complex shapes with accuracy better than one mil.
The spark discharges are pulsed on and off at a high frequency cycle and can repeat 250,000 times per second. Each discharge melts or vaporizes a small area of the workpiece surface.
The amount of material removed from the workpiece with each pulse is directly proportional to the energy it contains.
Plunge EDM is best used in tool and die manufacturing, or creating extremely accurate molds for injection-molding plastic parts.
Wire EDM
Wire EDM machines utilize a very thin wire (.0008 to .012 in.) as an electrode. The wire is stretched between diamond guides and carbide that conduct current to the wire and cuts the part like a band saw. Material is removed by the erosion caused by a spark that moves horizontally with the wire.
Electrical Discharge.pptx (Size: 535.07 KB / Downloads: 46)
INTRODUCTION
Die-sinking EDM systems, the electrode (cutting tool) and workpiece are held by the machine tool. The power supply controls the electrical discharges and movement of the electrode in relation to the workpiece. During operation the workpiece is submerged in a bath of dielectric fluid (electrically nonconducting). (Die-Sinking EDM is also called Sinker, Ram-Type, Conventional, Plunge or Vertical EDM)
EDM – Die-Sinking (Plunge)
The electrode (plunger) can be a complex shape, and can be moved in X, Y, and Z axes, as well as rotated, enabling more complex shapes with accuracy better than one mil.
The spark discharges are pulsed on and off at a high frequency cycle and can repeat 250,000 times per second. Each discharge melts or vaporizes a small area of the workpiece surface.
The amount of material removed from the workpiece with each pulse is directly proportional to the energy it contains.
Plunge EDM is best used in tool and die manufacturing, or creating extremely accurate molds for injection-molding plastic parts.
Wire EDM
Wire EDM machines utilize a very thin wire (.0008 to .012 in.) as an electrode. The wire is stretched between diamond guides and carbide that conduct current to the wire and cuts the part like a band saw. Material is removed by the erosion caused by a spark that moves horizontally with the wire.