| 摘要 |
<PICT:1058930/C6-C7/1> <PICT:1058930/C6-C7/2> Material is electrolytically removed from an elongate workpiece 54, Fig. 2, while moving the workpiece past the working faces of series of spaced apart electrodes 34 and while pumping liquid electrolyte to and through the workpiece-electrode gaps at super-atmospheric pressure. The electrolyte is supplied through passageways 64 and leaves through passageways 66 provided with check valves 68 which prevent electrolyte escaping until the electrolyte pressure in the apparatus has reached a predetermined value. Electric current is supplied to the workpiece by brushes 74 which are slidable in passageways 76, Fig. 5. Each brush is retained in its passageway by a spring but can be pushed forward against the spring action by air supplied under pressure through a passageway 86 to contact the workpiece. The workpiece is fed at constant rate through the apparatus and, as shown in Fig.2, the working face of each electrode makes a slight angle towards the workpiece in the direction of movement and preferably this angle is in the range 45' to 2 1/2 DEG . The spacing of the electrodes 34 from the surface 57 of the guide on which the workpiece 54 moves diminishes from the end at which the workpiece enters the apparatus, preferably so as to maintain a workgap between each electrode and the workpiece not greater than0.015 inch. Electrolyte may be pumped through the workgaps at a pressure in the range 40 to 350 p.s.i. and direct current in the range 100 to 8000 amps at a voltage in the range 4 to 25 may be used for erosion. |
