Electroerosion spindle assembly

Abstract

An electroerosion spindle assembly includes a main shaft, a tool electrode having a rear end directly or indirectly attached to the shaft and in alignment with the main shaft in a longitudinal direction, a container surrounding the main shaft, a stationary-to-rotary electrical conduction device mounted on the container for transitting power energy to the tool electrode, and a channel routing a flushing fluid to a front end of the tool electrode. The channel has at least one flushing slot in the container.

1 . An electroerosion spindle assembly includes:
 a rotatable shaft;   a tool electrode having a rear end directly or indirectly attached to the shaft and a front end for performing electroerosion machining, the tool electrode being in alignment with the shaft in a longitudinal direction,   a sleeve surrounding the shaft;   a stationary-to-rotary electrical conduction device for transmitting power energy to the tool electrode, the stationary-to-rotary electrical conduction device being mounted on the sleeve; and   a channel routing a flushing fluid to the front end of the tool electrode, the channel having at least one flushing slot in the sleeve.   
     
     
         2 . The electroerosion spindle assembly according to  claim 1 , wherein the sleeve defines at least one cavity for receiving the stationary-to-rotary electrical conduction device therein. 
     
     
         3 . The electroerosion spindle assembly according to  claim 2 , wherein the at least one flushing slot of the channel is defined adjacent to the at least one cavity. 
     
     
         4 . The electroerosion spindle assembly according to  claim 3 , wherein the flushing slot and the cavity are substantially parallel in the longitudinal direction. 
     
     
         5 . The electroerosion spindle assembly according to  claim 2 , wherein the stationary-to-rotary electrical conduction device includes at least one electrical brush electrically connecting with an outer surface of the shaft. 
     
     
         6 . The electroerosion spindle assembly according to  claim 5 , wherein the stationary-to-rotary electrical conduction device includes at least one carbon brush electrically connecting with the outer surface of the shaft. 
     
     
         7 . The electroerosion spindle assembly according to  claim 6  further comprising at least one coil biasing the carbon brush toward the shaft. 
     
     
         8 . The electroerosion spindle assembly according to  claim 7 , wherein the at least one carbon brush includes at least opening for securing one end of the coil, and wherein a cover is secured to the sleeve and secures the other end of the at least one coil. 
     
     
         9 . The electroerosion spindle assembly according to  claim 6  further comprising a sleeve tightly surrounding the outer surface of the shaft, the electrical brush contacting with the sleeve. 
     
     
         10 . The electroerosion spindle assembly according to  claim 1  further comprising a holder at a distal rear end thereof for adapting the spindle assembly to a general CNC machine. 
     
     
         11 . The electroerosion spindle assembly according to  claim 10  further comprising an insulator for insulating the holder from the shaft. 
     
     
         12 . The electroerosion spindle assembly according to  claim 1  further comprising a stop block, the stop block including a securing rod for securing the electroerosion spindle assembly to a general CNC machine. 
     
     
         13 . The electroerosion spindle assembly according to  claim 12 , wherein the stop block is secured to the sleeve, and wherein the stop block includes one inlet for the channel. 
     
     
         14 . The electroerosion spindle assembly according to  claim 1 , wherein the channel includes an internal flushing channel and an external flushing channel. 
     
     
         15 . The electroerosion spindle assembly according to  claim 14 , wherein the internal and external flushing channels respectively include flushing slots in the sleeve. 
     
     
         16 . The electroerosion spindle assembly according to  claim 14 , wherein the flushing slots of the internal and external flushing channels are generally parallel in the longitudinal direction. 
     
     
         17 . The electroerosion spindle assembly according to  claim 1 , wherein the shaft and the tool electrode are both tubular with interior hollow portions, the hollow portions of the communicating with the slot of the channel, so as to transmitting flushing fluid to the front end of the electrode through the slot and the hollow portions of the tubular shaft and the tool electrode. 
     
     
         18 . The electroerosion spindle assembly according to  claim 1  further including a flushing tube surrounding the shaft and defining a circular flushing channel therebetween, a flushing fluid flowing through the circular flushing channel for providing external flushing of the tool electrode. 
     
     
         19 . The electroerosion spindle assembly according to  claim 18  further including a nozzle at a front portion of the flushing tube. 
     
     
         20 . The electroerosion spindle asssembly according to  claim 1  further including a bushing, the bushing including a rear end detachably secured to the shaft and front end detachably secured with the tool electrode.