Ultra-high-speed forming method using electroplasticity effect

Abstract

A method for forming or deforming a workpiece at a high speed using electroplasticity effect includes: applying a first level of pulse current to the work piece to cause the electroplasticity effect and lower a flow stress of the work piece; and applying a first level of electromagnetic force to the workpiece for 150˜300 μs to form or deform the work piece in a desired shape while the flow stress of the work piece is maintained at the lowered level, wherein the first level of electromagnetic force is lower than a second level of electromagnetic force which is required to form or deform the workpiece in the desired shape without applying the first level of pulse current.

1 . A method for forming or deforming a workpiece at a high speed using electroplasticity effect, comprising:
 applying a first level of pulse current to the work piece to cause the electroplasticity effect and lower a flow stress of the work piece; and   applying a first level of electromagnetic force to the workpiece for 150˜300 μs to form or deform the work piece in a desired shape while the flow stress of the work piece is maintained at the lowered level,   wherein the first level of electromagnetic force is lower than a second level of electromagnetic force which is required to form or deform the workpiece in the desired shape without applying the first level of pulse current.   
     
     
         2 . The method of  claim 1 ,
 wherein the first level of pulse current varies depending on the workpiece.   
     
     
         3 . The method of  claim 2 ,
 wherein the flow stress of the workpiece varies depending on the workpiece.   
     
     
         4 . The method of  claim 1 ,
 wherein the first level of electromagnetic force is Lorentz force.   
     
     
         5 . The method of  claim 1 :
 wherein the first level of electromagnetic force is applied using a high-capacity capacitor.   
     
     
         6 . The method of  claim 1 ,
 wherein the first level of electromagnetic force is generated using a forming coil.   
     
     
         7 . The method of  claim 6 ,
 wherein the forming coil discharges currents, changes a magnetic flux, and applies an induced electromotive force to the workpiece.   
     
     
         8 . The method of  claim 7 ,
 wherein the forming coil creates a strong magnetic field, and   wherein the strong magnetic field applies an induced current to the workpiece by Faraday's Law.