Method and device for forming a dynamic pressure-generating groove in a fluid dynamic pressure bearing

Abstract

An apparatus for forming a fluid dynamic pressure groove in a fluid dynamic pressure bearing including a mechanism for positioning and securing multiple workpieces to be machined to their respective machining devices; a mechanism for imparting an electrochemical dissolving effect to each target surface of the multiple workpieces to be machined, each of these workpieces serving as a part of the fluid dynamic pressure bearing; and a mechanism for forming at least one fluid dynamic pressure groove on each target surface of the multiple workpieces to be machined. The groove has a specified shape, dimension and surface condition. The same electrolyte is directed from a common electrolyte tank to each machining device used on the multiple workpieces.

1 . An apparatus for forming a fluid dynamic pressure groove in a fluid dynamic pressure bearing, comprising: 
 a means for positioning and securing multiple workpieces to be machined to their respective machining devices;    a means for imparting an electrochemical dissolving effect to each target surface of said multiple workpieces to be machined, each of said workpieces serving as a part of said fluid dynamic pressure bearing; and    a means for forming at least one fluid dynamic pressure groove on said each target surface of said multiple workpieces to be machined, said groove having a specified shape, dimension and surface condition,    wherein the same electrolyte is directed from a common electrolyte tank to each machining device used on said multiple workpieces.    
   
   
       2 . The apparatus for forming a fluid dynamic pressure groove according to  claim 1 , wherein all machining devices used on said multiple workpieces are located on a common machining bed, and wherein said means for imparting said electrochemical dissolving effect further comprise means for supplying a pulsed voltage from a pulsed power supply.  
   
   
       3 . The apparatus for forming a fluid dynamic pressure groove according to  claim 2 , wherein said pulsed voltage supplied from said pulsed power supply is independently applied and controlled with respect to each of said multiple workpieces.