Patent ID: 7118448
Filing Date: 2006-10-10
Classification: B24B

Abstract:
1. A truing device of a grinding wheel in a grinding machine for grinding a workpiece by rotating the grinding wheel, for truing a grindstone surface of the grinding wheel having abrasive grains bound by a conductive binding material of the grinding wheel, comprising: an electro-discharge truing electrode disposed oppositely to the grindstone surface in a spaced apart relationship, current feeding means for feeding current to the grindstone and electro-discharge truing electrode, truing electrode driving means for traversing the electro-discharge truing electrode along the grindstone surface of the grinding wheel, and control means for controlling the current feeding means and the truing electrode driving means synchronously with each other, wherein said electro-discharcge truing electrode is a disk-shaped rotary electrode being rotatably driven by electrode rotary drive means, and said control means controls a gap dimension between the grindstone surface of the grinding wheel and a cylindrical electrode surface of the rotary electrode by controlling grinding wheel infeed driving means for moving the grinding wheel in an infeed direction, according to the electrical information of a position of the rotary electrode detected either during a traversing motion or upon completion of the traversing motion of the rotary electrode.