Patent ID: 8708780

Claim:
A honing apparatus including a rotary tool that grinds an inner cylindrical surface to be formed in a workpiece, and a tool guide disposed at one end of the workpiece and having a guide hole that guides the rotary tool to the inner cylindrical surface, the honing apparatus comprising: a guide member provided on an outer periphery of the rotary tool and having a slide surface that slides in the guide hole; an electrically conductive grindstone provided on the outer periphery of the rotary tool and having a grinding surface that grinds the inner cylindrical surface; an electrode member provided in the guide hole of the tool guide and facing the grinding surface of the electrically conductive grindstone when the rotary tool passes through the guide hole; and an electrolytic dressing unit for applying voltage to the electrically conductive grindstone and the electrode member when the rotary tool passes through the guide hole, wherein the guide member includes a base member provided on the outer periphery of the rotary tool, and a slide member provided on the base member and serving as the slide surface, and wherein the base member is composed of a material having higher insulating properties than the slide member, and the slide member is composed of a material having higher abrasion resistance properties than the base member.