ELECTROCONTACT DISCHARGE DRESSING OF METAL-BONDED DIAMOND WHEEL .2. MECHANISM OF TRUING AND DRESSING

Electrocontact discharge dressing (ECDD) belongs to the category of ED M performed under special conditions. Therefore, the discharge paramet ers of the ECDD method must be investigated in order to comprehend the mechanism of truing/dressing. This study examines the truing efficien cy and the generative process of the wheel surface topography by in-pr ocess measuring of the discharge parameters in ECDD. The results are s ummarized as follows. 1) It is necessary to apply DC voltage of more t han 20V to an electrode in order to obtain effective truing. 2) The hi gher the applied voltage is, the higher the truing efficiency as well as grain protrusion will be. 3) The dressing process can be monitored with the duty factor. 4) The degree of grain protrusions can be contro lled by changing the size of the undeformed chip produced from an elec trode. 5) The contact area between the electrode and the wheel should be of an optimum value so that the insulation recovery of the electrod e can be sufficiently secured.