In-Process Electrical Dressing of Metal-Bonded Diamond Grinding Wheels
A new development of hybrid in-process electrical dressing of metal-bonded diamond grinding wheels is proposed in this paper. The electrical dressing method is used for overcoming the limitations of the conventional dressing methods available in relation to a super-abrasive wheel because of the hardness of its abrasive grains and the durability of its bonding material. The proposed hybrid in-process electrical dressing method consists of electro-discharge and electro-chemical processes and is implemented with twin copper electrodes and alternating power supplies. The results show that with properly maintained process conditions, a better surface finish is produced by the proposed method compared with traditional rotating SiC wheel dressing.
ECDM (Electro Chemical Discharge Machining), a New Method for Trueing and Dressing of Metal Bonded Diamond Grinding Tools
Abstract Metal bonded grinding tools cannot be processed efficiently and economically by means of traditional conditioning technologies and are therefore rarely used. A new hybrid technology that combines EDM and ECM, called ECDM, allows both the trueing and dressing of these grinding tools in just one step. Therefore ECDM is the ideal technology for trueing and dressing of metal bonded diamond tools and hence for the grinding of new cutting materials (Cermets, Ceramics, PCD). This new method has been applied successfully on a centerless grinding machine.
On-Machine Trueing/Dressing of Metal Bond Grinding Wheels by Electro-Discharge Machining
Summary This paper describes a newly proposed method for carrying out effective and precise trueing and dressing of metal bond grinding wheels on an NC grinding machine or a machining center by utilizing wire or die sinking electro-discharge machining(EDM). The main feature of this method is that a staple ED unit is mounted on the NC table of the grinding machine. Thereby trueing for eliminating the eccentricity of wheels and for generating or correcting profiled wheels is carried out by the help of NC movement of the table, keeping the grinding wheel on a machine spindle. In order to prevent the influence of wear of a block electrode in die sinking EDM, another new method is proposed for shaping or correcting the form of the electrode with a cutting tool on the grinding machine by the help of NC movement of the table. The superior effects of the proposed methods have been confirmed in the case of grinding of ceramic material with cast iron fiber bond diamond wheels.