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.
Efficient and precision grinding of small hard and brittle cylindrical parts by the centerless grinding process combined with electro-discharge truing and electrolytic in-process dressing
Abstract Many of the newer innovative structural components are made of harder and tougher materials that provide improved resistance under severe conditions for advanced applications. To take advantage of these materials, a new method of centerless grinding using electrolytic in-process dressing (ELID) grinding has been developed. First, the metal bonded grinding wheel was shaped to a high precision by the electro-discharge truing technique (ED truing). In this study, small cylindrical parts from Si3N4, ZrO2, ZrO2 ferrules and steel die parts were ground using a centerless grinder equipped with ED truing and ELID. The results showed that with the use of this technology, the surface roughness and precision of the workpiece improved significantly when compared to conventional grinding, i.e., without ED truing and ELID. In addition, the grinding process was found to be stable. Thus, a highly efficient and precision centerless grinding technology has been established for small cylindrical components.
Nonobstetric lower genital tract injuries in rural India
To study the impact of nonobstetric genital tract injury (NOGTI) in rural India.