A Study of the Bronze Bonded Diamond Tool for Grinding BK7 Glass
| Autor: | Jenn-Yeu Wang, 王振宇 |
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| Rok vydání: | 2006 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 94 The purpose of this paper is to investigate the bronze-bonded diamond tools made of four different amounts of resin and graphite by using the hot press. These tools operated in the dry grinding BK7 glasses were used to evaluate the performance of grinding forces, the diamond wear, the material removal mechanisms and the surface roughness under four different conditions of the high spindle rotation speed and feed. The experimental results showed that the diamond tools containing the more amounts of graphite and the less amounts of resin displayed a close-packed and strong structure. On the contrary, the diamond tools with the more amounts of resin and the less amounts of graphite showed a loose and weak structure. When a diamond tools with the more amounts of graphite was employed, the average grinding forces produced during the dry grinding BK7 glasses were relatively larger. This is possibly the effect of a strong structure of bond containing a fewer amounts of resin. In addition, the grinding forces with the increase of the grinding step increased. This is because the diamond tools become progressively worn. Furthermore, the grinding forces with the increase of the spindle rotation speed and feed decreased. It was attributed to the thinner chip produced. The BK7 glasses ground by the diamond tools mainly displayed a brittle fracture mode. The material removal behaviors on the circumference of the trace during the dry grinding BK7 glasses displayed a brittle fracture appearance with some deeper cracks, which are due to a cutting action of the more protrusive diamond grits under a larger grinding force. Conversely, the center on the trace of the BK7 glass ground showed primarily a plastic flow of glass chip covered and adhered on the brittle cracks. It was the result of a rubbing behavior by the more number of flat diamonds under smaller grinding force. Beside, when the bronze-bonded diamond tool contained the more amounts of resin and the less amounts of graphite was used under a higher spindle rotation speed and feed, the surface roughness of workpiece obtained was better. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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