A Study of the Diamond Tool for GrindingPolycrystalline Diamond

• Main Authors: Jihng-Kuo Ho, 何靖國
• Other Authors: Shenq-Yih Luo
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/02275179814044927261

碩士 === 華梵大學 === 機電工程研究所 === 94 === Abstract The purpose of this paper was to investigate two types of cobalt and vitrified bond diamond tools produced by the hot press for the vertical flat grinding polycrystalline diamond. The worn diamond type and the diamond protrusion observed by the toolmaker or SEM after grinding under two different feed rates of 1 and 5 mm/min. and the depth of cut of 2 µm with total depth of 10µm were studied. In addition, the grinding efficiency and the workpiece surface roughness produced were analyzed as well. The experimental results showed that the diamond protrusion after dressing for the vitrified bond diamond tool was about one fourth of the diamond size and the diamond particle with a cutting ability was about 50%. For the cobalt bond diamond tool, the diamond grit with a cutting ability was about 43% and the flat diamond and pulled-out hole showed a higher percentage. When the feed rate of 1 mm/min during the flat grinding PCD was used, a lower percentage of the good diamond, a higher percentage of flat diamond and pulled-out hole on the worn surface of the cobalt bond diamond tool were obtained. For the vitrified bond diamond tool, the good diamond produced showed a higher percentage and flat grit and pulled-out hole displayed a relatively lower percentage. This may be due to the result of the relatively moderate strength and grit retention of the vitrified bond. Furthermore, the diamond protrusion and the grinding efficiency produced for the vitrified bond diamond tool were better than those for the cobalt bond tool. And the PCD surface roughness obtained was better as well. Keywords: PCD, diamond tool, cobalt bond, vitrified bond, wear, protrusion