研削砥石概説一研削砥石の分類と構造一

摘要

砥石は古くから道具の研ぎや磨き作業に使われ， 現代における私たちの身近なところでは包丁研ぎ に，産業界では除去加工の一つである研削加工の 主たる工具として使用されている.%A grinding wheel is made of extremely hard abrasive grains that form cutting edges on the wheel in comparison with metallic material, nonmetallic material, etc. The grinding wheel consists of three constituents, namely the abrasive grain, bond and pores. Abrasive grains act as cutting edges for cutting the work material. Bond platform support the cutting edges as a holder. Pores store cutting chips and assist flush out. During use, an abrasive grain that decreases at the cutting edge always provides a new edge, but when it has been exhausted and released, the next abrasive grain is newly provided (this phenomenon is called self-sharpening). A grinding wheel rotates at high speed. Each cutting edge consists of many blades. Thus, one cutting blade cuts the workpiece for a short time and takes a rest for along time. This is favorable as viewed from standpoint of grinding wheel service life. Since there are the above features for grinding work, a high efriciency, high precision and good finishing surface can be obtained.