To reduce flaws on a surface in abrasive machining for a glass substrate for a magnetic recording medium.
This abrasive device consists of a double-face sander 1 for carrying out abrasive machining for a glass substrate for a magnetic recording medium by using an abrasive lubricant mixed with abrasive, and an abrasive lubricant circulating device 2 for re-supplying the abrasive lubricant used for the abrasive machining to the double-face sander 1. In this case, the abrasive lubricant circulating device 2 consists of a first tank 21 for inflowing the abrasive lubricant used for the abrasive machining, and a second tank 22 interposed between the first tank 21 and the double-face sander 1. In the first tank 21, sedimentation separation of a glass substance from an abrasive is carried out and the sedimeted abrasive mixed abrasive lubricant is discharged to the second tank 22. The abrasive lubricant mixed only abrasive is supplied from second tank 22 to the double-face sander 1.
KAMEYAMA SATORU
KUSANO TATSUICHI
OZAWA MASAHARU
NIKON GIJUTSU KOBO KK
NIKON CORP