ディスクグラインダに生じる振動の発生要因とその低減対策

抄録

Disk grinder is a type of electric tool that rotates a disk-shaped grinding wheel with a motor to grind and cut the surface of a workpiece such as metal or wood. At this time, the worker is at risk of developing hand-arm vibration problems by receiving vibration on the hand-arm part. In this study, we aim to reduce the vibration from the viewpoint of engineering in order to reduce the risk of developing hand-arm vibration problems in the disk grinder. First, an experiment was conducted to investigate the cause of vibration of the disk grinder. As a result, it was found that the cause of vibration of the disk grinder is forced vibration by unbalance, vibration by motor characteristics, and self-exited vibration by friction generated between the disk and the work material at the time of contact. In particular, it was found that self-excited vibration due to friction had a large effect on hand-arm vibration. In this study, dynamic absorber was used to control the self-excited vibration due to the friction generated in the disk grinder. The vibration control effect was confirmed when a properly tuned dynamic absorber was attached to the disk grinder. Therefore, it was found that a dynamic absorber is effective for the reduction of vibration of the disk grinder.