Study on human behavior and skill in manual drilling operation

摘要

In many manufactures, one of the desirable manufacturing systems is the one in which human operator and machinery are reasonably complementary to each other. In order to realize the system, it is indispensable to investigate the operator's behavior from the viewpoints of operating efficiency, accuracy, physical safety, fatigue, etc. In this research, the behavior and skill in small-hole drilling has been quantitatively evaluated and their relationship has been discussed. The behavior has been evaluated by operational and physiological measurements such as operator's body motion, cutting force, blood pulse period, respiration period, electromyogram of forehead, critical flicker fusion frequency, etc. The skill has been evaluated from task time, task error and tool breakage. The experimental results showed that there are strong correlations between the behavior measurements and skill level. It was also confirmed that the skilled operators make their body movement small, and keep their respiration rate low and constant. In addition, it was found from multiple regression analysis that the operator's fatigue can be nearly estimated from the body movement, fluctuation of cutting force, hand wheel rotation speed, respiration period, etc.