Abstract: The design of turning curve of the grooved drum thread guide trench has direct influence on the vibration impact and noise of thread guide and the glass fiber distribution on the bobbin. At present the turning curve of thread guide trench is mainly either parabola or arc. In the actual production process, big impact on thread guide and bad running smoothness are easily produced. Moreover, fast wear and short service life will influence the package forming of glass fiber. Based on the analysis of the motion characteristics of the grooved drum when arc or parabola is as the turning curve of grooved drum of glass fiber winder, a concept of sextic turning curve is proposed, its motion equation is deduced, and its motion law is analyzed. The research shows that using grooved drum with sextic polynomial turning curve can effectively improve the motion characteristics of thread guide and avoid flexible impact at the turning segment of grooved drum. The acceleration change in the whole turning zone is gradually and continuously. The vibration impact tests of grooved drums with arc turning curve and with sextic polynomial turning curve are compared, and which verifies that using the latter can reduce the flexible impact at the turning segment of grooved drum, thus reducing vibration and noise and prolonging the service life of thread guide.

Key words: Grooved drum, Kinematic characteristics, Return curve