抄録
With the progress of the wearing of a fine-spinning ring by the running of a traveller, a regular waviness is often observed on the worn surface of the ring. It reduces the stability of the running traveller and shortens the life of the ring. This article deals with the characteristics and the mechanism of the growth of waviness on a ring and considers preventive methods.
The wavy-worn surface of a ring is a nearly sinsonical profile. That is to say, it has a wave height less than 0.1mm and a relatively uniform wave length, 3.5_??_5.5mm. It has been established by experiment and theoretical caleulation that the regularity of the wave length on a wavy-worn surface is due to the lateral elastic vibration of ring-guided running traveller.
The spun yarn which drives the traveller makes a vibration identical to the lateral vibration of a stretched thread. This vibration is equal in frequency to the lateral vibration of the traveller The lateral vibration of the traveller, then, is apt to grow in severity.
On the other hand, measuring of the hardness distribution in the interior of a ring shows that the wavy wear is conspicuous on a ring having a great hardness gradient in the hardened surface layer. So long as the present mechanism of rings and travellers is employed, the best method to prevent wavy wear is to reduce the hardness gradient in the hardened surface layer or to increase the thickness of the layer.
