Abstract—A lappet hook is part of ring frame of a spinning machine in a textile mill. The lappet hook imparts twist to the yarn. The lappet hook help to wind the yarn on the bobbin. High contact pressure (upto 35 N/square mm)is generated between the thread and surface of lappet hook during winding, mainly due to centrifugal force. This pressure leads to degradation of internal surface of the hook, which significantly affects its working life. The objective of this study was to enhance the working life of the hook in order to decrease the idle time required to reinstate the lappet hook on the spindle periodically during spinning. The objective was carried out by means of thermal spray coatings, where the effect of the coatings on the extent of wear and the wear characteristics of the rings were examined. Detonation gun sprayed coatings, namely WC-Co, was compared in this study on MSEN8 of the lappet hook. The objective was carried out by means of hard coatings, where the effect of the coatings on the extent of wear and the wear characteristics of the lappet hook were examined. The study compared thermal spray coatings, namely D-GUN sprayed WC-Co on MSEN8. Wear tests were performed on Pin-On-Disc apparatus using ASTM G99 Standard for the uncoated and coated samples of high tensile steel. The result of coating experimental wear data generated, of the worn samples is used to analyze the wear behavior of coated as well as uncoated high tensile steel. The results show that WC-Co coatings have been successfully deposited on MSEN8 grade of high tensile steel by Detonation Spray Process. The coated MSEN8 has shown significantly less wear loss as compared to bare MSEN8. The cumulative volume loss for detonation sprayed coatings increases with increase in load. The WC-Co coating has undergone minimum wear. The WC-Co-En14B coating-substrate combination has shown minimum wear.

Index Terms—Wear rates, Thermal spray coating, Lappet hook.

Cite: Gurdeshbir Singh, Preetkawal Singh, Daljeet Singh and Gurvishal Singh, "Investigating the Effects of Wear Rates on MSEN-8 by Thermal Spray Coating," International Journal of Mechanical Engineering and Robotics Research, Vol. 2, No. 2, pp. 135-140, April 2013.