Patent ID: 6379473
Filing Date: 2002-04-30
Classification: B21B,B23P,C21D,C23C,F16G,Y10T

Abstract:
A method of manufacturing a laminated ring for use as a belt in transmitting power in a continuously variable transmission, comprising the steps of:welding opposite ends of a sheet of maraging steel to form a cylindrical drum; severing said drum into a plurality of rings; rolling said rings to a predetermined length; nitriding the rings in a salt-bath nitriding process by dipping the rings in a molten salt containing 38-46% of CNOâˆ’ and 1-2% of CNâˆ’ and heated to a temperature in the range from 480 to 530Â° C., for a period of time ranging from 10 to 25 minutes; and stacking the rings into a laminated ring.