Patent ID: 7225657

Claim:
A method of eliminating vibrational chatter in a rolling mill stand, the rolling mill stand comprising a housing having an entry side wall and an exit side wall each attached to a top and a base, all of which form an open housing window, an upper work roll rotatably supported within the housing window at each end of the upper work roll by a pair of upper work roll chocks, a lower work roll rotatably supported within the housing window at each end of the lower work roll by a pair of lower work roll chocks, an upper backup roll rotatably supported within the housing window at each end of the upper backup roll by a pair of upper backup roll chocks, a lower backup roll rotatably supported within the housing window at each end of the lower backup roll by a pair of lower backup roll chocks, chock liners fitted against each vertical chock surface that faces either the entry side wall or the exit side wall of the housing, a pressure means situated atop the housing to apply a desired load to the the upper and lower work rolls and upper and lower backup rolls, a plurality of thrusting means each seated below vertical surfaces of at least one pair of backup roll chocks to provide outward horizontal thrust against the adjacent housing side wall, and an activating means to activate all of the thrusting means, the method comprising the steps of: machining borings and channels in said pair of backup roll mill chocks sufficient to seat the thrusting means and any needed fixtures and tubing below the vertical surfaces of the chocks facing a housing side wall, each of said channels forming a longitudinal opening in a vertical surface of each chock in said pair along the length of said channel, said channel extending inwardly from said opening below the vertical surface of each said chock, machining the liner of each correspondingly machined chock with openings sufficiently aligned with the borings of the respective chock to allow the thrusting means to freely thrust horizontally outward against the housing side wall, attaching each machined liner to its respective chock in an alignment that allows the thrusting means to freely thrust horizontally outward against the housing side wall, and interconnecting the thrusting means of each machined chock to an activating means so that when activated each thrusting means thrusts outward against one side of the housing to take up any gapping that may exist between the machined chocks and the housing side wall.