ANDREW ERNEST MELZER
Engineers in Bethel Park, PA

5255548, Oct 26, 1993

Dec 3, 1992

7/984965

Andrew E. Melzer - Bethel Park PA

Mesta International - Pittsburgh PA

B21D 102

72 13

A method of levelling metal plate in a leveller having at least three vertically opposed sets of driven and backed-up upper and lower work rolls mounted in at least three upper roll frames and a lower roll frame, each of the upper roll frames being adjustably movable with respect to the lower roll frame in a vertical direction and tiltable in a direction of a pass line of plate passed through the leveller to vary a gap between the upper and lower work rolls, said method comprising (a) measuring the temperature of the plate prior to its entry into the leveller and the time at which such temperature measurement is made; (b) measuring the actual thickness of the plate and the corresponding roll separating force; (c) inputting into a computer the plate physical data, the roll diameter, rolling speed, and the data of steps (a) and (b), and calculating the variance of such measured plate temperature from the furnace soak temperature and the variance of such actual plate thickness from an expected plate thickness; (d) using the computer, with the aid of the aforesaid data input, to calculate roll gap settings necessary to provide bending of the plate such that, in each work roll set, at least fifty percent of the plate thickness section is stressed to the yield point of the metal; (e) transmitting the calculated roll gap settings to means to vertically and tiltably adjust the upper work roll frames to provide corresponding adjusted work roll gaps, and (f) levelling the plate by passing the plate successively through the adjusted work roll gaps.

5189896, Mar 2, 1993

Mar 2, 1992

7/844120

Andrew E. Melzer - Bethel Park PA
Leonard P. Blough - Irwin PA

Mesta International - Pittsburgh PA

B21D 102

72 13

A roller leveller for one-pass levelling of high strength metal plate comprises a main frame, top beams mounted on the main frame, three upper roll frames mounted on the top beams, a lower roll frame mounted on the main frame, three sets of upper and lower driven work rolls mounted, respectively, on the upper and lower roll frames, backup rolls backing up each work roll, four screwdown assemblies associated with each set of upper work rolls whereby they are movable as a set vertically and tiltable in the direction of a pass line of plate passed through the leveller; and control means separately to control the gap between the upper and lower work rolls in each set.