Patent ID: 8789399

Claim:
A method for leveling parts in a roller leveling machine, which comprises an upper roller frame and a lower roller frame, and in which upper and lower leveling rollers are each arranged in a separate leveling roller block, the upper and lower leveling rollers defining leveling triangles having lengths 2t, at least one of the leveling roller blocks being variable in its position and angle so that a leveling gap can be adjusted, wherein at least one leveling gap setting device is arranged at an infeed side and/or at an outfeed side of the leveling machine, wherein an automatic leveling gap control is provided to set the leveling gap, the method comprising: (a) acquiring an overall length of a part to be leveled; (b) dividing the length of the part to be leveled into a number n of equal partial areas with a side length ΔX, the size of which is selected so that an integer number of partial areas with side length ΔX lies in each of the leveling triangles of length 2t; (c) acquiring a thickness s of the part to be leveled; (d) acquiring a variable width b in the center of each of the partial areas; (e) calculating the value bs 2 for each partial area; (f) determining the average values bs 2 M by simple averaging over the number of values bs 2 present in each of the leveling triangles; (g) dividing the average values bs 2 M by a characteristic value of the leveling machine and multiplying the quotients thus obtained by the value of a maximum deflection (max X) of the roller frame comprising the adjustable leveling roller block and by a ratio of a yield point of a material to be leveled (σ F ) to a maximum design value of the leveling machine, from which an optimum value for an offset or correction is obtained, wherein the characteristic value is a function of a maximum value of bs 2 of the roller leveling machine and σ F ; and (h) adding, during the leveling of the part to be leveled, the offset value determined for each of the leveling triangles to a basic setting value of a leveling gap on the infeed side of the leveling machine so as to readjust the setting device of the leveling gap as a function of the leveling triangles mapped onto the part to be leveled as it moves through the leveling gap.