Method for automatically zeroizing a universal edger stand

Abstract

A method for automatically zeroizing a universal edger stand for rolling an H-section product comprises: spacing apart the vertical rolls horizontally so as not to impede a vertical movement of the horizontal rolls; vertically adjusting the lower horizontal roll in a predefined zero position; achieving a first roll kissing by bringing the upper horizontal roll in contact with the lower horizontal roll and pressing it with rolling pressure against the latter; registering the positions of the lower horizontal roll and the upper horizontal roll during the first roll kissing as zero values for the horizontal rolls; spacing apart the lower horizontal roll and the upper horizontal roll symmetrically about the pass line of the stand so as to define a gap of a predetermined magnitude Y between the two horizontal rolls, wherein the predetermined magnitude Y is chosen so that the vertical rolls can contact the conical flanks of the horizontal rolls; achieving a second roll kissing by pressing the vertical rolls with rolling pressure against the conical flanks of the horizontal rolls; registering the positions of the vertical rolls during the second roll kissing as auxiliary zero values X0' for the vertical rolls; and computing real zero values X0 for the vertical rolls in function of the auxiliary vertical zero values X0', the predetermined magnitude Y and the angle between a generatrix of the cylindrical rolling surface and a generatrix of the conical rolling flanks of a horizontal roll.

Description

technical field [0001] The invention mainly relates to a method for automatically zeroing the frame of a universal edger for rolling H-shaped cross-section products. Background technique [0002] The universal edger stand (UE stand) is a rolling stand that can realize the functions of the traditional universal rougher stand (UR stand) and the edger stand (E stand) at the same time, in which The function of the traditional universal roughing mill stand is to rough-roll the flange and web of H-section products, and the function of the edger stand is to rough-roll the flange ends of such products. rolling. Typically, such UE stands are used tandem with conventional UR stands to ensure good dimensional accuracy while increasing the productivity of the rolling operation. [0003] Like a conventional UR stand, a UE stand includes a set of four rolls, namely an upper horizontal roll, a lower horizontal roll, a left vertical roll and a right vertical roll. Each horizontal roll ha...

AI Technical Summary

Problems solved by technology

[0013] Although this prior art method provides a simple, fast, fully automatic and accurate method of zeroing a universal rolling mill stand, unfortunately, due to the impossibility of making the machine The four rolls of the stand are in contact (touching) at the same time, so it cannot be used on a universal edger stand as described above

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