DE254977C - Process for rolling out I and U iron with parallel-faced flanges in universal rolling mills under bending de flanges - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS Ta. GROUP

. JOHANN DOLL in BRESLAU.

Patented in the German Empire on July 1, 1911.

A rolling process for J_- and U-irons with parallel-faced flanges is known where the beams are finish-rolled with flanges bent from the web in the pass rolling mill, and the flanges - then through a special rolling mill using horizontal and vertical rollers are straightened. Another way of making it is that the double T-beams with bent flanges rolled out in a universal frame and the flange edges simultaneously in the bent state by the horizontal and Vertical rollers are processed. Here, too, there is a finite straightening of the in itself finish-rolled carrier instead. These older methods have the common feature that the machining of the flange edges in the bent-up, d. H. oblique state of the Flanges is going on that the completion of the beam in this state up to the Usage dimensions takes place, and that finally only a straightening of the bent Flange takes place by means of a single pass through a special rolling mill.

The actual manufacturing process accordingly only affects the carrier with bent open Flanging and straightening the flanges is only a minor part of the manufacturing process, since the carrier has already been stretched to its usable dimensions beforehand.

The processing of the flange edges, especially in those processes where im Main frame only a reduction of the web and flange thickness is effected, and at which the processing of the flange edges in a second frame in the bent-up state the flanges happens, has the consequence that the acting forces do not work towards upsetting the flange material, but mainly to bend the flanges outwards or in themselves to bend. This will especially occur when ■ dies with large flange widths should be produced. It is also not possible in this way to remove the flange edges to be designed vertically, i.e. to run exactly parallel to the bridge, because the the edge of the roller pressing the flange ends must have such a strong inclination that a slide is seen the flange to the outside is avoided.

However, it would not be ruled out that the deflection that occurs as a result of the oblique pressure the flanges by using lateral, appropriately shaped vertical rollers to prevent. Quite apart from the fact that these should only be as high as the final stitch corresponds to the appearance of strong lateral ridges on the outside the flanges are favored at the first stitches, the need would increase result, either these vertical rollers close with each stitch in the vertical direction adjust or raise the lower horizontal roller accordingly with each stitch. This Way would thus cause a great complication, while in the invention the

smooth vertical rolls of the second stand persist in their vertical position and only in can be adjusted in the horizontal direction, which can be achieved by simple mechanical aids is.

In addition, the inclined roll edges for processing the Flange edges only work with indirect pressure, and that as well as from

ίο the bent shape of the flanges themselves an extremely inadequate working through of the flange material in the outer parts results. But it is precisely these outer parts that are subjected to the greatest stresses, so that the greatest value in rolling girders to a careful and thorough Working through the bottle material is to be laid. Results from metallographic cuts that the material of the web of girders produced in universal universal rolling mills as a result the direct pressure applied here is very dense, but that the material in the outer parts of the flanges has a much looser structure. The fact that with the present Rolling process in which the flanges are alternately bent apart and straightened, the flanges stand vertically to the web axis when the machining of the flange edges starts that a more direct rolling pressure is exerted on the flanges, whereby a more thorough processing of the flange material is achieved than with the older methods.

The production of the carrier takes place in the following way:

The same first passes through the universal stand shown in FIG. 1, the flanges being bent in a known manner by horizontal rollers a, b and vertical rollers c, d.

The double-Y-shaped carrier then passes into the universal rolling mill shown in FIGS. 2 and 3, which is arranged immediately behind the first rolling mill. In the case of the hanging, the flanges are straightened according to FIG. 2 by pressing the vertical rollers h and g . In the next pass, the carrier passes through the same rolling mill in reverse. 3, the vertical rollers h and g have now moved back and the flange edges at i, i, i, i are machined by the horizontal rollers e and f Rolled edges of the two horizontal rolls α and b are first bent up again. The working process is then repeated until the carrier is stretched to the usable dimensions.

In the production of U-iron according to the present process is in the following manner proceeded:

The U-iron first passes through the universal rolling mill shown in FIG. 4, with the web and flange thickness being reduced in the bent state. The U-iron then passes through the second universal rolling mill shown in FIG. 5, in which the flanges are pressed in by two vertical rollers and are machined in the straightened state. The edges i and k of the upper horizontal roller are laterally displaceable on the roller body h and are adjusted after each stitch so that they exactly encompass the U-iron profile. The U-iron then goes through the same rolling mill in reverse and from there it arrives again in the former stand, whereby the flanges are bent again. This process is repeated until the U-iron is stretched to the desired dimensions. The machining of the flange edges also takes place here in the direction of the rolling pressure.

Claims (1)

Patent claim: Process for rolling out I and U irons with parallel flanges in Universal rolling mills with bending of the flanges, characterized in that the flanges are alternately bent and be straightened to effect the machining of the flange edges in the direction of the rolling pressure. 1 sheet of drawings.