DE307856C - How to roll out I and U irons in universal rolling mills by turning the flanges - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 307856 CLASS 7a. GROUP

the flanges.

Addendum to patent 254977.

Patented in the German Empire on November 24, 1915. Longest duration: June 30, 1926.

According to patent 254977, I and (J irons with parallel-faced flanges are made in universal rolling mills in such a way that the flanges are alternately bent and straightened to to enable machining of the flange edges in the direction of the rolling pressure.

The straightening of the bent flanges is done when the rolling rod passes through a four-roll mill by means of pressing of the approached vertical rollers, while the flange edges when retreating • through the same stand from the edges of the Horizontal rolls are processed.

As is known, this working through of the flange edges causes a gradual collapse the naturally higher flanges at the beginning of the rolling up to the flange height of the finished profile, which is then equal to the height of the vertical rollers in the last stitch is.

Since the lower horizontal roller is now fixed, the lower edge of the vertical rollers cuts when approaching for the purpose of straightening with the upper edge of the lower horizontal roller, d. H. thus also with the lower flange edge of the rolling rod from, while the upper edge of the vertical rollers during the large majority of the Attacks stitches below the upper edge of the flange; this difference in altitude is natural Largest at the first stitches and then increases as the flanges do are compressed in the vertical direction, from.

If one now for the purpose of * complete straightening according to the content of the patent 254977 approaches the bent flanges with a corresponding sharpness deep cuts and corresponding bulges in the flanges, which are further on The course of the rolling process could no longer be eliminated at all; the goodness and the ver. The sales ability of the end product is of course severely impaired.

Now during the practical work through of the method according to patent 254977 found that the flange edges are also adequately processed with the first stitches without straightening the flanges, d. H. so if you are in still bent state presses. This experience has been used to remedy the disadvantage described above.

Accordingly, the I and U irons are produced in accordance with the present additional invention in such a way that the flange edges are initially in a somewhat> bent state processed and that only with the last stitch the flanges are completely straightened will.

Since the vertical rollers with this modification

tion of the process do not need to approach the flanges sharply, the Damage to the carrier avoided without the other implementation of the method is affected.

The procedure is illustrated in the drawing. . The double T-beam happened first of all the main frame according to FIG. i, where the flanges are bent open; the carrier

ίο then gets into the side frame while hanging according to Fig. 2; here the 'vertical rollers are moved so far that the flanges are almost straight. There is now a slight inclination of about 3 to 4 °.

In this state, the girder goes back through the side frame according to Fig. 3; here the vertical rollers are retracted and now the horizontal rollers are lowered, the edges of which are the narrow flange edges in the slightly bent Process conditions. The beam then goes into the main frame where the flanges come back be bent more strongly.

This procedure takes place during the first stitches, while it takes place during the last Stitches according to the method of the main patent is worked, so where the flange halves be straightened completely straight by moving the vertical rollers strongly.

Since the vertical rollers therefore do not need to be pressed tightly against the flange in the first main stitches, the formation of bulges on the flange edges is avoided; During the last stitches, however, is because then the flanges have already experienced a significant extension, so that therefore the vertical rolls no more violence with so much overall moved up need be, one. Bead formation does not take place at all or only so little that it can be easily eliminated by simple straightening by means of the vertical rollers of the secondary stand at the last stitch.

Claims (1)

Patent entitlement: Process for rolling out I and U irons with parallel flanges in Universal rolling mills with alternating bending and straightening of the flanges according to patent 254977, characterized in that the flange edges are initially in still bent state of the flanges processed and the flanges only at the the last stitches must be straightened completely. 1 sheet of drawings.