SHORT DESCRIPTION OF THE INVENTION AND PRIOR ART

The invention relates to a rolling mill machine for longitudinal profile bending of thin plate, e.g. for manu¬ facturing of building plate with a trapezoidal cross section, comprised of in part a number of shaping stations with free- rolling work rolls, and partly, separate from the shaping stations, drive stations set up for feeding the strip, where the work rolls in each shaping stations are placed in rows across the strip with a row on one side of the strip and another row on the other side of the strip, the work rolls on the one side of the strip being placed laterally between the work rolls on the other side so that the strip is shaped by means of free-forming.

Such a machine is described in DE OS 2 941 180. The work rolls there are adjustable both horizontally and vertic¬ ally to allow production of different profiles. In order not to have to change the rolls, the shaping is done in two stages. First a preshaping is done to a round, corrugated profile and to the finished width for the strip. Then a final shaping is done to de desired trapezoidal profile without the width of the strip being changed. The final shaping step is replaced when changing over to another profile. The adjustment between pre-rolling and finish roll¬ ing will require capable personnel so that the change is not too time-consuming.

In WO 87/04375, a free-forming rolling machine is showr. where the work rolls are mounted in pairs of the beams which are oriented at right angles to the direction of movemenr cf the strip. Different profile forms can be obtained by shifting the pairs of work rolls along the beams and by internal adjustmer.- of the rolls of the pair. Presumably, test runs are then required as well as fine-tuning before the production run. In DE OS 2816993 a shaping machine is describred which has in the conventional manner whole profiled and driver, rolls which both form and drive the strip.

The rolls of the machine are supported by rotatable beams which can be indexed so that the desired rolls come into operative position. All the rolls on one rotatable beam are at the same distance from the rotating shaft, and after indexing one must fine-tune the position of one of the two rotatable beams which support a pair of rolls.

Also US-A 4136545 shows changing of the rolls by rotat¬ ing them, but the intention is not thereby to change the profile. According to the invention an inexpensive and simple machine is obtained which provides a fast and adjustment- free change between different profiles. The invention is characterized by the fact that in each of the shaping sta¬ tions the row of work rolls on one side of the strip is supported by a first rotatable beam, which must support also at least one other row of work rolls, and the work rolls of both of these two rows extend different distances from the rotating shaft of the first beam, and the row of work rolls on the other side of the strip is supported by another rotat- able beam, which also supports at least one other row of work rolls and the work rolls in these two rows extend an equal distance from the rotatable shaft of the other beam and in operative position form a jointly operating surface with the corresponding rolls in the other shaping stations, where the rotatable beams are lockable in alternative posi¬ tions, so that one of the rows of rolls is in operative position while the other one or more rows are swung away cut of operative position.

Through appropriate choice of profiles one can obtain more profiles than the number of rows of work rolls on the rotatable beams. Theoretically one can get profiles equal i:. number to the product of the number of rows on both rotatable beams in one shaping station.

A machine with four rows of rolls on each rotatable beam in one shaping station can thus give more than four different profiles, which in the normal case is satisfactory.

Preferably, the machine is designed so that the drive stations are placed between the shaping stations and include one drive roll over the whole v/idth of the strip and a number of rows of counter rolls, which are mounted on a rotatable beam.

Changing the drive stations can thereby be as quick as changing the shaping stations and a complete change of the machine can be done many times during one shift. SHORT DESCRIPTION OF THE DRAWINGS Fig. 1 is a side elevation through a roll shaping machin according to the invention, where the section is taken along line 1-1 in Fig. 2.

Fig. 2 is a plan elevation of the machine shown in Fig. 1. Fig. 3 is a fragmentary section taken along the line 3-3 in Fig. 1 and 2. DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENT

The rolling machine shown in the figures has a housing, the chief parts of which are made up of an upper 12 and lower 13 longitudinal beam on the one side of the machine and a corresponding upper 14 and lower 15 beam on the other side. A number of posts 18 support and hold together the upper and lower beams 12 and 13, 14 and 15, respectively, or. the respective sides, and the upper beams 12, 14 are held together with a number of cross-tie beams as are the lower ones 13, 15. The cross-tie beams have been shown in Fig. 1 and 2 and indicated by 16 and 17.

Within the housing a number of shaping stations have been constructed, whereof the first three 20-22 and the last two 23, 24 are shown. The midsection of the machine with, for example, eight shaping stations have been cut away in Figs. 1 and 2. A calibration station 25 with cylindrical full-width rolls 110, 111 makes up the final shaping sta¬ tion. Between the shaping stations and as first and last station there are drive stations 26-31.

The drive stations 26-31 are all in principle alike and in Figs. 1 and 2 reference notations have been indicated onlv on the first drive station 26. The drive stations 26-31

all have a lower cylindrical drive roll 32, which is supplied v/ith a rubber coating to increase the friction. The drive rolls 32 are driven in tandem by a motor, not shown, via a drive chain 33 which rotates a number of sprocket wheels 34, which share a shaft v/ith smaller sprocket wheels 35, which via short chains 36 rotate the drive wheels 32. The chains 33, 36, which are shown in Fig. 1 with broken lines, are placed next to the beams 14, 15, but, in order not to make Fig. 2 unclear, the drive chains and the sprocket wheels have been left out of Fig. 2. The drive stations all have an upper rotatable box beam 37 in which there is a row with free-rolling counter rolls 38 which run against the drive rolls 32. The box beam 37 in each drive stations is rotatable so that another row of free-rolling counter rolls 39 can be rotated down into operative position against the drive rolls 32 by a means which shall be described for the shaping sta¬ tions.

Between the first six stations there are support tables 41-46 which are secured between the upper longitudinal beams 12, 14.

The shaping stations 20-24 are in principle all similar to each other except that the placement of the freely rotat¬ ing rolls varies as shall be described below. Parts cf the shaping station 20 are shown in more detail in Fig. 3. It is comprised of an upper and a lower horizontal, transverse, rotatable box beam 50 and 51 respectively v/ith square cress- section.

The box beams 50, 51, also called rotating beams, have shoulders 53, 54 with journals 55, 56 which are secured by means of ball bearings 57, 58, in vertical keeper plates 59, 60, in the beams 14, 15 and 12, 13, respectively, of the housing.

Through the journals 55, 56 run rods 65 which are locked against turning by bolts 66, which slide into holes in the vertical beam 59. By means of nuts supplied with handles-67 and spacer sleeves 68, the box beams 50, 51 are axially positioned by bosses 70 which tighten against the vertical beam 60. Locking pi s 72 catch in a slot 73 in a block z- z and prevent thereby the box beams 50, 51 from turning. Tht locking pins 72 are spring-leaded in catch position.

On the rotatable beam 51 seven brackets are mounted v/ith screws, where one bracket 76 is seen whole and two brackets 77, 78 are cut. The remaining brackets are cut away. The brackets have two wings 79, 80 as is indicated on bracket 76 and a shaft 81 reaches through holes in the rings 79, 80. A roll 82 is mounted on the shaft 81 with double bearings 83, 84 at a distance from each other so that it is very stiffly mounted but free-rolling.

On the rotating beam 50 there is a row with six brackets 84 with rolls 85 attached, of which only one bracket and one roll are seen in Fig. 3.

The rolls 85 are placed laterally between the rolls 82 and the strip 91, v/hich is to be formed by the so-called free-forming, i.e. it is formed without its being squeezed between two opposite rolls as with conventional shaping.

At the very outside of both sides of the rotatable beam 50 there are two edge rolls 86, 87 similarly mounted v/ith double bearings on fixed shafts 88 secured in brackets 89.

A cylindrical part 92 of each edge roll 86, 87 is direct- ly in front of the corresponding exterior of rolls 82 in the row of rolls of the rotatable beam 51 and the strip is guidec up therebetween, the outer edges of the strip being formed by the outer cut-off conical sections 93 of the edge roll.

The lower rotatable beam 51 has a second row of brackets 101 and rolls 100 as is best seen in Fig. 3. These are intend¬ ed for the production of another profile and the upper rota¬ table beam 50 has a corresponding second row of rolls 102 as shown in Fig. 1 and Fig. 2. The edge rolls in this row 102 have in Fig. 2 been given the reference numbers 104 and 105. As is evident from Fig. 1 all the rolls of the upper rotatable beam of the shaping stations 20-24 (i.e. rolls 85 and rotatable beam 50 in Fig. 3) v/hich are in operative position touch a horizontal plane 106, designated by broken lines, and this plane 106 touches also all of the drive rolls 32 and their counter rolls 38 of the drive stations 26-31.

The plane 106 defines an entry plane for the flat strip and a delivery plane for the finished, profiled strip, i.e. a plane in which the lower profile flanges lie during the whole profile bending. The entry table and the delivery table in this plan can be made separate from the machine in general and are not shown on the figures. The support stands 41-46 also lie in this plane 106.

Drive rolls 32, and the counter rolls 38 of the drive stations 26-31 clamp the lower flanges of the strip and the clamping force is adjustable with springs. The adjustment of the clamping pressure is trivial and is not shov/n.

In Fig. 2 it is seen that counter rolls are not needed in every lower flange but there can be, by way of example, four counter rolls but six work rolls which create six lov/er flanges.

The strip 91 is flat before feeding in and is delivered as a finished, profiled strip (trapezoidally profiled) . The width of the strip decreases successively in the shaping stations just as its profile height successively increases in the shaping stations.

Change of the machine to another profile shall now be described. Changing of all rotatable beams, i.e. the rota¬ table beams of the shaping stations 20-24 and the rotatable beams of the drive stations 26-31 for the counter rolls proceeds in the same way as shall be described with refer¬ ence to Fig. 3 and beam 51.

First the nut 67 is loosened, then the locking bolt 72 is ^' ithdrawn and the beam rotated around the turning shaft I so that the row of rolls 82 is swung out of the operative position into a rest position and the row of rolls 100 is swung out of its rest position into operative position. Thereafter, the locking bolt 72 is slipped into a key slot 108 in a block 109 to fix the turning position of the rotat¬ ing beam 51 and the nut 67 is tightened down to fix the rotating beam 51 axially. Often the other beam 50 must be loosened before the beam 51 can be turned to its final posi¬ tion, since one or more of the rolls 85-87 on the upper beair. 50 can be in the way.

Thereafter the beam 50 is turned and fixed in the same manner with the rolls 102 in Fig. 1 in operative position and rolls 85-87 in Fig. 3 in inoperative position. All the rolls 102 of the upper rotatable beam of the shaping stations 20-24 in operative position should thereby touch the plane 106, just as the rolls in the operative position (rolls 85-87 on the rotatable beam 50 in Fig. 3) were doing with the set-up as shown in Fig. 1. In other words the rolls in the different rows shall extend equally far out from the turning shaft of the beam for each rotatable beam above the strip 91.

On the other hand, in each shaping station the different rows of rolls of the lov/er rotating beam normally extend different lengths out from the turning shaft of the rotating beam, since the profile height is determined by how far these rolls extend above the strip 106 in Fig. 1 and the profile height belongs to those parameters which vary between the different profiles.

The upper roll 110 in the calibration station 25 is adjusted v/ith a screv/ 112 in order to provide a final correc¬ tion to the nominal profile height.

In Fig. 3, the brackets 101 and 76 are alike except for the fact that the holes for the journals are at different heights, which provides different profile heights when the rolls 82 and 100 have the same diameter as shown. In order to compensate for the smaller width of the roll 82, there is a wider spacer sleeve between the inner rings of the mount and the bracket 76 than there is with the roll 100. In this way, the number of components can be reduced. Since one is utilizing free-forming no adjustments are necessary for the different strip thicknesses. Betv/een the edge rolls 86, 87 and the rolls 82 (Fig. 3) several tenths of a millimeter play is acceptable.

In the figures, two rows of work rolls have been shown on each rotatable beam. Since the rotatable beams have a square cross section, three or four rows can be mounted when desired. If a rotatable beam with hexagonal cross section is used, one can have six rows of rolls on each rotatable beam.

The illustrated rolling mill machine permits the strip to be cut into desired lengths before shaping instead of after shaping, which is customary. It is a great advantage always to cut the flat strip, since no change of the cutting device is then needed.