US3533262A - Multiroll tandem mill construction - Google Patents

Description

1970 M. G. SENDZIMIR MULTIROLL TANDEM MILL CONSTRUCTION 3 Sheets-Sheet 1 Filed Aug. 8, 1968 I INIVENTOR. Aim/4a G e-ozwua I addaz, 4 ma ATTORNEYS Oct. 13., 1970 M. G. SENDZIMIR 3,533,262

MULTIROLL TANDEM MILL CONSTRUCTION Filed Aug. 8, 1968 3 Sheets-Sheet 2 lNNENTOR MICHAEL G SENDZ/M/E BY L adda, J 5 7410 l nan ATTORNEYS Oct. 13, 1970 M. e. SENDZIMIR ,2

MULTIROLL TANDEM MILL CONSTRUCTION Filed Aug. 8, 1968 :5 Sheets-Sheet 5 NV E N TO R Mex/4a G San/02mm ATTO RNEYS United States Patent 01 fice Patented Oct. 13, 1970 US. Cl. 72-205 7 Claims ABSTRACT OF THE DISCLOSURE The adaptation of multiroll mills, such as the Sendzimir cluster mills, to tandem operation with high intrastand tension. In a tandem train of such mills, the entrance stand and the exit stand are modified in one of several Ways to provide for more even force distribution and more even wear of the components. Stands between the entrance and exit stands, if any, are not modified.

BACKGROUND OF THE INVENTION The invention relates to the field of rolling mills especially for the cold reduction of metallic strands under high tension in a tandem train of multiroll or cluster type mills such as are exemplified by the well known Sendzimir mill and disclosed and claimed in the Sendzimir U.S. Pats. Nos. 2,170,732, 2,194,212, 2,237,794 and others.

The Sendzimir mill makes use of small diameter work rolls backed by clusters of larger rolls, some of which may be seated in massive beams. Screwdown or roll adjustment is accomplished by eccentric mounting of the outermost backing rolls. Rolls of this type have heretofore been employed as single stand mills of either one way or reverse type of operation. The advantages of tandem arrangement of conventional two-high or four-high mills with tension between stands are well known; but when it is atempted to use the Sendzimir type mills in a tandem train with high intra-stand tension, it is found that the load and wear on the entrance and exit stands is uneven.

SUMMARY OF THE INVENTION The use of multiroll stands in a tandem train with high intra-stand tension, while providing for better force distribution and more even wear of the mill components, is made practical by making the entrance and exit stands unsymmetrical with respect to the vertical and in a mutually opposite sense so as to oppose the high intra-stand tension. The unsymmetry of the entrance and exit stands may be achieved in several Ways: the backing roll clusters on the entrance and exit stands may be inclined toward each other (away from the pay-off reel and coiler respectively); the backing structures on the entrance and exit stands may be made more robust on the mutually opposed sides thereof (the sides remote from the payoff reel and coiler respectively), or if the mill stands are of a construction such as described and claimed in Sendzimir US. Pat. No. 3,318,130 wherein the working rolls are located in rotating jugs and can therefore be displaced from the centerline of the stand, the desired result may be achieved by displacing the work rolls of the entrance and exit stands toward the pay-off reel and coiler respectively. It will be understood that any stands which may be provided by the entrance and exit stands conventional.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a somewhat diagrammatic elevational view of a tandem train of four mills illustrating one embodiment of the invention.

FIG. 2 is a view similar to FIG. 1 illustrating a second embodiment of the invention; and

FIG. 3 is a view similar to FIGS. 1 and 2 and illustrating a third embodiment of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS While the drawings show in each case a tandem train of four mills comprising an entrance mill, two intermediate mills and an exit mill, it is to be understood that the invention is applicable to a two-mill train comprising an entrance mill and an exit mill only as well as to a tandem train comprising one or more intermediate mills. It should also be understood that the intermediate mills, if any, may be of standard construction and thus be symmetrical about the vertical.

Referring more particularly now to FIG. 1, there is shown a tandem train comprising an entrance mill 10, two intermediate mills 11, and an exit mill 12. The strip 13 enters the mill 10 from a pay-off reel 14 and passes from the exit mill 12 to a coiler 15. It will be observed in the drawing that mills 11 are symmetrical about the vertical.

The entrance mill 10 is modified in that the upper and lower clusters indicated generally by the numerals 16 and 17 are inclined as indicated by the lines 18 and 19 in a direction away from the pay off reel. Similarly, the backing roll clusters 20 and 21 of the exit mill are inclined as indicated by the lines 22 and 23 away from the coiler 15. The amount of inclination mentioned above is determined by what is required to offset the tensions of the pay-off reel and the coiler. It. will be within the skill of the competent engineer to determine the optimum inclination. As a matter of general practice, the angle of the lines 18, 19, 22 and 23 (FIG. 1) will be on the order of 4 to 12.

In FIG. 2 there is shown a modification of the invention wherein the same result is accomplished in a different Way. The several mills are here indicated by the reference numerals 10a, 11a and 12a. Again the intermediate mills 11a are symmetrical about the vertical and the entrance and exit mills are modified. The modification in this instance instead of an inclination of the clusters involves a beefing up of backing rolls 241 of the upper and lower clusters 16a and 17a. Similarly, in the exit stand the backing rolls 25 of the upper and lower clusters 20 and 21 are made oversize. It will be observed that the backing rolls 24 and 25 are those on the side of the mills respectively remote from the pay-off reel and the coiler. The backing rolls 24 and 25 are made sufliciently larger than the other backing rolls to offset the working rolls such an amount that the angle between the axis of a working roll and the central backing roll is on the order of about 4.

FIG. 3 shows a further embodiment which is applicable particularly to mills according to the Sendzimir US. Pat. No. 3,318,130. These mills have the working rolls located in rotating chucks so that the working rolls may be displaced from the centerline of the stand. Mills of this type are also comprehended in the general turn cluster mill as used herein although they differ specifically from those of FIGS. 1 and 2.

In this embodiment, the two intermediate stands are unmodified and are symmetrical about the vertical.

The entrance stand 100 has its chucks 26 and 27 rotated clockwise and counterclockwise, respectively, to displace the working rolls 28 and 29 toward the pay-off reel 14. Similarly, the mill 120 has the upper and lower chucks 30 and 31 rotated counterclockwise and clockwise, respectively, to displace the work rolls 32 and 33 toward the coiler 15. The amount of displacement of the work rolls 28, 29 and 32, 33 should be such that the angle between the axis of a working roll and the backing structure 26 is on the order of 4 to 12.

All three embodiments of the invention result in a forced distribution when the mills are operating with high intra-tension such that better rolling and more even wear of the components is achieved.

It will be understood that various modifications may be made without departing from the spirit of the invention and no limitation not specifically set forth in the claims is intended or should be implied.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A tandem train of multiroll mill stands for the cold rolling of a. steel strand under high intra-stand tension, including, in the order named, a pay-off reel, and entrance and an exit stand at least, and a coiler, each of said entrance and exit stands being unsymmetrical with respect to the vertical and in a mutually opposite sense, whereby to oppose said intra-stand tension.

2. A tandem train according to claim 1, wherein the unsymmetry consists in that the backing roll structures of said entrance and exit stands are tilted away from said pay-01f reel and coiler, respectively.

3. A tandem train according to claim 2, wherein the amount of tilt is between 4 and 12.

4. A tandem train according to claim 1, wherein the unsymmetry consists in that the backing structures on said entrance and exit stands are more robust on the sides of said stands remote from said pay-01f reel and coiler, respectively.

5. A tandem train according to claim 4, wherein the said unsymmetry results in an angular offset of the work rolls of about 4.

6. A tandem train according to claim 1, wherein the unsymmetry consists in that the work rolls on said entrance and exit stands are displaced from the stand centerlines toward said pay-off reel and coiler, respectively.

7. A tandem train according to claim 6, wherein the displacement of the work rolls results in an angular ofiset of the work rolls of between 4 and 12.

References Cited UNITED STATES PATENTS 2,095,733 10/1937 Coryell 72-205 X 2,237,794 4/ 1941 Sendzimir 72-205 2,303,143 11/1942 Spangler 72-205 MILTON S. MEHR, Primary Examiner US. Cl. X.R. 72-234

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