US3611777A

US3611777A - Drive for rolling mill

Info

Publication number: US3611777A
Application number: US882461A
Authority: US
Inventors: Erich Bretschneider
Original assignee: Siemag Siegener Maschinenbau GmbH
Current assignee: Siemag Siegener Maschinenbau GmbH
Priority date: 1968-12-13
Filing date: 1969-12-05
Publication date: 1971-10-12
Anticipated expiration: 1988-10-12
Also published as: DE1814460A1

Abstract

THIS INVENTION HAS TO DO WITH A ROLLING MILL CONSISTING OF THREE COOPERATING ROLLS, ONE OF WHICH IS POSITIVELY DRIVEN AND THE OTHER TWO ARE DRIVEN BY A TURBINE-LIKE MOTOR.

Description

12, 1971 E. BRETSCHNEIDER DRIVE FOR ROLLING MILL Filed Dec. F

1 m H 8 n Ina-Mme ie/CM flfem'c/m/s/oeli m BM flTrbk/YE) 3,611,777 DRIVE FOR ROLLING MILL Erich Bretschneider, Buderich, Germany, assignor to Siemag Siegener Maschinenbau Gmb'H, Dahlbruch,

Germany Filed Dec. 5, 1969, Ser. No. 882,461 Claims priority, application Germany, Dec. 13, 1968, P 18 14 460.0 Int. Cl. B21b 35/00 US. Cl. 72-249 4 Claims ABSTRACT OF THE DISCLOSURE This invention has to do with a rolling mill consisting of three cooperating rolls, one of which is positively driven and the other two are driven by a turbine-like motor.

BACKGROUND OF THE INVENTION It is well known to reduce stock diameter by use of a rolling mill of the type described in German Pat. No. 1,059,865 in which three rolls are arranged around the stock path, and these rolls are displaced 120 relative to each other. However, only one roll is equipped with a drive which produces the total rolling force. The two other rolls are connected to the drive roll by bevel gears. Because of the use of bevel gears, this arrangement is very expensive, and the smallest usable roller diameter is limited to about 12 inches. In addition, with this arrangement, a roller adjustment is not possible.

Based on this experience, it was noted that for this type of rolling mill, one roll drive is sufficient; the two other rolls can be driven by the driving roll causing the movement of the rolling stock. During entrance, the front end of the stock meets the one driven roll and the two non-driven rolls, and the latter have to be accelerated to the operational speed by the rolling stock, so that considerable shocks could occur. To prevent such shocks and their effects to the rolling stock and the rolling stand, it has been suggested that the two rolls be brought to speed by means of a small drive before the entrance of the rolling stock. Such small drives mostly consist of separatelyarranged electric motors with gear drives permitting adjustment for the rolls. The expenditure and space requirements of such drives, however, are so large that they have not become popular. These and other difficulties experienced with the prior art devices have been obviated in a novel manner by the present invention.

It is, therefore, an outstanding object of the invention to provide a rolling mill of the three roll type, wherein two of the rolls are driven at stock rolling speed by an inexpensive drive which is simple in construction, yet rugged and dependable.

Another object of this invention is the provision of a rolling mill using three rolls in a 120 cluster, wherein two rolls are driven by means that will permit their adjustment relative to the other roll without difiiculty.

With these and other objects in view, as will be apparent to those skilled in the art, the invention resides in the combination of parts set forth in the specification and covered by the claims appended hereto.

SUMMARY OF THE INVENTION In general, the invention lies in a rolling mill having three rolls mounted for rotation about axes lying at equal angles to each other, the rolls having grooves on their peripheries lying adjacent the path of stock movement and forming a substantially closed roll pass. A high power drive is connected to one of the rolls to provide all the power necessary to bring about stock feed and deformation, while an auxiliary drive is connected to the other two United States Patent 3,611,777 Patented Oct. 12, 1971 ice rolls, which drive consists of a wheel having a saw-tooth edge with a fluid stream striking it tangentially.

BRIEF DESCRIPTION OF THE DRAWINGS The character of the invention, however, may be best understood by reference to one of its structural forms, as illustrated by the accompanying drawings, in which:

FIG. 1 is a horizontal elevational view of a rolling mill embodying the principles of the present invention, and

FIG. 2 is a sectional view taken on the line IIII of FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT This invention consists of a rolling mill which forms a roll pass with at least three rolls where only one roll is equipped with a drive to supply the total rolling forces for the operation. The other rolls are equipped with an auxiliary drive of small power output. Such a roller pass drive makes it possible, with little expenditure, to obtain a roll adjustment, takes very little space, and permits the use of small roll diameters. Each auxiliary drive is designed with a wheel having on its circumference impact areas to which is applied a liquid stream. It has proven to be of advantage to use wheels which have saw-shaped teeth. It is also of advantage to direct the liquid stream through a nozzle which is arranged tangentially to the toothed wheel and directed against the steep flanks of the teeth. The cooling and the lubricating action of the sprayed liquid stream can be made useful; it is also possible to arrange the wheel within a housing which incorporates the nozzle.

Referring to FIG. 1, it can be seen that the rolling mill stand for a wire rod mill train comprises three

rolls

1, 2, and 3 arranged at angles of 120. The rolls are equipped with profiles or grooves of well-known design and are carried by

shafts

4, 5, and 6 supported within the stand. The shaft 4 is connected to a high power driving device by a coupling (not shown), and the driving device is designed to produce the total force for the rolling operation.

On the

shafts

5 and 6 are arranged

auxiliary drive devices

7 and 8, respectively. The

auxiliary drive devices

7 and 8 are called up only to perform the task of bringing the

shafts

5 and 6 with the rolls 2 and 3- from the stationary condition up to the desired rate of revolution. Each auxiliary drive device consists, as shown in FIG. 2, of a housing 9, which is mounted in the roll stand fixed relative to the support bearings for

shafts

5 and 6. The housing 9 is provided with a tooth wheel 11 having sawshaped teeth on its circumference. This wheel is positioned on an end 10 of the shaft 6. To this toothed wheel 11 is applied a liquid stream such as Water, which originates from a nozzle 12. The nozzle 12 is arranged tangentially to the wheel 11 within the housing '9 and is connected to a conduit 13 supplying the liquid. In this way, the liquid stream always hits the steep-sloped flanks of the teeth and moves the wheel. This movement is transferred to the shaft 6 and consequently to the roll 3. The toothed wheel may be designed with a thread to tighten the rolls to the shaft and to achieve nut-and-bolt action In case use is made of the cooling or lubricating action of the liquid, the housing may be eliminated completely, or can 3 It is obvious that minor changes may be made in the form and construction of the invention without departing from the material spirit thereof. It is not, however, desired to confine the invention to the exact form herein shown and described, but it is desired to include all such as properly come within the scope claimed.

The invention having been thus described, what is claimed as new and desired to secure by Letters Patent is:

1. A rolling mill for attenuating elongated stock, comprising (a) three rolls mounted for rotation about axes lying at equal angles to each other, the rolls having grooves on their peripheries lying adjacent the path of the stock and forming a substantially closed roll pass, (b) a high power drive connected to one of the rolls only to provide the entire power necessary to bring about movement of the stock through the roll pass and its deformation, and (c) an auxiliary drive for the other two rolls consisting 4- of a wheel formed with impact areas around its circumference and a fluid stream impinging on the impact areas to rotate the wheel.

2. A rolling mill as recited in claim 1, wherein the wheel is formed with a saw-tooth circumferential formation.

3. A rolling mill as recited in claim 2, wherein the fluid stream consists of a jet extending tangentially to the wheel against steep slopes of the teeth.

4. A rolling mill as recited in claim 1, wherein the wheel rotates in a housing and the fluid stream originates in a nozzle mounted on the housing.

References Cited UNITED STATES PATENTS MILTON S. MIEHR, Primary Examiner