US1800891A - Tube-rolling mill - Google Patents

Description

April 14, 1931.

F. KocKs 1,800,891

TUBE ROLLING MILL Filed Jan. 3. 1929 3 Sheets-Sheet 1 April 14, 1931. F. KocKs TUBE ROLLING MILL Filed Jan. 5, 1929 3 Sheets-Sheet 2 momai April 14, 1931. F. KOCKS TUBE ROLLING MILL Filed Jan. 3, 1929 5 Sheets-Sheet 5 Patented Apr. 14, 1931 PATENT OFFICE FRITZ KOOKS, F DUSSELDORF, GERMANY TUBE-ROLLING MEL Application filed January 3, 1929, Serial No. 329,998, and in Germany March 31, 1928.

My invention relates to tube-rolling mills of the type in which the rolling process is subdivided into a punching and kneading stage. It is an ob'ect of my invention to a provide a mill of this type in which the rolls are supported at both ends.

To this end I arrange the axes of one pair of rolls in a plane intersecting the plane in which the axes of the other pair are arranged. I may for instance provide one pair of rolls the axes of which extend in a vertical plane, and another pair in which the axes extend in a horizontal plane, but it is not important that the planes should intersect at right angles nor is it important that the axes of the rolls in one or the other pair should extend in the same plane, but their axes may be staggered, extending in parallel at either side of a central plane which intersects the plane of the axes of the other pair or the central plane to which such axes are parallel.

For the purpose of this specification the term punching rolls as used in the specification and in the claims appended to it is intended to designate the rolls, which provide for the piercing of the billet and act mainly on the solid part of the billet, into which the mandrel is designed to enter. The term kneading rolls is applied to the rolls which cooperate with the mandrel for forging the walls of the hollow tubular blank produced by the action of the punching rolls.

By this arrangement of the rolls I am enabled to provide bearings for the support of the rolls of either end thereof although I do not wish to be limited to bearings at either end of each roll. I may for instance provide bearings at either end of the punching rolls, but only at one end of the transverse or kneading rolls or I may provide bearings at the ends of all rolls. A rolling mill of the latter type will now be described,

the Mannesmann-type may be subdivided it being however understood that I do not into two distinct stages, to wit the stage in which the blank is principally punched, and the stage in which the blank after having been punched, is kneaded internally, or welded, extended and reduced as to its wall thickness by transverse action.

These two stages of the process require sectioning of the rolls on distinct principles and such principles are not readily realized in a single pair of rolls, so that it has been 60 suggested to provide two pairs of rolls, one pair principally performing the punching, the other the kneading. However the problem of reliably supporting the rolls in mills of this type involves certain difliculties which are overcome, according to this invention, by arranging the axes of the rolls in each pair at an angle to each other, so that the bearings at the ends of the several pairs of rolls will not interfere with each other. I am at liberty to choose whether to provide bearings at both ends of all the rolls or of the rolls in one of the pairs only, for instance the punching rolls.

Apart from the possibility of providing bearings at either end of the rolls the novel arrangement of the rolls also renders possible a gradual overlapping of the two stages of the process with respect to the two pairs of rolls and a suitable guiding of the blank throughout the rolling process.

In the drawings aflixed to this specification and forming part thereof a rolling mill embodying my invention is illustrated diagrammatically by way of example.

In the drawings Figs. 1 and 2 are end elevations of the mill viewed from the entry and from the exit side, respectively,

Fig. 3 is a plan view of the mill,

Fig. 4.- is a vertical section of the mill on the line IV-IV in Fig. 1,

Figs. 5, 6 and 7 are sections on the lines V-V, VI-VI and VII-VII, respectively, in Fig. 3. p v 95 Referring first to Figs. 1 to 4, a and b are the housings of the pairs of rolls, a and d being the punching rolls and e and f the transverse kneading rolls. The rolls in the two pairs are supported in bearings in vertical and horizontal slots of the housings a and b, g and 7:. being the chocks for the punching rolls 0, d at the entry, and i and is being their chocks at the exit side, while Z, m and n, 0 are the chocks of the kneading rolls e, f at the entrance and exit sides, respectively. The usual adjusting screws q are provided for the several chocks.

Rotation is imparted to the rolls by means of shafts a" and s for the punchin rolls, and t and u for the kneading rolls, 'v laeing suitable clutches connecting the journals of the several rolls with their respective shafts. w is the blank and m the mandrel.

As appears from Fig. 1, the axes of the punching rolls 9 and h are staggered horizontally a distance y. The axes of the kneading rolls 6, f are staggered vertically a distance a. The axes of the punching rolls a, d which extend in parallel planes with respect to each other and with the axes of the blank and the mandrel, are arranged in intersecting vertical planes, and so are the axes of the kneading rolls 6, f which also extend in planes parallel to each other and to the axes of the blank and the mandrel.

The operation of this rolling mill is as follows:

As mentioned above, the first pair of rolls 0, 03 substantially or exclusively performs the operation of punching while the second pair of rolls 6, f substantially or exclusively per forms the operation of kneading, which means welding, extending and reducing the wall thickness. By arranging the axes of the rolls as above described, it is not only possible to provide bearings at all the ends of all the rolls, but the two stages of the proc ess now overlap in this sense that the kneading rolls e, 7 will start acting on the blank before the punching rolls 0, d have completed their work on the blank. As will appear from Fig. 5, the gap A between the rolls a, d is equal to the gap B between the rolls 7, 6. This gradual overlapping is of great advantage with respect to the stress acting on the blank and also with respect to the finish of the tube. Another advantage is that while the rolls 0, d perform the punching operation, as illustrated in Fig. 6, the kneading sections of the rollse, 7 act as guides for the blank, the gap Cbetween these rolls being wider than the gap D between the rolls 0. d. Conversely, as shown in Fig. 7 the punching rolls 0, d may act as. guides for the blank during the kneading operation performed by the rolls 6, f, the gap E of the punching rolls being wider than the gap F between the kneading rolls.

I wish it to be understood that I do not viesirc to be limited to the exact details of construction shown and described for obvious modifications will occur to a person skilled in the art.

, In the claims afi'ixed to this specification no selection of any particular modification of the invention is intended to the exclusion of other modifications thereof and the right to subsequently make claim to any modification not covered by these claims is expressly reserved.

I claim 1. Tube-rolling mill comprising a pair of punching and a air of transverse kneading rolls, the axes of one pair of rolls being arranged in a plane intersecting the plane in which the axes of the other pair are arranged, and bearings at either end of a roll in one of said pairs.

2. Tube-rolling mill comprising a pair of punching and a pair of transverse kneading rolls, the axes of one pair of rolls being arranged in a plane intersecting the plane in which the axes of the other pair are arranged, anfil bearings at either end of said punching r0 s.

3. Tube-rolling mill comprising a pair of punching and a pair of transverse kneading rolls, the axes of one pair of rolls being arranged in a plane intersecting the plane in which the axes of the other pair are arranged, anld bearings at either end of said kneading ro s.

4. Tube-rolling mill comprising a pair of punching and a air of transverse'kneading rolls, the axes of one pair of rolls being arranged in a plane intersecting the plane in which the axes of the other pair are arranged, and bearings at either end of each roll.

5. Tube-rolling mill comprising a pair of punching and a pair of transverse kneading rolls, the axes of one pair of rolls being arranged in a plane intersecting the plane in which the axes of the other pair are arranged, and bearings at either end of a roll in one of said pairs, the rolls in each pair being sectioned so as to enable said kneading rolls to start operating on the blank before said punching rolls have completed their operation thereon.

6. Tube-rolling mill comprising a pair of punching and a pair of transverse kneading rolls, the axes of one pair of rolls being arranged in a plane intersecting the plane in which the axes of the other pair are arranged, and bearings at either end of a roll in one of said pairs, said kneading rolls being sectioned so that their kneading sections serve for guiding the blank with respect to said punching rolls.

7. Tube-rolling mill comprising a pair of punching and a pair of transverse kneading rolls, the axes of one pair of rolls being arranged in a plane intersecting the plane in which the axes of the other pair are arranged, and bearings at either end of a roll in one of said pairs, said punching rolls being sectioned so that their trailing sections serve for guiding the blank with respect to said kneading rolls.

8. Tube-rolling mill comprising a pair of punching and a air of transverse kneading rolls, the axes 0 one pair of rolls being arranged in parallel to a pair of intersectin planes and alternately on opposite sides 0 5 said planes, a mandrel arranged intermediate said pairs of rolls and bearings at either end of a roll in one of said pairs.

9. A tube rolling mill comprising a pair of punching rolls and a pair of transverse n kneading rolls forming together the rolling system, the axes of both pairs of rolls being arranged symmetrically with respect to two planes intersecting in the axis of said system. 10. A tube rolling mill comprising a pair 115 of punching rolls and a pair of transverse kneading rolls formin together the rolling system, the axes of bot pairs oi rolls being arranged symmetrically with respect to two planes intersecting at right angles in the axis 20 of said system.

In testimony whereof I aflix my signature.

FRITZ KOGKS.

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