US1610593A - Manufacture of seamless pipes - Google Patents

Description

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3 Sheets-Sheet 1 M. ROECKNER Filed August 5 1925 MANUFACTURE OF SEAMLESS PIPES M. ROECKNER MANUFACTURE OF SEAMLESS PIPES Dec. 14 1926.

1925 3' Sheets-Sheet ,2

Filed August 5,

.lflllil lt ligesses: 4

I Dec. 14-, 1926.

1,610,593 M. ROECKNER MANUFACTURE OF SEAMLESS PIPES Filed August 5, 1925 5 Sheets-Shoat 3 Mfr eases Patented Dec. 14, 1926.

UNITED STATES v f 1,610,593 PATENT OFFICE.

MARTIN ROECKNI ER, OF EULHEIM-BUHR, GERMANY.

MANUFACTURE or SEAMLESS rrrns.

Application filed August 5,1925, Serial No. 48,368, and in Germany June 24, 1922.

It is already known to make seamless pipes of a hollow blockby rolling it both inside and outside starting at a point, rolling it out and smoothing toward the end of pipe. It --l has further beenproposed, for instance, to use a rolling mill with inner and outer pairs of rolls of which the axes are located parallel to the pipe axis, the rolls being arranged on a circular arc,'of equal width and of crowned or curved formation. Owing to this arrangement, the stretchinggof the material takes place mainly in the direction of the pipe circumference, so that the pipe receives by its working an increased diameter. Further more. a similar-rolling mill is, known, in

which the rolls are at an opposite angle arranged obliquely to the longitudinal direction of the machinein order to produce also an advance of. the pipe in the longitudinal direction, the pipe being clamped fast so that it cannot turn on its own axis while the rolls are arranged in a casing revolving around the pipe, It has also been proposed in a similar rolling mill of which the obliquely arranged rolls produce helical grooves on the pipe,,to insert, between the I single stock-casings carrying the rolls, smoothing rollers for smoothing the bulbs formed between the rolled grooves.

From this known art, the present invention is distinguished bythe fact that. a seamless pipe is rolled from a rotating hollow block by separating part of the material of the block from the remaining part by the utilization of rollerpairs of gradually increasing width and of adiustable working depth uniformlv distributed over the circumference of the block along a helical line behind each other, each roller pair acting both from inside and outside upon said block, thereby producing a circumferential nick in the block beginning adjacent one end of the block and graduallywidening said nick toward said end. r

In the accompanying drawings,

Figs. 1 to 4 show diagrammatically the difierent successive steps of treatment of the wall of, the hollow block (shown in longitudinal section) by the pairs of rolls;

Figs. 5 to 8 show similar views to the former, of a different mode of application of the pair of rolls to the wall of the hollow block.

Figs. 9 and 10 show respectively in a perpendicular central section and in asectional plan view, a preferred constructional form of the improved rolling mill in which the hollow block is treated while in its perpendicular position and moved in perpendicular direction, While Fig. 11 shows a longitudinalcentral section of another rolling millembodying the present inventionv in which the hollow block is treated while in its horizontal position and moved in horizontal direction.

Referring to Figs. 1 to 4: First, a pair of narrow rolls 2, 3 produces during its revolution a circumferential nick in the wall-1 of the hollow block at a short distance from one end of the latter, which nick is then gradually widened toward said end by other pairs of rolls 4, 56, 7-8, 9 of inoreasi g width until it is flush with said end. in this example, the pairs of rolls produce the nick in the. wall of the hollow block from inside and outside at the same time.

:Referring to Figs. 5 to 8, only one roll of the'pairs of rolls, for instance the inner one, 24 -8*,' acts to produce the circumferential nick, while theother one, 5 7 serves as a counterbearing only, for which purpose it can be of equal,

rather broad width, in all pairs of rolls,

Referring to Figs. 9 and 10: The rolling mill illustrated, has four pairs of rolls 2", 3 -4 5"6", 7 and 8, the outer one of this latter pair being not shown on the drawing. The outer rolls thereof are mounted in supports 10, which. can be adjusted with reference to the hollow block 1, for the purpose of regulating the depth of the circumferential nick to be produced therein and thus the desired wall thickness of the seamless pipe, in a frame 11 by means of a screwgear 12, 13; the driving of the rolls being effected from driving-spindles 14 by means of bevel- gea'rings 15, 16. The inner rolls are mounted in supports 17, which are radially slidable in a correspondingly designed head 18 of a stationary upright cylinder 29 around" which the hollow block 1 is located, the inner ends of said supports being in contact with a-wedge-pieoe 19 arranged in said cylinder and adapted to be adjusted, for regulating the depth of the nick and thus the desired wall thickness of the seamless pipe, by means of ascrew- gear 20, 21. The pairs of rolls are uniformly distributed over the circumfer- I ence of the block and arranged along a helical line behind each other, so that first the rolls 2", 3 act upon the hollow block 1, then the rolls 4*, 5 and 6, 7 and finally the pair of rolls 8", of which one only is shown. As

aforementioned, thereby, part of the material is separated from the remaining part diametral direction, whereby the rolls and their supports aid in balancing those forces issuing from the work-piece and having a one-s1 e rolls. The hollow block is during its treatment rotated, so that the part worked by the first pair of rolls 2", 3 is then offered to'th'e action of the second pair, and so on. The rotation of the hollow block 1 is effected partly, or exclusively, by the driving gear of the pairs of rolls. The latter can also be used at the same time for advancing the hollow blockl provided that their axes, corresponding to the helical line, are located in oblique direction to the axis of the hollow block. Separate supporting-rollers (not illustrated) may be provided for maintaining the hollow block in its perpendicular position.

Referring to Fig. 11: The hollow block 1 is here worked in its horizontal position.

' The head 22 carrying the four inner rolls,

of which 2 and 6 only are shown, is arranged on a; horizontal arm 23, which is turnably mounted on t'ru'nnions 24 in a frame 25, the free end of said arm carrying a counterweight 26 The dis lacement of the wedge-piece 19, which is xed to a screwrod 27, takes place byan adjusting nut 28 on the latter. Separate supporting-rollers (not illustrated) must be provided for carrying (1 direction toward the centres of the "the hollow block 1 in its horizontal position. The other reference letters indicate similar parts to those in Fi 9 and 10, namely: 17 the radially adjusta le supports for the inner rolls adapted to be acted upon by the wedge-piece 19; 10' the adjustable supports for the outer rolls in the frames 11 and 12, 13 and 14, 15, 16 the driving-gears for the outer rolls.

The arrangement shown in Figs. 9 and 10, is, however, more advantageous by reason of the cylinder 29 being not exposed to bending strains by the weight of the head 18 and the inner rolls, so that it can be thin-walled and thus suflicient room is gained therein for mounting the wedge-piece 19.

Instead of four pairs of rolls illustrated, of course, any other appropriate number can be used according to actual circumstances.

What I claim, is:

The herein described method of rolling seamless pipes from a rotating hollow block, which consists in separating part of the material of the block from the remaining part by the utilization of roller pairs of gradually increasing width and of adjustable working depth uniformly distributed over the circumference of the block along a helical line behind each other, each roller pair acting both from inside and outside upon said back, thereby producing a circumferential nick in the block along a helical line beginning adjacent one end of the block and widening said nick toward said end.

In testimony whereof I have hereunto setmy hand.

- MARTIN ROECKNER.

'45 which can be adjusted by the screw-gears

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