US2090535A - Process and apparatus for the production of seamless tubes - Google Patents

Process and apparatus for the production of seamless tubes Download PDF

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Publication number
US2090535A
US2090535A US95250A US9525036A US2090535A US 2090535 A US2090535 A US 2090535A US 95250 A US95250 A US 95250A US 9525036 A US9525036 A US 9525036A US 2090535 A US2090535 A US 2090535A
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United States
Prior art keywords
tube
rolls
rolling
production
piston
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Expired - Lifetime
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US95250A
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English (en)
Inventor
Knoll Werner
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Individual
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Individual
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Publication of US2090535A publication Critical patent/US2090535A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills
    • B21B21/04—Pilgrim-step feeding mechanisms

Definitions

  • This invention is for improvements in or relating to a rolling process for the production of seamless tubes in which Pilger rolls are employed and in consequence the work is rolled out inter- 5 mittently.
  • the invention has for its object improvements in rolling processes employing Pilgerrolls where by improved tubes are produced having the advantages hereinafter described.
  • the tube in a rolling process for the production of seamless tubes employing Pilger rolls, the tube is subjected during the rolling operation to a tensional force acting in the direction in which the rolls tend to. push the tube.
  • This tensional force can, in the case of Pilger step rolling mills having stationary roll holding frames, be applied by a feed device, or in the case of Pilger step rolling mills having movable roll holding frames and oscillating or 20 rotating rolls, this force can be appliedloy the horizontal drive of the roll frames.
  • the usual rigid coupling between horizontal ,movement of the roll frame and-rotary movement of the rolls is preferably dispensed with.
  • the tensional force which is applied to the tube is regulated and this in such manner that any slip between the roll and the work is obviated.
  • the regulation can extend over the tensional force applied during a single stroke or during the Whole rolling process, in view of the different resistances to shaping in the course of the individual stroke and of the whole rolling out process of the tube, since the wave of ma-.
  • terial rolled out with each stroke is a maximum 5 at the commencement of the stroke and disappears at the end.
  • the process according to the invention is not restricted to the treatment of the material in the hot state, for the prdcess has also great advantages in the cold Working of tubes by Pilger rolls.
  • the advantage as compared with the known Pilger step rolling process resides in so controlling the conditions under which the shape of the tube is varied that during each rolling operation the so-called back bulge is avoided.
  • This back bulging led, particularly in the production of" thin walls, to the formation of fissures or faults in the wall of the tube and prevented large reductions in cross-section.
  • the advantage of a better variation in the shape causes also, with the cold shaping, the elimination of a harmful solidification of the structure. It is thus possible to make pieces of work, inparticular tubes, with a smoother surface and thinner wall than hitherto, in the manner given.
  • a mandrel 3 is fed between Pllgerj rolls l whichare rotated in the direction of the arrows.
  • the tube 2 is connected to the mandrel frame 15 4 by a fixing and clamping device 5, so that a tensional force can be transmitted from the feed device on to the tube.
  • the clamping device 5 can act on the tube from the outside or from the inside.
  • the clampingdevice 5 consists of two or more pivoted grippers, one end of which rests on the tube whilst the other end is regulated b-y 'an adjusting device in the form of screws.
  • the ends ofthe grippers which make 5 contact with the tube are provided with points which penetrate into the surface of the tube in i order to increase the holding efiect thereof.
  • clamping jaws as are used in known man- 30 her on a clamping chuck, can also be employed for gripping the tube 2.
  • the feed of the tube to the rolls is controlled in the following manner.
  • a hydraulic brake for braking the feed movement.
  • the brake piston l is preferably in the form of a hollow cylinder and is connected at its front end to a steeply threaded spindle M connected to the mandrel framed.
  • a second piston t Within the 40 hollow piston l is provided a second piston t firmly connected with the housing 6 and by means of which, through the supply of a tensioning medium, such as air, steam or the like,
  • the brake piston can be moved from left to 45 right and vice versa.
  • the regulation of the tensioning medium and thus the regulation of the tensional force exerted on the tube 2 is preferably efiected under the influence of the position of the rolls l.
  • the regulation of the ten- 50 sionalforce can be effected, for example, by a suitable regulation of the valves controlling the supply of the tensioning medium, e. g., compressed air or the like.
  • Such a regulation of the valves can be effected, for example, by means 55 I of a cam shaft, the arrangement being such thatthe cams control the raising and lowering of the valves in accordance with the working of therolls.
  • the drive for the cam shaft can be derived directly from the drive for the Pilger rolls I or may be effected independently by means of a regulatable direct current motor.
  • the drawing shows, by way of example, the piston l at the instant of its movement towards the rear end of the housing at the right.
  • the tensioning medium passes through the pipe 9 into the space H .and operates to move the brake piston l to the right.
  • This movement is tranc- 16 mitted through the spindle HI, the mandrel frame 4 and the clamping device 5 to the tube 2. Since this movement takes place whilst the rolls are' working the tube 2, the rolling process is supplemented by the tensional force thus exerted on the tube in accordance with the main feature of the invention.
  • the brake piston I has reached the rear dead position at the right, the rolls 1 have then released the tube 2.
  • valves are then suitably controlled to supply the tensioning medium to the pipe in from whence said medium passes through the axial bore i2 of the stationary piston rod 8 into the interior'of the piston 13.
  • the piston I is thereby moved to the left and the '1 tube is again brought between the rolls I.
  • the tube 2 undergoes an axial rotary movement by means of the spindle l4 and a ratchet wheel I5 engaging therewith on this stroke of the piston'l.
  • the rolls I again engage with the tube and the process, commences afresh.
  • a mandrel for accommodating a tube to be rolled and arranged to be drawn between said rolls, a draw'rod connected at one end to said mandrel and at the other end to a feeding device and an adjustable gripping device associated with the said 25 end of said draw rod to which said mandrel is connected and arranged to grip a tube to be rolled when said tube is mounted in position on the mandrel and to exert on said tube a tensional force acting in the direction in which said rolls tend to push said tube during the rolling-operation.
  • a feeding device for feeding a tube between said 85 rolls, said feeding device comprising a fluid operated piston, means for imparting to said piston a reciprocating motion and means for connecting said feeding device and tube to exert on a tube between said rolls and in one direction of move- 60 ment of said piston a tensional force which acts on said tube in the direction in which said rolls tend to push said tube during the rolling operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
US95250A 1935-02-26 1936-08-10 Process and apparatus for the production of seamless tubes Expired - Lifetime US2090535A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE470979X 1935-02-26

Publications (1)

Publication Number Publication Date
US2090535A true US2090535A (en) 1937-08-17

Family

ID=6541211

Family Applications (1)

Application Number Title Priority Date Filing Date
US95250A Expired - Lifetime US2090535A (en) 1935-02-26 1936-08-10 Process and apparatus for the production of seamless tubes

Country Status (3)

Country Link
US (1) US2090535A (fr)
FR (1) FR806016A (fr)
GB (1) GB470979A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2814962A (en) * 1953-02-27 1957-12-03 Wellman Smith Owen Eng Co Ltd Manufacture of seamless metal tubes
US3240045A (en) * 1962-10-15 1966-03-15 Prec Sheet Metal Inc Arrangement for contouring tubes
US4145906A (en) * 1978-02-21 1979-03-27 Proizvodstvennoe Obiedinenie "Elektrostaltyazhmash" Feeding device of a tube cold-rolling mill

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3018612C2 (de) * 1980-05-13 1985-10-31 Mannesmann AG, 4000 Düsseldorf Vorrichtung zum Anpilgern
DE3008820C2 (de) * 1980-03-06 1982-02-18 Mannesmann AG, 4000 Düsseldorf Vorrichtung zum Anpilgern eines Hohlblockes
CN103394511A (zh) * 2013-07-23 2013-11-20 衡阳华菱钢管有限公司 无皮尔格头的钢管轧制方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2814962A (en) * 1953-02-27 1957-12-03 Wellman Smith Owen Eng Co Ltd Manufacture of seamless metal tubes
US3240045A (en) * 1962-10-15 1966-03-15 Prec Sheet Metal Inc Arrangement for contouring tubes
US4145906A (en) * 1978-02-21 1979-03-27 Proizvodstvennoe Obiedinenie "Elektrostaltyazhmash" Feeding device of a tube cold-rolling mill

Also Published As

Publication number Publication date
FR806016A (fr) 1936-12-05
GB470979A (en) 1937-08-25

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