US3717018A - Method and mill for skew rolling - Google Patents

Method and mill for skew rolling Download PDF

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Publication number
US3717018A
US3717018A US00111000A US3717018DA US3717018A US 3717018 A US3717018 A US 3717018A US 00111000 A US00111000 A US 00111000A US 3717018D A US3717018D A US 3717018DA US 3717018 A US3717018 A US 3717018A
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US
United States
Prior art keywords
rolling
line
mandrel rod
billet
rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00111000A
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English (en)
Inventor
M Bellman
G Pfeiffer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vodafone GmbH
Original Assignee
Mannesmann AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19702005029 external-priority patent/DE2005029C/de
Application filed by Mannesmann AG filed Critical Mannesmann AG
Application granted granted Critical
Publication of US3717018A publication Critical patent/US3717018A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
    • B21B25/06—Interchanging mandrels, fixing plugs on mandrel rods or cooling during interchanging mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers

Definitions

  • the present invention relates to the art of making seamless, pierced billets or tubing by means of skew rolling a solid or hollow billet onto a piercing mandrel on a mandrel rod.
  • the rolling mill in which the invention is practiced includes the'required rolls as well as means for stripping a rolled, pierced billet or tube off the mandrel rod.
  • the resulting pierced billet is progressively shifted onto the mandrel rod.
  • the mandrel as then disposed under the rolls is removed first.
  • the pierced billet is removed from the stand, and the rod, together with the thrust block holding the rod, is displaced sufficiently far so that the rod is being completely pulled out of the billet.
  • the billet is removed from the rolling path for further working.
  • the next rolling step can begin only thereafter, and for this it is necessary first to return the thrust block and mandrel rod to working and operating position.
  • the thrust block In view of the large pressure forces set up during rolling, the thrust block must be quite heavy and very stably supported in its track. Thus, the delay or timeout in between two rolling steps as taken up by the aforedescribed removal and preparatory steps is quite large. In order to reduce this period, it has been suggested to merely move the thrust block sufficiently far for permitting removal of rod and billet from the stand, and the block is provided with a passage, through which the rod can be pulled as it is withdrawn from the billet.
  • the rolling path is thus cleared in the shortest possible time, just sufficient to remove the rod with billet while a new rod is more or less concurrently put into place. It is no longer necessary to remove the mandrel first, stripping the billet off the rod, and to replace the mandrel head on the same rod. Instead, the rods circulate with the mandrel remaining in place.
  • the billet can be stripped off a removed rod rather slowly and carefully so as to avoid any damage to the product.
  • the two rod moving steps-removal of the one carrying the billet and placing a different one in position may commence simultaneously or at least follow each other directly. In either case, it was found that the capacity of the mill could be doubled if this new principle of mandrel rod circulation is introduced.
  • a rolling mill in which the invention is practiced has the usual equipment, e.g., rolling stand, mandrel rod centering equipment and thrust block.
  • coupling means to permit release and removal of a mandrel rod from the thrust block. The latter is moved only very little, and in longitudinal direction only, just sufficient so that a billet clears the rolls in the stand.
  • tracks are provided for transporting the rods so as to sustain the circulation. Some of these tracks are additionally used to strip off and to remove the billet.
  • the transport tracks extend in parts parallely to the line of rolling, but they are laterally displaced therefrom on opposite sides of the rolling path.
  • a rod collecting and cooling facility closes the rod circulation.
  • Means are provided to remove a rod with billet from the rolling path onto one of the transport tracks, while other means remove anew rod from the other transport track and place same onto the rolling path for coupling to the rod holding thrust block.
  • the centering means for mandrel rod and billet in the line of rolling can be folded back for this rod replacement operation.
  • FIG. 1 is a schematic, top elevation of a skew rolling mill improved in accordance with the invention.
  • FIG. 2 is a section view, taken between thrust block and skew rolls.
  • FIG. 1 a rolling stand 1 with rolls 3 and 5 for skew rolling.
  • Solid or already pierced billets are fed to the rolls in the direction of arrow 7; the billet feed mechanism is not shown as it is conventional.
  • Arrow 7 defines also the axis or line of rolling, the rolling path extends to the left of stand 1.
  • a mandrel 9 such as a piercing mandrel is disposed between the rolls and maintained in position by means of a mandrel rod 11.
  • the rod 11 is connected to a thrust block 13 via a coupling 15 that is easily releasable.
  • rod 11 is centered by means of several, three-roller centering devices 17.
  • Driving rolls 19 are disposed in alignment with rod 11, the direction being that of the line of rolling.
  • Driving rolls 19 are adjustable as to the diameter of the billet as rolled.
  • a longitudinally advancing and transport mechanism or track is disposed parallel to but laterally displaced from the line of rolling.
  • This transport mechanism advances billets and rods when removed from the rolling path, and in the direction of rolling.
  • This track includes driving rollers 21 and 21' as well as a device 23 for holding the mandrel rod.
  • An open roller track 25 is disposed behind rolls 21.
  • a transverse roller track 49 is provided behind roller track 25; track 49 is selectively reversible as indicated by the double arrow.
  • levers 29 are provided, turning on an axis 27 for swinging a used rod out of the rolling axis onto rollers 21, while levers 33 are provided, turning on an axis 31, for swinging a new rod onto the rolling axis.
  • rod-feeding device 35 receiving rods from a supply 37 of spare rods. Levers 33 place such a rod from rolls 35 into the rolling path, once the rod previously used has been removed from that path.
  • the rod feed mechanism is an open roller track 35 for advancing a rod from supply 37 toward the rolls of the mill, but laterally displaced thereof.
  • a mandrel rod when in the rolling path is centered by means of rolls 17 as stated, and such centering devices include three rolls each supported on interconnected rocking levers 39, 41 and 43. These levers 39, 41 and 43 can be swung out of the way to permit removal of a rod from the rolling path and replacement by a new one.
  • the rod placing and swinging levers 29 and 33 are similarly constructed. They pivot on their respective axes, and their free ends are provided with forklike rod holders 45.
  • the forks themselves can pivot on the respective lever ends.
  • the forks pivot respectively in unison with the turning of the levers 29 and 33 when holding rods, sothat a fork 45 when holding a rod always points in an upward direction, as illustrated, permitting such gripping, holding and swinging of rods.
  • Chains 47 are provided to transmit position-dependent motion from axes on shaft 31 or 27 to the respective fork element 45.
  • levers 33 and 29 may be allowed to rotate completely about 360 so as to return to their respective normal positions, so to speak, from below; e.g., for lever 29 with its fork holder to return to the rolling path after having swung a mandrel rod with billet to deposit them onto the rollers 21.
  • the arms and forks 45 may be constructed to be swung out of the way completely after having disposed a rod with billet onto rolls 21 so that the levers 29 can reverse their motion, without lifting the just disposed rod with billet off the rolls 21 again.
  • the situation is analogous for levers 33 with their forks 45 as handling the disposition of a new rod into the line of rolling.
  • the inclined-roll 21' establishes a pair of driving rolls, together with the respective roll 21 underneath, for stripping the pierced billet off the mandrel rod once such rod with billet has been disposed on rolls 21.
  • the roll 21 must be capable of pivoting transversely to its axis so that the mandrel rod with billet can be so disposed onto rolls 21.
  • the rolling mill operates as follows: After a rolling step, a completed, i.e., cogged, pierced billet is disposed on a mandrel rod 11 and held thereon by means of rollers 19. Billet and rod are removed together from the rolling stand by these rollers 29 and to the left thereof (FIG. 1). Concurrently, thrust block 13 is displaced to assume the position as shown in dashed lines, the mandrel rod follows that movement; so does the billet thereon. Now, as rod 11 with mandrel 9 has left stand 1, coupling 15 is opened to free rod 1 l. The billet as gripped by the forks on levers 29 are swung out of the rolling path and onto transport rolls 21, the mandrel rod is still in the billet.
  • levers 29 As soon as the levers 29 have swung mandrel rod with billet out of the rolling path, levers 33 as holding another mandrel rod swing same into the rolling path, and particularly the one end of the rod is placed into position for connection to coupling 15. Now thrust block 13 is returned to working position. Still in the same period a new, unrolled billet has been placed into position (to the right of rolls 3, 5) so that a new rolling operation can take place. During this rolling, a new mandrel rod is advanced by rolls 35, but levers 33 have first swung back into position to be able to grip that new rod. Also, the billet as rolled previously is slowly stripped off its mandrel rod, as described, during this subsequent rolling step; the same holds true for the return of that rod to the supply. Still during this subsequent rolling step a new rod is taken from supply 37 and advanced by rollers 35 to be ready as replacement. Thus, for the system to operate efficiently, at least three rods are needed.
  • a mandrel rod may be subject to inspection and be removed from circulation if damaged.
  • speedy operation will not suffer if there is a sufficient number of spare mandrel rods in the supply 37, and if damaged rods are repaired and/or replaced to maintain the minimum of three.
  • the removal step comprising swinging the mandrel rod with billet laterally out of the line of rolling
  • the placing step comprising swinging the different mandrel rod laterally into the line of rolling and from the opposite side of the line of rolling.
  • gripping means disposed alongside the line of rolling between skew rollers and the thrust block for removing a mandrel rod with rolled tubular billet lateral from the line of rolling to one side thereof;
  • gripping means disposed also alongside the line of rolling between the skew rollers and the thrust block for placing a different mandrel rod into the line of rolling and from the other side thereof for use in the next rolling step;
  • stripping equipment disposed outside of the line of rolling for separating the rolled tubular billet from the removed mandrel rod during the next rolling step and including holding means for temporarily holding the mandrel rod and disposed next to the skew rollers, further including conveyor means leading from the holding means alongside the line of rolling towards and in back of the thrust block,
  • Rolling mill as in claim 5, including laterally pivotable centering means fora mandrel rod when in a line of rolling, and disposed between the skew rolls and thrust block.
  • the conveyor means including a first roller track disposed alongside the line of rolling onto which the first gripping means disposes a mandrel rod with billet, the returning means including a second roller track disposed alongside the line 0 rolling but on the other side for advancing a mandrel rod for engagement by the second gripping means.
  • roller tracks running parallel to the line of rolling, the first roller track running in the same direction as rolling of the billet in the line of rolling, the second roller track running in the opposite direction.
  • the returning means including transverse transport means closing a circulation path between the first and second roller tracks.
  • Rolling mill as in claim 9 there being means for cooling in the circulation path, for cooling a mandrel rod prior to placement onto the second track.
  • the first and secondgripping means each including a plurality of levers with holding forks for receiving the respective rods.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
US00111000A 1970-01-30 1971-01-29 Method and mill for skew rolling Expired - Lifetime US3717018A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702005029 DE2005029C (de) 1970-01-30 Verfahren zum Handhaben eines durch Schrägwalzen eines Massiv oder Hohl blockes erhaltenen gelochten und/oder gestreckten Hohlkörpers

Publications (1)

Publication Number Publication Date
US3717018A true US3717018A (en) 1973-02-20

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US00111000A Expired - Lifetime US3717018A (en) 1970-01-30 1971-01-29 Method and mill for skew rolling

Country Status (4)

Country Link
US (1) US3717018A (enrdf_load_stackoverflow)
FR (1) FR2080943B1 (enrdf_load_stackoverflow)
GB (1) GB1329895A (enrdf_load_stackoverflow)
SE (1) SE381829B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592222A (en) * 1983-09-13 1986-06-03 Mannesmann Aktiengesellschaft Device for the delivery and removal of the mandrel rods in skew and longitudinal rolling mills
US6497129B2 (en) * 2000-06-14 2002-12-24 Sms Demag Ag Method for rolling tube blanks in a planetary skew rolling mill

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1086314B (it) * 1977-09-19 1985-05-28 Innocenti Santeustacchio Spa Gabbia di sostegno e guida del mandrino in laminatoi continui a mandrino trattenuto
FR2418037A1 (fr) * 1978-02-23 1979-09-21 Vallourec Procede et dispositif de laminage
IT1151443B (it) * 1982-06-03 1986-12-17 Innocenti Santeustacchio Spa Apparecchiatura per il sostegno della stanga portapunta di una macchina di perforazione assiale a caldo di billette,lingotti e simili
IT1153201B (it) * 1982-10-04 1987-01-14 Innocenti Santeustacchio Spa Metodo e relativa apparecchiatura per la ricircolazione dei mandrini in un laminatoio operante a mandrino trattenuto, per la produzione di tubi senza saldatura
EP0698426A1 (de) * 1994-08-18 1996-02-28 MANNESMANN Aktiengesellschaft Walzdornwechselvorrichtung für Stopfenwalzwerke
GB0008286D0 (en) 2000-04-04 2000-05-24 Applied Materials Inc A vaporiser for generating feed gas for an arc chamber

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US742200A (en) * 1901-12-26 1903-10-27 George H Blaxter Apparatus for manufacturing seamless tubing.
US1453203A (en) * 1923-04-24 Tube-kolling mill
US1919637A (en) * 1930-09-23 1933-07-25 Jones & Laughlin Steel Corp Tube manufacture
US1986833A (en) * 1931-02-04 1935-01-08 Carl W Littler Manufacture of tubes by the push bench process
US2024514A (en) * 1933-03-25 1935-12-17 Diescher Tube Mills Inc Method and apparatus for making tubes
SU144133A1 (ru) * 1961-07-12 1961-11-30 шина Л.А. Андри Четырехроликовый центрователь прошивных и обкатных станов трубопрокатного агрегата
US3348399A (en) * 1964-08-04 1967-10-24 Mckay Machine Co Methods of and apparatus for forming tubular members

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE440647C (enrdf_load_stackoverflow) *
US1946933A (en) * 1932-03-31 1934-02-13 Diescher Tube Mills Inc Tube-making apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1453203A (en) * 1923-04-24 Tube-kolling mill
US742200A (en) * 1901-12-26 1903-10-27 George H Blaxter Apparatus for manufacturing seamless tubing.
US1919637A (en) * 1930-09-23 1933-07-25 Jones & Laughlin Steel Corp Tube manufacture
US1986833A (en) * 1931-02-04 1935-01-08 Carl W Littler Manufacture of tubes by the push bench process
US2024514A (en) * 1933-03-25 1935-12-17 Diescher Tube Mills Inc Method and apparatus for making tubes
SU144133A1 (ru) * 1961-07-12 1961-11-30 шина Л.А. Андри Четырехроликовый центрователь прошивных и обкатных станов трубопрокатного агрегата
US3348399A (en) * 1964-08-04 1967-10-24 Mckay Machine Co Methods of and apparatus for forming tubular members

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592222A (en) * 1983-09-13 1986-06-03 Mannesmann Aktiengesellschaft Device for the delivery and removal of the mandrel rods in skew and longitudinal rolling mills
US6497129B2 (en) * 2000-06-14 2002-12-24 Sms Demag Ag Method for rolling tube blanks in a planetary skew rolling mill
AU775845B2 (en) * 2000-06-14 2004-08-19 Sms Demag Aktiengesellschaft Method for rolling tube blanks in a planetary skew rolling mill

Also Published As

Publication number Publication date
DE2005029B2 (de) 1973-02-08
FR2080943B1 (enrdf_load_stackoverflow) 1974-02-15
GB1329895A (en) 1973-09-12
FR2080943A1 (enrdf_load_stackoverflow) 1971-11-26
DE2005029A1 (de) 1971-08-12
SE381829B (sv) 1975-12-22

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