US3625044A - Method and means for introducing a mandrel into a tubular bloom - Google Patents

Method and means for introducing a mandrel into a tubular bloom Download PDF

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Publication number
US3625044A
US3625044A US855168A US3625044DA US3625044A US 3625044 A US3625044 A US 3625044A US 855168 A US855168 A US 855168A US 3625044D A US3625044D A US 3625044DA US 3625044 A US3625044 A US 3625044A
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United States
Prior art keywords
mandrel
bloom
shell
velocity
rolling
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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
US855168A
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English (en)
Inventor
Manfred Bellmann
Erhard Hentzschel
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Vodafone GmbH
Original Assignee
Mannesmann AG
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Publication date
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Publication of US3625044A publication Critical patent/US3625044A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels for metal drawing
    • B21C3/16—Mandrels; Mounting or adjusting same
    • 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
    • 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
    • B21B25/02—Guides, supports, or abutments for mandrels, e.g. carriages or steadiers; Adjusting devices for mandrels

Definitions

  • a mandrel is introduced into a tubular bloom for subsequent rolling.
  • the bloom lies in front of the rolling mill and is first moved slowly toward it, and the mandrel is pushed into and through the bloom at a velocity which is a multiple of that of the bloom to a point such that a predetermined length of the mandrel will protrude from the front end of the bloom, and the velocities of the two are then synchronized.
  • the invention relates to a method and an apparatus -for introducing a mandrel into a tubular bloom or shell, which subsequently is rolled out to a tube through a continuous rolling process.
  • chain drives which through entrainment means (such as forks, pins, etc.) push the mandrel through the shell and by means of a mechanically adjustable stopping device introduce the mandrel and the shell jointly into the rolling mill along a pathway which had -been accurately established.
  • This joint introduction of mandrel and shell is frequently carried out by means of a second chain drive.
  • the forces and accelerations which are necessary for the fast movement are not limited; however, in addition to the high expenditures for mechanical devices and their maintenance, the possibility does not exist of transmitting forces for slowing down the conveyed pieces.
  • a spoonshaped device which is propelled through chains, ropes or other mechanical or hydraulic driving means.
  • a mechanically adjustable pathway it first transports the mandrel and subsequently jointly transports the mandrel and the thick-walled shell into the continuous rolling mill.
  • these aims are accomplished as follows: the bloom which lies in front of the rolling mill, in first moved slowly toward the rolling mill, while the mandrel with a velocity which amounts to a multiple of the bloom velocity is pushed in the same direction into and through the bloom to such a distance that a piece of the mandrel, the size of which corresponds to the length increase from -bloom to finished tube, protrudes beyond the front end of the bloom.
  • the velocities of bloom and mandrel are then synchronized and adjusted to the rolling velocity of the first rolling stand.
  • the device for the execution of this method is primarily characterized in that for the movement of the mandrel a roller-bed is provided having attraction means to generate friction which goes beyond the frictional connection brought about by the weight of the mandrel itself.
  • these attraction means include electromagnets which act upon the mandrel and are arranged below it. These electromagnets are connected with a polarity which changes with the guide motion of the mandrel. Seen in the direction of the mandrels guide motion, a demagnetization spool is provided behind the roller-bed. The latter can be provided with a pressure-gas unit, which brings about an overpressure at the pole shoes.
  • a bloom driving apparatus includes oH-set pairs of rollers and has an operating axis which lies in the elongation of the rolling bed axis.
  • rollers that lie above the bloom can be adjusted in a stationary manner, whereas those rollers which lie below the bloom can be raised and lowered in vertical direction and can be pressed from below against the bloom.
  • the invention includes a photoelectric cell disposed behind the roller-bed and an infra-red cell provided behind the driving apparatus. Digital odometrical devices are provided which are located ahead of the photoelectric cell and the infra-red cell. A computer is connected to said digital odometrical devices which controls or guides the driving mechanisms of the rolling bed and the driving device.
  • the invention consists in the novel methods, conv struction, arrangement and combination of various devices, elements and parts, as set forth in the claims hereof, certain embodiments of the same being illustrated in the accompanying drawings and described in the specification.
  • FIG. 1 is a fragmentary side elevational view of a device in accordance with the invention.
  • FIG. 2 is a plan view thereof
  • FIG. 3 is a fragmentary elevational view of a detail
  • FIG. 4 is an end elevational view partly in section.
  • the apparatus designed in accordance with the present invention includes a number of rollers 3 which are driven by electromotive means and are adjusted to the profile of the goods to be conveyed.
  • the rollers 3, which are mounted in an adjustable manner above the corresponding bearing and holding devices, are set up together with electromagnets 4.
  • the magnets 4 are arranged in adjustable manner between the rollers. They are on a mount base, the position of which can likewise be adjusted (FIGS. 1 and 2, section A).
  • the electromagnets 4, which are screened in .order to prevent stray fields, are laid out in such a :nan-
  • the magnets 4 are fed in such a manner that successive magnets are polarized in opposite directions.
  • the device according to the instant invention For transporting the rolled stock, namely the bloom or shell 7, the device according to the instant invention includes a number of upper and lower rollers which are propelled by electromotive means and are adjusted to the prole of the goods to be conveyed. Each pair of upper and lower rollers form a propelling device.
  • the upper rollers 11 can be adjusted as to position, they are usually arranged -in a stationary manner for the normal operational cycle.
  • the lower rollers 10 in accordance with a preferred embodiment of the instant invention can be jointy adjusted vertically in such a manner by a hydraulically operated, pressure controllable rapid lifting stroke.
  • a digital odometrical device 14 which is likewise connected with the rolled stock in a slip-free manner permits accurate steering of the rolled stock 7 with respect to its position to the mandrel 1 and to the continuously operating (so-called Konti) rolling mill.
  • the mandrel 1 which is received from a cooling vessel is conveyed by means of conventional interjectors through a delivery grate (not illustrated) to the roller bed 3. As soon as the mandrel 1 has reached this position, the magnets 4 are switched on.
  • the exact length of the shell 7 was determined after the preceding rolling process.
  • the position of the shell 7 within the intake or feeder roller bed 10, 11 is defined by a stop on the transport through the prime chain mover 6.
  • the mandrel 1, after it has passed the photo cell 8 which determines its exact position can be brought into a waiting position, after travelling a certain path at slow speed which is controlled by the digital odometric device 13. In this waiting position, the head of the mandrel 1 remains a short safety distance from the end of the shell 7.
  • the shell 7 which is conveyed by the seats or bearing surfaces 9 of the prime chain mover 6, is stopped, and then lifted by the lower rollers 10 to the rolling center and is pressed by regulatable pressure against the upper rollers 11 (FIG. l, section B and FIG. 3). Once the shell 7 has reached this basic position, motional actions of diiferentiable acceleration and velocity, of both the mandrel 1 and the shell 7, are simultaneously initiated. During the ensuing operation, the mandrel 1 is driven through a lubricating device 15 and into the shell 7.
  • the shell 7 is led past an infra-red cell 5 with a relatively slow velocity, whereby its momentary position is defined by the digital odometric device 14 which is coupled with it.
  • This slow motion of the hot shell 7 in the direction towards and continuously operating (the socalled Konti) rolling mill 12 is arranged in accordance with the instant invention so that the heat removal through the propelling rollers 10 and 11 cannot elfect to a great degree a localized temperature diiference.
  • the mandrel 1 As the heat potential of the mandrel is low as compared to that of the shell 7, the mandrel 1 will receive a large quantity of heat from said shell 7 after 4it engages the shell. For this reason it is hepful to keep the contact-time between the mandrel 1 and the shell 7 as short as possible prior to the actual rolling process.
  • the stretching which can be divided 4into forward and a backward direction is dependent on the construction of the roller mill 12 which is used in the rolling process.
  • the element of length is also established with which the mandrel 1 must protrude, in the rolling direction, from the shell 7 prior to the start of the rolling process.
  • This protrusion of the mandrel 1 from the shell 7 will be for a certain calculable distance, and is controlled, through a computer, by the digital odometric devices 13 and 14 which operate in differential connection.
  • the computer then computes the particular point along the travelled path at which the retardation steps are to be initiated.
  • This particular point is determined from the mandrel velocity and the shell velocity, the mandrel retardation of 5 meters per second squared, and more, the computed distance between the mandrel 1 and the shell 7, as well as from the velocity with which the mandrel 1 and shell 7 are driven in. This is arranged to correspond to the rolling velocity of the irst rolling frame of the so-called Konti roller mill 12.
  • the retardation is kept constant up to the time at which the velocity with which the mandrel and the shell are driven-in is attained. While taking the same factors into account, the shell 7 is correspondingly accelerated from the slow travel time to the driving-in velocity, so that mandrel and shell are synchronously introduced into the lirst rolling frame of the so-called Konti rolling mill 12.
  • the Velocity of the rolled stock 7 and of the mandrel 1 is only determined by the rolling mill 12 itself.
  • a device for the introduction of a movable mandrel into a movable hollow tubular bloom situated in front of a rolling mill comprising, in combination,
  • a irst roller bed operable for moving said bloom with a slow velocity in a direction towards said rolling mill
  • a second roller bed operable for moving the mandrel in the same direction though with a velocity which amounts to a multiple of the bloom velocity into and through the bloom
  • said second roller bed including means operable to generate a friction in addition to 6 the gravitational frictional connection brought about by the weight of the mandrel itself.
  • a device, as claimed in claim 2, wherein the means to generate friction include electromagnets which act upon the mandrel and are arranged below the same.
  • a device as claimed in claim 3, wherein the magnets are connected with a polarity which changes with the movement of the mandrel.
  • a device as claimed in claim 2, wherein viewed in the direction of the movement of the mandrel, a demagnetizing spool is disposed behind the roller-bed.
  • a device as claimed in claim 3, said magnets having pole shoes, and a pressure gas unit, which creates an overpressure at said pole shoes.
  • a device, as claimed in claim 2, said first roller bed having an axis, first driving means for moving said bloom comprising pairs of rollers and having an operating axis which lies in the elongation of the roller bed axis, some of said rollers lying above the bloom -being adjustable in a stationary manner, and others of said rollers being arranged below the bloom and being operable to be raised and lowered in vertical direction and to be pressed from below against the bloom, and second driving means for moving said mandrel.
  • said second measuring combination including a photoelectric cell disposed behind the second roller bed and operable for determining the position of said mandrel viewed in the direction of the movement of the. mandrel, said iirst measuring combination including an infrared cell disposed behind the said lirst driving means, and operable for determining the position of said bloom, said odometric devices being disposed frontally of said photocell and said infrared cell, and a computer connected to said odometric devices and to said photocell and said infrared cell and controlling said rst and second driving means.
  • a device as claimed in claim 7, further comprising a first measuring combination of position measuring means with an odometric device disposed in the path of movement of said ⁇ bloom in said rst roller bed, a second measuring ⁇ combination of position measuring means with an odometric device disposed in the path of movement of said mandrel in said second roller bed, computer means operatively connected to said rst and second measuring combinations, and said computer means controlling said first and second drive means to determine the points at which the predetermined changes in the movements of said mandrel and of said bloom are to be initiated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US855168A 1968-09-06 1969-09-04 Method and means for introducing a mandrel into a tubular bloom Expired - Lifetime US3625044A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681777104 DE1777104A1 (de) 1968-09-06 1968-09-06 Verfahren und Vorrichtung zum Einfuehren einer Dornstange in eine Rohrluppe

Publications (1)

Publication Number Publication Date
US3625044A true US3625044A (en) 1971-12-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
US855168A Expired - Lifetime US3625044A (en) 1968-09-06 1969-09-04 Method and means for introducing a mandrel into a tubular bloom

Country Status (5)

Country Link
US (1) US3625044A (fr)
AT (1) AT304415B (fr)
DE (1) DE1777104A1 (fr)
FR (1) FR2017474A1 (fr)
GB (1) GB1248834A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2527485A1 (fr) * 1982-05-28 1983-12-02 Innocenti Santeustacchio Spa Dispositif d'appui pour la barre porte-pointe de percage d'un laminoir perceur a pression

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2341342C2 (ru) * 2006-09-20 2008-12-20 Открытое акционерное общество "Электростальский завод тяжелого машиностроения" Способ установки стержня с короткой оправкой стана поперечно-винтовой прокатки
RU2559073C1 (ru) * 2014-02-21 2015-08-10 Открытое акционерное общество "Электростальский завод тяжелого машиностроения" Устройство для установки стержня с оправкой на трубопрокатном стане

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2527485A1 (fr) * 1982-05-28 1983-12-02 Innocenti Santeustacchio Spa Dispositif d'appui pour la barre porte-pointe de percage d'un laminoir perceur a pression
US4503698A (en) * 1982-05-28 1985-03-12 Innse Innocente Santeustacchio S.P.A. Apparatus for supporting the piercing mandrel back-up bar of a press-piercing rolling mill

Also Published As

Publication number Publication date
DE1777104A1 (de) 1971-04-01
AT304415B (de) 1973-01-10
GB1248834A (en) 1971-10-06
FR2017474A1 (fr) 1970-05-22

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