US3921430A - Apparatus for rolling seamless tubes - Google Patents

Apparatus for rolling seamless tubes Download PDF

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Publication number
US3921430A
US3921430A US523178A US52317874A US3921430A US 3921430 A US3921430 A US 3921430A US 523178 A US523178 A US 523178A US 52317874 A US52317874 A US 52317874A US 3921430 A US3921430 A US 3921430A
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United States
Prior art keywords
mandrel
rolling
tanks
cooling
tubular
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
US523178A
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English (en)
Inventor
Jean Paul Calmes
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.)
SMS Group SpA
Original Assignee
Innocenti Santeustacchio SpA
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 IT1949673A external-priority patent/IT981009B/it
Priority to GB302074A priority Critical patent/GB1433452A/en
Priority to FR7402123A priority patent/FR2214531B1/fr
Priority to DE2403216A priority patent/DE2403216A1/de
Application filed by Innocenti Santeustacchio SpA filed Critical Innocenti Santeustacchio SpA
Priority to US523178A priority patent/US3921430A/en
Application granted granted Critical
Publication of US3921430A publication Critical patent/US3921430A/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
    • B21B25/04—Cooling or lubricating mandrels during operation

Definitions

  • the process is an improvement over the known process in which a tube is rolled on a mandrel which is restrained at its head end, and after the rolled tube is discharged the mandrel is moved laterally to a cooling position and a second mandrel used for a subsequent rolling operation, the two mandrels alternating between a cooling position and an operating position.
  • the improvement comprises using a single mandrel and cooling this whilst it remains on the rolling axis.
  • the mandrel never leaves the rolling axis, being moved backwards and forwards along this during rolling and cooling stages of the process.
  • the apparatus includes tubular tanks between adjacent roll stands of the rolling mill through which the rolled tube and mandrel pass and in which the cooling is effected by a flow of coolant therethrough.
  • the present invention relatesto a process for rolling seamless tubesyof the type in which an inget or bloom to be formed into a tube is passed. through a train of rolls on a mandrel which is restrained at its upstream end, following which the mandrel is cooled before being re-used.
  • This invention also relates to apparatus for carrying the processinto effect, comprising a train of rolls and an arrangement, upstream of the train of rolls, for controlling the movement of mandrel inserted in a hollow ingot or bloom to be rolled.
  • the mandrel of known types of such apparatus is lubricated duringrolling by injection of a lubricant between the inner surface ofthe bloom and the outer surface of the mandrel through a conduit inside the mandrel itself; there is also a conduit within the mandrel through which a continuous flow of cold water under pressure is maintained during rolling for cooling purposes (see for example French Pat. No. 1458432).
  • a longitudinal transport device After rolling the tube and extraction of the mandrel. the latter, fixed to a longitudinal transport device is drawn out of the rolling mill to be returned to the starting position to commence another cycle.
  • it In order completely to cool the mandrel, it is thrust laterally of the rolling axis to an.outer cooling position beneath spray jets, whilst a second mandrel which was in the cooling position under the jets during the working cycle of the.
  • firstmentioned mandrel is automatically moved to the starting position as a result of displacement of the first mentioned mandrel to the cooling position.
  • the object of the present invention is to reduce substantially the disadvantages of known processes mentioned above by providing a rolling process of rational,-
  • a process for rolling seamless tubes comprising a rolling stage in which the ingot or bloom to be rolled into a tube is passed through a roll train on a mandrel restrained at its head end by a restraining device. and a cooling stage, characterised in that after dis-.
  • the mandrel is moved longitudinally and maintained on the rolling axis whilst being cooled and is then moved longitudinally along said rolling axis into position for the commencement of a subsequent operative cycle.
  • apparatus for carrying out the process defined above comprises a roll train and a restraining device upstream of the roll train operable to restrain and to move in a controlled manner the mandrel. when attached thereto. characterised in that it includes tubular tanks located on the rolling axis between adjacent stands of the roll train and connected to conduits for admission and discharge of a coolant liquid. there being provided valves to control the admission of coolant liquid into the tubular tanks during the cooling stage of the process and to effect discharge ofthe coolant liquid from the tanks immediately before the rolling stage of the process.
  • FIG. 1 is a diagrammatic longitudinal section of a rolling mill equipped to carry out the process of thisinvention
  • FIG. 2 is an axial section on an enlarged scale illustrating a detail of the embodiment of FIG. 1;
  • FIGS. Sand 4 are cross sections taken on the line III- III of FIG. 1, illustrating the apparatus during and after the passage of an ingot.
  • the rolling'mill A which is of continuous type having a plurality of roll stands.
  • the embodiment illustrated in FIG. 1 is a five-stand rolling mill each stand of which comprises a pair of rolls a.
  • the rolls a have been shown all with parallel axes. but in practice the axes of the rolls of the second and fourth stand would be perpendicular to the axes of the rolls of the other stands.
  • a hollow mandrel 2 is inserted at high speed ino the bloom from the downstream end thereof. being moved in the direction opposite the direction of rolling by means of high-speed movement cylinders 4 which are located at the input end of the rolling mill A and which are movable into and out of an engagement position by means of respective hydraulic cylinders 4a.
  • the head 3 ofthe mandrel is automatically coupled to a restraining crosspiece 5 and at the same time (and also automatically) couplings are made to cooling water conduits 6 which extend through the mandrel 2, for cooling the inside thereof.
  • Movement of the crosspiece 5 during rolling is controlled by hydraulic cylinders 9 which are themselves controlled to move at constant speed by means of a constant-discharge pump (not shown).
  • the crosspiece 5 is-thus movable during a rolling operation to the position shown in broken outline in FIG. 1.
  • tubular tanks 12 through which the tube 1 being rolled and the mandrel 2 can pass-during the rolling operation;
  • each tubular tank 12 has a dis charge opening 13 and the upper part of each tank has an aperture 13a (FIG. 2). Also. for each tank 12, there is provided a vertically movable saddle support 11 which can be moved between a raised position in "which it is inserted into the discharge opening 13, so as to close it, and a lowered position in which the opening 13 is unobstructed. In the raised position each support 11 projects a certain distance into the respective tubular tank 12.
  • Each saddle support 11 has a surrounding collar lla engageable with a cooperating annular abutment 13b, provided around the opening 13, when the support 11 is raised.
  • the supports 11 serve. in the raised position, for supporting the mandrel 2 after a rolling operation. and are raised and lowered by means of respective hydraulic cylinders 11b (FIG. I).
  • the tubular tanks 12 also have conduits 14 communicating with the underside thereof. through which cooling water can be introduced into and withdrawn from the tanks.
  • Each conduit 14 has a three-way valve 14a by means of which the conduit 14 can be connected to a main supply conduit 14b or with a discharge conduit 140 depending on the position of the valve 14a.
  • FIG. 1 Downstream of the rolling mill A there are placed two further tubular tanks 1211 which are the same as tanks 12; these are also supplied with cold water by conduits 14 from the main supply conduit 14b, and n have movable supports 11 (FIG. 1).
  • the continuous arrows B (FIG. 2) indicate the flow of water when the valves 140 are moved to a position allowing admission of water to the tanks 12. 12a. whilst the dashed arrows C indicate the outgoing flow when the valves [40 are moved to the discharge position.
  • a rotary movement device 8 comprising a pair of inclined rolls operative to move the mandrel 2 longitudinally and at the same time to cause it to rotate around its longitudinal axis.
  • the rolling cycle at the start of the rolling cycle. into the bloom l, by moving it upstream on the rolling axis until the head 3 engages the crosspiece 5. to which it couples up automatically (the movement of the mandrel upstream of the rolling mill is effected by high-speed displacement rollers 4). After this the rolling can be started by insertion of the bloom 1 (together with the mandrel 2) into the rolling mill A. movement being effected by the crosspiece 5.
  • FIG. 3 which shows the supports 11 in the lowered position, the tubular tanks 12 empty and the mandrel 2 and tube 1 passing therethrough, to the position shown in FIG. 4 in which the supports 11 are raised until the collar 11a encounters the annular abutment 13b so as to support the mandrel 2 after the rolled tube 1 has been drawn therefrom by the action of the roll train A, and the tubular tanks 12 are refilled with cooling water flowing continuously from the conduits 14 into the tanks 12 and overflowing from the tops of the tanks 12 through the apertures 13a.
  • the tube 1 is removed from the rolling mill A by the calibrator-extractor rolling mill 10.
  • the mandrel 2 After the rolled tube 1 has been discharged the mandrel 2 is uncoupled from the crosspiece 5 and thus also from the cooling water conduits 6 and the lubricant conduits 7. Whilst the cross piece 5 is quickly returned to its initial position by means of the hydraulic cylinders 9, the mandrel 2 is moved axially first forwards. that is in the same direction as it travels during rolling. and then backwards by means of the movement device 8 which, as mentioned above, causes the mandrel both to move axially and to rotate around its axis. With these movements the mandrel 2 is effectively cooled over its external surface in the tubular tanks 12 and 12a which. in this stage of the process, as stated, are full of running water.
  • the movement device 8 operates to drive the mandrel in the reverse direction of movement through the next bloom to be rolled which has been placed in position before the head 3 of the mandrel 2 passes out of the roll train A in its reverse movementv The head 3 of the mandrel is thus re-engaged with the crosspiece 5 ready for the commencement of the next rolling operation.
  • the mandrel 2 is thus re-utilized for each rolling operation; it is maintained constantly on the rolling axis of the rolling mill, and inserted from downstream to upstream in each bloom l to be subjected subsequently to rolling.
  • the supports 11 will be lowered automatically after the mandrel has passed, so as to open the discharges 13; the conduits 14 are at the same time placed in communication with the discharge conduit.
  • the tanks 12 and 12a will thus empty so to be ready to receive the mandrel 2 and the tube 1 in the subsequent rolling operation.
  • a worn or damaged manrel it may be withdrawn from the diischarge end of the mill A in a similar manner to that of a rolled tube, or alternatively may be removed from the entry end of the mill A so that it can be replaced by a new mandrel.
  • the helical movement device 8 may be constituted by any means suitable for causing axial advance of a cylindrical body with simultaneous axial rotation.
  • time lost in changing mandrcls. is substantially eliminated so that the rate of production may remain substantially constant at all times.
  • Apparatus for rolling seamless tubes comprising:
  • a roll train having a plurality of roll stands defining a rolling axis
  • a plurality of tubular tanks located between adjacent said roll stands on the rolling axis of said roll train and positioned so that a tube being rolled and said mandrel can pass therethrough during rolling.
  • each said tubular tank having a discharge opening in the lowermost side thereof, and a vertically movable support positioned beneath each said discharge opening.
  • means for running each said support between a raised position where said support closes said discharge opening and projects into said tank to provide support for said mandrel during cooling and a lowered position where said discharge opening is unobstructed whereby any water in said tanks is discharged therefrom.
  • each said tubular tank has an upper aperture through which coolant can overflow when said tanks are filled with coolant liquid.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
US523178A 1973-01-23 1974-11-12 Apparatus for rolling seamless tubes Expired - Lifetime US3921430A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB302074A GB1433452A (en) 1973-01-23 1974-01-22 Rolling of seamless tubes
FR7402123A FR2214531B1 (enrdf_load_stackoverflow) 1973-01-23 1974-01-22
DE2403216A DE2403216A1 (de) 1973-01-23 1974-01-23 Verfahren zum walzen nahtloser rohre und anlage zur durchfuehrung dieses verfahrens
US523178A US3921430A (en) 1973-01-23 1974-11-12 Apparatus for rolling seamless tubes

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT1949673A IT981009B (it) 1973-01-23 1973-01-23 Procedimento per laminare tubi senza saldatura e apparecchiatu ra per l attuazione del medesimo procedimento
US43504674A 1974-01-21 1974-01-21
US523178A US3921430A (en) 1973-01-23 1974-11-12 Apparatus for rolling seamless tubes

Publications (1)

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US3921430A true US3921430A (en) 1975-11-25

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US523178A Expired - Lifetime US3921430A (en) 1973-01-23 1974-11-12 Apparatus for rolling seamless tubes

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US (1) US3921430A (enrdf_load_stackoverflow)
DE (1) DE2403216A1 (enrdf_load_stackoverflow)
FR (1) FR2214531B1 (enrdf_load_stackoverflow)
GB (1) GB1433452A (enrdf_load_stackoverflow)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1931912A (en) * 1930-04-08 1933-10-24 Aluminum Co Of America Method of forming aluminum
US2245656A (en) * 1939-09-27 1941-06-17 Youngstown Sheet And Tube Co Water-cooled guide shoe for piercing mills
US3392565A (en) * 1965-02-15 1968-07-16 Blaw Knox Co Manufacture of seamless tubing
US3394568A (en) * 1964-09-09 1968-07-30 Contubind Sa Apparatus for rolling seamless tubes
US3782160A (en) * 1970-11-05 1974-01-01 G Kheifets Pipe quenching unit
US3805568A (en) * 1971-11-17 1974-04-23 I Properzi Device for conveying the cooling and lubricating fluid in multi-stand rolling mills for the production of metal bars and wire

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1931912A (en) * 1930-04-08 1933-10-24 Aluminum Co Of America Method of forming aluminum
US2245656A (en) * 1939-09-27 1941-06-17 Youngstown Sheet And Tube Co Water-cooled guide shoe for piercing mills
US3394568A (en) * 1964-09-09 1968-07-30 Contubind Sa Apparatus for rolling seamless tubes
US3577754A (en) * 1964-09-09 1971-05-04 Albert H Calmes Process and apparatus for rolling seamless tubes
US3392565A (en) * 1965-02-15 1968-07-16 Blaw Knox Co Manufacture of seamless tubing
US3782160A (en) * 1970-11-05 1974-01-01 G Kheifets Pipe quenching unit
US3805568A (en) * 1971-11-17 1974-04-23 I Properzi Device for conveying the cooling and lubricating fluid in multi-stand rolling mills for the production of metal bars and wire

Also Published As

Publication number Publication date
GB1433452A (en) 1976-04-28
FR2214531B1 (enrdf_load_stackoverflow) 1976-10-08
FR2214531A1 (enrdf_load_stackoverflow) 1974-08-19
DE2403216A1 (de) 1974-08-01

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