US3857267A - Process and installation for producing metal tubes without welding - Google Patents

Process and installation for producing metal tubes without welding Download PDF

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Publication number
US3857267A
US3857267A US00394603A US39460373A US3857267A US 3857267 A US3857267 A US 3857267A US 00394603 A US00394603 A US 00394603A US 39460373 A US39460373 A US 39460373A US 3857267 A US3857267 A US 3857267A
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US
United States
Prior art keywords
mandrel
blank
mill
boring
rolling
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
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US00394603A
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English (en)
Inventor
J Lemaire
P Malicet
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.)
Vallourec Usines a Tubes de Lorraine Escaut SA
Original Assignee
Vallourec Usines a Tubes de Lorraine Escaut SA
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.)
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Publication date
Application filed by Vallourec Usines a Tubes de Lorraine Escaut SA filed Critical Vallourec Usines a Tubes de Lorraine Escaut SA
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Publication of US3857267A publication Critical patent/US3857267A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
    • B21B17/04—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process

Definitions

  • the mandrel is released in such a way that the mandrel, engaged partly in the rolled blank, stops its travel through the mill.
  • the mandrel is removed from the rolled blank which is subjected to the furtherprocessing stages whilst the mandrel is cooled and is then inspected, lubricated and made ready for boring another solid bar.
  • Non-welded metal tubes are normally manufactured by a process initially comprising two successive operations, namely boring out a solid bar coming from a heating furnace to obtain a thick, hollow blank, and subsequently rolling this blank in a mill whose successive stands are staggered by 90 and which reduces the thickness of the hollow blank in such a way that the total reduction obtained by the time the end of the mill is reached corresponds to the required tube thickness.
  • the boring operation is generally carried out in an oblique mill, i.e., a mill whose rolls are frustoconical and which pushes the blank onto a boring head carried by a rod held in position throughout the entire operation. In this way, the thick, hollow blank is as it were threaded onto the boring rod.
  • an oblique mill i.e., a mill whose rolls are frustoconical and which pushes the blank onto a boring head carried by a rod held in position throughout the entire operation. In this way, the thick, hollow blank is as it were threaded onto the boring rod.
  • the blank After the boring rod has been separated from the blank, the blank is positioned on an expansion bench at the input end of a continuous mill.
  • a long mandrel is introduced into the hollow blank and a pusher engages the blank threaded onto its mandrel in the continuous mill.
  • the metal rolled between the rolls and the mandrel is elongated.
  • the mandrel is free and assumes an average speed resulting from the speeds of the metal at each stand of the continuous mill.
  • the combination of the mandrel and rolled blank partly covering the mandrel is collected at the output end of the mill on a mandrel-release bench where the mandrel is removed.
  • the rolled blank continues its travel towards the further-processing stages such as, for example, heating and calibration, whilst the long mandrel is carried towards a mandrel cooler and a lubricating system to be returned to the beginning of the expansion bench.
  • the lengths of the rolled blanks of limited thickness are confined to around 25 metres for a diameter of 100 mm, and to around 30 metres for a blank diameter of approximately 140 mm. This limit is imposed by the collapse of the finished blank during mandrel release.
  • the lengths to which the mandrel penetrates into the rolled blank and, hence, the mandrel-release lengths are very considerable, being of the order of 2l metres for a 25 metre rolled blank, and of the order of 26 metres for a 30 metre rolled blank. These are considerable lengths which, through the appreciable effort which they necessitate for mandrel release, promote collapse of the thin rolled blanks.
  • the second method also comprises introducing a mandrel into the bored-out blank at the input end of a continuous mill. Although the blank/mandrel combination is pushed inside the mill, the mandrel is fixed and only travels a short distance which is generally less than the distance separating the antepenultimate stand from the last stand.
  • the rolled blank issues from the last stand of the mill and releases the mandrel.
  • the mandrel is then taken back from the last cage to the beginning of the mill which it releases to enable the following blank to be brought into position.
  • the invention relates to a new process by which it is possible in particular, in the manufacture of metal tubes in the absence of welding, to obviate the disadvantages of the prior art referred to earlier on both in regard to output and in regard to the mandrel-release operations with the resulting limits on the length of the manufactured products and the properties of the product capable of being affected by this operation.
  • a solid bar is bored out on a mandrel, after which the combination of this mandrel with the hollow blank left after boring is introduced into a continuous rnill, the mandrel is retained during the rolling operation by imposing on it a speed calculated in such a way that its available length is at least equal to that which is strictly necessary for the rolling operation in question, the mandrel is released when rolling of the blank is finished in such a way that the mandrel partly engaged in the rolled blank stops its travel through the mill, the mandrel is removed from the rolled blank, the finished blank is subjected to the usual further-processing stages whilst the mandrel is cooled, checked, lubricated and returned to the head of the installation for boring out another solid bar.
  • a blank is associated with a mandrel which acts both as a boring rod during the first stage of manufacture and as a supporting mandrel for the rolling operation in the second stage.
  • a mandrel which acts both as a boring rod during the first stage of manufacture and as a supporting mandrel for the rolling operation in the second stage.
  • a boring head which can either remain attached to the mandrel throughout the entire cycle or can be disconnected from it at a stage in the cycle selected for its convenience and can follow its own cooling and checking cycle and can be reconnected to its mandrel or to another mandrel at any stage in the mandrel cycle.
  • the invention also relates to an installation for carrying out this process.
  • the installation according to the invention comprises a boring roll stand, a supporting stop designed to recoil and advance in the direction of the stand and to receive a mandrel equipped with a boring head; guide means arranged between the stand and the stop to support the mandrel and to prevent it from collapsing, and guide means for the tubular blank and means for ejecting the combination of the mandrel with the hollow blank when the mandrel is released from its supporting stop; a trough for axially positioning the hollow blank relative to the mandrel; a continuous mill with successive angularly staggered stands comprising, on its input duct, a system for arresting the rear of the mandrel with means regulating this arresting system during rolling to a predetermined speed and releasing the mandrel on completion of this operation; an output trough for the mill equipped with means for ejecting the rolled blank towards a mandrel-release bench; a mandrel release equipped with means for removing the rolled blank and a means
  • the arrangements for collecting the mandrels and returning them to the beginnning of the installation can comprise a tank for cooling the mandrels, a mandrelinspection platform, a lubricatingstage, a duct for realigning the mandrels in front of the boring stand and means for delivering the mandrels to the boring stand.
  • the boring stand is with advantage that an oblique mill, although it should be noted that the invention can even be applied in cases where boring of the blank is carried out differently.
  • the advantages afforded by the invention are numerous. They relate both to the continuous rolling technique and to the boring technique, to productivity or investment and to the costs of running the installation.
  • the mandrel both as a boring rod and as a rolling mandrel, to reduce the clearance between the mandrel and the hollow blank which facilitates engagement of the blank in the first stand of the continuous mill by enabling the peripheral reduction to be applied to the blank to be reduced and by reducing the-lateral bead which is formed between the rollers of the first stands of the continuous mill.
  • the mandrel has a fixed speed rather than a speed which fluctuates during rolling so that the metaldeformation conditions in the channels are not modified through variations in the speed of the mandrel, the deformation due to this phenomenon of speed variation of the metal is eliminated in every case, it is possible to roll with stands having a more closed channel system which provides for greater uniformity of thickness in any one section, and mandrel-release is made easier through the absence of deformation and through the possibility of obtaining a more round blank by virtue of the closed channel system. Since the extent to which the mandrel penetrates into the blank is considerably lower than in free-mandrel rolling, the mandrelrelease time is shorter and it is possible to release the mandrels under optimum conditions.
  • the process and installation according to the invention enable a high-speed borer to be used because the mandrels are immediately removed with the hollow blanks which they support. This facilitatesthe problem of cooling the boring heads which accompany the mandrels at least over part of their cycle and have all the time required for cooling.
  • the process and installation according to the invention enable the intervals between successive borings to be reduced by half without imposing any limit upon the rolling rate as in the case in conventional installations due to the prepositioning of the mandrel and the expanding operation.
  • this mandrel-release operation which is a delicate operation with thin blanks in conventional processes, does not slow down the production rate in any way.
  • FIG. 1 of the accompanying drawing diagrammatically illustrates one embodiment of the installation according to the invention
  • FIG. 2 is a graph comparing the relative displacements of the mandrel and the blank as a function of time in conventional continuous-rolling processes and the process according to the invention.
  • the reference I denotes a heating furnace, such as a rotary hearth furnace, from which are removed solid bars e which, through a centring means 2, are carried to aconventional means 3 for presenting solid blanks to a boring assembly 4, such as an oblique mill, whose rolls are driven by motors 5 through elongated shafts 6.
  • a supporting stop 7 which is designed to recoil and advance in the direction of the stand and to receive a mandrel M equipped with a boring head.
  • Diagrammatically illustrated at 8 between the stand 4 and the stop 7 are the conventional mandrel-guide means which keep the mandrel centred and prevent it from collapsing, and theconventional guide means for the tubular blank e.
  • the combination of the mandrel M with the blank e can be ejected after the mandrel has been released from its supporting stop 7.
  • the longitudinal position of the blank e' in relation to the mandrel M is regulated in a trough l0 equipped with a feeder and an ejector.
  • the input trough ll of a continuous mill 12 with successive stands staggered angularly by is arranged adjacent and parallel to the positioning trough 10.
  • a system 13 is designed to arrest the rear end of the mandrel, this system being regulated during rolling to a predetermined speed by any mechanical, hydraulic or electrical means, and to release the mandrel on completion of the rolling operation.
  • the output trough 13' of the continuous mill is equipped with an ejecting means 14 which delivers the combination of the mandrel M with the rolled blank E in which it is partly engaged towards a mandrel-release bench 15.
  • This bench which comprises a mandrelrelease means, for example with a mobile die, removes the blank E towards a platform 16 and the mandrel M towards a cooling tank 17.
  • the rolled blanks, whose ends are cut by saws 18, are then delivered to a conventional heating furnace 19 where they are prepared for finishing.
  • the mandrels cooled in the tank 17 then pass onto an inspection platform 20 and are subsequently lubricated at 21 before arriving in a duct 22 in which they are realigned for the roll cage 4.
  • mandrels M follow a cycle in the form of a single loop which passes through the boring means, the continuous rolling means and the mandrel-release means.
  • the end of the mandrel which carries the boring head is opposite to that which is introduced into the continuous rolling stage.
  • an inverse arrangement i.e. an arrangement in which the end which carries or has carried the boring head is that which is introduced into the continuous rolling stage.
  • the reference 23 denotes a means for separating the boring head from the mandrel, although the boring head could remain attached to the mandrel throughout the entire cycle or could be disconnected from the mandrel at any other suitable stage of the cycle followed by the mandrels.
  • FIG. 2 shows three graphs illustrating the movement of the blank as a function of time in solid lines and the movement of the mandrel as a function of time in broken lines, graph A relating to the free-mandrel rolling process, graph B to the fixed-mandrel rolling process and graph C to the next rolling process according to the invention.
  • process A begins with a mandrel M of considerable length which, after rolling, is engaged throughout almost the entire length of the rolled blank E,.
  • process B the mandrel M is fixed and, during rolling, only travels a short distance equal at most to the distance separating the antepenultimate stand (denoted by the reference VI in the example in question) from the last stand (VIII) of the continuous mill.
  • the mandrel makes a return movement designed to enable it to engage in another hollow blank.
  • a process for producing metal tubes without welding comprising the steps of:
  • An installation for producing metal tubes without welding comprising a boring roller stand, a supporting stop designed to recoil and advance in the direction of the stand and to receive a mandrel equipped with a boring head; guide means arranged between the stand and the stop for supporting the mandrel and preventing it from collapsing, and guide means for the tubular blank and means for ejecting the combination of the mandrel with the hollow blank after the mandrel has been released from its supporting stop; a trough for axially positioning the hollow blank in relation to the mandrel; a continuous mill with successive angularly staggered stands comprising, on its input duct, a system for arresting the rear end of the mandrel with means regulating this arresting system during rolling to a predetermined speed and releasing the mandrel on completion of this operation such that only a small fraction of the rolled blank has the mandrel within it; a mill output trough equipped with a means for ejecting the rolled blank towards a mand
  • a process for rolling a hollow metal blank containwithin it, g l, c mprising the steps of: c. releasing the mandrel after rolling of the blank has a. introducing the combined blank and mandrel mto been completed so that the mandrerdiseeminues a continuous mill,

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Metal Extraction Processes (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
US00394603A 1972-09-08 1973-09-05 Process and installation for producing metal tubes without welding Expired - Lifetime US3857267A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7231888A FR2198797B1 (fr) 1972-09-08 1972-09-08

Publications (1)

Publication Number Publication Date
US3857267A true US3857267A (en) 1974-12-31

Family

ID=9104021

Family Applications (1)

Application Number Title Priority Date Filing Date
US00394603A Expired - Lifetime US3857267A (en) 1972-09-08 1973-09-05 Process and installation for producing metal tubes without welding

Country Status (9)

Country Link
US (1) US3857267A (fr)
JP (2) JPS5614042B2 (fr)
BE (1) BE803668A (fr)
CA (1) CA991892A (fr)
DE (1) DE2345056A1 (fr)
ES (1) ES418268A1 (fr)
FR (1) FR2198797B1 (fr)
GB (1) GB1449662A (fr)
IT (1) IT997237B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4289011A (en) * 1978-11-17 1981-09-15 Nippon Steel Corporation Continuous pipe rolling process
US4353238A (en) * 1981-05-18 1982-10-12 Vallourec, Societe Anonyme Method for manufacture of seamless metal tubing by continuous rolling
US4361023A (en) * 1980-06-06 1982-11-30 Claude Blanquet Mandrel-restraining assembly for a tube-rolling mill
US4375160A (en) * 1979-11-21 1983-03-01 Vallourec Manufacture of seamless steel tube
US4571970A (en) * 1981-09-14 1986-02-25 Kocks Technik Gmbh & Co. Rolling mill plant for the manufacture of seamless tubes
US20140023790A1 (en) * 2011-03-03 2014-01-23 Mattssonforetagan I Uddevalla Ab Method and device for dosing and coating

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2605486C2 (de) * 1976-02-12 1982-11-11 Kocks Technik Gmbh & Co, 4010 Hilden Verfahren zum Herstellen längsnahtgeschweißter Rohre
GB1575859A (en) * 1977-04-18 1980-10-01 Aetna Standard Eng Co Process for the production of seamless tubular products
IT1115288B (it) * 1977-05-05 1986-02-03 Innocenti Santeustacchio Spa Dispositivo per mandrino in laminatoi continui a mandrino trattenuto
DE2750637A1 (de) * 1977-11-09 1979-05-10 Mannesmann Ag Verfahren zum herstellen nahtloser rohre
DE2811801A1 (de) * 1978-03-15 1979-09-20 Mannesmann Ag Verfahren und anlage zum warmwalzen nahtloser rohre
JPS5913283B2 (ja) * 1978-11-17 1984-03-28 新日本製鐵株式会社 管の連続圧延法
FR2443884A1 (fr) * 1978-12-15 1980-07-11 Vallourec Fabrication de tubes sans soudure de forts diametres
IT1110926B (it) * 1979-02-07 1986-01-13 Innocenti Santeustacchio Spa Metodo ed apparecchiatura per il controllo del movimento del mandrino in un laminatoio continuo a mandrino trattenuto
JPS5717305A (en) * 1980-07-07 1982-01-29 Hitachi Ltd Continuous rolling installation for seamless pipe
JPS5732805A (en) * 1980-08-05 1982-02-22 Ishikawajima Harima Heavy Ind Co Ltd Rolling plant for pipe making
JPS58119408A (ja) * 1982-01-05 1983-07-15 Kawasaki Steel Corp 継目無鋼管の延伸圧延方法
JP2528798Y2 (ja) * 1990-10-09 1997-03-12 松下電工株式会社 雨樋部品
RU2017106031A (ru) * 2014-07-31 2018-08-28 Смс Иннсе С.П.А. Компактная установка для прокатки бесшовных труб

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2024514A (en) * 1933-03-25 1935-12-17 Diescher Tube Mills Inc Method and apparatus for making tubes
US2063689A (en) * 1933-07-03 1936-12-08 Jones & Laughlin Steel Corp Manufacture of tubes
US2356734A (en) * 1941-08-14 1944-08-29 Nat Tube Co Tube mill
US3722246A (en) * 1970-04-10 1973-03-27 Innocenti Soc Generale Hot perforating mill

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE225679C (fr) * 1909-04-28
DE1752116A1 (de) * 1968-04-05 1971-05-13 Mannesmann Ag Verfahren und Vorrichtung zum Herstellen nahtloser Stahlrohre

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2024514A (en) * 1933-03-25 1935-12-17 Diescher Tube Mills Inc Method and apparatus for making tubes
US2063689A (en) * 1933-07-03 1936-12-08 Jones & Laughlin Steel Corp Manufacture of tubes
US2356734A (en) * 1941-08-14 1944-08-29 Nat Tube Co Tube mill
US3722246A (en) * 1970-04-10 1973-03-27 Innocenti Soc Generale Hot perforating mill

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4289011A (en) * 1978-11-17 1981-09-15 Nippon Steel Corporation Continuous pipe rolling process
US4375160A (en) * 1979-11-21 1983-03-01 Vallourec Manufacture of seamless steel tube
US4361023A (en) * 1980-06-06 1982-11-30 Claude Blanquet Mandrel-restraining assembly for a tube-rolling mill
US4353238A (en) * 1981-05-18 1982-10-12 Vallourec, Societe Anonyme Method for manufacture of seamless metal tubing by continuous rolling
US4571970A (en) * 1981-09-14 1986-02-25 Kocks Technik Gmbh & Co. Rolling mill plant for the manufacture of seamless tubes
US20140023790A1 (en) * 2011-03-03 2014-01-23 Mattssonforetagan I Uddevalla Ab Method and device for dosing and coating
US9409205B2 (en) * 2011-03-03 2016-08-09 Mattssonforetagen I Uddevalla Ab Method and device for dosing and coating

Also Published As

Publication number Publication date
ES418268A1 (es) 1976-06-01
GB1449662A (en) 1976-09-15
FR2198797A1 (fr) 1974-04-05
FR2198797B1 (fr) 1975-01-03
JPS4991949A (fr) 1974-09-03
DE2345056A1 (de) 1974-03-21
BE803668A (fr) 1973-12-17
JPS6235844B2 (fr) 1987-08-04
JPS5614042B2 (fr) 1981-04-02
JPS5865503A (ja) 1983-04-19
IT997237B (it) 1975-12-30
CA991892A (en) 1976-06-29

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