US3503238A - Manufacture of tubes - Google Patents

Manufacture of tubes Download PDF

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Publication number
US3503238A
US3503238A US634943A US3503238DA US3503238A US 3503238 A US3503238 A US 3503238A US 634943 A US634943 A US 634943A US 3503238D A US3503238D A US 3503238DA US 3503238 A US3503238 A US 3503238A
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United States
Prior art keywords
tube
rollers
billet
head
throat
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Expired - Lifetime
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US634943A
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English (en)
Inventor
Jacob Marcovitch
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ROTARY PROFILE ANSTALT
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ROTARY PROFILE ANSTALT
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • B21K1/761—Making machine elements elements not mentioned in one of the preceding groups rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • 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
    • B21B19/12—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 parallel to the axis of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
    • B21C1/24—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles by means of mandrels
    • B21C1/26—Push-bench drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, 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
    • B21C3/02—Dies; Selection of material therefor; Cleaning thereof
    • B21C3/08—Dies; Selection of material therefor; Cleaning thereof with section defined by rollers, balls, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H1/00—Making articles shaped as bodies of revolution
    • B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H1/00—Making articles shaped as bodies of revolution
    • B21H1/18—Making articles shaped as bodies of revolution cylinders, e.g. rolled transversely cross-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H8/00—Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects, e.g. checkered sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D25/00—Machines or arrangements for shearing stock while the latter is travelling otherwise than in the direction of the cut
    • B23D25/02—Flying shearing machines
    • B23D25/04—Flying shearing machines in which a cutting unit moves bodily with the work while cutting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y10T29/49991—Combined with rolling

Definitions

  • Tubular articles are made by drawing a billet through an annular throat one wall of which is defined by a series of skewed rollers the contour of each of which is such as to make line contact with the tube traversing the throat, and to draw material from the billet through the throat.
  • the billet may be annular, and it may be continuously made from molten metal replenished from a reservoir.
  • This invention relates to the manufacture of tubular articles by the method commonly known as rotary piercing in which a billet is offered to a piercing head which is rotated and advanced relatively to the billet to form the cavity of the article, while the formed tube is supported.
  • the billet being annular and drawn over the head to pass through an annular throat defined between the head and a series of skewed rollers disposed radially around the head.
  • the billet is nipped by the rollers which, by reason of their rotation and their oblique location relatively to the billet, cause the billet to be advanced through the throat continuously and pierced to form a tube.
  • the method has grave disadvantages.
  • One of them is that the head has to be maintained in position as the drawing of the tube proceeds.
  • the only way to mount the head is at the end of a stem over which the drawn tube passes, in its advance towards the supported end of the stem, and which fullfils the function of supporting the formed tube.
  • the stem Unless the finished tube is of short length, which is seldom the case, the stem has to be long, and it tends to whip in use, which causes the shape of the throat to vary and therefore affects the uniformity of the wall thickness of the tube.
  • the stem can be journalled in a series of removable bearings, but, as they must be successfully withdrawn to make way for the advancing tube, they add to the complication of the machine without being of much help.
  • tube made by the piercing method is sold with the maximum permissible variation in wall thickness given, and this can be as high as 33%. It follows that if uniformity of wall thickness is of moment to the user, the tube has to be processed, which adds to the cost and wastes material.
  • the object of the present invention is to provide a piercing technique which minimizes the difficulties and inconveniences of the standard techniques, and to make it possible to finish the product to its desired dimensions, configuration and finish in one combined operation, and to introduce new means to achieve this.
  • apparatus for manufacturing tubular articles consists of a cantilevered forming head, an annular throat which is located close to the attachment of the cantilevered head, and the inside of which is defined by the head, structure surrounding the head and defining the outside of the throat, and means to draw plastically deformable material from a billet through the throat.
  • the support for the head can be made massive, as the head diameter is not limited by the inner diameter of the drawn tube.
  • the support can itself be massively supported, as it extends rearwardly beyond the billet and can be cantilevered in a sturdy mounting.
  • the drawn tube not having the stem within it, can be of indefinite length, depending only upon the volume of material contained in the billet. Indeed, where the billet is formed in situ from constantly supplemented molten material, the length of the tube can theoretically be infinite.
  • the rollers always surround the advancing tube, and this limits the size of tube that can be drawn, because amongst other reasons, the power requirements of the piercing process become far too great for any but fairly small bore tubes.
  • the degree of deformation required to produre large diameter tubes can be mitigated by increasing the aperture size of the billet.
  • the tube diameter can, indeed, be so large as to permit the rollers to be located within the cavity of the advancing tube. There is then no restriction whatever as to the massiveness of the structure surrounding the head, but the support for rol ers in the head is circumscribed.
  • the technique of drawing a preformed billet over the piercing head is not possible, as this presupposes the annular billet open at both ends. Therefore, for the closedended articles, the billet is initially a solid slug which is pierced by the piercing head to form a blind hole, and the billet is then propelled through the throat by the head. In either case, however, the procedure of forming the billet in situ from a constantly replenished source of molten material is valid.
  • FIGURE 1 is a vertical section through a machine for making long lengths of tubing
  • FIGURE 2 is a vertical section of part of a machine for making lengths of tubing of fairly large bore
  • FIGURES 3, 4 and 5 are detail views showing suitable configurations of rollers, I
  • FIGURE 6 is a side view, partly in section, of a machine for making long lengths of tubing from metal that is initially molten
  • FIGURES 7 to 11 are fragmentary side views, all but 7 partly in section, illustrating the manufacture of a tubular article with one end closed, and, in FIGURE 11, with both ends closed,
  • FIGURE 12 is a fragmentary side view, partly in section, of a machine to make a tube with a closed end
  • FIGURE 13 is a fragmentary sectional view of apparatus to make a closed-ended article such as a flanged dome.
  • FIGURES 1 and 2 For the making of long lengths of tubing, two basic embodiments are shown in FIGURES 1 and 2, FIG- URE l for smalland FIGURE 2 for large-bore tubing.
  • the head 10 is the tip of a massive rod 12 journalled in a bearing block 14. The tip is reduced in diameter and joins the body of the rod in a smooth curve 16.
  • the head is surrounded by a series of skewed rollers 18 mounted in a cage 20 that is itself journalled within a massive bearing block 22.
  • the cage is rotated by a gear drive 24.
  • the rollers may be mounted on axles carried by the cage or may roll on a backing surface.
  • annular space surrounding the rod 12 and in which is located an annular billet 26.
  • the space may be enclosed by a sleeve shown in dotted lines at 28, which may be divided into segments which are movable radially inwardly to pummel the billet to maintain it in contact with the head.
  • Pushers 30 are provided to propel the billet towards the throat defined between the rollers and the head by pressure on a backing plate 31.
  • the billet is preformed with an annular lip 32 which is projected into the throat by the pushers to be nipped between the head and the rollers. Thereafter, the billet is drawn through the throat by the nip of the rollers and emerges as a tube 34. In the case of a convergent throat, such as that illustrated, the billet is preformed complementally to the rod 12.
  • the pushers may be used continuously as the tube is drawn, to assist the advance of the billet towards and through the throat.
  • the pushers may be used only as an initial feeder, and the rollers alone used to advance the formed tube, if the nature of the material and of the tube make this practicable.
  • the structure 36 surrounding the head is a circular collar.
  • a post 3 8 on which is rotatably mounted a cage 40 that houses a series of skewed rollers 42.
  • the cage is rotated by a gear 44 on a shaft 46.
  • the shank 47 of the post is surrounded by a collar 48.
  • This composite structure forms a head in which the rollers 42 are mounted.
  • the billet 50 again annular, is confined within a space defined between the head, the collar 36, and a backing plate 56 propelled by a series of pushers 58 to urge the billet into the throat defined between the rollers 42 in the head and the collar 36.
  • the advancing tube may be subjected to one or more operations after it leaves the throat.
  • the tube may be reduced in diameter and/or wall thickness by being passed through a throat defined between a core 60 which is an extension of the head and a second series of skewed rollers 62 mounted in a cage 64 journalled for rotation within a bearing block 66 and driven by gearing 68.
  • a water spray 70 may be provided to cool the tube.
  • a cutting device 72 may be provided to sever the tube.
  • the rollers 18 are mounted on fixed axes and are driven, so that the rollers impart a twisting motion to the tube during its formation. This causes fibrous impurities to be fragmented.
  • the contours of the skewed rollers be such that the roller meets the tube in a line contact, and, as that line contact is part of a helix, a component of force in the axial direction of the tube causes it to be propelled forwardly.
  • the deformation imposed on the billet as it is drawn through the throat resists the advancing force provided by the rollers and it may in many cases be necessary to supplement the force tending to advance the tube by shaping the rollers to bite into the tube.
  • the roller 74 is hyperbolic in contour, which produces line contact when the roller is in contact with a plain cylindrical tube. However, it may be necessary or de sirable to depart from a true hyperbola by the addition of an.
  • FIGURES 3 and 4 external rollers are shown.
  • an internal roller '84 is shown within a tube 86.
  • the contour of the roller is again hyperbolic, but this time convex outwards, and an enlargement 88 may be provided to bite into the tube.
  • a development of the invention provides for the continuous drawing of tube to a theoretically infinite length, by constantly supplementing the billet as its material is used.
  • the machine includes an enclosed annular space 90 (FIGURE 6) surrounding the head 92 and located between the collar 94 and the throat 96 and means to feed molten material 98 into the space, consisting of a reservoir 100 heated by electrical elements 102 and connected to the annular space 90 by a duct 104.
  • the metal in the space 90 solidifies to form the billet.
  • the billet is constantly supplemented by solidification of new material from the reservoir 100.
  • the billet and the tube have no rotational forces applied between them.
  • the forces at least theoretically, are entirely axial (for traction) and radial, (for deformation).
  • FIGURES 7 to 11 A cylindrical billet 108 (FIGURE 7) is preformed to the cavitied shape shown in FIGURE 8. It is then propelled by a head 110 through a throat defined by the head 110 itself and a series of radially arranged skew rollers 112.
  • the head 110 is the equivalent of the head of the previous embodiments, except that it is slidably mounted for axial movement in a guide 114 as can be seen in FIGURES 9 and 10.
  • This technique enables a cylinder to be made quickly and cheaply, with that uniform wall thickness which is of such importance for cylinders to contain liquids and gases under high pressure. This is due to the fact that the rollers 112 are close to the guide 114 and remain so always, so that the structure is rigid and the throat remains of uniform dimension.
  • the head 110 can be left in situ in the formed tube as a lining, if the head is hollow, or as a core if it is solid. It is, therefore, possible to make a tube, say of concrete or steel, initially present as the head, with a covering of, say, plastic or lead.
  • FIGURE 12 illustrates the techniqueof advancing a head through a solid billet 124 to produce a tube 126 with a bulbous trailing end 128, its leading edge advancing with the free end of an axially movable head 132 into a die 134 which supports the tube and head and may size the outer surface of the tube.
  • the throat is defined by skew rollers 136 surrounding the head and which cause the forming tube to advance.
  • the die 134 is, of course, advanced as the tube 126 advances.
  • FIGURE 13 a further development of the subject matter of FIGURES 7 to 11 is seen in FIGURE 13.
  • a billet (its initial shape illustrated in dotted lines at 138) is trapped between a cylindrical head 140 and a series of rollers 142 that are suitably profiled, and which roll upon a backing plate 144.
  • the billet must be sufliciently hot to be plastic, and it is deformed by the rolling to bell shape to the extent possible to the rollers.
  • the rollers are withdrawn and replaced by a series of V-shaped rollers 148 and the billet is advanced through them to roll out the lower part of the bulbous zone 138 left by the first set of rollers 142.
  • the second operation causes the bulbous zone 138 to flow into the interstices of the head and its backing plate 144. Provision is made to receive surplus metal, which enters an escape gap 152 and forms a flash 154 which is subsequently removed.
  • Apparatus for forming a tube from an apertured billet which apparatus comprises workpiece supporting means, constituted by a supporting surface, and feed and working means, one of the workpiece supporting means and the feed and working means being located within the other so as to define an annular working space through which the material of an apertured billet may be passed and being arranged so that the supporting surface supports the material over the entire peripheral surface where the other surface is subject to pressure from the feed and working means, the feed and working means comprising a plurality of enlarged skewed feed flanges at the inlet to the annular working space to force the material of the billet through the working space and a plurality of work rollers having a circular section working surfaces and being located downstream of the feed means in the throat.
  • roller carrier which is rotatable about the axis of the supporting surface and which rotatably carries the feed rollers.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Materials For Medical Uses (AREA)
  • Forging (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
US634943A 1966-05-05 1967-05-01 Manufacture of tubes Expired - Lifetime US3503238A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA662610 1966-05-05
ZA664911 1966-08-17

Publications (1)

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US3503238A true US3503238A (en) 1970-03-31

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US634943A Expired - Lifetime US3503238A (en) 1966-05-05 1967-05-01 Manufacture of tubes
US882367A Expired - Lifetime US3643485A (en) 1966-05-05 1969-12-15 High-pressure rolling of workpieces

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Application Number Title Priority Date Filing Date
US882367A Expired - Lifetime US3643485A (en) 1966-05-05 1969-12-15 High-pressure rolling of workpieces

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JP (1) JPS4817973B1 (es)
AT (1) AT289691B (es)
BE (2) BE697960A (es)
CH (1) CH515754A (es)
DE (2) DE1602332A1 (es)
ES (1) ES340126A1 (es)
FR (2) FR1554623A (es)
GB (2) GB1188374A (es)
NL (1) NL6706338A (es)
SE (2) SE328541B (es)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3695076A (en) * 1969-12-02 1972-10-03 Kocks Gmbh Friedrich Method for manufacture of seamless tube
US4512177A (en) * 1982-06-30 1985-04-23 Sumitomo Metal Industries, Ltd. Method of manufacturing metallic materials having a circular cross section
US4602493A (en) * 1982-11-25 1986-07-29 Akademia Gorniczo-Hutnicza Im. Stanislawa Staszica Rolling mill for reducing the thickness of the wall of a tube
US20060157539A1 (en) * 2005-01-19 2006-07-20 Dubois Jon D Hot reduced coil tubing
CN112934974A (zh) * 2021-01-29 2021-06-11 西北工业大学 一种金属筒形件外轧挤压成形装置及成形方法

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CH575786A5 (es) * 1972-04-12 1976-05-31 Bohner & Koehle
US4306437A (en) * 1979-12-10 1981-12-22 Grotnes Metalforming Systems, Inc. System for planishing metal pipe
DE3419766A1 (de) * 1984-05-26 1985-11-28 SMS Schloemann-Siemag AG, 4000 Düsseldorf Verfahren und vorrichtung zum walzen von metallband
DE3622678A1 (de) * 1985-07-12 1987-01-15 Kocks Technik Verfahren und vorrichtung zum querwalzen nahtloser rohrluppen
FR2608096B1 (fr) * 1986-12-15 1993-12-24 Solomat Sa Procede et installation d'extrusion d'un produit en forme de film, de plaque, de tube, de tige ou de fil
DE3702066A1 (de) * 1987-01-24 1988-08-04 Gao Jianmin Kaltwalzwerk fuer grosse rohre
US5306129A (en) * 1992-05-11 1994-04-26 Solomat Partners, L.P. Molding deformable materials with use of vibrating wall surfaces
US5494426A (en) * 1992-05-11 1996-02-27 Thermold Partners L.P. Vibrating wall surfaces for molding deformable materials
DE4313648C2 (de) * 1993-04-21 1997-10-09 Mannesmann Ag Verfahren und Vorrichtung zum Herstellen von nahtlosen Rohren durch Drückwalzen
EP0955110B1 (de) * 1998-05-07 2004-04-07 Leico GmbH & Co. Werkzeugmaschinenbau Verfahren zum Drückwalzen und Drückwalzvorrichtung
GB0216074D0 (en) * 2002-07-11 2002-08-21 Weatherford Lamb Improving collapse resistance of tubing
US8746028B2 (en) 2002-07-11 2014-06-10 Weatherford/Lamb, Inc. Tubing expansion
CA2461855C (en) * 2003-03-25 2008-05-20 Weatherford/Lamb, Inc. Vibration assisted tubing expansion
BRPI0503790B1 (pt) * 2004-09-08 2019-04-30 Dana Automotive Systems Group, Llc Método de fabricação de membro estriado
US7975519B1 (en) * 2007-01-30 2011-07-12 Tooman Norman L Wind turbine installation comprising an apparatus for protection of anchor bolts and method
ES2388122T5 (es) 2009-10-21 2017-05-05 Repkon Machine and Tool Industry and Trade Inc. Dispositivo y procedimiento para conformar piezas de trabajo

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US432463A (en) * 1890-07-15 white
US704316A (en) * 1900-08-28 1902-07-08 Josef Gieshoidt Machine for drawing tubes.
US1118864A (en) * 1913-11-14 1914-11-24 John George Inshaw Apparatus for the manufacture of hollow metal blooms or billets and tubes therefrom.
US1141424A (en) * 1914-10-23 1915-06-01 Frank E Simpkins Manufacture of seamless tubes.
US1528832A (en) * 1922-10-05 1925-03-10 Kellogg M W Co Apparatus for making seamless tubes
US2032917A (en) * 1932-11-02 1936-03-03 Charles B Cushwa Apparatus for drawing
US2887223A (en) * 1952-05-23 1959-05-19 Okonite Co Extrusion apparatus for sheathing electric cables

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3695076A (en) * 1969-12-02 1972-10-03 Kocks Gmbh Friedrich Method for manufacture of seamless tube
US4512177A (en) * 1982-06-30 1985-04-23 Sumitomo Metal Industries, Ltd. Method of manufacturing metallic materials having a circular cross section
US4602493A (en) * 1982-11-25 1986-07-29 Akademia Gorniczo-Hutnicza Im. Stanislawa Staszica Rolling mill for reducing the thickness of the wall of a tube
US20060157539A1 (en) * 2005-01-19 2006-07-20 Dubois Jon D Hot reduced coil tubing
CN112934974A (zh) * 2021-01-29 2021-06-11 西北工业大学 一种金属筒形件外轧挤压成形装置及成形方法

Also Published As

Publication number Publication date
FR1550085A (es) 1968-12-20
DE1602331A1 (de) 1970-04-23
SE328541B (es) 1970-09-21
ES340126A1 (es) 1968-06-01
GB1188374A (en) 1970-04-15
US3643485A (en) 1972-02-22
NL6706338A (es) 1967-11-06
DE1602332A1 (de) 1970-07-16
FR1554623A (es) 1969-01-24
AT289691B (de) 1971-05-10
CH515754A (fr) 1971-11-30
GB1190813A (en) 1970-05-06
BE698074A (es) 1967-11-06
JPS4817973B1 (es) 1973-06-02
SE344286B (es) 1972-04-10
BE697960A (es) 1967-10-16

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