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US3229489A - Process and apparatus for bending tubes - Google Patents

Process and apparatus for bending tubes Download PDF

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Publication number
US3229489A
US3229489A US207243A US20724362A US3229489A US 3229489 A US3229489 A US 3229489A US 207243 A US207243 A US 207243A US 20724362 A US20724362 A US 20724362A US 3229489 A US3229489 A US 3229489A
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United States
Prior art keywords
tube
bending
bend
portions
heating
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Expired - Lifetime
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US207243A
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English (en)
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Huet Andre
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/023—Half-products, e.g. films, plates
    • B29B13/024—Hollow bodies, e.g. tubes or profiles
    • 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
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
    • B21C37/283—Making U-pieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
    • B21D7/162—Heating equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/16—Auxiliary equipment, e.g. machines for filling tubes with sand
    • B21D9/18—Auxiliary equipment, e.g. machines for filling tubes with sand for heating or cooling of bends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/08—Bending or folding of tubes or other profiled members
    • B29C53/083—Bending or folding of tubes or other profiled members bending longitudinally, i.e. modifying the curvature of the tube axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/80—Component parts, details or accessories; Auxiliary operations
    • B29C53/84—Heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid
    • 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
    • Y10T29/49403—Tapping device making

Definitions

  • the object of this invention is a process in which a tube is bent by subjecting a narrow band of the tube at the point where bending is going on, to intense local heating, which moves forward as bending proceeds. As soon as a part of the tube has passed the bending device, it is strongly cooled so as to become rigid again. This part of the tube being restored to its normal rigidity then serves as hearing for the following part, which is heated, bent and cooled in its turn, and so on.
  • the tube in the first method, is forced, by rollers moving it forward, for example, against a bearing surface which makes an angle with the direction of motion of the tube, which produces the required bending effect.
  • This bearing surface which is located at the outside of the bend may consist of one or more deeply-grooved rollers or a curved guide-block; the bottom of the groove in either of these acts on the part of the tube which will be the outside of the bend formed.
  • the heating devices may be located inside the bend being formed and the cooling devices immediately after them.
  • the heating and cooling devices are preferably separated by a refractory screen which may be arranged to direct the heating and/ or cooling media one way or the other.
  • the heater-jets or blowpipes are preferably turned against the direction of motion of the tube.
  • a round mandrel may be disposed inside the tube to direct the tube, from within, against the throat of the guide roller or die.
  • This mandrel may be hollow, so as to convey means of heating, or cooling, or both, to supplement the action of the similar devices acting outside within the curve. Heating and/or cooling by the mandrel may take the place of heating and/ or cooling from outside.
  • the tube is drawn through and coiled up on a bending drum the jaws of which support the sides of the tube.
  • the drum may be cut away at the centre and the means of heating and cooling located within it. The radius of this drum determines the radius of the bend produced.
  • FIG. 1 shows diagrammatically the tube in process of bending against a bearing roller.
  • FIG. 2 is large scale detail showing the heating and cooling device under the tube, in the process illustrated in FIG. 1.
  • FIG. 3 is a detail of the same device, showing in elevation the screen between heating and cooling devices.
  • FIG. 4 shows diagrammatically the second method, by drawing the tube through the bending device.
  • FIG. 5 is a section on V-V FIG. 4, to a larger scale
  • FIG. 6 is a larger-scale part-view of the roller in FIG. 4, showing heating and cooling devices located inside the roller or drum.
  • the tube a is thrust forward by the rollers b in the direction of the arrow A.
  • the tube is thus forced against the roller 0 called the bending roller, which has deep jaws d and is mounted to slide on the work table in two directions at right angles (arrows B and C) to any convenient position, at which it is locked during the operation.
  • the bottom of the groove in the roller c bears against the outside of the tube a and causes it to bend.
  • the redius of the bend in the tube is set by the position of the roller on the table.
  • a second roller e also mounted to slide in two directions at right angles, is placed behind roller 0 to complete the bending and if necessary to reduce the radius of the bend.
  • a straight guide block M FIG. 1, guides the tube from roller 0 to roller 2.
  • FIG. 2 The inside of the curve is clear and a curved mounting is fitted at this point, (FIGS. 2 and 3) which is curved to suit the tube and carries oxy-acetylene blowpipes or the like, the flame direction of which is preferably turned against the direction of movement of the tube.
  • the mounting f is hinged at f e.g. to the screen It so as to swing towards or away from the tube a (FIG. 1) so that the strongest heat is at D, FIG. 1, where the bend is being made, and is applied to a relatively narrow band of the tube surface. This band is at right angles of the axis of the tube and embraces about of the perimeter (FIG. 3) but it may embrace or more if the tube is a thick one.
  • such a hand does not necessarily extend around the entire tube, and it may be defined as a narrow portion of tube extending circumferentially of the tube.
  • the ratio of tube thickness to the width of the band D of maximum heating is in general selected to avoid any buckling whatever. The only thing which may occur is a thickening of the tube wall at this point caused by the bending effort exercised by the rollers.
  • the heating asembly f is succeeded by a cooling device g. Between these is placed a screen of refractory, or highmelting point metal. In the method shown in FIG. 1 a groove 12 (FIG. 2) is formed in the screen, to supply the cooling fluid to the jets i (FIG. 2) which projects it on to the tube immediately after the band D which has been heated and bent.
  • the cooling device h preferably embraces a larger sector of the tube than the heater 1 (see FIG. 2, where 11 projects to both sides of the tube). This is to cool the sides of the tube beyond the heated area.
  • the cooling fluid may be compressed air, or preferably CO nitrogen or a neutral gas, and may be humidified if required so as to produce a mist which chills the metal rapidly and completely without the risk of igniting it.
  • the heating and cooling devices are so mounted as to be adjustable, so that the band D of maximum heating be located at the required spot.
  • a mandrel j Inside the tube is placed a mandrel j the rounded head of which bears on the inside of the tube at the point B FIG. 1, i.e. where the outer wall of the bend is being formed. This mandrel keeps the tube rigid between the rollers b which propel it, and the bending roller 0.
  • mandrel may be provided with a bore to convey a gas mixture j to the head of the mandrel so as to heat the zone D opposite the external heater f or instead of it.
  • a bore may also be provided inside the mandrel to convey cooling fluid which may be sprayed against the inside of the tube beyond the heating zone D, or even in line with it, to form at that point a thin cold crust which improves the working of the metal in regard to the thickening of the tube wall, preventing any possibility of internal folding.
  • the tube may be cooled opposite the cooling device g or in place of it.
  • the device acts as follows:
  • the tube which may be of steel, is entered between the drive rollers band the mandrel is placed inside it.
  • the end of the tube bears against the bottom of the groove of roller 0.
  • the heater jets raise the point D to the maximum temperature which may be 1200 C.
  • the tube is bent and as it passes the screen it, the cooling device reduces the heated zone to about 600 or 700". At this temperature the tube regains its rigidity, while, in the case of special steels, it is still above the transformation point.
  • the metal is thickened inside the bend at D during bending, while the bore of the tube at the bend can increase, as there is nothing at the inside of the bend to prevent this.
  • the deep jaws of the roller c and if required, of e, by supporting the tube laterally during bending aid the movement of the metal from the inside of the bend towards the bending axis (lower part of FIG. 1) with the result that the thickening of the wall inside the bend is checked while the bore of the tube is increased.
  • the tube After the tube has passed the cooling zone it may if required be reheated to restore the structure of the metal.
  • the tube is bent by being drawn through the bending assemblying and rolled up on a drum 1 which occupies the inside line of the bend.
  • the tube is guided by a sleeve k fixed to the work table. This may be replaced by bearing rollers. It is caught up by a finger n on the drum 1 and the drum revolving in the direction of the arrow F bends the tube.
  • This drum (FIG. 5) has deep jaws which completely embrace the tube, and it is cut away centrally at M (FIG. 5), leaving rounded shoulders I at both sides of the tube. The tube bears on these during bending. The space inside the drum allows the metal of the tube to move towards the roller spindle in thus increasing the bore of the finished bend.
  • heating and cooling devices 1 and g separated by the screen it may be located within the drum as in FIG. 4, so that the heat is applied at the point where the bending actually begins.
  • This point of maximum heating D remains fixed during the whole period of rotation of the rollers and the heating and cooling devices 1 and g can therefore be fixed on their mounting within the bending drum. They can however be adjusted at a greater or less distance from the tube in order to regulate temperatures.
  • a mandrel may be inserted in the tube, which can be arranged to heat and/or cool the latter during bending, from within.
  • the above device allows of making very small radius bends, even less than the tube diameter, i.e., for a bend of 180, the distance between the two straight legs of the bent tube may be equal to the tube diameter.
  • the range of adjustment of the heating and cooling devices makes it possible to bend thin walled tubes e.g. of a wall thickness of the diameter.
  • Method of bending a steel tube comprising providing a steel tube of uniform wall thickness, subjecting in each of a number of circumferentially extending narrow portions of the tube successively to heating while exerting upon said portions a thrust force applied longitudinally of the tube, to cause a thickening of the metal at said portions, each of said portions being left laterally unsupported at least on the outer face surface thereof while said thickening is taking place, with the tube being supported on the outside of the bend.
  • Method of bending a steel tube comprising, providing a steel tube of substantially uniform wall thickness, subjecting in turns each of a number of circumferentially extending narrow portions of the tube material to a heat while exerting upon said portion a thrust force applied longitudinally of the tube to cause thickening of said portion at its point of maximum temperature, said portion being left laterally unsupported along its outer face during said thickening, with the tube being supported on the outside of the band, said heat being applied concurrently inside and outside the tube.
  • Method of bending a length of tube comprising, providing a tube subjecting in succession each of a number of adjacent circumferentially extending narrow portions of said length of tube to a series of operations which comprises in uninterrupted succession heating said portions with, while applying to said section -a thrust force directed longitudinally of the tube to cause a thickening of the metal in each of said portions under the efiect of said force, and cooling said portion, each of said operations progressing without interruption from end to end of said length of tube.
  • Method of bending a length of tube which consists in subjecting in turns each of a number of adjacent narrow circumferentially extending portions on said length of tube to a series of operations which comprises in uninterrupted succession the heating of said portion, the thickening of the metal in said portion under the effect of a thrust force applied longitudinally of the tube and the cooling of said portion, said portion being laterally unsupported on its outer face while said thickening is taking place, each of said operations progressing without interruption from end to end of said portion of tube.
  • Apparatus for bending a tube comprising: means for guiding a portion of said tube along a straight path;
  • a heating device located between said two means for softening a narrow portion of tube material extending circumferentially of the tube;
  • a cooling device disposed relative to said heating device in the direction of progression of the tube and disposed for cooling each of said portions after bending;
  • said impelling means and said guiding means comprising a series of driving rollers located to advance said tube towards said directing means; said directing means comprising a plurality of rollers,
  • Apparatus according to claim 6 including a mandrel, inserted within the straight part of tube to be bent.
  • said mandrel includes means for heating and for cooling the tube from inside.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US207243A 1961-07-17 1962-07-03 Process and apparatus for bending tubes Expired - Lifetime US3229489A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR868100A FR1302529A (fr) 1961-07-17 1961-07-17 Procédé et dispositifs pour le cintrage des tubes

Publications (1)

Publication Number Publication Date
US3229489A true US3229489A (en) 1966-01-18

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ID=8759427

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US207243A Expired - Lifetime US3229489A (en) 1961-07-17 1962-07-03 Process and apparatus for bending tubes

Country Status (5)

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US (1) US3229489A (xx)
BE (1) BE617927A (xx)
CH (1) CH384335A (xx)
FR (1) FR1302529A (xx)
NL (1) NL279654A (xx)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3357221A (en) * 1962-10-01 1967-12-12 Wilman Sigismond Method of bending tubes and machine therefor
US3368377A (en) * 1965-09-17 1968-02-13 Hirayama Atsuo Methods of bending electrically conductive long materials such as bar, rod, and pipe, and means therefor
US3388573A (en) * 1965-09-20 1968-06-18 Ned H. Presley Jr. Tube bending method and machine
US3444716A (en) * 1966-06-13 1969-05-20 Calumet & Hecla Device for bending,coiling,or straightening tubing
US4061005A (en) * 1975-09-18 1977-12-06 Daiichi Koshuha Kogyo Kabushiki Kaisha Method and apparatus for continuous bending of elongated materials
US4151732A (en) * 1976-09-03 1979-05-01 Cojafex B.V. Process and device for bending elongated articles
US4432123A (en) * 1979-11-15 1984-02-21 Uhde Gmbh Process for the manufacture of double walled pipe
US4596128A (en) * 1984-07-26 1986-06-24 Cojafex Bv Method and apparatus for bending elongate workpieces, particularly pipes
US6038902A (en) * 1998-01-23 2000-03-21 The Babcock & Wilcox Company Intrados induction heating for tight radius rotary draw bend
US20050092053A1 (en) * 2003-10-31 2005-05-05 Guoxiang Zhou Grille and method and apparatuses for manufacturing it
US20050103085A1 (en) * 2003-11-17 2005-05-19 Melter S.A. De C.V. Water cooled panel and forming method
US20080066517A1 (en) * 2005-03-03 2008-03-20 Atsushi Tomizawa Method for bending metal material, bending machine, bending-equipment line, and bent product
EP1916090A1 (de) * 2006-10-25 2008-04-30 Protex Plastics GmbH Verfahren zur Herstellung von Kunststoffbauteilen
US20100218580A1 (en) * 2005-03-03 2010-09-02 Atsushi Tomizawa Method for three-dimensionally bending workpiece and bent product
US20100218577A1 (en) * 2005-03-03 2010-09-02 Sumitomo Metal Industries, Ltd. Three-dimensionally bending machine, bending-equipment line, and bent product
US20100314091A1 (en) * 2003-11-17 2010-12-16 Melter S.A. De C.V. Water cooled panel
US20120003496A1 (en) * 2009-01-14 2012-01-05 Sumitomo Metal Industries, Ltd. Hollow member and an apparatus and method for its manufacture
US20120325806A1 (en) * 2010-01-06 2012-12-27 Sumitomo Metal Industries, Ltd. Induction heating coil, and an apparatus and method for manufacturing a worked member
US20160229109A1 (en) * 2013-09-12 2016-08-11 FutureFibres LLC Composite rod with contiguous end terminations and methods for making them

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT390743B (de) * 1988-09-16 1990-06-25 Voest Alpine Stahl Donawitz Verfahren zur herstellung von windungslegerrohren

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US682070A (en) * 1901-04-16 1901-09-03 Hubert Chauncey Hart Machine for making washers.
DE499627C (de) * 1930-06-13 Willy Scharff Biegemaschine
US1888891A (en) * 1930-05-31 1932-11-22 Schmidt Alfred Process for manufacturing bent pipes
US1891338A (en) * 1931-02-09 1932-12-20 Lester W Snell Method of and means for bending tubes
US2221417A (en) * 1938-11-18 1940-11-12 Taylor James Hall Means for finishing bends
US2391252A (en) * 1944-06-12 1945-12-18 Gen Motors Corp Refrigerating apparatus
US2433055A (en) * 1944-12-20 1947-12-23 Linde Air Prod Co Apparatus for bending pipe

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE499627C (de) * 1930-06-13 Willy Scharff Biegemaschine
US682070A (en) * 1901-04-16 1901-09-03 Hubert Chauncey Hart Machine for making washers.
US1888891A (en) * 1930-05-31 1932-11-22 Schmidt Alfred Process for manufacturing bent pipes
US1891338A (en) * 1931-02-09 1932-12-20 Lester W Snell Method of and means for bending tubes
US1996838A (en) * 1931-02-09 1935-04-09 Lester W Snell Method of and means for bending tubes
US2221417A (en) * 1938-11-18 1940-11-12 Taylor James Hall Means for finishing bends
US2391252A (en) * 1944-06-12 1945-12-18 Gen Motors Corp Refrigerating apparatus
US2433055A (en) * 1944-12-20 1947-12-23 Linde Air Prod Co Apparatus for bending pipe

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3357221A (en) * 1962-10-01 1967-12-12 Wilman Sigismond Method of bending tubes and machine therefor
US3368377A (en) * 1965-09-17 1968-02-13 Hirayama Atsuo Methods of bending electrically conductive long materials such as bar, rod, and pipe, and means therefor
US3388573A (en) * 1965-09-20 1968-06-18 Ned H. Presley Jr. Tube bending method and machine
US3444716A (en) * 1966-06-13 1969-05-20 Calumet & Hecla Device for bending,coiling,or straightening tubing
US4061005A (en) * 1975-09-18 1977-12-06 Daiichi Koshuha Kogyo Kabushiki Kaisha Method and apparatus for continuous bending of elongated materials
US4151732A (en) * 1976-09-03 1979-05-01 Cojafex B.V. Process and device for bending elongated articles
USRE30639E (en) * 1976-09-03 1981-06-09 Cojafex B.V. Process and device for bending elongated articles
US4432123A (en) * 1979-11-15 1984-02-21 Uhde Gmbh Process for the manufacture of double walled pipe
US4596128A (en) * 1984-07-26 1986-06-24 Cojafex Bv Method and apparatus for bending elongate workpieces, particularly pipes
DE19902271B4 (de) * 1998-01-23 2006-03-23 The Babcock & Wilcox Co. Verfahren zum Herstellen eines Bogens von engem Radius in einem Rohr
US6038902A (en) * 1998-01-23 2000-03-21 The Babcock & Wilcox Company Intrados induction heating for tight radius rotary draw bend
US20050092053A1 (en) * 2003-10-31 2005-05-05 Guoxiang Zhou Grille and method and apparatuses for manufacturing it
US20060277963A1 (en) * 2003-11-17 2006-12-14 Melter S.A. De C.V. Water cooled panel
US7121131B2 (en) * 2003-11-17 2006-10-17 Melter S.A. De C.V. Water cooled panel and forming method
US20050103085A1 (en) * 2003-11-17 2005-05-19 Melter S.A. De C.V. Water cooled panel and forming method
US8235100B2 (en) 2003-11-17 2012-08-07 Melter, S.A. De C.V. Water cooled panel
US20100314091A1 (en) * 2003-11-17 2010-12-16 Melter S.A. De C.V. Water cooled panel
US20100218580A1 (en) * 2005-03-03 2010-09-02 Atsushi Tomizawa Method for three-dimensionally bending workpiece and bent product
US20100218577A1 (en) * 2005-03-03 2010-09-02 Sumitomo Metal Industries, Ltd. Three-dimensionally bending machine, bending-equipment line, and bent product
US20080066517A1 (en) * 2005-03-03 2008-03-20 Atsushi Tomizawa Method for bending metal material, bending machine, bending-equipment line, and bent product
US8863565B2 (en) * 2005-03-03 2014-10-21 Nippon Steel & Sumitomo Metal Corporation Three-dimensionally bending machine, bending-equipment line, and bent product
US8919171B2 (en) 2005-03-03 2014-12-30 Nippon Steel & Sumitomo Metal Corporation Method for three-dimensionally bending workpiece and bent product
EP1916090A1 (de) * 2006-10-25 2008-04-30 Protex Plastics GmbH Verfahren zur Herstellung von Kunststoffbauteilen
US20120003496A1 (en) * 2009-01-14 2012-01-05 Sumitomo Metal Industries, Ltd. Hollow member and an apparatus and method for its manufacture
US8833127B2 (en) * 2009-01-14 2014-09-16 Nippon Steel & Sumitomo Metal Corporation Hollow member and an apparatus and method for its manufacture
US20120325806A1 (en) * 2010-01-06 2012-12-27 Sumitomo Metal Industries, Ltd. Induction heating coil, and an apparatus and method for manufacturing a worked member
US9604272B2 (en) * 2010-01-06 2017-03-28 Nippon Steel & Sumitomo Metal Corporation Induction heating coil, and an apparatus and method for manufacturing a worked member
US10406581B2 (en) 2010-01-06 2019-09-10 Nippon Steel Corporation Method for manufacturing a worked member using an induction heating coil
US20160229109A1 (en) * 2013-09-12 2016-08-11 FutureFibres LLC Composite rod with contiguous end terminations and methods for making them

Also Published As

Publication number Publication date
BE617927A (fr) 1962-09-17
NL279654A (xx)
FR1302529A (fr) 1962-08-31
CH384335A (fr) 1964-11-15

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