US3798943A - Method and apparatus for cold-drawing metallic tubes - Google Patents

Method and apparatus for cold-drawing metallic tubes Download PDF

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Publication number
US3798943A
US3798943A US00265970A US26597072A US3798943A US 3798943 A US3798943 A US 3798943A US 00265970 A US00265970 A US 00265970A US 26597072 A US26597072 A US 26597072A US 3798943 A US3798943 A US 3798943A
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Prior art keywords
tube
lubricant
die
pressure
space
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US00265970A
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H Benteler
F Hartmann
H Hefendehl
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Benteler Deutschland GmbH
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Benteler Deutschland GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, wire, rods, tubes or like semi-manufactured products by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes specially adapted for making tubular articles
    • B21C1/24—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes specially adapted for making tubular articles by means of mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels for metal drawing
    • B21C3/02—Dies; Selection of material therefor; Cleaning thereof
    • B21C3/12—Die holders; Rotating dies
    • B21C3/14—Die holders combined with devices for guiding the drawing material or combined with devices for cooling, heating, or lubricating

Definitions

  • ABSTRACT Steel tubes are cold-drawn in a bench wherein the reducing die is located in front of a sleeve defining with the external surface of the tube to be cold-drawn an elongated tubular confining space which tapers toward the die at an angle of less than 3.
  • the space is filled with a lubricant at an elevated pressure of up to 100 atmospheres superatmospheric pressure, and such pressure rises automatically to a value exceeding at least 10 times the initial pressure when the tube is moved lengthwise at a speed of up to and in excess of 300 meters per minute.
  • the rise in pressure of confined lubricant is due in part to friction between the lubricant and the external surface of the tube and suffices to insure that the moving tube remains out of mechanical contact with the die.
  • a similar forwardly tapering confining space for reception of a pressurized lubricant can be provided between the internal surface of the tube and a confining member which is connected to and located behind a floating mandrel.
  • the thus treated tube can be subjected to one or more additional cold-drawing treatments to reduce its outer diameter from 8-35 millimeters to about 3 millimeters and its wall thickness from about 3.5 millimeters to about 1 millimeter.
  • the present invention relates to a method and apparatus for cold-drawing metallic tubes or billets, especially steel tubes. More particularly, the invention relates to improvements in a method and apparatus for cold-drawing tubes or billets (hereinafter called tubes) in a draw bench wherein the surfaces of the tubes are separated from internal and/or external diameterand- /or wall thickness-reducing devices by layers or films of a suitable lubricant.
  • An object of the invention is to provide a novel and improved method of cold-drawing metallic tubes, particularly steel tubes, by relying on the pressure of lubricant which coats the internal and/or external surfaces of tubular workpieces during transport through the reducing station.
  • Another object of the invention is to provide a novel and improved method of insuring the formation of and of maintaining a continuous film of lubricant between a rapidly moving metallic tube and internal and/or external diameterand/or wall thickness-reducing tools in a draw bench.
  • a further object of the invention is to provide a method which insures satisfactory cold-drawing of metallic tubes at speeds of up to and in excess of 300 meters per minute.
  • An additional object of the invention is to provide a novel and improved draw bench for cold-drawing of metallic tubes at a high rate of speed and with greatly reduced likelihood of damage to tubes and/or component parts of the draw bench.
  • Still another object of the invention is to provide a draw bench with novel and improved means for supplying and confining pressurized lubricant at the internal and/or external surfaces of moving metallic tubes.
  • a further object of the invention is to provide a draw bench wherein the pressurization of lubricant takes place automatically when the draw bench is in use and wherein such pressurization invariably suffices to insure the formation of an uninterrupted film of lubricant between internal and/or external reducing tools and the corresponding surfaces of metallic tubes.
  • the method of the present invention is utilized for cold-drawing of metallic tubes, especially steel tubes, and comprises the steps of establishing along at least one of the internal and external surfaces of the leading end of a metallic tube a confined tubular layer of pressurized lubricant which tapers slightly toward a circumferentially complete thickness-' and/or diameterreducing surface of a die or mandrel in a draw bench, and conveying the tube lengthwise relative to the reducing surface at an elevated speed with attendant additional pressurization of confined lubricant due in part to frictional engagement between the one surface of the moving tube and the layer of confined lubricant to thereby raise the pressure of confined lubricant to a value at which the one surface of the moving tube remains separated from the reducing surface by a continuous film of lubricant.
  • the initial pressure of lubricant is preferably less than atmospheres superatmospheric pr ess ure, and such pressure is increased to at least ten times the initial pressure when the tube is in motion.
  • the working pressure of lubricant may be in excess of 600 and preferably in excess of 1,000 atmospheres superatmospheric pressure.
  • the tube can be transported lengthwise at a speed of at least 200 and preferably at or in excess of 300 meters per minute.
  • the improved cold-drawing method can be practiced with seamless tubes or with welded tubes, and the diameter of the one surface of the tube can be reduced from 8-35 millimeters to as low as 3 millimeters. At the same time, the wall thickness of the moving tube can be reduced from 3.5 millimeters or more to less than 1 millimeter.
  • the reduction of the wall thickness and/or diameter of the tube can be effected in two or more passes whereby the tube is being pulled through a first die by transporting mechanism or mechanisms located between the first and second, second and third, etc., dies.
  • FIG. 1 is a fragmentary longitudinal sectional view of a draw bench which embodies the invention.
  • FIG. 2 is a diagrammatic plan view of a battery of draw benches and transporting devices for metallic tubes.
  • FIG. 1 there is shown a draw bench 2 which is utilized to reduce the internal and external diameters as well as the wall thickness of successive metallic tubes 1.
  • the draw bench 2 includes a frame having a holder 3 for a reducing die 4 which is fixedly but removably received in the holder.
  • the holder 3 further surrounds the front end portion of a confining sleeve 5 which defines with the leading end of a freshly introduced tube 1 a tubular space 12 tapering forwardly toward the die 4 at an angle y of not more than 3 and preferably about L5.
  • the space 12 surrounds the cylindrical external surface of the leading end of the tube 1 and its length is between 5 and 15 times the external diameter of the tube 1 prior to passage through the die 4.
  • the flange 50 at the forward end of the confining sleeve 5 is pressed against the die by a nut '7 which meshes with the rear end portion of the holder 3.
  • a sealing ring 6 is interposed between the die 4 and flange 5a to prevent escape of lubricant at the front end of the tubular space 12.
  • the frame of the draw bench 2 further comprises a ring-shaped housing 8 which surrounds the rear end portion of the confining sleeve 5 and is flanked by annular sealing elements 9.
  • a split ring 10 biases the lefthand sealing element 9 against the adjacent end face of the housing 8 with a force which suffices to prevent any appreciable escape of lubricant at both axial ends of the housing.
  • the housing 8 can be slipped off the lefthand end of the sleeve 5 upon removal of the split ring 10.
  • the housing 8 is provided with an internal annular groove or chamber 8a which communicates with several radial ports 11 of the confining sleeve 5; these ports communicate with the rear portion of the tubular space 12.
  • An inlet opening 13 of the housing 8 communicates with the chamber 8a and is connected with the liquid discharging opening of a pump P which can draw lubricant from a source T.
  • the pump P can be replaced by or provided in addition to an accumulator A. This pump can fill the space 12 with lubricant at a pressure of between 20-100 atmosphere superatmospheric pressure.
  • the draw bench 2 further comprises a floating mandrel 14a which is located at the front end of an elongated confining member 14 defining with the cylindrical internal surface of the leading end of the tube 1 a second tubular confining space 15 which tapers toward the die 4 at an angle 7 of not more than 3 and preferably about 1.5".
  • the axial length of the confining space 15 is preferably at least 5 times and up to 15 times the initial internal diameter of the tube 1. It will be seen that, in the illustrated embodiment, the axial length of the internal confining member 14 equals or aproximates the axial length of the sleeve-like external confining member 5.
  • the cylindrical portion 140' of the floating mandrel 14a is located in front of a portion 14b having a conical reducing surface which diverges toward the space 15 at an angle B of between 5 and 15, preferably about 9.
  • the conical portion 4a of the internal surface of the die 4 diverges toward the space 12 at an angle 0: of between 10 and 20, preferably about 15.
  • the conical surface of the portion 14b of the mandrel 14a is spaced from and is surrounded by the conical portion 4a of the internal surface of the die 4.
  • the reference character 16 denotes a supply pipe which furnishes pressurized lubricant from the pump P and/or accumulator A to the rear end of the confining space 15.
  • the initial pressure oflubricant in the confining space 15 is preferably between 20 and atmospheres superatmospheric pressure.
  • a conduit 17 supplies pressurized lubricant to an axial bore 18 which extends through the confining member 14 and mandrel 14a to admit lubricant to the tubular space 15 of the next draw bench (not shown in FIG. 1) which subjects the once-treated tube 1 to a second cold-drawing treatment.
  • FIG. 2 illustrates a combination of several draw benches including those numbered 2, 2a, 2b with transporting or pulling devices 30, 30a, 30b located downstream of the corresponding draw benches.
  • Each pulling device comprises a wheel 31 around which the tube 1 forms at least one convolution and which can be driven by a variable-speed electric motor 32.
  • the exact construction of the pulling devices 30, 30a, 30b is disclosed in our copending application Ser. No. 265,969 filed June 26, 1972 and entitled Multi-pass method and apparatus for cold-drawing of metallic tubes.
  • the draw bench 2b may but need not have a mandrel 14a.
  • the conduit 17 may be flexible, either entirely or in part, to insure a satisfactory feed of pressurized lubrucant in spite of the fact that the mandrel 14a floats in the interior of the tube 1. This conduit 17 can be omitted if the tube 1 is to be subjected to a single cold-drawing treatment.
  • the leading end of the tube 1 is introduced between the die 4 and mandrel 14a and is convoluted onto the wheel 31 of the pulling device 30.
  • the pump P is thereupon started to draw lubricant from the source T, to pressurize such lubricant, and to introduce it into the confining spaces 12 and 15 at a pressure of between 20 and 100 atmospheres superatmospheric pressure.
  • the motor 32 is started to move the tube 1 lengthwise at a speed of at least 200 and preferably at least 300 meters per minute whereby the pressure of lubricant which is confined in the spaces 12 and is automatically rises to at least 600 and preferably LOGO-3,000 atmospheres superatmopheric pressure.
  • the slight taper of spaces 12 and 15, coupled with the high speed of forward movement of the tube 1 and initial pressure oflubricant in the spaces 12 and 15, insures that the reduction in diameter of the tube 1 and the reduction of its wall thickness can be brought about exclusively by hydrodynamic pressure of the lubricant, i.e., without any mechanical contact between the mandrel 14a and/or die 4 and the respective surfaces of the tube 1.
  • the diameter of the tube 1 can be reduced from between 8- 35 millimeters to less than 3 millimeters, and the wall thickness of the tube can be reduced from more than 3.5 millimeters to 1.5 millimeters or even less than i millimeter. As mentioned above, such reduction in diameter and/or wall thickness can be achieved in a single pass or in two or more passes.
  • An important advantage of the improved method and draw bench is that the pump P must supply lubricant only prior to and/or during start of a cold-drawing operation and only at a pressure which suffices to insure satisfactory lubrication of the internal and/or external surface of the tube 1.
  • the pressure of confined lubricant rises automatically to that value which is necessary to insure contactless cold-drawing.
  • the outlay for the means which subects the lubricant in the confining space 15 and/or 12 to an initial pressure is only a small fraction of the outlay which would be necessary to artificially maintain the pressure at a value which is needed to insure contactless cold-drawing while the tube is moved lengthwise at the normal speed.
  • the hydrodynamic rise in pressure of lubricant as a result of friction between the moving tube and the stagnant layer or layers of confined lubricant is sufficient to insure the formation of a practically uninterrupted film of lubricant between the reducing surface or surfaces and the respective surface or surfaces of the tube, even if the lubricant is subjected to an initial (artificial) pressure as low as atmospheres superatmospheric pressure.
  • Another important advantage of the improved method and draw bench is that a continuous film of lubricant can be established and maintained not only between a die and the external surface of a tube but also between the internal surface of the tube and a floating mandrel.
  • the lubricant is sucked and/or pushed into the minute clearances between the reducing surfaces and the corresponding surfaces of the rapidly moving tube wereby the afordescribed length and taper of the spaces 12 and 15 contribute to a rapid and substantial rise in the pressure of confined lubricant to at least ten times the initial pressure.
  • the extent to which the pressure of confined lubricant will rise also depends on the speed of lengthwise movement and surface finish of the tube; these factors influence the friction between the layers of lubricant and the workpiece.
  • the actual reduction in the wall thickness and diameter of the tube is effected by the highly pressurized lubricant in the region of conical surfaces on the mandrel 14a and in the die 4.
  • the draw bench When the draw bench is in use, there develops an equilibrium between the necessary diameterand wall thickness-reducing pressure and the maximum achievable pressure of lubricant; therefore, the reducing action is practically independent of the initial wall thickness and diameter as well as quality of the material of the tube, as long as the length of the spaces 12, 15, their taper toward the die and the finish of surfaces on the tube remain unchanged and the tube is transported at a sufficiently high speed (a feature which is evidently desirable in cold-drawing of metallic tubes).
  • the taper of the spaces 12 and 15 will be selected in dependency on the roughness or smoothness of the corresponding surfaces of the tube as well as on the speed at which the tube is transported through the die 4.
  • the moving tube can increase the initial pressure of lubricant to at least 600 and preferably at least 1,000 atmospheres superatmospheric pressure, and the speed of the tube 1 is preferably at least 200 and most preferably about 300 meters per minute, i.e., a speed which is much higher than in presently known draw benches.
  • the improved method and apparatus can be utilized for treatment of seamless metallic tubes as well as for treatment of welded tubes.
  • the initial diameter of the tubes is preferably in the range of 8-35 millimeters and the initial wall thickness is less than 3.5 millimeters or even less than 1.5 millimeters.
  • the wall thickness of the tubes can be reduced to less than 1 millimeter and their diameter to less than 3 millimeters, especially by utilizing a battery of two or more draw benches and interposed transporting or pulling devices.
  • a method of cold-drawing metallic tubes, particularly steel tubes which comprises establishing along the internal and external surfaces of the leading end of a tube confined layers of pressurized lubricant which respectively taper slightly forwardly toward a circumferentially complete thickness-reducing external surface of a floating mandrel and toward a circumferentially complete thickness-reducing internal surface of a reducing die; and conveying the tube lengthwise relative to the reducing surfaces at an elevated speed with attendant additional substantial pressurization of lubricant due to frictional engagement between the layers of lubricant and said internal and external surfaces to thereby raise the pressure of confined lubricant to a value at which said internal and external surfaces of the moving tube remain separated from the respective reducing surfaces by continuous films of lubricant.
  • said conveying step comprises pulling the tube at at least one point located downstream of said thickness-reducing surfaces, and further comprising the step of subjecting the once drawn tube to at least one additional cold drawing operation with attendant additional reduction in wall thickness and external diameter of the tube.
  • a combination comprising a reducing die; first confining means located upstream of said die and defining with the external surface of a tube which extends into said die a dirst tubular space tapering toward said die; a mandrel disposed within the tube in the interior of said die; second confining means dieposed behind said mandrel and defin ing with the internal surface of the tube a second tubular space which tapers toward said mandrel; means for introducing into said tubular spaces a lubricant at an elevated pressure so that such lubricant completely fills said tubular spaces; and conveying means for moving the tube lengthwise at an elevated speed with attendant additional substantial pressurization of confined lubricant in said tubular spaces due to frictional engagement between the lubricant and the external and internal surfaces of the moving tube to thereby raise the pressure of lubricant in said tubular spaces to a value at which said external and internal surfaces of the moving tube respectively remain separated from
  • a combination comprising a battery of at least two draw benches each having a reducing die, first confining means located upstream of the die and defining with the external surface of a tube which extends into said die a tubular space tapering toward the die, a floating mandrel disposed within the tube in the interior of the die, second confining means disposed behind said mandrel and defining with the internal surface of the tube a second tubular space which tapers toward said mandrel, and means for introducing into said tubular spaces a lubricant at an elevated pressure so that the lubricant completely fills said spaces; first conveying means located downstream of that one of said draw benches through which a tube passes prior to entering the other of said draw benches; and second conveying means located downstream of said other draw bench, said first and second conveying means being arranged to move a tube lengthwise at an elevated speed with attendant additional substantial pressurization of confined lubricant in said spaces of said draw benches due

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
US00265970A 1971-06-24 1972-06-26 Method and apparatus for cold-drawing metallic tubes Expired - Lifetime US3798943A (en)

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DE19712131343 DE2131343A1 (de) 1971-06-24 1971-06-24 Verfahren und vorrichtung zum kaltziehen von metallrohren, insbesondere aus stahl

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US (1) US3798943A (enrdf_load_stackoverflow)
JP (1) JPS5147151B1 (enrdf_load_stackoverflow)
AR (1) AR193879A1 (enrdf_load_stackoverflow)
AT (1) AT324269B (enrdf_load_stackoverflow)
BE (1) BE785273A (enrdf_load_stackoverflow)
BR (1) BR7204113D0 (enrdf_load_stackoverflow)
CA (1) CA954071A (enrdf_load_stackoverflow)
CH (1) CH563197A5 (enrdf_load_stackoverflow)
DE (1) DE2131343A1 (enrdf_load_stackoverflow)
ES (2) ES403301A1 (enrdf_load_stackoverflow)
FR (1) FR2143193B1 (enrdf_load_stackoverflow)
GB (1) GB1389043A (enrdf_load_stackoverflow)
IT (1) IT965825B (enrdf_load_stackoverflow)
LU (1) LU65577A1 (enrdf_load_stackoverflow)
NL (1) NL167339C (enrdf_load_stackoverflow)
SE (1) SE405453B (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4380917A (en) * 1980-02-22 1983-04-26 Hitachi, Ltd. Tube-bending machine
DE3223942A1 (de) * 1981-07-09 1983-07-14 VEB Edelstahlwerk 8. Mai 1945 Freital, DDR 8210 Freital Verfahren zum ein- oder mehrstufigen ziehen von metallischem umformgut
DE3223944A1 (de) * 1981-07-09 1983-09-01 VEB Edelstahlwerk 8. Mai 1945 Freital, DDR 8210 Freital Verfahren zum mehrstufigen ziehen
US4805435A (en) * 1987-01-29 1989-02-21 Showa Aluminum Kabushiki Kaisha Method for producing aluminum drums having highly smooth surface
US5076084A (en) * 1989-03-27 1991-12-31 Sumitomo Metal Industries, Ltd. Method of manufacturing long tubes having small diameters
US5253678A (en) * 1989-03-27 1993-10-19 Sumitomo Metal Industries, Ltd. Long tube having a small diameter
US5460024A (en) * 1992-05-04 1995-10-24 American National Can Company Apparatus for drawing and ironing metallic or metalloplastic cans
US5557981A (en) * 1993-05-25 1996-09-24 Tamco Limited One-piece gearshift lever with cold formed end
US5992197A (en) * 1997-03-28 1999-11-30 The Budd Company Forming technique using discrete heating zones
US6006568A (en) * 1998-03-20 1999-12-28 The Budd Company Multi-piece hydroforming tool
US6098437A (en) * 1998-03-20 2000-08-08 The Budd Company Hydroformed control arm
US6209372B1 (en) 1999-09-20 2001-04-03 The Budd Company Internal hydroformed reinforcements
US6568076B2 (en) * 1998-06-05 2003-05-27 Halliburton Energy Services, Inc. Method of making an internally profiled stator tube
CN102847740A (zh) * 2012-09-28 2013-01-02 李维生 主动螺旋挤压式强迫润滑拉拔模盒
USRE44308E1 (en) * 2004-01-16 2013-06-25 Nippon Steel & Sumitomo Metal Corporation Method for manufacturing seamless pipes or tubes
EP2583763A4 (en) * 2010-06-15 2014-01-22 Nippon Steel & Sumitomo Metal Corp COLD COLLECTION METHOD FOR METAL PIPES AND METHOD FOR PRODUCING METAL TUBES USING THIS METHOD
CN111495996A (zh) * 2020-05-13 2020-08-07 华中科技大学 一种微型薄壁金属管的充液拉拔装置及方法

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DE2558671C2 (de) * 1975-12-24 1985-10-24 Benteler-Werke Ag, 4794 Schloss Neuhaus Kaltziehvorrichtung zum Reduzieren von Rohren
DE2921622A1 (de) * 1979-05-28 1980-12-04 Hitachi Cable Verfahren und vorrichtung zum fluessigschmierenden ziehen fuer geschichteten metalldraht
BG41686A1 (en) * 1984-12-17 1987-08-14 Petkov Device for drawing of wire
FR2820660B1 (fr) * 2001-02-14 2003-04-04 Roger Marcel Sabau Dispositif permettant de trefiler ou d'etirer les metaux, ferreux et non ferreux (fils, barres, tubes) avec une usure quasi-nulle des filieres et un respect total de l'etat de surface de tous les produits fabriques
FR2820661B1 (fr) * 2001-02-14 2004-09-24 Roger Marcel Sabau Dispositif permettant de trefiler ou d'etirer les metaux ferreux et non ferreux (fils, barres, tubes) avec une usure quasi-nulle des filieres et un respect total de l'etat de surface de tous les produits fabriques
EP1388379A1 (fr) * 2002-08-08 2004-02-11 Roger Sabau Dispositif permettant de tréfiler ou étirer (fils, barres, tubes) avec une usure quasi-nulle des filières et l'obtention de conditions tribologiques optimales

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US2351710A (en) * 1941-03-05 1944-06-20 Nat Tube Co Cold-drawing pipes and tubes
US2308120A (en) * 1941-06-09 1943-01-12 Lewin Mathes Company Tube drawing apparatus
US2355734A (en) * 1943-05-06 1944-08-15 Bundy Tubing Co Floating pin mandrel
US3292407A (en) * 1964-06-18 1966-12-20 Bruce B Krost Tube drawing apparatus
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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4380917A (en) * 1980-02-22 1983-04-26 Hitachi, Ltd. Tube-bending machine
DE3223942A1 (de) * 1981-07-09 1983-07-14 VEB Edelstahlwerk 8. Mai 1945 Freital, DDR 8210 Freital Verfahren zum ein- oder mehrstufigen ziehen von metallischem umformgut
DE3223944A1 (de) * 1981-07-09 1983-09-01 VEB Edelstahlwerk 8. Mai 1945 Freital, DDR 8210 Freital Verfahren zum mehrstufigen ziehen
US4805435A (en) * 1987-01-29 1989-02-21 Showa Aluminum Kabushiki Kaisha Method for producing aluminum drums having highly smooth surface
US5076084A (en) * 1989-03-27 1991-12-31 Sumitomo Metal Industries, Ltd. Method of manufacturing long tubes having small diameters
US5253678A (en) * 1989-03-27 1993-10-19 Sumitomo Metal Industries, Ltd. Long tube having a small diameter
US5460024A (en) * 1992-05-04 1995-10-24 American National Can Company Apparatus for drawing and ironing metallic or metalloplastic cans
US5557981A (en) * 1993-05-25 1996-09-24 Tamco Limited One-piece gearshift lever with cold formed end
US5992197A (en) * 1997-03-28 1999-11-30 The Budd Company Forming technique using discrete heating zones
US6098437A (en) * 1998-03-20 2000-08-08 The Budd Company Hydroformed control arm
US6006568A (en) * 1998-03-20 1999-12-28 The Budd Company Multi-piece hydroforming tool
US6568076B2 (en) * 1998-06-05 2003-05-27 Halliburton Energy Services, Inc. Method of making an internally profiled stator tube
US6209372B1 (en) 1999-09-20 2001-04-03 The Budd Company Internal hydroformed reinforcements
USRE44308E1 (en) * 2004-01-16 2013-06-25 Nippon Steel & Sumitomo Metal Corporation Method for manufacturing seamless pipes or tubes
EP2583763A4 (en) * 2010-06-15 2014-01-22 Nippon Steel & Sumitomo Metal Corp COLD COLLECTION METHOD FOR METAL PIPES AND METHOD FOR PRODUCING METAL TUBES USING THIS METHOD
US9120136B2 (en) 2010-06-15 2015-09-01 Nippon Steel & Sumitomo Metal Corporation Drawing method of metallic tube and producing method of metallic tube using same
CN102847740A (zh) * 2012-09-28 2013-01-02 李维生 主动螺旋挤压式强迫润滑拉拔模盒
CN102847740B (zh) * 2012-09-28 2014-12-10 李维生 主动螺旋挤压式强迫润滑拉拔模盒
CN111495996A (zh) * 2020-05-13 2020-08-07 华中科技大学 一种微型薄壁金属管的充液拉拔装置及方法
CN111495996B (zh) * 2020-05-13 2021-02-12 华中科技大学 一种微型薄壁金属管的充液拉拔装置及方法

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CA954071A (en) 1974-09-03
NL167339B (nl) 1981-07-16
CH563197A5 (enrdf_load_stackoverflow) 1975-06-30
FR2143193A1 (enrdf_load_stackoverflow) 1973-02-02
ES403301A1 (es) 1976-01-01
NL7208678A (enrdf_load_stackoverflow) 1972-12-28
IT965825B (it) 1974-02-11
AT324269B (de) 1975-08-25
JPS5147151B1 (enrdf_load_stackoverflow) 1976-12-13
AR193879A1 (es) 1973-05-31
LU65577A1 (enrdf_load_stackoverflow) 1972-10-25
SE405453B (sv) 1978-12-11
NL167339C (nl) 1981-12-16
GB1389043A (en) 1975-04-03
FR2143193B1 (enrdf_load_stackoverflow) 1978-06-02
BE785273A (fr) 1972-12-22
ES430920A1 (es) 1976-10-16
DE2131343A1 (de) 1973-01-11
BR7204113D0 (pt) 1973-07-24

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