US3812702A - Multi-pass method and apparatus for cold-drawing of metallic tubes - Google Patents

Multi-pass method and apparatus for cold-drawing of metallic tubes Download PDF

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Publication number
US3812702A
US3812702A US00265969A US26596972A US3812702A US 3812702 A US3812702 A US 3812702A US 00265969 A US00265969 A US 00265969A US 26596972 A US26596972 A US 26596972A US 3812702 A US3812702 A US 3812702A
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Prior art keywords
tube
dies
die
combination
successive
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US00265969A
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English (en)
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H Benteler
F Hartmann
H Hefendehl
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Benteler Deutschland GmbH
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Individual
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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
    • B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
    • B21C1/04—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums with two or more dies operating in series
    • 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
    • B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
    • B21C1/12—Regulating or controlling speed of drawing drums, e.g. to influence tension; Drives; Stop or relief mechanisms

Definitions

  • the present invention relates to a method and apparatus for cold-drawing metallic tubes in a series of successive passes by pulling the tubes through a succession of reducing dies.
  • the cold-drawing of metallic tubes in a plurality of passes invariably involves extensive auxiliary treatment of tubes upon completion of each pass, Such auxiliary treatment prolongs the cold-drawing operation and contributes to complexity of the draw benches.
  • the speed of rolls increases from stand to stand so that the stretching of a tube can exceed or can be reduced below that which corresponds to the reduction of diameter.
  • the wall thickness can be reduced simultaneously with a reduction of external diameter whereby the extent of reduction in wall thickness depends on the magnitude of applied tensional stresses which produce a reaction force. This force is built up as a result of frictional engagement with the rolls of the foremost stands and must be reduced during passage of the tube between the rolls of the last stands.
  • the just described treatment in stretch-reducing mills exhibits the drawback that the reduction in wall thickness is not uniform because the tensional stresses to which the moving tube is subjected during passage through the roll stands cannot be measured with the necessary degree of accuracy.
  • An object of the invention is to provide a novel and improved method of reducing the diameters and/or wall thicknesses of metallic tubes in a succession of passes and in a reproducible manner.
  • Another object of the invention is to provide a novel and improved cold-drawing method of treating metallic tubes which allows for substantial and controlled reduction in the wall thickness and/or external diameters of such workpieces.
  • a further object of the invention is to provide a novel and improved apparatus for cold-drawing of metallic tubes which allows for controlled reduction-of external diameters and wall thicknesses of metallic tubes and which does not necessitate any auxiliary treatment of tubes between successive cold-drawing operations.
  • An additional object of the invention is to provide the cold-drawing apparatus with novel and improved means for moving metallic tubes lengthwise through a series of successive reducing dies.
  • Still another object of the invention is to provide an apparatus for economical cold-drawing of metallic tubes which can be utilized to effect a substantial reduction in the diameters and/or wall thicknesses of metallic tubes.
  • Another object of the invention is to provide an improved multi-stage cold-drawing apparatus for seamless or welded metallic tubes.
  • the method of the present invention is utilized for cold-drawing of metallic tubes in a plurality of successive passes while a tube travels within a series of longitudinally spaced diameter-reducing surfaces each of which surrounds a space whose cross-sectional area exceeds the cross-sectional area of the space surrounded by the next-following surface.
  • the method comprises the steps of subjecting the tube to be cold-drawn to the action of discrete pulling forces acting on the tube downstream of the reducing surfaces so that the tube advances lengthwise through successive spaces, and regulating the magnitude of such forces so as to subject the tube to oppositely directed variable tensional stresses acting on the tube upstream and downstream of each reducing surface whereby the tensional stresses which act on the tube upstream of the reducing surfaces reduce the resistance which the tube offers to a reduction of its diameter during travel through the respective spaces.
  • the method may further comprise the step of subjecting the tube to the action of at least one wallthickness reducing surface which is spacedly surrounded by one of the diameter-reducing surfaces.
  • the diameter-reducing surfaces are the internal surfaces of discretereducing dies and the wall-thickness reducing surface or surfaces are the external surfaces of mandrels which are inserted into the tube in the region of one or more dies.
  • FIG. 1 is a schematic side elevational view of a multipass cold-drawing apparatus which embodies the invention'
  • FIG. 2 is a schematic plan view of the cold-drawing apparatus
  • FIG. 3 is an enlarged longitudinal vertical sectional view of a draw bench and of a tube advancing unit in the apparatus of FIGS. 1 and 2;
  • FIG. 4 is an enlarged sectional yiew of three successive reducing dies in the apparatus of FIGS. 1 and 2;
  • FIG. 5 is an enlarged partly longitudinal vertical sectional view of a detail in the apparatus of FIGS. 1 and 2.
  • FIGS. 1 and 2 there is shown a cold-drawing apparatus which includes a reel 1 storing a'supply of convoluted steel tape or band 4a and a tube forming unit 2 which converts the band 4a into a continuous tube 4b.
  • a tube is thereupon caused to pass through a welding unit 3 to be converted into a welded tube 4 which is ready to enter the first of a series of four successive draw benches I05, 105a, 1051), 105C.
  • the welding unit 3 provides the tube 4 with an axially parallel welded seam, not shown.
  • Each of the draw benches 105-1050 is assembled with one of four advancing devices 5, 5a, 5b, 50 to form therewith a compact combined cold-drawing and advancing or pulling unit.
  • the reference character 6 denotes a conventional calibrating device for cold-drawn tubes, and such calibrating device is followed by collecting or winding devices 7, 70 for calibrated tubes.
  • Each of the advancing devices 5, 541,517, 50 comprises a rotary wheel or drum 9 having a cylindrical external surface 9a (FIG. 3) around which the tube 4 forms at least one convolution, and a discrete variable-speed electric motor 109 (FIG. 2) which drives the respective wheel 9 at a selected speed through the intermediary of asuitable transmission 209.
  • FIGS. 1 and 2 further show that the wheels 9 of the advancing devices 5, 5a are angularly offset relative to each other by 180, as considered in the circumferential direction of the path for the tube 4.
  • the relative positions of wheels 9 in the advancing devices 517, Sc are similar but the plane of the wheels 9 in the devices 512,
  • coldd'rawing and advancing unit which includes the draw bench 105k and the next-following advancing device 5b.
  • This unit comprises a single base 205 which supports all components of the draw bench 105k and all components of the advancing device 5b.
  • the draw bench [05b comprises a reducing die 8 which is fixedly but removably mounted in a holder 15 and abuts against a flange at the forward end of a lubricantconfining sleeve 16.
  • a nut 18 meshes with, the holder 15, as at 17, to prevent axial movement of the die 8 and/or sleeve 16.
  • the inlet for admission of lubricant into a tubular confining space between the external surface of the welded tube 4 and the forwardly tapering conical internal surface of the sleeve 16 is shown at 19.
  • the purpose of the confining sleeve 16 is described in our copending application Ser. No. 265,970 filed June 26, 1972 and owned by the assignee of the present application.
  • the holder 15 is mounted in a frame 10 which is pivotable about a horizontal pin 11. The latter extends at right angles to the path of the tube 4 and across the space between the prongs of the bifurcated upper end portion of a vertical shaft 13 which is rotatable in a bearing sleeve 12 of the base 205.
  • the shaft 13 is movable up and down by an adjusting device 13a, e.g., a feed screw. It will be seen that the parts 11 and 13 allow for movement of the die 8 in a plurality of directions so that the axis of the die coincides with the axis of the tube 4 when the latter is moved lengthwise in response to rotation of the wheel or drum 9 in the advancing device 5b.
  • a roller 14 at the lower front end of the frame 10 abuts against a platform at the top of the base 205 to reduce friction when the frame 10 is caused to turn about the axis of the shaft 13. It will be seen that the portion of the tube 4 shown in FIG. 3 forms a single convolution around the surface 9a of the wheel 9.
  • the construction of the other three combined cold-drawing and advancing units is preferably identical with that of the unit shown in FIG. 3.
  • the draw benches 105, 1050, 105b further respectively comprise floating mandrels 20, 20a, 20b which respectively cooperate with the dies 8, 8a, 8b to reduce the wall thickness of the tube 4 simultaneously with a reduction in external and internal diameters of the tube.
  • the mandrels 20, 20a, 20b are respectively provided with rearwardly extending confining members 120, a, 12% which define with surrounding portions of the internal surface of the tube 4 a series of forwardly tapering tubular confining spaces for pressurized lubricant.
  • the space around the confining member 120 receives pressurized lubricant from a supply pipe 21.
  • a conduit 22 delivers pressurized lubricant to an axial bore 23 extending through the parts 20, 120 whereby such lubricant fills the confining space around the member 1200.
  • An axial bore 230 of the member 120a and mandrel 20a admits pressurized lubricant intothe space surrounding the confining member 1201).
  • the conduit 22 and supply pipe 21 are introduced into the interior of the tube 4 at the station accommodating the tube forming unit 2 or welding unit 3 of FIGS. 1 and 2.
  • the purpose of the lubricant which is fed by way of the pipe 21 and conduit 22 is disclosed in our aforementioned copending application Ser. No. 265,970 to which reference may be had if necessary.
  • Such lubricant insures that the tube 4 remains separated from the mandrels 20-20b and confining members 120-120b by continuous films of lubricant whose pressure preferably exceeds 600 atmospheres and may rise to 3,000 atmospheres superatmospheric pressure.
  • FIG. 5 there are shown two successive advancing devices (e.g., 5 and 5a) and the draw bench (105a) therebetween.
  • the speed of the motors 109 which drive the wheels 9 of the advancing devices 5 and 5a is regulated by a control circuit including a gauge 24 having a dancer roll 24a which rides on the tube 4 upstream of the die 8a.
  • the tension of the tube 4 is selected in such a way that the tube portion 43 downstream of the die 8a is pulled forwardly by the device 5a and that the tube portion 4A upstream of the die 8a is pulled rearwardly by the advancing device 5.
  • the tube 4 is subjected to oppositely directed tensional stresses upstream and downstream of the die 8a whereby the tensional stresses which are produced by the device 5 reduce the resistance which the tube portion 4A offers to a reduction of its diameter and wall thickness during travel through the die 8a.
  • the gauge 24 furnishes signals whose intensity is proportional to tensional stressing of the tube portion 4A whereby the control circuit which includes the gauge 24 changes the speed of the motor 109 for the wheel 9 in the advancing device 5a and/or 5 when the magnitude of the detected tensional stress deviates from a desired value.
  • the exact construction of the regulating means including the circuit which receives signals from the gauge 24 and controls the speed of the motors 109 forms no part of the present invention.
  • the tensional stressing of tube portions 4A upstream of each of the dies is preferably maintained within a desired range.
  • the arrangement is such that the forces acting upon the tube 4 counter to the direction of its movement through the dies are balanced by the forces which must be applied to deform the tube during passage through the dies.
  • the determining factor is the magnitude of tensional stresses which are measured by the gauges 24 and are regulated in response to signals from the gauges to remain at an optimum value.
  • tensional stresses oppose the pulling forces furnished by the advancing devices 5, 5a, 5b, 5c downstream of the respective dies.
  • the pulling forces are selected by the regulating means automatically as a function of tensional stresses acting on the tube upstream of the dies and as a function of the magnitude of necessary deforming forces which are needed to effect the reduction in diameter and/or wall thickness during travel through the dies.
  • FIG. 5 shows the wheels 9 of the advancing devices 5 and 5a at the same side of the path for the tube 4.
  • the apparatus is assumed to comprise four draw benches and four advancing units. Each draw bench includes a die and a floating mandrel. Such apparatus allows for a reduction in the cross-section of a metallic tube by 82.3% Thus, and assuming that the outer diameter of a freshly welded tube 4 is l5 millimeters and that the wall thickness of such tube is 1.15 millimeters, the wall thickness and outer diameter can be respectively reduced to l and 4 millimeters.
  • the speed of the motor 109 in each next-following advancing device 5a, 5b, Sc exceeds the speed of the motor 109 in the respective preceding advancing device 5, 5a, 5b. This compensates for automatic elongation of the tube 4 during cold-drawing.
  • the speed of the motors 109 is regulated with a view to subjecting the tube 4 to desirable tensional stresses upstream of each reducing die. These tensional stresses reduce the resistance of the material of the tube to deformation during passage between the dies and the associated mandrels. Such mode of operation allows for a substantial reduction of the cross section of tubular workpieces in a relatively small number of passes.
  • the reduction of cross section is much greater than in rolling mills; as indicated in the preceding table, such reduction may be in the range of 30-50 percent per die whereas the reduction per stand of a rolling mill normally approximates 5 percent.
  • the dies exert a beneficial influence on the material of the tubes and render it possible to reduce the dimensions of tubes in an accurately reproducible manner, i.e., within very close tolerances.
  • the apparatus of the present invention does not cause a one-sided reduction of diameter and/or wall thickness, even when the dies and the mandrels are called upon to effect a very substantial reduction in the crosssectional area of a tubular workpiece. This constitutes another important advantage over the rolling mills.
  • the advancing devices 5, 5a, 5b, 5c constitute but one form of means for moving the tubular workpieces lengthwise through a series of reducing dies.
  • advancing devices can be replaced with worms, plyers or the like.
  • illustrated advancing devices exhibit a number of important advantages.
  • the angular spacing of wheels 9 as shown in FIGS. 1 and 2 reduces the likelihood of unequal distribution of material in the tubular workpieces and/0r peripheral incrustation of certain strands of the metallic material.
  • apparatus and method of the present invention can be resorted to for the colddrawing of continuous or finite lengths of seamless metallic tubes.
  • successive tubes are preferably connected to each other end-toend by means of plugs or the like.
  • said regulating means includes at least one gauge arranged to measure the tension of the tube.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
US00265969A 1971-06-26 1972-06-26 Multi-pass method and apparatus for cold-drawing of metallic tubes Expired - Lifetime US3812702A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2131874A DE2131874C3 (de) 1971-06-26 1971-06-26 Vorrichtung zum Reduzieren von Rohrsträngen

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US (1) US3812702A (it)
JP (1) JPS52466B1 (it)
AR (1) AR193880A1 (it)
AT (1) AT329493B (it)
BE (1) BE785272A (it)
BR (1) BR7204122D0 (it)
CA (1) CA954070A (it)
CH (1) CH554715A (it)
DE (1) DE2131874C3 (it)
DK (1) DK154124C (it)
ES (2) ES403299A1 (it)
FR (1) FR2143725B1 (it)
GB (1) GB1384142A (it)
IT (1) IT965826B (it)
LU (1) LU65584A1 (it)
NL (1) NL169146C (it)
SE (2) SE405452B (it)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4092875A (en) * 1976-02-20 1978-06-06 Marshall Richards Barcro Limited Tube drawing method and apparatus
DE2738559A1 (de) * 1977-08-24 1979-03-01 Mannesmann Ag Verfahren zum ziehen von rohren mit innenabstuetzung
US4573336A (en) * 1984-05-30 1986-03-04 Erik Hagglund Method and apparatus for wire drawing
US4734981A (en) * 1986-04-16 1988-04-05 Kabelmetal Electro Gmbh Method and apparatus for manufacturing hollow tubular members
US4750344A (en) * 1985-11-01 1988-06-14 Ceeco Machinery Manufacturing Limited Wire drawing apparatus and method
US4857247A (en) * 1986-08-18 1989-08-15 Technicon Instruments Corporation Method for drawing thermoplastic tubing
WO1989012514A1 (en) * 1985-11-01 1989-12-28 Syncro Machine Co. Wire drawing apparatus and method
US4961576A (en) * 1988-11-23 1990-10-09 Sandvik Special Metals Corporation Constant wall shaft with reinforced tip
US4962658A (en) * 1988-08-03 1990-10-16 Firma Schumag AG Method and apparatus for straight drawing a pipe
US5074555A (en) * 1989-04-24 1991-12-24 Sandvik Special Metals Corp. Tapered wall shaft with reinforced tip
US5246752A (en) * 1986-08-18 1993-09-21 Technicon Instruments Corporation Method and apparatus for drawing thermoplastic tubing
US5533376A (en) * 1993-08-20 1996-07-09 Schumag Ag Method for preparing a tubular blank having a thick wall for a following cascade drawing operation
US6018975A (en) * 1997-09-26 2000-02-01 Frigerio; Marco Multipass wiredrawing machine with wire tension control device
US6164112A (en) * 1997-11-11 2000-12-26 Frigerio; Marco Adjustment and tension control device for a multipass wire drawing machine
US6682610B1 (en) * 1999-02-15 2004-01-27 Nhk Spring Co., Ltd. Manufacturing method for hollow stabilizer
US20070240478A1 (en) * 2006-04-12 2007-10-18 Martin Kalweit Wire-drawing apparatus
CN102240686A (zh) * 2011-04-29 2011-11-16 祁阳宏泰铝业有限公司 一种有色金属管材自动冷拉新工艺及其自动冷拉机

Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
DE2558671C2 (de) * 1975-12-24 1985-10-24 Benteler-Werke Ag, 4794 Schloss Neuhaus Kaltziehvorrichtung zum Reduzieren von Rohren
DE2829058C2 (de) * 1978-07-01 1984-03-22 Benteler-Werke Ag Werk Neuhaus, 4790 Paderborn Verfahren und Vorrichtung zum Abziehen eines zu einem Rohrbund aufgewickelten Stahlrohrs für die Zwecke seiner Weiterverarbeitung am geraden Rohrstrang
IT1101198B (it) * 1978-12-20 1985-09-28 Kliko International Ag Macchina di trafilatura multipla di fili metallici,con controllo del tiro fra le bobine
DE3050428C2 (de) * 1980-05-30 1986-05-15 Gni Skij I Pi Splzvov I Obrabo Verfahren zur Herstellung von Messingrohren
DE3401075A1 (de) * 1984-01-13 1985-07-25 Gosudarstvennyj naučno-issledovatel'skij proektnyj i konstruktorskij institut splavov i obrabotki cvetnych metallov "Giprocvetmetobrabotka", Moskau/Moskva Verfahren zum ziehen von erzeugnissen mit gegenzug und ziehmaschine zur durchfuehrung desselben
GB9115063D0 (en) * 1991-02-01 1991-08-28 North West Water Ltd Improvements in or relating to pipe handling
DE4412268A1 (de) * 1994-04-09 1995-10-12 Herborn & Breitenbach Verfahren zum selbständigen bzw. automatischen Betrieb einer Steuerungs- und Regelungseinrichtung für die Ziehantriebe einer im direkten gleitlosen Ziehverfahren arbeitenden Mehrfachziehmaschine
EP2368648A1 (de) 2010-03-26 2011-09-28 BL Chemie GmbH & Co. KG Verfahren zum Umformen von Stangen, Profilen und/oder Rohren mit einer Ziehkraft und einer Gegenkraft

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2138126A (en) * 1935-06-03 1938-11-29 Frank H Smith Method of and apparatus for drawing wire
US2138201A (en) * 1937-02-06 1938-11-29 Anaconda Wire & Cable Co Wire drawing method and apparatus
US2155437A (en) * 1937-10-12 1939-04-25 Aluminum Co Of America Tube drawing method
US2250886A (en) * 1939-12-08 1941-07-29 Morgan Construction Co Wire-drawing machine
US2355734A (en) * 1943-05-06 1944-08-15 Bundy Tubing Co Floating pin mandrel
US3526115A (en) * 1966-09-28 1970-09-01 British Iron Steel Research Drawing of materials through reducing dies
US3590622A (en) * 1968-12-18 1971-07-06 Ernest N Calhoun Apparatus for making tubing
US3668916A (en) * 1970-01-19 1972-06-13 Wean Ind Inc Drawing of metal tubing
US3765215A (en) * 1972-01-21 1973-10-16 Aluminum Co Of America Tube drawing method and apparatus

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Publication number Priority date Publication date Assignee Title
DE438275C (de) * 1924-08-31 1926-12-15 Bruno Weissenberg Dipl Ing Verfahren zum Ziehen von Stangen und Draehten
GB701137A (en) * 1951-02-12 1953-12-16 Calumet And Hecla Cons Copper Metal stock drawing apparatus
US3542307A (en) * 1968-10-22 1970-11-24 Blaw Knox Co Receiving tray for strand material

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2138126A (en) * 1935-06-03 1938-11-29 Frank H Smith Method of and apparatus for drawing wire
US2138201A (en) * 1937-02-06 1938-11-29 Anaconda Wire & Cable Co Wire drawing method and apparatus
US2155437A (en) * 1937-10-12 1939-04-25 Aluminum Co Of America Tube drawing method
US2250886A (en) * 1939-12-08 1941-07-29 Morgan Construction Co Wire-drawing machine
US2355734A (en) * 1943-05-06 1944-08-15 Bundy Tubing Co Floating pin mandrel
US3526115A (en) * 1966-09-28 1970-09-01 British Iron Steel Research Drawing of materials through reducing dies
US3590622A (en) * 1968-12-18 1971-07-06 Ernest N Calhoun Apparatus for making tubing
US3668916A (en) * 1970-01-19 1972-06-13 Wean Ind Inc Drawing of metal tubing
US3765215A (en) * 1972-01-21 1973-10-16 Aluminum Co Of America Tube drawing method and apparatus

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4092875A (en) * 1976-02-20 1978-06-06 Marshall Richards Barcro Limited Tube drawing method and apparatus
DE2738559A1 (de) * 1977-08-24 1979-03-01 Mannesmann Ag Verfahren zum ziehen von rohren mit innenabstuetzung
US4573336A (en) * 1984-05-30 1986-03-04 Erik Hagglund Method and apparatus for wire drawing
US4750344A (en) * 1985-11-01 1988-06-14 Ceeco Machinery Manufacturing Limited Wire drawing apparatus and method
WO1989012514A1 (en) * 1985-11-01 1989-12-28 Syncro Machine Co. Wire drawing apparatus and method
US4734981A (en) * 1986-04-16 1988-04-05 Kabelmetal Electro Gmbh Method and apparatus for manufacturing hollow tubular members
US4857247A (en) * 1986-08-18 1989-08-15 Technicon Instruments Corporation Method for drawing thermoplastic tubing
US5246752A (en) * 1986-08-18 1993-09-21 Technicon Instruments Corporation Method and apparatus for drawing thermoplastic tubing
US4962658A (en) * 1988-08-03 1990-10-16 Firma Schumag AG Method and apparatus for straight drawing a pipe
US4961576A (en) * 1988-11-23 1990-10-09 Sandvik Special Metals Corporation Constant wall shaft with reinforced tip
US5074555A (en) * 1989-04-24 1991-12-24 Sandvik Special Metals Corp. Tapered wall shaft with reinforced tip
US5533376A (en) * 1993-08-20 1996-07-09 Schumag Ag Method for preparing a tubular blank having a thick wall for a following cascade drawing operation
US6018975A (en) * 1997-09-26 2000-02-01 Frigerio; Marco Multipass wiredrawing machine with wire tension control device
US6164112A (en) * 1997-11-11 2000-12-26 Frigerio; Marco Adjustment and tension control device for a multipass wire drawing machine
US6682610B1 (en) * 1999-02-15 2004-01-27 Nhk Spring Co., Ltd. Manufacturing method for hollow stabilizer
US20070240478A1 (en) * 2006-04-12 2007-10-18 Martin Kalweit Wire-drawing apparatus
CN102240686A (zh) * 2011-04-29 2011-11-16 祁阳宏泰铝业有限公司 一种有色金属管材自动冷拉新工艺及其自动冷拉机
CN102240686B (zh) * 2011-04-29 2013-03-27 祁阳宏泰铝业有限公司 一种有色金属管材自动冷拉工艺

Also Published As

Publication number Publication date
LU65584A1 (it) 1972-10-25
CA954070A (en) 1974-09-03
SE405452B (sv) 1978-12-11
JPS52466B1 (it) 1977-01-07
BE785272A (fr) 1972-12-22
AR193880A1 (es) 1973-05-31
NL169146C (nl) 1982-06-16
CH554715A (de) 1974-10-15
IT965826B (it) 1974-02-11
FR2143725A1 (it) 1973-02-09
SE430764B (sv) 1983-12-12
ES403299A1 (es) 1975-12-16
BR7204122D0 (pt) 1974-10-22
NL169146B (nl) 1982-01-18
GB1384142A (en) 1975-02-19
DE2131874B2 (de) 1978-10-05
AT329493B (de) 1976-05-10
DE2131874C3 (de) 1984-07-19
DK154124B (da) 1988-10-17
NL7208679A (it) 1972-12-28
DE2131874A1 (de) 1973-01-11
ATA385772A (de) 1975-08-15
FR2143725B1 (it) 1975-04-25
ES430779A1 (es) 1976-10-16
DK154124C (da) 1989-03-13

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