EP0433767B1 - Continuous drawing method for straight drawing operations and device that employs the method - Google Patents

Continuous drawing method for straight drawing operations and device that employs the method Download PDF

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Publication number
EP0433767B1
EP0433767B1 EP90123300A EP90123300A EP0433767B1 EP 0433767 B1 EP0433767 B1 EP 0433767B1 EP 90123300 A EP90123300 A EP 90123300A EP 90123300 A EP90123300 A EP 90123300A EP 0433767 B1 EP0433767 B1 EP 0433767B1
Authority
EP
European Patent Office
Prior art keywords
movable
tracked
distance
chain
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90123300A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0433767A1 (en
Inventor
Paolo Moras
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DANIELI NATISONE SpA
Danieli and C Officine Meccaniche SpA
Original Assignee
DANIELI NATISONE SpA
Danieli and C Officine Meccaniche SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DANIELI NATISONE SpA, Danieli and C Officine Meccaniche SpA filed Critical DANIELI NATISONE SpA
Publication of EP0433767A1 publication Critical patent/EP0433767A1/en
Application granted granted Critical
Publication of EP0433767B1 publication Critical patent/EP0433767B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B21C1/27—Carriages; Drives
    • B21C1/30—Drives, e.g. carriage-traversing mechanisms; Driving elements, e.g. drawing chains; Controlling the drive

Definitions

  • This invention concerns a continuous drawing device for straight drawing.
  • the invention concerns a device whereby the means supporting the drawing clamps and carrying out re-circulation of those clamps in the drawing zone provide for adjustment of the distance between their centres in a plurality of steps separate from each other.
  • the state of the art covers a plurality of continuous drawing methods and devices for straight drawing operations.
  • Drawbenches which employ trolleys moving to-and-fro in the drawing direction; it is well known that these trolleys are troubled by dynamic problems since it is necessary to invert their motion regularly at each engagement and release of the material drawn by the clamps with which the trolleys are fitted. This gives rise to considerable stresses on the moving parts and to problems of guiding and controlling the moving parts. Moreover, the greatest drawback of these embodiments lies in their inability to reach high speeds.
  • clamps are positioned facing each other and parallel along a straight segment and are borne on a pair of tracked means or chains.
  • One type of known embodiment arranges that the clamps are borne and moved on the respective tracked means or chains and are secured thereto.
  • Another type of known embodiment provides for the tracked means or chains to be merely the means that support and recirculate the clamps; the drawing of the clamps performing the drawing operation is carried out by appropriate drawing means, such as threaded means, separate from the chains or tracked means.
  • These known embodiments include means to adjust mechanically the distance between centres of the tracks so as to adapt that distance to the various drawing diameters.
  • the drawing axis remains constantly the same, while both the tracked means are displaced crosswise to the drawing axis to adjust the distance between centres of the tracks according to the changes in diameter of the drawn product to be obtained.
  • US-A-2,797,798 discloses a rod feeding device with tracks and with the pressure on the stock to be drawn produced by wedge-type positioning means, which serve to align the feed runs with the aperture of the die through which the stock is drawn, and by a plurality of jacks, all of which too act directly on the tracks.
  • This embodiment employs a combined hydraulic/mechanical system to obtain the positioning and compression action.
  • the positioning system includes also a pair of eccentric bushes which act on two motive shafts.
  • the invention provides for the employment of known means in the drawing operation, the means including chains or tracks to support and draw the drawing clamps.
  • the action of adjusting the distance between centres of the chains or tracks and the final clamping of the clamps on the material being drawn take place in at least two steps with different methods.
  • the first step is the approach of the chains or tracks to the drawing axis in a known manner by means of substantially mechanical operational means.
  • one of the two chains or tracks reaches advantageously the final position it will occupy during the drawing operation, whereas the other chain or track is halted in a position near the drawing line but distanced therefrom by a required value.
  • the second chain or track is brought into cooperation with the first chain or track by a displacement caused by actuation by means of a fluid.
  • Both the chains or tracks may also be positioned at a distance from the drawing axis and then be displaced finally by actuation by means of a fluid, but this solution is more complex from a constructional and operational point of view.
  • a continuous drawing device 10 which is substantially known in itself is positioned downstream of a drawbench 11.
  • the device 10 comprises two drawing chains 12-112 located on the same plane in the neighbourhood of a drawing axis 13.
  • the two chains 12-112 may lie on the same horizontal, vertical or inclined plane, depending on the choice of the design work.
  • each chain 12-112 is wound on their respective sprockets 14; each chain comprises an opposed straight segment on the drawing axis 13.
  • Each chain 12-112 bears its respective halves of drawing clamps 15-115, which cooperate in forming complete clamps on the drawing axis 13.
  • Both the first halves 15 and the second halves 115 of the clamps are connected to their respective chains 12-112 by suitable connection means 16.
  • the device 10 is equipped with means to adjust the distance between centres of the chains 12-112.
  • the adjustment of the distance between centres is required in the initial drawing step when it is necessary to be able to apply great displacements to the clamps 15-115 at a right angle to the drawing axis 13 so as to enable the operations of introduction and gripping of the material to be drawn to be carried out.
  • This adjustment of the distance between centres in a direction at a right angle to the drawing axis 13 is of a modest value but is also required to adapt the chains 12-112 to the variations in the diameters to be drawn.
  • the means for adjustment of the distance between centres comprise a motor 17 of a suitable type that actuates a pair of threaded shafts 19 through transmissions 19.
  • Each threaded shaft 19 comprises two threaded segments 20-120, one having a righthand thread and the other a lefthand thread, which cooperate with their own nut screw assemblies 21-121 (see Fig.2). These nut screw assemblies 21-121 cooperate with sleeve assemblies 22-122 connected to the respective chains 12-112.
  • the sleeve assemblies 22-122 can slide in relation to the coordinated nut screw assemblies 21-121 and, when thrust by the latter 21-121 during rotation of the threaded shafts 19, are displaced.
  • one chain 12 is brought, by means of the sleeve assembly 22 connected thereto, to a position orthogonally in relation to the drawing axis 13 by the motor 17; this position is the final one to be taken up by that chain 12 according to the pre-selected diameter to be drawn.
  • the other chain 112 is brought at the same time by the other sleeve assembly 122 connected thereto in the opposite direction to that of the first chain 12 to a required position in relation to the drawing axis 13, but this position is not the final position and is distant by a required value from the drawing axis 13.
  • the final position of the second chain 112 namely the position for clamping between the two chains 12-112 the material to be drawn, is reached with a supplementary travel of the second sleeve assembly 122.
  • This supplementary travel is obtained by the injection of fluid under pressure into a chamber 23 positioned between the second nut screw assembly 121 and the second sleeve assembly 122.
  • the fluid under pressure causes the second sleeve assembly 122 to slide in relation to the second nut screw assembly 121 and the second chain 112 to be displaced downwards by a value which corresponds to the play 24 in the embodiment of Fig.2.
  • Means 25 and 125 are included to eliminate the mechanical play proper to the system and, in particular, the play in the threaded segments 20-120 and nut screw assemblies 21-121.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
  • Forging (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Preparing Plates And Mask In Photomechanical Process (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
EP90123300A 1989-12-19 1990-12-05 Continuous drawing method for straight drawing operations and device that employs the method Expired - Lifetime EP0433767B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8354189 1989-12-19
IT08354189A IT1236458B (it) 1989-12-19 1989-12-19 Procedimento di tiro continuo per trafilatura rettilinea e dispositivo adottante tale procedimento.

Publications (2)

Publication Number Publication Date
EP0433767A1 EP0433767A1 (en) 1991-06-26
EP0433767B1 true EP0433767B1 (en) 1994-09-28

Family

ID=11322892

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90123300A Expired - Lifetime EP0433767B1 (en) 1989-12-19 1990-12-05 Continuous drawing method for straight drawing operations and device that employs the method

Country Status (5)

Country Link
EP (1) EP0433767B1 (it)
AT (1) ATE112189T1 (it)
DE (1) DE69012966T2 (it)
ES (1) ES2063885T3 (it)
IT (1) IT1236458B (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19708709C1 (de) * 1997-02-24 1998-03-12 Mannesmann Ag Antrieb für eine kontinuierliche Ziehvorrichtung zum Geradeausziehen von Rohren oder Stangen
DE19727699A1 (de) * 1997-06-23 1998-12-24 Mannesmann Ag Ketteneinlauf an Raupenketten-Ziehmaschinen
DE19936742A1 (de) * 1999-08-07 2001-02-08 Schumag Ag Antrieb für ein Kettenrad, insbesondere einer Kettenziehvorrichtung
RU2210444C2 (ru) * 1996-12-17 2003-08-20 Маннесманн Акциенгезелльшафт Способ холодного пильгерования труб

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2111225T3 (es) * 1993-09-29 1998-03-01 Danieli Off Mecc Maquina para estirar varillas.
DE102004023237A1 (de) * 2004-03-28 2005-11-17 Schumag Ag Ziehmaschine und Verfahren zum Ziehen eines Ziehgutes
CN105665457B (zh) * 2016-02-29 2018-01-23 镇江永沃铜业有限公司 一种铜棒拉丝机
CN105537299B (zh) * 2016-02-29 2017-11-07 镇江永沃铜业有限公司 一种自动循坏式铜棒拉丝机
CN105537300B (zh) * 2016-02-29 2017-11-14 镇江永沃铜业有限公司 一种用于铜棒的自动拉丝装置
CN109877382A (zh) * 2019-03-22 2019-06-14 张智林 双向连续金属杆拉光机
CN111570546B (zh) * 2020-06-02 2025-03-25 烟台孚信达双金属股份有限公司 铜铝复合排履带拉拔模具可移动装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642280A (en) * 1945-10-25 1953-06-16 Gustaf L Fisk Apparatus for cold reducing metal bars
US2797798A (en) * 1952-07-07 1957-07-02 Hallden Machine Company Tractor-type stock feed

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2210444C2 (ru) * 1996-12-17 2003-08-20 Маннесманн Акциенгезелльшафт Способ холодного пильгерования труб
DE19708709C1 (de) * 1997-02-24 1998-03-12 Mannesmann Ag Antrieb für eine kontinuierliche Ziehvorrichtung zum Geradeausziehen von Rohren oder Stangen
DE19727699A1 (de) * 1997-06-23 1998-12-24 Mannesmann Ag Ketteneinlauf an Raupenketten-Ziehmaschinen
DE19936742A1 (de) * 1999-08-07 2001-02-08 Schumag Ag Antrieb für ein Kettenrad, insbesondere einer Kettenziehvorrichtung

Also Published As

Publication number Publication date
IT8983541A0 (it) 1989-12-19
ATE112189T1 (de) 1994-10-15
DE69012966T2 (de) 1995-02-02
IT8983541A1 (it) 1991-06-19
EP0433767A1 (en) 1991-06-26
DE69012966D1 (de) 1994-11-03
ES2063885T3 (es) 1995-01-16
IT1236458B (it) 1993-03-09

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