EP0288086A2 - Dispositif d'emboutissage de barres par retournement de l'ebauche et procédé pour cela - Google Patents

Dispositif d'emboutissage de barres par retournement de l'ebauche et procédé pour cela Download PDF

Info

Publication number
EP0288086A2
EP0288086A2 EP88106539A EP88106539A EP0288086A2 EP 0288086 A2 EP0288086 A2 EP 0288086A2 EP 88106539 A EP88106539 A EP 88106539A EP 88106539 A EP88106539 A EP 88106539A EP 0288086 A2 EP0288086 A2 EP 0288086A2
Authority
EP
European Patent Office
Prior art keywords
die plate
bar
gripper
segment
reverse
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.)
Withdrawn
Application number
EP88106539A
Other languages
German (de)
English (en)
Other versions
EP0288086A3 (fr
Inventor
Gianluigi Buglioni
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 EP0288086A2 publication Critical patent/EP0288086A2/fr
Publication of EP0288086A3 publication Critical patent/EP0288086A3/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • 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
    • B21C5/00—Pointing; Push-pointing
    • 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
    • B21C5/00—Pointing; Push-pointing
    • B21C5/006—Pointing; Push-pointing of solid material, e.g. wire or profiles

Definitions

  • This invention concerns a device to prepare for the drawing of bars and tubes and also for reverse drawing in a machine that draws bars or tubes.
  • the invention has the purpose of creating an initial drawing of a bar along a long enough segment with drawing characteristics substantially like the remainder of the bar.
  • the invention provides also the relative method.
  • the preparation of the initial segment of bars to be drawn and processed in drawing machines is carried out by means of an auxiliary operation performed with a pointing machine which prepares a first initial segment.
  • This initial segment of the bar is threaded into a die and the bar is pushed through the die until the required length of pre-drawn bar has been obtained.
  • This length is determined by the position of the first drawing vice in relation to the drawbench, the drawing vice being located immediately down­stream of the drawbench.
  • the force required by this thrust action has an effect on the installed power and the structure of the machine and, more generally, on the quality of the finished product obtained.
  • Such systems entail the drawback of requiring too long a travel of the draw carriage so that the vices work on the whole bar, so as not to damage the bar and vices and so as to obtain a sufficient engagement of the bar.
  • the embodiment according to the invention enables a machine to be used having a lower required power for the initial phase, given equal performances of the machines.
  • a bar which may be solid or hollow, undergoes a first preparation step according to the traditional method, but this initial preparation covers a shorter segment of bar.
  • the initial segment of the bar is then threaded into the die plate and clamped at its pointed portion immediately downstream of the die plate. This clamping is performed firmly.
  • the die plate with its relative bearing structure is made to retreat and at the same time to perform the reverse drawing until it has reached the required position of retreat, which coincides with the required initial length of reverse drawing.
  • the bar together with the die plate is made to advance until the die plate has reached its normal drawing position.
  • the reverse drawing action is carried out along a segment of bar long enough to obtain a sufficiently long drawn segment of bar so that, when the die plate with the bar positioned therein and with the drawn segment protruding reaches again its normal drawing position, the drawn segment can be secured firmly to the drawing vice of the first draw carriage.
  • This method enables a perfectly drawn initial segment of bar to be obtained which possesses the same characteristics as those to be found in the remainder of the bar when the latter is drawn normally.
  • This system does not create abnormalities and, at the same time, enables processing of a high quality to be obtained in very limited times.
  • the invention is therefore obtained with a method for the reverse drawing of bars so as to obtain a first segment of drawn bar long enough for anchorage to a draw carriage, the method being characterized in that it includes the following steps: - a pointed segment is created on the bar, - this pointed segment is threaded through a die plate and clamped by a first gripper secured to a base of a drawbench, - the die plate is moved backwards, thus drawing a required length with the bar stationary, - the bar is then released from the first gripper and is moved forwards together with the die plate until the die plates reaches a starting position coinciding with the normal drawing position, and at least part of the segment thus reverse drawn cooperates firmly with the first draw carriage.
  • the invention is also embodied with a device for the reverse drawing of bars which is suitable to obtain the above method and is characterized in that it comprises in cooperat­ion: - a die plate able to move axially from a normal drawing position to an end position of reverse drawing at a required distance, - a first gripper solidly fixed to a base and positioned immediately downstream of a die plate, - a possible second gripper for advancing the bar during the step of repositioning the die plate.
  • the figure shows a substantially horizontal and lengthwise section of a preferred embodiment of the invention.
  • the example shown in figure comprises a device 10 according to the invention with a die plate 13 cooperating with a draw carriage 31.
  • the die plate 13 and draw carriage 31 are known and are noted here so as to describe and introduce the invention itself.
  • the die plate itself can be fitted so as to be stationary or able to oscillate, as in the case, a die-holder support 17 cooperating with a bearing 18 which enables the die plate to oscillate by a required amount according to the drawing requirements before fixture of the die plate.
  • the die-holder support 17 cooperates with a lubricating channel 16 able to lubricate the die plate and bar or tube also with a chamber which holds lubricant and is located also upstream of the die plate.
  • a support roll 21 is also of a known type and is noted here for the illustrative reasons mentioned.
  • a pointed segment 12 of a limited length is created on a bar 11 to be drawn. This length must be enough to enable the pointed segment 12 to pass through the die plate 13 and reach a first gripper 14, which is substantially solidly fixed to a base 24 of the machine.
  • first gripper 14 can be actuated by a motor 28 which drives a threaded shaft 29 that acts on a screw thread 30 on the first gripper 14.
  • the first gripper 14 serves to clamp the bar 11 during the whole step of reverse drawing.
  • the device 10 When the pointed segment 12 has been threaded through the die plate 3 and clamped by the first gripper 14, the device 10 according to the invention is ready to work.
  • the reverse drawing action serves to create an initial drawn segment on the bar 11; this initial segment must be suitable to permit the segment thus reverse drawn to reach a draw carriage 31 and be clamped thereon without the loss of segments of material that can otherwise be employed.
  • supports 23 are provided on the base 24 and serve to uphold guides 22.
  • a cylinder 25 that creates expansion chambers 27-127 cooperates with each guide 22.
  • a movable carriage 19 which in this case comprises cross members 20-120 for anchorage purposes is secured to the cylinder 25.
  • the whole die-holder support 17 is installed on the first cross member 20 and, according to the invention, is able to move in relation to the base 24, the die plate 13 being able to move axially along the drawing axis.
  • a second gripper 15 is fitted to the second cross member 120 and is, for example, of a pneumatic type, a support roll 21 able to support the bar 11 being also fitted to the second cross member 120.
  • the bar 11 may consist of a hollow tube or of a solid element, the type of bar used being unimportant for the invention.
  • first and second intakes 34-134 are included on both the guides 22 and are suitable to convey fluid under pressure within the first and second expansion chambers 27-127 respectively.
  • the bar 11 is therefore located in the die plate 13 and is clamped by the first gripper 14 besides being supported on the support roll 21.
  • Fluid under pressure is delivered through a first intake 34 into a second expansion chamber 127 while a first expansion chamber 27 is substantially free to make fluid under pressure flow out through a second intake 134.
  • the bar 11 is then clamped by the second gripper 15 while the first gripper 14 is opened.
  • the die plate 13 has now retreated in the direction 32, while the bar 11 is held by the second gripper 15 and has been released by the first gripper 14.
  • the first intake 34 is then set to discharge, while fluid under pressure enters through the second intake 134 and the first expansion chamber 27 is put under pressure, the movable carriage 18 now tending to move in the drawing direction 33.
  • the movable carriage 19 is now made to advance until the die plate 13 reaches its working position and the movable carriage 19 abuts against the base 24.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
EP88106539A 1987-04-24 1988-04-23 Dispositif d'emboutissage de barres par retournement de l'ebauche et procédé pour cela Withdrawn EP0288086A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8783358A IT1214175B (it) 1987-04-24 1987-04-24 Dispositivo di retrotrafilatura barre e procedimento relativo.
IT8335887 1987-04-24

Publications (2)

Publication Number Publication Date
EP0288086A2 true EP0288086A2 (fr) 1988-10-26
EP0288086A3 EP0288086A3 (fr) 1989-02-08

Family

ID=11320682

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88106539A Withdrawn EP0288086A3 (fr) 1987-04-24 1988-04-23 Dispositif d'emboutissage de barres par retournement de l'ebauche et procédé pour cela

Country Status (2)

Country Link
EP (1) EP0288086A3 (fr)
IT (1) IT1214175B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0596577B2 (fr) † 1992-11-03 2004-03-24 Nedschroef Herentals N.V. Installation pour fabriquer des produits en fil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE901764C (de) * 1943-11-09 1954-01-14 Kammerich Werke Ag Verfahren und Vorrichtung zum Ziehen von Rohren
FR942599A (fr) * 1946-01-11 1949-02-11 Wellman Seaver Rolling Mill Co Perfectionnement au procédé de fabrication des tubes métalliques
DE1752994A1 (de) * 1968-08-17 1971-04-15 Thelemann Rolf Dipl Ing Vorrichtung zur Vermeidung des Ausknickens beim Einstossen von Stangen und Rohren in die Ziehmatrize einer Ziehbank
DE2758137C2 (de) * 1977-12-27 1983-12-08 Hunger, Walter, 8700 Würzburg Einziehmaschine zur Ausformung von Rohrangeln

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0596577B2 (fr) † 1992-11-03 2004-03-24 Nedschroef Herentals N.V. Installation pour fabriquer des produits en fil

Also Published As

Publication number Publication date
EP0288086A3 (fr) 1989-02-08
IT1214175B (it) 1990-01-10
IT8783358A0 (it) 1987-04-24

Similar Documents

Publication Publication Date Title
US4645894A (en) Travelling wire EDM apparatus provided with electrode wire changer
CN103586369A (zh) 一种数控弯线机
US4178788A (en) Adjustable clamp die
CN112404304B (zh) 一种超长螺旋线自动化绕制设备及方法
US4126030A (en) Retractable pressure die
GB1484922A (en) Cutting rings from a tube
EP0288086A2 (fr) Dispositif d'emboutissage de barres par retournement de l'ebauche et procédé pour cela
US4206626A (en) Extrusion press for extruding tubes
EP0433767B1 (fr) Procédé d'étirage continu pour l'étirage droit et dispositif à cet effet
US4475372A (en) Method and means for removing a die, sealing member and residual metal from an indirect extrusion press
US3762196A (en) Pipe bending machine
EP0537496A1 (fr) Méthode pour cintrer des bouts de barres pour la construction civile avec des cintreuses coupantes, et cintreuses coupantes utilisant la méthode
CN220006106U (zh) 一种金属制品衬套加工的内径镗孔机
US11897023B2 (en) Device for producing a metal mesh reinforcement
CN215394017U (zh) 一种汽车紧固件生产用下料装置
DE2838656A1 (de) Kreissaege mit schnittspaltoeffnung
CN223655941U (zh) 一种特种加热灯无芯绕丝机
US4543809A (en) Apparatus for bending thin-walled pipes
CN118273148B (zh) 一种特种预应力钢绞线连续卷制装置及使用方法
CN117508738B (zh) 一种自动扎扎带收紧机构
CN222179960U (zh) 一种穿丝板伸缩机构
CN217620844U (zh) 软管切管机
CN217529404U (zh) 一种紧固件坯料加工切料装置
CN109513816A (zh) 管端加工装置及带管端加工装置的弯管机
JP2587382B2 (ja) 線材のスケール除去装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE ES FR GB GR LI LU NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE ES FR GB GR LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19890209