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EP1699580B1 - Procede et dispositif pour produire un corps creux cylindrique a partir d'une ebauche - Google Patents

Procede et dispositif pour produire un corps creux cylindrique a partir d'une ebauche Download PDF

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Publication number
EP1699580B1
EP1699580B1 EP04802020A EP04802020A EP1699580B1 EP 1699580 B1 EP1699580 B1 EP 1699580B1 EP 04802020 A EP04802020 A EP 04802020A EP 04802020 A EP04802020 A EP 04802020A EP 1699580 B1 EP1699580 B1 EP 1699580B1
Authority
EP
European Patent Office
Prior art keywords
workpiece
piercer
forging
pressing cylinder
chuck
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
EP04802020A
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German (de)
English (en)
Other versions
EP1699580A1 (fr
Inventor
Robert Koppensteiner
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.)
GFM Beteiligungs und Management GmbH and Co KG
Original Assignee
GFM Beteiligungs und Management GmbH and Co KG
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 GFM Beteiligungs und Management GmbH and Co KG filed Critical GFM Beteiligungs und Management GmbH and Co KG
Publication of EP1699580A1 publication Critical patent/EP1699580A1/fr
Application granted granted Critical
Publication of EP1699580B1 publication Critical patent/EP1699580B1/fr
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
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B21J9/04—Piercing presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/10—Piercing billets

Definitions

  • the invention relates to a method and apparatus for producing a cylindrical hollow body from a blank, wherein the workpiece is opened by successive, mutually offset by the axis of the workpiece forged deformations in the core area and at the same time pushed onto a piercer, according to the preambles of claims 1 and 4 ,
  • Such a method and such a device are known from SU 715 195 A known.
  • the disadvantage is that the core material is opened irregularly by the unavoidable inhomogeneities and cracks remain in the region of the inner wall of the resulting hollow body, which significantly affect the strength properties of the workpiece.
  • To avoid such cracks in the region of the inner surface of the hollow body has already been proposed ( SU 715 195 A ), to open the core through a piercer, which projects into the area of forging deformation of the blank, that is, into an area in which the tensile stresses caused by the forging deformation become effective.
  • These tensile stresses acting on the core facilitate the penetration of the piercer into the core of the workpiece, whereby cracks are avoided when opening the core in front of the mandrel is prevented by the axial position of the mandrel.
  • the axial workpiece feed between the individual forging deformations is determined by the elastic deformability of the piercer in the axial direction, which significantly limits the workpiece feed.
  • the piercer is used essentially only to widen the already opened core of the workpiece ( RU 2 010 655 C1 )
  • the surface cracks resulting from the opening of the core can only be smoothed and partially covered by the mandrel, because the material in the crack region oxidizes and cools to the extent that welding of the cracks in the area of the piercer is no longer possible even with hot forging.
  • the invention is therefore based on the object, a method for producing a cylindrical hollow body of a blank of the type described in such a way that the workpiece feed can be significantly increased without fear of cracking in the inner surface region of the hollow body.
  • the invention solves the problem set by the fact that the workpiece during Schmiedeverformache with a predetermined axial force against the axial force against the workpiece vorschiebbaren punch mandrel is pressed, which is moved back between the successive Schmiedeverformungen synchronously with the axial feed of the workpiece in its initial position.
  • the workpiece feed depends on the working stroke of the piercer so that the workpiece feed can be selected according to the respective Lochungs committee.
  • the prerequisite is that the workpiece is subjected to a sufficient axial force to prevent yielding of the workpiece relative to the piercer during its working stroke.
  • the axial force to be applied to the workpiece therefore depends, among other things, on the particular material, on the temperature and on the deformation properties of the workpiece as well as on the friction conditions between the hole tool and the workpiece.
  • deformation conditions can already be created in the region of the end face of the workpiece facing the piercer which provide a crack-free inner surface of the workpiece make sure to produce hollow body.
  • the hole diameter of the workpiece can be gradually increased in successive steps each under a forging deformation.
  • a device with at least two forging tools which are diametrically opposed to one another with respect to the workpiece and which have an upstream of the forging tools in the feed direction of the workpiece Clamping head, which is connected to an axial feed drive and a rotary drive, and with a via an actuator axially displaceable piercer on the opposite side of the upstream chuck head of the forging tools are assumed.
  • the workpiece is to be rotated by a predetermined angle about its axis with the aid of the chuck tool and axially advanced according to the working stroke of the punch mandrel against the forging tools, wherein the punch mandrel synchronizes with the workpiece feed its initial position is to move back to continue the perforation in repetitive deformation steps and terminate. It goes without saying that this perforation go through the length of the workpiece, but can extend only over a partial length.
  • the axial loading of the workpiece can be done by means of the forging tools upstream clamping head itself, if provided for an end-side support of the workpiece in the chuck and the press cylinder engages the chuck.
  • Cheaper design conditions arise when the press cylinder is provided on the chuck and acts on a receiving opening for the piercer forming, frontal stop for the workpiece. This allows the feed drive of the clamping head be separated from the press cylinder, so that the stroke of the press cylinder can be kept small in comparison with the travel required for the feed drive.
  • the press cylinder can be connected to a rotary drive for the frontal stop to rotate the workpiece synchronously with the frontal stop.
  • the piercer may have a piercing tool with stepped diameter sections.
  • the piercer is to be positioned according to the respective work area opposite the forging tools, so that for each diameter section of the piercing tool, the core opening can be exploited by a transverse forging for punching.
  • this stepwise punching of the workpiece need not be limited to a workpiece passing direction.
  • both clamping heads with a press cylinder for the frontal loading of the workpiece in order to be able to act on the workpiece in both feed directions with a corresponding axial force.
  • the piercer must pass through the pressure cylinder of the associated clamping head axially in such a case.
  • This punching in opposite directions of feed can be performed by means of a single piercing pin when the hole punching tool is replaced. But it is also possible to assign each chuck a separate punch mandrel, which then passes through the respective pressing cylinder axially.
  • the device shown has forging tools 1 in the form of forging hammers, which are diametrically opposed to each other with respect to the workpiece 2. Although only two forging tools are apparent, two mutually offset by 90 ° hammer pairs are generally provided to increase performance, which are operated alternately.
  • the workpiece 2, which is delivered in the form of a blank with a full cross-section, but may also already be tubular, is guided by means of a forging tools 1 in the feed direction 3 of the workpiece 2 upstream clamping head 4.
  • the clamping head 4 is rotatably mounted in a housing 5, which carries a rotary drive 6 for the clamping head 4.
  • the housing 5 with the clamping head 4 is adjustable by means of a carriage 7 via a feed drive 8, preferably a positioning cylinder, along a guide 9.
  • the clamping head 4 also has an end stop 10 for the workpiece 2. This stop 10 is acted upon axially via the piston rod 11 of a compression cylinder 12, which is flanged to the housing 5 of the clamping head 4.
  • a synchronously with the rotary drive 6 for the clamping head 4 controllable rotary drive 13 can be provided for the piston rod 11. It is important to ensure that despite the rotationally fixed connection, the axial displaceability of the piston rod 11 is not affected.
  • the blacksmith tools 1 a further clamping head 14 downstream, which is also rotatably mounted in a housing 15 and is driven by a rotary drive 16.
  • the clamping head 14 is mounted with the housing 15 via a carriage 17 which can be moved by a feed drive 18 along a guide 19.
  • the hollow clamping head 14 is penetrated by a piercer 20, which can be driven back and forth via an actuator 21 in response to the workpiece feed.
  • the piercing tool 22 of the piercer 20, which projects into the region of the forging deformations of the workpiece 2 between the forging tools 1, has a tapered end 23 and a subsequent, cylindrical calibration section 24, so that the punching and calibrating are performed in one operation can.
  • the workpiece 2 is provided before the actual piercing process with a central recess 25 which drilled before clamping the workpiece 2, but also after clamping by the punch 22 itself or a positionable in the center of the machine special tool can be made.
  • For punching the workpiece 2 is in the periods in which it is released by the forging tools 1, by means of the feed drive 8 gradually moved through the forging and simultaneously rotated by means of the rotary drive 6 by a predetermined angular pitch about its axis.
  • the Schmiedewerkept carried out after these feed movements on the forging tools 1 in the core of the workpiece 2 tensile stresses acting in the opening direction on the core and support originating from the punch 22 compressive stresses, so that the perforation of the workpiece 2 on the piercer 20 with a comparatively low effort can be made.
  • the piercing mandrel 20 is advanced during the forging deformation of the workpiece 2 between the forging tools 1 against the feed direction 3 of the workpiece 2, wherein the workpiece 2 is acted upon by a corresponding pressing force in the feed direction 3 by the pressing cylinder 12.
  • the piercing mandrel 20 is returned to its starting position synchronously with the advancing drive 8 via the adjusting cylinder 21, in order to be advanced against the advancing direction 3 against the workpiece 2 during the subsequent forging deformation.
  • the workpiece feed in the axial direction and in the circumferential direction can no longer be performed by the chucking tools 1 upstream clamping head 4, as soon as this chuck 4 associated workpiece end is processed.
  • the opposite clamping head 14 takes over the feed movements both in the axial and in the circumferential direction.
  • the frontal stop 10 for the workpiece 2 is provided with a receiving opening 26 for the punching tool 22, so that the workpiece support is secured throughout the pressing cylinder 12.
  • the workpiece 2 can be processed stepwise.
  • the existing hole is widened by means of the larger diameter portion 28, again with a simultaneous forging deformation, so that the tensile stresses effective by this forging deformation can be advantageously used for the hole process.
  • the piercing mandrel 20 is to be displaced by means of the actuating drive 21 so that the diameter section 28 of the piercing tool 22 comes to rest in the region of the forging deformations of the workpiece 2 by the forging tools 1.
  • the invention is of course not limited to the illustrated embodiments. It depends only on a corresponding axial loading of the workpiece during the working stroke of the piercer 20, wherein the working stroke is performed during the forging deformation.
  • the forging deformation can be done by forging hammers, but also by forging presses.
  • the workpiece 2 can also be described in the manner described both hot, semi-warm, but also cold-formed.
  • the forging tools can also be controlled so that they are switched after a punching of the workpiece from a nucleating to a simultaneous, nuclear compressing impact sequence.
  • the perforated mandrel 20 itself can be held non-rotatably, but also rotate with the workpiece or are additionally driven to rotate with respect to the workpiece.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Claims (9)

  1. Procédé pour produire un corps creux cylindrique à partir d'une ébauche, la pièze d'oeuvre (2) étant ouverte dans la zone centrale, en procédant à des étapes de formage successives, décalées angulairement les unes par rapport aux autres autour de l'axe de la pièce d'oeuvre, et étant en même temps enfilée sur un poinçon (20), caractérisé en ce que, pendant les formages par forgeage, la pièce d'oeuvre (2) est pressée, avec une force axiale susceptible d'être prédéterminée, contre le poinçon (20) susceptible d'être avancé contre la pièze d'oeuvre (2), à l'encontre de cette force axiale, le poinçon, entre les formages par forgeage successifs, étant rappelé à sa position initiale de manière synchrone avec l'avance axiale de la pièce d'oeuvre.
  2. Procédé selon la revendication 1, caractérisé en ce que, avant le formage par forgeage, la pièce d'oeuvre est munie d'une cavité cylindrique, sur sa face frontale tournée vers le poinçon.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le diamètre de trou de la pièze d'oeuvre est agrandi petit à petit, par étapes successives, en procédant chaque fois à un formage par forgeage.
  4. Dispositif de mise en oeuvre du procédé pour produire un corps creux cylindrique selon l'une des revendications 1 à 3, avec au moins deux outils de forgeage (1), diamétralement opposée par rapport à la pièce d'oeuvre, avec une tête de serrage (4), montée à l'avant des outils de forgeage en observant dans la direction d'avancement de la pièce d'oeuvre, la tête de serrage étant reliée à un entraînement d'avancement (8) axial et à un entraînement en rotation (6), et avec un poinçon (20) déplaçable axialement par l'intermédiaire d'une transmission de réglage (21), sur le côté, opposé à la tête de serrage (4) disposée à l'avant, des outils de forgeage (1), caractérisé en ce que la tête de serrage (4), montée à l'avant des outils de forgeage (1), présente une butée (10), côté frontal, pour la pièce d'oeuvre (2), ainsi qu'un cylindre de pressage (12) pour la pièce d'oeuvre (2) soutenue côté frontal, et en ce que le poinçon (20) est déplaçable axialement, dans un sens et dans l'autre, par l'intermédiaire de sa transmission de réglage (21), en fonction de l'entraînement d'avancement (8) de la tête de serrage (4).
  5. Dispositif selon la revendication 4, caractérisé en ce que le cylindre de pressage (12) est associé à la tête de serrage (4) et sollicite la butée (10), située côté frontal, formant une ouverture de réception (26) pour le poinçon (20), pour la pièce d'oeuvre (2).
  6. Dispositif selon la revendication 4 ou 5, caractérisé en ce que le cylindre de pressage (12) est relié à un entraînement en rotation (13) pour à butée (10), située côté frontal.
  7. Dispositif selon l'une des revendications 4 à 6, caractérisé en ce que le poinçon (20) présente un outil de perçage (22) avec des tronçons d'un certain diamètre (27, 28) étagés.
  8. Dispositif selon l'une des revendications 4 à 7, avec une tête de serrage traversée par un poinçon, reliée à un entraînement d'avancement pour la pièce d'oeuvre, disposée en aval des outils de forgeage, caractérisé en ce que les deux têtes de serrage (4, 14) sont équipées d'un cylindre de pressage (12) pour la sollicitation, côté frontal, de la pièce d'oeuvre (2), et le poinçon (20) traverse le cylindre de pressage (12) de la tête de serrage (4, 14) afférente.
  9. Dispositif selon la revendication 8, caractérisé en ce qu'aux deux têtes de serrage (4, 14) est associé un poinçon (20) traversant le cylindre de pressage (12) afférent.
EP04802020A 2003-12-30 2004-12-28 Procede et dispositif pour produire un corps creux cylindrique a partir d'une ebauche Expired - Lifetime EP1699580B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0209703A AT501152B8 (de) 2003-12-30 2003-12-30 Verfahren und vorrichtung zum herstellen eines zylindrischen hohlkörpers aus einem rohling
PCT/AT2004/000458 WO2005063421A1 (fr) 2003-12-30 2004-12-28 Procede et dispositif pour produire un corps creux cylindrique a partir d'une ebauche

Publications (2)

Publication Number Publication Date
EP1699580A1 EP1699580A1 (fr) 2006-09-13
EP1699580B1 true EP1699580B1 (fr) 2010-04-21

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EP04802020A Expired - Lifetime EP1699580B1 (fr) 2003-12-30 2004-12-28 Procede et dispositif pour produire un corps creux cylindrique a partir d'une ebauche

Country Status (7)

Country Link
US (1) US7434434B2 (fr)
EP (1) EP1699580B1 (fr)
AT (2) AT501152B8 (fr)
DE (1) DE502004011081D1 (fr)
ES (1) ES2343839T3 (fr)
RU (1) RU2347641C2 (fr)
WO (1) WO2005063421A1 (fr)

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RU2454286C2 (ru) * 2010-10-12 2012-06-27 Открытое акционерное общество "Научно-производственное объединение "Центральный научно-исследовательский институт технологии машиностроения" (ОАО НПО "ЦНИИТМАШ") Способ производства бесшовных горячедеформированных котельных и паропроводных труб
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DE102014218768A1 (de) * 2014-09-18 2016-03-24 Zf Friedrichshafen Ag Welle, Getriebe sowie Verfahren zur Herstellung einer Welle
DE102014218766A1 (de) * 2014-09-18 2016-03-24 Zf Friedrichshafen Ag Welle, Getriebe sowie Verfahren zur Herstellung einer Welle
US9638357B1 (en) * 2015-06-24 2017-05-02 Omax Corporation Mechanical processing of high aspect ratio metallic tubing and related technology
DE102016205549A1 (de) 2016-04-04 2017-10-05 Zf Friedrichshafen Ag Hohlwelle für eine Schmiermittelversorgung eines Schaltgetriebes
US11122741B2 (en) * 2018-01-30 2021-09-21 Cnh Industrial America Llc Stalk roller assembly for an agricultural system
CN111069298B (zh) * 2019-12-19 2021-10-08 太原重工股份有限公司 穿孔机数字化控制系统及方法
US12403621B2 (en) 2019-12-20 2025-09-02 Hypertherm, Inc. Motorized systems and associated methods for controlling an adjustable dump orifice on a liquid jet cutting system
WO2021195106A1 (fr) 2020-03-24 2021-09-30 Hypertherm, Inc. Joint haute pression pour système de coupe à jet de liquide
EP4126452A1 (fr) 2020-03-26 2023-02-08 Hypertherm, Inc. Clapet anti-retour à synchronisation libre
KR20230005840A (ko) 2020-03-30 2023-01-10 하이퍼썸, 인크. 다기능 접속 종방향 단부들을 갖는 액체 제트 펌프를 위한 실린더
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Also Published As

Publication number Publication date
WO2005063421A1 (fr) 2005-07-14
EP1699580A1 (fr) 2006-09-13
AT501152B8 (de) 2007-02-15
DE502004011081D1 (de) 2010-06-02
ES2343839T3 (es) 2010-08-11
RU2347641C2 (ru) 2009-02-27
US7434434B2 (en) 2008-10-14
AT501152B1 (de) 2006-07-15
RU2006127418A (ru) 2008-02-10
ATE464960T1 (de) 2010-05-15
US20070186604A1 (en) 2007-08-16
AT501152A4 (de) 2006-07-15

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