EP0421144A2 - Outil extensible - Google Patents

Outil extensible Download PDF

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Publication number
EP0421144A2
EP0421144A2 EP90117223A EP90117223A EP0421144A2 EP 0421144 A2 EP0421144 A2 EP 0421144A2 EP 90117223 A EP90117223 A EP 90117223A EP 90117223 A EP90117223 A EP 90117223A EP 0421144 A2 EP0421144 A2 EP 0421144A2
Authority
EP
European Patent Office
Prior art keywords
segments
segment
tool according
spreading tool
stamp
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Withdrawn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
EP90117223A
Other languages
German (de)
English (en)
Other versions
EP0421144A3 (en
Inventor
Jürgen Dipl.-Ing. Westhof
Norbert Dr.-Ing. Golze
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.)
Schoneweiss & Co GmbH
Schoeneweiss and Co GmbH
Original Assignee
Schoneweiss & Co GmbH
Schoeneweiss and Co GmbH
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 Schoneweiss & Co GmbH, Schoeneweiss and Co GmbH filed Critical Schoneweiss & Co GmbH
Publication of EP0421144A2 publication Critical patent/EP0421144A2/fr
Publication of EP0421144A3 publication Critical patent/EP0421144A3/de
Withdrawn legal-status Critical Current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
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/02—Dies or mountings therefor
    • B21J13/025—Dies with parts moving along auxiliary lateral directions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • B21K1/762—Coupling members for conveying mechanical motion, e.g. universal joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • B21K1/762—Coupling members for conveying mechanical motion, e.g. universal joints
    • B21K1/765—Outer elements of coupling members

Definitions

  • the invention relates to an expanding tool according to the preamble of claim 1, which is provided for the production of hollow workpieces.
  • Such spreading tools for forging dies are known from DE-PS 30 04 024 and EP-A1-0 013 545, the segments of which are separated from one another by radially extending joints.
  • these joints are widened to form gaps, into which the plastic or liquid workpiece material penetrates during the forging process and can leave disruptive burrs on the inside contour of the workpiece, which have to be removed by machining.
  • This is the case, for example, if the burrs are arranged in the recesses of outer joint bodies for homokinetic joints of motor vehicles that receive the drive force balls.
  • the aim is to forge hollow workpieces without disruptive burrs in the inner contour, so that post-processing to remove the burrs is not necessary.
  • this object is achieved by the characterizing part of claim 1.
  • the even number of at least four segments and the course of the parting plane outside the longitudinal central axis, ie not in the radial direction of the expansion sleeve, allows the parting lines to be arranged such that they do not open during the expansion of the expansion sleeve and thus preventing the penetration of workpiece material during forging.
  • the inner contour of the workpieces produced in this way is free of burrs and therefore requires no reworking.
  • every second segment is arranged as an inner segment between each two adjacent outer segments, with the parting planes converging aside on each inner segment in the direction of the outer sleeve contour, whereby each inner segment is essentially wedge-shaped in cross section and as one radially outward through the punch movable drive segment for radially outward movement of the adjacent outer segments is formed.
  • An expansion sleeve which has six segments and whose parting plane describes a triangle when considering the expansion sleeve cross-section has proven to be advantageous.
  • Each segment can be rigid and radially displaceable overall, but elastically deformable and thereby radially movable segments are also possible.
  • the segments are fastened axially displaceably on the stamp.
  • the inner and / or the outer segments can be attached to the free end section of the stamp and / or to the adjacent part of the stamp.
  • the segments are preferably fastened with one of their ends on the stamp in a radially non-displaceable manner and, in the rest, are elastically deformable in the radial direction.
  • the outer segments can be connected to one another at one of their ends Be connected segment disc, which is arranged axially displaceable on the free end portion of the punch.
  • the segment disk is axially displaceable on a pin arranged at the tapered end of the free end section of the punch or is fastened to a pin axially displaceably held in an axial bore in the punch.
  • the latter pin can be spring-loaded in the direction of the free end section of the stamp.
  • the inner segments are connected to one another at each of their ends by a segment ring which is arranged axially displaceably on the part of the stamp which adjoins the free end section of the stamp.
  • the outer segments with their ends facing away from the segment ring can be supported on the segment disk.
  • the expanding tool according to the invention is intended for the production of hollow - not shown - workstations and comprises a stamp 1 and an expansion sleeve 2.
  • the stamp 1 has a free end section 3, hereinafter referred to as the lower stamp end 3, a central, cylindrical stamp section 4 and one at its upper end End trained cone 5 on.
  • the stamp 1 is inserted with this cone 5 from above into a stamp holder plate 6 which is detachably fastened to the actual stamp holder (not shown) by means of fastening means 7, which are only indicated here.
  • the expansion sleeve 2 is attached to the punch 1 in the area of the lower punch end 3 and consists of three outer segments 8 and three inner segments 9, which are arranged alternately with the outer segments 8, circumscribing a receiving opening 10 for the lower punch end 3.
  • the receiving opening 10 is provided for the positive reception of the lower punch end 3 and, like this, is conical and tapers downward.
  • All segments 8, 9 can be moved in the radial direction by elastic deformation from an unspread position to a spread position and back. In the latter position, they define an outer contour which corresponds to the inner contour of the workpiece to be produced, which in the present exemplary embodiment is an outer joint body for a constant velocity joint for motor vehicles. Accordingly, the outer contour of the expansion sleeve 2 is essentially spherical and has, at regular intervals, outwardly directed projections 11 which correspond to recesses in the inner contour of the outer joint body. These recesses are provided for receiving balls that transmit drive forces.
  • the outer segments 8 are essentially in the form of a circular section in cross section and the inner segments 9 are essentially wedge-shaped in cross section.
  • the inner and outer boundary surfaces 12, 13 form the separating joints 22 of the expansion sleeve 2 separating the outer segments 8 from the inner segments 9.
  • These separating joints 22 run outside the longitudinal central axis L of the expanding sleeve 2, ie not in the radial but in the secant direction in cross section essentially circular expansion sleeve 2 and enclose a triangle when considering the expansion sleeve cross-section.
  • the latter segments represent drive segments for the outer segments 8 and impart them to a radially outward movement, i.e. when expanding the expansion sleeve 2, a movement that is also directed outwards.
  • the movement back into the unspread position takes place due to the elastic restoring forces built up in the segments 8, 9 during the expansion.
  • the inner and the outer boundary surfaces 12, 13 remain in mutual contact; i.e. the parting lines 22 remain closed and therefore do not take up any liquid or plastic workpiece material even when the expansion sleeve 2 is in the spread state.
  • the mutually facing, radially extending inner boundary surfaces 14 of the inner segments 9 are covered by the inner boundary surfaces 12 of the outer segments 8 over the entire distance of the radial movement of the inner segments 9. In this way, the penetration of workpiece material into the gaps 23 between the inner boundary surfaces 14 of the inner segments 9 is prevented even if these gaps 23 have their greatest width when the expansion sleeve 2 is spread.
  • the segments 8, 9 are fastened with one of their ends on the plunger 1 in a radially non-displaceable manner and are elastically deformable in the radial direction.
  • the outer segments 8 are connected to one another at their lower ends by a segment disk 15 which is axially displaceably fastened to a pin 16 projecting at the tapered end of the lower stamp section 3 by means of a screw 17 seated in a recess 24 of the outer sleeve contour.
  • This type of attachment with a recess 24 in the outer contour of the expansion sleeve 2 at its lower end can be used because, in the present exemplary embodiment, the already pre-forged outer joint body of the homokinetic joint is only drawn in at its upper free end to form the undercut.
  • the interruption can be closed by a cover or another form of fastening of the segments 8, 9 on the punch 1 can be selected in order to ensure an uninterrupted outer contour of the expansion sleeve 2 .
  • Such a different type of fastening can take place, for example, on the central cylindrical stamp section 4 in that the segment ring of the inner segments is supported on an annular projection of the stamp holder and a segment ring of the outer segments is fastened to the segment ring of the inner segments.
  • the segment disc 15 is omitted.
  • a groove 18 is formed in their inner boundary surfaces 12 immediately adjacent to the segment disc 15.
  • the upper ends of the inner segments 9 are connected to one another by a segment ring 19 which is arranged axially displaceably on the part of the cylindrical stamp section 4 adjoining the lower stamp section 3.
  • the lower ends of the inner segments 9 are designed as support surfaces 20, which are formed on the support surface 21 Support the top of the segment disc 15. All of the support surfaces 20, 21 are designed to descend from the pin 16 in the direction of the outer sleeve contour.
  • the function of the expanding tool according to the invention is described below in the case of forming the undercut of the pre-forged outer joint body of the homokinetic joint:
  • the stamp 1 with the expanding sleeve 2 is moved by moving the stamp holder downward into the outer joint body, not shown, which is arranged in a die, not shown, of a forging die.
  • the segment disc 15 with the outer segments 8, taking the inner segments 9 supported on it move as far upward in the axial direction as possible it allows the free length H of the pin 16 above the segment disc 15 or the depth T of the recess 24 below the screw 17.
  • the stamp 1 is raised by means of the stamp holder, the conical surface of the lower stamp end 3 separating from the conical surface of the receiving opening 10, so that the segments 8, 9 under the action of the elastic restoring forces which are present in them have built up during spreading, can move back to the unspread position.
  • the diameter of the expansion sleeve 2 is reduced so much that it can be pulled out of the finished forged outer joint body.
  • the spreading tool according to the invention is suitable as a retainer or shaping element for all shaping devices for hollow workpieces with or without undercut and using liquid or plastically deformable workpiece material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
EP19900117223 1989-10-05 1990-09-06 Expanding tool Withdrawn EP0421144A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893933293 DE3933293A1 (de) 1989-10-05 1989-10-05 Spreizwerkzeug
DE3933293 1989-10-05

Publications (2)

Publication Number Publication Date
EP0421144A2 true EP0421144A2 (fr) 1991-04-10
EP0421144A3 EP0421144A3 (en) 1991-10-09

Family

ID=6390895

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900117223 Withdrawn EP0421144A3 (en) 1989-10-05 1990-09-06 Expanding tool

Country Status (3)

Country Link
EP (1) EP0421144A3 (fr)
JP (1) JPH03133535A (fr)
DE (1) DE3933293A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4214444B4 (de) * 1992-05-06 2004-07-29 Hmp Engineering Gmbh Verfahren zur Herstellung von Kugelschalen für Gleichlaufgelenke sowie Profildorn zur Verwendung in dem Verfahren
KR960015733B1 (ko) * 1994-07-16 1996-11-20 맹혁재 등속조인트의 외륜단조성형장치 및 그 단조성형방법
DE4433991C2 (de) * 1994-09-23 1999-01-07 Doege Eckart Spreizwerkzeug zur Herstellung hinterschnittener Werkstücke

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0049474A1 (fr) * 1980-10-02 1982-04-14 Nissan Motor Co., Ltd. Matrice de forgeage à fabriquer une piéce munie de rainures intérieures rétrécies
JPS57181737A (en) * 1981-04-28 1982-11-09 Aida Eng Ltd Manufacturing device of parts with opening of reduced smaller diameter than inner part extending over whole circumference
GB2129354A (en) * 1982-10-14 1984-05-16 Pfd Ltd Manufacture of article having undercut internal surface
EP0153810A1 (fr) * 1984-02-18 1985-09-04 Pfd Limited Outil et procédé pour la fabrication d'articles creux
WO1987001061A1 (fr) * 1985-08-17 1987-02-26 Pfd Limited Outil et procede de fabrication d'articles creux
GB2203076A (en) * 1987-04-10 1988-10-12 Loehr & Bromkamp Gmbh Press tooling for manufacturing constant velocity ratio universal joint members
EP0358784A1 (fr) * 1987-07-03 1990-03-21 Aida Engineering, Ltd. Appareil pour la fabrication d'un joint homocinétique

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0049474A1 (fr) * 1980-10-02 1982-04-14 Nissan Motor Co., Ltd. Matrice de forgeage à fabriquer une piéce munie de rainures intérieures rétrécies
JPS57181737A (en) * 1981-04-28 1982-11-09 Aida Eng Ltd Manufacturing device of parts with opening of reduced smaller diameter than inner part extending over whole circumference
GB2129354A (en) * 1982-10-14 1984-05-16 Pfd Ltd Manufacture of article having undercut internal surface
EP0153810A1 (fr) * 1984-02-18 1985-09-04 Pfd Limited Outil et procédé pour la fabrication d'articles creux
WO1987001061A1 (fr) * 1985-08-17 1987-02-26 Pfd Limited Outil et procede de fabrication d'articles creux
GB2203076A (en) * 1987-04-10 1988-10-12 Loehr & Bromkamp Gmbh Press tooling for manufacturing constant velocity ratio universal joint members
EP0358784A1 (fr) * 1987-07-03 1990-03-21 Aida Engineering, Ltd. Appareil pour la fabrication d'un joint homocinétique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 7, Nr. 25 (M-190)[1170], 2. Februar 1983; & JP-A-57 181 737 (AIDA ENGINEERING K.K.) 09-11-1982 *

Also Published As

Publication number Publication date
DE3933293A1 (de) 1991-04-11
EP0421144A3 (en) 1991-10-09
JPH03133535A (ja) 1991-06-06

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