EP0579005B1 - Procédé, dispositif et matrice pour la fabrication d'une pièce ayant une section profilée - Google Patents

Procédé, dispositif et matrice pour la fabrication d'une pièce ayant une section profilée Download PDF

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Publication number
EP0579005B1
EP0579005B1 EP93110036A EP93110036A EP0579005B1 EP 0579005 B1 EP0579005 B1 EP 0579005B1 EP 93110036 A EP93110036 A EP 93110036A EP 93110036 A EP93110036 A EP 93110036A EP 0579005 B1 EP0579005 B1 EP 0579005B1
Authority
EP
European Patent Office
Prior art keywords
die
workpiece
section
hole
die hole
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
EP93110036A
Other languages
German (de)
English (en)
Other versions
EP0579005A1 (fr
Inventor
Walter Pischel
Peter Kettner
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.)
Hirschvogel Umformtechnik GmbH
Original Assignee
Hirschvogel Umformtechnik 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 Hirschvogel Umformtechnik GmbH filed Critical Hirschvogel Umformtechnik GmbH
Publication of EP0579005A1 publication Critical patent/EP0579005A1/fr
Application granted granted Critical
Publication of EP0579005B1 publication Critical patent/EP0579005B1/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
    • 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
    • B21J5/12—Forming profiles on internal or external surfaces

Definitions

  • the invention relates to a method, a device and a die according to the preamble of claim 1 or 5 or 6.
  • the forming process forging is preferably used, because this not only enables cost-effective production, but also increases the strength of the workpiece during forging, which is desirable in most applications.
  • the present problem arises in particular in the case of a workpiece with two, in particular with regard to their surface precision, preferably with a positioning section such as a fastening foot and a different function, e.g. B. a drive function performing workpiece section.
  • a typical case for such a workpiece is a tooth of a gear which can be mounted on a wheel or a rod.
  • a high degree of strength is desired for such a workpiece, the fastening or foot part of the tooth having to be held with a precise fit.
  • such a fastening section is formed by a plate-shaped web, which has a precisely fitting width dimension and thus fits between two fastening flanges of a wheel and is screwed thereon.
  • EP-A-0 015 693 describes a method, a device and a die according to the preambles of claims 1, 5 and 6.
  • a profile section of a workpiece is reduced in its cross-sectional size with a relative displacement between the latter and a die and at the same time stretched in its length.
  • the reduction takes place on the entire lateral surface of the profile section in a die opening with a round cross section.
  • the invention has for its object to improve a method or a device or a matrix of the types mentioned above so that the workpiece can be manufactured in one piece while ensuring high strength and accuracy of fit.
  • the profile section on the workpiece is produced in one piece by, in particular, hot forging, the machining process which brings the profile section to fit takes place in that an axial Relative displacement between the workpiece or the profile section and a die, the profile section with its free end is first pressed through the reduction opening of the die.
  • the profile section not only obtains a high accuracy of fit on its broad sides, but the surface of the profile section is further solidified by the reduction, a simple, fast and therefore inexpensive production being possible.
  • the workpiece and / or the die can optionally be moved.
  • the reduction process preferably takes place at room temperature.
  • the method according to the invention can advantageously be carried out for all cold-formable materials, in particular metals, preferably steel.
  • the sub-claims contain features that contribute to problem solving, improve the strength and service life of the die, enable reduced areas of high dimensional accuracy, and also create advantageous device features that enable fast, accurate and high-performance production.
  • the workpiece is a mountable tooth 1 of a gearwheel 2, which is only partially indicated in FIG. 2, the tooth 1 in one piece from a tooth head 3, a fastening foot in the form of a plate or a web 4 and a base part 5, which is between the Tooth head 3 and the web 4 is arranged, and from which the tooth head 3 and the web 4 extend opposite to each other, namely in the arrangement according to FIG. 1 vertically upwards or vertically downwards along the vertical center line 6 to which the tooth 1 is symmetrical in the present embodiment.
  • the tooth head 3 is tooth 1 of a chain gear.
  • the tooth head 3 has a central driver pin 7 which engages in a chain link and at the same time borders between two chain links connected to this chain link.
  • the tooth head 3 is adapted on its side surfaces to the shape of the chain links facing it.
  • the width b of the plate-shaped or bar-shaped base is narrower than the width B of the existing tooth crown 10 and only slightly wider than the width b1 of the bar 4.
  • the base part 5 is larger than the bar 4 with its length L1, so that the base part projects beyond the web 4 in a cone shape on both end faces.
  • On both broad sides of the web 4 there is a tongue-shaped surface region 12 which extends upwards from its underside 11 in the central region and which is slightly recessed relative to the associated side surface 13a, 13b.
  • the mutually parallel side surfaces 13a, 13b form a fitting dimension with which the tooth 1 is inserted and held between parallel fitting surfaces 14a, 14b of the gear 2, e.g. by two or an indicated cross screw, which engages the web 4 and adjacent walls of the gear wheel 2 in holes (not shown), which are preferably drilled after the forming.
  • the free corners of the web 4 are preferably rounded.
  • the web 4 is first hot forged in a die, which is indicated schematically, with a die lower part 15a and a die upper part 15b made of a rectangular blank 17, the forged section expanding two-dimensionally and forming the flat web 14.
  • the tooth 1 to be formed is inserted into another die, also only indicated schematically, with a lower die part 16a and an upper die part 16b, and hot compressive forces are hot forged along the center line 6, the tooth crown 10 in particular being brought into its final shape.
  • the web 4 accommodated in the lower die part 16a is preformed to a width b2 in the previous forging process or in the current forging process, which is not only an oversize compared to the width b1 of a few tenths of a millimeter, but also converges towards the underside 12, ie is or is shaped slightly wedge-shaped, in order to be able to remove it from the lower die part 16a, which is ensured due to the slightly wedge-shaped shape.
  • 4a to 4c this conicity is shown larger for the purpose of illustration, in reality the existing inclination is approximately 0 ° 30 '.
  • a further shaping step consists in reducing the web 4 in terms of its width b2 by means of a die 18 with relative displacement, to the finished dimension b1.
  • the width b1 is reduced by a few tenths of a millimeter, resulting in flat, clean and dimensionally or precisely fitting side surfaces 13a, 13b with a fine surface quality.
  • the reduction can be done by moving the die 18 relative to the fixed tooth 1, as shown in Fig. 4c.
  • the tooth 1 is supported by a pressure piece 21 which acts against the tooth crown 10 against the preferably vertical, in particular downward thrust direction 19 of the die 18. It is also possible to keep the die 18 stationary and to press the tooth 1 through the die opening 22 by means of the pressure piece 21.
  • the pressure piece 21 can be a receiving part which is similar to a die part. After or parallel to the removal of the die 18, the tooth 1 which has been shaped to this extent can be removed or ejected from its holder.
  • the die 18 is held in a fixed or back and forth movable die holder 18a.
  • the supporting force 24 opposite the reducing force 23, which acts against the shaped surface of the tooth crown 10, does not cause any deformation of this shaped surface if there is a flat contact.
  • the die 18 has an elongated, approximately rectangular die hole 22, the material width b3 on the broad sides 26 of the die hole 22 being greater than the material width b4 on the narrow sides 27 of the die hole 22.
  • the die 18 is preferably circular on the outside and received in a correspondingly shaped receptacle of the die holder 18a in a rotationally secured manner.
  • the length L2 of the die hole 22 is dimensioned a few mm larger than the length L1 of the web 4, so that it is only reduced on the broad side.
  • the forming element of the die 18 is a bead 28 on the broad walls of the die hole 22, which is wedge-shaped or rounded in cross section, so that convergent reducing surfaces 28a and undercut free surfaces 28b result.
  • the angle of inclination W1 of the reducing surfaces 28a is preferably approximately 15 °, that of the free surfaces 28b is preferably approximately 9 °.
  • the die hole 18 is rounded in the inner corners lying outside the reduction area R, see radii r1.
  • the beads 28 are preferably slightly convex in their longitudinal direction, which is illustrated by the radius r2. This is because in the middle area of the reduced area the material offers a greater resistance when reducing than in the outer area and therefore expands somewhat or more in the middle area after the reduction than in the outer area. This is compensated for by the slightly convex beads 28, so that flat and parallel side surfaces 13a, 13b result after the reduction.
  • the plate-shaped die 18 consists of high-strength, hard material, in particular alloy steel.
  • predetermined breaking points 33 are preferably provided in the form of wedge-shaped notches in the existing walls, which extend over the entire length of the narrow-side walls.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Claims (11)

  1. Procédé pour fabriquer une pièce (1) ayant une section profilée (4) en un matériau métallique de préférence déformable à froid, dans lequel on amène une ébauche (17) tout d'abord à une forme préalable de préférence par forgeage à chaud, la section (4) étant moulée avec sur-longueur sur l'ébauche (17) par l'opération de forgeage, et pour fabriquer le profilé à la longueur finale (b1) la section (4) étant pressée de préférence à froid à travers l'ouverture de réduction et étant réduite sous un déplacement relatif axial entre la pièce (1) et une ouverture de réduction (22), caractérisé en ce que la section (4) est préformée en une forme de section transversale oblongue et réduite uniquement sur ses surfaces latérales larges (13a, 13b).
  2. Procédé selon la revendication 1, caractérisé en ce que la section (4) est sollicitée de préférence dans une matrice sous une pression de forgeage en direction de la pièce (1) en une seconde opération de formage.
  3. Procédé selon la revendication 2, caractérisé en ce que lors de la seconde opération de formage, la pièce (1) est simultanément forgée par une pression opposée de préférence dans la matrice.
  4. Procédé selon l'une quelconque au moins des revendications précédentes, caractérisé en ce que la pièce (1) est formée avec un moule pour dent de chaîne.
  5. Dispositif pour fabriquer une pièce (1) ayant une section profilée (4) en un matériau métallique déformable de préférence à froid, selon l'une quelconque au moins des revendications précédentes, comprenant une matrice (18) qui présente une ouverture de matrice (22), caractérisé en ce que l'ouverture de matrice (22) présente une forme de section transversale oblongue, et en ce que seules les parois larges (26) de l'ouverture de matrice (22) présentent des surfaces de réduction.
  6. Matrice pour fabriquer une pièce (1) ayant une section profilée (4) en un matériau métallique déformable de préférence à froid, selon l'une quelconque au moins des revendications précédentes, la matrice (18) présentant une ouverture de matrice (22), caractérisée en ce que l'ouverture de matrice (22) présente une forme de section transversale oblongue, et en ce que seules les parois larges (26) de l'ouverture de matrice (22) présentent des surfaces de réduction.
  7. Dispositif ou matrice selon l'une ou l'autre des revendications 5 et 6, caractérisé(e) en ce que l'ouverture de matrice (22) présente une forme de section transversale sensiblement rectangulaire.
  8. Dispositif ou matrice selon l'une quelconque des revendications 5 à 7, caractérisé(e) en ce que les surfaces de réduction présentent des bourrelets de réduction (28).
  9. Dispositif ou matrice selon l'une quelconque des revendications 5 à 8, caractérisé(e) en ce que les dimensions en largeur (b3) de la matrice (18) entre sa périphérie et le côté large (26) du trou de matrice (22) sont supérieures à celles des petits côtés (27) du trou de matrice (22).
  10. Dispositif ou matrice selon l'une quelconque des revendications 5 à 9, caractérisé(e) en ce que les surfaces de réduction (28) sont incurvées de façon légèrement convexe en direction périphérique.
  11. Dispositif ou matrice selon l'une quelconque des revendications 5 à 10, caractérisé(e) en ce que la forme de section transversale extérieure de la matrice (18) est ronde.
EP93110036A 1992-06-23 1993-06-23 Procédé, dispositif et matrice pour la fabrication d'une pièce ayant une section profilée Expired - Lifetime EP0579005B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4220523A DE4220523A1 (de) 1992-06-23 1992-06-23 Verfahren zum Herstellen eines einen Preßabschnitt aufweisenden Werkstücks und Vorrichtung zur Durchführung des Verfahrens
DE4220523 1992-06-23

Publications (2)

Publication Number Publication Date
EP0579005A1 EP0579005A1 (fr) 1994-01-19
EP0579005B1 true EP0579005B1 (fr) 1997-09-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP93110036A Expired - Lifetime EP0579005B1 (fr) 1992-06-23 1993-06-23 Procédé, dispositif et matrice pour la fabrication d'une pièce ayant une section profilée

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EP (1) EP0579005B1 (fr)
DE (2) DE4220523A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2386576B (en) * 2002-03-06 2004-02-25 Adcock Tech Ltd A method of manufacture of a metallic component, apparatus when used in the method and a method of finishing a metallic component
CN107160118A (zh) * 2017-07-05 2017-09-15 泰州市东方传动技术有限公司 一种十字轴的加工工艺

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1010230A (fr) * 1949-02-03 1952-06-09 Procédé de production de pièces pleines et creuses sur une presse à forger
DE2659471A1 (de) * 1976-12-30 1978-07-13 Peltzer & Ehlers Verfahren zur herstellung von pressteilen sowie schmiedemaschine hierfuer
GB2042377B (en) * 1979-02-28 1982-10-27 Stevens & Bullivant Manufacture of track rod ends
DE3427156C2 (de) * 1984-07-24 1986-07-17 Bayerisches Leichtmetallwerk Graf Blücher von Wahlstatt GmbH & Co KG, 8000 München Verfahren zum Herstellen eines Synchronteils mit hinterschnittenen Zähnen

Also Published As

Publication number Publication date
DE4220523A1 (de) 1994-01-05
DE59307240D1 (de) 1997-10-09
EP0579005A1 (fr) 1994-01-19

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