EP2106309B1 - Procédé de fabrication d'une pièce forgée, pièce forgée et matrice de forgeage - Google Patents

Procédé de fabrication d'une pièce forgée, pièce forgée et matrice de forgeage Download PDF

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Publication number
EP2106309B1
EP2106309B1 EP07817679A EP07817679A EP2106309B1 EP 2106309 B1 EP2106309 B1 EP 2106309B1 EP 07817679 A EP07817679 A EP 07817679A EP 07817679 A EP07817679 A EP 07817679A EP 2106309 B1 EP2106309 B1 EP 2106309B1
Authority
EP
European Patent Office
Prior art keywords
extension
teeth
forged
forged part
forging
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.)
Not-in-force
Application number
EP07817679A
Other languages
German (de)
English (en)
Other versions
EP2106309A1 (fr
Inventor
Peter Kolbe
Thomas Körner
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.)
Gesenkschmiede Schneider GmbH
Original Assignee
Gesenkschmiede Schneider 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 Gesenkschmiede Schneider GmbH filed Critical Gesenkschmiede Schneider GmbH
Publication of EP2106309A1 publication Critical patent/EP2106309A1/fr
Application granted granted Critical
Publication of EP2106309B1 publication Critical patent/EP2106309B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/001—Extruding metal; Impact extrusion to improve the material properties, e.g. lateral extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/04—Shaping in the rough solely by forging or pressing
    • 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
    • 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
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • 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
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/12—Making machine elements axles or shafts of specially-shaped cross-section

Definitions

  • the invention relates to a method for producing a forged part, in particular segment shaft, formed with a three teeth, one-sided, asymmetric extension and the forging produced thereon in particular segment shaft in a substantially elongated shape with a one-three teeth, unilateral asymmetric extension and the forging die for carrying out the method.
  • the DE 32 35 115 A1 (HITACHI Ltd) refers to the production of flange shafts.
  • the flanges are loaded only on their peripheral area to pressure - but there are no rising flanks, which are typical for teeth and subject to special loads.
  • the degree of deformation for an asymmetric segment shaft is much higher and the load on the teeth is different.
  • segment shafts with a one-sided extension with three or more teeth There are known segment shafts with a one-sided extension with three or more teeth. These segment waves are subject to a high load, especially on the flanks of the teeth. They are preferably installed in the motion train of a steering of commercial vehicles. Previous segments have been milled from solid material. However, this requires a high cycle time, high material consumption, and high tooling costs. In addition, the flanks do not have the required strength and must be reworked, e.g. hardened, become. The fiber course does not correspond to the ideal force curve.
  • round material is extruded cross-sectionally on the face, so that the material flows transversely to the pressing direction into a one-sided extension.
  • the Querf thoroughlygepresste blank is removed with lateral extension of the pressing tool and fed to a forging die, in which the blank is forged to a forging part to near final shape.
  • the round material In order to apply lower pressing forces, the round material is heated before the transverse extrusion.
  • the round material is easier to reshape, the fiber flow is better coherent.
  • cross-extrusion the pressing movement is much slower than hammer-striking forging.
  • the raw material is preferably rolled round steel, in particular coke-rolled round steel. This raw material advantageously leads to an end product with the required high strength.
  • the forging is preferably standing, i. in the axial direction of the blank, forged in the gravitational direction.
  • the weight of the forging hammer is thus exploited.
  • the blank is hot forged in one stroke.
  • the forging is machined with at least one extension at least at the end of the at least one extension.
  • the excess material is preferably ground down to the final dimension. The fiber flow in the extension is not disturbed or broken and remains as desired.
  • the forging is a segment shaft with three teeth as an asymmetrical extension.
  • the segment shaft is intended for use in commercial vehicles, in particular in their steering systems.
  • the highest forces and torques act on the tooth flanks of the middle tooth. Therefore, it is necessary that the fiber flow in the flanks of the tooth is formed particularly well parallel to the flanks. This is achieved by transverse extrusion of round stock and subsequent drop forging of the blank.
  • the extension with due to the Querf diepressens parallel to the extension edge extending fiber profile leads to an increased, desired strength of the forged as a whole and the one-sided, asymmetrical extension.
  • a break, upsetting or deflection of the fiber flow in the region of the extension are essentially absent.
  • the extension of the forging preferably has at least one tooth, in particular three teeth, in order to advantageously obtain a forged part which can be used as a segment shaft in commercial vehicles.
  • the central tooth of a segment shaft substantially has a fiber flow running parallel to the flank of the tooth. This leads to a very high strength of the most loaded tooth, especially in the flank area. It is thus achieved a long service life of the forging.
  • the manufacturing costs, in particular the cycle time, are lower than in conventional machining production processes.
  • the ends of the at least one extension, in particular of the teeth, are machined, preferably ground. As a result, disturbing burrs are removed due to the expansion joint of the forging die, whereby the favorable fiber progressions are retained.
  • a forging die which has at least one expansion joint in engraving end extensions for receiving excess material, scale, lubricant, etc.
  • the die according to the invention allows the fiber courses, which are favorably deformed in the transverse extrusion method, to exist, in particular at the end of the extensions, and further presses the fiber progressions or the fiber flow. A breaking, upsetting or deflection of the fiber flow on a gravure wall is essentially avoided due to the expansion joint at the corresponding engraving area. Excess material can escape into the expansion joint or expansion groove in the die.
  • the Fig. 1 shows in a schematic cross-sectional view of a first process step for producing a forged part of a cylindrical round material 1.
  • the round material 1 is coke-rolled round steel and has a fiber profile 2a, 2b parallel to the walls.
  • press punches 5, 6 are arranged, which press the round material 1 in a first mold 7 transversely.
  • the round material 1 is pressed by the lateral Querf capitapressen to a blank with a one-sided material accumulation in an extension 8.
  • the first mold 7 has a one-sided engraving recess 9.
  • the fiber profiles 2a, 2b also called fiber flow, which are seen in cross-section, extend in the direction of the extension 8 without being broken during the transverse extrusion molding.
  • the round material is heated before the transverse extrusion, thus the pressing forces for the cross extrusion are low.
  • the Fig. 2 shows in the radial cross-section of the resulting by the extrusion extrusion blank 10.
  • the extension preform 8 is not yet clearly formed.
  • the one-sided extension shape is achieved only by subsequent forging in a forging die and subsequent machining.
  • the fiber courses 2a, 2b are nevertheless advantageously formed parallel to flanks of the extension 8 or they extend straight towards the extension end.
  • the Fig. 3 shows the standing forged in the longitudinal direction of the blank 10 forging 11.
  • the forged part 11 has in this embodiment, pronounced teeth 12, 13 and a hidden tooth 14 on.
  • the forging 11 is forged in the forging very close to the final dimensions.
  • the Fig. 4 shows in cross-section the forging die 15 with forged forging 11 in radial cross-section.
  • an expansion joint or expansion groove 16 is formed in the engraving end extensions of the forging die 15.
  • the expansion joints 16 serve to absorb excess material, scale, lubricant etc. during forging so that material can escape into the expansion joints and the fiber courses 2a, 2b are not broken. Continuous fiber progressions are particularly advantageous for a forged part 11 with high strength.
  • the one-sided extension 8 on the forging 11 is, as in the Fig. 2 and 4 shown formed into three teeth 12, 13, 14.
  • the center tooth 12 is exposed to particularly high loads when the forged part 11 is used as a segment shaft in commercial vehicles.
  • the central tooth 12 has a fiber path 2 b running essentially parallel to the flank 20.
  • the fiber flows to the flank 19 can be slightly oblique, since they are adjacent to the side edges of the extension 8.

Landscapes

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

Claims (10)

  1. Procédé de fabrication d'une pièce forgée, en particulier un arbre segmenté (11) pourvu d'un prolongement unilatéral asymétrique formé en trois dents (11, 12, 13) un matériau rond (1) étant dans un premier moule (7) comprimé par extrusion transversale latérale en une ébauche (10) dotée d'une accumulation de matière unilatérale et ensuite forgé dans une matrice de forgeage (15) proche de la forme définitive, par laquelle l'allure de fibre sur les flancs de la dent moyenne est formé de manière particulièrement bien parallèle aux flancs et conduit à une résistance plus élevée de la dent moyenne.
  2. Procédé selon revendication 1, caractérisé en ce que le matériau rond (1) est réchauffé avant la compression par extrusion transversale.
  3. Procédé selon revendication 1 ou 2 caractérisé en ce que l'ébauche (10) est comprimée dans une matrice de forgeage (15) avec au moins un appendice de gravure avec au moins un joint de dilatation (16, 17, 18).
  4. Procédé selon l'une des revendications précédentes 1 à 3, caractérisé en ce que le matériau brut de l'acier rond laminé est particulièrement un acier rond laminé au coke.
  5. Procédé selon l'une des revendications précédentes 1 à 4 caractérisé en ce que la pièce forgée (11) est forgée debout dans l'axe de l'ébauche (10).
  6. Procédé selon revendication 3 caractérisé en ce que la pièce forgée (11) est enlevée par usinage avec un prolongement unilatéral asymétrique formé en trois dents (8) en raison des joints de dilatation (16, 17, 18) dans la matrice de forgeage (15) au moins à l'extrémité des dents.
  7. Procédé selon l'une des revendications 1 à 6 caractérisé en ce que la pièce forgée (11) est un arbre segmenté avec trois dents (12, 13, 14).
  8. Pièce forgée, plus particulièrement arbre segmenté (11) fabriqué essentiellement dans une forme oblongue avec un prolongement unilatéral asymétrique formé en trois dents (11, 12, 13) selon un procédé conforme aux revendications 1 à 7 l'allure de fibre (2A, 2B) dans les flancs de la dent moyenne étant formée de manière particulièrement bien parallèle aux flancs.
  9. Pièce forgée selon revendication 8, caractérise en ce que les fins de trois dents du prolongement unilatéral asymétrique sont usinés.
  10. Matrice de forgeage (15) en vue de la fabrication d'un arbre segmenté avec un prolongement unilatéral asymétrique formé en trois dents (11, 12, 13) et en vue de l'application du procédé selon l'une des revendications 1 à 7, la matrice de forgeage (15) présentant dans les appendices de gravure au moins un joint de dilatation (16) pour la fixation de l'excédent de matériau, calamine, etc.
EP07817679A 2006-12-19 2007-10-16 Procédé de fabrication d'une pièce forgée, pièce forgée et matrice de forgeage Not-in-force EP2106309B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006060020A DE102006060020A1 (de) 2006-12-19 2006-12-19 Verfahren zur Herstellung eines Schmiedeteils, Schmiedeteil und Schmiedegesenk
PCT/DE2007/001844 WO2008074279A1 (fr) 2006-12-19 2007-10-16 Procédé de fabrication d'une pièce forgée, pièce forgée et matrice de forgeage

Publications (2)

Publication Number Publication Date
EP2106309A1 EP2106309A1 (fr) 2009-10-07
EP2106309B1 true EP2106309B1 (fr) 2010-05-12

Family

ID=39027072

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07817679A Not-in-force EP2106309B1 (fr) 2006-12-19 2007-10-16 Procédé de fabrication d'une pièce forgée, pièce forgée et matrice de forgeage

Country Status (5)

Country Link
EP (1) EP2106309B1 (fr)
AT (1) ATE467472T1 (fr)
DE (2) DE102006060020A1 (fr)
ES (1) ES2356327T3 (fr)
WO (1) WO2008074279A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101537437B (zh) * 2009-04-22 2011-01-05 浙江飞挺管业有限公司 冷挤压成型三通管件工艺的卸压装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH232406A (de) * 1942-01-31 1944-05-31 Ig Farbenindustrie Ag Gesenk.
AT235115B (de) * 1961-12-09 1964-08-10 Carl Dan Peddinghaus Kommandit Verfahren zur Herstellung von Gesenkschmiedestücken, insbesondere Achsschenkeln, und Vorrichtung zur Herstellung von Vorformrohlingen für dieselben
US4571977A (en) 1981-09-22 1986-02-25 Hitachi, Ltd. Method of forging flanged shaft
JP2005040842A (ja) * 2003-07-24 2005-02-17 Uk:Kk 中空段付軸の成形方法
DE10352664B4 (de) * 2003-11-11 2007-01-18 Cdp Bharat Forge Gmbh Schmiedeteil sowie Schmiedevorrichtung und Verfahren zu dessen Herstellung

Also Published As

Publication number Publication date
WO2008074279A1 (fr) 2008-06-26
DE502007003804D1 (de) 2010-06-24
EP2106309A1 (fr) 2009-10-07
ATE467472T1 (de) 2010-05-15
DE102006060020A1 (de) 2008-06-26
ES2356327T3 (es) 2011-04-07

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