EP2197606B1 - Verfahren zur herstellung hohler schmiedeteile - Google Patents

Verfahren zur herstellung hohler schmiedeteile Download PDF

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Publication number
EP2197606B1
EP2197606B1 EP08840711A EP08840711A EP2197606B1 EP 2197606 B1 EP2197606 B1 EP 2197606B1 EP 08840711 A EP08840711 A EP 08840711A EP 08840711 A EP08840711 A EP 08840711A EP 2197606 B1 EP2197606 B1 EP 2197606B1
Authority
EP
European Patent Office
Prior art keywords
core
blank
forging
gas discharge
positioning
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.)
Ceased
Application number
EP08840711A
Other languages
English (en)
French (fr)
Other versions
EP2197606A2 (de
Inventor
Hervé Muller
François DEGUY
Mikaël PUGNET
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.)
C2FT
Original Assignee
C2FT
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Filing date
Publication date
Application filed by C2FT filed Critical C2FT
Publication of EP2197606A2 publication Critical patent/EP2197606A2/de
Application granted granted Critical
Publication of EP2197606B1 publication Critical patent/EP2197606B1/de
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21KMAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00Making hollow articles not covered by a single preceding sub-group
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/002Hybrid process, e.g. forging following casting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02Die forging; Trimming by making use of special dies ; Punching during forging
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/10Cores; Manufacture or installation of cores
    • B22C9/106Vented or reinforced cores

Definitions

  • the present invention relates to the technical field of manufacturing metal parts subjected to a forging operation.
  • the object of the invention finds particularly advantageous applications for producing metal parts such as aluminum alloy in order to produce parts for the field for example of the cycle or automobile such as connecting rods, suspension wishbones, pivots, transmission parts, engine mounts or any other ground connection parts.
  • the document EP 0 850 825 proposes to make a core material lost to form the hollow part of a bicycle pedal crank.
  • This core is extended by a support portion for positioning the support within a casting mold in which a metal is cast. Before a subsequent forging operation, the support portion of the core and the portion of the core defining the receiving bore are removed. Even if such a technique reduces the amount of material used, this technique is unsatisfactory in practice because it does not ensure the good stability of the core during the forging operation. In addition, this technique requires the removal of a portion of the core prior to the forging operation. In addition to the disadvantages of this operation, It can not be ruled out that core debris can be found on forging tools, which can cause surface defects on the part.
  • the present invention therefore aims to overcome the disadvantages mentioned above by providing a method to benefit from the advantages of the forging process of a part while allowing to obtain a piece of optimized weight at a reduced cost.
  • Another object of the invention is to provide a method for producing a hollow forged part whose dimensional characteristics are perfectly controlled.
  • Another object of the invention is to provide a method for simply and inexpensively producing a hollow forging without surface defects likely to appear during the forging operation.
  • the method according to the invention aims at producing a hollow forged part.
  • the method consists in providing the core with at least one gas evacuation duct.
  • the method consists in ensuring the positioning of the core in the mold by means of the gas evacuation duct.
  • the method consists in sealing the blank by closing off each gas discharge duct.
  • the method consists in closing off each gas discharge duct with the aid of a stiffening element filling said duct.
  • the method consists in positioning the gas evacuation pipe in the core in a place intended to constitute a housing for the part.
  • the method consists in positioning the gas evacuation pipe so that it extends projecting on either side of the core so as to constitute a housing through the room.
  • the method consists of preheating the blank before it is forged.
  • the object of the invention is to ensure the manufacture of a hollow forged part 1 .
  • the piece 1 is a hoe comprising a body or arm 2 provided at each end of a head 3 of cylindrical shape.
  • Each head 3 is provided with a through bore 4 opening on two opposite lateral faces 5.
  • the bores 4 extend along axes parallel to each other and perpendicular to the direction of extension of the arm 2. that this is clear from the Fig. 1 , the body 2 is hollow insofar as it has a recess 7 opening into the bores 4 of the two heads 3.
  • the piece 1 is obtained according to the manufacturing method according to the invention which aims to provide a molding operation on a core of lost material to obtain a blank then subjected to a forging operation.
  • the method of the invention is to provide a core 10 in a lost material whose external shape corresponds to the inner shape of the workpiece 1 to obtain deformation near sustained during a subsequent operation of forging which will be described precisely in the following description.
  • the core 10 is made according to all the known methods using lost materials.
  • the core 10 is a salt core, a sand core made using a cold or hot box or "croning".
  • the core consists of sand and resin.
  • the core 10 is full.
  • the core is adapted to have sufficient mechanical strength during the subsequent forging operation.
  • the core 10 is adapted to withstand the stresses experienced during the forging operation.
  • the core 10 is provided with at least one gas evacuation duct 11.
  • the core 10 is provided with two gas evacuation conduits 11.
  • Each gas evacuation duct is made for example by a tube 11 pierced with holes 12 and inserted at least partly inside the core.
  • Each duct 11 protrudes from the core 10.
  • These ducts 11 are intended to evacuate the gases out of the mold, during the molding operation. These gases can come from the combustion of the resins forming part of the core 10.
  • the outer surface of the core 10 can be made impermeable, for example by coating to force the gases to exit through the conduits. 11.
  • each gas evacuation duct 11 is positioned in the core 10 in a place intended to constitute the bore 4 for the part.
  • each duct 11 is placed so that its axis of symmetry coincides with the axis of the bore 4 in which the duct is placed.
  • each gas evacuation duct 11 ensures the positioning of the core 10 in the mold during the molding operation.
  • each gas evacuation duct 11 protrudes on either side of the core, that is to say from the lateral faces 5.
  • the method consists in providing a molding operation on the core 10 by means of a conventional casting process.
  • This foundry operation will not be described in detail because it is part of the technical knowledge of the skilled person and it can be implemented by any known foundry technique.
  • the core 10 and as it stands out more precisely from the Fig.4 is intended to be placed in a mold 15 of which only the lower part has been illustrated at the Fig. 4 .
  • the gas discharge ducts 11 serve to position the core 10 inside the mold 15.
  • the mold is of any type and may be a sand mold, a metal shell or any another molding method for producing a preform to be forged.
  • the method therefore consists in ensuring the casting of a metal around the core 10 to completely envelop it in order to obtain a blank 18 as illustrated in FIG. Fig. 5 .
  • the core 10 is completely wrapped except the exhaust ducts 11 when they are present.
  • the method according to the invention aims to seal the blank 18 so that the core 10 is completely isolated vis-à-vis the external environment.
  • the sealing of the blank 18 is ensured by sealing each gas evacuation duct 11 with a closure element 20 of all types ( Fig. 6 ) .
  • This closure member 20 can be made in any suitable manner by a metal plug, resin, plastic or ceramic. In this way, the core 10 is not in contact with the air.
  • the method consists in closing off each gas evacuation duct 11 with the aid of a stiffening element 20 filling the duct.
  • this element 20 may be a rod or a metal shaft completely filling each gas discharge duct 11. This element makes it possible to stiffen and seal each gas evacuation duct 11.
  • the method according to the invention is then to ensure the forging of the blank 18 to obtain the piece to the desired shape.
  • This forging operation is performed either cold or hot.
  • the blank 18 is preheated before being placed as illustrated in FIG. Fig. 7 , In a matrix 22 of a forging press.
  • the blank 18 is thus positioned between the two dies of a forging press of all known types.
  • the core 10 still present in the blank 18, makes it possible to ensure against-pressure avoiding a collapse of the part at the recess 7, during the striking operation.
  • the core 10 thus ensures a level of compression adapted to obtain good mechanical strength characteristics. It should be noted that the presence of the metal pins 20 inside the core 10 also contributes to the strength of the core.
  • the piece 1 is removed from the dies as illustrated in FIG. Fig. 8 . If the piece 1 has a burr 22 due to the forging operation, then this burr 22 is removed.
  • the method according to the invention then consists in ensuring the breaking of the core 10 of the part 1 to obtain the hollow forging.
  • This stripping operation may be performed by any appropriate means such as drilling, vibration and / or heat treatment to remove the entire core 10. For example, it may be envisaged to drill at the heads 3 in order to get bores 4 ( Fig. 9 ) and a heat treatment to remove the core located in the arm 2 to obtain the recess 7. After the total removal of the core 10, the hollow part 1 is obtained ( Fig. 1 ).
  • the method according to the invention makes it possible to obtain a hollow forged part.
  • the part 1 is a connecting rod. It is clear that the object of the invention can be implemented for different parts with various shapes with one or more opening recesses.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Claims (8)

  1. Verfahren zur Herstellung von hohlen Schmiedeteilen (1), dadurch gekennzeichnet, daß es die folgenden Schritte umfaßt:
    - Herstellen eines Kerns (10) aus Einwegmaterial, dessen Form der Innenform des zu erhaltenden Teils, bis auf die während des Schmiedens erfahrene Verformung, entspricht,
    - Positionieren des Kerns (10) in einer Gußform,
    - Formen eines Metalls um den Kern (10) herum, um den Kern - für den Erhalt eines Rohlings (18) - vollständig zu umhüllen,
    - Abdichten des Rohlings (18), so daß der Kern (10) vollständig gegenüber der Außenseite isoliert ist,
    - Schmieden des Rohlings (18), um das Teil mit der gewünschten Form zu erhalten, und
    - Entfernen des Kerns (10) aus dem Teil, um das hohle Schmiedeteil (1) zu erhalten.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß es darin besteht, den Kern (10) mit wenigstens einer Gasabzugsleitung (11) zu versehen.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß es darin besteht, das Positionieren des Kerns (10) in der Form mit Hilfe der Gasabzugsleitung (11) sicherzustellen.
  4. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß es darin besteht, die Dichtigkeit des Rohlings (18) dadurch sicherzustellen, daß jede Gasabzugsleitung (11) verschlossen wird.
  5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß es darin besteht, jede Gasabzugsleitung (11) mit Hilfe eines die Leitung ausfüllenden Versteifungselements (20) zu verschließen.
  6. Verfahren nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß es darin besteht, die Gasabzugsleitung (11) in dem Kern (10) an einer Stelle zu positionieren, die dazu bestimmt ist, eine Aufnahme (4) für das Teil zu bilden.
  7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß es darin besteht, die Gasabzugsleitung (11) zu positionieren, damit sie sich auf beiden Seiten des Kerns derart vorspringend erstreckt, daß eine durchgehende Aufnahme (4) in dem Teil gebildet wird.
  8. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß es darin besteht, das Vorerhitzen des Rohlings (18) vor dessen Schmieden sicherzustellen.
EP08840711A 2007-09-28 2008-09-26 Verfahren zur herstellung hohler schmiedeteile Ceased EP2197606B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0757922A FR2921574B1 (fr) 2007-09-28 2007-09-28 Procede de fabrication de pieces forgees creuses et pieces ainsi obtenues
PCT/FR2008/051720 WO2009050382A2 (fr) 2007-09-28 2008-09-26 Procede de fabrication de pieces forgees creuses et pieces ainsi obtenues

Publications (2)

Publication Number Publication Date
EP2197606A2 EP2197606A2 (de) 2010-06-23
EP2197606B1 true EP2197606B1 (de) 2011-09-21

Family

ID=39321470

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08840711A Ceased EP2197606B1 (de) 2007-09-28 2008-09-26 Verfahren zur herstellung hohler schmiedeteile

Country Status (5)

Country Link
EP (1) EP2197606B1 (de)
CN (1) CN101808762B (de)
AT (1) ATE525151T1 (de)
FR (1) FR2921574B1 (de)
WO (1) WO2009050382A2 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2958193B1 (fr) 2010-04-06 2012-06-29 Saint Jean Ind Procede de fabrication de pieces forgees en alliage leger incorporant des sections pleines ou tirees d'epaisseur
FR2969516B1 (fr) * 2010-12-23 2013-08-16 Saint Jean Ind Procede de fabrication de noyau de sel par compaction isostatique uilisable en fonderie ou en fonderie-forgeage
CN106925720A (zh) * 2017-04-17 2017-07-07 大连旅桑实业有限公司 一种用于铸造长手臂型铸件的砂型模具
CN111842749A (zh) * 2020-07-13 2020-10-30 中国船舶工业集团公司第七0八研究所 一种通用的船用钢结构的制作方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1938526A1 (de) * 1969-07-29 1971-02-18 Ideal Standard Verfahren zur Herstellung von Kernen mit Entlueftungskanaelen
JPS5554259A (en) * 1978-10-18 1980-04-21 Hitachi Metals Ltd Mold casting method
JPS56114554A (en) * 1980-02-13 1981-09-09 Hitachi Metals Ltd Mold
JPS6076249A (ja) * 1983-09-30 1985-04-30 Toyota Motor Corp 砂中子
JPH05146841A (ja) * 1991-11-27 1993-06-15 Toyota Motor Corp 鍛造方法
JP3248676B2 (ja) * 1996-12-27 2002-01-21 株式会社シマノ 自転車用クランクとその製造方法
JP3149374B2 (ja) * 1996-12-27 2001-03-26 株式会社シマノ 自転車用中空クランクとその製造方法
CN1057716C (zh) * 1997-02-18 2000-10-25 曾绍谦 能简易取出心轴的冷锻用模心装置及其使用方法

Also Published As

Publication number Publication date
WO2009050382A2 (fr) 2009-04-23
FR2921574B1 (fr) 2010-04-16
ATE525151T1 (de) 2011-10-15
FR2921574A1 (fr) 2009-04-03
CN101808762A (zh) 2010-08-18
CN101808762B (zh) 2013-02-20
WO2009050382A3 (fr) 2009-06-11
EP2197606A2 (de) 2010-06-23

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