EP1213367A1 - Verfahren zur Herstellung von Gussteilen aus Leichtmetall-Legierungen mit Kühlung vor dem Pressen - Google Patents

Verfahren zur Herstellung von Gussteilen aus Leichtmetall-Legierungen mit Kühlung vor dem Pressen Download PDF

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Publication number
EP1213367A1
EP1213367A1 EP01402944A EP01402944A EP1213367A1 EP 1213367 A1 EP1213367 A1 EP 1213367A1 EP 01402944 A EP01402944 A EP 01402944A EP 01402944 A EP01402944 A EP 01402944A EP 1213367 A1 EP1213367 A1 EP 1213367A1
Authority
EP
European Patent Office
Prior art keywords
pressing
light alloy
alloy
parts
temperature
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.)
Granted
Application number
EP01402944A
Other languages
English (en)
French (fr)
Other versions
EP1213367B1 (de
Inventor
Arnault Marchal
Dominique Rezel
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.)
Process Conception Ingenierie SA
Original Assignee
Process Conception Ingenierie SA
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 Process Conception Ingenierie SA filed Critical Process Conception Ingenierie SA
Publication of EP1213367A1 publication Critical patent/EP1213367A1/de
Application granted granted Critical
Publication of EP1213367B1 publication Critical patent/EP1213367B1/de
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
    • 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
    • B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
    • 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
    • B21J5/002—Hybrid process, e.g. forging following casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
    • B22D31/002—Cleaning, working on castings
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon

Definitions

  • the present invention relates to a method for production of castings made of an alloy light, especially in aluminum alloy.
  • the parts cast by molding in a sand mold or metallic have a coarse eutectic structure, porosities or inclusions and mainly gas inclusions, and a rough surface finish.
  • Document FR-2 614 814 describes a process of this type in which the pressing operation is carried out cold or at low temperature, the matrix prints showing dimensions slightly smaller than those of the room.
  • This additional step provides castings with better performance mechanical, especially in terms of elongation and tensile strength.
  • document EP-816,042 provides for a cooling and solidification of the part in the mold, the molded part then being subjected to a heating step to obtain liquefaction partial of the alloy, especially at a temperature between 500 and 550 ° C.
  • This reheating facilitates the flow of crystals and therefore provides a homogeneous distribution, this which also helps to improve the properties mechanics of the casting obtained.
  • the object of the invention is to overcome these disadvantages by proposing a process, very simplified by compared to the processes currently used, this process also allowing parts to be obtained, the mechanical characteristics are optimized.
  • the invention relates to a method for manufacture castings, made of light alloy, which consists of filling a mold with a light alloy to liquid state, to unmold the part after solidification and pressing the part in between footprints of a matrix.
  • this process includes a step intermediate produced after demolding and before pressing, this intermediate step consisting of rapidly cool the molded part, so that obtain a homogeneous structure, the pressing then being performed at room temperature.
  • the invention therefore stands out completely from currently used processes in which the parts are hot pressed, during molding or forging.
  • the parts are cold pressed, as in more technical old illustrated for example in document FR-2 614 814 and, moreover, the molded part is cooled quickly and therefore undergoes a quenching treatment before pressing.
  • This rapid cooling provides a part of homogeneous structure, thanks to the dissolution of the alloy resulting from the casting process.
  • the method according to the invention uses a property particular of light alloys, among others aluminum, in the quenched state: these have a very good forging or forming ability due to increased ductility.
  • a light alloy and hardened casting has a ductile structure and can be formed cold.
  • the predetermination of dimensions of the final piece is easily achievable by means of modeling simple numerical (calculation in the field of forging cold, depending on the elastoplastic behavior of the material without the need to take effect into account thermal).
  • the part obtained by this type of forming presents dimensional accuracy as well as a surface condition, a structure of matter and a reduction of porosities or inclusions very significantly improved by compared to a part obtained by hot forging.
  • the process according to the invention hardens the grains on the surface, refines and fiber the structure, which improves the resistance in room service.
  • the surface finish can be assessed using the roughness. Measurements made on parts obtained by the method according to the invention have given a value about 1.5 ⁇ m. For comparison, the roughness of a gross foundry part is between 8 and 10 ⁇ m while that obtained by a process of the type described in EP-199 365 or EP-955 113 is approximately 3 ⁇ m.
  • cold forging presents another significant advantage compared to hot forging, since it reduces the mass of metal required to get the finished piece.
  • the application of pressure has intended to move the material to close areas of discontinuity due to inclusions.
  • burrs which are used in particular for the regulation of these flows during forging, are greater at hot than cold.
  • the part After pressing between the two cavities of the die, the part can be kept at temperature room. It is an aging treatment in natural atmosphere (maturation).
  • the metal alloy then tends to find balance, a phenomenon which is responsible for structural hardening by temperature maturation room.
  • the part is subject to income treatment.
  • Such income processing accelerates the return to alloy balance and it translates generally by a more severe hardening of the alloy.
  • the imprints of the matrix can have dimensions slightly smaller than those of the mold which allows to obtain, during pressing, a core pressing and wrought.
  • the part is cast at a temperature T 1 at which the alloy is in liquid form, then the part is solidified to a lower temperature T 2 .
  • the temperature T 1 is between 740 and 760 ° C.
  • period B the quenching treatment is carried out, the temperature of the part changing from temperature T 2 to ambient temperature.
  • the process continues during period D, by a tempering treatment, the part is then heated to a temperature T 3 .
  • This income treatment optimizes the mechanical characteristics by precipitation of alloying elements, in particular in the case of alloys aluminum.
  • Tempering temperatures are included typically between 80 ° C and 200 ° C, depending on the shade for aluminum alloys.
  • the temperature T 3 is preferably between 80 ° C and 140 ° C.
  • the method according to the invention avoids any heat treatment while improving mechanical characteristics of the parts obtained.
  • the method according to the invention does not require reheating of parts and temperature maintenance before forging.
  • income treatment can be used to get rid of the time required for maturation.
  • income processing lasts between 1 and 3 hours and takes place at a temperature between 80 ° C and 200 ° C.
  • the process according to the invention leads to a very high reduction of the manufacturing cycle (around 10 hours) and energy consumption (around 85%).
  • the method according to the invention also results in a reduction in the number of treatment facilities thermal.
  • the implementation of the process according to the invention will require two ovens and that of a process of the EP-955 113 type will require four ovens.

Landscapes

  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Forging (AREA)
  • Continuous Casting (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP01402944A 2000-11-17 2001-11-16 Verfahren zur Herstellung von Gussteilen aus Leichtmetall-Legierungen mit Kühlung vor dem Pressen Expired - Lifetime EP1213367B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0014856 2000-11-17
FR0014856A FR2816858B1 (fr) 2000-11-17 2000-11-17 Procede de fabrication de pieces en alliages metalliques, avec un refroidissement avant pressage

Publications (2)

Publication Number Publication Date
EP1213367A1 true EP1213367A1 (de) 2002-06-12
EP1213367B1 EP1213367B1 (de) 2008-05-28

Family

ID=8856590

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01402944A Expired - Lifetime EP1213367B1 (de) 2000-11-17 2001-11-16 Verfahren zur Herstellung von Gussteilen aus Leichtmetall-Legierungen mit Kühlung vor dem Pressen

Country Status (4)

Country Link
EP (1) EP1213367B1 (de)
AT (1) ATE397102T1 (de)
DE (1) DE60134207D1 (de)
FR (1) FR2816858B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2386576A (en) * 2002-03-06 2003-09-24 Adcock Tech Ltd Deforming a component with a die tool
FR2864459A1 (fr) * 2003-12-24 2005-07-01 Peugeot Citroen Automobiles Sa Procede de fabrication de pieces en alliage leger avec un refroidissement avant pressage et sans bavures
WO2009006939A1 (de) * 2007-07-09 2009-01-15 Bharat Forge Aluminiumtechnik Gmbh & Co. Kg Giessen-schmieden von knetlegierungen
EP2286941A1 (de) * 2009-07-30 2011-02-23 Benteler Automobiltechnik GmbH Fahrwerksbauteil für ein Kraftfahrzeug und Verfahren zur Herstellung
EP2332671A1 (de) * 2009-11-24 2011-06-15 Benteler Automobiltechnik GmbH Verfahren zur Herstellung eines Kraftfahrzeugbauteils

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1711000A (en) * 1925-07-02 1929-04-30 Gen Motors Res Corp Method of making wrought-metal articles
EP0119365A1 (de) * 1983-03-14 1984-09-26 Thomas Di Serio Verfahren zur Herstellung von Stücken aus Aluminium oder Aluminiumlegierung
US4775426A (en) * 1986-04-03 1988-10-04 Richards Medical Company Method of manufacturing surgical implants from cast stainless steel and product
FR2614814A3 (fr) * 1987-05-04 1988-11-10 Serio Thomas Di Procede pour fabriquer des pieces en aluminium, alliages divers et tous alliages en general
EP0816042A1 (de) * 1996-07-03 1998-01-07 GUIDO BAGGIOLI S.N.C. DI BAGGIOLI GIUSEPPE & PELLEGRINI CLEMENTINA Verfahren zum Herstellen von Legierungsgussstücken
EP0955113A1 (de) * 1998-05-04 1999-11-10 Emile Di Serio Verfahren zum Herstellen von Stücken aus Gusslegierungen , insbesondere aus Aluminium

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1711000A (en) * 1925-07-02 1929-04-30 Gen Motors Res Corp Method of making wrought-metal articles
EP0119365A1 (de) * 1983-03-14 1984-09-26 Thomas Di Serio Verfahren zur Herstellung von Stücken aus Aluminium oder Aluminiumlegierung
US4775426A (en) * 1986-04-03 1988-10-04 Richards Medical Company Method of manufacturing surgical implants from cast stainless steel and product
FR2614814A3 (fr) * 1987-05-04 1988-11-10 Serio Thomas Di Procede pour fabriquer des pieces en aluminium, alliages divers et tous alliages en general
EP0816042A1 (de) * 1996-07-03 1998-01-07 GUIDO BAGGIOLI S.N.C. DI BAGGIOLI GIUSEPPE & PELLEGRINI CLEMENTINA Verfahren zum Herstellen von Legierungsgussstücken
EP0955113A1 (de) * 1998-05-04 1999-11-10 Emile Di Serio Verfahren zum Herstellen von Stücken aus Gusslegierungen , insbesondere aus Aluminium

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2386576A (en) * 2002-03-06 2003-09-24 Adcock Tech Ltd Deforming a component with a die tool
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
FR2864459A1 (fr) * 2003-12-24 2005-07-01 Peugeot Citroen Automobiles Sa Procede de fabrication de pieces en alliage leger avec un refroidissement avant pressage et sans bavures
EP1550522A1 (de) * 2003-12-24 2005-07-06 Peugeot Citroen Automobiles SA Verfahren zur Herstellung von gratfreien Werkstücken aus Leichtmetall-Legierung mit Kühlung vor dem Pressen
WO2009006939A1 (de) * 2007-07-09 2009-01-15 Bharat Forge Aluminiumtechnik Gmbh & Co. Kg Giessen-schmieden von knetlegierungen
EP2286941A1 (de) * 2009-07-30 2011-02-23 Benteler Automobiltechnik GmbH Fahrwerksbauteil für ein Kraftfahrzeug und Verfahren zur Herstellung
EP2332671A1 (de) * 2009-11-24 2011-06-15 Benteler Automobiltechnik GmbH Verfahren zur Herstellung eines Kraftfahrzeugbauteils

Also Published As

Publication number Publication date
FR2816858A1 (fr) 2002-05-24
EP1213367B1 (de) 2008-05-28
ATE397102T1 (de) 2008-06-15
DE60134207D1 (de) 2008-07-10
FR2816858B1 (fr) 2003-07-11

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