EP0968068A1 - Adjuvant de compactage pour produire des pieces moulees frittables a partir d'une poudre de metal - Google Patents

Adjuvant de compactage pour produire des pieces moulees frittables a partir d'une poudre de metal

Info

Publication number
EP0968068A1
EP0968068A1 EP98964406A EP98964406A EP0968068A1 EP 0968068 A1 EP0968068 A1 EP 0968068A1 EP 98964406 A EP98964406 A EP 98964406A EP 98964406 A EP98964406 A EP 98964406A EP 0968068 A1 EP0968068 A1 EP 0968068A1
Authority
EP
European Patent Office
Prior art keywords
pressing
pressing aid
metal powder
aid
mold
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
EP98964406A
Other languages
German (de)
English (en)
Other versions
EP0968068B1 (fr
Inventor
René LINDENAU
Klaus Dollmeier
Wieland Kynast
Jens Wahnschaffe
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.)
GKN Sinter Metals GmbH
Original Assignee
GKN Sinter Metals GmbH and Co KG
GKN Sinter Metals 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 GKN Sinter Metals GmbH and Co KG, GKN Sinter Metals GmbH filed Critical GKN Sinter Metals GmbH and Co KG
Publication of EP0968068A1 publication Critical patent/EP0968068A1/fr
Application granted granted Critical
Publication of EP0968068B1 publication Critical patent/EP0968068B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B22F2003/023—Lubricant mixed with the metal powder
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
    • E05Y2900/13—Type of wing
    • E05Y2900/132—Doors
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
    • E05Y2900/13—Type of wing
    • E05Y2900/148—Windows

Definitions

  • the density of the finished sintered molded part essentially depends on the green density achieved, and unlike in the compression of ceramic powders, the metal powder particles undergo plastic deformation due to their different crystalline structure and the associated number of movable lattice construction defects. Due to the particle geometry - also different from ceramic powders - the lubricity of the individual powder particles against each other is reduced in metallic powders, so that even the loose bed in the mold has a pore volume that is almost completely eliminated when pressing only with very high pressing pressures can be. However, high pressing pressures result in high wear on the pressing tool during the compression process and also lead to increased sliding friction of the finished green body in the pressing die, so that here too higher discharge forces with correspondingly increased wear have to be applied.
  • EP-A-0 375 627 proposed a method in which the metal powder to be pressed is mixed with a lubricant liquefied by a liquid solvent.
  • Metal stearates, in particular lithium or zinc stearates, and paraffins, waxes, natural or synthetic fat derivatives are proposed as lubricants for this purpose, which are first liquefied, for example, with organic paraffin solvents as the liquid solvent.
  • the disadvantage of this method is, on the one hand, that the dry metal powders first have to be mixed with a two-component lubricant system, namely the stearates and the solvent, this premixing having to be largely homogeneous.
  • Another disadvantage is that this powder mixture must be preheated to a relatively high level up to the softening point of the lubricant used before the mold is filled.
  • the lubricant After completing the pressing process and ejecting the green body, the lubricant must be evaporated in a separate process before the green body can then be heated to the actual sintering temperature. It cannot be avoided here that the remaining portions of the lubricant remain in the sintered body, which, depending on the intended use and the type of pure or alloyed Metc-.ll powder used, can also lead to disadvantages.
  • a metallurgical powder composition based on iron which contains an organic binder for the iron-based powder components and the alloy powder components.
  • the organic binder contains a proportion of polyalkylene oxide, which should have a molecular weight of at least 7000 g / mol, but much higher molecular weights are preferred.
  • the invention has for its object to improve the methods described above. This object is achieved with a method for producing sinterable metallic molded parts from a metal powder which has been mixed with a pressing aid which at least partially contains components from the family of the polyalkylene oxides and which is filled into a mold and after compression under pressure is ejected from the mold as a pressed molding.
  • pressing aids which contain at least portions from the family of the polyalkylene oxides, in particular the polyalkylene glycols, preferably the polyethylene oxides, in particular in the form of polyethylene glycols, has surprisingly shown that in order to achieve high densities and high green strengths, much lower compression pressures than are to be used with other pressing aids and that the forces necessary for ejecting the pressed molded part from the pressing mold are significantly reduced, so that the disadvantages of the previously known methods mentioned above are avoided.
  • a special binder in the powder mixture is not required, since, due to the "lubrication" of the powder particles moving relative to one another during the pressing process, not only a high density but also a high strength of the green body due to the much higher "packing density” of the powder particles and thus an increase direct contacts between the metal particles in the powder can be achieved.
  • a high green strength is always desirable if the green body is to be processed before sintering.
  • Metal powder in the sense of the invention refers to the powder mixture intended for the production of the molded part with all alloy and acid additives, with the exception of pressing aids.
  • a particular advantage of the pressing aids selected from the family of polyethylene oxides, in particular when they are used in the form of polyethylene glycols, is that an appropriate selection of the molecular weight can influence the pressing parameters, both with regard to the flow behavior when mixing and when filling the form, as well as in terms of softening point and thus the temperature control and the material flow during the pressing process. It is particularly advantageous if the pressing aid proposed according to the invention lies with its softening point between 40 ° C and 80 ° C, so that, for example, in series production, the tool temperature that arises during continuous pressing is usually sufficient to ensure that the powder mixture flows properly Filling into the mold as well as during pressing. Accordingly, the metal powder mixed with the molding aid can be filled into the mold at room temperature.
  • the further advantage of the low softening temperature is that immediately after the filling, the pressing aid portions in the amounts of metal powder in contact with the heated mold walls are theirs
  • P P- G C cn P- G G tr tr s: M G P- tr rt ⁇ cn P tr • X5 ⁇ a P ⁇ G a
  • P- a P cn P G P a P ⁇ tr P- ⁇ P M ⁇ ⁇ tr cn rt P cn N P- o
  • curve 3 shows the result when using the method according to the invention, which leads to a clear increase in the final density.
  • N z ⁇ C w P y tr Pi ⁇ a z ⁇ G G ⁇ rt P G P- G P tr tr G tr C a tn a y ⁇
  • G a rt ⁇ . et P- ⁇ ⁇ et tr ⁇ rt G cn P- P y ⁇ ⁇ tr GG ⁇ P- tr P- ⁇ o cn tr y rt tr ⁇ et P- p: et G tr ⁇ tr y ⁇ J ya ⁇ PG rt y to ⁇ rt P- ⁇ ⁇ P>
  • Table 5 the values for the metal powder are shown as a reference, to which an amide wax was cold mixed as a pressing aid and which was cold pressed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)

Abstract

L'invention concerne un procédé pour produire des pièces métalliques moulées frittables à partir d'une poudre de métal à laquelle a été ajouté un adjuvant de compactage. Ce dernier contient au moins partiellement des constituants de la famille des polyalkylène glycols. La poudre de métal est placée dans le moule et compactée sous pression avant d'être déchargée du moule sous la forme d'une pièce compactée moulée.
EP98964406A 1997-11-28 1998-11-18 Adjuvant de compactage pour produire des pieces moulees frittables a partir d'une poudre de metal Expired - Lifetime EP0968068B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19752993 1997-11-28
DE19752993A DE19752993A1 (de) 1997-11-28 1997-11-28 Verfahren zur Herstellung von sinterbaren metallischen Formteilen aus einem Metallpulver
PCT/EP1998/007406 WO1999028069A1 (fr) 1997-11-28 1998-11-18 Adjuvant de compactage pour produire des pieces moulees frittables a partir d'une poudre de metal

Publications (2)

Publication Number Publication Date
EP0968068A1 true EP0968068A1 (fr) 2000-01-05
EP0968068B1 EP0968068B1 (fr) 2002-03-27

Family

ID=7850223

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98964406A Expired - Lifetime EP0968068B1 (fr) 1997-11-28 1998-11-18 Adjuvant de compactage pour produire des pieces moulees frittables a partir d'une poudre de metal

Country Status (12)

Country Link
US (1) US6224823B1 (fr)
EP (1) EP0968068B1 (fr)
JP (1) JP3386078B2 (fr)
KR (1) KR100341359B1 (fr)
AR (1) AR009920A1 (fr)
AT (1) ATE214988T1 (fr)
BR (1) BR9807116A (fr)
CA (1) CA2279275C (fr)
DE (2) DE19752993A1 (fr)
ES (1) ES2173662T3 (fr)
TW (1) TW434064B (fr)
WO (1) WO1999028069A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10101471A1 (de) * 2001-01-12 2002-07-25 Gkn Sinter Metals Gmbh Verfahren zur Herstellung eines gesinterten Bauteils mit überlagerten Schwingungen während des Preßvorgangs
DE10111325C1 (de) * 2001-03-08 2002-10-02 Gkn Sinter Metals Gmbh Verfahren zur Herstellung eines gesinterten metallischen Bauteils mit wenigstens einer Bohrung
SE0103398D0 (sv) * 2001-10-12 2001-10-12 Hoeganaes Ab Lubricant powder for powder metallurgy
US6689188B2 (en) * 2002-01-25 2004-02-10 Hoeganes Corporation Powder metallurgy lubricant compositions and methods for using the same
US6802885B2 (en) * 2002-01-25 2004-10-12 Hoeganaes Corporation Powder metallurgy lubricant compositions and methods for using the same
DE10244486A1 (de) * 2002-09-24 2004-04-01 Gkn Sinter Metals Gmbh Mischung zur Herstellung von gesinterten Formteilen
US7237730B2 (en) * 2005-03-17 2007-07-03 Pratt & Whitney Canada Corp. Modular fuel nozzle and method of making
US8316541B2 (en) * 2007-06-29 2012-11-27 Pratt & Whitney Canada Corp. Combustor heat shield with integrated louver and method of manufacturing the same
US7543383B2 (en) 2007-07-24 2009-06-09 Pratt & Whitney Canada Corp. Method for manufacturing of fuel nozzle floating collar
CA3079312C (fr) 2013-09-12 2022-05-17 National Research Council Of Canada Lubrifiant pour metallurgie des poudres et compositions de poudre metallique contenant ledit lubrifiant
EP3165302A1 (fr) 2015-11-03 2017-05-10 Wachs-Chemie Elsteraue e.K. Lubrifiant a base de cire de canne a sucre

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE427434B (sv) * 1980-03-06 1983-04-11 Hoeganaes Ab Jernbaserad pulverblandning med tillsats mot avblandning och/eller damning
US4485182A (en) * 1982-07-28 1984-11-27 Ibiden Kabushiki Kaisha Powder composition for producing sintered ceramic
US4595558A (en) * 1985-05-17 1986-06-17 Kerr-Mcgee Chemical Corporation Additive agents for use in the manufacture of molded particulate metal articles
DE4003219A1 (de) 1989-10-24 1991-08-08 Basf Ag Verfahren zur herstellung von formulierungen aus keramischen und/oder metallischen fasern
US5079198A (en) * 1990-07-24 1992-01-07 Eaton Corporation Ceramic phase in sintered silicon nitride containing cerium, aluminum, and iron
US5194203A (en) 1991-02-28 1993-03-16 Mitsui Mining & Smelting Co., Ltd. Methods of removing binder from powder moldings
US5328657A (en) * 1992-02-26 1994-07-12 Drexel University Method of molding metal particles
US5298055A (en) 1992-03-09 1994-03-29 Hoeganaes Corporation Iron-based powder mixtures containing binder-lubricant
DE69307172T2 (de) * 1992-03-16 1997-04-24 Kawasaki Steel Co Bindersystem für den Gebrauch beim Spritzgiessen von sinterfähigen Pulvern und dieses Bindersystem enthaltende Formmasse
US5308556A (en) * 1993-02-23 1994-05-03 Corning Incorporated Method of making extrusion dies from powders
US5432223A (en) 1994-08-16 1995-07-11 National Research Council Of Canada Segregation-free metallurgical blends containing a modified PVP binder
US5498276A (en) 1994-09-14 1996-03-12 Hoeganaes Corporation Iron-based powder compositions containing green strengh enhancing lubricants
US5782954A (en) 1995-06-07 1998-07-21 Hoeganaes Corporation Iron-based metallurgical compositions containing flow agents and methods for using same
JP2003526693A (ja) 1997-10-21 2003-09-09 ヘガネス・コーポレーシヨン 結合剤／潤滑剤を含有する改良された冶金用組成物及びその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9928069A1 *

Also Published As

Publication number Publication date
KR100341359B1 (ko) 2002-06-22
CA2279275C (fr) 2006-04-18
JP3386078B2 (ja) 2003-03-10
JP2000517004A (ja) 2000-12-19
WO1999028069A1 (fr) 1999-06-10
TW434064B (en) 2001-05-16
AR009920A1 (es) 2000-05-03
DE19752993A1 (de) 1999-06-02
ES2173662T3 (es) 2002-10-16
ATE214988T1 (de) 2002-04-15
CA2279275A1 (fr) 1999-06-10
KR20000070202A (ko) 2000-11-25
US6224823B1 (en) 2001-05-01
EP0968068B1 (fr) 2002-03-27
DE59803513D1 (de) 2002-05-02
BR9807116A (pt) 2000-04-25

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