WO1999058273A1 - Procede permettant de produire des trous dans des metaux frittes, notamment des trous longs ou irreguliers dans des materiaux usines - Google Patents

Procede permettant de produire des trous dans des metaux frittes, notamment des trous longs ou irreguliers dans des materiaux usines Download PDF

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Publication number
WO1999058273A1
WO1999058273A1 PCT/SE1999/000673 SE9900673W WO9958273A1 WO 1999058273 A1 WO1999058273 A1 WO 1999058273A1 SE 9900673 W SE9900673 W SE 9900673W WO 9958273 A1 WO9958273 A1 WO 9958273A1
Authority
WO
WIPO (PCT)
Prior art keywords
core
brittle
pressing
holes
plastic deformation
Prior art date
Application number
PCT/SE1999/000673
Other languages
English (en)
Inventor
Hans Göran OHLSSON
Lars Bertil Ekbom
Original Assignee
Kennametal Inc.
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 Kennametal Inc. filed Critical Kennametal Inc.
Publication of WO1999058273A1 publication Critical patent/WO1999058273A1/fr

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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B22F2005/103—Cavity made by removal of insert

Definitions

  • the present invention relates to a method to, in components of sinter metal, make holes or cavities.
  • the powder is compressed in a tool to the shape desired and is afterwards sintered to a solid body.
  • cavities of different shapes can be made by a suitable design of the tool.
  • Such holes have limitations in their shape depending on that a certain conicity must be used to release the tool. This limits the length/diameter relation of the holes as well as their shape. Holes of this kind, as well as perpendicular holes, are therefore made in a subsequent machining operation.
  • SE patent 371 984 (7213140-2), that for alloys, difficult to machine, produced by powder technique, a core of a suitable material has been used. Halves of the core are placed on a disc and two tool halves are produced by filling powder in a form around the core halves. The tool can also be formed so that a core is inserted in a form, which corresponds to the shape of the final tool, and the form is filled with powder. After isostatic pressing the tool halves are taken apart and the core is removed. According to this patent the possibility to crush the core after sintering and afterwards in a simple way remove the core is not utilized.
  • metal powder is enclosed in a gas tight capsule together with a core of graphite, boron nitride or similar ceramic material and the capsule is isostatically pressed. After that the core is removed by blasting. Not eather in this case the patent uses the possibility to crush the core introduced to be able to remove it easily.
  • Drilling with a hard metal drill may be possible in sintered material, but difficulties will arise in harder and plastically deformed material. The hard metal drill will break.
  • One method may therefore be to performed the drilling in sintered material, insert a soft steel bar or similar in the hole, perform the plastic deformation and then drill out the relatively soft steel bar. The method has however been found difficult to perform and will be expensive.
  • pressing and sintering of the component usually must be performed in two or more pieces, where the cavity is formed at the pressing. After sintering the pieces are joined together by welding, brazing or some other method. This is complicated and expensive. Furthermore the joining may be troublesome.
  • the invention is ment to produce a cavity in the sintered component by using a brittle core of e.g. glass or a porous ceramic material, which, through a suitable form of plastic deformation or pressing, is crushed.
  • the crushed core can afterwards easily be removed and leaves in this way the cavity desired in the sintered body.
  • Fig. 1 The principle of the method (Fig. 1) is that in the cylindrical body of sintered metal (1) shown, at the powder pressing insert a core (2) of a brittle material of a kind that will retain its shape during the sintering. After pressing the component is sintered according to conventionel routine. At the following plastic deformation the brittle core will be crushed. Alternatively a brittle, porous core can be used, which is crushed at a subsequent pressing. The crushed core, usually as a powder, can now easily be removed, normally poured out.
  • Fig. 1 shows a sinter component ( 1 ) in which has been inserted a cylindrical body (2) of a brittle material.
  • Fig. 2 shows a sinter component ( 1 ) in which has been inserted an irregular body (2) of a brittle material.
  • the core of a brittle material can be inserted in different ways. Usually it is preferable to insert the core at the pressing of the metal powder to a so called green compact. Alternatively the core can be inserted in a hole drilled into the green compact. After that sintering is performed. The material in the core must withstand the sintering temperature without changing its shape to much and must not react with the sinter metal. An other alternative is to, after the sintering, insert the core in a hole drilled in the sintered metal. After that plastic deformation such as swaging or forging is performed. Alternatively can, if a porous core is used, pressing such as isostatic pressing be used.
  • the material in the core can be glass or some form of ceramic material.
  • materials with moderate sintering temperatures ordinary sodium glass can be used but at higher sintering temperatures quartz glass ought to be used.
  • ceramic materials porcelain and aluminium oxid may be mentioned. They shall be porous to be crushed easily at the deformation. This is especially the case if o pressing operation is used to crush the core.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

L'invention concerne un procédé permettant de produire des trous dans des métaux frittés en relation avec leur déformation plastique comme le feuilletage ou le forgeage ou en combinaison avec le pressage. Ce procédé est particulièrement avantageux quand il s'agit de produire des trous allongés de faible diamètre comparé à leur longueur ou des cavités irrégulières. Lors de la réalisation des trous, on utilise un noyau qui est réalisé dans un corps fragile comme du verre ou une céramique poreuse, et qui est inséré dans le métal fritté. Ce noyau de forme quelconque est broyé lors de la déformation plastique ou du pressage. Le noyau broyé, habituellement en poudre, peut être facilement retiré ou évacué après la déformation du plastique. Ce procédé présente un avantage particulier en relation avec le frittage puisque le noyau fragile peut être introduit en relation avec la consolidation de la poudre puis participer au procédé de frittage. Le noyau fragile est broyé lors de la déformation plastique ou du pressage consécutif.
PCT/SE1999/000673 1998-05-12 1999-04-27 Procede permettant de produire des trous dans des metaux frittes, notamment des trous longs ou irreguliers dans des materiaux usines WO1999058273A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9801633-0 1998-05-12
SE9801633A SE519139C2 (sv) 1998-05-12 1998-05-12 Metod att bilda hål eller håligheter i sintrade och bearbetade metallföremål

Publications (1)

Publication Number Publication Date
WO1999058273A1 true WO1999058273A1 (fr) 1999-11-18

Family

ID=20411252

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1999/000673 WO1999058273A1 (fr) 1998-05-12 1999-04-27 Procede permettant de produire des trous dans des metaux frittes, notamment des trous longs ou irreguliers dans des materiaux usines

Country Status (2)

Country Link
SE (1) SE519139C2 (fr)
WO (1) WO1999058273A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009115821A1 (fr) * 2008-03-20 2009-09-24 Advanced Interactive Materials Science Limited Procédé de compression isostatique de poudre à finition immédiate ou à finition presque immédiate
EP2279324B1 (fr) * 2008-03-20 2014-05-21 Advanced Interactive Materials Science Limited Stator pour moteur hélicoïdal

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE143762C1 (fr) *
US4777710A (en) * 1987-04-23 1988-10-18 Polymet Corporation Apparatus and method used in making wire and similar elongate members and wire made using same
SE470521B (sv) * 1992-11-16 1994-07-04 Erasteel Kloster Ab Sätt vid pulvermetallurgisk framställning av en kropp
WO1995032819A1 (fr) * 1994-05-30 1995-12-07 Anval Nyby Powder Ab Fabrication de fil fortement allie

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE143762C1 (fr) *
US4777710A (en) * 1987-04-23 1988-10-18 Polymet Corporation Apparatus and method used in making wire and similar elongate members and wire made using same
SE470521B (sv) * 1992-11-16 1994-07-04 Erasteel Kloster Ab Sätt vid pulvermetallurgisk framställning av en kropp
WO1995032819A1 (fr) * 1994-05-30 1995-12-07 Anval Nyby Powder Ab Fabrication de fil fortement allie

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009115821A1 (fr) * 2008-03-20 2009-09-24 Advanced Interactive Materials Science Limited Procédé de compression isostatique de poudre à finition immédiate ou à finition presque immédiate
US20110033725A1 (en) * 2008-03-20 2011-02-10 Geoffrey Frederick Archer Net-shape or near net-shape powder isostatic pressing process
CN102026752A (zh) * 2008-03-20 2011-04-20 先进交互式材料科学有限公司 净成形或近净成形粉末等静压方法
EA019527B1 (ru) * 2008-03-20 2014-04-30 Адвансд Интерэктив Материалз Сайнс Лимитед Способ изостатического прессования порошка в окончательную или близкую к окончательной форму
EP2279324B1 (fr) * 2008-03-20 2014-05-21 Advanced Interactive Materials Science Limited Stator pour moteur hélicoïdal

Also Published As

Publication number Publication date
SE9801633D0 (sv) 1998-05-12
SE9801633L (sv) 1999-11-13
SE519139C2 (sv) 2003-01-21

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