EP0701875B1 - Procédé de préparation d'articles métalliques par moulage par injection - Google Patents

Procédé de préparation d'articles métalliques par moulage par injection Download PDF

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Publication number
EP0701875B1
EP0701875B1 EP95113801A EP95113801A EP0701875B1 EP 0701875 B1 EP0701875 B1 EP 0701875B1 EP 95113801 A EP95113801 A EP 95113801A EP 95113801 A EP95113801 A EP 95113801A EP 0701875 B1 EP0701875 B1 EP 0701875B1
Authority
EP
European Patent Office
Prior art keywords
sintered
shaped part
sintering
binder
parts
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.)
Expired - Lifetime
Application number
EP95113801A
Other languages
German (de)
English (en)
Other versions
EP0701875A1 (fr
Inventor
Hans-Josef Dr. Sterzel
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Publication of EP0701875A1 publication Critical patent/EP0701875A1/fr
Application granted granted Critical
Publication of EP0701875B1 publication Critical patent/EP0701875B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
    • 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
    • B22F3/10—Sintering 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
    • 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
    • B22F3/12—Both compacting and sintering
    • B22F3/1208—Containers or coating used therefor
    • B22F3/1258—Container manufacturing
    • B22F3/1283—Container formed as an undeformable model eliminated after consolidation
    • 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
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • 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
    • B22F3/10—Sintering only
    • B22F2003/1042—Sintering only with support for articles to be sintered
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Definitions

  • the present invention relates to an improved method for Manufacture of metallic molded parts by processing a Injection molding compound, where a.) The injection molding compound to the molded part processed and b.) part of the contained in the molded part Binder removed and c.) Sinters the molded part thus obtained.
  • the green bodies obtained in this way become subsequent debinding step from most of the binder exempted, with an acid catalytic debinding the
  • the advantage of this is the gentle removal of the binder to prevent the risk of cracking (page 2, lines 3 to 32).
  • the porous parts thus obtained are then at Temperatures of about 1100 to 1500 ° C sintered, possibly still small amounts of residual binder escape (page 2, Lines 33 to 34).
  • the process is used to manufacture inorganic sintered molded parts generally very suitable, but it can be, for example in the case of large parts, which may have complicated shapes and / or have thin walls, undesirable during sintering Deformations come.
  • the sintering process requires high temperatures, to set the desired structure in the molded body. Usually the temperatures are around 1100 to 1500 ° C. At these high temperatures can, however, soften the to be sintered molded body can not be excluded. This can For example, with cutlery parts, which during the sintering process plan documents are only very incomplete, too undesirable Deform because the molded body already his own weight experiences a considerable load.
  • the invention further relates to those obtainable with the method Molded parts.
  • the documents used in the method according to the invention ensure good dimensional stability during the sintering process of the molded part.
  • Documents that are particularly suitable advantageously approximately the contour of the finished molded part have a higher creep resistance than that Molded parts or in the sintering temperature range under the influence of Do not crawl the contact forces measurably.
  • the production of the base can be preferred for some molded parts directly using the mold for the metallic molding respectively. This is, for example, the case for the production of spoons the case.
  • the underlay be about 1 to 20% larger to dimension as the molded part, particularly preferably 2 to 10%.
  • the measures necessary to set the dimension are known to the person skilled in the art.
  • the shrinkage of the shaped body depends on the composition of the starting materials and can be varied accordingly. Furthermore can influenced by the sintering temperature on the shrinkage become, with increasing the sintering temperature becomes a stronger one Shrinkage of the molded part observed.
  • sinterable metal powder In a known manner, sinterable metal powder, flowable binder and any auxiliary materials that may be added a granulate made.
  • flowable binder There are numerous flowable binders Known fabrics. It is essential that when the temperature rises provide as little residual carbon as possible.
  • polyoxymethylene homo- or copolymers are known to the person skilled in the art known per se and described in the literature.
  • the homopolymers are generally polymerized by Formaldehyde or trioxane produced, preferably in the presence of suitable catalysts.
  • Polyoxymethylene copolymers preferred in the context of the invention contain, in addition to the repeating units -OCH 2 - up to 50, preferably 0.1-20 and in particular 0.3-10 mol% of repeating units.
  • R 1 to R 4 independently of one another are a hydrogen atom, a C 1 -C 4 alkyl group or a halogen-substituted alkyl group with 1-4 C atoms and R 5 is a -CH 2 -, -CH 2 O-, a by C 1 - C 4 alkyl or C 1 -C 4 haloalkyl substituted methylene group or a corresponding oxymethylene group and n has a value in the range 0-3.
  • cyclic ethers are those of the formula where R 1 -R 5 and n have the meaning given above. Only examples include ethylene oxide, 1,2-propylene oxide, 1,2-butylene oxide, 1,3-butylene oxide, 1,3-dioxane, 1,3-dioxolane and dioxepane as cyclic ethers and linear oligoformals as comonomers.
  • Preferred monomers of this type are ethylene diglycide, diglycidyl ether and Diether from glycidylene and formaldehyde, dioxane or Trioxane in a molar ratio of 2: 1 and diether from 2 mol of glycidyl compound and 1 mol of an aliphatic diol with 2-8 C atoms such as the diglyidyl ethers of ethylene glycol, 1,4-butanediol, 1,3-butanediol, cyclobutane-1,3-diol, 1,2-propanediol and cyclohexane-1,4-diol to name just a few examples.
  • the preferred polyoxymethylene homo- or copolymers Melting points of at least 150 ° C and molecular weights (Weight average) in the range of 5000 to 15000, preferably from 7000 to 60000.
  • Metals that can be contained in powder form are only for example called iron, cobalt, nickel and silicon; Alloys are e.g. iron-based alloys such as low and high alloys Steels, light metal alloys based on Aluminum and titanium as well as alloys with copper or bronze. Finally, there are also hard metals such as tungsten carbide and boron carbide or titanium nitride in combination with metals such as cobalt and Nickel into consideration. The latter can be used in the manufacture of metal-bound hard cutting tools (so-called cermets) become.
  • Flow aids, stabilizers, for example, are used as auxiliaries or mold release agents used.
  • the granulate is injection-molded in a known manner Green body made.
  • the granulate is in Injection molding machines at temperatures of about 120 to 220 ° C, preferred 170 to 200 ° C melted and the melt in the appropriate Mold injected where it is under temperature cools down and falls below the glass softening temperature and / or the crystallite melting point of the binder solidifies and then removed from the mold.
  • the green bodies obtained in this way are used in the subsequent debinding step at temperatures of around 90 to 600 ° C from one large part of the binder contained exempted.
  • This can debinding in the presence of an acid is also recommended, whereby lower when acidic catalytic cleavage of the binder Temperatures during debinding are made possible.
  • Suitable Acids are, for example, nitric acid, oxalic acid or Boron trifluoride; the temperatures are during the debinding here usually at about 110 to 150 ° C.
  • the remaining residues of the binder ensure one good strength of the molded body even at the beginning of the sintering process, before solidification via the sintering of the metal particle starts.
  • Polyethylene for example, are suitable as permanent binders, Polypropylene, polystyrene, polymethyl methacrylate or Polyvinyl pyrrolidone.
  • the proportions of the permanent binder are preferably about 0.5 to 20% by weight, particularly preferably 2 to 10% by weight, based on the total binder used.
  • the molded part becomes strong in the subsequent sintering process heated, which changes the structure in the desired manner and any remaining residues of the binder can be driven out. This is what is to be sintered Molded part on a base stabilizing the contours of the molded part brought.
  • the temperatures during the sintering process are usually about 600 to 1600 ° C, preferably 800 to 1400 ° C, the duration usually extends from about 0.5 to 10, preferably 1 to 2 hours without heating and cooling times.
  • the document should preferably be such that the The molded part to be sintered not only rests at a few points, but also is in extensive contact with the base, so that one good stabilization is ensured during sintering.
  • the base itself at the sintering temperatures has sufficient creep stability.
  • the method according to the invention is particularly suitable for production thin-walled or large or complex shaped components, which already without such support by you Dead weight tends to deform once the creep resistance of the material is reduced. It opens up the possibility also to produce such molded parts by powder injection molding, which so far this method because of the undesirable deformation were not accessible. This is in addition to those already listed Moldings are generally relevant where there is high dimensional accuracy is required. Usually you can with the help of method according to the invention a dimensional accuracy in the finished Shaped parts, which achieve about 0.5%, in special cases Not exceed 0.3% based on the specified value.
  • Cutlery items such as knives, forks, Spoons as well as moldings with protruding parts that are otherwise under slightly bend their own weight.
  • the method according to the invention offers a simple possibility To produce molded parts economically and inexpensively, whereby a high dimensional accuracy of even complex shaped components with a total high property level can be achieved. It can the method advantageously already without major effort existing injection molding process for the production of metallic molded parts be involved.
  • An injection molding machine was made with a mold for a spoon equipped.
  • the sintered spoon is identified by the Dimensions total length 204 mm, stick length 140 mm, bucket width 44 mm, curvature of the spoon 9 mm, curvature of the handle when resting on a flat surface 12 mm, with wall thicknesses of 1 mm on the spoon part and 3 mm on the stem. Due to the expected linear sintering shrinkage of 14.5% the shape is 14.5% larger in all dimensions than the sintered spoon.
  • the injection molding compound was at one Melt temperature of 190 ° C melted and into the temperature of 110 ° C Mold injected. After a cooling time of approx. 20 sec the green parts were removed from the mold.
  • a mass injected to 56 vol .-% of aluminum oxide powder with an average grain size around 1.2 ⁇ m and 44 vol .-% from one Binder consisted of 88 wt .-% of a polyoxymethylene, Melt index 50 g / 10 min at 190 ° C and 12 wt .-% from one Polybutanediol formal with an average molecular weight of around 60,000.
  • the spoon green containing metal powder was placed in a nitrogen atmosphere, which contained about 1.5% concentrated nitric acid, debinded at a temperature of 120 ° C within 1 h.
  • the sinter pad was in the same device in a Nitrogen atmosphere, which is also about 1.5% concentrated nitric acid contained, at a temperature of 130 ° C within Debinded for 2.5 hours. Thereupon the unbound sinter pad heated in air at a rate of 3 ° C / min to 1.540 ° C, Maintained at 1.540 ° C for 2 hours and then cooled at 5 ° C / min.
  • the dimensions of the non-dense sintered base thus obtained are 4% larger than that of the finished sintered metal spoon.
  • the spoon green part containing the binderless metal powder was opened laid the sinter pad and in one with molybdenum heating elements equipped sintering furnace under hydrogen, which has a dew point of less than -80 ° C at a speed of 5 ° C / min heated to 1,300 ° C, sintered 120 min at 1,300 ° C and the Sinter furnace then cooled.
  • the product was an exactly true to size Get spoons.
  • the green parts obtained according to Example 1 were from the binder component freed by the parts at a speed of 1 ° C / min from 160 ° C to 210 ° C, with 0.5 ° C / min from 210 ° C to 250 ° C and were heated from 250 ° C to 600 ° C at 2 ° C without the parts on to place the sintered base in a spoon shape. After opening the Entbind ceremoniessofen was found to be spherical Parts of the spoon and stick according to the influence of gravity had set and the bulges partially collapsed become.
  • the green parts were placed on standard flat aluminum oxide substrates placed and then in the sintering furnace under hydrogen as in the previous one Example heated to 1,300 ° C at a rate of 5 ° C / min and kept at 1,300 ° C for a further 120 min. After that the oven cooled and opened. The curved contours of the spoons had flattened even further.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Materials For Medical Uses (AREA)

Claims (4)

  1. Procédé pour fabriquer une pièce moulée métallique par conversion d'une matière à mouler par injection, dans lequel
    a) on met la matière à mouler par injection sous la forme de la pièce moulée et
    b) on élimine une partie du liant contenu dans la pièce moulée à une température de 90 à 600°C et
    c) on fritte la pièce moulée ainsi obtenue,
    caractérisé par le fait que l'on fritte la pièce moulée sur un support qui reproduit à peu près le contour de la pièce moulée finie, le contour du support restant essentiellement intact à l'opération de frittage.
  2. Procédé selon la revendication 1, caractérisé par le fait que le support consiste en matériau céramique.
  3. Procédé selon la revendication 1 ou 2, caractérisé par le fait que l'on forme le support par moulage par injection en utilisant le moule des pièces métalliques.
  4. Pièces moulées, en particulier couverts, obtenues selon les revendications 1 à 3.
EP95113801A 1994-09-15 1995-09-02 Procédé de préparation d'articles métalliques par moulage par injection Expired - Lifetime EP0701875B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4432797 1994-09-15
DE4432797 1994-09-15

Publications (2)

Publication Number Publication Date
EP0701875A1 EP0701875A1 (fr) 1996-03-20
EP0701875B1 true EP0701875B1 (fr) 2000-06-07

Family

ID=6528244

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95113801A Expired - Lifetime EP0701875B1 (fr) 1994-09-15 1995-09-02 Procédé de préparation d'articles métalliques par moulage par injection

Country Status (5)

Country Link
US (1) US5737683A (fr)
EP (1) EP0701875B1 (fr)
JP (1) JPH0881701A (fr)
DE (1) DE59508447D1 (fr)
ES (1) ES2146686T3 (fr)

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JP2955754B1 (ja) * 1998-06-01 1999-10-04 有限会社モールドリサーチ 金属粉末の射出成形用組成物と、その組成物を用いた射出成形及び焼結法
DE69941420D1 (de) * 1998-11-17 2009-10-29 Hitachi Metals Ltd Verfahren zur Herstellung und Behandlung von magnetischen gepressten Grünlingen
SE514558C2 (sv) * 1999-07-02 2001-03-12 Seco Tools Ab Metod och anordning för att tillverka ett verktyg
US6315935B1 (en) 1999-08-26 2001-11-13 Alliedsignal Inc. Low pressure injection molding of knife blades from metal feedstocks
US6537487B1 (en) 2000-06-05 2003-03-25 Michael L. Kuhns Method of manufacturing form tools for forming threaded fasteners
US6676895B2 (en) 2000-06-05 2004-01-13 Michael L. Kuhns Method of manufacturing an object, such as a form tool for forming threaded fasteners
JP2004536967A (ja) * 2001-05-14 2004-12-09 ハネウェル・インターナショナル・インコーポレーテッド 大きな部品の金属射出成形に使用する焼結方法および工具
US6838046B2 (en) * 2001-05-14 2005-01-04 Honeywell International Inc. Sintering process and tools for use in metal injection molding of large parts
DE10343780A1 (de) * 2003-09-22 2005-04-14 Mtu Aero Engines Gmbh Verfahren zur Herstellung von Bauteilen und Halteeinrichtung
DE102004016333B4 (de) * 2004-04-02 2006-08-31 Webasto Ag Heizgeräte-Brenner mit einer Prallscheibe
US20050227772A1 (en) * 2004-04-13 2005-10-13 Edward Kletecka Powdered metal multi-lobular tooling and method of fabrication
US7413702B2 (en) * 2005-06-30 2008-08-19 Honeywell International Inc. Advanced sintering process and tools for use in metal injection molding of large parts
DE102008059191A1 (de) * 2008-11-27 2010-06-02 Schaeffler Kg Spanneinheit für eine Zugmittelspannvorrichtung
US20100178194A1 (en) * 2009-01-12 2010-07-15 Accellent, Inc. Powder extrusion of shaped sections
FR2944721B1 (fr) * 2009-04-24 2014-03-07 Snecma Procede de fabrication d'un aubage par moulage par injection de poudre metallique
US9556072B2 (en) 2009-06-25 2017-01-31 Basf Se Process for the continuous thermal removal of binder from a metallic and/or ceramic shaped body produced by injection molding, extrusion or pressing using a thermoplastic molding composition
AT509613B1 (de) * 2010-04-01 2017-05-15 Technische Universität Wien Verfahren zur herstellung von formköpern aus aluminiumlegierungen
CN102554234A (zh) * 2012-02-28 2012-07-11 惠州Tcl移动通信有限公司 一种金属注塑成型结构件的加工方法及其支撑治具
KR102322534B1 (ko) * 2014-06-02 2021-11-05 바스프 에스이 소결된 성형물의 제조 방법
DE102015210770A1 (de) * 2015-06-12 2016-12-15 Rolls-Royce Deutschland Ltd & Co Kg Bauteilkonstruktion, Bauteil für eine Gasturbine und Verfahren zur Herstellung eines Bauteils einer Gasturbine durch Metallpulverspritzgießen
FR3037831B1 (fr) * 2015-06-26 2019-08-16 Alliance Fabrication d'un secteur courbe d'anneau de turbine par moulage et frittage
JP6745631B2 (ja) 2016-04-05 2020-08-26 三菱重工航空エンジン株式会社 焼結体の製造方法及び燃焼器パネルの製造方法
US20190015709A1 (en) * 2017-07-12 2019-01-17 Changchun Chen Golf head and manufacturing method thereof
CN107398559A (zh) * 2017-08-10 2017-11-28 攀枝花学院 一种搭配支撑的大型零部件粉末注射成型方法
WO2020129049A1 (fr) * 2018-12-16 2020-06-25 Tritone Technologies Ltd. Supports destinés à des éléments pendant le déliement et le frittage
CN111136275A (zh) * 2020-01-20 2020-05-12 江苏精研科技股份有限公司 一种注射成形制备大面积薄壁件的方法
CN111250710B (zh) * 2020-03-11 2022-12-09 东莞华晶粉末冶金有限公司 一种防烧结变形的中空结构差速器外壳加工方法
CN116917064A (zh) 2021-01-20 2023-10-20 巴斯夫欧洲公司 用于制备具有低密度和良好机械性质的金属部件的材料和方法
WO2022200170A1 (fr) 2021-03-22 2022-09-29 Basf Se Charge d'alimentation mim et procédé de fabrication de pièces métalliques présentant une limite d'élasticité et une ductilité améliorées
CN116493591A (zh) * 2023-03-09 2023-07-28 美轲(广州)新材料股份有限公司 一种双金属组件高尔夫球头金属注射成型一次性烧结制备工艺

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Also Published As

Publication number Publication date
ES2146686T3 (es) 2000-08-16
JPH0881701A (ja) 1996-03-26
US5737683A (en) 1998-04-07
DE59508447D1 (de) 2000-07-13
EP0701875A1 (fr) 1996-03-20

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