EP0956918B1 - Procédé pour la fabrication d'un produit intermédiaire pour moulage par injection - Google Patents

Procédé pour la fabrication d'un produit intermédiaire pour moulage par injection Download PDF

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Publication number
EP0956918B1
EP0956918B1 EP99109012A EP99109012A EP0956918B1 EP 0956918 B1 EP0956918 B1 EP 0956918B1 EP 99109012 A EP99109012 A EP 99109012A EP 99109012 A EP99109012 A EP 99109012A EP 0956918 B1 EP0956918 B1 EP 0956918B1
Authority
EP
European Patent Office
Prior art keywords
mixing
powder
mixture
mixing container
paste
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
EP99109012A
Other languages
German (de)
English (en)
Other versions
EP0956918A1 (fr
Inventor
Hans-Dieter Hullmann
Ulrich Schär
Ludger Schürmann
Burkhard Wulf
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.)
Gebrueder Loedige Maschinenbau GmbH
Original Assignee
Gebrueder Loedige Maschinenbau 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 Gebrueder Loedige Maschinenbau GmbH filed Critical Gebrueder Loedige Maschinenbau GmbH
Publication of EP0956918A1 publication Critical patent/EP0956918A1/fr
Application granted granted Critical
Publication of EP0956918B1 publication Critical patent/EP0956918B1/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
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/80—Falling particle mixers, e.g. with repeated agitation along a vertical axis
    • B01F25/90—Falling particle mixers, e.g. with repeated agitation along a vertical axis with moving or vibrating means, e.g. stirrers, for enhancing the mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/70—Mixers specially adapted for working at sub- or super-atmospheric pressure, e.g. combined with de-foaming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F35/92—Heating or cooling systems for heating the outside of the receptacle, e.g. heated jackets or burners
    • 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
    • B22F1/14—Treatment of metallic powder
    • B22F1/148—Agglomerating
    • 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 a method for manufacturing an injection-molded intermediate of metal powder or ceramic powder and at least one organic Binder.
  • the raw materials are combined with the binder within the device (kneader) Treated with the help of kneading elements by a separate heating device warmed and after melting the binder kneaded into a paste. Then the paste be removed from the device to be obtained from the "Feedstock” designated intermediate product (paste) to be produced Splash object. This still means Firing processes or sintering object to be cured Called "green body”. If necessary, the intermediate be further treated before injection molding. This further treatment can be in a granulation or a grinding the cooled paste exist.
  • the raw materials must be used to manufacture the intermediate and the binder disadvantageously between 2 and Kneaded for 20 hours.
  • the produced paste only little homogeneity. This minor or lack of homogeneity also affects the recycling process or the use of injection molding Waste products from the device again be fed. It shows that there is a big difference in the flow behavior between pure raw materials and recycled Product waste is present.
  • the insufficient homogeneity of the Paste also means that the paste may be in an extruder or has to be treated on a roller mill.
  • Carrying out the kneading treatment of a mixture of raw materials and at least one binder is dependent of the mixture used only possible if a corresponding one Mixture is selected. Not every type of kneader is suitable for any mixture, so that the mixture under Circumstances must be changed.
  • the method known from DE 36 11 271 relates to a Process for the production of metal moldings in a powder metal injection molding process.
  • Metal powders are made with a Binder mixed in a mixer or kneader, the Long chain polymer and polymer binders with a short chain length.
  • the polymers with long Chain lengths envelop the metal particles and thus protect them from corrosion, while the polymers with short chain length Fill voids between the powder particles during injection molding.
  • thermoplastic Polymer and organic filler such as. Known pieces of wood.
  • thermoplastic Polymer and organic filler mixed, wherein the thermoplastic polymer and the organic filler partially clump or agglomerate. A warming takes place during mixing. Then the Mix at a temperature above the melting point of the thermoplastic hardened and extruded.
  • EP 0 764 616 describes a plastically deformable aqueous Mixture known. Metal or ceramic powder, organic binders, plasticizers and water manue11 mixed and then a mixing container of a mixer fed where they are at room temperature or with external feed Heat mixed and plasticized.
  • EP 0 688 746 describes a method for producing a Paste made of metal or ceramic powder and one of three components existing organic binder.
  • the powder particles and the binder are in a kneader at a temperature of 100 ° C - 200 ° C to a paste mixed.
  • the object of the present invention is to provide a method for production of a high quality, to develop injection-moldable intermediate.
  • This problem is solved by a method in which the Metal powder or ceramic powder and the organic binder in a mixing container using mixing elements that so rotate quickly that a mixing drum or A mix ring is created, first of all into a free-flowing one Powder mixture processed and then with the help of mechanical processing of the free-flowing powder mixture through the mixing elements and / or other internals (digestion tools, rod-shaped elements, knives, etc.) heated and that the organic binder by the mechanical Processing is melted in the mixing container, being from the mixture of the metal powder or ceramic powder and a paste of the at least one organic binder is produced.
  • the mixing elements are said to be one Have circumferential speed> 20 m per second.
  • the components of the mixture are either simultaneous or added to the mixing container one after the other.
  • Processing of the mixing components with the help of the mixing elements creates frictional heat that heats up the mixing components is used.
  • the heating process can in exceptional cases still supported by wall heating of the mixing container or be started. In this stage of the process there is an intensive premixing of the metal powder or the ceramic powder with the organic binder. The result is a mostly free-flowing powder mixture of high Mixing quality.
  • agglomerate or a paste as an intermediate arise that are sprayed in a form into an object can be. Both the agglomerate and the paste show great homogeneity. This mix quality also has an effect quality enhancing on the end product, which from the intermediate product can be produced.
  • the attached to a fast rotating mixing shaft Mixing elements enable the duration of the process in the limit most cases to 10 to 20 minutes.
  • Processing of metal or ceramic powder and organic Binder in the device using the fast rotating mixing elements can be independent of the the mixture of metal or ceramic powders supplied to the device and binders are carried out.
  • One on the Mixing adjusted speed of the mixing shaft can by a Control of the device can be set so that the desired Premixing and heating of the mixture occurs.
  • the mixing elements can still be rigid or movable Work internals in the mixing room so that the Mixing and / or digestion and heating times can be shortened can.
  • the method according to the invention advantageously leads to a reduction in investment and operating costs and works also the service life of a device to perform the procedure positively.
  • the binding agent is machined in the mixing container melted, the mixture of Metal or ceramic powder and the at least one organic Binder a paste is generated.
  • the powder particles can create a viscous mass with the binder particles of doughy consistency.
  • the connection of the powder particles and binder particles results in a flowable Intermediate.
  • the malleable paste is through its processing also highly homogenized by means of the mixing elements.
  • the paste can be cooled and agglomerated to to process an agglomerate with an injection molding machine.
  • the process can be used to manufacture intermediates used for powder injection molding (PIM) technology are suitable.
  • PIM powder injection molding
  • Organic binders into consideration with the Metal or ceramic powder react and / or the compound the powder particles can accelerate with each other.
  • the Organic binders can provide adequate fluidity care in the injection molding machine and the injected and hardened blank (green body) great dimensional stability give.
  • the binder can be removed from the green body by burning or sintering can be removed.
  • the inventive method is equally for MIM (Metal Injection Molding) and CIM (Ceramic Injection Molding) usable.
  • the figure shows a side view of a mixing container with rapidly rotating mixing elements for the production of an injection-moldable intermediate.
  • a device 1 has for carrying out a method for the production of an injection-moldable intermediate product Metal or ceramic powders and at least one organic Binder a vertically arranged, a feed direction 2 and a mixing container 4 having a removal direction 3 on.
  • the mixing container 4 the metal or ceramic powder and the at least one organic binder in the feed direction 2 can be initiated.
  • the intermediate product created can leave the mixing container 4 in the removal direction 3.
  • the metal or ceramic powder can be in the mixing container 4 be stored before processing begins. at high binder content becomes part of the binder recharged.
  • the metal or ceramic powder topped up to the mixture of metal or Affect ceramic powder and binder.
  • the mixing container 4 has a bottom 5 and a lid 6 on.
  • a rotatable shaft 7 is arranged in the mixing container 4, which penetrates a bearing 8 in the floor area.
  • the Bearing 8 is on the one hand on the mixing container 4 and on the other hand flanged to the machine frame 9.
  • the gas and product tight lockable cover 6 can be pivoted in the direction of arrow 10.
  • On the cover 6 there is a product entry nozzle 11, a gas discharge port 12 and a liquid addition port 13 provided.
  • the mixing container 4 has also via a double jacket 15, which in connection with Stub 16, 17 stands and the side walls of the mixing container 4 surrounds.
  • the double jacket 15 can optionally for Temperature control of the mixing room or for cooling the manufactured one Find intermediate product by using fluids over the nozzle 16, 17 can flow into the double jacket 15.
  • Mixing elements 18 to 18 '' 'on shaft 6 are exemplary attached to a located in the mixing container 4 Multi-component mixture of metal or ceramic powder and to be able to process organic binders.
  • the shaft 7 by a motor 20, preferably one Electric motor that is driven is the mixture of the Metal or ceramic powder and the at least one organic Binder first premixed and homogenized.
  • the material located in the mixing container 4 is the rotation of the Shaft 7 positively moved in the direction of arrow 19.
  • the shaft 7 rotates at high speed so that the mixture inside the mixing container 4 a material flow or a Can form a mixture ring. Due to the fast rotation of the Shaft 7 can generate frictional heat between the mixing elements 18 up to 18 '' 'and powder particles and / or binder particles be transmitted. Surfaces of binder particles can are melted down so that they can be melted together with the Raw material particles form an agglomerate.
  • the binder can be processed in the mixing container 4 also heated in such a way with the mixing elements 18 to 18 '' ' be that it will reach the binder melting point can come. In this case, it is created in the mixing container 4 a flowable paste through an intimate connection the powder particles with each other and with the binder particles. Due to the rotary movement of the shaft 7, an amount of energy from 0.5 to 1.5 [KW / (kg of mixed material)] become. The speed of the shaft 7 can be controlled of the motor 20 continuously adjustable. Even the manufactured one Paste can over the product discharge nozzle 14 in the removal direction 3 are removed from the mixing container 4.
  • the paste produced can also be in the mixing container 4 with the help of the double jacket 15 designed as a cooling jacket be cooled so that an agglomerate again from the paste can be won.
  • the agglomerate can then be used accordingly removed from the mixing container 4 and processed further become.
  • a process for making an injection moldable intermediate made of metal or ceramic powder and at least an organic binder is in a mixing container 4th feasible.
  • mixing elements 18 up to 18 '' 'the metal or ceramic powder and the minimum an organic binder first becomes a free-flowing Powder mixture processed, which then with With the help of mechanical processing of the powder mixture the mixing elements 18 to 18 '' 'and / or other internals is heated and processed into the intermediate product.
  • the process enables the most effective production possible a high-quality, injection-moldable intermediate in a significantly shorter working time.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Powder Metallurgy (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Dental Preparations (AREA)
  • Silicon Compounds (AREA)

Claims (2)

  1. Procédé pour fabriquer un produit intermédiaire convenant pour le moulage par injection et formé par une poudre métallique ou une poudre céramique et par au moins un liant organique, caractérisé en ce qu'on traite tout d'abord la poudre métallique ou la poudre céramique et le liant organique dans un récipient de mélange (4) à l'aide d'éléments mélangeurs (18, 18', 18", 18"'), qui tournent suffisamment rapidement pour qu'il apparaisse une trombe de mélange ou un anneau de matière mélangée dans le récipient de mélange (4), pour obtenir un mélange sous forme de poudre apte à s'écouler et on chauffe ensuite au moins des éléments de mélange (18, 18"') à l'aide du traitement mécanique du mélange à l'état de poudre apte à s'écouler et que le liant organique fond sous l'effet du traitement mécanique dans le récipient de mélange (4), une pâte étant obtenue à partir du mélange de la poudre métallique ou de la poudre céramique et du au moins un liant organique.
  2. Procédé selon la revendication 1, caractérisé en ce que la pâte est refroidie et s'agglomère dans le récipient de mélange (4).
EP99109012A 1998-05-12 1999-05-06 Procédé pour la fabrication d'un produit intermédiaire pour moulage par injection Expired - Lifetime EP0956918B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19821072 1998-05-12
DE19821072A DE19821072C2 (de) 1998-05-12 1998-05-12 Verfahren zur Herstellung eines spritzgußfähigen Zwischenprodukts

Publications (2)

Publication Number Publication Date
EP0956918A1 EP0956918A1 (fr) 1999-11-17
EP0956918B1 true EP0956918B1 (fr) 2002-08-07

Family

ID=7867413

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99109012A Expired - Lifetime EP0956918B1 (fr) 1998-05-12 1999-05-06 Procédé pour la fabrication d'un produit intermédiaire pour moulage par injection

Country Status (5)

Country Link
US (1) US6234660B1 (fr)
EP (1) EP0956918B1 (fr)
DE (2) DE19821072C2 (fr)
ES (1) ES2181334T3 (fr)
IL (1) IL129822A0 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104139180A (zh) * 2013-05-07 2014-11-12 柯马杜股份有限公司 粉末冶金中混料的方法和混料机以及用于注塑成型组合物的粘结剂

Families Citing this family (9)

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DE10328628A1 (de) * 2003-06-26 2005-01-20 Volkswagen Ag Vorrichtung und Verfahren zur Befeuchtung eines Gasstroms
US9403213B2 (en) * 2006-11-13 2016-08-02 Howmedica Osteonics Corp. Preparation of formed orthopedic articles
EP2765123B1 (fr) * 2013-07-26 2016-01-20 Comadur S.A. Malaxeur Malaxage de matière première pour métallurgie des poudres
US10022845B2 (en) 2014-01-16 2018-07-17 Milwaukee Electric Tool Corporation Tool bit
US11638987B2 (en) 2017-12-01 2023-05-02 Milwaukee Electric Tool Corporation Wear resistant tool bit
USD921468S1 (en) 2018-08-10 2021-06-08 Milwaukee Electric Tool Corporation Driver bit
CN112871043A (zh) * 2019-11-29 2021-06-01 内蒙古伊利实业集团股份有限公司 一种用于乳制品配料的真空循环化料系统及化料方法
AU2021200246A1 (en) 2020-01-31 2021-08-19 Howmedica Osteonics Corp. Injection molding feedstock delivery system
CN113005637A (zh) * 2021-02-18 2021-06-22 金艺炜 一种熔喷无纺布的加工工艺

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Publication number Priority date Publication date Assignee Title
CN104139180A (zh) * 2013-05-07 2014-11-12 柯马杜股份有限公司 粉末冶金中混料的方法和混料机以及用于注塑成型组合物的粘结剂

Also Published As

Publication number Publication date
DE59902246D1 (de) 2002-09-12
EP0956918A1 (fr) 1999-11-17
ES2181334T3 (es) 2003-02-16
DE19821072A1 (de) 1999-11-25
US6234660B1 (en) 2001-05-22
IL129822A0 (en) 2000-02-29
DE19821072C2 (de) 2000-09-21

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