EP1934007B1 - Procede de fabrication d'un objet compose d'au moins une partie mobile independante et d'une partie de fixation - Google Patents

Procede de fabrication d'un objet compose d'au moins une partie mobile independante et d'une partie de fixation Download PDF

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Publication number
EP1934007B1
EP1934007B1 EP06791647A EP06791647A EP1934007B1 EP 1934007 B1 EP1934007 B1 EP 1934007B1 EP 06791647 A EP06791647 A EP 06791647A EP 06791647 A EP06791647 A EP 06791647A EP 1934007 B1 EP1934007 B1 EP 1934007B1
Authority
EP
European Patent Office
Prior art keywords
gear wheels
cavities
fixing part
gears
cavity
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.)
Not-in-force
Application number
EP06791647A
Other languages
German (de)
English (en)
Other versions
EP1934007A1 (fr
Inventor
Guido Finnah
Jürgen HAUSSELT
Klaus Plewa
Volker Piotter
Steffen Rath
Robert Ruprecht
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.)
Karlsruher Institut fuer Technologie KIT
Original Assignee
Karlsruher Institut fuer Technologie KIT
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 Karlsruher Institut fuer Technologie KIT filed Critical Karlsruher Institut fuer Technologie KIT
Publication of EP1934007A1 publication Critical patent/EP1934007A1/fr
Application granted granted Critical
Publication of EP1934007B1 publication Critical patent/EP1934007B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/08—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs
    • 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
    • B22F2998/10—Processes characterised by the sequence of their steps

Definitions

  • the invention relates to a method for producing an article from at least two independent, mutually movably connected gears, which are positioned in a fixing part to each other.
  • From the DE 33 40 122 A1 is a method for producing an article from at least two independent, mutually movably connected parts, which are positioned in at least one fixing firmly to each other, known by injection molding, in which different plastics are used to produce the movable, interconnected parts.
  • a molded part is first produced in a cavity. This is taken from the cavity and placed in a larger cavity in the same tool or the cavity is extended by tool movements.
  • the mobility can be achieved by using the same plastics by processing the second component at the lower limit of the processing temperature.
  • both components are used at low processing temperatures or the component for the first injection-molded part can be exposed to high service temperatures in the short term.
  • the loose bond arises when the usual thermal shrinkage for plastics occurs.
  • This method is not suitable for producing a loose composite of ceramic molding compounds or metals, since the incompatibility of the plastics is a prerequisite for this method, which also includes no heat treatment.
  • the DE 196 52 223 C2 discloses structured moldings of at least two different materials, which are joined together in a composite material. Furthermore, the setting of a stress-relieving joining zone is described there by suitable material composition or different particle content in partial volumes of the materials. For example, pure binder is used to produce hollow bodies. A production of movable components is not disclosed.
  • Injection molding replaces assembly ", VDI-Nachzin, 22.10.2004, page 30 , a method for manufacturing a microgear (planetary gear) is described.
  • the sun and planetary gears are molded from non-adhesion-compatible plastics and then overmoulded with the cover plates and the axles. Due to the geometry of the part geometry, the incompatibility and the shrinkage behavior of the plastics from which the cover plates and the axles are made, the gears remain movable on the axles.
  • three injections are required to produce a transmission of two gears and a fixing part.
  • the JP 06 093306 A discloses a method of making two self-supporting, mutually-movable parts. First, a first part of high-shrinkage material is injected. This green compact is then placed in a second mold and a second lower shrinkage material is then injected into the mold cavity of the second mold. When removing the composite part both items are firmly connected together and the gap between the two forms only in the emeinseam subsequent heat treatment by the different shrinkage.
  • the EP 1 295 657 A1 describes a method for producing movably interconnected combination parts made by injection molding.
  • a first part is produced by POIM ( powder injection molding ).
  • This first part then becomes one second part molded around, wherein the two parts form a firm Verbindun together. Due to the greatly varying shrinkage of the two parts, the first part dissolves in the subsequent debindering and sintering of the unbending second part, creating a composite part with mutually movable parts.
  • this method should allow the production of an article of metallic, glassy or ceramic components by means of injection or hot casting in one operation to reduce handling and adjustment technology after molding the parts of the article or to avoid.
  • the inventive method for producing an article comprises the steps a) to e).
  • a tool is provided according to step a), each having a cavity for receiving one of the gears to be formed.
  • the tool further has a parting plane which divides the tool into two mold halves.
  • Decisive here is the arrangement of the cavities with respect to this parting plane:
  • the cavities are, with respect to the parting plane, adjacent to each other alternately above or below the parting plane arranged so that they lie alternately in one of the two mold halves, the cavities remain separated.
  • the at least one cavity is filled with a hardenable or solidifying molding compound comprising a sintered material. After the solidification of the molding material, the parts to be formed are formed in the cavities.
  • the material for injection or hot casting from at least one injection unit via at least one channel at the same time or in succession introduced into the cavities are particularly suitable for this purpose.
  • Particularly suitable for this purpose are the two- or multi-component injection molding.
  • each gear formed is removed from its cavity.
  • step d) Following their removal from the mold, the toothed wheels according to step d) are introduced into a cavity, through the filling of which the fixing part is shaped.
  • the demoulded gears are for this purpose mounted on the fixing part or joined thereto.
  • the total number of demolded gear wheels is transferred into at least one further cavity likewise present in the tool, through the filling of which the fixing part is shaped.
  • the transmission of the gears from the cavities in which their shaping took place, in the further cavity is preferably carried out by means of guide elements, which may remain after transfer completely or partially in the at least one other cavity.
  • guide elements At those points where the guide elements are removed from the mold, there is an extension of the further cavity, through the filling of which an additional connection is created between at least one part and the fixing part.
  • the guide elements or parts thereof can serve as an ejector in terms of a simpler handling technique.
  • step e) the still unfinished article, which can be referred to as a green compact, is subjected to a heat treatment, in particular debindering with subsequent sintering.
  • various molding materials which are called Feedstocks and consist of a binder and a powder of the desired material, so injected into the tool that they can touch each other.
  • the parts can also be injection molded from the same feedstock.
  • the binder In order to convert the molding compositions into a metal, glass or ceramic part, the binder must be removed on the basis of water, oligomers, polymers or mixed systems after molding and the powder sintered to form a generally dense material, with shrinkage taking place. This shrinkage leads to the reduction of the article compared to the at least one injection-molded part, the also called greenling.
  • the materials In order for the article, which may be made of different components, to be sintered, the materials must have similar sintering temperatures, or a component that sinters earlier may shrink from the design of the gearbox earlier than the one that sinters at a higher temperature. Due to the differences in the sintering shrinkage of the materials used for the gears and the fixing parts distance and clearance between the parts are set with each other and between the parts and the fixing part. In many cases, it is advantageous if the fixing parts shrink more than the movable gears.
  • the sintering shrinkage for sintered materials generally ranges between 10% and 25%, while the thermal shrinkage in plastics is at most 3%.
  • the gears are made of metal, an alloy, a (mixed) ceramic or glass.
  • Particularly preferred for the (gears) is hardened steel (preferably 17-4PH) or a tough ceramic, in particular zirconium dioxide.
  • the fixing member As materials for the fixing member, hard metals (e.g., tungsten carbide-cobalt), hardened metals, hard ceramics (particularly alumina), silicon nitride or silicon carbide are preferably used.
  • the fixing part need not necessarily be made of a sintered material. In this case, however, it is advantageous if the fixing part is already inserted directly into the tool.
  • the present invention has as a significant advantage that gears and fixing parts can consist of wear-resistant and / or high-strength materials. Furthermore, the gears need not be mounted after molding and sintering.
  • the inventive method is suitable for use in microsystems technology, powder injection molding, two-component powder injection molding, in transmission technology (for planetary gear, ball joints, bearings, linear guides, etc.) and in manufacturing technology for gearbox construction.
  • the inventive method makes it possible to mutually pair the moving gears of the transmission already during the molding process and install in a housing for supporting the movable gears.
  • the first embodiment describes the manufacture of a gear transmission according to Fig. 6 by two-component injection molding.
  • the in Fig. 1a used schematically illustrated tool having three cavities for three gears to be produced 11, 11 ', 12 , which, as in Fig. 1b can be seen, arranged separately next to each other axially offset.
  • the tool further has a parting plane which divides the tool into two mold halves 1, 2 , in the ejector-side mold half 1 and in the nozzle-side mold half 2.
  • the ejectors can be stepped, ie be provided with an ejector sleeve 4, 4 ' , so that an end-side force application of the ejector sleeve on the gear supports the demolding of the ejector.
  • Fig. 2 shown schematically push the ejector 2, 5, 5 ' all the gears 11, 11', 12 beyond the parting plane between the ejector-side mold half 1 and the nozzle-side mold half 2 when demolding, so that all three gears 11, 11 ', 12 in lie on a third level and are thereby engaged.
  • the tool jaws 6, which enclose all three gears 11, 11 ', 12 , above and below the third plane, in which now the gears 11, 11', 12 are located, each on the gears 11, 11 ', 12 opposite side with a second feedstock containing alumina powder, overmoulded.
  • the injection point can be positioned as desired, however, an injection point in the position 21 is advantageous.
  • the second feedstock fills the cavities in the tool jaws 6 and the volume of the cavities in the outer gears 11, 11 ' exposed by the withdrawn ejectors 5, 5 '. , whereby their axes are formed. In the area of the hubs of the gears from the first feedstock, the second feedstock touches the first feedstock, without any mixing of the two feedstocks.
  • An advantageous embodiment of the tool jaws 6 is that the tool jaws 6 are double-walled.
  • the second feedstock thus also forms a fixing part 14 for the transmission.
  • the fixing part 14 can later as housing serve the transmission.
  • both feedstocks sinter at the same sintering temperature with a sintering shrinkage which is either the same for the parts 11, 11 ', 12 and the fixing part 14 or assumes slightly greater values for the fixing part 14 .
  • zirconium dioxide parts adhere to the aluminum oxide parts, they change to a soluble compound during the first movement of the gearbox.
  • the second embodiment is a variant of the first embodiment, wherein the gear according to Fig. 6 produced in three-component injection molding.
  • the shape of the gears 11,11 ', 12. Also serving simultaneously as a housing fixing member 14 is formed in the same way.
  • all ejectors 3, 5, 5 ' remain in the hubs of the gears 11, 11', 12. Only then are the ejectors 5, 5 ' for the outer gears 11, 11' pulled and the vacant cavity is filled with a third feedstock occupying the volume of the axes of the two outer gears 11, 11 ' .
  • the third feedstock like the second feedstock, contains alumina powder, but with a powder fill level and / or a powder particle size distribution that permits greater shrinkage during sintering than in the first or second feedstock.
  • the length of the axes is dimensioned by the shape of the tool so that it fits the sintering shrinkage.
  • the second feedstock can have the same or a slightly lower sintering shrinkage compared to the first feedstock. With the difference in sintering shrinkage distance and clearance between the gears and the fixing part are set.
  • the tool is advantageous to equip the tool as a three-plate tool with turntable on the ejector-side mold half 1 .
  • the ejector-side mold half 1 rotates the gears 11, 11 ', 12 with the aid of the turntable in the direction of the tool jaws 6, which may be mounted on the nozzle side, on the ejector-side mold half 1, the nozzle-side mold half 2 or outside of the tool.
  • a special embodiment of the tool makes it possible to shape the next gears already during the shaping of the fixing part 14 (housing) or the axes in the cavities of the tooth geometry, which are advantageously arranged on the nozzle-side mold half 2 .
  • the thickness of the tool jaws 6 and the sintering shrinkage as well as the difference of the sintering shrinkage between the first and the second feedstock define the gap.
  • small pyramidal or conical micro-elevations can be formed on the gears or the housings in the region of the hubs or the end faces of the gears. Even if it comes in the area of the tips of the pyramids or cones for sintering of gears and housing, such. B. when using different Steels, by applying a torque between the gears and the housing in the state of the green body or preferably in the sintered state, this compound can be easily broken by their smallness.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Producing Shaped Articles From Materials (AREA)

Claims (6)

  1. Procédé de fabrication d'un objet comprenant au moins deux pignons indépendants, reliés de manière mobile l'un par rapport à l'autre, et positionnés l'un par rapport à l'autre dans une pièce de fixation, procédé comprenant les étapes suivantes :
    a) utiliser un outil ayant une cavité pour chacun des pignons à former indépendamment et reliés de manière mobile l'un par rapport à l'autre et aussi un plan de séparation qui divise l'outil en deux moitiés et sépare les cavités l'une de l'autre et qui se trouve de manière alternée dans l'une des moitiés d'outil,
    b) remplir au moins les deux cavités avec une masse de moulage durcissable ou qui se fige, contenant un matériau de frittage, pulvérulent et un liant et laisser figer la masse moulée pour qu'il se forme dans chacune des deux cavités, chaque fois le pignon à réaliser,
    c) mouler les deux pignons dentés formés dans les deux cavités,
    d) transférer les deux pignons démoulés dans une autre cavité existant dans l'outil et remplir cette autre cavité avec un autre matériau de façon que la partie fixe donne la forme,
    * une liaison fixe existant tout d'abord entre les deux roues dentées de la pièce de fixation,
    e) faire un traitement thermique de l'objet pour que la liaison fixe soit transformée en une distance entre les deux pignons dentés et la pièce de fixation pour que les deux pignons soient mobiles et positionnés par rapport à la pièce de fixation.
  2. Procédé selon la revendication 1,
    selon lequel
    les pignons dentés démoulés, sont transférés à l'aide d'éléments de guidage qui, après le transfert, restent en totalité ou en partie dans au moins une autre cavité.
  3. Procédé selon la revendication 1 ou 2,
    selon lequel
    au moins deux pignons indépendants, reliés de manière mobile l'un par rapport à l'autre, sont installés après le remplissage des cavités, dans un plan de façon que les pignons soient en prise sans se toucher.
  4. Procédé selon l'une des revendications 1 à 3,
    selon lequel
    on introduit un matériau pour l'injection ou la coulée à chaud par au moins une unité d'injection par au moins un canal vers au moins deux cavités et on transfère un autre matériau d'injection ou de coulée à chaud à partir d'une unité d'injection par un canal à l'autre cavité.
  5. Procédé selon l'une des revendications 1 à 4,
    selon lequel
    au moins les deux matériaux sont fournis par une injection à deux ou plusieurs composants.
  6. Procédé selon l'une des revendications 1 à 5,
    selon lequel
    l'objet est séparé du liant et est fritté dans l'étape e).
EP06791647A 2005-09-14 2006-08-25 Procede de fabrication d'un objet compose d'au moins une partie mobile independante et d'une partie de fixation Not-in-force EP1934007B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005043772A DE102005043772A1 (de) 2005-09-14 2005-09-14 Verfahren zur Herstellung eines Gegenstandes aus mindestens einem selbständigen beweglichen Teil und einem Fixierteil
PCT/EP2006/008330 WO2007031183A1 (fr) 2005-09-14 2006-08-25 Procede de fabrication d'un objet compose d'au moins une partie mobile independante et d'une partie de fixation

Publications (2)

Publication Number Publication Date
EP1934007A1 EP1934007A1 (fr) 2008-06-25
EP1934007B1 true EP1934007B1 (fr) 2011-12-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP06791647A Not-in-force EP1934007B1 (fr) 2005-09-14 2006-08-25 Procede de fabrication d'un objet compose d'au moins une partie mobile independante et d'une partie de fixation

Country Status (6)

Country Link
US (1) US20090039547A1 (fr)
EP (1) EP1934007B1 (fr)
JP (1) JP2009507685A (fr)
AT (1) ATE538889T1 (fr)
DE (1) DE102005043772A1 (fr)
WO (1) WO2007031183A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009016189B4 (de) 2009-04-03 2013-08-29 Karlsruher Institut für Technologie Herstellverfahren für Verbundbauteile mit mindestens zwei Komponenten
DE102013219541B4 (de) * 2013-09-27 2019-05-09 Evonik Degussa Gmbh Verbessertes Verfahren zur pulvermetallurgischen Herstellung thermoelektrischer Bauelemente
ES2704132T3 (es) 2016-01-21 2019-03-14 Evonik Degussa Gmbh Procedimiento racional para la producción pulvimetalúrgica de componentes termoeléctricos
DE102018213003A1 (de) * 2018-08-03 2020-02-06 Robert Bosch Gmbh Verfahren zum Herstellen einer Globoidschnecke für ein Schneckengetriebe

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Also Published As

Publication number Publication date
US20090039547A1 (en) 2009-02-12
WO2007031183A1 (fr) 2007-03-22
JP2009507685A (ja) 2009-02-26
EP1934007A1 (fr) 2008-06-25
DE102005043772A1 (de) 2007-03-15
ATE538889T1 (de) 2012-01-15

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