EP2606997A1 - Procédé destiné à la fabrication dýun composant par moulage par injection de poudre métallique - Google Patents

Procédé destiné à la fabrication dýun composant par moulage par injection de poudre métallique Download PDF

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Publication number
EP2606997A1
EP2606997A1 EP12198188.0A EP12198188A EP2606997A1 EP 2606997 A1 EP2606997 A1 EP 2606997A1 EP 12198188 A EP12198188 A EP 12198188A EP 2606997 A1 EP2606997 A1 EP 2606997A1
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EP
European Patent Office
Prior art keywords
bräunlingsteilstück
sintering process
sintered
bräunlingsteilstücke
brown body
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
EP12198188.0A
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German (de)
English (en)
Other versions
EP2606997B1 (fr
Inventor
Dan Roth-Fagaraseanu
Lukas Schrüfer
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.)
Rolls Royce Deutschland Ltd and Co KG
Original Assignee
Rolls Royce Deutschland Ltd and Co KG
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Filing date
Publication date
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Publication of EP2606997A1 publication Critical patent/EP2606997A1/fr
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Publication of EP2606997B1 publication Critical patent/EP2606997B1/fr
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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
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
    • 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
    • B22F5/009—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of turbine components other than turbine blades
    • 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
    • B22F5/04—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of turbine blades
    • 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
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • 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
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
    • 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
    • B22F2005/005—Article surface comprising protrusions

Definitions

  • the invention relates to a method for producing a component by metal powder injection molding of metal powder mixed with a binder, in which individual components of the component are produced as separately shaped green compact and then unbonded brown compact sections which are assembled into a two- or multi-part brown compact and sintered in an assembled state become.
  • the method is suitable, for example, for producing thermally stressed engine components with a geometrically complex structure.
  • metal injection molding It is known to produce components of high geometric complexity from different metals such as stainless steels, case hardening and tempering steels, intermetallic phases, titanium based light metals and the like by metal injection molding (MIM) with full material utilization and no or only with little rework.
  • MIM metal injection molding
  • a metal powder is first mixed with a binder of thermoplastics and waxes to form a flowable material that can be processed in an injection molding process (feedstock). From the molded part produced during injection molding, the green compact, the binder is then dissolved out or thermally expelled, so that a porous - called B Hurnling - molding is available, which has the same dimensions as the green body.
  • the browning is sintered slightly below the melting temperature of the respective metal in a sintering furnace, usually in a protective gas atmosphere or sometimes in a vacuum. After sintering, in which the browning shrinks to the desired finished dimensions, the final molded part is present. A rework is generally not required.
  • the US 2007/0202000 A1 describes a method for joining two components produced by metal powder injection molding, in which the two components to be joined have a different shrinkage during sintering.
  • the two components have form-fitting interlocking projections or recesses. During sintering, that component which encloses the projections of the other component exerts a pressure on these projections. The subsequent connection of the two components is primarily ensured by the projections.
  • the invention has for its object to provide further methods for metal powder injection molding of geometrically complex shaped, composed of separately prefabricated B Hurnlingen components in which an intimate, firm connection is achieved during the sintering process between the joined B Hurnlingen.
  • the invention provides that at least one of the B syndromenlingsteil sese to be joined undergoes a pre-sintering process in which it undergoes a first shrinkage.
  • this first shrinkage is less than the maximum shrinkage that the Bhoffnlingsteil FIFA can experience by sintering.
  • the at least one presintered and thus preshrunk Bhoffnlingsteil rave and at least one other Bhoffnlingsteil familia are then assembled into a two- or multi-part B Hurnling. Subsequently, the two- or multi-part Braunling undergoes a main sintering process.
  • the at least one pre-sintered B syndromesteil undergoes less shrinkage than the at least one further Bhoffnlingsteil amino acid, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, amino acid sequence, and the at least one further B syndrome.
  • the non-pre-sintered brown compact section shrinks more than the pre-sintered brown compact section, thereby providing pressure to the surfaces to be joined.
  • the stronger shrinking B Hurnlingsteil Gi is automatically pressed to the less shrinking B Hurnlingsteil Gi so that always a Nullspaltrise and an intimate connection between the Bhoffnlingsteil familiaen is guaranteed.
  • complex components can be provided in high quality.
  • the method is suitable, for example, for producing thermally stressed engine components with a geometrically complex structure.
  • a presintered B syndromenlingsteil and another B syndromenlingsteil
  • form-fitting interlocking fasteners are interconnected before the main sintering process.
  • the Bakinlingteil vorzufinternde before passing through the pre-sintering process has dimensions such that it is not connectable to the other Bhoffnlingsteil familia, and shrinks in the pre-sintering process such that the two Bhoffnlingsteil devise can now be connected via the interlocking fasteners.
  • the B syndromenlingsteil vorzufinternde is thus provided with a connecting element such that a fit with the other B syndromenlingsteil Partners is guaranteed only after pre-sintering.
  • the two components are then finished sintered, wherein the non-presintered component shrinks more than the pre-sintered component.
  • connection elements of the B syndromenlingsteil sese is according to an embodiment of the invention to form-fitting interlocking projections and Recesses. It is provided that the projections taper towards the main body of the Bhoffnlingsteil familias and this example, dovetail-shaped or club-shaped. The recesses of the other Bhoffnlingsteil familias have a matching complementary shape.
  • the projections are formed on that B Hurnlingsteil published which is pre-sintered, and the recesses are formed on the further B Hurnlingsteil consultancy. That is, in the main sintering process, the brown compact section having the recesses and enclosing the protrusions of the other brown compact section exerts pressure on these protrusions.
  • the resulting connection of the two components is primarily ensured by the projections and is essentially limited to the region of the projections and recesses.
  • the recesses are formed on that B Hurnlingsteil published which is pre-sintered, and the projections are formed on the further Bhoffnlingsteil.
  • This embodiment causes, on sintering the composite tanning bristle, the tanning portion having recesses to the tanning portion having projections is attracted by its more shrinking projections, whereby the respective contact surfaces between the Bhoffnlingsteil Anlagenen pressed together.
  • the surfaces on which the Bhoffnlingsteil developede are drawn together during sintering of the composite B Hurnlings, be arranged substantially parallel to each other, which includes a common curvature.
  • the projections are convexly curved and the recesses concavely curved, for example in the form of spherical or lobe-shaped projections and recesses.
  • a further embodiment of the invention provides that at least three B syndromenlingsteil developede are assembled and sintered together in the main sintering process.
  • one of the B syndromenlingsteil developede represents a connecting part, which is composable before the main sintering process with two more of the Bhoffnlingsteil developede.
  • the connecting part has for this purpose two connecting elements, for example in the form of projections or recesses. It is now either pre-sintered as part of the Bhoffnlingsteil familia or the two further Bhoffnlingsteilges are pre-sintered.
  • the two further Braunling sections are connected to each other by means of the Bhoffnlingsteil Federations formed as a connecting part for the main sintering process.
  • both brown compact sections are intimately connected to the brown compact section serving as a connecting part, so that they are intimately connected to one another via the connecting part.
  • the connecting part can be designed, for example, as an insert part (so-called "insert") which essentially has the shape of two recesses which are formed in the brown compact sections to be connected. It can be provided that the connecting part in the main sintering process pulls the other two B Hurnlingsteilges each other and thereby a large area a Nullspaltrich between contact surfaces of the adjacent Bhoffnlingsteil unitede is achieved.
  • insert part so-called "insert”
  • the inventive method can also be used with rotationally symmetrical components.
  • the composite brown compact comprises an inner brown compact section and an outer brown compact section surrounding this with or without connecting elements.
  • the outer B Hurnlingsteil GmbH is not pre-sintered B Hurnlingsteil Gi.
  • the outer brown compact section is pressed against the inner brown compact section.
  • the at least one presintered B syndromenlingsteil Partners pre-sintering a volume shrinkage of at least 2% experiences. This ensures the creation of a sufficient pressure between the surfaces to be joined in the main sintering process.
  • An advantage of the method according to the invention is that due to the inventive concept of pre-sintering at least one of the Bhoffnlingsteil developede a different shrinkage of Bhoffnlingsteil ravee is achieved during the main sintering process, even if the Bhoffnlingsteilgnae to be joined consist of the same material and have substantially identical shrinkage properties. Accordingly, according to one embodiment, the invention is realized with sections which consist of the same material, have the same binder shares and thus have substantially identical shrinkage properties. The use of different materials, which is associated with an additional cost along the process chain and thus increased component costs, is avoided.
  • the invention can in principle also be realized with brown compact sections which have different shrinkage properties even without presintering of one of the brown compact sections in the sintering process.
  • one or more of the Braunling sections including the Bhoffnlingsteilzusszuszusternden, consist of different metal powders in the sense that the metal powder used on the nature and / or size of the metal powder particles, in the metal powder material and / or in terms of the binder used differ. Different metal powders in this sense are present in particular if the metal powder particles are of different types and / or sizes, but also if only the binder used is different or added to varying degrees to the metal powder particles used.
  • a method for producing components by metal powder injection molding in which at least three brown compact sections are assembled and then sintered together in a sintering process.
  • One of these B Hurnlingsteil adoptede is a connecting part, which is assembled before the sintering process with at least two further Braunlingsteil raveen. This formed as a connecting part B Hurnlingsteil who undergoes during the sintering process in comparison to the other Bhoffnlingsteil raveen higher or lower shrinkage, whereby the at least two further Bhoffnlingsteil developede are firmly connected to each other via the connecting part.
  • the connecting part and the other B syndromenlingsteil Federatione consist of the same material and have substantially identical shrinkage properties.
  • either the connecting part or the further Braunling sections undergo a pre-sintering process before the sintering process, by a pre-shrinkage takes place.
  • the method of the second aspect of the invention is also applicable using a connecting part, which has other shrinkage properties due to its material composition than the Bhoffnlingsteiluitee to be joined together. For example, it differs in type and / or size of the metal powder particles and / or in the metal powder material and / or in the binder used by the other Braunling sections.
  • the connecting part is designed, for example, as an insert part, which has two projections which are arranged essentially completely in two corresponding recesses of the brown body sections to be connected to one another. If the insert has a greater shrinkage than the B Hurnlingsteil GmbHe to be joined together, it draws during sintering the latter together, which experience a large area a pressure along their contiguous contact surfaces. If the insert has a lower shrinkage than the B Hurnlingsteil developede to be joined together, these Bhoffnlingsteil developede exert pressure on the projections of the insert during sintering, the subsequent connection of the two components is primarily ensured by the projections.
  • FIG. 1 schematically shows two B syndromenlingsteil developede 5, 6.
  • the two B syndromenlingsteil developede are made of identical materials, so have the same shrinkage properties in a sintering process.
  • To produce the Braunling sections 5, 6, separate green compacts are produced by metal powder injection molding of a metal powder mixed with a thermoplastic binder ("feedstock"). By melting out of the binder in an oven, the green bodies are then debinded, so that now existing from a porous material Bhoffnlingsteil developede 5, 6 are available.
  • the one Braunling section 6 has on its outer surface a projection 7.
  • the projection 7 is formed in the illustrated embodiment, but not necessarily dovetailed. Its side surfaces 75 taper in the direction of the main body of the Bhoffnlingsteil Switzerlands 6.
  • the other B syndromenlingsteil Federation 5 has a recess 8, the shape of which corresponds to the shape of the projection 7 and, accordingly, also dovetail-shaped.
  • the projection 7 and the recess 8 are form-fitting interlocking connecting elements of the two Bhoffnlingsteilges 5, 6 represents.
  • the form-fitting interlocking connecting elements can be provided in other ways, for example by concave and convex shapes.
  • the one Braunling section 6 before a positive connection with the B syndromenlingsteil Salt 5 passes through a pre-sintering process in which its volume from a first, larger volume 61 to a second, smaller volume 62 shrinks. Accordingly, the outer dimensions of the projection 7 shrink from a larger outer dimension 71 to a smaller outer dimension 72.
  • the shrinkage process is schematically represented by arrows.
  • the size of the projection 7 and the recess 8 are adapted to each other so that only after passing through the pre-sintering process, the projection 7 can be introduced into the recess 8, while this was not possible before passing through the pre-sintering process.
  • the B Hurnlingsteil 5, 6 are shifted longitudinally to each other, wherein the projection 7 in positive engagement with the recess 8 device.
  • FIG. 2 shows an alternative embodiment, which differs from the embodiment of FIG. 1 differs in that the B syndromenlingsteil Suite 5 having the recess 8, passes through a pre-sintering process and thereby shrinks from a larger volume 51 to a smaller volume 52. Accordingly, the surface within the recess also changes from a surface 81 to a surface 82.
  • presintering the brown compact section 5 the two brown compact sections 5, 6 are connected to one another in a form-fitting manner via their connecting elements 7, 8. This is followed by a main sintering process in which the two browning sections 5, 6 are sintered simultaneously.
  • FIG. 3 shows a possible embodiment of the in the Figures 1 and 2 illustrated technical teaching. It is shown a non-rotationally symmetrical engine component in the form of a turbine blade 1.
  • the turbine blade 1 is composed of three separately produced by metal powder injection molding and then sintered in a sintering process and interconnected Bhoffnlingsteil GmbH. The three sintered Bhoffnlingsteil developede form an airfoil 2, an outer shroud 3 and an inner shroud 4 of the turbine blade. 1
  • FIG. 4 shows the state after one of the two B syndromenlingsteil developede was pre-sintered and connected to the other Bhoffnlingsteil familia.
  • the Bhoffnlingsteil In the considered embodiment, the Bhoffnlingsteil laminate 6, which has the recesses 8, pre-sintered. This means that in the subsequent common sintering of the Bhoffnlingteil developede 5, 6 positively connected by means of the recesses 8 and projections 7, the Bhoffnlingsteil familia 5 shrinks more.
  • the contact surfaces 10, 11, which are formed adjacent to the projections or recesses 7, 8, are formed in a configuration substantially parallel, which includes that they form curved surfaces in the same way. As a result, a large-scale intensive pressing process is ensured during sintering.
  • FIG. 5 shows an embodiment in which three Braunling sections 5a, 5b and 12 are joined together in a sintering process.
  • the Bhoffnlingsteil Division 12 is formed in the form of an insert having two circular or lobe-shaped projections 12a, 12b, which are arranged in corresponding recesses 8a, 8b of the Bhoffnlingsteil proposede 5a, 5b.
  • the insert 12 serves as a connecting part for connecting the two B Hurnlingsteil 5a, 5b in a sintering process. It is provided that the insert 12 in comparison to the Bhoffnlingsvons 5a, 5b in the sintering process a experiences higher or lower shrinkage. This can be achieved, on the one hand, by virtue of the insert part 12 having different shrinkage properties due to a different choice of material. For example, the type and / or size of the metal powder particles are different and / or a different binder or amount of binder is used. Because of these inherent different material properties, the brown compact section 12 serving as the insert undergoes a different shrinkage in the sintering process.
  • a different shrinkage of the insert part 12 may according to the embodiment of Figures 1 and 2 but also be achieved in that either the insert part 12 or the B Hurnlingsmaschines 5a, 5b experience a pre-sintering, which also leads to the fact that the insert 12 and the B Hurnlingsteil 5a, 5b undergo shrinkage in the main sintering process in different ways.
  • the insert part 12 provision is made for the insert part 12 to experience greater shrinkage in the sintering process than the brown body sections 5a, 5b.
  • the two B Hurnlingsers 5a, 5b are not only firmly connected to each other via the insert 12, but while the insert 12 pulls the B Hurnlingsers 5a, 5b together, so that they are pressed together along their contact surfaces 10, 11.
  • the insert 12 experiences a shrinkage in the sintering process, which is less than the shrinkage experienced by the Bönlingsteil 5 a, 5 b.
  • a connection between the respective Braunling sections 5a, 5b and the insert 12 substantially in the region of the projections 12a, 12b.
  • the invention is not limited in its embodiment to the above-described embodiments, which are only to be understood as examples.
  • the shapes and dimensions of the recesses and recesses of the individual Bhoffnlingsteil developede are merely exemplary understood. It can also be provided that Bhoffnlingsteil grise to be joined together have a plurality of corresponding projections and recesses.
  • FIG. 3 described embodiment of an engine component is to be understood as exemplary only.
  • the invention can be realized in any components, in particular engine components, which consist of different, resulting from metal powder injection molding components, engine components can be made with geometrically complex structure.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Powder Metallurgy (AREA)
EP12198188.0A 2011-12-20 2012-12-19 Procédé destiné à la fabrication d'un composant par moulage par injection de poudre métallique Active EP2606997B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011089260A DE102011089260A1 (de) 2011-12-20 2011-12-20 Verfahren zur Herstellung eines Bauteils durch Metallpulverspritzgießen

Publications (2)

Publication Number Publication Date
EP2606997A1 true EP2606997A1 (fr) 2013-06-26
EP2606997B1 EP2606997B1 (fr) 2019-12-18

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US (1) US9950370B2 (fr)
EP (1) EP2606997B1 (fr)
DE (1) DE102011089260A1 (fr)

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DE102011089260A1 (de) 2013-06-20

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