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WO2008003660A1 - Procédé de moulage par injection de poudre métallique - Google Patents

Procédé de moulage par injection de poudre métallique Download PDF

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Publication number
WO2008003660A1
WO2008003660A1 PCT/EP2007/056605 EP2007056605W WO2008003660A1 WO 2008003660 A1 WO2008003660 A1 WO 2008003660A1 EP 2007056605 W EP2007056605 W EP 2007056605W WO 2008003660 A1 WO2008003660 A1 WO 2008003660A1
Authority
WO
WIPO (PCT)
Prior art keywords
component
metal powder
point
powder injection
metal
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.)
Ceased
Application number
PCT/EP2007/056605
Other languages
German (de)
English (en)
Inventor
Dieter Holz
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2008003660A1 publication Critical patent/WO2008003660A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • 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
    • 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
    • B22F3/115—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by spraying molten metal, i.e. spray sintering, spray casting
    • 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
    • B22F3/16—Both compacting and sintering in successive or repeated steps
    • B22F3/162—Machining, working 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
    • 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 metal powder injection molding process according to the preamble of claim 1.
  • a metal powder injection molding (MIM - metal injection molding) is described, in which a metal powder, which consists of metal particles of a defined grain size, is first prepared by means of a binder means in which the individual powder particles are coated in the metal powder. Subsequently, the metal powder is injected into a tool.
  • the resulting molding material - also called feedstock - is one
  • the invention has for its object to produce a component which is produced using the metal powder injection molding process, with high surface quality and high strength.
  • the component is first produced by the metal powder injection molding process.
  • the sinterable molding compound which consists of a metal powder with metal particles defined grain size, first injected into a prefabricated tool, then the binder is removed in the molding material and then the molding material is sintered in a thermal process.
  • the component obtained has a certain surface quality and also a certain strength which already meets high requirements.
  • the component is after sintering at defined points of a deformation to achieve a local Subjected to compaction on the component.
  • This forming process is an additional, downstream process step to which the component is subjected.
  • the targeted forming a partial, possibly complete elimination of pores on the aftertreated surfaces of the component can be achieved, at the same time the strength of the component is increased at these locations.
  • the surface quality and the strength is improved, namely at the desired locations on the component, which should have just these required material properties.
  • the local compaction achieves closing or eliminating the pores at these points, which makes the surface smoother and thus the surface quality better.
  • the compression also causes an increase in the strength of the material.
  • These improved properties can be achieved with a relatively low conversion effort, which would otherwise be accomplished - only by improvements in metal powder injection molding - with a greater effort and additional cost, for example by using a finer metal powder or by higher temperatures or by adding additional additives.
  • such improvement measures in the metal powder injection molding process are in principle possible, but not necessarily a prerequisite for the local improvement of the material properties at the desired locations.
  • embossing volume is already applied to the component at the point during the metal powder injection molding process, which is then subjected to the shaping process.
  • This embossing volume is completely or partially compressed by the deformation and thus reduced until the desired surface geometry and topography is achieved.
  • the embossing volume thus represents a buffer volume for the subsequent forming process.
  • the deformation can be carried out on one side, ie only on the side which is to have the desired surface structure, as well as on two sides, ie in addition to the opposite outside of this point of the component.
  • the one-sided forming has the advantage of a relatively fast and easy to perform process step. With the two-sided forming, on the other hand, a further improved surface quality and, in particular, increased strength are achieved at this location of the component, since the compression extends deeper into the material of the component in comparison with the one-sided deformation.
  • metal powders can be used for the production of the component, for example fine metal powders with a particle size smaller than 20 ⁇ m or even coarser metal particles with a particle size between 20 ⁇ m and 150 ⁇ m.
  • metal powder As a material for the metal powder all sinterable metals and metal alloys can be used.
  • Fig. 1 shows a section through a component which in the
  • FIG. 2 is a view of another component, which is provided at a location on the inside and on the outside for forming,
  • Fig. 3 shows another embodiment with a component which is to be formed only on one side.
  • a component 1 which has been produced by means of metal powder injection molding and then subjected to a transformation process.
  • a sinterable molding compound consisting of a metal powder with added Binder agent is injected into a tool, then the binder is removed from the molding compound and then it is sintered in a thermal process.
  • 1 pores 4 can arise in the metal of the component, which lead to the surface of the component to an undesirable quality degradation.
  • the component 1 is subjected to a deformation at a defined point 2, which is shown by the exaggerated indentation at the point 2.
  • the near-surface region 3 of the component is mechanically compacted, which leads to a complete or at least partial elimination of the pores in the material of the component.
  • improved surface quality and increased near-surface strength 3 are obtained.
  • Forming process is to be able to provide the near-surface region 3 at the point 2 with a desired, defined geometry structure which is embossed into the surface.
  • the surface of the component 1 can be provided in the region of the point 2 with additional desired properties, for example with a reduced friction.
  • FIGS. 2 and 3 show further components 1, which are produced in the metal powder injection molding process and subsequently locally subjected to deformation at point 2.
  • the component 1 in FIGS. 2 and 3 is expediently the sealing seat for an injection valve in an internal combustion engine.
  • the component 1 is only partially shown, can be seen the longitudinal axis 8 of the preferably rotationally symmetrical component 1.
  • the point 2 to be reshaped on opposite outer sides of the component in each case a Pragevolumen 5 and 6, which represents a buffer for the transformation.
  • the reshaping takes place plastically, wherein the embossing volume 5 and 6 are each printed together, so that the surface integrates on both opposite sides gleichschreibig and without exaggeration in the adjacent surfaces of the component. Due to the forming on both opposite outer sides at the point 2 of the component, a deep compaction of the material is achieved, which is exemplified with the hatched area 7 between the Pragevolumen 5 and 6.
  • the exemplary embodiment according to FIG. 3 differs from the preceding one in that only one embossing volume 6 is provided on one side of the point 2 to be reshaped.
  • the component 1 is formed only on one side in the region of the embossing volume 6.
  • a different cross-sectional geometry of the compacted region 7 in the material at the formed site results, in that the densification on the near-surface side of the deformation is greatest and is tapered with increasing distance.
  • the compacted region 7 has approximately a funnel shape in cross-section, which is due to the double deformation on both outer sides at the point 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un procédé pour fabriquer une pièce, suivant lequel il est réalisé par injection de poudre métallique, après le frittage, une modification de forme au niveau d'un emplacement défini de la pièce pour obtenir ainsi une densification locale.
PCT/EP2007/056605 2006-07-07 2007-06-29 Procédé de moulage par injection de poudre métallique Ceased WO2008003660A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006031505.7 2006-07-07
DE102006031505A DE102006031505A1 (de) 2006-07-07 2006-07-07 Metallpulver-Spritzgießverfahren

Publications (1)

Publication Number Publication Date
WO2008003660A1 true WO2008003660A1 (fr) 2008-01-10

Family

ID=38521496

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/056605 Ceased WO2008003660A1 (fr) 2006-07-07 2007-06-29 Procédé de moulage par injection de poudre métallique

Country Status (2)

Country Link
DE (1) DE102006031505A1 (fr)
WO (1) WO2008003660A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5993507A (en) * 1997-12-29 1999-11-30 Remington Arms Co., Inc. Composition and process for metal injection molding
EP0995525A1 (fr) * 1998-05-07 2000-04-26 Injex Corporation Procede pour realiser un produit fritte
US6309592B1 (en) * 2000-04-05 2001-10-30 Lite-On It Corporation Method for manufacturing roller carrier of vibration balance device
US20020098105A1 (en) * 2001-01-24 2002-07-25 Scimed Life Systems, Inc. The processing of particulate Ni-Ti alloy to achieve desired shape and properties

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5993507A (en) * 1997-12-29 1999-11-30 Remington Arms Co., Inc. Composition and process for metal injection molding
EP0995525A1 (fr) * 1998-05-07 2000-04-26 Injex Corporation Procede pour realiser un produit fritte
US6309592B1 (en) * 2000-04-05 2001-10-30 Lite-On It Corporation Method for manufacturing roller carrier of vibration balance device
US20020098105A1 (en) * 2001-01-24 2002-07-25 Scimed Life Systems, Inc. The processing of particulate Ni-Ti alloy to achieve desired shape and properties

Also Published As

Publication number Publication date
DE102006031505A1 (de) 2008-01-17

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