EP1133374B1 - Procede pour la production d'une piece frittee avec formage ulterieur de l'ebauche - Google Patents

Procede pour la production d'une piece frittee avec formage ulterieur de l'ebauche Download PDF

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Publication number
EP1133374B1
EP1133374B1 EP99955898A EP99955898A EP1133374B1 EP 1133374 B1 EP1133374 B1 EP 1133374B1 EP 99955898 A EP99955898 A EP 99955898A EP 99955898 A EP99955898 A EP 99955898A EP 1133374 B1 EP1133374 B1 EP 1133374B1
Authority
EP
European Patent Office
Prior art keywords
green compact
pressing
sintered
component
deformation
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
EP99955898A
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German (de)
English (en)
Other versions
EP1133374A1 (fr
Inventor
Eberhard Ernst
Bernhard Brust
Berthold Morber
Wolfgang Schiemenz
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.)
GKN Sinter Metals GmbH
Original Assignee
GKN Sinter Metals 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 GKN Sinter Metals GmbH filed Critical GKN Sinter Metals GmbH
Publication of EP1133374A1 publication Critical patent/EP1133374A1/fr
Application granted granted Critical
Publication of EP1133374B1 publication Critical patent/EP1133374B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H5/00—Making gear wheels, racks, spline shafts or worms
    • B21H5/02—Making gear wheels, racks, spline shafts or worms with cylindrical outline, e.g. by means of die rolls
    • B21H5/022—Finishing gear teeth with cylindrical outline, e.g. burnishing
    • 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
    • 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
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • B30B15/022—Moulds for compacting material in powder, granular of pasta form
    • 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
    • B22F3/164—Partial deformation or calibration
    • B22F2003/166—Surface calibration, blasting, burnishing, sizing, coining
    • 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 a sintered component made of powdery material, in particular made of sintered metallurgical powder, the component being a Has external and / or internal teeth.
  • Some of the problems can be solved solve in that the finished component of two or more for pressed and sintered elements becomes a raw part or by pressing and sintering is generated, which is then in a chip-forming process still has to be finished.
  • a structure a component made up of several sub-elements cannot be created always realize. Machining a finished sintered component is particularly in a series production expensive.
  • DE-A-196 36 524 describes a process for the production of Prototype known, in which with the help of a press tool an at least one-step basic molding process from binder metal powder containing a green compact as a basic component shape is formed under the influence of pressure and / or heat, which only approximates the final shape of the component. In at least another, material-removing or material-forming The molding process then gives the green compact a first component shape given and then sintered. The so created The prototype is examined with regard to the necessary ones Changes in shape to take into account the influences of the sintering process with regard to its suitability for the intended mechanical use. Here is the reduction in particular the amount of material, d. H. a slimmer form of Interest.
  • the first prototype created in this way another does not meet all requirements
  • a green body from the existing pressing tool created according to those obtained from the investigation Knowledge revised, sintered and again is examined. This makes it possible to use just one mold to gradually develop the necessary final component shape and based on the final sample obtained in this way, then for series production to produce the necessary pressing tools.
  • a molding process for the production of a sintered component already with the basic molding process to connect a method is described in EP 826 449 in the case of several separate, one after the other Press stamping a green body in a press tool its final shape is formed from powder material, whereby Cross-sectional contours with different degrees already during pressing Material thicknesses, such as wheel hubs and wheel rims can be molded on. Requirement is, that the component has no undercuts in its geometry has, so that it comes out of the press tool after pressing is removable.
  • this method can be used for any geometry insert without undercuts when the press tool is adapted to the contours accordingly. Indeed it has been shown that only with bodies with surfaces that are in the essentially perpendicular to the direction of movement of the pressing tools are aligned, achieved a uniform compression can be. As soon as the component to be manufactured by this Basic condition has different geometries, the described described bumps Process to its technical limits.
  • GB-A-2 051 639 describes a process for the production of Threaded spindles are known, first of all from a sintered metal powder a green compact is pressed in the form of a cylinder body and then sintered. After that, by reshaping the cylinder outer surface of the sintered cylinder body with Using a form roller, the thread is applied, being in the area of the threads significantly densifies the surface becomes. Then the threaded rod or Bolts are sintered.
  • From CH-A-335 196 is a process for the manufacture of bullet rings known from iron powder, in which the ring is pre-pressed and is pre-sintered and subsequently for adjustment pressed to a defined density and sintered again becomes. Because bullet rings made out of cylindrical smooth rings are formed, the re-pressing only causes calibration, in order to avoid excessive structural compaction as far as possible.
  • the object of the invention is to provide a method avoids the disadvantages described above.
  • the object is achieved by that specified in claim 1 Process for producing a component from a sintered metallurgical Powder.
  • This procedure caters for a variety of geometries the advantage that the green body for the Basic component shape in a correspondingly simplified, on a uniform compression designed press tool manufactured can be. It is useful if the basic component shape in their geometry the geometry of the final component shape as possible comes close.
  • the special final shape is then by at least one further separate forming the relevant sections of the green body with the help of a generated another forming tool.
  • the sub-areas to be reshaped in separate Forming tools can be pressurized Areas that were less densely compressed in the first pressing step become clogged.
  • Geometries in the sub-areas of the basic component shape be shaped.
  • the forming tools are with pressure and counter pressure media fitted. With these procedures can an isostatic pressure component on the to be reshaped Partial areas are transferred that even with very brittle material deformability is still possible.
  • By reshaping the relevant part of the green compact becomes the final component shape manufactured, which are then sintered can.
  • this can Forming by pressing and / or rolling. Forming can in particular be carried out in stages, whereby individual contours, such as undercuts on the final component shape, each generated at least by one forming step become.
  • the forming depth is gradual is increased. It is achieved that without destruction the material structure has done more forming can be.
  • the green body before at least one forming is pre-sintered to increase the green strength.
  • This called pre-sintering joining of the powdered and pressed Powder material is preferably at a lower Temperature made than that leading to the final component shape High Intern.
  • the pre-sintering is carried out in such a way that further forming work on the component is still possible is. Pre-sintering ensures that the inner structure of the molding in the areas that have already been finally formed largely retained when reshaping parts and a higher pressure on these sections for forming can be applied.
  • the component can be a green body before sintering and / or calibrated as a solidified part after sintering become.
  • at least part of the forming work by calibrating Afford.
  • calibrating the surface however also the structure of the component can be qualitatively improved. It is particularly possible to have burrs and / or points eliminate sharp edges.
  • pinion 1 is shown in longitudinal section, the one has cylindrical base body 2 with at one end an external toothing 3 is provided. As can be seen in FIG. 1 lets, the teeth 4 of the external teeth 3 are so-called Arch teeth formed.
  • the component is in the sintering process made from a sintered metallurgical powder.
  • FIG. 1 shows the component in the final sintered state.
  • 4, 6 and 7 is the method of manufacture 1 based on the workflow in the press tool shown in more detail.
  • the pressing tool consists essentially from an essentially encompassing the outer contour Die 5, a lower stamp 6 and an upper form stamp 7.
  • the lower stamp 6 is initially filled by a predetermined dimension lowered and the mold space thus formed with sintered metallurgical powder 8 filled.
  • the Form stamp 7 lowered, the outer contour 9 substantially corresponds to the inner contour 10 of the upper region of the die 5.
  • 3 shows an end view of the die 7.
  • the die 7 inserted into the die 5 and simultaneously the lower stamp 6 moves upward, so that the stamp and lower stamps are guided against each other and the only poured powder filling into a solid green compact 1.1 compacted.
  • the cylindrical base body 2 already receives its final shape, while the teeth 4 of the external toothing 3 in its lower area 4.1 due to the corresponding Shape of the die 5 already have the curved tooth course, while the upper area 4.2 the contour of a normal one Has straight teeth.
  • the intermediate shape of the green compact thus produced is from FIG. 5 seen.
  • the green compact 1.1 is in one second work step used in a die 5.1, the has a lower stamp 6.1, and its shape space essentially is formed by a tooth mold space 11.1 which in its geometry corresponds to the area 4.1 on the green compact (FIG. 2).
  • An upper die-shaped pressing tool 5.2 is with a Tooth form space 11.2 provided, which is identical to area 4.1 on Green compact (Fig. 5) is formed and which serves the area 4.2 on the green compact, which is also designed as a straight toothing to be reshaped so that this tooth area is the one shown in FIG Receives final contour.
  • the upper matrix-shaped - Tool 5.2 is assigned an inner punch 12 so that the Lower stamp 6.1 and the inner stamp 12 when moving together the entire tool assembly can be performed so that apart from the reshaping of the external teeth, no relative displacements of the green body between the two tools 5.1 and 5.2. This pressing situation is shown in Fig. 7.
  • FIG. 8 shows a perspective view of one Ring 13 with an external toothing 14, as it is for example used as a clutch body in a manual transmission place.
  • the individual teeth 15 of the external toothing 14 not designed as normal straight teeth, but have a complicated geometric shape.
  • the Tooth flanks 15.1 are shaped as involute surfaces however - as FIG. 10 shows - at an angle to one another.
  • the end face 16 is straight, while the End face 17 by two inclined to each other, however flat surface areas 17.1 is formed.
  • FIG. 11 is a green compact as a further design example 18 shown for a ring with internal teeth.
  • the Green body shown in Fig. 11 is analogous to that based on 2 and 4 described method as the basic component shape manufactured.
  • 11 is on a ring body 18.1 only one tooth 19 of the internal toothing in a side view and in Fig. 12 are a plurality of teeth 19 in a processing of the internal toothing shown in a supervision.
  • Such a contoured green body can be in one first pressing step analogous to the representation according to FIGS. 2 and 4 produce as basic component shape including the special one Contouring the teeth 19.
  • a tooth shape with undercuts as shown in Fig. 13 is shown.
  • This tooth shape can be made by a pure one Pressing process because of the undercuts on both sides 20 no longer generate on the tooth flank.
  • this is after the inventive method by a forming process possible, which - as indicated in Fig. 14 - by rolling or rolling is possible.
  • the green compact 18 is opened held a rotatable counter element 21, for example on a roller or in a support ring.
  • the undercuts 20 are then with an appropriately shaped rolling tool 22 as a pressure element that occurs when the counter element rotates 21 rolls on the inner surface of the toothing, by Forming manufactured.
  • the undercuts 20 are shown coarsened in FIG. 13. In practical application it is by only slight depressions compared to the adjacent ones Areas of the tooth flanks.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Ceramic Products (AREA)

Claims (5)

  1. Procédé pour la fabrication d'une roue dentée ou d'une bague dentée frittée par formage d'une ébauche de compact à partir d'une poudre métallurgique à fritter, qui est ensuite frittée, dans lequel dans une première étape on forme l'ébauche de compact par formage à la presse de la poudre métallurgique à fritter au moyen d'outillages de compression à guidage axial, selon une forme de base de pièce dont la géométrie correspond pour l'essentiel à la forme finale de pièce, à l'exception de zones partielles des dents qui, dans les outillages de compression de la première étape présentent des géométries ne pouvant pas ou difficilement être formées, et dans au moins une autre étape, au moyen d'outillages de transformation particuliers, par transformation sans enlèvement de copeaux au niveau de l'ébauche de compact, on transforme sous pression les zones partielles des dents dont la géométrie n'a pas été formée définitivement dans le premier outillage de compression, pour leur conférer leur forme finale, de telle sorte que l'ébauche de compact non frittée reçoit la forme finale de pièce, et l'ébauche de compact dans sa forme finale de pièce étant ensuite frittée pour obtenir la pièce finie.
  2. Procédé selon la revendication 1, caractérisé en ce que la transformation des zones partielles est réalisée par compression et/ou roulage.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la transformation est réalisée par étapes, différents contours, notamment des contre-dépouilles sur la forme finale de pièce, étant obtenus à chaque fois au moins par une étape de transformation.
  4. Procédé selon l'une quelconque ou plusieurs des revendications 1 à 3, caractérisé en ce que l'ébauche de compact est pré-frittée avant au moins une transformation pour augmenter la résistance à vert.
  5. Procédé selon l'une quelconque ou plusieurs des revendications 1 à 4, caractérisé en ce que la pièce est calibrée en tant qu'ébauche de compact avant un frittage et/ou en tant que pièce préfabriquée après un frittage.
EP99955898A 1998-11-02 1999-10-28 Procede pour la production d'une piece frittee avec formage ulterieur de l'ebauche Expired - Lifetime EP1133374B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19850326 1998-11-02
DE19850326A DE19850326A1 (de) 1998-11-02 1998-11-02 Verfahren zur Herstellung eines gesinterten Bauteils mit Nachverformung des Grünlings
PCT/EP1999/008189 WO2000025960A1 (fr) 1998-11-02 1999-10-28 Procede pour la production d'une piece frittee avec formage ulterieur de l'ebauche

Publications (2)

Publication Number Publication Date
EP1133374A1 EP1133374A1 (fr) 2001-09-19
EP1133374B1 true EP1133374B1 (fr) 2004-04-14

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EP99955898A Expired - Lifetime EP1133374B1 (fr) 1998-11-02 1999-10-28 Procede pour la production d'une piece frittee avec formage ulterieur de l'ebauche

Country Status (9)

Country Link
US (1) US6730263B2 (fr)
EP (1) EP1133374B1 (fr)
JP (1) JP2002528644A (fr)
AT (1) ATE264153T1 (fr)
AU (1) AU1266800A (fr)
CA (1) CA2348429C (fr)
DE (2) DE19850326A1 (fr)
ES (1) ES2221459T3 (fr)
WO (1) WO2000025960A1 (fr)

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DE10203283C5 (de) * 2002-01-29 2009-07-16 Gkn Sinter Metals Gmbh Verfahren zur Herstellung von gesinterten Bauteilen aus einem sinterfähigen Material und gesintertes Bauteil
FR2866254B1 (fr) * 2004-02-17 2006-06-09 Fed Mogul Operations France Sa Procede de fabrication de pieces mecaniques frittees
US7237730B2 (en) * 2005-03-17 2007-07-03 Pratt & Whitney Canada Corp. Modular fuel nozzle and method of making
WO2008073952A2 (fr) * 2006-12-12 2008-06-19 Gkn Sinter Metals, Llc Forgeage de métal en poudre, procédé et appareil de production
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EP2131995B1 (fr) * 2007-04-04 2017-06-07 Gkn Sinter Metals, Llc Forgeage de métal en poudre et procédé de fabrication associé
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JP6751251B2 (ja) * 2015-10-15 2020-09-02 セイコーエプソン株式会社 三次元造形物の製造方法及び三次元造形物の製造装置
CN209524062U (zh) * 2019-01-29 2019-10-22 浙江春风动力股份有限公司 一种花键齿、齿轮接合机构及变速箱
CN113646113A (zh) * 2019-04-24 2021-11-12 住友电气工业株式会社 烧结体的制造方法及压粉成型体
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Also Published As

Publication number Publication date
WO2000025960A1 (fr) 2000-05-11
AU1266800A (en) 2000-05-22
CA2348429C (fr) 2009-07-28
US6730263B2 (en) 2004-05-04
EP1133374A1 (fr) 2001-09-19
DE59909201D1 (de) 2004-05-19
US20020090314A1 (en) 2002-07-11
JP2002528644A (ja) 2002-09-03
DE19850326A1 (de) 2000-05-04
CA2348429A1 (fr) 2000-05-11
ATE264153T1 (de) 2004-04-15
ES2221459T3 (es) 2004-12-16

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