EP0682999B1 - Article moulé, procédé et installation pour sa préparation - Google Patents

Article moulé, procédé et installation pour sa préparation Download PDF

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Publication number
EP0682999B1
EP0682999B1 EP95105492A EP95105492A EP0682999B1 EP 0682999 B1 EP0682999 B1 EP 0682999B1 EP 95105492 A EP95105492 A EP 95105492A EP 95105492 A EP95105492 A EP 95105492A EP 0682999 B1 EP0682999 B1 EP 0682999B1
Authority
EP
European Patent Office
Prior art keywords
blank
undercut
pressing
sintered
sizing
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
EP95105492A
Other languages
German (de)
English (en)
Other versions
EP0682999A3 (fr
EP0682999A2 (fr
Inventor
Rainer Dipl.-Ing. Schmitt
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 EP0682999A2 publication Critical patent/EP0682999A2/fr
Publication of EP0682999A3 publication Critical patent/EP0682999A3/fr
Application granted granted Critical
Publication of EP0682999B1 publication Critical patent/EP0682999B1/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
    • B22F3/12—Both compacting and sintering
    • B22F3/16—Both compacting and sintering in successive or repeated steps
    • B22F3/164—Partial deformation or calibration
    • 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
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor
    • 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
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • 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

Definitions

  • the invention relates to a metallic sintered part, with at least one across to the undercut lying in the pressing direction, together with the method and device for its production with the Features of the preambles of the independent claims 14, 1 and 8, which are based on US-A-4 164 063.
  • a sintered metal body is known from DE-OS 37 34 002, the undercuts lying transverse to the pressing direction having.
  • the sintered metal body is made up of several parts. The single ones molded parts are put together to form a component and then by applying a layer of magnetite bonded together on their surfaces. This procedure requires due to the multiple parts of the sintered metal body a certain and procedural effort.
  • the undercuts can also through machining into the sintered metal body be introduced.
  • the individual parts of a multi-part Unite sintered metal body by welding or soldering.
  • the powder-metallurgical method according to the invention Pressed or sintered part is characterized by integrally formed undercuts, i.e., the Undercuts are preferred in a pressing process when calibrating, to a pre-pressed one-piece Blank molded.
  • the blank lies in the case of a sintered part already in the sintered state.
  • the above procedure leaves a combination of previously separate pressed individual parts and / or elaborate post-processing omitted. Due to the one-piece of the blank tolerance problems that e.g. by adding an existing oversize or undersize parts to be joined, avoided.
  • the invention Process faster, easier and cheaper carry out.
  • the undercuts on the blank when calibrating molded by material shift.
  • the blank is compacted.
  • a stamp or slide across the blank press and press in the undercut is also a stamp or slide across the blank press and press in the undercut.
  • the bottom of the However undercuts due to the basic shape of the existing one Blanks formed and calibrated for everyone Undercut just a protruding shoulder molded. This is preferably done by an im Blank material stock is moved, creating a protruding shoulder for the undercut is molded.
  • the material is preferably moved by a movable stamp, which in the appropriate place existing material in the blank transverse to the pressing direction in a lateral recess on a die displaced, thereby forming the aforementioned shoulder.
  • the material stock is at least equal in volume large as the recess and both, the material supply and the recess are arranged adjacent.
  • the material stock is somewhat larger in volume than the recess.
  • the Material stock in the blank is used for pressing or Calibrate by penetrating one located on the press ram Intent shifted into the blank.
  • the volume the resolution is at least as big as that later the shoulder-forming recess.
  • the process according to the invention can be carried out in a conventional manner Carry out pressing device.
  • the die adapted to the molding task can be used.
  • This has two or more movable jaws or segments, at least one / one on the pressing surface Recess has the shape and volume of the later the undercut projecting shoulder corresponds.
  • the die can be opened, which also enables the die Undercut is released.
  • a pre-product body is made by powder metallurgy manufactured in which there is an area which is adjacent to the later undercut and which is transverse to the pressing direction during calibration Material reservoir is located, the volume of which is at least corresponds to the volume in the finished sintered body the undercut protruding and limiting shoulder occupies.
  • the pre-product body is turned into an matrix consisting of at least two movable segments, which are caused by moving the segments apart in the open Condition, inserted.
  • This matrix has on its inner wall at least one recess that the intended form of at least one, in the finished Sintered metal part protruding and undercut limiting shoulder is equivalent.
  • the intermediate product body is inserted into the die in such a way that the material reservoir area at the point is located on the corresponding one in the inner wall of the die Recess for the formation of the undercut towering shoulder. Then the Matrix with the pre-product body in at least one a die press having a punch in the pressing position brought, the matrix by means of e.g.
  • the pressed part or the blank can be made of any suitable metal powder exist. It has proven to be beneficial proven if the blank material has an elongation at break of more than 2%, preferably more than 10%. Suitable materials are e.g. SINT D35 (containing phosphorus Steels), SINT D40 (stainless steel) etc.
  • FIG. 1 and 2 show a finished pressed part 7 made of metal powder, preferably in the form of a sintered part. It is preferably made of an alloy steel, but can any other suitable metallic Have composition.
  • the finished pressed or sintered part consists of one Metal that has an elongation at break of more than 2%, preferably has more than 10%.
  • Suitable materials are e.g. SINT D35 (phosphorus-containing steels) or SINT D40 (stainless steels).
  • the finished press part 7 has at least one transverse to Pressing direction undercut 3.
  • Embodiment is two 180 ° opposite undercuts 3 in shape of transverse grooves or troughs.
  • Figure 2 illustrates the training in longitudinal section.
  • the Undercut 3 has a bottom 4 and a projecting one Shoulder 5.
  • the counter shoulder is through here a widened head plate 6 is formed.
  • the pressing part 7 can be designed in any other way his. It can also be an undercut 3 or only three or more undercuts 3 or an annular groove have, which also distributed arbitrarily on the pressing part 7 can be / can be.
  • the finished part 7 receives the undercuts 3 at Calibration of a pre-pressed, in the case of a sintered part one pre-pressed and sintered, from only one Part of existing blank 2 by molding.
  • the Figures 3 to 6 illustrate the shoulders 5 formed by material shift.
  • the calibration process takes place in a press device 1, the below with reference to Figures 7 to 11 in more detail is described and shown.
  • the blank 2 has a simple, by pressing optionally powders provided with a binder and preferably subsequent sintering easy to manufacture Shape.
  • it already has the Head plate 6 and a smooth shaft or pin 22, the the approximately barrel-shaped cross section shown in Figure 1 having.
  • the blank 2 has no finished Undercut 3 transverse to its pressing direction.
  • side walls of the shaft or pin 22 form already the later floors 4 of those shown in Fig. 4 Undercuts 3.
  • the material stocks 8 consist of in the pressing direction 19 protruding protrusions 9.
  • the protrusions 9 are in the pressing device 1 by a stamp 12th flattened, the material stock transverse to the pressing direction 19 deflected and in lateral recesses 16 a die 14 are displaced.
  • the shape of the recesses 16 correspond to the shoulders to be formed 5.
  • the Stamp 12 forms the surfaces of the shoulders 5.
  • Figure 4 shows the shape of the finished pressed part with the undercuts 3 and the molded shoulders 5.
  • the blank 2 no head start 9.
  • the material stocks are here in the Basic shape of the blank integrated and therefore not separate shown.
  • the stamp 12 has on the top two bump-like profiles 13, which during calibration leave a depression 20 in the finished pressed part 7. Due to the oblique flanks of the profiles 13 the material of the blank is calibrated in the relevant edge areas of the pin to the side in the Recesses 16 displaced. This results in the Figure 6 shown final form enclosed by the pressing tool of the press part 7.
  • the lower stamp 12 can also in the embodiment of Figure 3 in Press direction 19 have the above profile. Otherwise, the stamp 12 can have any surface design own other shaping options to take into account when calibrating.
  • the volumes of the recesses 16 essentially correspond the volumes of the material stocks 8 or the projections 9.
  • the volumes of material stocks are preferred 8 a little larger than the volume of them respectively assigned recesses 16, around which, 16, to ensure safe filling.
  • Figures 7 to 11 show the pressing device 1 in individual. It consists of the aforementioned lower stamp 12, a die 14 with a lateral receptacle or Guide 21, an upper punch 10 and a clamping ring 11.
  • the die 14 is in two or more Jaws 15 divided, which are essentially transverse to the pressing direction 19 are movable (Fig. 8, 8a). Like the figures 8 and 8a illustrate is between adjacent jaws 15 each clamped a spring 18, which the jaws 15 pushed apart. The die 14 can thereby open automatically.
  • the invention also extends to other opening mechanisms.
  • a clamping ring 11 is provided on the Holding plate 23 of the upper punch 10 elastic, e.g. about Springs, is attached and encloses this, 10, on all sides.
  • the jaws 15 are in turn in a side Recording 21 kept movable.
  • the clamping ring 11 has an internal conical clamping surface 17, which extended to the die 14.
  • the die 14 or its Jaws 15 in turn have a counter cone Coat 24.
  • the lower stamp 12 protrudes through the lower one, in the lateral one Recording 21 guided and movable in this Recording 26 and is guided centrally in the die 14.
  • the Recess 16 continues downward and serves with their lateral Limits as a guide surface for the lower stamp 12.
  • the Recess 16 the shape of a straight or curved groove or another suitable form such as a Have ring groove.
  • the press axis 19 can be arranged distributed around.
  • the Recesses 16 are located on the inside of the Die jaws 15.
  • the blank 2 is placed on the desired one Gauge blocks of the pressed part 7 brought and also in compressed substantially uniformly.
  • Figure 7 shows the starting position of the open Pressing device 1.
  • the blank 2 is opened Die 14 inserted.
  • the embodiment shown corresponds Figure 3.
  • a transverse slide should be installed, which on the Blank presses and presses the undercut.
  • the punches 10, 12 and the die 14 opposite the embodiment shown a different shape to have.
  • the Upper stamp 10 in a similar manner to the lower stamp 12 be formed, the die 14 also in the upper Area has lateral recesses 16.
  • the locking mechanisms for the die segments 15 be different.
  • eccentric or toggle lever systems can be used or hydraulic cylinders perform the locking function.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)

Claims (16)

  1. Procédé pour la fabrication d'une pièce frittée, pour laquelle une ébauche d'un seul tenant est formée et ensuite frittée dans une opération de presse à partir de poudre métallique, la pièce frittée terminée comportant au moins une contre-dépouille (3) qui est transversale par rapport à la direction de compression, caractérisé en ce qu'on forme la contre-dépouille par un épaulement saillant (5) et en ce que, par un calibrage donnant une pièce frittée terminée, on forme l'épaulement (5) par déformation au moyen d'un déplacement de matière sur l'ébauche frittée pendant une opération de presse supplémentaire.
  2. Procédé selon la revendication 1, caractérisé en ce qu'on forme par calibrage l'épaulement saillant (5), le fond (4) de la contre-dépouille (3) étant formé par la forme fondamentale de l'ébauche frittée (2).
  3. Procédé selon l'une des revendications 1 à 2, caractérisé en ce que, lors du calibrage, pour former l'épaulement saillant (5), une estampe (12) déplace la matière, destinée à cet effet, de l'ébauche frittée (2) transversalement par rapport à la direction de compression (19) dans un évidement (16) qui se trouve sur une paroi intérieure d'une matrice (14).
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'on fabrique une ébauche (2) avec une réserve de matière (8), le volume de la réserve de matière (8) correspondant globalement à l'évidement (16), et en ce qu'on met en oeuvre l'opération de calibrage sur la réserve de matière (8).
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce qu'on forme la réserve de matière (8) sur l'ébauche (2) par une partie en saillie (9) dépassant dans la direction de compression (19) et en ce que, lors du calibrage de l'ébauche frittée (2), on pousse cette partie en saillie (9) vers l'intérieur de cette ébauche frittée et latéralement dans l'évidement (16) à la suite de processus de déplacement.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que la réserve de matière (8) est fournie dans la forme fondamentale de l'ébauche (2) et en ce que, lors du calibrage, on la déplace latéralement dans l'évidement (16) grâce à un profil en saillie (13) existant sur l'estampe (12) en formant une dépression (20) sur le côté, proche de l'estampe (12), de l'ébauche (2).
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce qu'au moins une contre-dépouille (3) est imprimée par un coulisseau agissant transversalement par rapport à la direction de compression (19).
  8. Dispositif pour la fabrication selon le procédé correspondant aux revendications 1 à 7, de pièces frittées, qui comportent au moins un épaulement saillant (5) formant une contre-dépouille (3) située transversalement par rapport à la direction de compression, caractérisé par le fait qu'il comporte un dispositif de presse (1) comportant au moins une estampe mobile et une matrice, la matrice (14) comportant au moins deux mâchoires (15) qui sont mobiles globalement transversalement par rapport à la direction de compression (19) et parmi lesquelles au moins l'une comporte sur une surface de presse au moins un évidement (16).
  9. Dispositif de presse selon l'une des revendications 1 à 8, caractérisé en ce que l'estampe (12) formant la contre-dépouille (3) comporte un profil (13) saillant dans la direction de compression (19).
  10. Dispositif selon l'une des revendications 1 à 9, caractérisé en ce que le profil (13) a au moins le même volume que l'évidement (16) associé.
  11. Dispositif selon l'une des revendications 1 à 10, caractérisé en ce que le dispositif de presse (1) comporte un collier de serrage (11) qui, lors du calibrage, passe par-dessus la matrice (14), l'entoure solidement et presse les mâchoires (15) de la matrice (14) l'une contre l'autre en s'opposant à la pression interne existant dans la matrice (14).
  12. Dispositif selon l'une des revendications 1 à 11, caractérisé en ce que le collier de serrage (11) présente une surface de serrage (17) conique et la matrice (14) un cône opposé (24) sur son enveloppe.
  13. Dispositif selon l'une des revendications 1 à 12, caractérisé en ce que le collier de serrage (11) est agencé sur une estampe supérieure (10) mobile.
  14. Pièce métallique frittée comportant au moins une contre-dépouille (3) située transversalement par rapport à la direction de compression, laquelle pièce est fabriquée par le procédé selon les revendications 1 à 7, caractérisée en ce que la contre-dépouille (3) est formée par une déformation d'une ébauche pressée d'un seul tenant pour donner une pièce terminée lors d'une opération de presse supplémentaire mettant en oeuvre un calibrage.
  15. Pièce métallique frittée selon la revendication 14, caractérisée en ce que la contre-dépouille (3) comporte un fond (4) et un épaulement saillant (5), un contre-épaulement étant formé par une plaque de recouvrement (6).
  16. Pièce métallique frittée selon la revendication 14 ou 15, caractérisée en ce que la matière qui constitue la pièce frittée présente un allongement à la rupture supérieur à 2 %, de préférence supérieur à 10 %.
EP95105492A 1994-05-20 1995-04-12 Article moulé, procédé et installation pour sa préparation Expired - Lifetime EP0682999B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4417663A DE4417663C2 (de) 1994-05-20 1994-05-20 Preßteil aus Metallpulver, Verfahren und Vorrichtung zu seiner Herstellung
DE4417663 1994-05-20

Publications (3)

Publication Number Publication Date
EP0682999A2 EP0682999A2 (fr) 1995-11-22
EP0682999A3 EP0682999A3 (fr) 1997-05-07
EP0682999B1 true EP0682999B1 (fr) 2001-02-07

Family

ID=6518548

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95105492A Expired - Lifetime EP0682999B1 (fr) 1994-05-20 1995-04-12 Article moulé, procédé et installation pour sa préparation

Country Status (3)

Country Link
EP (1) EP0682999B1 (fr)
DE (2) DE4417663C2 (fr)
ES (1) ES2154691T3 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000096103A (ja) 1998-09-18 2000-04-04 Injex Corp 金属粉末射出成形品のアンダーカットの形成方法およびアンダーカットを備える金属粉末射出成形品
AT4665U1 (de) 2000-07-14 2001-10-25 Plansee Tizit Ag Verfahren zum pressen einer schneidplatte
FR2942733B1 (fr) * 2009-03-04 2015-12-25 Commissariat Energie Atomique Outillage de presse
JP5381647B2 (ja) * 2009-11-26 2014-01-08 トヨタ紡織株式会社 燃料電池用セパレータ及びその製造方法
CN103934455B (zh) * 2014-03-13 2016-06-08 北京科技大学 一种碱金属蒸发器用蒸发粉体的成型模具及成型方法
CN104384513B (zh) * 2014-12-09 2016-05-11 常熟市华德粉末冶金有限公司 粉末冶金侧孔成形模具
EP3388227A1 (fr) * 2017-04-13 2018-10-17 Seco Tools Ab Dispositif de compactage et procédé de production d'un corps vert d'insert de coupe par compactage d'une poudre
AT522877B1 (de) * 2019-10-04 2021-03-15 Miba Sinter Austria Gmbh Lagerbock
DE102019134153A1 (de) * 2019-12-12 2021-06-17 Gkn Sinter Metals Engineering Gmbh Sinterteil und Verfahren zu dessen Herstellung

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1609460A (en) * 1925-01-28 1926-12-07 Western Electric Co Apparatus for molding articles under high pressure
DE2219856B2 (de) * 1972-04-22 1974-07-18 Bayrisches Leichtmetallwerk Graf Bluecher Von Wahlstatt Kg, 8000 Muenchen Verfahren zum Herstellen von in einem Arbeitsgang geschmiedeten Sinterschmiedewerkstücken
DE2223163A1 (de) * 1972-05-12 1973-11-22 Krebsoege Gmbh Sintermetall Verfahren zum herstellen von metallischen speichennippeln fuer fahrzeuge und nach diesem verfahren hergestellter speichennippel
FR2201942A1 (en) * 1972-10-11 1974-05-03 Formflo Ltd Roller bearing rings mfr. - using rolled powder metal, process avoids need for cold hardening step and fracturing of formed blank
US4164063A (en) * 1978-02-23 1979-08-14 General Motors Corporation Process for making bearing locking collar
DE2854079A1 (de) * 1978-12-14 1980-07-03 Federal Mogul Corp Verfahren zum schmieden eines werkstueckes mit zurueckspringenden oberflaechenabschnitten
DE3004255A1 (de) * 1980-02-06 1981-08-13 Sintermetallwerk Krebsöge GmbH, 5608 Radevormwald Verfahren zur herstellung eines metallischen sinterformteils
DE3734002A1 (de) * 1987-10-08 1989-04-20 Ringsdorff Werke Gmbh Verfahren zum herstellen eines bauteils aus sintereisen oder sinterstahl

Also Published As

Publication number Publication date
DE59509008D1 (de) 2001-03-15
DE4417663A1 (de) 1995-11-23
EP0682999A3 (fr) 1997-05-07
EP0682999A2 (fr) 1995-11-22
DE4417663C2 (de) 2003-12-04
ES2154691T3 (es) 2001-04-16

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