EP0682999A2 - 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
EP0682999A2
EP0682999A2 EP95105492A EP95105492A EP0682999A2 EP 0682999 A2 EP0682999 A2 EP 0682999A2 EP 95105492 A EP95105492 A EP 95105492A EP 95105492 A EP95105492 A EP 95105492A EP 0682999 A2 EP0682999 A2 EP 0682999A2
Authority
EP
European Patent Office
Prior art keywords
blank
die
undercut
pressed
pressing
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
EP95105492A
Other languages
German (de)
English (en)
Other versions
EP0682999B1 (fr
EP0682999A3 (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
Ringsdorff Sinter 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 Ringsdorff Sinter GmbH filed Critical Ringsdorff Sinter 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 pressed part made of metal powder, in particular a sintered part with at least one undercut lying transversely to the pressing direction, together with a method and device for its production with the features in the preamble of the independent claims.
  • a sintered metal body which has undercuts lying transverse to the pressing direction.
  • the sintered metal body is constructed in several parts.
  • the individual shaped parts are put together to form a component and then bonded to one another by applying a magnetite layer to their surfaces. Due to the multi-part nature of the sintered metal body, this procedure requires a certain amount of construction and process effort.
  • the undercuts can also be subsequently machined into the sintered metal body.
  • the possibility of combining the individual parts of a multi-part sintered metal body by welding or soldering is also addressed. These techniques also mean an increased construction and process effort, which is reflected in the cost and in the economy of the pressed part to be produced.
  • the pressed or sintered part according to the invention which is produced by powder metallurgy, is characterized by undercuts formed in one piece, i.e. the undercuts are formed on a pre-pressed one-piece blank during a pressing process, preferably during calibration.
  • the blank is already in the sintered state.
  • the aforementioned procedure eliminates the need to assemble previously separately pressed individual parts and / or costly post-processing.
  • the one-piece design of the blank eliminates tolerance problems, e.g. caused by adding existing over- or undersizes to parts to be joined.
  • the method according to the invention can be carried out more quickly, simply and cost-effectively.
  • the undercuts are formed on the blank during calibration by material displacement.
  • the blank can be compacted. For example, also press a punch or slide across the blank and press in the undercut.
  • the base of the undercuts is formed by the basic shape of the blank present and, during calibration, only one protruding shoulder is molded on for each undercut. This is preferably done by shifting a material supply in the blank, which forms a protruding shoulder for the differentiation.
  • the material is shifted preferably by means of a movable punch which displaces the material present at a corresponding point in the blank transversely to the pressing direction into a lateral recess located on a die and thereby forms the aforementioned shoulder.
  • the volume of material is at least the same volume as the recess and both, the material supply and the recess are arranged adjacent.
  • the volume of material is preferably somewhat larger in volume than the recess.
  • the material supply is in the form of an elevation on the surface of the blank in the vicinity of the recess in the die which later forms the shoulder.
  • the material supply is in the blank and is pushed into the blank during pressing or calibration by penetration of an attachment located on the press ram.
  • the volume of the attachment is at least as large as that of the recess that later forms the shoulder.
  • the method according to the invention can be carried out in a conventional pressing device.
  • a die adapted to the molding task must be used. This has two or more movable jaws or segments, of which at least one / one has a recess on the pressing surface which corresponds in shape and volume to the shoulder which later projects beyond the undercut.
  • the mold can be opened to remove the finished and calibrated pressed part, which also releases the undercut.
  • a pre-product body is produced by powder metallurgy, in which there is a material reservoir on a surface that is adjacent to the later undercut and that is transverse to the pressing direction during calibration, the volume of which corresponds at least to the volume that in the finished sintered body exceeds the undercut and occupies a limiting shoulder.
  • the pre-product body is then inserted into a die which consists of at least two movable segments and which is in the open state when the segments are moved apart.
  • This die has at least one recess on its inner wall which is equivalent to the intended shape of the at least one shoulder which projects beyond and delimits the undercut in the finished sintered metal part.
  • the pre-product body is inserted into the die in such a way that its area carrying the material reservoir is located at the point at which the corresponding recess in the inner wall of the die for the formation of the shoulder projecting beyond the undercut.
  • the die is then brought into the pressing position with the pre-product body in a die press having at least one press die, the die is closed to a calibration dimension by pressing the segments together, for example by means of a hydraulically or mechanically acting closing device, and the pre-product body is calibrated with a press die using such a pressure that this on it or in the material reservoir located in it is rearranged by flow processes into the recess located in the die wall, thus creating the bulge which is superior and delimiting the undercut.
  • This pressing process removes the press ram from the die, which relieves or removes the closing device spanning the die segments, the die segments are moved outwards in the open position and the finished press part is removed.
  • the pressed part or the blank can consist of any suitable metal powder. It has proven to be advantageous if the blank material has an elongation at break of more than 2%, preferably more than 10%. Suitable materials are e.g. SINT D35 (phosphorus-containing steels), SINT D40 (stainless steel) etc.
  • Figures 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 also have any other suitable metallic composition.
  • the finished pressed or sintered part consists of a metal which has an elongation at break of more than 2%, preferably 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 undercut 3 lying transversely to the pressing direction. In the exemplary embodiment shown there are two undercuts 3 lying opposite one another in the form of transverse grooves or troughs.
  • Figure 2 illustrates the training in longitudinal section.
  • the undercut 3 has a base 4 and a projecting shoulder 5.
  • the counter shoulder is formed here by a widened head plate 6.
  • the pressing part 7 can be designed in any other way. There can also be only one undercut 3 or even three or more undercuts 3 or an annular groove have, which can also be distributed as desired on the pressing part 7.
  • the finished part 7 receives the undercuts 3 when calibrating a pre-pressed, in the case of a sintered part a pre-pressed and sintered blank 2 consisting of only one part by molding. As shown in FIGS. 3 to 6, the shoulders 5 are formed by shifting the material. The calibration process takes place in a press device 1, which is described and illustrated in more detail below with reference to FIGS. 7 to 11.
  • the blank 2 has a simple shape which can be easily produced by pressing powders optionally provided with a binder and preferably subsequent sintering. In the exemplary embodiment shown, it already has the top plate 6 and a smooth shank or pin 22 which has the approximately barrel-shaped cross section shown in FIG. The blank 2 does not yet have a finished undercut 3 transverse to its pressing direction. The side walls of the shaft or pin 22, however, already form the later bases 4 of the undercuts 3 shown in FIG. 4.
  • the blank 2 has material stocks 8 which are shifted during calibration and which thereby form the new shoulders 5.
  • the material stocks 8 consist of projections 9 protruding in the pressing direction 19.
  • the projections 9 are pressed flat in the pressing device 1 by a punch 12, the material stocks being deflected transversely to the pressing direction 19 and displaced into lateral recesses 16 on a die 14.
  • the shape of the recesses 16 correspond to the shoulders 5 to be formed.
  • the stamp 12 forms the surfaces of the shoulders 5.
  • FIG. 4 shows the shape of the finished pressed part with the undercuts 3 and the molded shoulders 5.
  • the blank 2 has no protrusion 9.
  • the material stocks are integrated into the basic shape of the blank and are therefore not shown separately.
  • the punch 12 has two bump-like profiles 13 on the upper side, which leave a depression 20 in the finished pressed part 7 during calibration. Due to the oblique flanks of the profiles 13, the material of the blank is displaced to the side into the recesses 16 during calibration in the relevant edge regions of the journal. This results in the final shape of the press part 7 shown in FIG. 6 which is enclosed by the press tool.
  • the lower punch 12 can also have a profile protruding in the pressing direction 19. Otherwise, the stamp 12 can have any surface design in order to take account of other shaping options when calibrating.
  • the volumes of the recesses 16 essentially correspond to the volumes of the material stores 8 or the projections 9.
  • the volumes of the material stores 8 are preferably a little larger than the volumes of the recesses 16 assigned to them in order to ensure that they are filled securely.
  • Figures 7 to 11 show the pressing device 1 in detail. It consists of the aforementioned lower punch 12, a die 14 with a lateral receptacle or guide 21, an upper punch 10 and a clamping ring 11.
  • the die 14 is divided into two or more jaws 15, which are essentially movable transversely to the pressing direction 19 (FIGS. 8, 8a). As FIGS. 8 and 8a illustrate, a spring 18 is clamped between adjacent jaws 15 and forces the jaws 15 apart. The die 14 can thereby open automatically.
  • the invention extends to other opening mechanisms.
  • a clamping ring 11 is provided, which is elastic on the holding plate 23 of the upper punch 10, e.g. is attached via springs and encloses this, 10, on all sides.
  • the jaws 15 are in turn held movably in a lateral receptacle 21.
  • the clamping ring 11 has an internal conical clamping surface 17 which widens towards the die 14.
  • the die 14 or its jaws 15 in turn have a jacket 24 designed as a counter-cone.
  • the lower punch 12 protrudes through the lower, guided in the lateral receptacle 21 and movable in this receptacle 26 and is guided centrally in the die 14.
  • the recess 16 continues downward and, with its lateral boundaries, serves as a guide surface for the lower punch 12.
  • the recess 16 can have the shape of a straight or curved groove or some other suitable shape such as an annular groove.
  • a plurality of recesses 16 can also be arranged distributed around the press axis 19. The recesses 16 are located on the inside of the die jaws 15.
  • the blank 2 When calibrating, the blank 2 is brought to the desired final dimensions of the pressed part 7 and is also compacted substantially uniformly.
  • FIG. 7 shows the starting position of the opened pressing device 1.
  • the blank 2 is placed in the opened die 14.
  • the embodiment shown corresponds to FIG. 3.
  • the stamp 10 is raised again with the clamping ring 11 in order to demold.
  • the jaws 15 of the die 14 automatically open due to the pressure of the springs 18 (FIGS. 8, 8a) and release the compact 7.
  • the compact can be ejected by lifting the lower punch 12. It can also be removed from the die 14 in other ways.
  • a guerlaufischer slide should be installed, which presses on the blank and presses in the undercut.
  • the punches 10, 12 and the die 14 can have a different shape from the exemplary embodiment shown.
  • both the shoulder and the back shoulder of an undercut can be molded during calibration.
  • the upper punch 10 can be designed in a similar manner to the lower punch 12, the die 14 also having lateral recesses 16 in the upper region.
  • the closing mechanisms for the die segments 15 can be different.
  • eccentric or toggle lever systems can be used or hydraulic cylinders can perform the locking function.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
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 true EP0682999A2 (fr) 1995-11-22
EP0682999A3 EP0682999A3 (fr) 1997-05-07
EP0682999B1 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)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1033193A4 (fr) * 1998-09-18 2001-10-24 Injex Corp Procede de formation d'un evidement dans un article moule par injection de poudre metallique et article ainsi forme
US6536305B2 (en) 2000-07-14 2003-03-25 Plansee Tizit Aktiengesellschaft Cutting plate and method of pressing a cutting plate
FR2942733A1 (fr) * 2009-03-04 2010-09-10 Commissariat Energie Atomique Outillage de presse
CN103934455A (zh) * 2014-03-13 2014-07-23 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
CN104384513A (zh) * 2014-12-09 2015-03-04 常熟市华德粉末冶金有限公司 粉末冶金侧孔成形模具
DE102010061802B4 (de) * 2009-11-26 2015-10-22 Toyota Boshoku Kabushiki Kaisha Verfahren zur Herstellung eines Separators für eine Brennstoffzelle
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
AT522877A4 (de) * 2019-10-04 2021-03-15 Miba Sinter Austria Gmbh Lagerbock

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019134153A1 (de) * 2019-12-12 2021-06-17 Gkn Sinter Metals Engineering Gmbh Sinterteil und Verfahren zu dessen Herstellung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3734002A1 (de) 1987-10-08 1989-04-20 Ringsdorff Werke Gmbh Verfahren zum herstellen eines bauteils aus sintereisen oder sinterstahl

Family Cites Families (7)

* 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

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3734002A1 (de) 1987-10-08 1989-04-20 Ringsdorff Werke Gmbh Verfahren zum herstellen eines bauteils aus sintereisen oder sinterstahl

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1033193A4 (fr) * 1998-09-18 2001-10-24 Injex Corp Procede de formation d'un evidement dans un article moule par injection de poudre metallique et article ainsi forme
US6444167B1 (en) 1998-09-18 2002-09-03 Injex Corporation Method of forming undercut in metal powder injection-molded article
US6536305B2 (en) 2000-07-14 2003-03-25 Plansee Tizit Aktiengesellschaft Cutting plate and method of pressing a cutting plate
FR2942733A1 (fr) * 2009-03-04 2010-09-10 Commissariat Energie Atomique Outillage de presse
DE102010061802B4 (de) * 2009-11-26 2015-10-22 Toyota Boshoku Kabushiki Kaisha Verfahren zur Herstellung eines Separators für eine Brennstoffzelle
CN103934455A (zh) * 2014-03-13 2014-07-23 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
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
CN104384513A (zh) * 2014-12-09 2015-03-04 常熟市华德粉末冶金有限公司 粉末冶金侧孔成形模具
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
WO2018189315A1 (fr) * 2017-04-13 2018-10-18 Seco Tools Ab Dispositif de compactage et procédé de fabrication d'une ébauche crue d'insert de coupe par compactage d'une poudre
AT522877A4 (de) * 2019-10-04 2021-03-15 Miba Sinter Austria Gmbh Lagerbock
AT522877B1 (de) * 2019-10-04 2021-03-15 Miba Sinter Austria Gmbh Lagerbock

Also Published As

Publication number Publication date
DE59509008D1 (de) 2001-03-15
EP0682999B1 (fr) 2001-02-07
DE4417663C2 (de) 2003-12-04
DE4417663A1 (de) 1995-11-23
ES2154691T3 (es) 2001-04-16
EP0682999A3 (fr) 1997-05-07

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