EP0682999B1 - Pressteil aus Metallpulver, Verfahren und Vorrichtung zu seiner Herstellung - Google Patents
Pressteil aus Metallpulver, Verfahren und Vorrichtung zu seiner Herstellung Download PDFInfo
- 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
Links
Images
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.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
Description
- Figur 1 und 2 :
- das fertige Preß- oder Sinterteil mit Hinterschneidungen in Draufsicht und im Längsschnitt,
- Figur 3 und 4 :
- den Verformungsgang eines Rohlings beim Ankalibrieren der Hinterschneidung im Halbschnitt längs,
- Figur 5 und 6 :
- eine Variante zu Figur 3 und 4 und
- Figur 7 bis 11:
- die Preßvorrichtung in verschiedenen Arbeitsstellungen und Ansichten.
- 1
- Preßvorrichtung
- 2
- Rohling
- 3
- Hinterschneidung
- 4
- Boden
- 5
- Schulter
- 6
- Gegenschulter, Kopfplatte
- 7
- Preßteil, Sinterteil, Fertigteil
- 8
- Materialvorrat
- 9
- Vorsprung
- 10
- Stempel, Oberstempel
- 11
- Spannring
- 12
- Stempel, Unterstempel
- 13
- Profilierung
- 14
- Matrize
- 15
- Backe, Segment
- 16
- Ausnehmung
- 17
- Spannfläche
- 18
- Feder
- 19
- Preßrichtung
- 20
- Mulde
- 21
- seitliche Aufnahme, Führung für 11
- 22
- Schaft oder Zapfen
- 23
- Halteplatte für Oberstempel
- 24
- Außenmantel der Matrize (Gegenkonus)
- 25
- Federn zwischen 23 und 11
- 26
- untere Aufnahme in der Preßvorrichtung 1
Claims (16)
- Verfahren zur Herstellung eines Sinterteils, für das in einem Preßvorgang aus Metallpulver ein einstückiger Rohling geformt und anschließend gesintert wird, wobei das fertige Sinterteil mindestens eine quer zur Preßrichtung liegende Hinterschneidung (3) aufweist, dadurch gekennzeichnet, daß die Hinterschneidung durch eine vorstehende Schulter (5) gebildet wird, und die Schulter (5) durch Umformen mittels Materialverschiebung an dem gesinterten Rohling zum fertigem Sinterteil durch Kalibrieren während eines zusätzlichen Preßvorganges angeformt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die vorstehende Schulter (5) durch Kalibrieren angeformt wird, wobei der Boden (4) der Hinterschneidung (3) durch die Grundform des gesinterten Rohlings (2) gebildet wird.
- Verfahren nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, daß beim Kalibrieren ein Stempel (12) das dazu bestimmte Material des gesinterten Rohlings (2) zur Bildung der vorstehenden Schulter (5) quer zur Preßrichtung (19) in einer Ausnehmung (16) verdrängt, die sich an einer Innenwand einer Matrize (14) befindet.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß ein Rohling (2) mit einem Materialvorrat (8) hergestellt wird, wobei das Volumen des Materialvorrats (8) im wesentlichen der Ausnehmung (16) entspricht und daß an dem Materialvorrat (8) der Kalibriervorgang ausgeführt wird.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Materialvorrat (8) von einem in Preßrichtung (19) abstehenden Vorsprung (9) am Rohling (2) gebildet wird, und dieser Vorsprung (9) beim Kalibrieren des gesinterten Rohlings (2) in diesen hinein und infolge von Verlagerungsvorgängen seitlich in die Ausnehmung (16) gepreßt wird.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Materialvorrat (8) in der Grundform des Rohlings (2) vorhanden ist und beim Kalibrieren durch eine vorstehende Profilierung (13) am Stempel (12) unter Bildung einer Mulde (20) auf der dem Stempel (12) zugekehrten Seite des Rohlings (2) seitlich in die Ausnehmung (16) hineinverdrängt wird.
- Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß wenigstens eine Hinterschneidung (3) durch einen quer zur Preßrichtung (19) wirkenden Schieber eingepreßt wird.
- Vorrichtung zur Herstellung von Sinterteilen mit wenigstens einer vorstehenden Schulter (5), die eine quer zur Preßrichtung liegende Hinterschneidung (3) bildet, nach dem Verfahren entsprechend den Ansprüchen 1 bis 7, gekennzeichnet durch eine Preßvorrichtung (1), mit mindestens einem beweglichen Stempel und einer Matrize, wobei die Matrize (14) wenigstens zwei im wesentlichen quer zur Preßrichtung (19) bewegliche Backen (15) aufweist, von denen mindestens eine an einer Preßfläche wenigstens eine Ausnehmung (16) aufweist.
- Vorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der die Hinterschneidung (3) bildende Stempel (12) eine in Preßrichtung (19) vorstehende Profilierung (13) aufweist.
- Vorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Profilierung (13) mindestens das gleiche Volumen wie die zugehörige Ausnehmung (16) aufweist.
- Vorrichtung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die Preßvorrichtung (1) einen Spannring (11) aufweist, der beim Kalibrieren über die Matrize (14) greift, sie fest umschließt und die Backen (15) der Matrize (14) gegen den in der Matrize (14) herrschenden Innendruck aneinanderpreßt.
- Vorrichtung nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß der Spannring (11) eine konische Spannfläche (17) und die Matrize (14) einen Gegenkonus (24) am Mantel aufweist.
- Vorrichtung nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, daß der Spannring (11) an einem beweglichen Oberstempel (10) angeordnet ist.
- Metallisches Sinterteil mit mindestens einer quer zur Preßrichtung liegenden Hinterschneidung (3) hergestellt nach dem Verfahren entsprechend den Verfahrensansprüchen 1 bis 7, dadurch gekennzeichnet, daß die Hinterschneidung (3) durch Umformen eines einstückigen gepreßten Rohlings zum Fertigteil durch einen zusätzlichen kalibrierenden Preßvorgang angeformt ist.
- Metallisches Sinterteil nach Anspruch 14, dadurch gekennzeichnet, daß die Hinterschneidung (3), einen Boden (4) und eine vorstehende Schulter (5) aufweist, wobei eine Gegenschulter durch eine Kopfplatte (6) gebildet wird.
- Metallisches Sinterteil nach Anspruch 14 oder 15, dadurch gekennzeichnet, daß das Material, aus dem das Sinterteil besteht, eine Bruchdehnung größer als 2%, vorzugsweise größer als 10%, aufweist.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4417663 | 1994-05-20 | ||
| DE4417663A DE4417663C2 (de) | 1994-05-20 | 1994-05-20 | Preßteil aus Metallpulver, Verfahren und Vorrichtung zu seiner Herstellung |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0682999A2 EP0682999A2 (de) | 1995-11-22 |
| EP0682999A3 EP0682999A3 (de) | 1997-05-07 |
| EP0682999B1 true EP0682999B1 (de) | 2001-02-07 |
Family
ID=6518548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95105492A Expired - Lifetime EP0682999B1 (de) | 1994-05-20 | 1995-04-12 | Pressteil aus Metallpulver, Verfahren und Vorrichtung zu seiner Herstellung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0682999B1 (de) |
| DE (2) | DE4417663C2 (de) |
| ES (1) | ES2154691T3 (de) |
Families Citing this family (9)
| 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 (de) * | 2017-04-13 | 2018-10-17 | Seco Tools Ab | Verdichtervorrichtung und verfahren zur herstellung eines schneideinsatzgrünlings durch verdichten von pulver |
| 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)
| 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 |
-
1994
- 1994-05-20 DE DE4417663A patent/DE4417663C2/de not_active Expired - Lifetime
-
1995
- 1995-04-12 ES ES95105492T patent/ES2154691T3/es not_active Expired - Lifetime
- 1995-04-12 EP EP95105492A patent/EP0682999B1/de not_active Expired - Lifetime
- 1995-04-12 DE DE59509008T patent/DE59509008D1/de not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| ES2154691T3 (es) | 2001-04-16 |
| DE4417663A1 (de) | 1995-11-23 |
| EP0682999A3 (de) | 1997-05-07 |
| DE4417663C2 (de) | 2003-12-04 |
| DE59509008D1 (de) | 2001-03-15 |
| EP0682999A2 (de) | 1995-11-22 |
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