EP0185951B1 - Consolidating tool for compressing metal powders - Google Patents

Consolidating tool for compressing metal powders Download PDF

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Publication number
EP0185951B1
EP0185951B1 EP85115038A EP85115038A EP0185951B1 EP 0185951 B1 EP0185951 B1 EP 0185951B1 EP 85115038 A EP85115038 A EP 85115038A EP 85115038 A EP85115038 A EP 85115038A EP 0185951 B1 EP0185951 B1 EP 0185951B1
Authority
EP
European Patent Office
Prior art keywords
mould
outer ring
die
tool
consolidating
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
EP85115038A
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German (de)
French (fr)
Other versions
EP0185951A1 (en
Inventor
Ignaz Dipl.-Ing. Mathy
Heinrich Koop
Günther Dr.-Ing. Scharf
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.)
Vereinigte Aluminium Werke AG
Original Assignee
Vereinigte Aluminium Werke AG
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 Vereinigte Aluminium Werke AG filed Critical Vereinigte Aluminium Werke AG
Priority to AT85115038T priority Critical patent/ATE50181T1/en
Publication of EP0185951A1 publication Critical patent/EP0185951A1/en
Application granted granted Critical
Publication of EP0185951B1 publication Critical patent/EP0185951B1/en
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    • 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
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor

Definitions

  • the invention relates to a consolidation tool for compacting metal powders, consisting of a die, lower and upper punches and lateral guides and a press table.
  • Such tools are known from DE-PS-2 224 592.
  • a double-acting press force is applied with a single-sided press.
  • the die is suspended from a movable intermediate crossbar, the die being moved over the lower punch for molding and the powder bar being expelled in the process.
  • the object of the invention is to develop a consolidation tool of the type mentioned at the outset which enables the compacting of metal powders, in particular in the form of slim powder bars with a diameter to height ratio of 0.0125 to 0.21, without cracking in a simple manner.
  • segment matrices were known from DE-OS-2 501 613, these are so technically complex that they are difficult to operate and handle in practice.
  • the floating arrangement of the consolidation tool according to the invention by means of spring force, hydraulic and / or pneumatic cylinders ensures that the initial position of the die is securely positioned. Furthermore, it is possible to control the die speed during the upsetting process in relation to the movable punch in such a way that, in the case of particularly slim powder bars, the die travels at a predetermined speed when the upper punch drops.
  • the preferred pressing forces are between 200 and 800 N / mm 2.
  • the angle of the cone wall to the axial is between 0.3 and 10 °. Within these limits, the angle can be selected as a function of the pressing forces so that hardly any securing forces against the die emerging from the outer ring are necessary during the pressing process.
  • the wedge shape influences the pressing force for releasing the die from the inner ring after the consolidation process.
  • Fig. 1 the die is labeled 1, the spring, hydraulic and / or pneumatic cylinder 2, 3 and the press table 4. Upper and lower punches 5, 6 protrude into the die, between which the powder mixture 7 is arranged.
  • the pressing force is symbolically represented by arrow 8.
  • the die 1 is provided with an outer cone and held in an outer ring 9 which has a correspondingly designed inner cone.
  • the outer ring 9 is guided on the stands 12, 13 by means of crossbeams 10, 11.
  • Terminal strips 14 can be arranged between the outer cone and the inner cone, which serve to secure the position of the individual parts of the consolidation tool.
  • a four-part die is shown, consisting of the individual segments 21-24.
  • Fig. 3 shows an asymmetrically divided die with the segments 31-34. This arrangement has the advantage that it is easier to manufacture in terms of manufacturing technology and therefore in mass production is preferably used.
  • a cylinder 90 mm in diameter and 250 mm in height was produced with the powder made of AICuMg2, a pressing force of 650 N / mm 2 being applied for 2 minutes.
  • a powder blank with a diameter of 80 mm and a height of 200 mm was produced from the AIZnMgCu1.5 alloy, with 800 N / mm 2 acting on the powder for 10 min.
  • Pressure rings were used to press out the die, which enable the die and outer ring to be moved separately by means of an upper punch.

Abstract

1. A consolidating tool for compacting metal powder, comprising a mould (1) having an outer cone (16), upper and lower dies (5, 6) and lateral guides (10 to 13) and a press bed (4), wherein the mould (1) is divided into at least three segments and is supported relative to the press bed (5) by way of springs, hydraulic and/or pneumatic cylinders (2, 3), the mould (1) being held in an outer ring (9) provided with an inner cone (15), and means being provided for pressing out the mould (1) after each pressing operation.

Description

Die Erfindung betrifft ein Konsolidierungswerkzeug zum Kompaktieren von Metallpulvern, bestehend aus Matrize, Unter- und Oberstempel sowie seitlichen Führungen und einem Pressentisch.The invention relates to a consolidation tool for compacting metal powders, consisting of a die, lower and upper punches and lateral guides and a press table.

Derartige Werkzeuge sind aus der DE-PS-2 224 592 bekannt. Dabei wird mit einer einseitig wirkenden Presse eine beidseitig wirkende Preßkraft aufgebracht. Über eine bewegliche Zwischentraverse ist die Matrize schwebend gelagert, wobei zum Ausformen die Matrize über den unteren Stempel gefahren wird und dabei der Pulverbarren ausgestoßen wird.Such tools are known from DE-PS-2 224 592. A double-acting press force is applied with a single-sided press. The die is suspended from a movable intermediate crossbar, the die being moved over the lower punch for molding and the powder bar being expelled in the process.

Bei der Herstellung von schlanken Pulverbarren, bei denen die Höhe der hergestellten Grünlinge wesentlich größer ist als ihre Breite bzw. Durchmesser, kommt es häufig zu Anklebungen bzw. Rissen an der Außenhaut des kompaktierten Barrens. Nach US 2 253 003 wird die Matrize mit einem Außenkonus in den Außenring eingesetzt und bleibt auch nach dem Preßvorgang in der ummantelten Stellung. Der Preßling wird dann mit Kolben aus der Matrize ausgeworfen, wobei es insbesondere bei schlanken Barren und bei Pulverlegierungen auf Aluminiumbasis zu Rißbildungen im Preßling kommen kann.In the production of slim powder bars, in which the height of the green bodies produced is substantially greater than their width or diameter, sticking or cracks often occur on the outer skin of the compacted bar. According to US 2 253 003, the die is inserted into the outer ring with an outer cone and remains in the covered position even after the pressing process. The compact is then ejected from the die with pistons, which can lead to cracking in the compact, particularly in the case of slim bars and aluminum-based powder alloys.

Aufgabe der Erfindung ist es, ein Konsolidierungswerkzeug der eingangs genannten Art zu entwickeln, das die Kompaktierung von Metallpulvern insbesondere in Form schlanker Pulverbarren mit einem Durchmesser zu Höhenverhältnis von 0,0125 bis 0,21 ohne Rißbildung in einfacher Weise ermöglicht.The object of the invention is to develop a consolidation tool of the type mentioned at the outset which enables the compacting of metal powders, in particular in the form of slim powder bars with a diameter to height ratio of 0.0125 to 0.21, without cracking in a simple manner.

Die Aufgabe wird erfindungsgemäß durch die in den Patentansprüchen angegebenen Merkmale gelöst. Zwar war die Verwendung von Segmentmatrizen aus der DE-OS-2 501 613 bekannt, jedoch sind diese technisch so aufwendig konstruiert, daß die Bedienung und Handhabung in der Praxis auf Schwierigkeiten stößt.The object is achieved according to the invention by the features specified in the patent claims. Although the use of segment matrices was known from DE-OS-2 501 613, these are so technically complex that they are difficult to operate and handle in practice.

Durch die schwebende Anordnung des erfindungsgemäßen Konsolidierungswerkzeuges mittels Federkraft, hydraulischer und/oder pneumatischer Zylinder kann eine sichere Positionierung der Anfangsstellung der Matrize gewährleistet werden. Ferner ist es möglich die Matrizengeschwindigkeit während des Stauchvorganges gegenüber dem beweglichen Stempel zu steuern derart, daß bei besonders schlanken Pulverbarren die Matrize mit vorgegebener Geschwindigkeit beim Niedergehen des oberen Stempels mitfährt.The floating arrangement of the consolidation tool according to the invention by means of spring force, hydraulic and / or pneumatic cylinders ensures that the initial position of the die is securely positioned. Furthermore, it is possible to control the die speed during the upsetting process in relation to the movable punch in such a way that, in the case of particularly slim powder bars, the die travels at a predetermined speed when the upper punch drops.

Die bevorzugten Preßkräfte liegen zwischen 200 und 800 N/mm2 Bei einer Körnung des Metallpulvers < 160 µm liegt der Winkel der Konuswand zur Axialen zwischen 0,3 bis 10°. Innerhalb dieser Grenzen kann der Winkel in Abhängigkeit von den Preßkräften so gewählt werden, daß kaum Sicherungskräfte gegen das Austreten der Matrize aus dem Außenring während des Preßvorganges notwendig sind. Ferner wird durch die Keilform die Preßkraft zum Lösen der Matrize aus dem Innenring nach dem Konsolidierungsvorgang beeinflußt.The preferred pressing forces are between 200 and 800 N / mm 2. With a grain size of the metal powder <160 µm, the angle of the cone wall to the axial is between 0.3 and 10 °. Within these limits, the angle can be selected as a function of the pressing forces so that hardly any securing forces against the die emerging from the outer ring are necessary during the pressing process. Furthermore, the wedge shape influences the pressing force for releasing the die from the inner ring after the consolidation process.

Im folgenden wird die Erfindung anhand mehrerer Ausführungsbeispiele näher erläutert.The invention is explained in more detail below with the aid of several exemplary embodiments.

Es zeigen:

  • Abb. 1 Querschnitt durch das erfindungsgemäße Konsolidierungswerkzeug;
  • Abb. 2 Aufsicht auf einesymmetrisch geteilte Matrize;
  • Abb. 3 Aufsicht auf eine asymmetrisch geteilte Matrize.
Show it:
  • Fig. 1 cross section through the consolidation tool according to the invention;
  • Fig. 2 top view of a symmetrically split die;
  • Fig. 3 Top view of an asymmetrically split die.

In Abb. 1 ist die Matrize mit 1, die Feder, Hydraulik- und/oder Pneumatikzylinder mit 2, 3 und der Pressentisch mit 4 bezeichnet. In die Matrize ragen Ober- und Unterstempel 5, 6 hinein, zwischen denen die Pulvermischung 7 angeordnet ist. Die Preßkraft ist symbolisch mit Pfeil 8 dargestellt.In Fig. 1 the die is labeled 1, the spring, hydraulic and / or pneumatic cylinder 2, 3 and the press table 4. Upper and lower punches 5, 6 protrude into the die, between which the powder mixture 7 is arranged. The pressing force is symbolically represented by arrow 8.

Nach dem bevorzugten Ausführungsbeispiel ist die Matrize 1 mit einem Außenkonus versehen und in einem Außenring 9 gehalten, der einen entsprechend ausgebildeten Innenkonus aufweist. Über Traversen 10, 11 wird der Außenring 9 an den Ständern 12, 13 geführt. Zwischen Außenkonus und Innenkonus können Klemmleisten 14 angeordnet sein, die zur Sicherung der Lage der Einzelteile des Konsolidierungswerkzeuges dienen.According to the preferred embodiment, the die 1 is provided with an outer cone and held in an outer ring 9 which has a correspondingly designed inner cone. The outer ring 9 is guided on the stands 12, 13 by means of crossbeams 10, 11. Terminal strips 14 can be arranged between the outer cone and the inner cone, which serve to secure the position of the individual parts of the consolidation tool.

In Abb. 2 ist eine viergeteilte Matrize dargestellt, bestehend aus den Einzelsegmenten 21 - 24. Abb. 3 zeigt eine asymmetrisch geteilte Matrize mit den Segmenten 31 - 34. Diese Anordnung hat den Vorteil, daß sie fertigungstechnisch leichter herstellbar ist und daher in der Massenfabrikation bevorzugt verwendet wird.In Fig. 2, a four-part die is shown, consisting of the individual segments 21-24. Fig. 3 shows an asymmetrically divided die with the segments 31-34. This arrangement has the advantage that it is easier to manufacture in terms of manufacturing technology and therefore in mass production is preferably used.

Im folgenden wird eine Verfahrensbeschreibung für das erfindungsgemäße Konsolidierungswerkzeug gegeben. Als Pulver werden Legierungen von AICuMg2 und AIZnMgCu1,5 verwendet. Im ersten Falle lag die Körnung unterhalb von 160 pm, im zweiten Falle waren die Pulverteilchen alle < 45 pm.A description of the method for the consolidation tool according to the invention is given below. Alloys of AICuMg2 and AIZnMgCu1.5 are used as powder. In the first case the grain size was below 160 pm, in the second case the powder particles were all <45 pm.

Mit dem Pulver aus AICuMg2 wurde ein Zylinder von 90 mm Durchmesser und 250 mm Höhe hergestellt, wobei eine Preßkraft von 650 N/mm2 für 2 min.aufgebracht wurde.A cylinder 90 mm in diameter and 250 mm in height was produced with the powder made of AICuMg2, a pressing force of 650 N / mm 2 being applied for 2 minutes.

Aus der AIZnMgCu1,5 Legierung wurde ein Pulverrohling mit dem Durchmesser von 80 mm und einer Höhe von 200 mm hergestellt, wobei 800 N/mm2 für 10 min auf das Pulver einwirkten.A powder blank with a diameter of 80 mm and a height of 200 mm was produced from the AIZnMgCu1.5 alloy, with 800 N / mm 2 acting on the powder for 10 min.

Zum Auspressen der Matrize wurden Druckringe verwendet, die eine getrennte Verschiebung von Matrize und Außenring mittels Oberstempel ermöglichen.Pressure rings were used to press out the die, which enable the die and outer ring to be moved separately by means of an upper punch.

Beide Pulverrohlinge ließen sich leicht aus der Matrize entfernen, ohne daß Risse oder Abbröckelungen auftraten. Der Arbeitstakt verlief im einzelnen wie folgt:Both powder blanks were easily removed from the die without cracking or crumbling. The work cycle was as follows:

ArbeitstaktWork cycle

Ausgangsstellung: Füllbereites Werkzeug

  • 1. Pulver einfüllen
  • 2. Oberstempel zurückstellen - bis zum Anschlag
  • 3. Pressen
  • 4. Stempel hochfahren
  • 5. Oberstempel vorziehen - bis zum Anschlag
  • 6. Druckplatte auflegen
  • 7. Druckringe unterlegen
  • 8. Auspressen der geteilten Matrize
  • 9. Stempel hochfahren
  • 10. Druckplatte und Druckringe entfernen
  • 11. Geteilte Form mit Pressling entnehmen
  • 12. Pressling entnehmen
Starting position: tool ready for filling
  • 1. Pour in the powder
  • 2. Reset the upper stamp - until it stops
  • 3. Pressing
  • 4. Raise the stamp
  • 5. Pull the upper punch forward until it stops
  • 6. Put on the pressure plate
  • 7. Place pressure rings underneath
  • 8. Squeeze out the split die
  • 9. Raise the stamp
  • 10. Remove the pressure plate and pressure rings
  • 11. Remove the split form with the compact
  • 12. Remove the compact

Claims (4)

1. A consolidating tool for compacting metal powder, comprising a mould (1) having an outer cone (16), upper and lower dies (5, 6) and lateral guides (10 to 13) and a press bed (4), wherein the mould (1) is divided into at least three segments and is supported relative to the press bed (5) by way of springs, hydraulic and/or pneumatic cylinders (2, 3), the mould (1) being held in an outer ring (9) provided with an inner cone (15), and means being provided for pressing out the mould (1) after each pressing operation.
2. A consolidating tool as claimed in claim 1, characterized in that the outer ring is guided on at least two vertical bars (12, 13) and is supported relative to the press bed (4) by way of springs, hydraulic and/or pneumatic cylinders (2, 3), wherein the spring force or damping corresponds to the dead weight of the mould (1) and outer ring (9).
3. A consolidating tool as claimed in any of the preceding claims, characterized in that the outer ring (9) has an inner cone (14) having a wall inclined between 0,3 to 10° relative to the axial axis.
4. A consolidating tool as claimed in any of the preceding claims, characterized in that the mould (1) has an outer cone (16) and is secured in the outer ring (9) by clamping strips (14).
EP85115038A 1984-12-22 1985-11-27 Consolidating tool for compressing metal powders Expired - Lifetime EP0185951B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85115038T ATE50181T1 (en) 1984-12-22 1985-11-27 CONSOLIDATION TOOL FOR COMPACT METAL POWDER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3447134 1984-12-22
DE19843447134 DE3447134A1 (en) 1984-12-22 1984-12-22 CONSOLIDATION TOOL FOR COMPACTING METAL POWDER

Publications (2)

Publication Number Publication Date
EP0185951A1 EP0185951A1 (en) 1986-07-02
EP0185951B1 true EP0185951B1 (en) 1990-02-07

Family

ID=6253699

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85115038A Expired - Lifetime EP0185951B1 (en) 1984-12-22 1985-11-27 Consolidating tool for compressing metal powders

Country Status (5)

Country Link
EP (1) EP0185951B1 (en)
AT (1) ATE50181T1 (en)
DE (1) DE3447134A1 (en)
ES (1) ES8702235A1 (en)
NO (1) NO854486L (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8722690D0 (en) * 1987-09-26 1987-11-04 Penny & Giles Conductive Plast Rotary forging machines
GB2371773B (en) * 1999-07-26 2004-01-07 Agency Ind Science Techn Mould for producing artificial bone
JP3513587B2 (en) * 1999-07-26 2004-03-31 独立行政法人産業技術総合研究所 Method for producing high biocompatible artificial bone made of titanium or titanium alloy
CN103302891B (en) * 2013-05-15 2016-08-10 吉林大学 A kind of novel powder compression mold
CN103331444B (en) * 2013-07-05 2015-09-30 益阳市新纪元粉末冶金有限公司 Sintered metal product press-moulding die and application and shaping and demoulding method
CN108655396A (en) * 2018-04-13 2018-10-16 海宁金瑞金属制品有限公司 The Buffer Unit of stent in powder metallurgy forming mould

Family Cites Families (5)

* 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
DE541977C (en) * 1930-03-20 1932-01-16 Steatit Magnesia Akt Ges Split mold for pressing objects from powder or dough-like masses
US2253003A (en) * 1938-03-18 1941-08-19 Johnson Lab Inc Means for compressing finely divided substances and process therefor
FR2141434B1 (en) * 1971-06-02 1973-06-29 Lorraine Carbone
DE2501613A1 (en) * 1975-01-16 1976-07-22 Michael W Freeman Die built up of segments for metal forming - has curved segment contact interfaces ensuring favourable distribution of forces

Also Published As

Publication number Publication date
EP0185951A1 (en) 1986-07-02
ES8702235A1 (en) 1986-12-16
ATE50181T1 (en) 1990-02-15
DE3447134A1 (en) 1986-06-26
ES550157A0 (en) 1986-12-16
NO854486L (en) 1986-06-23

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