EP2382064B1 - Presswerkzeug - Google Patents

Presswerkzeug Download PDF

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Publication number
EP2382064B1
EP2382064B1 EP10701002A EP10701002A EP2382064B1 EP 2382064 B1 EP2382064 B1 EP 2382064B1 EP 10701002 A EP10701002 A EP 10701002A EP 10701002 A EP10701002 A EP 10701002A EP 2382064 B1 EP2382064 B1 EP 2382064B1
Authority
EP
European Patent Office
Prior art keywords
armature
tube
insert
housing
recess
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.)
Not-in-force
Application number
EP10701002A
Other languages
English (en)
French (fr)
Other versions
EP2382064A1 (de
Inventor
Gérard DELETTE
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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 Commissariat a lEnergie Atomique CEA, Commissariat a lEnergie Atomique et aux Energies Alternatives CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP2382064A1 publication Critical patent/EP2382064A1/de
Application granted granted Critical
Publication of EP2382064B1 publication Critical patent/EP2382064B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B30B15/024—Moulds for compacting material in powder, granular of pasta form using elastic mould parts
    • 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
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • 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

Definitions

  • the subject of the invention is a press tool according to the preamble of claim 1.
  • the manufacture of mechanical parts by powder pressing to give a compact blank, followed by sintering may involve the use of uniaxial compression machines comprising a die consisting of a housing into which the powder is poured and a punch s engaging in the housing to effect compression of the powder or, alternatively, a pair of punches engaging two opposite ends of the housing in two opposite directions. These presses operate at relatively high rates.
  • the applications are numerous: they may concern mechanical metal or ceramic parts such as gears, magnets, nuclear fuel pellets, etc.
  • Still other methods include adding rubber or other flexible materials to the matrix that facilitate demolding and are then sacrificed, but this is also expensive.
  • a variation of this design is to clamp the die by springs, external pressure, or any other means to reduce its diameter during pressing; it is exposed in the documents EP - A - 1,602,473 , US - A - 5,694,640 and in the article of Holownia "Balanced die method for metal powder compaction", published in Powder Metallurgy, vol.39, No. 3, Money Publishing .
  • the clamping is stopped after pressing, which allows the die to expand to reduce the extraction friction of the formed part and thus facilitate demolding.
  • the technical problem is somewhat different, and these methods do not contribute to improving the transition of the constraints at the exit of the matrix between the unmolded portion and the portion still retained in the matrix. It should also be noted that, in these examples, the centripetal pressure is applied only to the center of the matrix, while the edges are held rigidly in the apparatus and therefore have no flexibility.
  • the invention has been designed to obviate these disadvantages and allow automatic compression and reliable parts at high rates while reducing the risk of damage to the mold and subsequent defects in shape and size.
  • the invention thus relates to a press tool comprising a die, an armature external to the die, a flexible tube delimiting a central recess in which coin pressings are made, and an insert disposed between the flexible tube. and the frame and mobile under the action of a mechanism, characterized in that the insert slides on the tube and extends to an end of the tube through which the pressed pieces are extracted from the housing, and in that that the insert releases said end, which remains separated from the armature by a game, in another position.
  • This arrangement has the effect of allowing the tube to flex by expanding near the release orifice, and thus partially yield to the internal compressive stresses of the part. These internal stresses partially relax before demolding, with a progression towards the demolding orifice, so that the transition between the demolded parts and the parts still present in the housing is greatly attenuated when the part is demolded, and the concentrations traditionally observed strain at the junction between these two states of the room are extremely reduced or even disappeared.
  • the flexible tube is superior to the traditional chamfer or rounding at the top of the housing as it flexes according to the distribution of the internal stresses in the demolding direction and thus that it takes of itself a profile to greatly reduce the stress concentrations. And it gives a simpler design matrix than the segmented dies, and without the risk of a bad closure of the housing.
  • the tube is joined to the frame by a flange at one end of the armature opposite to the extraction location, the frame includes a recess partially delimited by the collar, and the insert comprises a movable protrusion in the recess between stop states on opposite walls of the recess.
  • the figure 1 represents a press comprising a control system 1, an upper punch 2, a lower punch 3 and a tool 4 specific to the invention which comprises a die 5.
  • the upper punch 2 and the lower punch 3 comprise rods 6 and 7 directed towards each other.
  • the matrix 5 comprises a housing 8 in the alignment of the rods 6 and 7, which can penetrate between the orifices 9 and 10 opposite.
  • the lower piston 3 and its rod 7 comprise a needle 37 which slides therein, and the rod 6 of the upper piston 2 comprises a housing 11 in front of the needle 37, which can enter therein. This arrangement makes it possible to compress hollow pieces of annular shape.
  • the invention is not limited to this situation and also relates to presses without a needle, possibly with a single punch; the dwelling would then be provided with a single orifice and would include a bottom on the other side.
  • the control system 1 governs the movement of the punches 2 and 3 and the needle 37.
  • the matrix 5 is composed of an armature 15 which is a main portion thereof, a flexible tube 16 surrounded by the frame 15 with a clearance and which delimits the housing 8, and an insert 17 of cylindrical shape and introduced between the two previous under a slippery fit.
  • the tube 16 is joined to the armature 15 by a lower flange 18 (on the side of the lower punch 3), and which delimits a recess 19 with the armature 15.
  • the insert 17 comprises a radial protrusion 20 present in the recess 19, in which it can move in the vertical direction to abut on opposite surfaces of the recess 19.
  • a control mechanism 21 acts on the insert 17 allowing it to move vertically between the two stop positions mentioned above. It may be a rod penetrating into a passage 22 of the armature 15 and attached to the protrusion 20. The rod is controlled by a means such as a jack connected to the armature 15.
  • the tube 16 An essential property of the tube 16 is that it must be flexible enough to be able to expand, this flexibility is dictated by its thickness. It must be thin, for example of thickness between 0.5 and 1 mm if it is constructed of tungsten carbide, which has good wear resistance.
  • the insert 17 is normally thicker, but its dimensions are not critical, and it can consist of a steel tube 2 to 10 mm thick.
  • the armature 15 may be in the form of a cylindrical sleeve 10 to 15 mm thick, still made of steel.
  • the insert completely withdraws from contact with the tube so as to eliminate the friction forces during demolding. It is then necessary to develop a sliding zone large enough to disengage these two elements from one another.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Forging (AREA)

Claims (2)

  1. Presswerkzeug, umfassend eine Matrix (5), eine bezüglich der Matrix äußere Bewehrungsarmatur (15), ein flexibles Rohr (16), das einen zentralen Aufnahmeraum (8) begrenzt, in welchem Pressvorgänge von Werkstücke (12) erfolgen, sowie einen Einsatz (17), der zwischen dem biegsamen Rohr und der Bewehrungsarmatur angeordnet ist und unter der Wirkung eines Antriebsmechanismus (21) beweglich bzw. verschieblich ist, dadurch gekennzeichnet dass der Einsatz auf dem Rohr gleitbar ist und sich bis zu einem Ende des Rohrs erstreckt, durch welches die gepressten Werkstücke aus dem Aufnahmeraum entnommen werden, und dass der Einsatz das genannte Ende, das von der Bewehrungsarmatur durch ein Spiel getrennt verbleibt, in einer anderen Stellung freilegt.
  2. Werkzeug nach Anspruch 1, dadurch gekennzeichnet, dass das Rohr durch einen Bund bzw. Flansch (18) mit der Bewehrungsarmatur an einem, der Entnahmestelle entgegengesetzten Ende verbunden ist, dass die Bewehrungsarmatur eine teilweise durch den Flansch begrenzte Ausnehmung (19) umschließt, und dass der Einsatz (17) einen Ansatz (20) aufweist, der in der Ausnehmung zwischen Zuständen verschieblich ist, in denen er an entgegengesetzten Wandungen der Ausnehmung anliegt.
EP10701002A 2009-01-23 2010-01-19 Presswerkzeug Not-in-force EP2382064B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0950407A FR2941636B1 (fr) 2009-01-23 2009-01-23 Outillage de presse
PCT/EP2010/050555 WO2010084110A1 (fr) 2009-01-23 2010-01-19 Outillage de presse

Publications (2)

Publication Number Publication Date
EP2382064A1 EP2382064A1 (de) 2011-11-02
EP2382064B1 true EP2382064B1 (de) 2012-11-07

Family

ID=40823500

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10701002A Not-in-force EP2382064B1 (de) 2009-01-23 2010-01-19 Presswerkzeug

Country Status (7)

Country Link
US (1) US8647563B2 (de)
EP (1) EP2382064B1 (de)
JP (1) JP5627605B2 (de)
KR (1) KR101698077B1 (de)
ES (1) ES2399334T3 (de)
FR (1) FR2941636B1 (de)
WO (1) WO2010084110A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102189706B (zh) * 2011-01-28 2014-10-08 南京理工大学 管状材料高压剪切变形方法及其装置
KR101493974B1 (ko) * 2013-05-24 2015-02-17 한국전기연구원 실리콘 부스바 제조방법
CN106077634B (zh) * 2016-08-24 2018-06-12 广州晶体科技有限公司 串珠冷压模及采用该冷压模的串珠生产方法
CN106077633B (zh) * 2016-08-24 2018-06-12 广州晶体科技有限公司 串珠冷压模及采用该冷压模的串珠生产方法
CN111590069A (zh) * 2020-06-28 2020-08-28 南安市铭基金刚石工具有限公司 一种串珠机冷压设备及冷压方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2558823A (en) * 1949-05-27 1951-07-03 Henry L Crowley Apparatus for molding articles
US2942298A (en) * 1954-12-28 1960-06-28 Unexcelled Chemical Corp Molding apparatus
SU454133A1 (ru) * 1973-01-26 1974-12-25 Предприятие П/Я В-8469 Пресс-форма дл изостатического спрессовани изделий
SU1303436A1 (ru) * 1985-03-04 1987-04-15 Пермский политехнический институт Пресс-форма дл прессовани порошковых материалов с высоким коэффициентом трени
SU1315135A1 (ru) * 1986-01-02 1987-06-07 Всесоюзный научно-исследовательский и проектный институт тугоплавких металлов и твердых сплавов Пресс-форма
GB9318581D0 (en) * 1993-09-08 1993-10-27 Manganese Bronze Ltd Method of and apparatus for producing a compression product
US7128547B2 (en) 2004-01-13 2006-10-31 Chien-Min Sung High pressure split die and associated methods
DE102004026969A1 (de) * 2004-06-02 2005-12-29 Sms Meer Gmbh Vorrichtung zum Herstellen eines Formteils aus Pulver
EP1745891B1 (de) * 2005-07-19 2008-11-05 Abrasive Technology, Inc. Verfahren und Vorrichtung zum Herstellung von Schleifwerkzeugen
US7381046B2 (en) * 2006-06-27 2008-06-03 Fu Chin Kuo Lipstick making device
AT505947B1 (de) * 2007-11-14 2016-04-15 Miba Sinter Austria Gmbh Verdichtungswerkzeug

Also Published As

Publication number Publication date
JP5627605B2 (ja) 2014-11-19
WO2010084110A1 (fr) 2010-07-29
FR2941636A1 (fr) 2010-08-06
US8647563B2 (en) 2014-02-11
KR20110112814A (ko) 2011-10-13
JP2012515652A (ja) 2012-07-12
EP2382064A1 (de) 2011-11-02
ES2399334T3 (es) 2013-03-27
KR101698077B1 (ko) 2017-01-19
US20110280982A1 (en) 2011-11-17
FR2941636B1 (fr) 2012-12-07

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