EP2382064A1 - Outillage de presse - Google Patents
Outillage de presseInfo
- Publication number
- EP2382064A1 EP2382064A1 EP10701002A EP10701002A EP2382064A1 EP 2382064 A1 EP2382064 A1 EP 2382064A1 EP 10701002 A EP10701002 A EP 10701002A EP 10701002 A EP10701002 A EP 10701002A EP 2382064 A1 EP2382064 A1 EP 2382064A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- insert
- tube
- housing
- recess
- frame
- 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
Links
- 239000011159 matrix material Substances 0.000 claims description 13
- 238000003825 pressing Methods 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 abstract description 9
- 238000007906 compression Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 description 12
- 239000000843 powder Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000007704 transition Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003879 lubricant additive Substances 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
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.
- 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. This kind of process, however, has disadvantages. One of the most important appears in the release of the compressed part gradually out of the housing by an axial movement of pushing the punch.
- the compression has produced radial stresses in the workpiece, which are released as it exits the housing producing radial expansion.
- the risk of damage to the part by cracking or rupture is frequent at the orifice of the housing, between the portions still constrained and the portions suddenly released, where stress concentrations appear.
- Various processes have been employed to improve the quality of the parts. Mention may be made of the use of lubricant additives or binders in powders or the choice of particular compression sequences by the punches; but the additives interfere with sintering since they are volatile and can be pollutants, and the second processes slow down the production rates considerably. These two groups of processes moreover remedy other defects, such as insufficient cohesion of the material after compression.
- 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.
- Another kind of method described for example in document US Pat. No. 7,128,547, consists in dividing the matrix into sectors that are assembled during the execution of the compression and then discarded so as to relax the compression constraints. residual for both the whole room. The achievements of such processes often do not There is no way to restrain the die sectors once it has been loosened, rendering them unsuitable for automation. Others have a sector motion control mechanism to automate the process, but they are complex, requiring the use of sector actuators, and they do not really guarantee that the sectors are well joined when the powder is paid, which is necessary for good manufacturing.
- 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 disclosed in EP-A-I 602 473, US-A-5 694 640 and in the Holownia article "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.
- 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 parts are extracted from the housing, and in that that the insert releases said end, which is separated from the frame 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 greater than 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.
- FIG. 1 illustrates a press equipped with a tool
- FIG. 2 illustrates the phenomenon encountered
- FIG. 3 illustrates the matrix
- FIG. 4 illustrates another state of the matrix
- FIG. 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 in a sliding fit.
- the tube 16 is joined to the armature 15 by a lower flange 18 (on the lower punch 3 side), 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.
- the top of the tube 16, located in front of the game 23 has the ability to expand when the piece 12 arrives at its height then undergoes demoulding, which reduces the stress concentrations at the orifice 13 of the housing 8.
- a property is The sensitivity of the tube 16 is that it must be sufficiently flexible 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 from 2 to 10mm thick.
- the armature 15 may be in the form of a cylindrical sleeve 10 to 15 mm thick, still made of steel. According to a development of the invention, in the context of its operation, it can be provided that the insert completely withdraws from contact with the tube so as to eliminate 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)
Abstract
Description
Claims
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 true EP2382064A1 (fr) | 2011-11-02 |
EP2382064B1 EP2382064B1 (fr) | 2012-11-07 |
Family
ID=40823500
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10701002A Not-in-force EP2382064B1 (fr) | 2009-01-23 | 2010-01-19 | Outillage de presse |
Country Status (7)
Country | Link |
---|---|
US (1) | US8647563B2 (fr) |
EP (1) | EP2382064B1 (fr) |
JP (1) | JP5627605B2 (fr) |
KR (1) | KR101698077B1 (fr) |
ES (1) | ES2399334T3 (fr) |
FR (1) | FR2941636B1 (fr) |
WO (1) | WO2010084110A1 (fr) |
Families Citing this family (5)
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)
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 (fr) * | 2005-07-19 | 2008-11-05 | Abrasive Technology, Inc. | Procédé et dispositif de fabrication d'outils abrasifs |
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 |
-
2009
- 2009-01-23 FR FR0950407A patent/FR2941636B1/fr not_active Expired - Fee Related
-
2010
- 2010-01-19 ES ES10701002T patent/ES2399334T3/es active Active
- 2010-01-19 WO PCT/EP2010/050555 patent/WO2010084110A1/fr active Application Filing
- 2010-01-19 JP JP2011546773A patent/JP5627605B2/ja not_active Expired - Fee Related
- 2010-01-19 US US13/145,702 patent/US8647563B2/en active Active
- 2010-01-19 EP EP10701002A patent/EP2382064B1/fr not_active Not-in-force
- 2010-01-19 KR KR1020117015847A patent/KR101698077B1/ko active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO2010084110A1 * |
Also Published As
Publication number | Publication date |
---|---|
KR20110112814A (ko) | 2011-10-13 |
EP2382064B1 (fr) | 2012-11-07 |
JP5627605B2 (ja) | 2014-11-19 |
KR101698077B1 (ko) | 2017-01-19 |
JP2012515652A (ja) | 2012-07-12 |
WO2010084110A1 (fr) | 2010-07-29 |
FR2941636B1 (fr) | 2012-12-07 |
FR2941636A1 (fr) | 2010-08-06 |
ES2399334T3 (es) | 2013-03-27 |
US20110280982A1 (en) | 2011-11-17 |
US8647563B2 (en) | 2014-02-11 |
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