EP1687111B1 - Dispositif de remplissage d'un moule par une poudre ou un melange de poudres - Google Patents

Dispositif de remplissage d'un moule par une poudre ou un melange de poudres Download PDF

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Publication number
EP1687111B1
EP1687111B1 EP04816495A EP04816495A EP1687111B1 EP 1687111 B1 EP1687111 B1 EP 1687111B1 EP 04816495 A EP04816495 A EP 04816495A EP 04816495 A EP04816495 A EP 04816495A EP 1687111 B1 EP1687111 B1 EP 1687111B1
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EP
European Patent Office
Prior art keywords
powder
filling device
deflector
filling
powders
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
EP04816495A
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German (de)
English (en)
French (fr)
Other versions
EP1687111A1 (fr
Inventor
Stéphane REVOL
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.)
Federal Mogul Operations France SAS
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Federal Mogul Operations France SAS
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, Federal Mogul Operations France SAS filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP1687111A1 publication Critical patent/EP1687111A1/fr
Application granted granted Critical
Publication of EP1687111B1 publication Critical patent/EP1687111B1/fr
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
    • B30B15/30—Feeding material to presses
    • B30B15/302—Feeding material in particulate or plastic state to moulding presses
    • 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
    • B22F3/004—Filling molds with powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
    • B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles

Definitions

  • the invention relates to a device for filling a mold, in particular a compression mold, with a powder or a mixture of powders in a wide variety of fields such as construction materials, pharmaceuticals, foodstuffs and nuclear ceramics. , cement, sintered metal powders.
  • the field of the invention is that of impression filling systems with finely divided materials in order to achieve their compression.
  • solutions are sought for depositing or transporting powder in a controlled, homogeneous and rapid manner in a compression mold.
  • it is sought to achieve controlled and flexible filling of a mold for uniaxial compression, or hot isostatic pressing, or sintering with a mixture of powders.
  • powder metallurgy many components are made by compression of metal powders obtained thermochemically or by spraying.
  • the powders are deposited in a cavity or impression of a matrix having the shape that we want to give the component, then the powders are compressed under very high pressure.
  • the tablets obtained are then sintered, that is to say heated at very high temperatures, so that the compressed powders are bonded together in a compact mass which has sufficient mechanical properties to form a solid.
  • volumetric gravity filling of a footprint One of the most used methods is volumetric gravity filling of a footprint.
  • the disadvantage presented by this technique is that it does not control the filling of the impression.
  • significant variations in the weight of the powders are observed in the imprint, and inhomogeneous distributions of powders in the imprint.
  • the device according to the invention makes it possible to project a powder in the form a suspended web which is intercepted by deflectors placed in the path of the powder and positioned in such a way that the intercepted powder falls at a precise point of the mold to be filled.
  • the device may comprise several means for ejecting the powder introduced into the device in the form of a sheet, each of these means being able to dispense a different powder.
  • sheet of powder means a set of grains that occupy a small volume in front of the dimensions of its surface. This set can be a portion of plan, be curved or other shape.
  • the deflector is orientable.
  • the deflector is mobile.
  • the deflector can therefore, for example, be moved vertically and turn on itself.
  • the deflector may, for example, be a part of the plane, be concave, convex, have a helical portion ...
  • the means for ejecting the powder in the form of a sheet is a rotary device.
  • the rotary device advantageously has a shape chosen from a disk, a cone or a bowl.
  • the device rotates about an axis of rotation located at the center of symmetry of the device.
  • the rotary device comprises at least one fin.
  • the fin will advantageously be placed along the radius of said disk, cone or bowl.
  • the fins have the same type of shape as the baffles, that is to say they can be flat, concave, convex, helical ...
  • fins on the disc, cone or bowl is intended to facilitate the flight of the powder and control it. Instead of the fins, it is possible to use a rough coating or having microgrooves in order to transfer the amount of energy required to form the sheet of powder.
  • the at least one fin is orientable.
  • the rotary device comprises a lower part and an upper part spaced from each other by a determined space, the upper part having an orifice allowing the entry of the powder and the space between the two parts allowing the exit of the powder.
  • the rotary device is an element having a powder inlet and a powder outlet, said element being arranged so that the powder exiting at the outlet has sufficient inertia so that the powder is projected out of the water.
  • this element is a curved tube.
  • the axis of rotation of this rotation device is concomitant with the tube portion where the powder inlet is located.
  • the means for introducing at least one powder are at least one container comprising a powder inlet and a powder outlet
  • the means for ejecting the powder in the form of a sheet is a means for rapidly moving the at least one container and stop it suddenly so that the powder it contains is projected out of the container by inertia. Note that the entry of the powder can correspond to the output of the powder.
  • the at least one deflector is placed parallel to the axis of rotation about which the means rotates to eject the powder in the form of a sheet.
  • the at least one deflector may also be placed perpendicular to the mean plane of ejection of the sheet of powder, the means for ejecting the powder is a rotary device or not.
  • the at least one deflector is a part of the inner wall of the device.
  • the at least one deflector has a shape adapted to the shape of the determined location of the mold to be filled.
  • the at least one deflector is advantageously placed above the cavity that it must fill and it has the same shape or a similar shape as said cavity.
  • the device according to the invention has many advantages.
  • the device allows to quickly fill a mold.
  • the filling of the powder or powders is carried out without having to introduce a complementary amount of gas into the system during the setting in motion of the powder.
  • the device according to the invention makes it possible to feed different areas of the impression with each a controlled powder flow.
  • the device makes it possible to create and deposit, without destabilizing it in the mold, a mixture of powders whose different components have very different densities.
  • the flow and composition of the powders can be controlled in space, it is possible to modulate the height of the compacted part to obtain the composition of the mixture and the apparent density of deposited powders. In particular, it is possible to control the horizontality and the flatness of the deposited powders.
  • the device does not require the use of powder having a good flowability. Indeed, no flow in a small diameter pipe is not used. The choice of powders is thus expanded.
  • the invention makes it possible to grind the powders upon introduction of granulated powders into the system, which is of great interest for carbides and nuclear materials.
  • the embodiments described below will relate to the filling of molds with a powder and with a mixture of powders.
  • the filler materials used are powders intended to be shaped, for example by sintering, compression, compression-sintering or hot isostatic pressing. These are for example metal powders, ceramics or their mixture.
  • the powders used must satisfy the manufacturing requirements of the sintered object, especially as regards particle size, purity and compressibility.
  • the powders used have a diameter of less than 3 mm, preferably less than 1 mm.
  • the feeding of the filling device according to the invention is done by arranging the doses defined by volumetric or weightwise pre-dosing of powders in said device or by introducing the powders via a hopper (reservoir in truncated and inverted quadrangular pyramid shape) with a tubular connection.
  • a hopper reservoir in truncated and inverted quadrangular pyramid shape
  • the hopper can be inclined or placed at the periphery of the disc. It can be replaced by a worm, a tube ...
  • the hopper-body connection of the device is generally controlled by a shutter, which also allows to dose the amounts of powder introduced on the tray and the time of d 'introduction.
  • FIGS. 1 and 2 it is desired to fill a mold 2 with the aid of the device 1 according to the invention.
  • the powder 3 is contained in a hopper 4 formed in the upper part of a body 20 of the device. It falls progressively on a plate 5, rotating about a central axis 6, located just below the hopper 4.
  • the plate 5 has the shape of a disk.
  • the sheet of powder 7, ejected by the plate 5 strikes the wall 21 of the body of the device: this wall plays the role of deflector.
  • the wall 22, placed lower than the wall 21, can also act as a deflector.
  • the sheet of powder 7 then comes into contact with the baffles 9 fixed, radial and vertical relative to the rotary plate 5.
  • the deflectors 9 are integral with a central element 8 which has the shape of a cylinder.
  • the powder 3 is thus distributed in the mold 2 or cavity located below the baffles 9. It is specified that the element 8 and the baffles 9 are fixed; only the plate 5 rotates.
  • the sheet after a first reflection on the body can be redirected to other walls (such as those of the body or the central element) before reflecting on the baffles 9. All these walls form a set of deflectors for controlling the grain flow.
  • the rotational speed of the turntable is 100 to 10,000 revolutions per minute depending on the powders and the energy to be supplied to the powder.
  • this speed is between 100 and 5000 revolutions per minute.
  • FIG. 3 represents a device according to the invention composed of a set of powder deflectors making it possible to distribute, in a controlled and flexible manner, different layers of quasi-horizontal powders (average direction between + or -90 ° relative to the horizontal) at different places of a mold.
  • the mold 10 in question has two cavities: a deep and narrow cavity 11, and a shallow and wide cavity 12 whose bottom gives on the cavity 11.
  • two disks (13 and 14), rotating around a common central axis 15, each receive a different powder, here called powder A and powder B, which they eject in the form of a sheet of aerated powder and of determined thickness.
  • Powders can be inserted into the discs using a two-outlet hopper or several hoppers. It is obvious that the disks can be carried by different axes.
  • baffles of different widths are installed perpendicular to the plane of rotation of these two rotating disks (13 and 14) in the path of the powder sheets A and B.
  • three deflectors of identical shapes are available. (16, 17 and 18) and a deflector 19 having an obvious in the portion in contact with the powder A.
  • the baffles are placed so that a precise location of the impression can be filled with powder.
  • These four deflectors being of flat shape, they are placed just above the respective cavities of the mold they must fill.
  • these four deflectors intercept the different layers of powders at specific locations corresponding to the cavities to be filled with a given imprint.
  • each deflector by its geometry and positioning (which is modifiable during a filling operation) participates in the distribution of the one or more powders in a mold.
  • the shapes of the deflectors are varied (concave, flat, convex, helical shapes ...) and that the deflectors can tilt in all directions relative to the plane of the plate.
  • each baffle has an influence on the amount of powder that deviates towards the impression.
  • the deflector 19 is wider than the deflectors 16, 17 and 18 at the intercepting zone of the powder B.
  • the deflector 19 thus captures more powder B than the other deflectors and the where it deposits said powder intercepted in the cavity (ie the cavity 11) fills more quickly than the other cavities.
  • the use of deflectors of different width can be interesting if one wants to fill places of the footprint having not the same depths.
  • the deflector 19 presents a recess where it catches the powder A, and that this recess is absent at the place where it catches the powder B.
  • the deflector 19 thus intercepts the powder A
  • the cavity 11 of the cavity 10 will therefore be enriched in powder A and contain traces of powder B.
  • the baffles 16, 17 and 18 intercept as much powder A as powder B.
  • deflectors vertically during the filling or to turn them, for example so that they deflect more than powder or to adapt to a changing rotational speed of the disk, which has an impact on the speed of the powder ejected.
  • the imprint used with this device according to the invention has a dimension of up to 200 mm.
  • the tablecloths of powders used to fill the imprints can be obtained in different ways.
  • This rotary device can have the form of a disc, a bowl, a cone ...
  • the rotating device may be of a metallic, ceramic, polymer or other nature. Its surface state can be adjusted from a polished state to a state very rough depending on the desired trajectory of the powder particles.
  • the rotary device does not necessarily have a flat geometry.
  • the device may for example be in the form of a cone (that is to say a triangular section 30) (see FIG. 4), a bowl (circular or approximately circular section 31) (see FIG. 5) or any other form for orienting the sheet of powder 7.
  • the disc, the bowl or the cone may include on its surface particular shapes of a nature to adjust the energy transmission of the disc to the powder. These shapes may be cylinders (made by the addition of pins for example), half-spheres (made by local sinking of the disc) or any other shape that will influence the entrainment of the powder on the disc or bowl .
  • the disc or bowl may have fins on their surface. For example, in Fig. 7, there is shown a triangular disc having helical fins extending from the top of the disc.
  • the sheet of powder can also be obtained by scanning a jet at a high frequency.
  • the web is then the materialization of the envelope of the different trajectories of the powder particles.
  • This sheet of powder can be defined by a powder jet that will scan at a high frequency a given area.
  • the whole swept area will be named "tablecloth”.
  • An exemplary principle is illustrated in FIG. 8.
  • the powder is for example accelerated in an elbow tube 36 by rotating said tube.
  • the geometry of said tube will determine the trajectory of the ejected powder.
  • the orifice of the tube describes a circular geometry.
  • the powder sheet will in this case be symmetrical with respect to the axis of rotation of the tube, as when using a disc or rotating bowl.
  • the sheet of powder can also be obtained by accelerating the powder contained in containers.
  • the powder is disposed in a container 37 having one or more compartments of low height relative to its other dimensions.
  • One of the vertical faces of the container does not contain a wall or has a removable wall to access the compartments. This wall will be removed when it is desired to eject the powder outside the container. In this case, the container will be accelerated towards the area where it is desired to create the sheet.
  • the container is abruptly blocked.
  • the powder under the effect of its inertia during said sudden stop, is then ejected in the form of "Web" through the opening 39 provided for this purpose (see Figure 10).
  • this sheet may then be controlled and / or calibrated by adapting the shape of the outlet opening of the container.
  • the sheet is composed by the different powder projections initiated by each of the compartments.
  • the superposed compartments are filled with different powders (see FIG. 10). Thus, different parallel layers are created.
  • the web can be accelerated with a gas provided that the accelerator gas does not pass or accumulate in the mold or even the area where the deflectors.
  • the powder or powders that are retained can undergo for example a so-called uniaxial compression, which consists in agglomerating the powder or mixture of powders contained in the mold by applying a strong pressure (1 to 8 kbar).
  • the resulting tablet can then be made mechanically resistant by subjecting it to sintering treatment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Basic Packing Technique (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP04816495A 2003-11-28 2004-11-25 Dispositif de remplissage d'un moule par une poudre ou un melange de poudres Not-in-force EP1687111B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0350933A FR2862893B1 (fr) 2003-11-28 2003-11-28 Dispositif de remplissage d'un moule par une poudre ou un melange de poudres
PCT/FR2004/050618 WO2005051576A1 (fr) 2003-11-28 2004-11-25 Dispositif de remplissage d'un moule par une poudre ou un melange de poudres

Publications (2)

Publication Number Publication Date
EP1687111A1 EP1687111A1 (fr) 2006-08-09
EP1687111B1 true EP1687111B1 (fr) 2007-02-28

Family

ID=34566380

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04816495A Not-in-force EP1687111B1 (fr) 2003-11-28 2004-11-25 Dispositif de remplissage d'un moule par une poudre ou un melange de poudres

Country Status (9)

Country Link
US (1) US7927091B2 (ja)
EP (1) EP1687111B1 (ja)
JP (1) JP4727588B2 (ja)
CN (1) CN1886219B (ja)
AT (1) ATE355146T1 (ja)
DE (1) DE602004005070T2 (ja)
ES (1) ES2284082T3 (ja)
FR (1) FR2862893B1 (ja)
WO (1) WO2005051576A1 (ja)

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FR2882029B1 (fr) * 2005-02-14 2011-03-11 Commissariat Energie Atomique Dispositif de distribution d'au moins un materiau granulaire dans un recipient, dispositif de remplissage et procede de remplissage utilisant un tel dispositif
KR100669256B1 (ko) * 2005-05-23 2007-01-16 주식회사 화인테크닉스 분체정량공급기 및 이를 갖는 원료공급장치와분체정량공급방법
CN101015963B (zh) * 2007-02-16 2011-08-17 苏长春 粉末压模机的恒量送料机构
FR2916427B1 (fr) * 2007-05-23 2012-01-13 Commissariat Energie Atomique Dispositif de remplissage pour au moins deux materiaux granulaires et procede de remplissage mettant en oeuvre un tel dispositif
FR2938836B1 (fr) 2008-11-27 2011-09-23 Commissariat Energie Atomique Dispositif et procede de depot d'un melange de poudres pour la formation d'un objet a gradients de composition
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GB201302931D0 (en) * 2013-02-20 2013-04-03 Rolls Royce Plc A method of manufacturing an article from powder material and an apparatus for manufacturing an article from powder material
RU2536021C1 (ru) * 2013-08-21 2014-12-20 Открытое акционерное общество "Всероссийский институт легких сплавов" (ОАО "ВИЛС") Установка для заполнения и герметизации капсул с металлическим порошком
DE102014006374A1 (de) 2014-05-05 2015-11-05 Gkn Sinter Metals Engineering Gmbh Vorrichtung zur Herstellung eines Rohlings nebst Verfahren hierzu und Rohling
DE102014006372A1 (de) 2014-05-05 2015-11-05 Gkn Sinter Metals Engineering Gmbh Schichten eines Wasserstoffspeichers und deren Herstellung
CN106914979B (zh) * 2017-03-08 2022-05-17 郑州远东耐火材料有限公司 一种锆刚玉无缩孔砖等厚度冒口砂型、模具及填充方法
CN111118613B (zh) * 2020-02-21 2021-11-16 苏州市相城区渭塘城乡发展有限公司 多轴转动板装置
GB202002540D0 (en) * 2020-02-24 2020-04-08 Rolls Royce Plc Isostatic pressing canister
CN111604499A (zh) * 2020-06-04 2020-09-01 济南大学 一种类3d打印技术的金属粉末均匀混粉/填充模腔的方法、系统及多腔送料靴
IT202100002525A1 (it) * 2021-02-04 2022-08-04 Sacmi Apparato e metodo per riempire uno stampo.
DE102021129835A1 (de) 2021-11-16 2023-05-17 Dorst Technologies Gmbh & Co. Kg Pulver-Pressenanlage sowie Verfahren zum Pulverpressen eines Pulverpressteils

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Also Published As

Publication number Publication date
DE602004005070D1 (de) 2007-04-12
FR2862893A1 (fr) 2005-06-03
JP4727588B2 (ja) 2011-07-20
WO2005051576A1 (fr) 2005-06-09
CN1886219A (zh) 2006-12-27
US20070071632A1 (en) 2007-03-29
ATE355146T1 (de) 2006-03-15
EP1687111A1 (fr) 2006-08-09
FR2862893B1 (fr) 2006-02-24
JP2007533486A (ja) 2007-11-22
CN1886219B (zh) 2011-02-23
ES2284082T3 (es) 2007-11-01
US7927091B2 (en) 2011-04-19
DE602004005070T2 (de) 2007-11-15

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