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EP0320811B1 - Verfahren zur Herstellung einer Form zum Herstellen sehr kleiner Formkörper - Google Patents

Verfahren zur Herstellung einer Form zum Herstellen sehr kleiner Formkörper Download PDF

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Publication number
EP0320811B1
EP0320811B1 EP88120579A EP88120579A EP0320811B1 EP 0320811 B1 EP0320811 B1 EP 0320811B1 EP 88120579 A EP88120579 A EP 88120579A EP 88120579 A EP88120579 A EP 88120579A EP 0320811 B1 EP0320811 B1 EP 0320811B1
Authority
EP
European Patent Office
Prior art keywords
shell
matrix
parts
mold
blank
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
EP88120579A
Other languages
English (en)
French (fr)
Other versions
EP0320811A1 (de
Inventor
Thomas Gladden
Fritz Füllemann
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.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
Eta SA Fabriques dEbauches
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 Eta SA Fabriques dEbauches filed Critical Eta SA Fabriques dEbauches
Publication of EP0320811A1 publication Critical patent/EP0320811A1/de
Application granted granted Critical
Publication of EP0320811B1 publication Critical patent/EP0320811B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
    • 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
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • 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
    • B22F5/007—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of moulds
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Definitions

  • the subject of the present invention is a process for producing a mold intended for the manufacture of parts of very small dimensions, that is to say parts of which one of the dimensions does not exceed a few millimeters.
  • the invention is particularly applicable in watchmaking for the production of molds intended for the manufacture by injection of magnetic rotors of motor assemblies of quartz watches. It also applies to the production of molds for the production of parts by stamping.
  • a magnetic rotor for a quartz watch includes a disc-shaped magnet and an injection molded part.
  • This part comprises a housing, of generally cylindrical shape, forming a housing for the magnet, an upper axis comprising a pinion, a bearing and a pivot, and a lower axis comprising a bearing and a pivot.
  • This magnetic rotor has an axial length of approximately 3 mm and a diameter, for the housing, of approximately 2 mm.
  • the diameter of the pinion is generally between 0.5 mm and 1 mm, and the pivots have a diameter of the order of 0.1 mm.
  • the magnetic rotor is obtained by injection molding.
  • the mold is produced in a metal block by techniques such as sparking or electro-erosion.
  • the invention aims to solve this problem.
  • the invention aims in particular to allow the production of molds intended for the manufacture of magnetic rotors for quartz watches comprising pinion wings with complex profile for a pinion having a diameter of less than 1 mm.
  • the invention relates more generally to the production of molds for the manufacture of parts of very small dimensions comprising patterns with complex profiles and of size not exceeding a few tenths of a millimeter.
  • the method of the invention consists in producing the mold from a powder comprising at least one sintered metal (designated by “metal powder” in the remainder of the text), which is formed by molding on a matrix having the form parts to be manufactured.
  • the process of the invention is completely different from the known process of making parts from a sintered metal powder.
  • the invention resides in the fact of making a negative of the mold by machining a matrix, then of making a negative of this matrix to obtain the mold, this double operation making it possible to define the shape of the mold on a part in relief - the matrix - which can be worked easily while, according to the prior art, the mold is produced directly in the hollow by hollowing out a part.
  • the matrix used to make the mold at dimensions greater than those of the parts which will be manufactured subsequently to take account of the shrinkage suffered by the shell during the sintering operation. It is known that shrinkage is determined precisely by the respective proportions of bonding agent and metal powder.
  • the matrix corresponding to a shell is produced with dimensions greater by 5% to 25% than those of this shell.
  • Using a matrix to define the mold makes it possible to use techniques such as bar turning, which has the advantage of offering better resolution than sparking or EDM.
  • a gain in resolution is also obtained by the simple fact that the matrix has dimensions greater than those of the parts to be produced.
  • the method of the invention therefore makes it possible to produce patterns of small dimensions with complex profiles.
  • FIGS. 1a to 1e illustrate the successive stages of the method of the invention, in the case of a mold produced from a single matrix.
  • the first step consists in producing a matrix 100, as shown in FIG. 1a, comprising a support 102 and a part 104 having the shape of the parts to be manufactured and dimensions slightly greater than these parts.
  • the matrix 100 is preferably obtained by machining a block of hard material such as steel.
  • the second step of the process consists in obtaining a mold blank from this matrix.
  • the part 104 of the matrix 100 is placed in a cavity 106 which is defined by the assembly of two elements 108 and 110.
  • the matrix 100 is fixed in a cavity by its support 102.
  • An orifice 112 formed in the element 108 allows the injection into the cavity of the mixture composed of the metal powder and the bonding agent.
  • a mold blank 116 is thus obtained as shown in FIG. 1c.
  • a channel 118 can be produced in this mold by machining or by placing in the cavity 106 a rod 114 between the matrix 100 and the edge of the cavity.
  • This rod may be an integral part of the matrix 100 or constituted by a protuberance from the surface of the element 110.
  • FIG. 1d shows the mold blank 116 in an oven 120.
  • the bonding agent is removed by heating, then the mold blank is sintered.
  • the shrinkage undergone by the mold blank during this step cancels the excess initial dimension of the mold created by the difference in dimensions between the die and the parts to be manufactured.
  • Figure 1e shows the use of the mold obtained according to the method of the invention.
  • the mold 116 is assembled with a cover 122 to form a cavity 124 having the shape and dimensions of the parts to be manufactured.
  • the channel 118 makes it possible to inject the desired material for manufacturing the parts into this cavity.
  • FIGS. 2a and 2b The magnetic rotor to be manufactured is shown in FIGS. 2a and 2b, on which it is designated by the reference numeral 2.
  • a magnet 4 having the shape of a disc, and a molded part comprising 3 parts: a housing 6, of generally cylindrical shape, containing the magnet 4, an upper axis 8 comprising a pinion 10, a bearing surface 12 and a pivot 14, and a lower axis 16 comprising a bearing 18 and a pivot 20.
  • the magnet 4, the housing 6 and the axes 8, 16 are aligned on the same axis.
  • the housing 6 may include one or more recesses 22 which, as will be seen in the following text, correspond to parts of the mold which have the function of holding the magnet 4 in position during the injection molding of the part 2.
  • the magnetic rotor shown in Figures 2a and 2b has an axial length of about 3 mm and a diameter of about 2 mm.
  • the pivots 14, 20 have a diameter of about 0.1 mm; the wings 24 of the pinion 10 define a toothing also having a depth of the order of 0.1 mm.
  • the mold intended for the manufacture of this magnetic rotor is produced, in accordance with the invention, in three stages.
  • the first step is to make one or more dies, each corresponding to a part of the part to be manufactured.
  • two dies are advantageously used, as shown in Figures 3a and 3b. These dies correspond respectively to the upper part and to the lower part of the magnetic rotor, defined with respect to a plane perpendicular to the axis of the rotor and dividing the magnet 4 into two substantially equal parts.
  • FIG. 3a illustrates, in front view, a matrix 26, called the upper matrix, comprising on a support 28 the elements corresponding to the upper half of the magnetic rotor.
  • the matrix upper 26 is machined from a hard material, for example steel, to produce on the support 28 an element 30 of generally cylindrical shape comprising recesses 32 and bulges 34.
  • the element 30 thus has the external shape of the housing 6 and of the magnet 4.
  • a pinion 36, a bearing surface 38 and a pivot 40 are machined.
  • the upper die 26 is produced with dimensions slightly greater than those of the magnetic rotor to be manufactured.
  • the ratio of the dimensions of the matrix to those of the workpiece is, for example, from 1.05 to 1.25, and is preferably close to 1.15.
  • the dimensions of the magnetic rotor to be manufactured have been indicated by a dotted line 42.
  • FIG. 3b shows, in front view, a matrix 44, called the lower matrix, corresponding to the lower half of the magnetic rotor.
  • This matrix comprises a support 46 on which an element 30 is machined comprising a recess 32 and a bulge 34, which forms the second half of the housing 6 and of the magnet 4, a bearing surface 48 and a pivot 50.
  • the lower die 44 is machined with dimensions slightly greater than those of the magnetic rotor to be manufactured.
  • the lower half of the magnetic rotor is represented by a dotted line 52.
  • Each matrix is obtained by machining a block of hard material, for example a metal block.
  • the machining can be carried out according to any technique known to those skilled in the art; however, preferably, the machining of the dies is carried out by bar turning, or any other similar technique, this technique having the advantage of making it possible to obtain complex profiles for the toothing of the pinion, even when the depth of the toothing does not not exceed 0.1 mm.
  • the realization of the dies of the part to be manufactured constitutes the first step of the process of the invention.
  • the next step is to make blanks for each shell by injecting a metal powder into cavities containing these dies.
  • FIGS. 4a and 4b show a device for implementing the second step of the method of the invention, respectively in the closed position before injection and in the open position after injection.
  • This device mainly comprises a fixed plate 54, a movable plate 56 and a movable plate 58. These plates are made for example of steel.
  • the plate 56 can be moved in translation, along an axis perpendicular to the surface of the plate 54, so as to be placed on the plate 54 or on the contrary so as to be distant therefrom.
  • the plate 58 can be moved along the same axis to be brought into contact with the plate 56 or to be distant therefrom.
  • the translational movement of the plates 56 and 58 is guided by conventional means not shown.
  • the intermediate plate 56 has a cylindrical recess 60 which, when the three plates are in contact as shown in FIG. 4a, constitutes a cavity in which is placed a matrix 62 for the production of a shell blank.
  • the device is used successively to produce two blanks of shells from the upper 26 and lower 44 dies shown in FIGS. 3a and 3b.
  • the matrix 62 placed in the cavity is fixed on the lower face 64 of the plate 58. This fixing is ensured by suction, gluing, welding or other of the support 66 (respectively 28 and 46 in Figures 3a and 3b) of the matrix 62 (respectively 26 and 44) in a blind hole 68 made on the underside 64 of the plate 58.
  • a supply channel 70 is provided for injection into the cavity of the material in which the blank of the shell is produced.
  • a receiving channel 72 is also produced at the base of the cavity to receive the excess of the injected material.
  • the device also comprises centering rods 74, 76 which are guided in holes 78, 80 in the plate 58. These rods pass through the cavity; as can be seen in FIG. 4b, these rods make it possible to create in the molded shell 86 channels 82, 84 which can be used as a means for positioning the different shells forming the mold between them.
  • a channel 85 corresponding to the channel 118 visible in FIG. 1c is also provided.
  • the material from which the shells are made comprises a metallic powder which, for the injection operation, is mixed with a binding agent.
  • the grain size of the powder is preferably between 1 and 5 micrometers to guarantee an optimal proportion of metal in the mixture of powder and bonding agent.
  • the material can be a metal, a semi-metal or an alloy such as a carbide, for example a titanium or tungsten carbide, a nitride, for example a titanium or niobium nitride, or a heavy metal, for example iron, nickel, cobalt, chromium or molybdenum, or an alloy of these heavy metals, or a ceramic type material, for example Al2O3, ZnO2 or a mixture of Al2O3 and ZnO2.
  • a carbide for example a titanium or tungsten carbide
  • a nitride for example a titanium or niobium nitride
  • a heavy metal for example iron, nickel, cobalt, chromium or molybdenum, or an alloy of these heavy metals
  • a ceramic type material for example Al2O3, ZnO2 or a mixture of Al2O3 and ZnO2.
  • tungsten carbide it is advantageously added with cobalt in a proportion of 3 to 12% by weight of the mixture.
  • titanium carbide it is advantageously added with nickel and / or molybdenum, also in a proportion of 3 to 12% by weight of the mixture.
  • Grade D tungsten carbide powder supplied, for example, by Murex, in Great Britain, having an average grain size of about 3.5 micrometers, is placed for 36 hours in a grinder having a metal grinding wheel hard, in the presence of a solvent such as decahydronaphthaline. 3 to 12% by weight of pulverized cobalt is then added to the tungsten carbide powder, and the mixture is then ground for a further 3 to 6 hours.
  • the very finely pulverized mixture thus obtained is then dried under vacuum, to remove the solvent, then mixed at 150 ° C. with a bonding agent composed of 80% by weight of a hard wax of the Fischer-Tropsch type and of 20% by weight of a partially saponnified wax.
  • a bonding agent composed of 80% by weight of a hard wax of the Fischer-Tropsch type and of 20% by weight of a partially saponnified wax.
  • This mixture is then passed three times in succession through an injection molding machine of the type which is commonly used in the plastics industry.
  • the first two passages are used to thoroughly mix the powder and the bonding agent.
  • the mixture is injected into the device of the Figure 4a which is maintained at a temperature of 100 ° C. A few seconds after this extrusion, the blank 74 can be removed from the molding device.
  • the next step is to remove the bonding agent and then sinter the blank.
  • the blank is heated to 450 ° C in an oven in the presence of a shielding gas or under vacuum.
  • the bonding wax is practically completely removed during this heating, by liquefaction and evaporation.
  • the blank can be placed on a support made of a material absorbing the bonding agent, for example a fiberglass sheet, or completely surround it with an absorbent substance, such as oxide powder. 'aluminum. This heating is carried out in a time of the order of a few hours which depends on the dimensions of the room.
  • the blank is placed in a sintering oven and heated under vacuum to remove the last remains of the bonding agent as well as the gases or water vapor which it could possibly have absorbed.
  • the blank is then heated to a temperature of 700 ° C. under vacuum, that is to say to a pressure of approximately 0.1 mbar, then to a temperature of 1,400 ° C. under an atmosphere. of argon at a pressure of 100 mbar.
  • the blank is kept at this temperature for about 30 minutes.
  • FIG. 5 illustrates a mold composed of two shells manufactured according to the method of the invention.
  • the shells 88.90 correspond respectively to the dies 26.44 shown in Figures 2a and 2b. When assembled, these shells define a cavity 92 having the shape and dimensions of the magnetic rotor illustrated in FIGS. 2a and 2b.
  • the magnetic disc 94 is first placed in the lower shell 90, and the mold is closed by placing the upper shell 88 in place.
  • the magnetic disc 94 is held in position automatically when the mold is closed by the shoulders 96 which correspond - in negative - to the recesses 22 of the housing 6 visible in Figures 2a and 2b.
  • the material chosen for the manufacture of the magnetic rotor is then injected into the mold, for example a plastic material, by means of at least one nozzle 98 produced at the intersection of the two shells 88.90 and composed of two channels such that the channel 85 visible in FIG. 4b.
  • the invention relates to the production of the mold itself and not to a particular method for manufacturing parts by injection. It is therefore not useful to detail here the materials and the operating conditions which can be chosen for the manufacture of these parts, these being selected from the known materials and operating conditions depending on the nature and the destination of these parts.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Powder Metallurgy (AREA)

Claims (9)

  1. Verfahren zum Herstellen einer Form, bestimmt zum Fertigen von Bauteilen sehr kleiner Abmessungen, die mindestens ein Motiv mit Abmessungen unterhalb eines Millimeters aufweisen, welche Form eine oder mehrere Formschalen (88, 90) umfaßt, die zusammenfügbar sind zum Begrenzen eines Hohlraums mit der Form und den Abmessungen des zu fertigenden Bauteils, welches Verfahren dadurch gekennzeichnet ist, daß das Herstellen der Form umfaßt:
    - spanabhebendes Herstellen, aus einem harten Material, einer Matrize (26, 44), von der mindestens ein Teil die Form eines Negativs der herzustellenden Formschale aufweist, welcher Teil Abmessungen besitzt, die etwas größer sind als die der herzustellenden Formschale,
    - Positionieren dieser Matrize in einem Hohlraum und Herstellen eines Rohlings (86) der Formschale durch Einspritzen eines Gemisches eines Pulvers, das mindestens ein metallisches Element umfaßt, und eines Bindemittels in den Hohlraum,
    - Austreiben des Bindemittels des Rohlings durch Erhitzen und Unterwerfen des Rohlings einer Frittierbehandlung.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Anteile an Bindemittel und Pulver in dem Gemisch für jede Formschale festgelegt werden in Abhängigkeit von den Abmessungsabweichungen zwischen der entsprechenden Matrize und dem zu fertigenden Bauteil.
  3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß für jede Formschale die entsprechende Matrize Abmessungen aufweist, die 5% bis 25% über denen der herzustellenden Formschale liegen.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das metallische Pulver aus Karbid von Wolfram und Kobalt besteht.
  5. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das metallische Pulver aus Karbid von Titan und Nickel und/oder Molybdän besteht.
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Bindemittel ein plastisches Material ist.
  7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß jede Matrize durch Abstechen erhalten wird.
  8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Matrizen aus Stahl hergestellt werden.
  9. Verfahren nach einem der Ansprüche 1 bis 8 für die Fertigung von Kleinteilen mittels Spritzguß, dadurch gekennzeichnet, daß mindestens eine Matrize mindestens ein Element in Form eines Fortsatzes aufweist, wobei jeder Fortsatz in der hergestellten Formschale einen Kanal (98) für das Spritzgießen der Kleinteile definiert.
EP88120579A 1987-12-16 1988-12-09 Verfahren zur Herstellung einer Form zum Herstellen sehr kleiner Formkörper Expired - Lifetime EP0320811B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8717695A FR2624770B1 (fr) 1987-12-16 1987-12-16 Procede de realisation d'un moule destine a la fabrication de pieces de tres petites dimensions
FR8717695 1987-12-16

Publications (2)

Publication Number Publication Date
EP0320811A1 EP0320811A1 (de) 1989-06-21
EP0320811B1 true EP0320811B1 (de) 1992-06-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP88120579A Expired - Lifetime EP0320811B1 (de) 1987-12-16 1988-12-09 Verfahren zur Herstellung einer Form zum Herstellen sehr kleiner Formkörper

Country Status (5)

Country Link
US (1) US4923672A (de)
EP (1) EP0320811B1 (de)
JP (1) JPH01268805A (de)
DE (1) DE3872364T2 (de)
FR (1) FR2624770B1 (de)

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Publication number Priority date Publication date Assignee Title
JP2730766B2 (ja) * 1989-08-08 1998-03-25 住友金属鉱山株式会社 射出成形粉末冶金製品の製造方法
ATA13194A (de) * 1994-01-25 1997-02-15 Gmundner Keramik Hohenberg Ges Verfahren zur herstellung von saugfähigen giessformen
US6224816B1 (en) * 1998-03-27 2001-05-01 3D Systems, Inc. Molding method, apparatus, and device including use of powder metal technology for forming a molding tool with thermal control elements
WO1999054075A1 (en) 1998-04-17 1999-10-28 The Penn State Research Foundation Powdered material rapid production tooling method and objects produced therefrom
CA2332798A1 (en) * 1998-05-19 1999-11-25 Jean-Marc Boechat Injection moulding tool and method for the production thereof
US6056915A (en) * 1998-10-21 2000-05-02 Alliedsignal Inc. Rapid manufacture of metal and ceramic tooling
DE19923870C2 (de) * 1999-05-25 2003-03-27 Vwm Vereinigte Werzeug Und Mas Verfahren zur Herstellung eines Spritzgußwerkzeuges
US6899838B2 (en) * 2002-07-12 2005-05-31 Becton, Dickinson And Company Method of forming a mold and molding a micro-device
US8033805B2 (en) 2007-11-27 2011-10-11 Kennametal Inc. Method and apparatus for cross-passageway pressing to produce cutting inserts
EP2579106A1 (de) 2011-10-04 2013-04-10 ETA SA Manufacture Horlogère Suisse Formung einer durchsichtigen Monoblock-Uhrenkomponente
EP3034210A3 (de) * 2012-10-16 2016-07-13 Cartier International AG Verfahren zur herstellung von uhrenteilen
CN107344236B (zh) * 2017-06-21 2019-06-14 徐州明润磁材有限公司 一种微型电机转子的制造方法
CN113146950B (zh) * 2021-03-11 2023-03-10 东泰精密塑胶科技(深圳)有限公司 一种注塑模具的装配方法

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Publication number Priority date Publication date Assignee Title
GB426600A (en) * 1933-09-06 1935-04-05 Siemens Ag A process for the production of sintered bodies
DE2558710C2 (de) * 1975-12-24 1978-01-05 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Verfahren zum Herstellen einer Preßform
US4431449A (en) * 1977-09-26 1984-02-14 Minnesota Mining And Manufacturing Company Infiltrated molded articles of spherical non-refractory metal powders
CH618904A5 (de) * 1978-02-10 1980-08-29 Claudio Balosetti
GB2024067B (en) * 1978-06-27 1982-06-09 Selly Oak Diecasting Ltd Die parts for pressure forming
US4526747A (en) * 1982-03-18 1985-07-02 Williams International Corporation Process for fabricating parts such as gas turbine compressors
EP0233478B1 (de) * 1986-01-17 1991-04-24 Mitsui Engineering and Shipbuilding Co, Ltd. Giessform, Verfahren zur ihrer Herstellung und Giessverfahren
US4657822A (en) * 1986-07-02 1987-04-14 The United States Of America As Represented By The Secretary Of The Navy Fabrication of hollow, cored, and composite shaped parts from selected alloy powders

Also Published As

Publication number Publication date
DE3872364T2 (de) 1993-01-21
DE3872364D1 (de) 1992-07-30
FR2624770A1 (fr) 1989-06-23
US4923672A (en) 1990-05-08
FR2624770B1 (fr) 1990-12-28
EP0320811A1 (de) 1989-06-21
JPH01268805A (ja) 1989-10-26

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