EP3768447A1 - Procédé pour produire un moule servant à couler des matières en fusion ainsi que moule - Google Patents

Procédé pour produire un moule servant à couler des matières en fusion ainsi que moule

Info

Publication number
EP3768447A1
EP3768447A1 EP19712975.2A EP19712975A EP3768447A1 EP 3768447 A1 EP3768447 A1 EP 3768447A1 EP 19712975 A EP19712975 A EP 19712975A EP 3768447 A1 EP3768447 A1 EP 3768447A1
Authority
EP
European Patent Office
Prior art keywords
casting
mold
casting mold
support structure
wall
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.)
Pending
Application number
EP19712975.2A
Other languages
German (de)
English (en)
Inventor
Johannes Homa
Manfred SPITZBART
Dominik REICHARTZEDER
Peter Schneider
Bertram KAWLATH
Armin RAAB
Holger REICHENBAECHER
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.)
Lithoz GmbH
Schubert und Salzer Feinguss Lobenstein GmbH
Original Assignee
Lithoz GmbH
Schubert und Salzer Feinguss Lobenstein GmbH
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
Priority claimed from DE102018106725.9A external-priority patent/DE102018106725A1/de
Application filed by Lithoz GmbH, Schubert und Salzer Feinguss Lobenstein GmbH filed Critical Lithoz GmbH
Publication of EP3768447A1 publication Critical patent/EP3768447A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to a method for producing a casting mold, in particular a shell for filling melt and / or a core for producing a cavity in a casting, with a wall of a refractory and gas-permeable material, wherein the casting mold with a generative manufacturing process is established and a corresponding mold.
  • a casting mold for the metallic casting or precision casting of precision components wherein the essential part of the casting mold consists of a porous ceramic produced by an additive rapid prototyping process in the green or sintered state.
  • the structures corresponding to the mold cores or the structures to be surrounded by metal are produced by means of a generative rapid prototyping process.
  • the external shape of the mold can also be made.
  • cooling ducts are provided on or in the outside of the casting mold or risers are formed or external ribs which act as cooling passages are arranged.
  • support ribs can be provided, which are arranged on the side facing away from a cavity side.
  • the mold is backed with a pad of fine ceramic.
  • the bedding gives the comparatively thin mold produced by the generative rapid prototyping process the mechanical stability required for the casting.
  • a shell is provided in which the casting mold is inserted in order to be able to withstand the pressure during casting.
  • the disadvantage here is that the mold for receiving the bed must be taken in a container, so that the bed with loose Ceramic can support the mold sufficiently. In addition to additional material, this requires manual intervention and thus leads to a time-consuming and expensive procedure. The same applies to the alternative version with a shell. In addition, the heat dissipation of the freshly cast casting can not be affected as the puddle and shell further isolate the mold.
  • the object of the present invention is to provide a casting mold and a method for producing a casting mold, with which a casting mold can be produced largely automatically, which alone and without further measures can withstand the casting pressure and thus creates cost effectively and quickly
  • the heat generated during casting can be selectively removed, ie depending on the desired cooling duration of individual regions of the casting, and the quality of the casting can thus be increased.
  • a wall of a refractory and gas-permeable material for example ceramic
  • the casting mold is built using a generative manufacturing process.
  • Such generative manufacturing processes are, for example, 3-D printing processes in which liquid material is applied in layers and then cured.
  • the wall of the casting mold is formed with a support structure matched to the casting mold, which is formed by open and / or closed cavities and / or which provides different wall thicknesses in order to support the casting largely independently of form against the casting pressure and targeted thermal energy in the casting Melt to melt or melt dissipate.
  • the support structure which is preferably integrally connected to the wall of the mold, a stable mold is created, which is suitable to cast very precise castings.
  • this method of production enables a casting mold which can be produced largely automatically.
  • the automation takes place just before pouring the material into the mold. No further supporting measures are required, such as the filling of cavities with sand or other materials, since the casting itself is already sufficiently stable to be able to withstand the casting pressure.
  • the support structure also makes it possible to selectively hold or remove the heat of the melt during casting in order to obtain an optimally cooled cast piece.
  • the casting mold according to the invention is intended in particular for metallic, industrial investment casting.
  • a variety of molds are created, and it is particularly economical if these molds can be created quickly and automatically.
  • With the support structure the entire shape or only a part thereof can be produced. Simple shapes without a core or more complicated shapes with one or more cores (core-shell shapes) can be manufactured.
  • Wax models is connected to a casting unit. Then, this casting unit is dipped from wax into liquid ceramic and sanded. This process is repeated several times until a sufficiently thick and stable shell shape is created. The wax is then melted from the shell mold and the shell mold is fired. Only then can the casting of the part be continued.
  • the production of a wax model as well as the installation of a casting unit made of wax and the dipping and sanding to obtain the shell shape are eliminated.
  • the shell mold is created directly by the generative manufacturing process. Thus, either the casting mold alone or even the single casting mold is produced together with a sprue system and other casting molds which are connected to the sprue system.
  • the support structures are provided which, depending on requirements, can more or less stably support and stabilize the cavity. Due to the structured construction of the support structure, it is possible for the support structure to be made more stable in regions in which a higher casting pressure is to be expected, and to be made simpler and less stable in regions in which the casting pressure will be less severe becomes.
  • the production of the casting mold can also be carried out in a very economical manner, since the material input - and thus the production time, which in some way depends on the amount of walls and support structures to be produced by the generative process - is targeted to the present requirements can be coordinated.
  • the support structure can influence the cooling of the fresh casting. More cavities, in particular closed cavities, isolate the casting longer and more material of the support structure can accelerate heat dissipation. For example, a uniform cooling component can be created or individual areas of the casting can be kept warm longer.
  • a stress-free and void-free casting can thus be generated.
  • Open structures support heat dissipation.
  • Even cooling channels are conceivable, through which air is blown.
  • the design of the cooling channels exist in the present invention over conventional manufacturing great freedom.
  • Another advantage of the invention in comparison to a backfilled form as in DE 103 17 473 B3 is that the energy required to burn a backfilled mold is many times higher than in the case of a mold with a supporting structure. This has an impact on throughput times and production costs, especially in a series process.
  • a generative manufacturing process is a 3-D printing process with which the casting mold is built up in layers.
  • the generative production method is carried out in a slip-based manner, in particular as stereolithography, in digital light processing technology (DLP), as direct inkjet writing (DIW) or with slip-casting-based technology, for example in layers Slip deposition (LSD) or LIS.
  • DLP digital light processing technology
  • DIW direct inkjet writing
  • LSD layers Slip deposition
  • the mold can be produced in good quality, in particular with low roughness and with sufficient speed.
  • the support structure is arranged on the outside of the casting mold facing away from the later casting or the cavity, the cavity in which the casting is to be cast later is not influenced by the support structure according to the invention.
  • the production method according to the invention does not influence a particular design of the castings and is therefore universally applicable.
  • the support structure depends on the casting to be produced and the casting does not have to be adapted to the support structure.
  • the support structure of the later casting facing the inside to the later Guss published facing away from the outside of the mold coarser so an optimal design can be done with the least possible use of material of the support structure.
  • the coarser design of the support structure can be realized in particular with open and / or closed cavities that increase in size from the inside outwards. While small cavities are provided near the cavity, larger cavities are advantageous at a greater distance from the cavity. The support effect is thus generated optimally, without requiring a large amount of material for the support structure.
  • the heat dissipation can be specifically influenced by this design.
  • a grape-shaped pouring unit can be created correspondingly to the conventional wax-melting method, with which a large number of parts are produced by one casting. This too leads to an economical production process of the parts.
  • the very low roughness Rz is preferably less than 100 miti, which is generally sufficient to achieve a corresponding surface quality of the part.
  • the method according to the invention is particularly advantageously suitable for a precision casting process.
  • the casting mold can be produced and used particularly economically, since investment casting processes are generally used industrially and a relatively large number of individual castings is to be produced in a short time.
  • these industrially produced precision castings are also very sensitive in terms of price, so that the method according to the invention makes it possible to provide very cost-effective precision castings. If advantageously the casting mold is used for a single-crystal casting, then, for example, turbine blades can be produced very effectively.
  • the shape of the support structure is optimized for the expected during the casting process mechanical and / or thermal stress.
  • the wall thickness or cavities of the cast piece to be cast it can be effected that, for example, the solidification of the metal takes place uniformly.
  • the required wall thickness, arrangement and size of the individual elements, such as the ribs, is calculated and adapted to the requirements.
  • a casting mold according to the invention in particular a shell for filling melt and / or a core for producing a cavity in a casting, with a wall of a refractory and gas-permeable material, in particular ceramic, is constructed using a generative manufacturing process.
  • the wall of the casting mold has a support structure tailored to the casting mold, which is formed by open and / or closed cavities and / or by different wall thicknesses.
  • the support structure is provided in order to support the casting mold in a formally stable manner against the casting pressure and to specifically isolate heat energy in the melt or to remove it from the melt.
  • the support structure is provided. With the support structure, the entire shape or a part thereof may be formed. Simple shapes without a core or more complicated shapes with one or more cores (core-shell shapes) can be produced.
  • the support structure Due to the support structure, it is now possible that a mold is created, which can pour a very accurate part.
  • the casting mold does not change its shape due to the casting pressure of the melt, since the supporting structure is designed such that it supports the casting mold, in which the melt is filled, in such a way that it can not deform. It is with the erfindungsge- Thus, the casting mold allows a very precise casting mold and thus also the creation of a very precise casting.
  • the support structure also makes it possible to influence how the thermal energy in the melt can be isolated or removed from the melt. For a high-precision part, it is crucial that the heat energy of the melt is specifically dissipated. Thus, there may be areas in which it is advantageous if the heat is kept as long as possible and on the other hand, there will be areas where it is advantageous that the heat is dissipated as quickly as possible.
  • the casting mold according to the invention thus not only enables the production of a precise component, but also technically an outstanding influence on the heat dissipation in order to create an accurate and faultless casting.
  • the mold is a precision casting mold. Especially in fine casting, which is carried out industrially, a very precise production of the part is required.
  • the casting mold can therefore be used particularly advantageously in investment casting.
  • a negative mold of the piece to be cast is formed in the form of a cavity on the inside of the casting mold, and the support structure on the outside, ie on the cavity arranged away from the wall of the mold, so a mold can be created, which allows an independent of the design of the support structure of the mold part.
  • the supporting structure can be arranged independently of the cavity.
  • the mold is constructed in layers by means of 3-D printing. This allows a particularly large design freedom of the mold. Undercuts of the support structure are thus readily feasible.
  • the support structure or the structure for dissipating the heat or for holding the heat can thus be designed individually and particularly effectively for each casting mold.
  • the support structure is coarser from the inside to the outside of the mold. This means that increasingly larger cavities are provided, in particular from the inside to the outside of the casting mold. While in the region of the cavity advantageously small cavities or a large amount of material can cause support and heat conduction, it is usually sufficient if there are fewer support structures farther from the cavity and correspondingly larger cavities are provided. This can be done both by a corresponding design of the support structure itself and by a reduction of the wall thickness, so that a greater wall thickness is provided in the vicinity of the cavity and further away from the cavity a smaller wall thickness of the support structure is realized ,
  • the cavities are rounded off and / or angularly formed. Due to the generative manufacturing process there is a great deal of room for maneuver. So the hollow In order to bring about particularly high stability of the support structures, be formed rounded.
  • the angular configuration of the cavities may offer, if a simple construction of the support structure is desired.
  • the cavities may be configured in particular in the form of pores, ie spherical or irregularly shaped cavities, honeycombs and / or rectangular cavities. Depending on the requirements of the supporting force or the thermal conductivity, such a shape may prove to be particularly advantageous. Of course, other forms of cavities are possible and may have advantages for the corresponding mold.
  • the support structure is formed from the inside to the outside of the casting mold with thinner wall thicknesses. Thinner wall thicknesses are usually faster to produce, so that can be produced by such a design freedom even more cost-effective mold.
  • a very low roughness is a roughness Rz of less than 100 pm.
  • the wall thickness of the casting mold ie the complete wall with supporting structure or a single supporting wall of the supporting structure can be between 0.1 mm and 75 mm.
  • the single wall thickness of the support wall can be made very thin, for example with 0.1 mm, but may also have a wall thickness of several millimeters.
  • the entire wall thickness of the casting mold, including the support structure can also be many millimeters, up to 75 mm, depending on the size of the part to be cast.
  • the wall thickness is also to be suitable for establishing a connection with the sprue system, a higher wall thickness will be required.
  • the casting mold is a single crystal casting mold for casting single crystal castings.
  • turbine blades can be produced very effectively.
  • the mold is made with a slip-based generative manufacturing process.
  • the mold can be produced in good quality, in particular with low roughness and with sufficient speed. Further advantages of the invention are described in the following exemplary embodiments. It shows:
  • FIG. 1 shows a cross section through a system having a plurality of casting molds
  • Figure 2 shows a section of a wall with a diamond-shaped
  • Figure 3 shows a section of a wall with a cuboid
  • Figure 4 shows a section of a wall with a honeycomb-shaped
  • Figure 5 shows a section of a wall with a support structure with circular cavities
  • Figure 6 shows a section of a wall with a rib-shaped
  • FIG. 7 shows a casting mold with a core.
  • the same reference numerals are used for features that are identical and / or at least comparable in their design and / or mode of action. Unless these are explained in detail again, their design and / or mode of action corresponds to the design and mode of action of the features already described above.
  • the Angusssystem 1 has a funnel 2, which opens into a pouring tube 3. Starting from the pouring tube 3, a plurality of projections 4 which open into the cavity 5 of individual molds 6 extend. A melt, which is poured into the hopper 2, thus flows through the pouring tube 3 and into the cavity 5 via the inflow openings 4. There, the melt solidifies and forms a casting, which assumes the shape of the cavity 5.
  • shell mold 7 The combination of the sprue system 1 and the molds 6 is referred to as shell mold 7.
  • this shell mold 7 was produced by means of a wax model which was repeatedly immersed in liquid ceramics and in sand. Subsequently, this green shell mold 7 was dried and fired to form a solid shell mold 7 suitable for pouring with melt.
  • the molds 6 have walls 8 with a support structure 9, which were produced by a generative manufacturing process, for example 3-D printing.
  • the support structure 9 is illustrated in the illustration of FIG. 1 as a honeycomb hatching.
  • the support structures 9 extend here not only over the molds 6, but also via the sprue system 1 with funnel 2, sprue 3 and sprues 4.
  • the funnel 2 and / or the sprue 3 not with such a honeycomb structure or supporting structure 9, but was created in a conventional or other simple way.
  • the shell mold 7 is designed in such a way that several, in this case six, casting molds 6 are arranged on the sprue system 1 in the manner of a wagon. It is therefore possible that six casting parts are poured into the six cavities 5 simultaneously with one casting.
  • Each wall 8 has an inner side 10 and an outer side 11.
  • the inner side 10 is directed into the interior of the cavity 5, while the outer side 11 simultaneously forms the outer side of the shell mold 7.
  • Different structures of the walls 8 with support structures 9 are shown enlarged in the figures 2-6 corresponding to section A.
  • Figure 2 shows a section A of the wall 8 of the mold 6 with a support structure 9, in which closed flea spaces 12 are arranged.
  • the support structure 9 is constructed with a plurality of support walls 13.
  • the supporting walls 13 formed square flea spaces 12 of different sizes in cross section.
  • the Flohl hamper 12 are formed smaller in the vicinity of the inner side 10 than in the region of the outer side 11 of the wall eighth
  • the support walls 13 extend obliquely to the inside 10, so that the square flea spaces 12 with a point, diamond-shaped, to the inside 10 and outside 11 show.
  • the support structure 9 in the direction of the outer side 11 forms jagged, open flea spaces 15, it is smoothly closed in the region of the inner side 10 by an inner wall 14.
  • the inner wall 14 later forms the surface of the part which has been cast in the cavity 5. Accordingly, it is important that the inner wall 14 forms a surface texture with very little roughness in order to achieve the smoothest possible surface of the part.
  • the inner side 10 or inner wall 14 is therefore preferably with a Roughness of less than 100 miti formed.
  • FIG. 3 shows a further embodiment of a wall 8 of the casting mold corresponding to section A.
  • the support structure 9 of the wall 8 is formed here in cross-section by means of rectangular flea spaces 12 and 15. Most of the flea spaces are closed flea spaces 12. However, an open flea space 15 is also provided.
  • the support structure 9 may be suitable for causing the heat removal as quickly as possible. However, heat dissipation is delayed by a corresponding design, in particular by closed flea spaces, since the closed flea spaces 12 act as insulation rather than the open flea spaces 15.
  • the support walls 13 have different wall thicknesses W.
  • the wall thicknesses W of the support walls 13 can vary from preferably 0.1 mm to several millimeters, for example 5 or 6 mm.
  • the entire wall 8 may have a thickness of many millimeters, for example up to 75 mm. Especially when the wall 8 is to exert a particularly strong support effect or when the heat is particularly long ge in the cavity 5 is to be very strong walls 8 advantageous.
  • FIG. 4 shows a further possibility of an embodiment of a support structure 9 corresponding to detail A of FIG.
  • the support structure 9 has here honeycomb flea spaces 12 and 15. In addition to the closed flea spaces 12, open flea spaces 15 are also shown. The open cavities 15 point towards the outside 11.
  • the honeycomb flea spaces 12 are closed with the inner wall 14, so that a smooth surface of the inner surface 10 is formed in order to obtain a corresponding surface of the casting.
  • the honeycomb support structure 9 is particularly stable and easy to produce by the 3-D printing process.
  • FIG. 5 shows a further embodiment of the support structure 9 of the section A, in which the flea spaces 12 have a circular cross section. They can be spherical or cylindrical.
  • the support wall 13 has irregular thicknesses. It is located between the circular flea spaces 12.
  • the diameters of the circular F cavities 12 become larger from the inner side 10 to the outer side 11.
  • the arrangement may also be different, namely that larger flea spaces 12 are arranged in the area of the inside 10 than in the area of the outside. This also applies to all other embodiments.
  • the inner side 10 is closed with the inner wall 14.
  • the inner wall 14 may have a particularly low roughness. With regard to the supporting walls 13, this is not necessary. Flier a correspondingly greater roughness can be selected, in particular, if this is the Flergna the entire support structure 9 faster and easier to implement.
  • FIG. 6 shows a further embodiment of the section A with a corresponding support structure 9.
  • the support structure 9 has support walls 13 which protrude rib-like from the inner wall 14 in the direction of the outer side 11.
  • the support walls 13 in this embodiment have decreasing wall thicknesses W, so that they are wedge-shaped in cross-section. This can facilitate heat dissipation.
  • both closed cavities 12 and open cavities 15 can be provided.
  • the closed cavity 12 shown here is trapezoidal in cross-section and has rounded corners. This improves the stability of the support structures 9 and demonstrates that, depending on the strength requirements or requirements for heat dissipation, a largely arbitrary configuration of the support structure 9 is possible.
  • FIG. 7 shows an embodiment of the invention in which the casting mold 6 again has an inflow opening 4 into the cavity 5.
  • a core 16 is arranged in the cavity 5.
  • the core 16 can, as shown here, be integrated into the casting mold 6, that is to say in one piece with a shell 17 of the casting mold
  • the shell 17 as well as alternatively the core 16 or both shell 17 and core 16 can also be produced by the method according to the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

Procédé pour produire un moule (6), notamment une coque (7) pour couler des matières en fusion et/ou un noyau pour produire une cavité dans une pièce coulée. Ledit moule comprend une paroi (8) en un matériau réfractaire et perméable au gaz, le moule (6) étant structuré par un procédé de fabrication générative. Selon l'invention, la paroi (8) du moule (6) est conçue avec une structure d'appui (9) adaptée au moule, qui est formée par des cavités ouvertes et/ou fermées, et/ou avec des épaisseurs de paroi différentes pour que le moule soit supporté en grande partie indépendamment indéformable vis-à-vis de la pression de coulée et pour isoler de manière ciblée l'énergie calorifique dans la matière en fusion ou l'éliminer hors de la matière en fusion.
EP19712975.2A 2018-03-21 2019-03-20 Procédé pour produire un moule servant à couler des matières en fusion ainsi que moule Pending EP3768447A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102018106725.9A DE102018106725A1 (de) 2018-03-21 2018-03-21 Verfahren zur Herstellung einer Gussform zum Einfüllen von Schmelze sowie Gussform
DE102018115087 2018-06-22
PCT/EP2019/056987 WO2019180095A1 (fr) 2018-03-21 2019-03-20 Procédé pour produire un moule servant à couler des matières en fusion ainsi que moule

Publications (1)

Publication Number Publication Date
EP3768447A1 true EP3768447A1 (fr) 2021-01-27

Family

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Application Number Title Priority Date Filing Date
EP19712975.2A Pending EP3768447A1 (fr) 2018-03-21 2019-03-20 Procédé pour produire un moule servant à couler des matières en fusion ainsi que moule

Country Status (7)

Country Link
US (1) US20210031257A1 (fr)
EP (1) EP3768447A1 (fr)
JP (1) JP2021518271A (fr)
CN (1) CN112041102A (fr)
BR (1) BR112020019166A2 (fr)
CA (1) CA3094276A1 (fr)
WO (1) WO2019180095A1 (fr)

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DE102019219132A1 (de) * 2019-12-09 2021-06-10 Volkswagen Aktiengesellschaft Verfahren und Vorrichtung zur Herstellung eines Gusskerns und ein Verfahren zur Herstellung eines Gussteils sowie ein Kraftfahrzeug
CN113263135B (zh) * 2021-05-24 2023-02-17 沈阳铸造研究所有限公司 一种3d打印砂型的空间网格化打印方法
CN114799061A (zh) * 2022-03-21 2022-07-29 上海交通大学 熔模铸造模壳及其拼接方法
WO2024100643A1 (fr) * 2022-11-09 2024-05-16 Magnus Metal Ltd. Système et procédé de fonderie additive
WO2024100644A1 (fr) * 2022-11-09 2024-05-16 Magnus Metal Ltd. Système de moulage et procédé de fonderie additive

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CN105499492B (zh) * 2015-12-15 2017-08-11 清华大学 非密实结构新铸型
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Publication number Publication date
CN112041102A (zh) 2020-12-04
WO2019180095A1 (fr) 2019-09-26
CA3094276A1 (fr) 2019-09-26
JP2021518271A (ja) 2021-08-02
BR112020019166A2 (pt) 2021-01-05
US20210031257A1 (en) 2021-02-04

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