EP3616806A1 - Procédé de fabrication d'un lingot de noyau de moulage modèle, d'un noyau de moulage modèle et d'une moule de coulée fine ainsi qu'un procédé de coulée destiné à la fabrication d'une partie coulée dotée d'une structure creuse - Google Patents

Procédé de fabrication d'un lingot de noyau de moulage modèle, d'un noyau de moulage modèle et d'une moule de coulée fine ainsi qu'un procédé de coulée destiné à la fabrication d'une partie coulée dotée d'une structure creuse Download PDF

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Publication number
EP3616806A1
EP3616806A1 EP18192272.5A EP18192272A EP3616806A1 EP 3616806 A1 EP3616806 A1 EP 3616806A1 EP 18192272 A EP18192272 A EP 18192272A EP 3616806 A1 EP3616806 A1 EP 3616806A1
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EP
European Patent Office
Prior art keywords
model
core
lost
blank
ceramic
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.)
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Application number
EP18192272.5A
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German (de)
English (en)
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EP3616806B1 (fr
Inventor
Johannes Otto
Michael Otto
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Johannes and Michael Otto GbR Vertreten Durch Die Gesellschafter Johannes Otto und Michael Otto
Original Assignee
Johannes and Michael Otto GbR Vertreten Durch Die Gesellschafter Johannes Otto und Michael Otto
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Priority to ES18192272T priority Critical patent/ES2891542T3/es
Application filed by Johannes and Michael Otto GbR Vertreten Durch Die Gesellschafter Johannes Otto und Michael Otto filed Critical Johannes and Michael Otto GbR Vertreten Durch Die Gesellschafter Johannes Otto und Michael Otto
Priority to PT181922725T priority patent/PT3616806T/pt
Priority to EP18192272.5A priority patent/EP3616806B1/fr
Priority to PL18192272T priority patent/PL3616806T3/pl
Priority to US17/269,022 priority patent/US11607721B2/en
Priority to JP2021512901A priority patent/JP7100399B2/ja
Priority to PCT/EP2019/072308 priority patent/WO2020048774A1/fr
Publication of EP3616806A1 publication Critical patent/EP3616806A1/fr
Application granted granted Critical
Publication of EP3616806B1 publication Critical patent/EP3616806B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • 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

Definitions

  • the invention relates to a method for producing a model mold blank according to claim 1, a method for producing a model mold core according to claim 8, a method for producing an investment mold according to claim 12 and a casting method for producing a casting with a cavity structure according to claim 15.
  • Casting processes for the production of components are known from the prior art. In these, a mold is filled with a material and removed after it has solidified or solidified. The formation of undercuts and cavity structures in the component poses a particular challenge.
  • the model can be made of wax, for example, and can be used to create a ceramic mold.
  • the casting mold is in particular designed as a lost mold in the form of a single-use ceramic coating of the model. After the wax has been removed from the mold, a cavity remains which can be filled with the material of the component to be produced. After filling and curing, the mold is destroyed and the component removed.
  • cores are used around which the wax model is made. After removing the wax from the ceramic coating, these cores remain in the cavity of the ceramic coating and then accordingly also form a cavity in the component. The core is later removed from the component by mechanical or chemical methods.
  • WO 2015/051916 A1 describes a method in which a core is first produced in accordance with a 3D model in a first CNC method. The core is then positioned in a processing holder so that it can then be coated with a wax body blank. To a certain extent, it is a process for producing a model core blank.
  • the wax body blank is then processed in a second CNC process in such a way that a lost model of the component made of wax is created around the core.
  • the process can be described as a process for producing a model mold core.
  • the model mold core produced in this way thus has a lost core and the lost model.
  • a disadvantage of the methods for producing the model mold blank and the model mold core is that the position of the core relative to the lost model is not reliably achieved with sufficient precision. This creates rejects. The later the defective positioning of the core in the lost model, which is hardly noticeable from the outside, is recognized, the higher the costs of the committee. In the different Manufacturing stages therefore require considerable effort to prevent incorrect positioning of the cavity structures in the final component.
  • a disadvantage of this investment casting mold is that an expensive machining holder is required which can withstand later firing processes and metal casting. In addition, there may be an incorrect positioning of the lost core in the ceramic mold, which either renders the investment casting mold as such or the component subsequently cast unusable.
  • a disadvantage of this step is that the machining holder is exposed to the casting temperatures of the metal.
  • the machining holder can deform, so that the relative positioning between the ceramic shape and the core changes.
  • the processing holder must be made of high-temperature resistant materials, which makes it expensive and means increased effort when it is included in processing machines.
  • the object of the invention is therefore to develop process steps which contribute to a process-reliable, reproducible and, above all, precise positioning of a lost core relative to a ceramic form of an investment casting mold, the process steps being to be carried out as little as possible as quickly and inexpensively as possible. In particular, this should also prevent rejects from the core production to the finished component.
  • the invention relates to a method for producing a model mold core blank, which is particularly suitable for producing a cast part with a cavity structure, using a 3D model (three-dimensional model) of digital geometry coordinates of the cast part.
  • a ceramic blank is positioned on a machining holder and a fixation is established between the ceramic blank and the machining holder.
  • the cubature of the ceramic blank is preferably larger than a core element to be produced from it.
  • a core element is then produced, a lost core being produced from the ceramic blank based on the 3D model in a first CNC manufacturing process while the fixation continues, the machining holder being fixed in a CNC machine for carrying out the first CNC manufacturing process .
  • the lost core is preferably a cavity model of the cavity structure.
  • the method then provides for making a model blank by pouring model material around the lost core and allowing the model material to solidify while the fixation continues.
  • the cubature of the model blank is preferably larger than a lost model to be produced from it, the lost model preferably being a positive model of the cast part if the outer contour of the lost model is produced by a material-removing process such as turning, milling, laser cutting, etc.
  • the cubature of the model blank is preferably smaller than a lost model to be produced therefrom, the lost model preferably being a positive model of the cast part if the outer contour of the lost model is produced on the model blank by means of a material application process, for example 3D printing.
  • An advantage of the method according to the invention is that the lost core has a defined position relative to the machining holder. This avoids positioning problems that can otherwise arise from a subsequent fixing of an already produced core element with a lost core to a processing holder. Each time a core element is clamped in a machining holder, the core element may become deformed.
  • the alternative production of a fixation by gluing takes a long time and due to curing stresses in the glue, there can also be positional deviations between the core element and the Machining bracket come. Even small deviations in the area of the fixation can lead to larger position deviations apart from the fixation. All of this is avoided according to the invention.
  • the first CNC manufacturing process can be a cutting process, in particular a milling process, and / or a generative manufacturing process such as 3D printing, selective laser melting or sintering.
  • the preferred method is the milling process.
  • a 3D printing method can also be provided, in which a model material, e.g. Wax is printed on and / or around the lost core while the fixation continues.
  • a model material e.g. Wax
  • Such 3D printing processes allow particularly complex geometries. With such material-applying processes, either the model blank can be produced, or all or at least part of the outer contour of the lost model can be produced directly.
  • the machining holder is positioned in the CNC machine performing the execution of the first CNC manufacturing method and before the machining holder is fixed. This has the advantage that the machining holders can be connected to the ceramic blank outside the CNC machine. This reduces machine downtimes, especially when several machining holders have a uniform geometry.
  • the machining holder has a coupling piece for receiving in a zero-point fixing system, the coupling piece being received in a zero-point fixing system of the CNC machine performing the first CNC manufacturing process.
  • a zero-point fixing system is characterized in particular by the fact that no exact positioning has to be carried out when producing the fixing.
  • the coupling piece only has to be roughly positioned and the alignment of the coupling piece in the zero point fixing system then takes place automatically when fixing.
  • defined correlating positioning surfaces in particular, contribute to the correct positioning in a zero point fixing system, in particular both on the side of the coupling piece and on the side of the zero point fixing system.
  • Zero-point fixing systems in the sense of this document are to be understood as zero-point clamping systems and other holding mechanisms (adhesion, adhesive, negative pressure, etc.). Zero point clamping systems fix using clamping forces. Zero point clamping systems can also be combined with other holding mechanisms so that clamping and other holding forces are used for fixation.
  • the method can be supplemented by the fact that a stabilizing frame is produced from the ceramic blank during the first CNC manufacturing process and while the fixation continues, the stabilizing frame supporting the lost core, in particular at at least one support point which is arranged at a distance from the machining holder .
  • Such stabilizing frames allow very fine lost cores to be provided, which are neither deformed nor damaged during their own production or during subsequent production steps.
  • the stabilizing frame can be at least partially outside the model blank. In this area, he then disrupts further processing of the model blank relatively little.
  • removal of one or more support points between the stabilizing frame and the lost core is provided after the lost core has been produced and before the model blank has been produced, preferably in the first CNC production method.
  • the support points are preferably connecting webs, which are preferably narrower and / or thinner than the adjacent area of the lost core.
  • the stabilizing frame is removed after the production of the lost core and before the production of the model blank, preferably after the removal of one or more support points, and furthermore preferably in the first CNC production process. This is particularly suitable for lost cores that have sufficient inherent stability.
  • the stabilizing frame is not removed before the model blank is made.
  • the stabilizing frame can then support the lost core in the production of the model blank and optionally also in the production of the lost model.
  • the stabilizing frame can be at least partially arranged in the model blank. However, it should be outside the lost model. Bases of the stabilization frame can then extend through the lost model to the lost core. In this way, even unstable lost cores are stabilized during the further process steps, shape changes are avoided and damage is prevented.
  • a model wax is particularly suitable as a model material.
  • the model material should have a lower melting temperature than the core element.
  • a sprue model is formed when the model blank is produced.
  • Such a sprue model will later form a sprue in the ceramic investment casting mold during the production of a ceramic investment casting mold. At the same time, it can be used as an outlet for removing the lost model and / or the lost core.
  • the sprue model is optionally conical. This results in a funnel-shaped sprue.
  • the abbreviation CNC in this application stands for computer-aided numerical control or manufacturing steps, which in particular are automated with a computer.
  • the surfaces of the core element can optionally be coated using the first CNC manufacturing process. As a result, the surfaces can be particularly smooth.
  • the lost core can, for example, be arranged in a model mold and the model blank can be formed around the lost core by filling / injecting model material such as wax, thermoplastic or the like into the space between the lost core and the inner walls of the model mold.
  • model material such as wax, thermoplastic or the like
  • the ceramic blank can first be brought into the desired blank shape by injection molding, injection molding or casting, a suitable liquid of ceramic material.
  • the starting material may include one or more ceramic powders, a binder, and optionally additives that are incorporated into a correspondingly shaped blank mold can be brought in.
  • the blank mold can be removed, for example opened, to remove the green body.
  • the green body After the green body has been removed from the blank mold, it should be fired at high temperature in one or more steps to remove the volatile binder and to sinter and harden the ceramic green body. As a result, it achieves a strength and shape retention that are sufficient for use in the casting of metallic material such as, for example, a titanium, nickel or cobalt-based alloy.
  • the 3D model of the digital geometry coordinates of the cast part can be adapted as an introductory method step in order to take into account a correction of manufacturing-related deviations in shape due to, for example, shrinkage or material stresses.
  • the invention also includes a model core blank, which is produced by a method for producing a model core blank, as described above and below.
  • the advantages of the process are also inherent in the model mold core blank. In particular, it can be manufactured with high precision, is reliable and inexpensive.
  • the invention relates to a method for producing a model mold core, in which the method for producing a model mold core blank, as described above and below, is carried out, and to producing an outer contour of a lost model from and / or based on the model blank on the 3D model in a second CNC manufacturing process while the fixation continues, the machining holder being fixed in a CNC machine for performing the second CNC manufacturing process.
  • the lost core assumes a defined position on the machining holder and, subsequently, the lost model is also correctly positioned relative to the machining holder and thus also to the lost core.
  • the machining holder is preferably positioned before the second CNC manufacturing method is carried out and before the machining holder is fixed in the CNC machine that is to be carried out. Machining holders with a defined geometry can be positioned particularly easily, quickly and precisely in the CNC machine or machines that are carrying them out. While performing Process steps for which a CNC machine is not required can be released for this CNC machine and used for other purposes.
  • the machining holder has a coupling piece for receiving in a zero-point fixing system, the coupling piece being received in a zero-point fixing system of the CNC machine performing the second CNC manufacturing process. This enables the processing holder to be picked up particularly precisely and quickly in the CNC machine.
  • the first CNC manufacturing process is preferably an ablation process, more preferably a machining process, and particularly preferably a milling process.
  • the second CNC manufacturing process is preferably either an ablation process, more preferably a machining process, and particularly preferably a milling process, or an application process such as 3D printing.
  • the second CNC manufacturing process can also combine ablation and coating processes. This enables different areas of the lost model to be produced particularly efficiently.
  • the optional stabilization frame can be at least partially outside the lost model. Then, at least in part, it has no contour-influencing influence on the component to be produced later, which will be based in particular on the positive body of the lost model.
  • the subject matter of the invention also includes a model mold core which is produced by the method for producing a model mold core, as described above and below.
  • the advantages of the process are also inherent in the model mold core. In particular, it can be manufactured with high precision, is reliable and inexpensive.
  • the invention further relates to a method for producing an investment casting mold, in which the method for producing a model mold core, as described above and below, is carried out.
  • a ceramic shape is applied to the outer contour of the lost model and a positioning connection is formed ceramic shape with at least one connection point on the core element. Finally, the lost model is removed from the ceramic form.
  • the advantage of this is that the core element and the lost shape have a high relative positional accuracy to one another by means of the positioning connection.
  • the processing holder should have no direct connection to the ceramic shape. This means that it can be removed.
  • the positioning connection should be designed such that the removal of the machining holder has no influence on the relative positioning between the ceramic shape and the lost core.
  • an inexpensive machining holder can be used which does not have to be able to withstand either baking or sintering temperatures or casting temperatures during component production.
  • reusable machining holders can be used, in particular also those that consist at least in part or entirely of tool steel.
  • the method can optionally be supplemented by a step in which the fixation between the processing holder and the core element is removed and the core element is separated from the processing holder before or after the lost model is removed from the ceramic mold, i.e. in particular after the application of the ceramic mold or after the removal of the lost model from the ceramic mold, and particularly preferably before a casting process is carried out to produce the casting in the investment casting mold.
  • the ceramic shape can be applied to the outer contour of the lost model, for example, by repeated immersion in a ceramic slip, with excess slip flowing off after each immersion, sanding with ceramic stucco and air drying. In this way, several ceramic layers can be built up, which form the ceramic shape on the outer contour in the manner of a molded shell.
  • the resulting arrangement can then be fed to a steam autoclave in order to remove the lost model, so that the ceramic mold with the lost core arranged therein remains as the investment casting mold.
  • the method can be supplemented by the optional step of firing the arrangement comprising the core element and the ceramic shape before or after separating the core element from the machining holder. This removes volatile binder and sinters and hardens the assembly. As a result, the investment casting mold thus created reaches one Strength and shape retention that are sufficient for use in casting metallic material such as a titanium, nickel or cobalt based alloy.
  • a sprue model is also formed from the model blank, in particular from the model blank.
  • This step can include the complete working out of the sprue model from the model blank or, if provided, the post-processing of a coarser sprue model already formed on the model blank.
  • Such a sprue model will later form a sprue in the ceramic investment casting mold during the production of a ceramic investment casting mold.
  • the sprue can be used as an outlet for removing the lost model and / or the lost core.
  • the sprue model is optionally conical. This results in a funnel-shaped sprue.
  • the subject matter of the invention also includes an investment casting mold, which is produced by the method for producing an investment casting mold, as described above and below.
  • the advantages of the process are also inherent in the investment casting mold. In particular, it can be produced with high precision, is reliable and inexpensive, in particular the lost core is correctly positioned and held in the ceramic shape. Gating structures and ventilation structures for the casting process can then be attached to the investment casting mold. Alternatively, separate sprue structures and ventilation structures for the later casting process can also be attached to the lost model, so that these are subsequently connected to the investment mold or are part of it.
  • the invention also relates to a casting process for producing a casting with a cavity structure, in which a process for producing an investment casting mold as described above and below is carried out, and in which a casting of molten metal into the ceramic mold around the lost core , a solidification of the molten metal into a solid component, and a removal of the ceramic shape and the lost core from the solid component.
  • the fixed component has cavity structures that are positioned very precisely in the fixed component, so that, for example, there are no weak points that could render the fixed component unusable.
  • the lost core is removed in particular from the cavity structure of the component.
  • the lost core is preferably removed from the solid component by water-based or chemical washing or other techniques. If that Core element still has an optional stabilizing frame, so this is removed from the fixed component.
  • the casting method preferably includes the optional step of removing the fixation between the machining holder and the core element and separating the core element from the machining holder at the latest before the molten metal is poured into the ceramic mold.
  • an inexpensive machining holder can be used, which at least does not have to withstand the casting temperatures of the molten metal.
  • the casting process is particularly suitable when the molten metal is a titanium, nickel or cobalt-based alloy. With such expensive components, high costs can be achieved through the process-related reduction of rejects and component damage.
  • the investment casting mold is preheated before casting the molten metal. This can have a positive effect on crystal formation and prevent cracks in the investment casting due to thermal stresses caused by sudden temperature changes.
  • the molten metal preferably solidifies polycrystalline, and particularly preferably single crystal. This ensures high component strength.
  • the 1 to 7 show a possible chronological sequence of procedural results after performing various procedural steps.
  • Technical features that have reference numerals for which explanations have already been made in a previous figure are in some cases not described again. Rather, the preceding parts of the description apply accordingly.
  • a ceramic core blank 10 which is fixed to a machining holder 50 via a two-sided fixation 51.
  • the fixation 51 can be formed, for example, by gluing or clamping.
  • the two sides of the fixation 51 lie opposite one another and the ceramic core blank 10 is arranged between the two sides.
  • the processing holder 50 has a coupling piece 52 and a processing bridge 53.
  • the processing bridge 53 extends between the two sides of the fixation 51 and is connected to the coupling piece 52 or is formed in one piece therewith.
  • the coupling piece 52 is designed for reception in a zero-point fixing system of CNC processing machines.
  • the cubature of the ceramic core blank 10 is preselected or prefabricated such that a core element 11 to be produced from the ceramic core blank 10 by material removal or removal with a lost core 12 lies within this cubature.
  • Fig. 2 is a possible result of the initial situation Fig. 1 shown after or during the production of the core element 11, the lost core 12 from the ceramic blank 10 (see Fig. 1 ) is manufactured according to a 3D model in a first CNC manufacturing process, for example a CNC milling process, while the fixation 51 continues.
  • a (temporary) stabilizing frame 15 is made from the ceramic blank 10 (see Fig. 1 ) manufactured in the first CNC manufacturing process while the fixation 51 continues.
  • the (temporary) stabilization frame 15 supports the lost core 12 via bases 16.
  • the support points 16 are each spaced from the fixation 51.
  • the support points 16 are connecting webs or pins, which are each narrower than the adjacent area of the lost core 12.
  • the machining holder 50 is fixed for the implementation of the first CNC manufacturing method with the coupling piece 52 in a CNC machine.
  • the lost core 12 of the core element 11 which extends between the two sides of the fixation 51.
  • the stabilizing frame 15 was removed after the lost core 12 had been produced, in particular after the support points 16 had been removed.
  • the ceramic core blank 10 In the area of the fixation 51, the ceramic core blank 10 (see Fig. 1 ) not processed in order not to weaken the fixation 51 and not to damage the processing holder 50. This unprocessed area of the ceramic core blank 10 (see Fig. 1 ) can also be called the fixing area. Even at this stage, the core element 11 also has two connection points 13, to which a ceramic shape 81 will later appear (see Fig. 7 ) will connect.
  • Fig. 4 the order is after Fig. 3 further used in such a way that the lost core 12 continues to be fixed to the processing holder 50 via the fixation 51 and in a model mold 30 for producing a model blank 20 (see Fig. 5 ) is arranged.
  • the model mold 30 has a first and a second mold half 31, 32 and is supported via positioning surfaces 33 on the machining holder 50, in particular on the coupling piece 52 and on the machining bridge 53.
  • the core element 11 protrudes through openings from the Model mold 30 out.
  • a tool cavity 35 is formed around the lost core 11.
  • a model sprue 34 which is formed by the model molding tool 30, opens into this tool cavity 35 from above.
  • the after Fig. 4 The starting situation shown is suitable for now producing a model blank 20 (see Fig. 5 ) by casting the model material through the model gate 34 into the tool cavity 35, in particular thus around the lost core 12 lying in the tool cavity 35.
  • the model material can, for example, be a model wax.
  • the model material should have a lower melting temperature than the core element 11.
  • the model material is left then freeze.
  • the fixation 51 still exists.
  • the lost core 12 is positioned in a defined position relative to the model blank 20.
  • the cubatures of the model blank 20 and the tool cavity 35 are each larger than a lost model 21 to be produced therefrom (see Fig. 6 ).
  • Fig. 5 After removal of the model mold 30 according to the state of the process Fig. 4 the arrangement remains according to Fig. 5 , In Fig. 5 one can see how the core element 11 with the lost core 12 is still fixed on the processing holder 50 via the fixation 51. However, the lost core 12 is now additionally arranged in the model blank 20 made of the model material. This results in a model mold core blank 1. Corresponding to the model gate 34 of the model mold 30, there is also a gating point 24 due to the manufacture remaining on the model blank 20.
  • a conical sprue model 23 can also be seen through the model blank 20.
  • the lost core 12 therefore still assumes a defined position on the machining holder 50 and, as a result, the lost model 21 is also correctly positioned relative to the machining holder 50 and thus also to the lost core 12.
  • the lost core 12 forms, together with the lost model 21, a model mold core 2.
  • the second CNC manufacturing process is an ablation process, preferably a machining process, and particularly preferably a milling process.
  • the outer contour 22 of the lost model 21 is in it Areas by a material-applying process, for example in a (CNC) 3D printing process.
  • the model mold core 2 namely the lost model 21 and the lost core 12 arranged therein, can be separated from the processing holder 50, because the goal of arranging the lost core 12 exactly in the lost model 21 has been achieved and will not be negatively influenced in the next steps .
  • the fixation 51 is how to Fig. 7 can recognize in particular that the lost core 12 is separated from the fixing area.
  • the fixing area can remain on the processing holder 50. The fixing area can be removed from this later if necessary.
  • Fig. 7 also shows how the lost model 21 and the lost core 12 are encased by a ceramic mold 81 of an investment casting mold 80. Only the ends of the lost core 12 look out of the ceramic shape 81.
  • the ceramic shape 81 was applied to the outer contour 22 of the lost model 21 according to the method.
  • the ceramic mold 81 can be applied to the outer contour 22 of the lost model 21, for example, by repeated immersion in a ceramic slip, excess slip flowing off after each immersion, sanding with ceramic stucco and air drying. In this way, several ceramic layers can be built up, which form the ceramic shape 81 in the manner of a molded shell on the outer contour 22.
  • a positioning connection 82 of the ceramic mold 81 is produced with the two connection points 13 on the core element 11, so that the lost core 12 is firmly connected to the ceramic mold 81.
  • the lost core 12 with the connection points 13 protrudes from the lost model 21.
  • the model mold core 2 can be held on these protrusions during the production of the ceramic mold 81, the connection points 13 should be kept free.
  • sprue and / or ventilation structure parts can be attached to the lost model 21 before the application of the ceramic mold 81. These are then preferably connected to the ceramic mold 81 when it is applied.
  • a sprue 83 which is part of the ceramic shape 81, was also evidently formed using the sprue model 23.
  • the lost model 21 can be removed from the ceramic mold 81, for example by melting it out, the melted model material being able to run through the sprue 83.
  • the arrangement according to Fig. 7 for example, a steam autoclave to remove the lost model 21.
  • the ceramic mold 81 with the lost core 12 arranged therein remains as the investment casting mold 80.
  • the investment casting mold 80 is not yet sufficiently stable for the subsequent process steps, it can first be fired.
  • the casting process can be prepared and carried out.
  • the preparation usually involves a change of work location and positioning in a casting device.
  • the investment mold 80 is preheated before casting. According to the method, this is followed by pouring molten metal through the sprue 83 into the ceramic mold 81 and around the lost core 12.
  • the molten metal can be, for example, a titanium, nickel or cobalt-based alloy.
  • the ceramic mold 81 and the lost core 12 can be removed from the fixed component 102, in particular in a destructive manner.
  • the ceramic form is typically broken open and / or milled.
  • the lost core 12 can be dissolved, for example, by chemical reactions, for example water-soluble or otherwise dissolved, and then runs out of the remaining cavity structures 101 in the solid component 102.
  • a casting 100 as in Fig. 8 which has a fixed component 101 and a cavity structure 102 in the fixed component 101.
  • the lost model 21 is therefore a positive model of the cast part 100 and the lost core 12 is a model of the cavity structure 101.
  • the geometries to be generated in the manufacturing process are based on the geometry data of the later casting 100.
  • the geometries to be generated can be determined by using a 3D model of digital geometry coordinates of the casting 100. If necessary, the geometries to be generated are adapted to the digital geometry coordinates of the casting 100. In this way, shrinkage, component stresses and the like can be taken into account in order to finally obtain a physical casting 100, the shape of which corresponds to the 3D model of digital geometry coordinates of the casting 100.
  • a stabilizing frame 15 with support points 16 over the state of the process Fig. 2 maintain.
  • the stabilizing frame 15 can then support the lost core 12 also in the production of the model blank 20 and optionally also in the production of the lost model 21.
  • the stabilizing frame 15 can be at least partially arranged in the model blank 20. However, it can also be at least partially outside the model blank 20. However, the stabilizing frame 15 should be arranged outside the lost model 21. Bases 16 of the stabilizing frame 15 can then project through the lost model 21 to the lost core 12. In this way, even unstable lost cores 12 are stabilized during the further process steps.
  • Model mold core blank 32 second mold half 2 Model mold core 33 Positioning surface 34 Model gate 10 Ceramic blank 35 Tool cavity 11 Core element 12th lost core 50 Machining holder 13 Connection point 51 Fixation 15 Stabilization frame 52 Coupling piece 16 base 53 Machining bridge 20th Model blank 80 Investment casting mold 21 lost model 81 ceramic shape 22 Outer contour 82 positioning connection 23 Sprue model 83 Sprue 24 Gate 100 Casting 30 Model molding tool 101 Cavity structure 31 first half of the mold 102 solid component

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  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP18192272.5A 2018-09-03 2018-09-03 Procédé de fabrication d'un lingot de noyau de moulage modèle, d'un noyau de moulage modèle et d'une moule de coulée fine ainsi qu'un procédé de coulée destiné à la fabrication d'une partie coulée dotée d'une structure creuse Active EP3616806B1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
PT181922725T PT3616806T (pt) 2018-09-03 2018-09-03 Procedimentos para fabrico de uma pré-forma de núcleo de molde de maqueta, de um núcleo de molde de maqueta e de um molde de fundição de precisão, bem como um processo de fundição para fabrico de uma peça fundida com uma estrutura oca
EP18192272.5A EP3616806B1 (fr) 2018-09-03 2018-09-03 Procédé de fabrication d'un lingot de noyau de moulage modèle, d'un noyau de moulage modèle et d'une moule de coulée fine ainsi qu'un procédé de coulée destiné à la fabrication d'une partie coulée dotée d'une structure creuse
PL18192272T PL3616806T3 (pl) 2018-09-03 2018-09-03 Sposób wytwarzania półfabrykatu na rdzeń formy modelu, rdzenia formy modelu oraz formy do odlewania precyzyjnego, jak również sposób odlewania służący do wytwarzania odlewu o strukturze drążonej
ES18192272T ES2891542T3 (es) 2018-09-03 2018-09-03 Procedimiento para la fabricación de una pieza en bruto de núcleo de molde de modelo, de un núcleo de molde de modelo y de un molde de fundición de precisión, así como un procedimiento de fundición para la fabricación de una pieza fundida con una estructura de cavidad
US17/269,022 US11607721B2 (en) 2018-09-03 2019-08-20 Method for producing a model mold core blank and a precision casting mold, and a casting method for producing a cast part having a void structure
JP2021512901A JP7100399B2 (ja) 2018-09-03 2019-08-20 モデルモールドコアブランク、モデルモールドコア、および精密鋳型を作製するための方法、ならびに空隙構造を有する鋳造部品を作製するための鋳造方法
PCT/EP2019/072308 WO2020048774A1 (fr) 2018-09-03 2019-08-20 Procédé destiné à la fabrication d'une ébauche de noyau de moule de modèle, d'un noyau de moule de modèle et d'un moule de précision ainsi que procédé de coulée destiné à la fabrication d'une pièce coulée à l'aide d'une structure creuse

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EP18192272.5A EP3616806B1 (fr) 2018-09-03 2018-09-03 Procédé de fabrication d'un lingot de noyau de moulage modèle, d'un noyau de moulage modèle et d'une moule de coulée fine ainsi qu'un procédé de coulée destiné à la fabrication d'une partie coulée dotée d'une structure creuse

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EP3616806A1 true EP3616806A1 (fr) 2020-03-04
EP3616806B1 EP3616806B1 (fr) 2021-07-28

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US (1) US11607721B2 (fr)
EP (1) EP3616806B1 (fr)
JP (1) JP7100399B2 (fr)
ES (1) ES2891542T3 (fr)
PL (1) PL3616806T3 (fr)
PT (1) PT3616806T (fr)
WO (1) WO2020048774A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11607721B2 (en) 2018-09-03 2023-03-21 Johannes + Michael Otto Gbr Method for producing a model mold core blank and a precision casting mold, and a casting method for producing a cast part having a void structure

Citations (4)

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Publication number Priority date Publication date Assignee Title
WO2015051916A1 (fr) 2013-10-11 2015-04-16 Flc Flowcastings Gmbh Procédé de moulage de précision de pièces creuses
CN105945220B (zh) * 2016-05-25 2017-11-17 东方电气集团东方汽轮机有限公司 一种带陶瓷型芯蜡模成型方法
EP3251790A2 (fr) * 2016-05-12 2017-12-06 Rolls-Royce plc Procédé permettant de fournir un dispositif de fixation d'un article en céramique, procédé d'usinage d'un article en céramique et procédé de coulée de précision à l'aide d'un article en céramique
US20180147622A1 (en) * 2016-11-29 2018-05-31 Jy'nove Process for producing a ceramic casting core

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Publication number Priority date Publication date Assignee Title
JP6717736B2 (ja) 2016-11-28 2020-07-01 ファナック株式会社 レーザ加工システム
PT3616806T (pt) 2018-09-03 2021-09-29 Johannes Michael Otto Gbr Vertreten Durch Die Ges Johannes Otto Und Michael Otto Procedimentos para fabrico de uma pré-forma de núcleo de molde de maqueta, de um núcleo de molde de maqueta e de um molde de fundição de precisão, bem como um processo de fundição para fabrico de uma peça fundida com uma estrutura oca

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015051916A1 (fr) 2013-10-11 2015-04-16 Flc Flowcastings Gmbh Procédé de moulage de précision de pièces creuses
EP3251790A2 (fr) * 2016-05-12 2017-12-06 Rolls-Royce plc Procédé permettant de fournir un dispositif de fixation d'un article en céramique, procédé d'usinage d'un article en céramique et procédé de coulée de précision à l'aide d'un article en céramique
CN105945220B (zh) * 2016-05-25 2017-11-17 东方电气集团东方汽轮机有限公司 一种带陶瓷型芯蜡模成型方法
US20180147622A1 (en) * 2016-11-29 2018-05-31 Jy'nove Process for producing a ceramic casting core

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11607721B2 (en) 2018-09-03 2023-03-21 Johannes + Michael Otto Gbr Method for producing a model mold core blank and a precision casting mold, and a casting method for producing a cast part having a void structure

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JP7100399B2 (ja) 2022-07-13
ES2891542T3 (es) 2022-01-28
PL3616806T3 (pl) 2021-12-20
PT3616806T (pt) 2021-09-29
US11607721B2 (en) 2023-03-21
US20210323049A1 (en) 2021-10-21
EP3616806B1 (fr) 2021-07-28
JP2021535840A (ja) 2021-12-23
WO2020048774A1 (fr) 2020-03-12

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