CN111036845A - Liquid-free formwork manufacturing method and system for investment precision casting - Google Patents
Liquid-free formwork manufacturing method and system for investment precision casting Download PDFInfo
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- CN111036845A CN111036845A CN202010010366.2A CN202010010366A CN111036845A CN 111036845 A CN111036845 A CN 111036845A CN 202010010366 A CN202010010366 A CN 202010010366A CN 111036845 A CN111036845 A CN 111036845A
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- ceramic
- formwork
- electric field
- powder
- mould
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- 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
- B22C9/04—Use of lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C23/00—Tools; Devices not mentioned before for moulding
- B22C23/02—Devices for coating moulds or cores
Abstract
The invention provides a method and a system for manufacturing a liquid-free formwork for investment precision casting, which comprises the following steps: an electric field increasing step: applying an electric field between the surface of the wax mould and the ceramic mould shell powder; the method comprises the following steps: adsorbing the ceramic mould shell powder on the surface of the wax mould according to the electric field force; the manufacturing steps inside the formwork: the interior of the formwork can be connected with the ceramic formwork powder according to the electrostatic acting force and the van der Waals force. The invention realizes the automatic deposition of ceramic powder on the surface of the wax mould by utilizing the electric field, has the characteristic of no liquid slurry, is easy to control the preparation process, has controllable and quick deposition speed and is easy to realize green manufacturing; the invention does not need to carry out airing treatment, and the shell manufacturing efficiency can be greatly improved.
Description
Technical Field
The invention relates to the technical field of formwork manufacturing, in particular to a liquid-free formwork manufacturing method and system for investment precision casting.
Background
The traditional mould shell preparation method is to place a wax mould in ceramic slurry mixed with a binder, and then prepare a surface layer and a subsequent back layer of the mould shell on the surface of the wax mould in a sand pouring mode, thereby forming the mould shell for investment casting. The method has the defects that the quality of the surface layer is difficult to control, the binding force between the surface layer and the back layer is weak, the quality defect of the formwork is easily caused, the defects of surface layer peeling or formwork cracking and the like are formed, and the quality of the casting is finally influenced. And the phenomena of coating dripping, serious dust pollution and the like are often caused in the preparation environment of the formwork due to the occurrence of liquid slurry and powder, so that the preparation method is not beneficial to the clean maintenance of a field and the health of an operator.
Patent document CN102277598B (application No. 201110200283.0) discloses a method for manufacturing a core mold for electroforming a horn-shaped micropore array, which comprises the steps of closely attaching a paraffin template to a conductive substrate, injecting a photoresist into micropores in the paraffin template, air-drying the photoresist to form a micro columnar array on the conductive substrate, heating and melting the upper end of each column in the micro columnar array, deforming the upper end of each column in the micro columnar array by the action of an electric field force of a strong electric field to form a horn-shaped mushroom structure with a straight wall-shaped lower end and an outward-expanded upper end, and cooling and hardening the mushroom-shaped structure to form the core mold for electroforming the horn-shaped micropore array.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to provide a method and system for manufacturing a liquid-free mold shell for investment casting.
The invention provides a method for manufacturing a liquid-free formwork for investment precision casting, which comprises the following steps:
an electric field increasing step: applying an electric field between the surface of the wax mould and the ceramic mould shell powder;
the method comprises the following steps: adsorbing the ceramic mould shell powder on the surface of the wax mould according to the electric field force;
the manufacturing steps inside the formwork: the interior of the formwork can be connected with the ceramic formwork powder according to the electrostatic acting force and the van der Waals force.
Preferably, a conductive film with the micron-sized thickness is coated on the surface of the wax material for investment precision casting by means of electrostatic spraying.
Preferably, the conductive film is a carbon film.
Preferably, the wax mould with the conductive film is used as a negative electrode, the ceramic mould shell powder is directionally transferred according to the electrostatic force between the positive electrode and the negative electrode, and the ceramic mould shell powder is adsorbed and deposited on the surface of the wax mould.
Preferably, the characteristics of the ceramic mould shell powder are changed, the ceramic mould shell powder is superposed for many times according to the electric field force, and is transferred and attached to the surface of the former layer of ceramic mould shell powder, and finally a mould shell layer is formed.
Preferably, the characteristics of the ceramic form shell powder include the composition and particle size of the ceramic form shell powder.
Preferably, the compactness, strength and air permeability of the die shell layer are adjusted according to the adjustment of the electric field intensity, the components and granularity of the ceramic die shell powder.
According to the present invention there is provided a liquid-free formwork manufacturing system for investment precision casting comprising:
an electric field module: applying an electric field between the surface of the wax mould and the ceramic mould shell powder;
formwork surface manufacturing module: adsorbing the ceramic mould shell powder on the surface of the wax mould according to the electric field force;
the mould shell internal manufacturing module: the interior of the formwork can be connected with the ceramic formwork powder according to the electrostatic acting force and the van der Waals force.
Preferably, a conductive film with micron-sized thickness is plated on the surface of the wax material for investment precision casting in an electrostatic spraying manner;
the conductive film is a carbon film;
and taking the wax mould with the conductive film as a negative electrode, and carrying out directional migration on the ceramic mould shell powder according to the electrostatic force between the positive electrode and the negative electrode, wherein the ceramic mould shell powder is adsorbed and deposited on the surface of the wax mould.
Preferably, the characteristics of the ceramic mould shell powder are changed, the ceramic mould shell powder is superposed for many times according to the electric field force, and is transferred and attached to the surface of the former layer of ceramic mould shell powder, and finally a mould shell layer is formed;
the characteristics of the ceramic mould shell powder comprise the components and the granularity of the ceramic mould shell powder;
and adjusting the compactness, strength and air permeability of the die shell layer according to the adjusted electric field intensity, the components and granularity of the ceramic die shell powder.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention realizes the automatic deposition of ceramic powder on the surface of the wax mould by utilizing the electric field, has the characteristic of no liquid slurry, is easy to control the preparation process, has controllable and quick deposition speed and is easy to realize green manufacturing;
2. according to the invention, after the preparation of the formwork surface layer, the drying treatment is not needed, the preparation of the back layer formwork is directly carried out, the drying treatment is also not needed in the preparation process of the back layer formwork, the required thickness of the formwork can be directly prepared according to the requirement until the preparation of the formwork is completed, and the shell manufacturing efficiency can be greatly improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of a formwork prepared by an electrostatic deposition method.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The invention provides a method for manufacturing a liquid-free formwork for investment precision casting, which comprises the following steps:
step 1, applying an electric field between the surface of a wax mould and ceramic mould shell powder;
step 2, the ceramic mould shell powder is uniformly and compactly adsorbed on the surface of the wax mould under the action of an electric field, and the ceramic mould shell powder is thickened layer by layer until the thickness requirement is met;
3, realizing the close connection of the ceramic powder inside the formwork under the action of static electricity and Van der Waals force, wherein the electric field strength, the ceramic particles and the shape influence the compactness, the strength and the air permeability of the formwork;
the whole process of the invention has no solvent, which is a green and environment-friendly process; the drying process in the traditional ceramic slurry preparation process is not needed, and the shell making efficiency can be greatly improved.
Example (b):
a, plating a conductive film with micron-sized thickness, such as a carbon film and the like, on the surface of a wax material for investment casting in an electrostatic spraying manner;
step B, taking the wax mould with the conductive film as a negative electrode, and realizing the directional migration of the micro charged ceramic particles by utilizing the electrostatic field force between the positive electrode and the negative electrode so as to realize the adsorption and deposition of the surface layer ceramic particles on the surface of the wax mould, as shown in figure I, a schematic diagram of a mould shell prepared by an electrostatic deposition method is shown;
and C, changing the components and the granularity of the ceramic powder under the action of an electric field, realizing the migration of the back layer ceramic powder under the action of the electric field and the attachment of the back layer ceramic powder to the surface of the front ceramic layer, continuously and repeatedly superposing, and simultaneously realizing the regulation and control of the parameters of the die shell such as the binding force of the die shell, the air permeability and the like by adjusting the parameters such as voltage, the components of the powder, the granularity and the like, and finally forming the required die shell layer.
And D, directly preparing the back layer formwork without airing after preparing the formwork surface layer. The back layer formwork preparation process does not need airing treatment, and the needed thickness of the formwork can be directly prepared according to the requirement until the formwork preparation is completed.
Those skilled in the art will appreciate that, in addition to implementing the systems, apparatus, and various modules thereof provided by the present invention in purely computer readable program code, the same procedures can be implemented entirely by logically programming method steps such that the systems, apparatus, and various modules thereof are provided in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system, the device and the modules thereof provided by the present invention can be considered as a hardware component, and the modules included in the system, the device and the modules thereof for implementing various programs can also be considered as structures in the hardware component; modules for performing various functions may also be considered to be both software programs for performing the methods and structures within hardware components.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A method of making a liquid-free mold shell for investment casting, comprising:
an electric field increasing step: applying an electric field between the surface of the wax mould and the ceramic mould shell powder;
the method comprises the following steps: adsorbing the ceramic mould shell powder on the surface of the wax mould according to the electric field force;
the manufacturing steps inside the formwork: the interior of the formwork can be connected with the ceramic formwork powder according to the electrostatic acting force and the van der Waals force.
2. The method of claim 1 wherein the surface of the investment casting wax is coated with a conductive film of micron thickness by electrostatic spraying.
3. The method of claim 2, wherein the conductive film is a carbon film.
4. The method according to claim 2, wherein the ceramic form is deposited on the surface of the wax pattern by an adsorption process, wherein the ceramic form is moved in a direction by an electrostatic force between the anode and the cathode, and the wax pattern with a conductive film is used as the cathode.
5. The method of claim 1, wherein the ceramic shell is applied by a plurality of overlapping, migration and attachment to the surface of the previous layer of ceramic shell, and finally forms a shell layer.
6. The method of claim 5, wherein the ceramic form shell properties include ceramic form shell composition and particle size.
7. The method of claim 6 wherein the die shell layer is densified, strengthened and air permeable by adjusting the electric field strength, composition and particle size of the ceramic die shell powder.
8. A liquid-free formwork manufacturing system for investment casting, comprising:
an electric field module: applying an electric field between the surface of the wax mould and the ceramic mould shell powder;
formwork surface manufacturing module: adsorbing the ceramic mould shell powder on the surface of the wax mould according to the electric field force;
the mould shell internal manufacturing module: the interior of the formwork can be connected with the ceramic formwork powder according to the electrostatic acting force and the van der Waals force.
9. The liquid-free formwork fabrication system for investment casting of claim 8, wherein the surface of the wax for investment casting is coated with a conductive film of micron thickness by electrostatic spraying;
the conductive film is a carbon film;
and taking the wax mould with the conductive film as a negative electrode, and carrying out directional migration on the ceramic mould shell powder according to the electrostatic force between the positive electrode and the negative electrode, wherein the ceramic mould shell powder is adsorbed and deposited on the surface of the wax mould.
10. The liquid-free formwork manufacturing system for investment precision casting according to claim 8, wherein the characteristics of the ceramic formwork powder are changed, the ceramic formwork powder is overlapped, migrated and attached to the surface of the former layer of ceramic formwork powder for a plurality of times according to the electric field force, and finally a formwork shell layer is formed;
the characteristics of the ceramic mould shell powder comprise the components and the granularity of the ceramic mould shell powder;
and adjusting the compactness, strength and air permeability of the die shell layer according to the adjusted electric field intensity, the components and granularity of the ceramic die shell powder.
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| CN202010010366.2A CN111036845B (en) | 2020-01-06 | 2020-01-06 | Method and system for manufacturing liquid-free shuttering for investment precision casting |
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| CN202010010366.2A CN111036845B (en) | 2020-01-06 | 2020-01-06 | Method and system for manufacturing liquid-free shuttering for investment precision casting |
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| CN111036845A true CN111036845A (en) | 2020-04-21 |
| CN111036845B CN111036845B (en) | 2023-09-29 |
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