CN110711845B - Ceramic core, preparation method of ceramic core and preparation method of casting - Google Patents
Ceramic core, preparation method of ceramic core and preparation method of casting Download PDFInfo
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- CN110711845B CN110711845B CN201911049195.8A CN201911049195A CN110711845B CN 110711845 B CN110711845 B CN 110711845B CN 201911049195 A CN201911049195 A CN 201911049195A CN 110711845 B CN110711845 B CN 110711845B
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- 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
- B22C9/103—Multipart cores
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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
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- 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
- B22C9/108—Installation of cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
Abstract
The invention discloses a ceramic core, a preparation method of the ceramic core and a preparation method of a casting. According to the ceramic core, the inner cavity of the core outer sleeve is matched with the outer wall surface of the core inner cylinder to form the core cavity, and the outer wall surface of the core outer sleeve forms a ceramic core surface for forming a complex hollow cavity. Therefore, when the ceramic core is prepared, the positioning core matched with the cavity in the core jacket is prepared by the soluble core slurry and is positioned in the compression molding process of the core jacket, so that the ceramic core surface is prevented from deforming in the compression molding process of the core jacket, and the shape of the ceramic core surface is ensured to be the same as that of the complex hollow cavity of the casting.
Description
Technical Field
The invention relates to the technical field of precision casting, in particular to a ceramic core and a preparation method of the ceramic core, and further relates to a preparation method of a casting.
Background
At present, in the precision casting industry, for preparing a casting with a hollow cavity, a ceramic core is embedded in the wax pressing process, and the ceramic core is removed after the casting is molded by casting to form the hollow cavity of the casting. However, for a complicated hollow cavity, the ceramic core surface of the ceramic core used for hollow cavity molding is easy to deform in the processes of compression molding and demolding, and the temperature field around the casting is difficult to control in the casting pouring molding process, so that after the casting is poured, holes exist in the casting, the surface of the casting is notched, and the quality of the casting does not meet the requirement.
Disclosure of Invention
The invention provides a ceramic core, a preparation method of the ceramic core and a preparation method of a casting, and aims to solve the technical problems that the ceramic core surface of the existing ceramic core is easy to deform in the processes of compression molding and demoulding, and the temperature field around the casting is difficult to control in the process of casting molding.
According to one aspect of the invention, the ceramic core is used for forming a complex hollow cavity of a casting, the ceramic core is formed by splicing a core inner cylinder and a core outer sleeve, an inner cavity of the core outer sleeve is matched with an outer wall surface of the core inner cylinder to form a core cavity, the outer wall surface of the core outer sleeve forms a ceramic core surface for forming the complex hollow cavity, and a window communicated with the core cavity is arranged on the outer wall surface of the core outer sleeve.
Further, the core overcoat overlap joint is on the core inner tube, and the overlap joint designs for matched with stair structure.
Further, the wall thickness difference between the core outer sleeve and the core inner cylinder is not more than 2mm, so that the biscuit of the core outer sleeve and the biscuit of the core inner cylinder are placed in the same bowl and sintered simultaneously and generate the same shrinkage rate.
Furthermore, the window is arranged on the outer wall surface of the core outer sleeve in a protruding shape, so that the casting wax mold is firmly attached to the outer wall of the core outer sleeve.
According to another aspect of the present invention, there is also provided a method for preparing the ceramic core, comprising the steps of: designing a positioning core made of soluble core slurry and used for matching with the cavity in the core jacket to position the core jacket in the compression molding process according to the shape of the cavity in the core jacket; designing a core outer sleeve mold, a core inner barrel mold and a positioning core mold according to the shapes of the core outer sleeve, the core inner barrel and the positioning core respectively; injecting the soluble core slurry into a positioning core mold for compression molding to obtain a positioning core; after the positioning core is placed in a core sleeve mold for positioning, ceramic core slurry is injected into the core sleeve mold for compression molding to obtain a core sleeve with the positioning core embedded in a cavity, and a biscuit of the core sleeve is obtained after the positioning core is dissolved; injecting the ceramic core slurry into a core inner barrel mould for compression molding to obtain a biscuit of the core inner barrel; sintering and molding the biscuit of the core outer sleeve and the biscuit of the core inner cylinder to obtain the core outer sleeve and the core inner cylinder; and matching and splicing the core outer sleeve and the core inner cylinder to obtain the ceramic core.
Further, before designing and positioning the core, the method also comprises the following steps: the shapes of the core outer sleeve and the core inner cylinder are designed according to the overall shape of the ceramic core so as to determine the positions of the splicing surfaces of the core outer sleeve and the core inner cylinder, the splicing surfaces are positioned at the thicker part of the wall thickness of the ceramic core, and the molded surface where the spliced part is positioned corresponds to the molded surface of the casting to be processed.
Furthermore, after the core outer sleeve and the core inner cylinder are matched and spliced, a gap of 0.3mm-0.6mm is formed at the splicing part of the core outer sleeve and the core inner cylinder, and ceramic glue is filled in the gap, so that the core outer sleeve and the core inner cylinder are glued and fixed.
Further, the core outer sleeve and the core inner barrel are fixed in a gluing mode, and the method comprises the following steps: preparing an assembling clamp, wherein the assembling clamp comprises a positioning shaft inserted into the core inner cylinder, a gland bush sleeved on the positioning shaft and pressed on the core outer sleeve, and a threaded sleeve pressed on the gland bush and in threaded matching connection with the positioning shaft; sleeving the core inner cylinder on the positioning shaft, and coating ceramic glue on a splicing surface of the core inner cylinder for gluing with the core outer sleeve; the core outer sleeve and the core inner cylinder are spliced, and the gland is compressed through the threaded sleeve, so that the core outer sleeve and the core inner cylinder are mutually extruded and glued, and the core outer sleeve and the core inner cylinder are glued and fixed.
According to another aspect of the invention, a method for preparing a casting is also provided, wherein the method for preparing the casting adopts the ceramic core, and comprises the following steps: placing the ceramic core in a casting wax mold, injecting wax liquid into the casting wax mold for pressing and forming to obtain an integral wax mold combining the casting wax mold and the ceramic core into a whole; coating, sanding and molding are carried out on the integral wax mold, and the casting wax mold is removed and sintered and molded to obtain a casting ceramic mold; according to the requirement of controlling a casting temperature field, temperature adjusting materials for adjusting the temperature are injected into the cavity of the core from the window on the core outer sleeve, and the window is sealed through ceramic plugging; injecting molten metal into the casting ceramic mold, and taking a central cavity of the core inner cylinder as a water runner; and after the casting is formed, removing the ceramic core to obtain the casting with the complex hollow cavity.
Furthermore, the ceramic core is placed in the casting wax mold, and the ejector pins distributed along the circumferential direction on the casting wax mold are abutted against the core outer sleeve so as to adjust the coaxiality of the ceramic core and the casting wax mold.
The invention has the following beneficial effects:
the ceramic core is formed by matching and splicing a core inner cylinder and a core outer sleeve, the inner cavity of the core outer sleeve is matched with the outer wall surface of the core inner cylinder to form a core cavity, and the outer wall surface of the core outer sleeve forms a ceramic core surface for forming a complex hollow cavity, so that when the ceramic core is prepared, a positioning core matched with the inner cavity of the core outer sleeve is prepared by soluble core slurry, the positioning core is further positioned in a mould of the core outer sleeve in the compression forming process of the core outer sleeve, the ceramic core surface is prevented from deforming in the compression forming process of the core outer sleeve, the shape of the ceramic core surface is ensured to be the same as that of the complex hollow cavity of a casting, a window communicated with the core cavity is arranged on the outer wall surface of the core outer sleeve, and a temperature adjusting material for adjusting the temperature is injected into the core cavity from the window according to the requirement of the temperature control of the casting before the casting is poured, and the window is tightly sealed through ceramic blocking, so that cavities are formed inside the casting and gaps are prevented from being formed on the surface of the casting when the casting is molded by casting, and the quality of the casting is ensured to meet the requirement.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of a ceramic core according to a preferred embodiment of the present invention;
FIG. 2 is a schematic view of the construction of the core wrap and positioning core of the preferred embodiment of the present invention;
FIG. 3 is a flow chart of a method of making a ceramic core according to a preferred embodiment of the present invention;
FIG. 4 is a schematic structural view of a splicing fixture according to a preferred embodiment of the present invention;
fig. 5 is a schematic structural view of a wax pattern for castings according to a preferred embodiment of the present invention.
Illustration of the drawings:
1. a mold core outer sleeve; 2. a core inner barrel; 3. a core cavity; 4. positioning the mold core; 5. positioning the shaft; 6. a gland; 7. a threaded sleeve; 8. and (5) casting wax molds.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
FIG. 1 is a schematic structural view of a ceramic core according to a preferred embodiment of the present invention; FIG. 2 is a schematic view of the construction of the core wrap and positioning core of the preferred embodiment of the present invention; FIG. 3 is a flow chart of a method of making a ceramic core according to a preferred embodiment of the present invention; FIG. 4 is a schematic structural view of a splicing fixture according to a preferred embodiment of the present invention; fig. 5 is a schematic structural view of a wax pattern for castings according to a preferred embodiment of the present invention.
As shown in fig. 1, the ceramic core of the present embodiment is used for forming a complex hollow cavity of a casting, the ceramic core is formed by splicing a core inner cylinder 2 and a core outer sleeve 1, an internal cavity of the core outer sleeve 1 is matched with an outer wall surface of the core inner cylinder 2 to form a core cavity 3, the outer wall surface of the core outer sleeve 1 forms a ceramic core surface for forming the complex hollow cavity, and a window communicated with the core cavity 3 is arranged on the outer wall surface of the core outer sleeve 1. The ceramic core is formed by matching and splicing a core inner cylinder 2 and a core outer sleeve 1, the inner cavity of the core outer sleeve 1 is matched with the outer wall surface of the core inner cylinder 2 to form a core cavity 3, and the outer wall surface of the core outer sleeve 1 forms a ceramic core surface for forming a complex hollow cavity, so that when the ceramic core is prepared, a positioning core 4 matched with the inner cavity of the core outer sleeve 1 is prepared by soluble core slurry, and then the positioning core 4 is positioned in a mould of the core outer sleeve 1 in the compression forming process of the core outer sleeve 1 to avoid the deformation of the ceramic core surface in the compression forming process of the core outer sleeve 1, ensure that the shape of the ceramic core surface is the same as that of the complex hollow cavity of a casting, and the outer wall surface of the core outer sleeve 1 is provided with a window communicated with the core cavity 3, before the casting is poured, according to the requirement of casting temperature control, temperature adjusting materials for adjusting temperature are injected into the core cavity 3 from the window, and the window is sealed through ceramic blocking, so that cavities are prevented from being formed inside the casting and gaps are prevented from being formed on the surface of the casting during casting molding of the casting, and the quality of the casting is ensured to meet requirements.
As shown in fig. 1, the core outer sleeve 1 is lapped on the core inner cylinder 2, and the lapping part is designed into a matched step structure. Thereby increasing the splicing area of the core outer sleeve 1 and the core inner cylinder 2 and preventing wax materials and metal solution from entering the core cavity 3 when the casting wax mold 8 is formed and the casting is cast.
As shown in figure 1, the wall thickness of the core outer sleeve 1 and the core inner cylinder 2 is different by no more than 2mm, so that the biscuit of the core outer sleeve 1 and the biscuit of the core inner cylinder 2 are placed in the same bowl and sintered simultaneously and generate the same shrinkage rate. The wall thickness of core overcoat 1 and core inner tube 2 equals, the biscuit of core overcoat 1 and the biscuit sintering of core inner tube 2 are fashioned temperature parameter and time parameter homogeneous phase, the biscuit of core overcoat 1 and the biscuit of core inner tube 2 are arranged in with the burn pot and are sintered simultaneously and accomplish to improve the uniformity of core overcoat 1 and core inner tube 2, ensure that the size of core overcoat 1 and core inner tube 2 after the sintering shaping is accurate, and then make the cooperation splice the ceramic core's that becomes accurate in size.
As shown in fig. 1, the joint of the core inner cylinder 2 and the core outer sleeve 1 is located on the end surfaces of the two ends of the ceramic core, and the end surfaces of the two ends of the ceramic core are used for corresponding to the processing molded surface of the casting. Because the processing molded surface of the casting needs to be processed, when the processing molded surface of the formed casting is uneven at the joint of the core inner cylinder 2 and the core outer sleeve 1, the processing molded surface is flat.
As shown in fig. 1, the window is provided in a convex shape on the outer wall surface of the core housing 1. In one aspect, the core is positioned in the casting overmold through the bulge-like windows after dewaxing. On the other hand, the convex window is a channel for communicating the core cavity 3 with the outside, the window is covered by wax when a casting ceramic mold is prepared, the wax covered on the window is removed after the casting ceramic mold is prepared, then the temperature adjusting material for adjusting the temperature is injected into the core cavity 3 from the window, and the window is blocked by refractory mortar to prevent the temperature adjusting material from leaking.
As shown in fig. 2 and 3, the method for manufacturing a ceramic core according to the present embodiment, for manufacturing the ceramic core, includes the steps of: designing a positioning core 4 made of soluble core slurry for matching with the cavity inside the core sleeve 1 to position the core sleeve 1 in the compression molding process according to the shape of the cavity inside the core sleeve 1; designing a core outer sleeve mold, a core inner barrel mold and a positioning core mold according to the shapes of the core outer sleeve 1, the core inner barrel 2, the positioning core 4 and the casting respectively; injecting the soluble core slurry into a positioning core mold for compression molding to obtain a positioning core 4; after the positioning core 4 is placed in a core sleeve mold for positioning, ceramic core slurry is injected into the core sleeve mold for compression molding to obtain a core sleeve 1 with the positioning core 4 embedded in a cavity, and a biscuit of the core sleeve 1 is obtained by dissolving the positioning core 4; injecting the ceramic core slurry into a core inner cylinder mould for compression molding to obtain a biscuit of the core inner cylinder 2; sintering and molding the biscuit of the core outer sleeve 1 and the biscuit of the core inner cylinder 2 to obtain the core outer sleeve 1 and the core inner cylinder 2; and matching and splicing the core outer sleeve 1 and the core inner cylinder 2 to obtain the ceramic core. Wherein, the press forming of the positioning core 4: and (3) placing the positioning core mold in a heating plate at 45 ℃ to heat for more than half an hour, placing the positioning core mold into a material pressing machine to press the positioning core 4 when the temperature of the positioning core mold reaches 40 ℃, keeping the material pressing temperature at 85 ℃, and taking out the positioning core mold after maintaining the pressure for 30 seconds. And (3) press forming of the core outer sleeve 1: arrange core overcoat mould in more than half an hour of heating on 45 degrees centigrade's the hot plate, when the temperature of location core mould reached 40 degrees centigrade, arrange core overcoat mould in with location core 4, be equipped with the center pin that is used for going on fixing a position 4 axial of core and be used for carrying out the location boss of fixing a position 4's angular in the core overcoat mould, arrange core overcoat mould in the swager with core overcoat 1 press forming, press material temperature 98 degrees centigrade, take out after pressurize 10 seconds.
Before designing the positioning core 4, the method also comprises the following steps: the shapes of the core outer sleeve 1 and the core inner cylinder 2 are designed according to the overall shape of the ceramic core so as to determine the positions of the splicing surfaces of the core outer sleeve 1 and the core inner cylinder 2, the splicing surfaces are positioned at the thicker part of the wall thickness of the ceramic core, and the molded surface where the spliced part is positioned corresponds to the molded surface to be processed of the casting. If the shape of the core cavity of the ceramic core is complex and has a negative angle or an inner cavity, after the core jacket 1 is designed according to the overall shape of the ceramic core, a plurality of positioning cores 4 are designed to be respectively matched with a plurality of parts of the cavity of the core jacket 1 according to the shape of the inner cavity of the core jacket 1 so as to position the core jacket 1 in the compression molding process.
As shown in fig. 4, after the core outer sleeve 1 and the core inner cylinder 2 are matched and spliced, a gap of 0.3mm-0.6mm is arranged at the splicing position of the core outer sleeve 1 and the core inner cylinder 2, and ceramic glue is filled in the gap, so that the core outer sleeve 1 and the core inner cylinder 2 are fixed in a gluing way.
As shown in fig. 4, the core outer sleeve 1 and the core inner barrel 2 are fixed by gluing, and the method comprises the following steps: preparing an assembling clamp, wherein the assembling clamp comprises a positioning shaft 5 inserted into the core inner cylinder 2, a gland 6 sleeved on the positioning shaft 5 and pressed on the core outer sleeve 1, and a thread sleeve 7 pressed on the gland 6 and in thread matching connection with the positioning shaft 5; sleeving the core inner cylinder 2 on the positioning shaft 5, and coating ceramic glue on a splicing surface of the core inner cylinder 2 for gluing with the core outer sleeve 1; and splicing the core outer sleeve 1 and the core inner cylinder 2, and pressing the gland 6 through the threaded sleeve 7, so that the core outer sleeve 1 and the core inner cylinder 2 are mutually extruded and glued, and the core outer sleeve 1 and the core inner cylinder 2 are glued and fixed.
As shown in fig. 5, the method for producing a casting according to the present embodiment includes the steps of: placing the ceramic core in a casting wax mold 8, injecting wax liquid into the casting wax mold 8 for pressing and forming to obtain an integral wax mold combining the casting wax mold 8 and the ceramic core into a whole; coating, sanding and molding are carried out on the integral wax mold, and the casting wax mold 8 is removed and sintered and molded to obtain a casting ceramic mold; according to the requirement of controlling a casting temperature field, temperature adjusting materials for adjusting the temperature are injected into the core cavity 3 from the window on the core outer sleeve 1, and the window is sealed through ceramic plugging; injecting molten metal into the casting ceramic mold, and taking the central cavity of the core inner cylinder 2 as a water runner; and after the casting is formed, removing the ceramic core to obtain the casting with the complex hollow cavity. Optionally, if the temperature of the casting temperature field needs to be increased, filling heat preservation particles into the core cavity 3; if the temperature of the casting temperature field needs to be adjusted to be low, the cold iron balls or cold air are filled into the core cavity 3. Optionally, after the window is sealed by the ceramic plug, the ceramic plug and the window are sealed by refractory mortar and air-dried.
As shown in fig. 5, the ceramic core is placed in the casting wax mold 8, and the thimble distributed along the circumference of the casting wax mold 8 is pressed against the core housing 1, so as to adjust the coaxiality of the ceramic core and the casting wax mold 8. And after the casting wax mold 8 is formed, taking out the ejector pins, removing the casting wax mold 8 from the casting wax mold 8, and filling and scraping holes formed by the ejector pins on the wax mold by adopting high-temperature wax at 100 ℃. Alternatively, by injecting wax into the core cavity 3 from the window to prevent slurry from entering the core cavity 3 when making a shell by coating, and welding a wax-removing rod at the window, after coating, sanding, and molding on the integral wax pattern, the wax in the core cavity 3 is removed by the wax-removing rod. Optionally, wax of the pouring channel wax is poured from the central cavity of the core inner cylinder 2 to the two ends of the ceramic core and is pressed to form, so that the two ends of the ceramic core are sealed to form the pouring channel of the casting wax mold 8.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The preparation method of the ceramic core is characterized in that the ceramic core is prepared by splicing a core inner cylinder (2) and a core outer sleeve (1), a cavity inside the core outer sleeve (1) is matched with the outer wall surface of the core inner cylinder (2) to form a core cavity (3), the outer wall surface of the core outer sleeve (1) forms a ceramic core surface for forming a complex hollow cavity, a window communicated with the core cavity (3) is arranged on the outer wall surface of the core outer sleeve (1),
the preparation method comprises the following steps:
designing a positioning core (4) made of soluble core slurry according to the shape of the cavity inside the core sleeve (1) and used for matching with the cavity inside the core sleeve (1) to position the core sleeve (1) in the compression molding process;
designing a core outer sleeve mold, a core inner cylinder mold and a positioning core mold according to the shapes of the core outer sleeve (1), the core inner cylinder (2) and the positioning core (4) respectively;
injecting soluble core slurry into the positioning core mold for compression molding to obtain the positioning core (4);
placing the positioning core (4) in the core jacket mold for positioning, injecting ceramic core slurry into the core jacket mold for compression molding to obtain the core jacket (1) with the positioning core (4) embedded in a cavity, and dissolving the positioning core (4) to obtain a biscuit of the core jacket (1);
injecting the ceramic core slurry into a core inner cylinder mould for compression molding to obtain a biscuit of the core inner cylinder (2);
sintering and molding the biscuit of the core outer sleeve (1) and the biscuit of the core inner cylinder (2) to obtain the core outer sleeve (1) and the core inner cylinder (2);
matching and splicing the core outer sleeve (1) and the core inner cylinder (2) to obtain a ceramic core;
after the core outer sleeve (1) and the core inner cylinder (2) are matched and spliced, a gap of 0.3-0.6 mm is formed at the splicing position of the core outer sleeve (1) and the core inner cylinder (2), and ceramic glue is filled in the gap, so that the core outer sleeve (1) and the core inner cylinder (2) are glued and fixed;
the core outer sleeve (1) and the core inner barrel (2) are fixed in a gluing mode, and the method comprises the following steps:
preparing an assembling clamp, wherein the assembling clamp comprises a positioning shaft (5) inserted into the core inner cylinder (2), a gland (6) sleeved on the positioning shaft (5) and pressed on the core outer sleeve (1), and a threaded sleeve (7) pressed on the gland (6) and in threaded matching connection with the positioning shaft (5);
sleeving the core inner cylinder (2) on the positioning shaft (5), and coating ceramic glue on a splicing surface, which is used for being glued with the core outer sleeve (1), on the core inner cylinder (2);
splicing the core outer sleeve (1) and the core inner cylinder (2), and pressing the gland (6) through the thread sleeve (7) so as to extrude and glue the core outer sleeve (1) and the core inner cylinder (2) mutually, thereby cementing and fixing the core outer sleeve (1) and the core inner cylinder (2).
2. The method of making a ceramic core according to claim 1, further comprising, prior to designing the positioning core, the steps of:
the shapes of the core outer sleeve (1) and the core inner cylinder (2) are designed according to the overall shape of the ceramic core so as to determine the positions of the splicing surfaces of the core outer sleeve (1) and the core inner cylinder (2), the splicing surfaces are positioned at the thicker part of the wall thickness of the ceramic core, and the molded surface where the spliced part is positioned corresponds to the molded surface of the casting to be processed.
3. The method of making a ceramic core according to claim 1,
the mold core outer sleeve (1) is lapped on the mold core inner cylinder (2), and the lapping part is designed into a matched step structure.
4. The method of making a ceramic core according to claim 1,
the wall thickness difference between the core outer sleeve (1) and the core inner cylinder (2) is not more than 2mm, so that the biscuit of the core outer sleeve (1) and the biscuit of the core inner cylinder (2) are placed in the same bowl and sintered simultaneously and generate the same shrinkage rate.
5. The method of making a ceramic core according to claim 1,
the window is arranged on the outer wall surface of the core jacket (1) in a convex shape.
6. The preparation method of the casting is characterized in that a ceramic core is adopted and is formed by splicing a core inner cylinder (2) and a core outer sleeve (1), a cavity inside the core outer sleeve (1) is matched with the outer wall surface of the core inner cylinder (2) to form a core cavity (3), the outer wall surface of the core outer sleeve (1) forms a ceramic core surface for forming a complex hollow cavity, and a window communicated with the core cavity (3) is arranged on the outer wall surface of the core outer sleeve (1), and the preparation method comprises the following steps:
placing the ceramic core into a casting wax mold (8) mold, injecting wax liquid into the casting wax mold (8) mold, and performing compression molding to obtain an integral wax mold integrating the casting wax mold (8) and the ceramic core;
coating, sanding and molding are carried out on the integral wax mold, and the casting wax mold (8) is removed and sintered for molding to obtain a casting ceramic mold;
according to the requirement of casting temperature field control, temperature adjusting materials for adjusting temperature are injected into the core cavity (3) from a window on the core outer sleeve (1), and the window is sealed through ceramic plugging;
injecting molten metal into a casting ceramic mold, and taking a central cavity of the core inner cylinder (2) as a water runner;
and after the casting is formed, removing the ceramic core to obtain the casting with the complex hollow cavity.
7. A method of producing a casting according to claim 6,
the ceramic core is placed in a casting wax mold (8) mold, and ejector pins distributed along the circumferential direction on the casting wax mold (8) mold are abutted against the core outer sleeve (1) so as to adjust the coaxiality of the ceramic core and the casting wax mold (8) mold.
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| CN114871386B (en) * | 2022-07-07 | 2022-10-28 | 中国航发北京航空材料研究院 | Tool for reverse-inclination resin sand core combination and combination assembly method thereof |
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| US5295530A (en) * | 1992-02-18 | 1994-03-22 | General Motors Corporation | Single-cast, high-temperature, thin wall structures and methods of making the same |
| CN100333857C (en) * | 2005-11-29 | 2007-08-29 | 辽宁省轻工科学研究院 | Methd for preparing core of hollow ceramic |
| CN105014017B (en) * | 2015-07-14 | 2018-07-10 | 中国科学院金属研究所 | A kind of labyrinth ceramic core group technology |
| CN205270751U (en) * | 2015-11-17 | 2016-06-01 | 沈阳明禾石英制品有限责任公司 | A inlay combination formula ceramic core for making combustion engine blade foundry goods |
| CN105855472A (en) * | 2016-04-26 | 2016-08-17 | 东方电气集团东方汽轮机有限公司 | Manufacturing method for hollow ceramic core |
| CN108484140A (en) * | 2018-03-01 | 2018-09-04 | 辽宁航安特铸材料有限公司 | The ceramic layered core of two-component |
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