CN117047042A - Casting method of inner cavity structure casting - Google Patents
Casting method of inner cavity structure casting Download PDFInfo
- Publication number
- CN117047042A CN117047042A CN202311085064.1A CN202311085064A CN117047042A CN 117047042 A CN117047042 A CN 117047042A CN 202311085064 A CN202311085064 A CN 202311085064A CN 117047042 A CN117047042 A CN 117047042A
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- CN
- China
- Prior art keywords
- casting
- chaplet
- core
- sand
- main body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005266 casting Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000004576 sand Substances 0.000 claims abstract description 38
- 238000000465 moulding Methods 0.000 claims abstract description 13
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 239000011449 brick Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000007547 defect Effects 0.000 abstract description 4
- 239000002893 slag Substances 0.000 abstract description 3
- 230000004927 fusion Effects 0.000 abstract description 2
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007528 sand casting Methods 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C21/00—Flasks; Accessories therefor
- B22C21/12—Accessories
- B22C21/14—Accessories for reinforcing or securing moulding materials or cores, e.g. gaggers, chaplets, pins, bars
-
- 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
Abstract
The application relates to a casting method of an inner cavity structure casting, which comprises the following steps: supporting a sand core with a plurality of chaplets, wherein the sand core is used for forming the inner cavity structure; the chaplet comprises a chaplet main body and a supporting rod arranged at one end of the chaplet main body; the casting method comprises the following steps: modeling, wherein a positioning groove is formed in the inclined surface of the die, the core support main body sleeved with the core support sleeve is arranged in the positioning groove, and the supporting rod is positioned outside the positioning groove; placing the mold in a drag flask, and molding the sand to form a drag mold; the mould is lifted, and the supporting rod is pre-buried in the lower sand mould; removing the chaplet sleeve, wherein the chaplet main body is positioned in a cavity of the lower sand mold; the core supporting main body props against the inclined surface of the sand core; and (5) cleaning the support rod exposed out of the surface of the casting after mold closing, pouring and mold breaking. The casting method of the inner cavity structure casting disclosed by the application realizes the accurate positioning and limiting of the chaplet at the inclined plane, and effectively prevents the defects of slag inclusion, poor fusion and the like.
Description
Technical Field
The application relates to the technical field of casting, in particular to a casting method of a casting with an inner cavity structure.
Background
Core support is typically used to ensure proper placement of the sand core in the cavity during casting when the sand core is not able to maintain its proper position. When the casting process is designed, a plurality of areas are divided on the sand mold and/or the sand core according to the casting characteristics, and the core support is arranged in the range of each area so as to support the sand core and prevent the sand core from shifting and damaging. In the casting process, the chaplet and the high-temperature molten iron are melted into a whole to become a part of the casting.
For a thick and large-section casting with an inner cavity structure, the inner cavity structure of the casting is complex, a plurality of inner cavity sand cores are designed in a region needing to be divided, and basically each sand core needs to be supported by a core support. The bottoms of some sand cores are key parts of castings, so that the bottoms cannot be provided with chaplets in order to ensure the casting quality of the key parts, but the chaplets are arranged at other parts, and the defects of poor shape, thin skin, meat deficiency and the like of the castings, which are caused by inaccurate chaplet positioning and limiting and insufficient supporting force, are easily caused by sand core shifting.
Disclosure of Invention
Based on the technical problem that the core is difficult to set up by the sand core with the key part at the bottom of the needle, the casting method of the inner cavity structure casting with the core support stably set up at the inclined plane is provided.
In order to solve the problems, the application adopts the following technical scheme:
the embodiment of the application discloses a casting method of an inner cavity structure casting, which uses a plurality of chaplet to support a sand core, wherein the sand core is used for forming the inner cavity structure; the chaplet comprises a chaplet main body and a supporting rod arranged at one end of the chaplet main body;
the casting method comprises the following steps:
modeling, wherein a positioning groove is formed in the inclined surface of the die, the core support main body sleeved with the core support sleeve is arranged in the positioning groove, and the supporting rod is positioned outside the positioning groove; placing the mold in a drag flask, and molding the sand to form a drag mold; the support rod is buried in the lower sand mold;
after the die is pulled out, the core support sleeve is removed, and the core support main body is positioned in the cavity of the lower sand mold;
the core supporting main body props against the inclined surface of the sand core;
and (5) cleaning the support rod exposed out of the surface of the casting after mold closing, pouring and mold breaking.
In one embodiment, the surface of the chaplet main body is provided with an outer spiral structure, an inner spiral structure matched with the outer spiral structure is arranged in the chaplet sleeve, and the outer spiral structure is in limit fit with the inner spiral structure.
In one embodiment, a plurality of fluxing holes are uniformly arranged on the outer spiral structure at intervals.
In one embodiment, one end of the supporting rod, which is away from the chaplet main body, is provided with a sand hanging piece, and the cross-sectional area of the sand hanging piece is larger than that of the supporting rod.
In one embodiment, the end of the supporting rod facing the chaplet main body is provided with a cleaning groove.
In one embodiment, the bottom of the positioning groove is provided with a magnetic component.
In one embodiment, after the molding step, the chaplet body is placed in the positioning groove, a living material is placed in a gap between the chaplet body and the positioning groove and clamped.
In one embodiment, the casting method further comprises the step of applying a coating to the lower sand mold surface prior to removal of the core sleeve.
In one embodiment, refractory bricks are laid at positions, corresponding to the chaplet, of any of the sand cores.
The technical scheme adopted by the application can achieve the following beneficial effects:
according to the casting method of the inner cavity structure casting disclosed by the embodiment of the application, the chaplet is arranged at the inclined plane of the side surface of the sand core, and the locating groove arranged on the die and the supporting rod arranged at the other end of the chaplet main body are matched, so that the accurate locating and limiting of the chaplet at the inclined plane are realized, and even if the chaplet is not arranged at the bottom of the sand core, the side chaplet can provide enough supporting force to prevent the sand core from shifting, and the casting quality is effectively improved.
According to the casting method of the inner cavity structure casting disclosed by the embodiment of the application, the core support main body is sleeved with the core support sleeve to protect the core support main body, and the core support sleeve is removed after molding is finished, so that the friction and collision between the die and the core support are effectively prevented from damaging the core support and the die; and prevent the slag inclusion and poor fusion caused by sand bonding of the core support main body in the molding process.
Drawings
FIG. 1 is a schematic cross-sectional view of a drag flask after molding;
FIG. 2 is an enlarged view of part A of FIG. 1;
FIG. 3 is a schematic cross-sectional view of the mold flask after mold-close pouring;
FIG. 4 is an enlarged view of part B of bitmap 3;
FIG. 5 is a schematic structural view of a chaplet;
reference numerals illustrate:
110-lower sand mould, 120-upper sand mould, 130-sand core and 131-refractory brick;
210-supporting rods, 220-core support bodies, 221-external spiral structures, 222-fluxing holes, 230-core support sleeves, 240-sand hanging pieces and 250-cleaning grooves;
300-casting;
400-mould, 410-magnetic component, 420-living material.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the application. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be the interior of two original elements together. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
The embodiment of the application discloses a casting method of an inner cavity structure casting, as shown in fig. 3 and 4, the disclosed inner cavity structure casting adopts sand casting, a sand mold is used for forming the appearance structure of the casting, and a sand core 130 arranged in a sand mold cavity is used for forming the inner cavity structure of the casting. Because most or all areas of the sand core 130 are suspended in the cavity, the sand core 130 is supported by adopting a core support so as to prevent casting defects caused by factors such as displacement and damage of the sand core 130; in the casting process, the chaplet and the high-temperature molten metal are melted into a whole to become a part of the casting. The bottom of the sand core 130 disclosed by the application is a key part of a casting, the casting size and the rest quality requirements are very strict, and the casting is not suitable for designing chaplets at the position, so that a plurality of chaplets are designed at the inclined plane of the side surface of the sand core 130 to support the sand core 130.
The casting method of the inner cavity structure casting disclosed by the embodiment of the application can comprise the following steps:
and a lower box molding for forming a lower sand mold 110. In the molding process, the chaplet is fixed on the cavity surface of the inclined surface of the lower sand mold 110, and the chaplet is designed into a chaplet main body 220 and a supporting rod 210. The core support main body 220 is disposed in the cavity and is used for supporting the sand core 130; the support bar 210 is buried in the lower sand mold 110 for fixing the support body 220 connected to the support bar 210.
Specifically, as shown in fig. 1 and 2, a positioning groove may be provided at the inclined surface of the mold 400, and the chaplet body 220 is placed in the positioning groove, and the struts 210 are located outside the positioning groove. The mold 400 is placed at a predetermined position of the drag flask, and the lower sand mold 110 is formed by molding the sand, and the struts 210 exposed outside the positioning grooves are buried in the lower sand mold 110.
The chaplet main body 220 is melted with high temperature molten metal into a whole in the casting process, and finally becomes a part of the casting, and the chaplet main body 220 cannot be stained with dirt such as sand, resin, paint and the like, and cannot be collided and damaged. In order to prevent the chaplet body 220 from being damaged by friction with the mold 400 and being contaminated during molding, before the chaplet body 220 is placed in the positioning groove, a chaplet sleeve 230 matched with the chaplet body 220 is sleeved on the chaplet body 220, and the chaplet sleeve 230 is placed in the positioning groove together with the chaplet body 220.
Further, in order to fix the chaplet body 220 in the positioning groove, a movable material 420 may be provided between the chaplet sleeve 230 and the sidewall of the positioning groove for clamping the chaplet sleeve 230.
Further, in order to prevent the chaplet body 220 from falling from the positioning groove, a magnetic attraction member 410 may be fixed to the bottom of the positioning groove for attracting the chaplet sleeve 230 and the chaplet body 220.
And (3) upper box molding, which is used for forming an upper sand mold 120. The upper case mold may be the same mold as the lower case mold, or may be different molds, which is not particularly limited in the embodiment of the present application.
The upper box is lifted, and if the upper box and the lower box use the same die, the upper box is lifted firstly, and then the lower box is lifted; if the upper box and the lower box use different moulds, the mould stripping sequence is not specifically required. After the lower box is lifted, the supporting rod 210 is buried in the lower sand mold 110, and the supporting main body 220 and the core supporting sleeve 230 sleeved on the supporting main body are firmly arranged on the cavity surface of the lower sand mold 110.
Core making is used to form the sand core 130. The sand core 130 may be formed by hand using a core box or by 3D printing.
Further, a plurality of refractory bricks 131 can be paved at the positions corresponding to the chaplets on the surface of the sand core 130, so as to improve the local high temperature resistance of the sand core 130 and the compressive strength thereof and prevent the chaplets from damaging the sand core 130.
The coating is applied to the surfaces of the upper sand mold 120, the lower sand mold 110 and the sand core 130, and the chaplet sleeve 230 has a protective effect on chaplet during this process, preventing the coating from contaminating the chaplet main body 220, so as to affect the fusible characteristics of the chaplet main body 220 and form casting defects such as slag inclusion, unmelted metal and the like. After application, the chaplet 230 may be removed.
Core assembly and box assembling, wherein the sand core 130 is assembled into the cavity of the lower sand mold 110, and the core-down in-place condition is detected. At this time, one end of the core supporting body 220 facing away from the supporting rod 210 is supported at the inclined plane of the sand core 130, so as to prevent the sand core 130 from shifting in this and subsequent steps. After core assembly, the cope flask is combined with the drag flask and clamped.
Pouring, injecting liquid metal into the cavity, melting the chaplet and the high-temperature molten metal into a whole, and cooling to form the casting 300 together.
After the casting 300 is knocked out from the flask, the support rods 210 remain on the surface of the casting 300, and the support rods 210 can be removed from the surface of the casting 300 by post-treatment.
Further, a cleaning groove 250 may be provided at an end of the strut 210 facing the chaplet body 220, where the cross-sectional area of the strut 210 is small, and the strut 210 may be broken by striking the strut 210 with an impact force. The impact force is preferably applied by hammering.
In the disclosed embodiment of the present application, as shown in fig. 5, in order to improve the meltability of the jammer body 220, the jammer body 220 is provided with an outer spiral structure 221 on the surface thereof. Correspondingly, the inner surface of the chaplet sleeve 230 is also provided with an inner spiral structure matching the outer spiral structure 221, and the chaplet main body 220 may be screwed into the chaplet sleeve 230. At this time, the outer spiral structure 221 of the chaplet main body 220 is in limit fit with the inner spiral structure of the chaplet sleeve 230, so as to realize the protection detachable connection between the chaplet main body 220 and the chaplet sleeve 230.
To further enhance the meltability of the jammer body 220, the outer spiral 221 of the jammer body 220 may be provided with a plurality of fluxing holes 222. To ensure the melting uniformity of the chaplet body 220, the fluxing holes 222 are preferably arranged at uniform intervals along the outer spiral extending direction.
In the disclosed embodiment of the application, the end of the support rod 210 facing away from the chaplet body 220 may be provided with a sand hanging member 240, and the cross-sectional area of the sand hanging member 240 is larger than that of the support rod 210, so as to prevent the chaplet from being lifted out together with the mold 400 during mold stripping, and prevent the sand core 130 from being overweight, transmitted through the chaplet body 220, and crush the lower sand mold 110.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (9)
1. A method of casting a casting of an internal cavity structure, characterized by using a plurality of chaplets to support a sand core for forming the internal cavity structure; the chaplet comprises a chaplet main body and a supporting rod arranged at one end of the chaplet main body;
the casting method comprises the following steps:
modeling, wherein a positioning groove is formed in the inclined surface of the die, the core support main body sleeved with the core support sleeve is arranged in the positioning groove, and the supporting rod is positioned outside the positioning groove; placing the mold in a drag flask, and molding the sand to form a drag mold; the support rod is buried in the lower sand mold;
after the die is pulled out, the core support sleeve is removed, and the core support main body is positioned in the cavity of the lower sand mold;
the core supporting main body props against the inclined surface of the sand core;
and (5) cleaning the support rod exposed out of the surface of the casting after mold closing, pouring and mold breaking.
2. The casting method of the inner cavity structure casting according to claim 1, wherein an outer spiral structure is arranged on the surface of the chaplet main body, an inner spiral structure matched with the outer spiral structure is arranged in the chaplet sleeve, and the outer spiral structure is in limit fit with the inner spiral structure.
3. The method of casting a casting having an inner cavity structure according to claim 2, wherein a plurality of fluxing apertures are provided in the outer spiral structure at uniform intervals.
4. The casting method of the casting with the inner cavity structure according to claim 1, wherein one end of the supporting rod, which is away from the chaplet main body, is provided with a sand hanging piece, and the cross-sectional area of the sand hanging piece is larger than that of the supporting rod.
5. The method of casting a casting of an inner cavity structure according to claim 1, wherein the end of the strut facing the chaplet body is provided with a cleaning groove.
6. The method of casting a casting of an inner cavity structure according to claim 1, wherein the positioning groove bottom is provided with a magnetic attraction component.
7. The method of casting a casting of an inner cavity structure according to claim 1, wherein after the step of molding, the chaplet body is placed in the positioning groove, a living material is placed in a gap between the chaplet body and the positioning groove and is clamped.
8. The method of casting a casting of an inner cavity structure according to claim 1, further comprising the step of applying a coating to the lower sand mold surface prior to removal of the core sleeve.
9. The method of casting a casting of an inner cavity structure according to any one of claims 1 to 8, wherein refractory bricks are laid at positions of the sand core corresponding to the chaplet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311085064.1A CN117047042A (en) | 2023-08-28 | 2023-08-28 | Casting method of inner cavity structure casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311085064.1A CN117047042A (en) | 2023-08-28 | 2023-08-28 | Casting method of inner cavity structure casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117047042A true CN117047042A (en) | 2023-11-14 |
Family
ID=88658778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311085064.1A Pending CN117047042A (en) | 2023-08-28 | 2023-08-28 | Casting method of inner cavity structure casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117047042A (en) |
-
2023
- 2023-08-28 CN CN202311085064.1A patent/CN117047042A/en active Pending
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