CN216543825U - Annealing device for special-shaped fusion-cast aluminum oxide castings - Google Patents
Annealing device for special-shaped fusion-cast aluminum oxide castings Download PDFInfo
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- CN216543825U CN216543825U CN202123312906.1U CN202123312906U CN216543825U CN 216543825 U CN216543825 U CN 216543825U CN 202123312906 U CN202123312906 U CN 202123312906U CN 216543825 U CN216543825 U CN 216543825U
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Abstract
The utility model discloses an annealing device for a special-shaped fusion-cast aluminum oxide casting, which comprises a box body, wherein a light insulating brick layer is tiled on the inner side wall of the box body, an aluminum silicate fiber felt layer and a quartz sand layer are sequentially tiled from the inside of the light insulating brick layer, and a mould layer for shaping the casting is fixedly arranged inside the quartz sand layer; after the casting is formed on the mold layer, the heat-insulating layer always exists, so that the temperature gradient of the casting in the cooling and solidification process of high-temperature liquid can not fluctuate greatly during the annealing of the casting, the casting can be cooled uniformly, and cracks on the casting can be effectively prevented.
Description
Technical Field
The utility model relates to an industrial casting annealing device, in particular to an annealing device for special-shaped fusion-cast aluminum oxide castings.
Background
The fused cast alpha beta alumina chute brick is an indispensable special refractory material for the glass melting furnace at present. Its outstanding advantage is low content of glass phase. Has excellent glass liquid erosion resistance below 1350 ℃, hardly causes pollution to molten glass liquid, and can ensure the high quality of glass products. However, the alpha beta fusion-cast alumina trough is a U-shaped trough, has a special shape, is provided with an arc, a groove and a plurality of inclined planes with different angles, and has a narrow crystallization range, a large thermal expansion coefficient and a complex shape. The traditional annealing process is that a sand mould with the thickness of 40mm is arranged in a casting basket filled with quartz sand with the thickness of 8 Omm-100 mm at the periphery, after casting, other heat preservation measures are not needed, and the casting is naturally annealed for 10-15 days and then taken out of the box, but the casting obtained by the annealing process has the defects of a large number of cracks and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an annealing device for a special-shaped fusion-cast aluminum oxide casting, which solves the problem that the casting has a large number of cracks due to natural annealing without other heat preservation measures after the casting of a workpiece.
The utility model is realized by the following technical scheme:
the utility model provides an annealing device for special shaped fusion cast aluminium oxide foundry goods, includes the box, the bottom tiling of box sets up light insulating brick layer, from the box around to inside alumina silicate fiber felt layer and the quartz sand layer of tiling in proper order, the inside fixed mould layer that is provided with of quartz sand layer is provided with the casting die cavity that becomes that is used for the design foundry goods on the mould layer.
The device realizes the functions as follows: the device welds the box earlier, paves in proper order from the inside wall of box to the inside of box and connects light insulating brick layer, aluminium silicate fiber felt layer and quartz sand layer, fixes the good mould layer, and the process that specifically paves and connect is as follows: when in use, the light insulating brick layer is firstly laid at the bottom in the box body, the aluminum silicate fiber felt layer is laid on the periphery of the box body, the quartz sand layer is laid, the mould layer is then placed in the cavity, the quartz sand layer, the aluminum silicate fiber felt layer and other heat insulating materials are further laid on the periphery of the mould, and the casting opening is only reserved at the upper part. When the casting mold is used in production, high-temperature molten liquid is injected into the cavity of the mold from a casting gate reserved on the upper part of the mold layer, and a casting is formed in the mold layer after the liquid is cooled and solidified; laying a layer of heat insulation material on the opening for insulating the casting at the pouring gate part; after the casting is formed, the heat-insulating layer always exists, so that the temperature gradient of the casting in the cooling and solidification process of high-temperature liquid can not fluctuate greatly during the annealing of the casting, the casting can be cooled uniformly, and cracks on the casting can be effectively prevented.
Furthermore, the box body is arranged into a frame shape, an opening is reserved at the top of the box body, and no other gap exists after welding forming. Other heat preservation layers are conveniently paved and connected when the opening is formed in the top, and other gaps are not reserved after welding so as to guarantee the sealing performance of the box body except the opening, so that the heat preservation effect is guaranteed.
Furthermore, the light heat-insulating brick layer is flatly paved at the bottom of the box body, and the thickness of the light heat-insulating brick layer is 300mm to 400 mm. The light insulating brick layer is used for insulating heat and ensuring the stability of the device.
Furthermore, an aluminum silicate fiber felt layer is paved on the inner side wall of the box body and is positioned at the upper part of the light insulating brick layer. For further heat preservation.
Further, the aluminium silicate fibre felt layer is laid in at least 3 layers, and each layer is set to be 48mm to 52mm thick. The heat preservation effect after the aluminum silicate fiber felt layer is paved and connected is ensured.
Further, a quartz sand layer is laid on the whole inner side wall inside the aluminum silicate fiber felt layer.
Further, the paving thickness of the quartz sand layer is 200mm to 250 mm. The heat preservation effect after the quartz sand layer is paved and connected is ensured.
Further, the mould layer is arranged inside the quartz sand layer. The mould is used for casting a casting to fix the shape of the casting, and a cavity is formed at a position spaced from the box body, so that the thermal insulation material is conveniently paved.
Furthermore, the mould layer is a magnesium sand layer taking water glass as a bonding agent. Magnesite belongs to an alkaline material, has the density of about 3.5g/cm3 and the melting point of 2800 ℃. The magnesite has small thermal expansion amount and no volume mutation caused by phase change, and is an ideal casting material for producing fusion-cast alpha-beta alumina bricks.
Further, the thickness of the mold layer is set to 40mm to 50 mm. The molding and later-period demolding during casting are facilitated.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
an annealing device for a special-shaped fusion-cast aluminum oxide casting comprises a box body, wherein a light insulating brick layer is flatly laid on the inner side wall of the box body, an aluminum silicate fiber felt layer and a quartz sand layer are continuously flatly laid in sequence from the inside of the light insulating brick layer, and a mold layer for shaping the casting is fixedly arranged inside the quartz sand layer; after the casting is formed on the mold layer, the heat-insulating layer always exists, so that the temperature gradient of the casting in the cooling and solidification process of high-temperature liquid can not fluctuate greatly during the annealing of the casting, the casting can be cooled uniformly, and cracks on the casting can be effectively prevented.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the principles of the utility model. In the drawings:
FIG. 1 is a schematic cross-sectional structural view of an entire device provided in an embodiment of the present invention;
FIG. 2 is a schematic structural sectional view of the casting device according to the embodiment of the present invention;
fig. 3 is a schematic three-dimensional structure diagram of one mold of the apparatus according to the embodiment of the present invention.
Reference numbers and corresponding part names in the drawings:
1-box body, 2-light insulating brick layer, 3-aluminum silicate fiber felt layer, 4-quartz sand layer, 5-mould layer, 6-casting forming cavity and 7-casting.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the utility model. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.
Example 1
This embodiment 1 provides an annealing device for special shaped fusion cast aluminium oxide foundry goods, as shown in fig. 1-3, including box 1, the bottom tiling of box 1 sets up light insulating brick layer 2, from box 1 all around to inside tiling aluminium silicate fiber felt layer 3 and quartz sand layer 4 in proper order, the inside fixed mould layer 5 that is provided with of quartz sand layer 4, be provided with the casting die cavity 6 that becomes that is used for stereotyped foundry goods 7 on the mould layer 5.
The device realizes the functions as follows: the device welds well box 1 earlier, paves in proper order to the inside of box 1 from the inside wall of box 1 and connects light insulating brick layer 2, aluminium silicate fiber felt layer 3 and quartz sand layer 4, fixes good mould layer 5, and the process that specifically paves connects is as follows: the box body 1 is a big iron box body 1 with an opening at the upper part, when in use, the light insulating brick layer 2 is firstly paved at the bottom in the box body 1, the aluminum silicate fiber felt layer 3 is paved at the periphery of the box body 1, then the quartz sand layer 4 is paved, then the mould layer 5 is put into the cavity, the quartz sand layer 4, the aluminum silicate fiber felt layer 3 and other insulating materials are paved at the periphery of the mould, and a casting opening is only reserved at the upper part. When the casting mold is used in production, high-temperature molten liquid is injected into the cavity of the mold from a casting gate reserved on the upper part of the mold layer 5, and a casting 7 is formed in the mold layer 5 after the liquid is cooled and solidified; then, a layer of heat insulation material is laid on the opening and used for insulating the casting 7 at the pouring gate part; after the casting 7 is formed, the heat-insulating layer always exists, so that the temperature gradient of the casting 7 in the cooling and solidification process of high-temperature liquid can not fluctuate greatly during annealing of the casting 7, the casting 7 can be cooled uniformly, and cracks on the casting 7 can be effectively prevented.
In this embodiment, the box body 1 is set to be frame-shaped, an opening is reserved at the top of the box body 1, and no other gap is left after welding and forming. Other heat preservation of convenient laying of connecing when the top sets up the opening, do not leave other gaps after the welding in order to guarantee the leakproofness of box 1 except the opening to guarantee the heat preservation effect. The side wall of the box body 1 is welded by steel plates and angle steels, the welding is compact and firm, the air tightness is realized, and the good heat insulation performance is ensured.
In this embodiment, the light insulating brick layer 2 is flatly paved at the bottom of the box body 1, and the thickness of the light insulating brick layer 2 is 300mm to 400 mm. The light insulating brick layer 2 is used for insulating heat firstly and also ensures the stability of the device.
In this embodiment, the aluminum silicate fiber felt layer 3 is laid on the inner side wall of the box body 1 and is positioned on the upper part of the light insulating brick layer 2. For further heat preservation.
In the present embodiment, the aluminium silicate fibre felt layer 3 is laid at least 3 layers and each layer is set to a thickness of 48mm to 52 mm. The heat preservation effect after the aluminum silicate fiber felt layer 3 is paved and connected is ensured. The quartz sand layer 4 is laid on the whole inner side wall inside the aluminum silicate fiber felt layer 3. The heat conductivity coefficient of the aluminum silicate fiber felt is 0.09W/M ℃, the service temperature is more than or equal to 1000 ℃, and the aluminum silicate fiber felt has good heat preservation performance.
In the present embodiment, the quartz sand layer 4 is laid to a thickness of 200mm to 250 mm. The heat preservation effect after the quartz sand layer 4 is paved and connected is ensured. The quartz sand of the quartz sand layer 4 adopted between the aluminum silicate fiber felt layer 3 and the mould layer 5 has the granularity of 20-70 meshes, the content of SiO2 is more than or equal to 97 percent, and the aluminum silicate fiber felt has good air permeability and low value.
In the present embodiment, the mold layer 5 is provided inside the quartz sand layer 4. The grinding tool is used for casting the casting 7, fixing the shape of the casting 7, and forming a cavity at a position spaced from the box body 1 to facilitate laying and connecting of a heat-insulating material.
In this embodiment, the mold layer 5 is a magnesium sand layer using water glass as a binder. Magnesite belongs to an alkaline material, has the density of about 3.5g/cm3 and the melting point of 2800 ℃. The magnesite has small thermal expansion amount and no volume mutation caused by phase change, and is an ideal casting material for producing fusion-cast alpha-beta alumina bricks. The thickness of the mold layer 5 is set to 40mm to 50 mm. . The later-stage demoulding is convenient. The mould layer 5 adopts a magnesia sand mould combined with water glass. Magnesite belongs to an alkaline material, has the density of about 3.5g/cm3 and the melting point of 2800 ℃. The magnesite has small thermal expansion amount and no volume mutation caused by phase change, is an ideal casting mold material for producing the fusion-cast alpha-beta alumina brick, has good strength, collapsibility and deformability under the action of high temperature, is less in sand adhesion, cracks and the like, and has good appearance quality. Good de-dispersibility on demolding makes demolding simpler and less sticky.
Example 2
The design principle of the device is as follows: the stress and strain of the molten and cast refractory material during cooling crystallization are the main causes of cracking and scrapping of the casting 7. And the batch mixture of the casting alpha beta alumina chute brick is heated to about 2100 ℃ by a three-phase electric arc furnace to form feed liquid. Because of the existence of Na20, the beta crystal phase and the alpha crystal phase start to be simultaneously precipitated at about 1900 ℃ in the cooling process, and the whole crystallization process has no phase change, so the cooling crystallization process only has thermal stress, and in addition, the casting channel brick casting mold of the fusion casting alpha beta alumina runner channel does not need a core, so the mechanical barrier stress can not be considered, and the key of the annealing process is to control the thermal stress within an allowable range by a process means.
The thermal stress is formed by generating a temperature gradient between the surface and the center of the casting 7 in the cooling process, the cooling state of the casting alpha beta alumina chute brick is measured, the casting temperature is 1950 ℃, after 15 minutes, the outer basket and the sand mold are removed, the surface temperature of the casting 7 is 1760 ℃, the casting 7 is crushed, the center of the casting 7 is still in a flowable liquid state, a solidified layer with the thickness of about 27mm is formed on the surface of the casting 7, the thermal stress of the casting 7 is not actually formed at the moment, and the shrinkage stress generated by the crystallized layer on the surface of the casting 7 can be eliminated in the melt with the fluidity at the center part of the casting 7. Therefore, after the casting 7 is formed on the die layer 5, the heat-insulating layer is arranged, so that the temperature gradient of the casting 7 in the cooling and solidification process of high-temperature liquid can not fluctuate greatly during annealing of the casting 7, the casting 7 can be cooled uniformly, and cracks on the casting 7 can be effectively prevented. Is a feasible technical approach for solving the annealing problem of the casting alpha beta alumina chute brick.
In addition, the mould layer 5 is formed by bonding magnesia through water glass, and after casting, the mould is collapsed quickly under the action of high-temperature feed liquid. However, since the temperature of the feed liquid is very different from the ambient temperature, a layer of hard shell is formed around the feed liquid after casting, and the shape of the casting 7 is not affected even if the mold collapses.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides an annealing device for special shaped founding aluminium oxide foundry goods, a serial communication port, includes box (1), the bottom tiling of box (1) sets up light insulating brick layer (2), and the lateral wall all around of box (1) sets up aluminium silicate fiber felt layer (3), continues to lay quartz sand layer (4) inwards from light insulating brick layer (2) and aluminium silicate fiber felt layer (3), and quartz sand layer (4) inside fixed mould layer (5) that are provided with, be provided with the casting molding chamber (6) that are used for finalizing the design foundry goods (7) on mould layer (5).
2. The annealing device for special shaped fused cast alumina castings according to claim 1, characterized in that the box body (1) is provided in a frame shape, an opening is reserved on the top of the box body (1), and no other gap is left after welding.
3. The annealing device for special shaped fused cast alumina castings according to claim 1, characterized in that the layer of light insulating bricks (2) is laid flat on the bottom of the box (1), the layer of light insulating bricks (2) having a thickness of 300mm to 400 mm.
4. Annealing device for special shaped fused cast alumina castings according to claim 1, characterized in that said aluminium silicate fibre felt layer (3) is laid on the internal side walls of the box (1) and on top of the light insulating brick layer (2).
5. Annealing device for special shaped fused cast alumina castings according to claim 4, characterized in that the aluminium silicate fibre felt layer (3) is laid on at least 3 layers, each layer being set to a thickness of 48 to 52 mm.
6. Annealing device for special shaped fused cast alumina castings according to claim 1, characterized in that said layer of quartz sand (4) is laid on the whole internal side wall inside the aluminium silicate fibre felt layer (3).
7. Annealing device for special shaped fused cast alumina castings according to claim 6, characterized in that the quartz sand layer (4) is laid down with a thickness of 200mm to 250 mm.
8. Annealing device for special shaped fused cast alumina castings according to claim 1, characterized in that the mould layer (5) is placed inside the quartz sand layer (4) and the sides of the mould layer (5) are fixedly connected to the aluminium silicate fibre felt layer (3).
9. Annealing device for special shaped fused cast alumina castings according to claim 8, characterized in that the mould layer (5) is a magnesium sand layer with water glass as binder.
10. Annealing device for special shaped fused cast alumina castings according to claim 8, characterized in that the thickness of the mould layer (5) is set to 40 to 50 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123312906.1U CN216543825U (en) | 2021-12-27 | 2021-12-27 | Annealing device for special-shaped fusion-cast aluminum oxide castings |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123312906.1U CN216543825U (en) | 2021-12-27 | 2021-12-27 | Annealing device for special-shaped fusion-cast aluminum oxide castings |
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| CN216543825U true CN216543825U (en) | 2022-05-17 |
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| CN202123312906.1U Active CN216543825U (en) | 2021-12-27 | 2021-12-27 | Annealing device for special-shaped fusion-cast aluminum oxide castings |
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