CN217121649U - Vacuum melting is with heat preservation device of casting mould shell - Google Patents
Vacuum melting is with heat preservation device of casting mould shell Download PDFInfo
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- CN217121649U CN217121649U CN202220093597.9U CN202220093597U CN217121649U CN 217121649 U CN217121649 U CN 217121649U CN 202220093597 U CN202220093597 U CN 202220093597U CN 217121649 U CN217121649 U CN 217121649U
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Abstract
The utility model provides a vacuum melting is with heat preservation device of casting mould shell, including the device body, the device body is bottom seal, upper end open-ended tubular structure, the device body includes the bottom plate, fix outside stay tube, middle bushing pipe and interior bushing pipe on the bottom plate, outside stay tube, middle bushing pipe and interior bushing pipe are for setting gradually from outer to interior coaxial, and the height equals, outside stay tube, middle bushing pipe and interior bushing pipe's upper end are equipped with annular apron and connect fixedly, two cavitys that form between the outer wall of interior bushing pipe and the middle bushing pipe inner wall, between middle bushing pipe outer wall and the outside stay pipe inner wall are taken out into the vacuum chamber, form the heat preservation chamber that supplies the built-in of mould shell after preheating between the up end of bottom plate and the interior bushing pipe inner wall. The utility model has the advantages of simple and reasonable structure, convenient operation, it is effectual to keep warm, uses safe and reliable to need not to reform transform current response melting equipment, maintain simple and conveniently, the cost is also lower.
Description
Technical Field
The utility model belongs to the technical field of vacuum induction melting and investment casting, a vacuum melting is with heat preservation device of casting mould shell is related to.
Background
In the investment casting process, the feeding effect which can be achieved by casting a casting is related to the cooling speed of the metal liquid, if the casting is solidified before reaching the inside of a casting die cavity, the phenomenon of incomplete casting can occur, and when the temperature of a die shell is too low, the temperature difference between the die shell and the casting liquid is large, so that the molten liquid in the casting process is easy to splash, the casting is cracked and the like. Therefore, the mold shell needs to be preheated before use in investment casting to prevent the casting from defects such as local porosity and cracks. However, since a general melting furnace does not have a condition for heating the mold shell, it is necessary to separately heat the mold shell by another heating furnace, and transfer the mold shell to a melting furnace for casting after the mold shell is sufficiently preheated.
Vacuum induction melting and investment casting technologies are closely related, and because the whole melting process is in vacuum, impurities in the air and the like can be prevented from entering the metal liquid, so that the metallurgical quality is improved. During vacuum smelting, firstly vacuum pumping is carried out, and then smelting and casting are carried out. Because the mould shell is a thin hollow shell structure, the heat dissipation speed is very fast, at present, the metal raw material is melted under the vacuum condition, then the film is cooled, then the furnace cover of the vacuum induction furnace is opened, the preheated mould shell is placed into the furnace cavity of the smelting furnace, and then the mould shell is vacuumized, heated and melted again to finish the casting. In this process, the opening of the furnace lid causes air to enter, which is liable to cause high-temperature oxidation, so that the quality of the final casting is affected. Meanwhile, the vacuum melting furnace is opened, so that the temperature loss is excessive, heat is wasted, secondary waste of energy can be caused by reheating and melting, and the casting efficiency is reduced.
Therefore, how to achieve the best heat preservation effect in the period from the preheating end of the formwork to the casting time, and slowing down the heat dissipation of the formwork becomes a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
The utility model aims to solve the technical problem that a heat preservation device of casting mould shell for vacuum melting that structural design is reasonable, convenient operation, heat preservation are effectual is provided to foretell technical situation.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a vacuum melting is with heat preservation device of casting mould shell, includes the device body, its characterized in that: the device body is of a cylindrical structure with a sealed bottom and an open upper end, and comprises a bottom plate, an outer side supporting tube, a middle liner tube and an inner liner tube which are fixed on the bottom plate, wherein the outer side supporting tube, the middle liner tube and the inner liner tube are coaxially and sequentially arranged from outside to inside and have equal heights, the upper ends of the outer side supporting tube, the middle liner tube and the inner liner tube are fixedly connected with an annular cover plate, two cavities formed between the outer wall of the inner liner tube and the inner wall of the middle liner tube and between the outer wall of the middle liner tube and the inner wall of the outer side supporting tube are pumped into vacuum cavities, and a heat preservation cavity for placing a preheated formwork is formed between the upper end surface of the bottom plate and the inner wall of the inner liner tube.
As an improvement, the bottom plate, the outer side supporting tube, the middle liner tube, the inner liner tube and the cover plate are all made of 304 austenitic stainless steel, the lower ends of the outer side supporting tube, the middle liner tube and the inner liner tube are fixedly welded with the bottom plate, and the upper ends of the outer side supporting tube, the middle liner tube and the inner liner tube are fixedly welded with the cover plate.
Furthermore, sealing gaskets are arranged among the bottom plate, the cover plate, the outer side supporting tube, the middle liner tube and the inner lining tube.
Furthermore, two groups of interfaces corresponding to the two vacuum cavities are arranged on the cover plate and are connected with the vacuum pump and the vacuum meter.
Furthermore, heat preservation cotton is arranged on the inner wall of the lining pipe in the heat preservation cavity, and a graphite gasket is arranged on the upper end face of the bottom plate.
And finally, the left side and the right side of the outer wall of the outer side supporting tube are respectively and symmetrically provided with lifting lugs, and the lifting lugs are arranged at the middle-upper position of the height of the device body.
Compared with the prior art, the utility model has the advantages of: the heat preservation device is designed into a double-layer vacuum structure by utilizing the characteristic of good vacuum thermal insulation, and simultaneously, the heat preservation cotton is arranged, so that multiple heat preservation of the casting mould shell for vacuum smelting is realized, the heat preservation time is long, the heat preservation effect is good, the mould shell can be directly placed into a vacuum induction furnace after the preheating of a heating furnace is finished, and the casting can be directly finished without opening the furnace and carrying out secondary heating in the smelting process, so that the utilization rate of energy and heat is improved, and the casting efficiency and the casting quality are improved; the structure of the double-layer vacuum cavity can not only meet the stable safety of the device, but also reduce the dead weight of the device and facilitate the transfer of the formwork. The utility model has the advantages of simple and reasonable structure, convenient operation, it is effectual to keep warm, uses safe and reliable to need not to reform transform current response melting equipment, maintain simple and conveniently, the cost is also lower.
Drawings
FIG. 1 is an external view of the structure of an embodiment of the present invention;
fig. 2 is a longitudinal sectional view of an embodiment of the present invention;
fig. 3 is a top view of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 1, 2 and 3, the heat preservation device of the casting mold shell for vacuum melting comprises a device body, wherein the device body is of a cylindrical structure with a sealed bottom and an open upper end, the device body comprises a bottom plate 1, an outer side supporting tube 2, a middle liner tube 3 and an inner liner tube 4, the outer side supporting tube 2, the middle liner tube 3 and the inner liner tube 4 are coaxially and sequentially arranged from outside to inside and have equal heights, and annular cover plates 5 are arranged at the upper ends of the outer side supporting tube 2, the middle liner tube 3 and the inner liner tube 4 and are connected and fixed; the bottom plate 1, the outer side supporting tube 2, the middle liner tube 3, the inner liner tube 4 and the cover plate 5 are all made of 304 austenitic stainless steel, the lower ends of the outer side supporting tube 2, the middle liner tube 3 and the inner liner tube 4 are fixedly welded with the bottom plate 1, and the upper ends of the outer side supporting tube 2, the middle liner tube 3 and the inner liner tube 4 are fixedly welded with the cover plate 5. Two cavities formed between the outer wall of the inner lining pipe 4 and the inner wall of the middle lining pipe 3 and between the outer wall of the middle lining pipe 3 and the inner wall of the outer side supporting pipe 2 are pumped into vacuum cavities, and a heat preservation cavity 11 for placing a preheated formwork is formed between the upper end surface of the bottom plate 1 and the inner wall of the inner lining pipe 4. Sealing gaskets 6 are arranged among the bottom plate 1, the cover plate 5, the outer side supporting tube 2, the middle liner tube 3 and the inner liner tube 4 to improve the sealing performance.
Two groups of interfaces 9 corresponding to the two vacuum cavities are arranged on the cover plate 5, and the interfaces 9 are connected with a vacuum pump and a vacuum meter and used for detecting the vacuum degrees of the two vacuum cavities and ensuring the vacuum. The inner wall of the lining pipe 4 in the heat preservation cavity 11 is provided with heat preservation cotton 8, and the upper end surface of the bottom plate 1 is provided with a graphite gasket 7.
The left side and the right side of the outer wall of the outer side supporting pipe 2 are respectively symmetrically provided with lifting lugs 10, so that the lifting and transferring are facilitated, and the lifting lugs 10 are arranged at 1/3 of the height of the device body.
During vacuum smelting, the mould shell preheated in the heating furnace is placed in the heat preservation cavity 11, then the mould shell is transferred into the vacuum smelting furnace, the furnace cover is closed, vacuum pumping is carried out, alloy raw materials are heated and melted, and finally casting is finished.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The utility model provides a vacuum melting is with heat preservation device of casting mould shell, includes the device body, its characterized in that: the device body is of a cylindrical structure with a sealed bottom and an open upper end, and comprises a bottom plate, an outer side supporting tube, a middle liner tube and an inner liner tube which are fixed on the bottom plate, wherein the outer side supporting tube, the middle liner tube and the inner liner tube are coaxially and sequentially arranged from outside to inside and have equal heights, the upper ends of the outer side supporting tube, the middle liner tube and the inner liner tube are fixedly connected with an annular cover plate, two cavities formed between the outer wall of the inner liner tube and the inner wall of the middle liner tube and between the outer wall of the middle liner tube and the inner wall of the outer side supporting tube are pumped into vacuum cavities, and a heat preservation cavity for placing a preheated formwork is formed between the upper end surface of the bottom plate and the inner wall of the inner liner tube.
2. The insulating apparatus according to claim 1, characterized in that: the bottom plate, the outer side supporting tube, the middle liner tube, the inner liner tube and the cover plate are all made of 304 austenitic stainless steel, the lower ends of the outer side supporting tube, the middle liner tube and the inner liner tube are fixedly welded with the bottom plate, and the upper ends of the outer side supporting tube, the middle liner tube and the inner liner tube are fixedly welded with the cover plate.
3. The insulating device according to claim 2, characterized in that: sealing gaskets are arranged among the bottom plate, the cover plate, the outer side supporting tube, the middle liner tube and the inner lining tube.
4. The insulating device according to claim 1, characterized in that: two groups of interfaces corresponding to the two vacuum cavities are arranged on the cover plate and are connected with the vacuum pump and the vacuum meter.
5. The insulating device according to claim 1, characterized in that: the inner wall of the lining pipe in the heat-preservation cavity is provided with heat-preservation cotton, and the upper end surface of the bottom plate is provided with a graphite gasket.
6. The thermal insulation apparatus according to any one of claims 1 to 5, characterized in that: the left side and the right side of the outer wall of the outer side supporting tube are respectively symmetrically provided with a lifting lug, and the lifting lugs are arranged at the middle-upper position of the height of the device body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220093597.9U CN217121649U (en) | 2022-01-14 | 2022-01-14 | Vacuum melting is with heat preservation device of casting mould shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220093597.9U CN217121649U (en) | 2022-01-14 | 2022-01-14 | Vacuum melting is with heat preservation device of casting mould shell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217121649U true CN217121649U (en) | 2022-08-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220093597.9U Active CN217121649U (en) | 2022-01-14 | 2022-01-14 | Vacuum melting is with heat preservation device of casting mould shell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217121649U (en) |
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2022
- 2022-01-14 CN CN202220093597.9U patent/CN217121649U/en active Active
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