CN212094296U - Low-pressure vacuum casting device - Google Patents
Low-pressure vacuum casting device Download PDFInfo
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- CN212094296U CN212094296U CN202020824345.XU CN202020824345U CN212094296U CN 212094296 U CN212094296 U CN 212094296U CN 202020824345 U CN202020824345 U CN 202020824345U CN 212094296 U CN212094296 U CN 212094296U
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Abstract
The utility model discloses a low pressure vacuum casting device, include: the device comprises a heat preservation furnace, a machine table, a liquid lifting pipe, an air compression station and a mold, wherein the machine table is fixedly connected with the heat preservation furnace, and the mold is arranged above the heat preservation furnace; the liquid lifting pipe is erected in the middle of the heat preservation furnace, and the top end of the liquid lifting pipe penetrates through the top of the heat preservation furnace and extends into the mold; the air compression station is connected to the upper part of the heat preservation furnace through a pipeline; the method is characterized in that: the machine table plate is fixedly provided with a mold sealing cover, the mold is arranged in the mold sealing cover, the mold sealing cover is sequentially connected with a vacuum tank and a vacuum pump through pipelines, and the pipelines are provided with a plurality of electromagnetic valves. The utility model discloses make the molten metal fill the gaseous more quick getting rid of in the type stage mould die cavity, make the molten metal heat preservation stove and the space of mould place line into great pressure differential simultaneously to it scraps to reduce foundry goods gas pocket, oxidation clamp sediment, shrinkage porosity.
Description
Technical Field
The utility model relates to a low pressure casting field especially relates to a low pressure vacuum casting device.
Background
Low pressure casting is a method of forming a casting by filling a cavity with liquid metal under pressure. In the production process of the existing common low-pressure casting process, mainly because (1) when molten metal is filled, gas in a mold cavity of the mold cannot be completely discharged, partial gas is remained in a casting to form air holes, and the problem of molten aluminum oxidation and slag inclusion is caused; (2) the bearing pressure of the low-pressure casting holding furnace is generally less than or equal to 1000mbar, the problems of air holes, oxidation slag inclusion, shrinkage porosity and the like of products are easily caused due to the restriction on the feeding capability of the pressure to castings, the quality of cast products is reduced, not only is the waste of casting raw materials caused, but also the hidden safety hazard of the buried use is caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a low pressure vacuum casting device to solve the problem that above-mentioned prior art exists, make metal casting liquid evenly fill in the model die cavity, reduce the casting product and appear gas pocket, oxidation clamp sediment, shrinkage porosity scheduling problem, improve casting product quality.
In order to achieve the above object, the utility model provides a following scheme: the utility model provides a low-pressure vacuum casting device, which comprises a heat preservation furnace, a machine table, a liquid lifting pipe, an air compression station and a mold, wherein the machine table comprises a machine table lower bedplate and a machine table upper bedplate, the machine table lower bedplate is fixedly connected with the heat preservation furnace, and the mold is arranged above the heat preservation furnace; the liquid lifting pipe is arranged in the middle of the heat preservation furnace 1, and the air compression station is connected to the upper part of the heat preservation furnace through a pipeline; the method is characterized in that: the machine table is fixedly provided with a mold sealing cover, the mold is arranged in the mold sealing cover, the mold sealing cover is sequentially connected with a vacuum tank and a vacuum pump through pipelines, a plurality of electromagnetic valves are arranged on the pipelines, the mold sealing cover is fixedly provided with a pressure boosting pipe, and the pressure boosting pipe is also provided with the electromagnetic valves.
Preferably, the mold sealing cover comprises an upper sealing cover and a lower sealing cover, and the lower sealing cover is fixedly connected with the lower table surface of the machine table; the upper sealing cover is fixedly connected with the upper table surface of the machine table.
Preferably, a sealing strip is fixed on the lower sealing cover.
Preferably, the electromagnetic valve is fixedly connected to a connection pipeline between the vacuum tank and the mold sealing cover, the electromagnetic valve is also arranged on the connection pipeline between the vacuum tank and the vacuum pump, a pressure-increasing pipe is fixed on the mold sealing cover, and the electromagnetic valve is also arranged on the pressure-increasing pipe.
The utility model discloses a following technological effect:
the low-pressure vacuum-pumping casting is combined with vacuum casting on the basis of low-pressure casting, so that gas in a mold cavity in a molten metal filling stage can be discharged more quickly, and a large pressure difference is formed between a molten metal holding furnace and a space where the mold is located, so that casting air holes, oxidation slag inclusion and shrinkage porosity scrap are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic structural diagram of the second embodiment of the present invention.
The device comprises a heat preservation furnace 1, a liquid lifting pipe 2, an air compression station 3, a mold sealing cover 4, an upper sealing cover 5, a lower sealing cover 6, a mold 7, a machine table lower table plate 8, a machine table upper table plate 9, a vacuum tank 10, a vacuum pump 11, an electromagnetic valve 12, aluminum liquid 13, an exhaust plug 14, a sealing ring 15, a vacuumizing pipeline 16 and a booster pipe 17.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
The first embodiment is as follows:
referring to fig. 1, the utility model provides a low pressure vacuum casting device, the device include heat preservation stove 1, board, stalk 2, air compression station 3 and mould 7, and the board includes platen 8 under the board and platen 9 on the board, and the platen is liftable under the board on the board for the board, and concrete structure is current structure. The liquid lifting pipe 2 is arranged in the middle of the heat preservation furnace 1, the liquid lifting pipe 2 is communicated with a cavity of the mold 7, and the air compression station 3 is connected to the middle upper part of the heat preservation furnace 1 through a pipeline. The machine table is fixedly connected with the heat preservation furnace 1, the machine table plate is fixed with a mold sealing cover 4, the mold 7 is arranged in the mold sealing cover 4, the mold sealing cover 4 is sequentially connected with a vacuum tank 10 and a vacuum pump 11 through pipelines, the pipelines are provided with a plurality of electromagnetic valves 12, the mold sealing cover 7 is fixed with a booster tube 17, and the booster tube 17 is provided with the electromagnetic valves 12.
According to a further optimized scheme, the mold sealing cover 4 comprises an upper sealing cover 5 and a lower sealing cover 6, bolt holes are reserved in the edge of the lower table plate 8 of the machine table, the two bolt holes correspond to each other, and the lower sealing cover 6 is fixedly connected with the lower table plate 8 of the machine table through bolts; go up sealed cowling 5 and reserve the bolt hole in the edge equally, reserve the bolt hole in platen 9 edges on the board, two bolt holes are corresponding, use the bolt to be connected upper sealed cowling 7 and platen 9 on the board.
In order to further optimize the scheme, a sealing strip is fixed on the lower sealing cover 6 for improving the sealing performance of the mold sealing cover 4. When the upper sealing cover 5 and the lower sealing cover 6 are buckled, the sealing strip improves the sealing performance of the die sealing cover 4.
In a further optimized scheme, a connection pipeline between the vacuum tank 10 and the mold sealing cover 4 is fixedly connected with an electromagnetic valve 12, and the connection pipeline between the vacuum tank 10 and the vacuum pump 11 is also provided with the electromagnetic valve 12.
According to the further optimized scheme, the shape of the mold sealing cover 4 can be set randomly according to the shape of the mold 7, and the cross section of the mold sealing cover 4 is in a circular shape or a polygonal ring shape so as to adapt to molds in different shapes. The die sealing cap 4 is preferably of steel material.
According to the further optimization scheme, the electromagnetic valve 12 is arranged on a pipeline connecting the air compression station 3 and the heat preservation furnace 1, and the pressurizing process of the air compression station 3 to the heat preservation furnace 1 is controlled through the switch of the electromagnetic valve. And the lower end surface of the connecting opening of the air compression station 3 and the heat preservation furnace 1 is higher than the liquid level of the aluminum liquid.
The casting production process comprises the following steps:
and (3) a mold filling stage:
after the upper sealing cover 5 and the lower sealing cover 6 of the mold sealing cover 4 are buckled, the platen 9 on the machine table and the platen 8 under the machine table longitudinally apply pressure to the mold sealing cover 4, the electromagnetic valve 12 on the pipeline connecting the air compression station 3 and the heat preservation furnace 1 is opened, the air compression station 3 injects dry compressed air into the heat preservation furnace 1, and simultaneously opens the electromagnetic valve 12 between the mold sealing cover 4 and the vacuum tank (at the moment, the electromagnetic valve 12 on the boosting pipe of the mold sealing cover 4 is in a closed state), the mold sealing cover 4 is communicated with the vacuum tank 10, the air pressure in the mold sealing cover rapidly drops, and the vacuumizing is completed. Because the edge of the mould 7 has a gap, pressure difference is generated between the inside and the outside of the mould 7, air in the mould 7 is discharged outwards, and meanwhile, the molten aluminum 13 enters the mould 7 from the holding furnace 1 through the riser tube 2 to start mould filling.
Pressure maintaining:
after the mold filling is finished, the electromagnetic valve 12 between the mold sealing cover 4 and the vacuum tank is closed, the electromagnetic valve 12 between the vacuum tank 10 and the vacuum pump 11 is opened, at the moment, the vacuum pump 11 works to vacuumize the vacuum tank 10 again, and preparation is made for the next vacuumizing work in the mold sealing cover 4. At this stage, the electromagnetic valve 12 between the air compression station 3 and the heat preservation furnace 1 is in an open state, so that the pressure of the hearth in the heat preservation furnace 1 is in a stable state until the casting solidification is completed, and the mold 7 is completely filled with the molten aluminum.
Pressure relief:
after casting and solidification are finished, closing the electromagnetic valve 12 between the air compression station 3 and the heat preservation furnace 1, automatically releasing pressure of the heat preservation furnace 1, opening the electromagnetic valve 12 on the booster pipe of the mold sealing cover 4, enabling the mold sealing cover 4 to be communicated with the atmosphere, enabling the air pressure in the mold sealing cover 4 to be restored to the atmospheric pressure, and enabling the aluminum liquid in the riser pipe 2 to flow back to the heat preservation furnace 1 under the action of gravity. And opening the mold to take the part after the natural cooling is finished. One casting cycle is completed.
Example two
Unlike example 1, the electromagnetic valve 12 on the pressure-increasing pipe of the mold closure 4 is opened at the completion of the mold filling and the start of the pressure holding in the casting process.
The specific casting production process comprises the following steps:
and (3) a mold filling stage:
after the upper sealing cover 5 and the lower sealing cover 6 of the mold sealing cover 4 are buckled, the platen 9 on the machine table and the platen 8 under the machine table longitudinally apply pressure to the mold sealing cover 4, the electromagnetic valve 12 on the pipeline connecting the air compression station 3 and the heat preservation furnace 1 is opened, the air compression station 3 injects dry compressed air into the heat preservation furnace 1, and simultaneously opens the electromagnetic valve 12 between the mold sealing cover 4 and the vacuum tank (at the moment, the electromagnetic valve 12 on the boosting pipe of the mold sealing cover 4 is in a closed state), the mold sealing cover 4 is communicated with the vacuum tank 10, the air pressure in the mold sealing cover rapidly drops, and the vacuumizing is completed. Because the edge of the mould 7 has a gap, pressure difference is generated between the inside and the outside of the mould 7, air in the mould 7 is discharged outwards, and meanwhile, the molten aluminum 13 enters the mould 7 from the holding furnace 1 through the riser tube 2 to start mould filling.
Pressure maintaining:
after the mold filling is finished, the electromagnetic valve 12 between the mold sealing cover 4 and the vacuum tank is closed, the electromagnetic valve 12 between the vacuum tank 10 and the vacuum pump 11 is opened, at the moment, the vacuum pump 11 works to vacuumize the vacuum tank 10 again, and preparation is made for the next vacuumizing work in the mold sealing cover 4. Opening an electromagnetic valve 12 on a booster pipe of the mold sealing cover 4 to communicate the mold sealing cover 4 with the atmosphere, and recovering the air pressure in the mold sealing cover 4 to the atmospheric pressure; at this stage, the electromagnetic valve 12 between the air compression station 3 and the heat preservation furnace 1 is in an open state, so that the pressure of the hearth in the heat preservation furnace 1 is in a stable state until the casting solidification is completed, and the mold 7 is completely filled with the molten aluminum.
Pressure relief:
after casting and solidification are finished, the electromagnetic valve 12 between the air compression station 3 and the heat preservation furnace 1 is closed, the heat preservation furnace 1 automatically releases pressure, and the aluminum liquid in the liquid lifting pipe 2 flows back to the heat preservation furnace 1 under the action of gravity. And opening the mold to take the part after the natural cooling is finished. One casting cycle is completed.
Example three:
referring to fig. 2, unlike the first embodiment, when the specification of the mold 7 is increased or the production needs, the structure of the mold sealing cover may be omitted, as shown in fig. 2, the mold 7 is modified, a vent plug 14 is installed inside the mold 7 by punching, a vacuum line 16 is installed above the vent plug 14, and a sealing ring 15 is provided at the connection between the vent plug 14 and the vacuum line 16 to improve the sealing performance of the mold 7. Directly bleed air to the mould inside to discharge the inside gas of mould 7, make aluminium liquid evenly fill in mould 7, prevent that gas from remaining and forming the gas pocket in the foundry goods, avoid causing the problem that aluminium liquid oxidation pressed from both sides the sediment simultaneously.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements to the technical solution of the present invention without departing from the spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.
Claims (4)
1. A low-pressure vacuum casting device comprises a heat preservation furnace (1), a machine table, a liquid lifting pipe (2), an air compression station (3) and a mold (7), wherein the machine table comprises a machine table lower bedplate (8) and a machine table upper bedplate (9), the machine table lower bedplate (8) is fixedly connected with the heat preservation furnace (1), and the mold (7) is arranged above the heat preservation furnace (1); the liquid lifting pipe (2) is arranged in the middle of the heat preservation furnace (1), and the air compression station (3) is connected to the middle upper part of the heat preservation furnace (1) through a pipeline; the method is characterized in that: the mould sealing cover (4) is fixed on the machine table, the mould (7) is arranged in the mould sealing cover (4), the vacuum tank (10) and the vacuum pump (11) are sequentially connected onto the mould sealing cover (4) through pipelines, a plurality of electromagnetic valves (12) are arranged on the pipelines, a booster pipe (17) is fixed on the mould sealing cover (4), and the electromagnetic valves (12) are arranged on the booster pipe (17).
2. The low-pressure vacuum casting apparatus according to claim 1, wherein: the mold sealing cover (4) comprises an upper sealing cover (5) and a lower sealing cover (6), and the lower sealing cover (6) is fixedly connected with a lower platen (8) of the machine table; the upper sealing cover (5) is fixedly connected with the upper bedplate (9) of the machine table.
3. A low-pressure vacuum casting apparatus as claimed in claim 2, wherein: and a sealing strip is fixed on the lower sealing cover (6).
4. The low-pressure vacuum casting apparatus according to claim 1, wherein: the electromagnetic valve (12) is fixedly connected to a connecting pipeline of the vacuum tank (10) and the mold sealing cover (4), and the electromagnetic valve (12) is also arranged on the connecting pipeline of the vacuum tank (10) and the vacuum pump (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020824345.XU CN212094296U (en) | 2020-05-18 | 2020-05-18 | Low-pressure vacuum casting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020824345.XU CN212094296U (en) | 2020-05-18 | 2020-05-18 | Low-pressure vacuum casting device |
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| CN212094296U true CN212094296U (en) | 2020-12-08 |
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| CN202020824345.XU Active CN212094296U (en) | 2020-05-18 | 2020-05-18 | Low-pressure vacuum casting device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112605367A (en) * | 2021-01-05 | 2021-04-06 | 于秀芹 | Micro-vacuum precision casting process |
| CN114951606A (en) * | 2022-06-08 | 2022-08-30 | 保定市立中车轮制造有限公司 | Vacuum suspension casting equipment and process |
-
2020
- 2020-05-18 CN CN202020824345.XU patent/CN212094296U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112605367A (en) * | 2021-01-05 | 2021-04-06 | 于秀芹 | Micro-vacuum precision casting process |
| CN114951606A (en) * | 2022-06-08 | 2022-08-30 | 保定市立中车轮制造有限公司 | Vacuum suspension casting equipment and process |
| CN114951606B (en) * | 2022-06-08 | 2023-10-24 | 保定市立中车轮制造有限公司 | Vacuum suspension casting equipment and process |
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