CN112496303A - Casting method of aluminum alloy extra-high voltage switch shell for gas insulated substation - Google Patents
Casting method of aluminum alloy extra-high voltage switch shell for gas insulated substation Download PDFInfo
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- CN112496303A CN112496303A CN202011420926.8A CN202011420926A CN112496303A CN 112496303 A CN112496303 A CN 112496303A CN 202011420926 A CN202011420926 A CN 202011420926A CN 112496303 A CN112496303 A CN 112496303A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
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Abstract
The invention belongs to a casting process in the mechanical manufacturing industry, and particularly relates to a casting method of an aluminum alloy extra-high voltage switch shell for a gas insulated substation. Be equipped with the type of going up on the independent resin sand module of type ring runner on last type ring runner, the outside border department of type ring runner is equipped with the type gap and waters, system the type on the assembly line, form type ring runner composite module by the independent resin sand module of type ring runner and symmetrical part, type ring runner composite module down is constituteed to the independent resin sand module of type ring runner and symmetrical part, can save nearly half of metal liquid for the pouring, the yield improves about 10%, energy consumption is reduced, and the production efficiency is improved, the sand mould is complete to be rateed well. The process is convenient to operate, the quality and the service life of the product are guaranteed, and the production efficiency is improved.
Description
Technical Field
The invention belongs to a casting process in the mechanical manufacturing industry, and particularly relates to a casting method of an aluminum alloy extra-high voltage switch shell for a gas insulated substation.
Background
At present, a gas insulated substation is widely applied to a power system, SF6 gas is adopted as an insulating medium in the interior of a pipeline tree in the gas insulated substation, an extra-high voltage switch shell exposed outside is applied to outdoor work, in order to ensure the safe reliability of circuit operation, a destructive pressure test needs to be carried out on the extra-high voltage switch shell, and the requirements on the mechanical property, the surface quality, the internal quality, the air tightness, the tolerance size and the like of the extra-high voltage switch shell exposed outside are extremely high. The inside of the shell of the ultra-high voltage switch is a cavity, the inner cavity of the shell is filled with SF6 gas with corresponding pressure, according to practical application, the high voltage switch shells are various in types, different in shape and size, different in wall thickness from 5 mm to 40mm, large, medium and small switch shells and heavy in weight range from several kilograms to several tons, and all the ultra-high voltage switches are combined into various cylinders in shape. The existing pouring method of the ultra-high voltage switch shell comprises the steps of placing vertical barrels on two sides of a mould in the molding process, taking out the vertical barrels after resin sand is solidified, then manually arranging a gap runner, wherein the solidification sequence is that ultra-high voltage switch shell castings are preferentially solidified, the solidification time of the gap runner is later than that of the shell castings after the gap runner is washed by high-temperature aluminum alloy liquid for a long time, and the section of each vertical barrel is later than that of the gap runner. Theoretically, when liquid is solidified into solid and is contracted in volume, a switch shell casting is continuously supplemented with the liquid to realize sequential solidification, the upper part and the lower part of a vertical barrel are far away from the switch shell by the existing casting method, the cross section area of a gap runner is small, aluminum alloy liquid is solidified before the casting at the position, the alloy liquid cannot supplement the switch shell, the casting quality defect of shrinkage cavity is caused to be frequently generated, the quality and the service life of the high-voltage switch shell are influenced, the yield of the casting is low, and the surface is not smooth.
Disclosure of Invention
The invention aims to overcome the technical defects and provides the casting method of the aluminum alloy ultra-high voltage switch shell for the gas insulated substation, which can ensure that the yield of the switch shell is high, the surface and the inner cavity are smooth and flat, and the construction is convenient.
The technical scheme adopted by the invention for solving the technical problem is as follows: the casting method of the aluminum alloy extra-high voltage switch shell for the gas insulated substation comprises the following tool equipment: an upper annular pouring gate single resin sand module, a lower annular pouring gate single resin sand module, a circulation template, a switch shell mould and a casting mould, it is characterized in that the upper annular runner is arranged on the upper annular runner single resin sand module, the outer edge of the upper annular runner is provided with an upper gap runner, an upper annular resin sand module riser is arranged above the upper annular pouring gate and the upper gap pouring gate, a lower annular pouring gate is arranged on the lower annular pouring gate individual resin sand module corresponding to the upper annular pouring gate of the upper annular pouring gate individual resin sand module, a lower molding gap pouring gate is arranged corresponding to the upper molding gap pouring gate, the amount of furan resin in the raw materials for manufacturing the casting core is 1 percent of the total weight of the sand mulling, the amount of the matched curing agent is 50 percent of the weight of the furan resin, and the balance is silica sand, and the raw materials are uniformly mixed by a double-arm continuous sand mulling machine; molding on the assembly line, wherein an upper annular runner combined module is formed by an upper annular runner individual resin sand module and a symmetrical part thereof, a lower annular runner combined module is formed by a lower annular runner individual resin sand module and a symmetrical part thereof, and the upper annular runner combined module is placed at a positioning position on the circulation molding plate to be fixed; opening an automatic sand mixer for discharging sand, putting the mixed resin sand into a cope box to start molding work, automatically transferring a transfer template to a compaction table for compaction after the sand discharging is finished to ensure that the resin sand is compacted, transferring the transfer template to rotate for one circle after the compaction, giving resin sand curing time, transferring to an automatic mold stripping machine to start mold stripping, transferring the cope box to a mold assembling process through a plate chain machine after the mold stripping to prepare for mold assembling; the middle box and the bottom box are manufactured in sequence in the same process;
casting mould assembling process: after the preparation of an upper box, a middle box and a bottom box of a sand mold is finished, the box assembling work is carried out, the casting system contained in the bottom box is a sprue and a cross runner, the middle box and the upper box form the appearance of a casting and contain corresponding casting systems, firstly, a sand core is placed to the middle box by a crane, the sand core is fixed by positioning a core head, then the upper box is lifted by the crane to be placed on the middle box, a mud strip is placed on a parting surface, the positioning is carried out by a positioning pin, and finally, the middle box and the upper box are lifted by the crane to be placed on the bottom box to finish the box assembling operation;
and (3) casting: the large and medium-sized castings of the aluminum alloy ultra-high voltage switch shell are mainly poured by gravity pouring or low-pressure pouring, and the bottom pouring type low-pressure pouring mode is mostly adopted for pouring at present for improving the tissue compactness. The locked sand box is lifted to a low-pressure pouring platform by a crane, an automatic liquid level pressurization control system is adopted to control pressure for low-pressure pouring, pouring liquid is injected into a bottom box sprue from a crucible in the pouring platform through a riser tube under the pressure and then flows into a cross gate from the sprue, alloy liquid is filled in the cross gate and then flows into a lower annular pouring gate combined module in a stable shunting manner, the alloy liquid continuously rises under pressure and flows into the upper annular pouring gate, the alloy liquid flows into the upper riser of the upper annular pouring gate along the upper annular pouring gate to provide the alloy liquid for the shrinkage of the casting, and the automatic liquid level pressurization control system maintains the pressure after the casting is filled, and the pouring is finished;
opening the mold and maintaining: and removing floating sand on the surface of the mold by using a hard brush after the use of the mold is finished, coating a release agent on the surface, hanging the mold to a mold placing position, and isolating the mold by using square timbers for protection.
The invention has the beneficial effects that: the casting method of the aluminum alloy extra-high voltage switch shell for the gas insulated substation can save nearly half of metal liquid for pouring, the yield is improved by about 10%, the energy consumption is reduced, the production efficiency is improved, and the integrity rate of sand molds is good. The problem of unstable process caused by artificial problems is solved by overcoming the original manual gap pouring gate process and barrel erecting tool, the redundant messy phenomenon and tool damage phenomenon of the tool in a production workshop are improved, and the limitation of the original operation method is avoided. The process is convenient to operate, the quality and the service life of the product are guaranteed, and the production efficiency is improved.
Drawings
The following description is made in detail by way of example with reference to the accompanying drawings.
FIG. 1 is a composition diagram of a single resin sand module of an upper pouring channel and a lower pouring channel in a casting method of an aluminum alloy extra-high voltage switch shell for a gas insulated substation.
FIG. 2 is a diagram of the arrangement form of an annular runner module and a mold in the casting method of the aluminum alloy ultra-high voltage switch shell for the gas insulated substation.
Fig. 3 is a top view of fig. 2.
FIG. 4 is a structural form diagram of the aluminum alloy ultra-high voltage switch shell for the gas insulated substation after casting and forming a mold and opening.
FIG. 5 is a flow chart of a casting process in the casting method of the aluminum alloy ultra-high voltage switch shell for the gas insulated substation.
Fig. 6 is a left side view of fig. 5.
In the figure, 1-up ring runner single resin sand module; 1-1-upper annular resin sand module riser; 1-2-upper annular runner; 1-3-upper type gap pouring channel; 2-lower annular pouring gate single resin sand module; 2-1-lower annular pouring channel; 2-2-lower type gap pouring channel; 3-a circulation template; 4-opening and closing the shell mold; 5-upper annular pouring gate combined module; 6-casting mould; 6-1-annular pouring channel II; 6-2-gap pouring channel II; 7-switch housing casting; 8-annular pouring channel III; 9-upper riser; 10-gap pouring gate III; 11-cross gate; 12-straight pouring channel; 13-lower ring runner segment.
Detailed Description
In the embodiment, referring to attached figures 1-6, the casting method of the aluminum alloy ultra-high voltage switch shell for the gas insulated substation is that an upper annular pouring gate 1-2 is arranged on an upper annular pouring gate single resin sand module 1, an upper gap pouring gate 1-3 is arranged at the outer edge of the upper annular pouring gate 1-2, and an upper annular resin sand module riser 1-1 is arranged above the upper annular pouring gate 1-1 and the upper gap pouring gate 1-3. And a lower annular pouring gate 2-1 is arranged on the lower annular pouring gate individual resin sand module 2 corresponding to the upper annular pouring gate 1-2 of the upper annular pouring gate individual resin sand module 1, and a lower annular gap pouring gate 2-2 is arranged corresponding to the upper annular gap pouring gate 1-3. The furan resin content of the raw materials for making the core is 1 percent of the total weight of the sand mixture, the dosage of the matched curing agent is 50 percent of the weight of the furan resin, and the rest is silica sand, and the raw materials are uniformly mixed by a double-arm continuous sand mixer and are shaped on a production line. An upper annular runner combined module 5 is formed by an upper annular runner individual resin sand module 1 and a symmetrical part thereof, a lower annular runner individual resin sand module 2 and a symmetrical part thereof form a lower annular runner combined module 13, and the upper annular runner combined module 5 is placed on a positioning position on a circulation template 3 for fixing; opening an automatic sand mixer for sand discharging, putting the mixed resin sand into a cope box, starting to mold a switch shell mold 4, automatically flowing a flow template 3 to a compaction table for compaction after the sand discharging is finished, ensuring that the resin sand is compacted, flowing the flow template 3 for one circle after the compaction, giving the resin sand curing time, turning to an automatic mold stripping machine for mold stripping, and flowing the cope box to a box closing process through a plate chain machine for box closing preparation after the mold stripping; the middle box and the bottom box are manufactured in sequence in the same process;
casting mould assembling process: after the preparation of an upper box, a middle box and a bottom box of a sand mold is finished, the box assembling work is carried out, the casting system contained in the bottom box is a sprue 12 and a cross runner 11, the middle box and the upper box form the appearance of a casting and contain corresponding casting systems, firstly, a sand core is placed to the middle box by using a crane, the sand core is fixed by positioning a core head, then the upper box is lifted by using the crane to place the upper box on the middle box, a mud strip is placed at the parting surface position, the positioning is carried out by using a positioning pin, and finally, the middle box and the upper box are lifted by using the crane to place the middle box and the upper box on the bottom box to finish the box assembling;
and (3) casting: the large and medium-sized castings of the aluminum alloy ultra-high voltage switch shell are mainly poured by gravity pouring or low-pressure pouring, and the bottom pouring type low-pressure pouring mode is mostly adopted for pouring at present for improving the tissue compactness. Hoisting the locked sand box to a low-pressure pouring platform by a crane, controlling the pressure by adopting an automatic liquid level pressurization control system to perform low-pressure pouring, injecting pouring liquid into a bottom box sprue 12 from a crucible in the pouring platform through a riser tube under the pressure, then flowing into a cross runner 11 from the sprue 12, shunting and stably flowing into a lower annular runner combined module 13 after the cross runner 11 is filled with the alloy liquid, flowing into a casting mold 6 through a lower annular gap runner 2-2 of a lower annular runner 2-1 to perform mold filling pouring on the casting, continuously rising the alloy liquid under the pressure to flow into an upper annular runner 1-2, flowing into the casting mold 6 through an upper annular gap runner 1-3 of the upper annular runner 1-2 to perform mold filling pouring on the casting, and finally flowing the alloy liquid into an upper riser 9 of the upper annular runner 1-2 along the upper annular runner 1-2 to provide the alloy liquid for the shrinkage of the casting, after the casting mold 6 is filled, the automatic liquid level pressurization control system carries out pressure maintaining, and the pouring is finished;
opening the mold and maintaining: and removing floating sand on the surface of the mold by using a hard brush after the use of the mold is finished, coating a release agent on the surface, hanging the mold to a mold placing position, and isolating the mold by using square timbers for protection.
The working principle of the invention is as follows: the casting method of the aluminum alloy ultra-high voltage switch shell for the gas insulated substation adopts the annular pouring channel and forms modularization, the combined modules are placed at corresponding positions in the molding process to complete the molding operation, and the product quality of the switch shell 4 is greatly improved through the annular pouring channel and the gap pouring channel.
Claims (1)
1. A casting method of an aluminum alloy extra-high voltage switch shell for a gas insulated substation comprises the following tool equipment: an upper annular pouring gate individual resin sand module (1), a lower annular pouring gate individual resin sand module (2), a circulation template (3), a switch shell mold (4) and a casting mold (6), and is characterized in that the upper annular pouring gate (1-2) is arranged on the upper annular pouring gate individual resin sand module (1), an upper annular gap pouring gate (1-3) is arranged at the outer edge of the upper annular pouring gate (1-2), an upper annular resin sand module riser (1-1) is arranged above the upper annular pouring gate (1-2) and the upper annular gap pouring gate (1-3), a lower annular pouring gate (2-1) is arranged at the position, corresponding to the upper annular pouring gate (1-2) of the upper annular pouring gate individual resin sand module (1), on the lower annular pouring gate individual resin sand module (2), and a lower annular gap pouring gate (2-2) is arranged corresponding to the upper annular gap pouring gate (1-3), the furan resin content in the raw material for manufacturing the core of the casting mold (6) is 1 percent of the total weight of the sand mixer, the dosage of the matched curing agent is 50 percent of the weight of the furan resin, and the rest is silica sand, and the raw materials are uniformly mixed by a double-arm continuous sand mixer; molding on the assembly line, wherein an upper annular pouring gate combined module (5) is formed by an upper annular pouring gate single resin sand module (1) and a symmetrical part thereof, a lower annular pouring gate combined module (1-3) is formed by a lower annular pouring gate single resin sand module (2) and a symmetrical part thereof, and the upper annular pouring gate combined module (5) is placed on a positioning position on a circulation molded plate (3) for fixing; opening an automatic sand mixer for discharging sand, putting the mixed resin sand into a cope box to start molding work, automatically transferring a transfer template (3) to a compaction table for compaction after the sand discharging is finished to ensure that the resin sand is compacted, transferring the transfer template (3) for one circle after the compaction, giving the resin sand curing time, transferring to an automatic mold stripping machine to start mold stripping, and transferring the cope box to a box assembling process through a plate chain machine after the mold stripping to prepare for box assembling; the middle box and the bottom box are manufactured in sequence in the same process;
casting mould assembling process: after the preparation of an upper box, a middle box and a bottom box of a sand mold is finished, the box assembling work is carried out, the casting systems contained in the bottom box are a sprue (12) and a cross runner (11), the middle box and the upper box form the appearance of a casting and contain corresponding casting systems, firstly, a sand core is placed to the middle box by using a crane, the sand core is fixed by positioning a core head, then the upper box is lifted by using the crane to place the upper box on the middle box, a mud strip is placed at the parting surface position, the positioning is carried out by using a positioning pin, and finally, the middle box and the upper box are lifted by using the crane together to be placed on the bottom box, so that the box assembling operation is finished;
and (3) casting: the large and medium-sized castings of the aluminum alloy ultra-high voltage switch shell are mainly poured by gravity pouring or low-pressure pouring, and the bottom pouring type low-pressure pouring mode is mostly adopted at present for pouring in order to improve the tissue compactness; the locked sand box is lifted to a low-pressure pouring platform by a crane, an automatic liquid level pressurization control system is adopted to control pressure to perform low-pressure pouring, pouring liquid is injected into a bottom box sprue (12) from a crucible in the pouring platform through a riser tube under the pressure, then flows into a cross runner (11) through the sprue (12), is distributed stably after filling the cross runner with alloy liquid, flows into a lower annular runner combined module (13), flows into a casting (6) through a lower annular gap runner (2-2) of a lower annular runner (2-1) to perform mold filling pouring on the casting (7), the alloy liquid continuously rises under the pressure, flows into an upper annular runner (1-2), flows into the casting (6) through an upper annular gap runner (1-3) of the upper annular runner (1-2) to continuously perform mold filling pouring on the casting (7), and finally flows into an upper mold of the upper annular runner (1-2) along the upper annular runner (1-2) Alloy liquid is provided for the shrinkage of the casting in the riser (9), and after the casting mold (6) is filled, an automatic liquid level pressurization control system maintains pressure, and the pouring is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011420926.8A CN112496303A (en) | 2020-12-08 | 2020-12-08 | Casting method of aluminum alloy extra-high voltage switch shell for gas insulated substation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011420926.8A CN112496303A (en) | 2020-12-08 | 2020-12-08 | Casting method of aluminum alloy extra-high voltage switch shell for gas insulated substation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114406200A (en) * | 2022-02-10 | 2022-04-29 | 鞍钢重型机械有限责任公司 | Casting system formed by adopting modular sand core casting pipes |
| CN114603085A (en) * | 2022-03-30 | 2022-06-10 | 莱芜市万金机械有限公司 | Aluminum-magnesium alloy supporting cylinder sand core of high-voltage switch and manufacturing process thereof |
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| CN101497121A (en) * | 2008-01-31 | 2009-08-05 | 上海爱仕达汽车零部件有限公司 | Diesel motor aluminium alloy cylinder metal mould low-pressure casting method |
| CN202343915U (en) * | 2011-11-28 | 2012-07-25 | 中国西电电气股份有限公司 | Cast die for aluminum alloy current transformer (CT) shell for high-voltage switch |
| CN102941333A (en) * | 2012-10-12 | 2013-02-27 | 南阳市汇森精密仪器铸造有限公司 | Method for producing ultrahigh pressure switch pressure-bearing aluminum alloy tanks under low pressure through V method |
| CN103008612A (en) * | 2012-11-15 | 2013-04-03 | 北京航星机器制造公司 | Multi-element combined-type low-pressure pouring method and combined-type sand core |
| CN104741542A (en) * | 2013-12-26 | 2015-07-01 | 贵州航天风华精密设备有限公司 | Casting method of girder having thin-walled cylinder and casting mold |
| CN204842919U (en) * | 2015-07-06 | 2015-12-09 | 辽宁卡斯特金属材料发展有限公司 | Rotor plate the gating system |
| US10618108B2 (en) * | 2015-06-05 | 2020-04-14 | Oskar Frech Gmbh + Co. Kg | Hot runner feed system for a diecasting mould |
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2020
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| CN1597179A (en) * | 2004-08-20 | 2005-03-23 | 新东北电气(沈阳)高压开关有限公司 | Mould and method for preparation high-pressure switch cast aluminium can |
| CN101497121A (en) * | 2008-01-31 | 2009-08-05 | 上海爱仕达汽车零部件有限公司 | Diesel motor aluminium alloy cylinder metal mould low-pressure casting method |
| CN202343915U (en) * | 2011-11-28 | 2012-07-25 | 中国西电电气股份有限公司 | Cast die for aluminum alloy current transformer (CT) shell for high-voltage switch |
| CN102941333A (en) * | 2012-10-12 | 2013-02-27 | 南阳市汇森精密仪器铸造有限公司 | Method for producing ultrahigh pressure switch pressure-bearing aluminum alloy tanks under low pressure through V method |
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| CN104741542A (en) * | 2013-12-26 | 2015-07-01 | 贵州航天风华精密设备有限公司 | Casting method of girder having thin-walled cylinder and casting mold |
| US10618108B2 (en) * | 2015-06-05 | 2020-04-14 | Oskar Frech Gmbh + Co. Kg | Hot runner feed system for a diecasting mould |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114406200A (en) * | 2022-02-10 | 2022-04-29 | 鞍钢重型机械有限责任公司 | Casting system formed by adopting modular sand core casting pipes |
| CN114603085A (en) * | 2022-03-30 | 2022-06-10 | 莱芜市万金机械有限公司 | Aluminum-magnesium alloy supporting cylinder sand core of high-voltage switch and manufacturing process thereof |
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