CN109822088B - Large-scale high-temperature high-strength material vacuum precision casting equipment - Google Patents
Large-scale high-temperature high-strength material vacuum precision casting equipment Download PDFInfo
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- CN109822088B CN109822088B CN201910287579.7A CN201910287579A CN109822088B CN 109822088 B CN109822088 B CN 109822088B CN 201910287579 A CN201910287579 A CN 201910287579A CN 109822088 B CN109822088 B CN 109822088B
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- 238000005495 investment casting Methods 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 title claims abstract description 10
- 238000003723 Smelting Methods 0.000 claims abstract description 95
- 230000007246 mechanism Effects 0.000 claims abstract description 70
- 238000009416 shuttering Methods 0.000 claims abstract description 61
- 238000013519 translation Methods 0.000 claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000002955 isolation Methods 0.000 claims abstract description 13
- 238000004891 communication Methods 0.000 claims abstract description 8
- 238000009415 formwork Methods 0.000 claims description 15
- 238000005266 casting Methods 0.000 abstract description 26
- 238000010438 heat treatment Methods 0.000 abstract description 14
- 238000010924 continuous production Methods 0.000 abstract description 5
- 229910045601 alloy Inorganic materials 0.000 description 15
- 239000000956 alloy Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention belongs to the field of precision casting equipment, and particularly relates to large-scale high-temperature high-strength material vacuum precision casting equipment, which comprises a smelting chamber (1), a mould shell chamber (2), a smelting coil (5), a mould shell heater (6), a mould shell vehicle (9), a smelting chamber vacuum system (12) and a mould shell chamber vacuum system (13); the smelting chamber (1) is fixedly connected with the mould shell chamber (2); a communication port (801) is arranged between the smelting chamber (1) and the mould shell chamber (2); the smelting coil (5) and the mould shell heater (6) are arranged in the smelting chamber (1); a water-cooling isolation valve (8) is arranged at the upper part of the cavity of the mould shell chamber (2); the smelting coil (5) is fixedly connected with the translation overturning structure; the shuttering vehicle (9) is arranged outside the shuttering room (2); a pushing mechanism is fixedly arranged at the rear end of the furnace door (901); a shuttering (11) is arranged on the shuttering tray (16). The invention has the advantages of high heating speed and long service life, and is suitable for continuous production of large castings.
Description
Technical Field
The invention belongs to the field of precision casting equipment, and particularly relates to large-scale high-temperature high-strength material vacuum precision casting equipment. The equipment can be used for producing the isometric crystal precision castings of large-scale high-temperature alloys with the weight of more than 100 kg.
Background
The vacuum precision casting equipment is special metallurgical equipment for precision casting under vacuum or protective atmosphere, and is mainly used for large-size high-temperature alloy precision castings. The traditional vacuum precision casting furnace adopts a vertical double-chamber structure, a mould shell chamber is arranged below, and a smelting chamber is arranged above. The melting chamber is used for the inductor to remelt the base metal alloy for the second time, and a set of die shell heating system is also needed in the melting chamber. Pouring the molten metal in the crucible into the mould shell after the secondary remelting is finished, and enabling the mould shell to move downwards at a certain speed according to different processes. Until the smelting chamber is completely removed, the two chambers are sealed and separated by a water-cooling isolating valve. The shuttering chamber is broken and a new shuttering is loaded. The melting chamber also feeds new alloy through the feed mechanism for the next cycle.
The traditional vacuum precision casting furnace adopts a vertical double-chamber knot, and a set of vertical mould shell transmission mechanism is needed for realizing the transfer of the mould shell from a lower chamber (mould shell chamber) to an upper chamber (smelting chamber). The set of mechanism needs to occupy the distance in the vertical direction, so that a pit with the depth of about 3-4 m is often dug on the ground of a furnace body in the traditional vacuum precision casting furnace for accommodating the traditional mechanism of the mould shell; the vacuum precision casting furnace is generally not provided with a mould shell heater according to the technological requirements, but when the mould shell is increased, the temperature of the mould shell is reduced more before casting, so that the casting technological process is not utilized. Meanwhile, due to the increase of the size of the mould shell, the smelting coil is at a higher position above the mould shell (or the mould shell heater) in order not to generate mechanical interference with the mould shell, and the stability of liquid flow in the casting process is not controlled by the excessively high distance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide large-scale high-temperature high-strength material vacuum precision casting equipment which has the advantages of high heating speed, long service life and high casting efficiency and can be suitable for continuous production of large-scale castings.
In order to solve the technical problems, the invention is realized as follows:
A large-scale high-temperature high-strength material vacuum precision casting device comprises a smelting chamber, a die-shell chamber, a smelting coil, a die-shell heater, a die-shell vehicle, a smelting chamber vacuum system and a die-shell chamber vacuum system; the smelting chamber is transversely and fixedly connected with the mould shell chamber; a communication port is arranged between the smelting chamber and the mould shell chamber; the smelting coil and the mould shell heater are arranged in the smelting chamber; a water-cooling isolation valve is longitudinally arranged at the upper part of the shuttering chamber cavity; the water-cooling isolation valve can longitudinally move along the outer wall of the smelting chamber to realize the switching of the communicating port; a heater lifting mechanism is longitudinally arranged in the cavity of the smelting chamber; the shuttering heater is fixedly connected with a lifting component of the heater lifting mechanism; a heater lifting driving unit is fixedly arranged at the top of the smelting chamber; the power output end of the heater lifting driving unit is fixedly connected with the power input end of the heater lifting mechanism; the smelting coil is fixedly connected with the translation overturning structure; the shuttering vehicle is arranged outside the shuttering room; a furnace door is longitudinally and fixedly arranged on the shuttering vehicle; a shuttering translation mechanism is arranged at the front end of the furnace door; a pushing mechanism is transversely and fixedly arranged at the rear end of the furnace door on the formwork car; the working end of the pushing mechanism is fixedly connected with the end part of the shuttering translation mechanism; a shuttering tray is fixedly arranged on the shuttering translation mechanism; the shuttering tray is provided with a shuttering.
As a preferable scheme, the invention is characterized in that a feeding mechanism and a temperature measuring mechanism are fixedly arranged on the smelting chamber; a temperature thermocouple is fixedly arranged at the lower part of the temperature measuring mechanism; the temperature measuring mechanism adopts a longitudinal telescopic structure.
Further, the pushing mechanism adopts a hydraulic cylinder; the end part of the push rod in the hydraulic cylinder is fixedly connected with the end part of the mould shell translation mechanism.
The invention has the advantages of high heating speed, long service life and high casting efficiency, and is suitable for continuous production of large castings. The invention uses horizontal layout, has no pit design, and is very suitable for the precise casting process of large-scale mould shells. The invention adopts the induction heating type mould shell heater, and has the characteristics of high heating speed, durability and the like compared with the traditional resistance heating mode.
The invention adopts the continuous design of a horizontal double-chamber structure. The smelting chamber is mainly used for secondary smelting of master alloy, master alloy charging and temperature measurement, mould shell heating, mould shell casting and the like. The shuttering room is mainly used for shuttering in air-receiving non-vacuum state or waiting for cooling of hot mold. In order to ensure the precise casting process with the large capacity (100 kg), a large-size translatable smelting coil system is adopted, the translation function not only ensures that mechanical interference is not generated with a large-size mould shell heater, but also can realize the casting of a preset curve through the translation function, and the casting quality is greatly improved.
Compared with the prior art, the invention has three main advantages:
1. the horizontal double-chamber structure is adopted, no pit is arranged, and the requirements on the field are small;
2. The water-cooling isolation valve is adopted to isolate the smelting chamber from the mould shell chamber, and the smelting chamber is ensured to be kept in a vacuum state in a plurality of production cycles by matching with the feeding bin and the temperature measuring mechanism, so that the equipment has a continuous production function;
3. the device has the functions of a large-size mould shell heater and smelting coil translation, and is suitable for a precise casting process of the large-size mould shell.
Drawings
The invention is further described below with reference to the drawings and the detailed description. The scope of the present invention is not limited to the following description.
FIG. 1 is a schematic diagram of the overall structure of the present invention.
In the figure: 1. a smelting chamber; 2. a formwork chamber; 3. a charging mechanism; 4. a temperature measuring mechanism; 5. smelting a coil; 6. a form heater; 7. a heater lifting mechanism; 701. a lifting member; 8. a water-cooled isolation valve; 801. a communication port; 9. a formwork vehicle; 10. a formwork translation mechanism; 11. a mould shell; 12. a melting chamber vacuum system; 13. a form housing vacuum system; 14. a hydraulic cylinder; 15. a heater lifting driving unit; 16. a formwork tray; 17. a temperature thermocouple.
Detailed Description
As shown in the figure, the large-scale high-temperature high-strength material vacuum precision casting equipment comprises a smelting chamber 1, a die-shell chamber 2, a smelting coil 5, a die-shell heater 6, a die-shell vehicle 9, a smelting chamber vacuum system 12 and a die-shell chamber vacuum system 13; the smelting chamber 1 is transversely fixedly connected with the mould shell chamber 2; a communication port 801 is arranged between the smelting chamber 1 and the mould shell chamber 2; the smelting coil 5 and the mould shell heater 6 are arranged in the smelting chamber 1; a water-cooling isolation valve 8 is longitudinally arranged at the upper part of the cavity of the formwork chamber 2; the water-cooling isolation valve 8 can longitudinally move along the outer wall of the smelting chamber 1 to realize the switching of the communication port 801; a heater lifting mechanism 7 is longitudinally arranged in the cavity of the smelting chamber 1; the shuttering heater 6 is fixedly connected with a lifting part 701 of a heater lifting mechanism 7; a heater lifting driving unit 15 is fixedly arranged at the top of the smelting chamber 1; the power output end of the heater lifting driving unit 15 is fixedly connected with the power input end of the heater lifting mechanism 7; the smelting coil 5 is fixedly connected with the translation overturning structure; the shuttering vehicle 9 is arranged outside the shuttering room 2; a furnace door 901 is longitudinally and fixedly arranged on the shuttering vehicle 9; a shuttering translation mechanism 10 is arranged at the front end of the furnace door 901; a pushing mechanism is transversely and fixedly arranged at the rear end of the furnace door 901 on the shuttering vehicle 9; the working end of the pushing mechanism is fixedly connected with the end part of the shuttering translation mechanism 10; a shuttering tray 16 is fixedly arranged on the shuttering translation mechanism 10; a formwork 11 is provided on the formwork tray 16.
The invention is characterized in that a feeding mechanism 3 and a temperature measuring mechanism 4 are fixedly arranged on a smelting chamber 1; a temperature thermocouple 17 is fixedly arranged at the lower part of the temperature measuring mechanism 4; the temperature measuring mechanism 4 adopts a longitudinal telescopic structure. The pushing mechanism adopts a hydraulic cylinder 14; the end of the push rod 1401 in the hydraulic cylinder 14 is fixedly connected with the end of the shuttering shifting mechanism 10.
Referring to fig. 1, the main structure of the invention comprises a smelting chamber 1, a die-shell chamber 2, a feeding mechanism 3, a temperature measuring mechanism 4, a smelting coil 5, a die-shell heater 6, a heater lifting mechanism 7, a water-cooling isolation valve 8, a die-shell vehicle 9, a die-shell translation mechanism 10, a die-shell 11, a smelting chamber vacuum system 12 and a die-shell chamber vacuum system 13, and the technical characteristics form a horizontal double-chamber vacuum furnace structure. Wherein the smelting chamber 1 and the mould shell chamber 2 are of welded structure and form a furnace body part together. The smelting coil 5 and the mould shell heater 6 are arranged in the smelting chamber 1, and the smelting chamber 1 and the mould shell chamber 2 are respectively provided with an independent furnace door for installation and casting operation. The water-cooling isolating valve 8 is arranged in the cavity of the mould shell chamber 2 and is used for sealing the smelting chamber 1 and the mould shell chamber 2, and the water-cooling isolating valve 8 adopts a water-cooling structure to prevent the valve plate from deforming in a thermal state for a long time. The smelting coil 5 has both overturning casting function and translation function, and can ensure stable casting curve. The shuttering heater 6 adopts an induction heating mode, and the up-and-down lifting function of the shuttering heater 6 is realized through the heater lifting mechanism 7 and the heater lifting driving unit 15.
The shuttering vehicle 9 is arranged outside the shuttering room 2, and has two main functions, namely, a furnace door function serving as the shuttering room 2, ensuring that the shuttering 11 enters the shuttering room 2, and a carrier serving as a shuttering translation mechanism 10, a hydraulic cylinder 14 and a shuttering tray 16, which together complete the smooth transportation of the shuttering 11 to a designated position in the smelting room 1, namely, directly below the shuttering heater 6. The temperature measuring mechanism 4 is positioned on the smelting chamber 2, the smelting coil 5 is horizontally moved right above the initial position, and the temperature measuring thermocouple 17 is immersed into the mother alloy melt which is being smelted through the mechanism of the temperature measuring mechanism to carry out smelting temperature measuring operation.
The invention adopts a horizontal pit-free structure, and has small requirements on the field; the smelting chamber and the mould shell chamber are separated by an isolating valve by adopting a double-chamber layout, and the two chambers are respectively provided with a vacuum system which can be independently evacuated. The smelting coil has a translation function. The shuttering heater has up-down lifting function.
The invention adopts a horizontal non-pit layout and a double-chamber continuous structure, so that main working units such as a mould shell heater, a smelting coil and the like in a smelting chamber are kept in a vacuum thermal state, and the equipment has continuous operation capability. By adopting the horizontal double-chamber layout, the two furnace chambers are separated by the isolating valve, so that the smelting chamber can be kept in a vacuum thermal state under a continuous working state.
The invention adopts the smelting coil which can translate, and the coil is positioned at the smelting position during smelting, so that the operations of temperature measurement, charging and the like can be performed. During casting, the smelting coil is translated to a casting position, and can be matched with a casting curve to perform translation motion. The invention adopts the mould shell heater with lifting function, when the mould shell moves to the appointed position of the smelting chamber, the heater moves downwards to completely cover the mould shell and heat the mould shell, and when heating to be cast is completed, the heater can move upwards to the initial position rapidly without interfering with the casting operation of the translation coil.
Summary of the operation flow of the device:
1. Preparing the alloy and the mould shell, performing routine inspection on the equipment, feeding back the functions of all parts normally, and starting the equipment after abnormal alarm is not generated;
2. placing a master alloy in a crucible of a smelting coil 5, and placing a mould shell 11 on a mould shell tray 16;
3. The water-cooling isolation valve 8 is in a closed state, the furnace door is closed, and the smelting chamber 1 and the die-shell chamber 2 are vacuumized respectively through the smelting chamber vacuum system 12 and the die-shell chamber vacuum system 13;
4. after the vacuum degree of the smelting chamber 1 reaches a specified value, the mould shell heater 6 is electrified, and the heating operation is carried out according to a preset program;
5. After the smelting chamber 1 and the mould shell chamber 2 reach a specified vacuum degree, the water-cooling isolation valve 8 is opened, and the smelting chamber 1 is communicated with the mould shell chamber 2;
6. The shuttering translation mechanism 10 works, and the hydraulic cylinder 14 drives the shuttering tray 16 to move the shuttering 11 to a designated position of the smelting chamber 1, which is usually right below the shuttering heater 6;
7. the heater lifting mechanism 7 works, the heater lifting driving unit 15 provides power to lower the mould shell heater 6 to a designated position, the mould shell 11 is covered, and the mould shell 11 is heated;
8. When the mould shell 11 reaches a preset temperature and is preserved for a period of time according to the process, an intermediate frequency power supply is started to electrify the smelting coil 5 in a high power mode, and at the moment, the master alloy is melted. At this time, the temperature measuring mechanism 4 can be used for immersing the temperature thermocouple 17 into the master alloy melt for temperature measuring operation. When the master alloy melt reaches the specified temperature and has casting conditions, the temperature measuring mechanism 4 must withdraw the temperature measuring thermocouple 17 into the mechanism;
9. The smelting coil 5 translates according to a preset program to a designated casting position, and a preset casting curve is set to cast the master alloy melt into the mould shell 11;
10. after standing for a plurality of minutes, the shuttering heater 6 is lifted to an initial position above the shuttering 11 by the heater lifting mechanism 7 and the heater lifting driving unit 15, so as to prevent mechanical collision when the shuttering 11 translates. Simultaneously, the smelting coil 5 is restored to the overturning 0 position and is translated to the smelting position (translation initial position);
11. The shuttering translation mechanism 10 works, the hydraulic cylinder 14 drives the shuttering tray 16 to move the shuttering 11 to the designated position of the shuttering room 2, and the water cooling isolation valve 8 is closed to isolate the smelting room 1 and the shuttering room 2;
12. standing for a certain time according to the process requirement, closing a vacuumizing valve by a formwork chamber vacuum system 13 after the formwork is cooled to a certain temperature, carrying out the emptying operation of the formwork chamber 2, moving the formwork vehicle 9 outwards, and completely leaving the formwork 11 from the formwork chamber 2;
13. taking out the mould shell 11, and adding new master alloy into the smelting coil 5 through the feeding mechanism 3 under the condition of not breaking vacuum;
14. The steps 2-13 are repeated, and a continuous production process can be realized.
The invention is used for producing the isometric crystal precision castings of large-scale high-temperature alloys with the weight of more than 100 kg. The invention relates to a vacuum precision casting furnace with a capacity of more than 100kg (containing 100 kg), which has the characteristics of translation of a smelting coil, lifting of a mould shell heater, suitability for large castings, quick production beat and the like. The invention uses a horizontal layout and has no pit design. Is very suitable for the precise casting process of large-scale mould shells. The die shell heater in the induction heating mode has the characteristics of high heating speed, firmness, durability and the like compared with the traditional resistance heating mode. The invention can be applied to the aerospace field and other industries such as gas turbines and the like which need high-temperature alloy precision castings.
In the present invention, unless explicitly specified and limited otherwise, the terms "disposed," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The large-scale high-temperature high-strength material vacuum precision casting equipment is characterized by comprising a smelting chamber (1), a die-shell chamber (2), a smelting coil (5), a die-shell heater (6), a die-shell vehicle (9), a smelting chamber vacuum system (12) and a die-shell chamber vacuum system (13); the smelting chamber (1) is transversely fixedly connected with the mould shell chamber (2); a communication port (801) is arranged between the smelting chamber (1) and the mould shell chamber (2); the smelting coil (5) and the mould shell heater (6) are arranged in the smelting chamber (1); a water-cooling isolation valve (8) is longitudinally arranged at the upper part of the cavity of the formwork chamber (2); the water-cooling isolation valve (8) can longitudinally move along the outer wall of the smelting chamber (1) to realize the switching of the communication port (801); a heater lifting mechanism (7) is longitudinally arranged in the cavity of the smelting chamber (1); the shuttering heater (6) is fixedly connected with a lifting component (701) of a heater lifting mechanism (7); a heater lifting driving unit (15) is fixedly arranged at the top of the smelting chamber (1); the power output end of the heater lifting driving unit (15) is fixedly connected with the power input end of the heater lifting mechanism (7); the smelting coil (5) is fixedly connected with the translation overturning structure; the shuttering vehicle (9) is arranged outside the shuttering room (2); a furnace door (901) is longitudinally and fixedly arranged on the shuttering vehicle (9); the front end of the furnace door (901) is provided with a mould shell translation mechanism (10); a pushing mechanism is transversely and fixedly arranged at the rear end of the furnace door (901) on the shuttering vehicle (9); the working end of the pushing mechanism is fixedly connected with the end part of the shuttering translation mechanism (10); a shuttering tray (16) is fixedly arranged on the shuttering translation mechanism (10); a mould shell (11) is arranged on the mould shell tray (16); the temperature measuring mechanism (4) is positioned on the smelting chamber (1), and the smelting coil (5) is directly above the translation initial position.
2. The large-scale high-temperature high-strength material vacuum precision casting apparatus according to claim 1, wherein: a feeding mechanism (3) and a temperature measuring mechanism (4) are fixedly arranged on the smelting chamber (1); a temperature thermocouple (17) is fixedly arranged at the lower part of the temperature measuring mechanism (4); the temperature measuring mechanism (4) adopts a longitudinal telescopic structure.
3. The large-scale high-temperature high-strength material vacuum precision casting apparatus according to claim 2, wherein: the pushing mechanism adopts a hydraulic cylinder (14); the end part of a push rod (1401) in the hydraulic cylinder (14) is fixedly connected with the end part of the mould shell translation mechanism (10).
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| CN201910287579.7A CN109822088B (en) | 2019-04-11 | 2019-04-11 | Large-scale high-temperature high-strength material vacuum precision casting equipment |
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| CN201910287579.7A CN109822088B (en) | 2019-04-11 | 2019-04-11 | Large-scale high-temperature high-strength material vacuum precision casting equipment |
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| CN110814326B (en) * | 2019-11-13 | 2022-03-08 | 中国航发动力股份有限公司 | Formwork adjusting tool for vacuum solidification furnace and using method |
| CN112548082B (en) * | 2021-02-19 | 2021-05-11 | 上海鑫蓝海自动化科技有限公司 | Mould shell lifting device of vacuum precision casting furnace |
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| JP2000317627A (en) * | 1999-05-10 | 2000-11-21 | Shinko Electric Co Ltd | Vacuum induction furnace equipment |
| JP2007203311A (en) * | 2006-01-31 | 2007-08-16 | Daido Steel Co Ltd | Apparatus for producing magnesium alloy cast billet |
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| CN106180641A (en) * | 2015-02-10 | 2016-12-07 | 金英熙 | Liquid forging shaped device |
| CN209830260U (en) * | 2019-04-11 | 2019-12-24 | 沈阳真空技术研究所有限公司 | Large-scale high-temperature high-strength material vacuum precision casting equipment |
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2019
- 2019-04-11 CN CN201910287579.7A patent/CN109822088B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000317627A (en) * | 1999-05-10 | 2000-11-21 | Shinko Electric Co Ltd | Vacuum induction furnace equipment |
| JP2007203311A (en) * | 2006-01-31 | 2007-08-16 | Daido Steel Co Ltd | Apparatus for producing magnesium alloy cast billet |
| CN101352755A (en) * | 2008-09-18 | 2009-01-28 | 冬燕 | Equipment and technique for ladle-to-ladle, degasification and vacuum ingot casting of multiple-slide runner ladle |
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| CN105492141A (en) * | 2014-07-17 | 2016-04-13 | 株式会社东热 | Two chamber molten metal holding furnace for low-pressure casting |
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