CN209867337U - Four-chamber directional/single crystal vacuum induction furnace equipment with double-module shell chamber - Google Patents
Four-chamber directional/single crystal vacuum induction furnace equipment with double-module shell chamber Download PDFInfo
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- CN209867337U CN209867337U CN201920308950.9U CN201920308950U CN209867337U CN 209867337 U CN209867337 U CN 209867337U CN 201920308950 U CN201920308950 U CN 201920308950U CN 209867337 U CN209867337 U CN 209867337U
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Abstract
The utility model protects four-chamber directional/single crystal vacuum induction furnace equipment with double-mold shell chambers, which comprises a furnace body, a casting device, a vacuum system, a smelting power supply, a mold shell heating power supply and a cooling system; the furnace body is a communicated vertical four-chamber structure consisting of a feeding chamber, a casting chamber, a first mold shell chamber and a second mold shell chamber; the casting device is arranged on the door wall of the casting chamber; the vacuum system is connected with the casting chamber, the first formwork chamber and the side wall of the second formwork chamber in a seamless mode; the smelting power supply is connected with the casting device; the casting device of the utility model can realize casting of the left and right formworks, and can move horizontally and accurately and automatically center; a set of casting device carries out secondary quantitative casting of the formworks in the left direction and the right direction respectively by using the alloy liquid smelted for the first time; the two sets of the mould shell induction heaters, the two sets of the crystallization trays and the two sets of the mould shell lifting and pulling mechanisms can realize the simultaneous pulling of single crystal/directional high-temperature blades of the two mould shells, have advanced structures and can improve the production efficiency by one time compared with the original equipment.
Description
Technical Field
The utility model belongs to the field of vacuum precision casting, which is mainly applied to the production of single crystal/directional blades of aerospace engines and gas turbines; in particular to a four-chamber directional/single crystal vacuum induction furnace device with a double-module shell chamber.
Background
The single crystal/directional high temperature alloy precision casting blade of aeroengine and gas turbine is generally vacuum cast by directional/single crystal vacuum precision casting furnace, at present, domestic and international popular is to use three-chamber vacuum induction furnace with single-mould shell chamber, the mould shell chamber is under, the casting room is above, the casting room contains 1 set of mould shell induction heater and induction melting crucible, when the single crystal/directional high temperature alloy blade precision casting is carried out, the mould shell is lifted to the mould shell induction heater, the mould shell induction heater heats the mould shell according to the set temperature rising curve, the final set temperature is reached (the temperature is over the alloy melting point), the temperature is preserved, the single crystal mother alloy is added to the induction melting crucible for secondary remelting, the alloy liquid in the crucible is poured into the mould shell after the completion, the mould shell pulls the single crystal/directional high temperature alloy blade according to the set pulling speed, the pulling speed is 2 ~ 5mm/min under the water cooling medium, until the pulling is completed, the mould shell is directionally solidified and cooled in the vacuum state in the mould shell chamber, the mould shell chamber is broken and a new feeding cycle is started through the feeding chamber.
The working time of each procedure of the traditional three-chamber directional/single crystal vacuum precise casting furnace is not uniform, particularly the formwork heating, drawing cooling and vacuum cooling occupy 4 ~ 5 hours, at the moment, the casting chamber and the feeding chamber are vacant and do not work, the equipment cost is high, and the working efficiency is low.
Disclosure of Invention
The utility model aims at overcoming the prior art weak point and providing one kind and can realize that a set of mould shell is when carrying out mould shell pull and vacuum cooling, and another group of mould shell can carry out mould shell heating, smelt, casting, mould shell pull work simultaneously, and efficiency improves the one time, and equipment cost only increases 15% double-mould shell room's directional single crystal vacuum induction furnace equipment in four rooms. For realizing the utility model discloses a technical scheme that the purpose adopted is:
a four-chamber directional/single crystal vacuum induction furnace device with a double-module shell chamber is characterized in that,
comprises a furnace body, a casting device, a vacuum system, a smelting power supply, a mould shell heating power supply and a cooling system;
the furnace body is of a communicated vertical four-chamber structure consisting of a feeding chamber, a casting chamber, a first mold shell chamber and a second mold shell chamber;
the casting device consists of an induction melting crucible and a translation turnover mechanism;
the induction melting crucible is arranged on the door wall of the casting chamber;
the vacuum system is connected with the side walls of the casting chamber, the first mold shell chamber and the second mold shell chamber in a seamless mode;
the smelting power supply is connected with the induction smelting crucible;
the mould shell heating power supply is arranged on one side of the furnace body and is respectively connected with the first mould shell induction heater and the second mould shell induction heater;
the cooling system is connected with a casting chamber, a first mold shell chamber, a second mold shell chamber, a first crystallizing disc and a second crystallizing disc of the furnace body; the cooling mode of the crystallizing disc is water cooling or low-melting-point metal cooling.
The scheme is further improved, the first die shell chamber and the second die shell chamber are two independent chambers; the top of the first formwork chamber is communicated with the casting chamber by arranging a first flap valve; the top of the second formwork chamber is communicated with the casting chamber by arranging a second flap valve;
the top of the casting chamber is connected with a feeding chamber through a gate valve.
The proposal is further improved, an induction melting crucible is arranged in the casting chamber;
a first formwork lifting and pulling device and a first crystallization disc are arranged in the first formwork chamber; a second formwork lifting and pulling device and a second crystallization disc are arranged in the second formwork chamber; placing a first mold shell on a first crystallization tray; placing a second mold shell on a second crystallization tray;
and a translational turnover mechanism is horizontally arranged on a door of the casting chamber and is connected and matched with the induction melting crucible.
In a further improvement of the above scheme, the vacuum system comprises a high vacuum system and a low vacuum system;
the high vacuum system is connected with the side wall of the casting chamber in a seamless way;
the low vacuum system is respectively connected with the casting chamber, the first mold shell chamber, the second mold shell chamber and the feeding chamber in a seamless mode through pipelines;
the smelting power supply is connected with the induction smelting crucible through a coaxial water-cooled cable;
the cooling system is respectively connected with the casting chamber, the first formwork chamber and the second formwork chamber through pipelines.
The technical scheme is further improved, the casting chamber of the casting chamber is of a double-furnace-wall water cooling structure, and a first formwork induction heater and a second formwork induction heater are arranged in the casting chamber side by side; the first and second formwork induction heaters are dual zone graphite induction heaters.
The technical scheme is further improved, the first formwork induction heater, the second formwork induction heater and the induction melting crucible are respectively provided with a melting power supply and two formwork heating power supplies, the melting power supply is a single intermediate frequency power supply, and each formwork heating power supply is an intermediate frequency dual power supply; five intermediate frequency power supplies are simultaneously carried out in the casting chamber in the working process, and the mutual interference of 5 sets of power supplies is avoided by adopting a frequency conversion and frequency hopping control mode.
The scheme is further improved, the side edge of the feeding chamber is connected with a temperature measuring device in parallel, the feeding chamber and the temperature measuring device form a turret, the bottom of the turret is provided with a gate valve, and the turret is connected above the casting chamber through a gate valve structure.
The technical scheme is further improved, the induction melting crucible is connected with the translation turnover mechanism, the translation turnover mechanism comprises a tilting servo drive motor reducer, the tilting servo drive motor reducer realizes the tilting of the induction melting crucible at-110 degrees ~ degrees and +110 degrees through a gear fluted disc and realizes the tilting casting of 2 formworks in the left direction and the right direction, the translation drive motor reducer realizes the horizontal movement of the induction melting crucible in the tilting casting in the two directions through a gear rack, a linear guide rail and a rotary encoder, the automatic centering casting can be realized, and the secondary quantitative casting of alloy liquid obtained by primary melting to the formworks in the left direction and the right direction is realized through the accurate control of the casting speed and the tilting angle.
According to the further improvement of the scheme, the first formwork lifting and pulling device and the second formwork lifting and pulling device are matched with a ball screw and a precise linear guide rail to complete lifting and are driven by an alternating current servo motor.
The scheme is further improved, the first flap valve and the second flap valve adopt vacuum water-cooling flap valves, and the driving form is pneumatic.
The utility model has the advantages of it is following:
because 2 sets of mould shell induction heaters and 2 sets of mould shell lifting and pulling mechanisms are adopted, the single crystal/directional high-temperature blade can be pulled while 2 mould shells are adopted. The production efficiency is improved by 1 time.
The utility model discloses 2 directions about the induction melting crucible can be realized to 2 mould shells of tumbling casting. The induction melting crucible can move in the horizontal direction while being tipped for casting in two directions, and automatic centering casting can be realized.
The utility model discloses the crucible is smelted in response can realize that the alloy liquid of once smelting is respectively to controlling the secondary ration casting of 2 orientation moulds shells.
Drawings
Fig. 1 is a front view of the overall structure of the present invention.
Fig. 2 is a left side view of the overall structure of the present invention.
Fig. 3 is a top view of the overall structure of the present invention.
Fig. 4 is a front view of the pan and tilt mechanism.
Wherein: 1. a casting chamber; 2. a mold shell chamber 1; 3. a mold shell chamber 2; 4. a charging chamber; 5. a temperature measuring device; 6. a flap valve 1; 7. a flap valve 2; 8. an induction melting crucible; 9. a formwork induction heater 1; 10. a formwork induction heater 2; 11. a gate valve; 12. a formwork lifting and pulling device 1; 13. a shuttering lifting and pulling device 2; 14. a formwork 1; 15. a mould shell 2; 16. a crystallization tray 1; 17. a crystallization tray 2; 18. a high vacuum system; 20. a low vacuum system; 21. a formwork heating power supply; 22. a smelting power supply; 23. a translation tipping mechanism; 24. a coaxial water-cooled cable; 25. a water-cooled cable; 26. a cooling system; 27. a base plate; 28. a linear guide rail; 29. a rack and pinion; 30. a rotary encoder; 31. a translation drive motor reducer; 32. a translation plate; 33. a lubricating device; 34. tipping the servo drive motor reducer; 35. a water-cooled cable connection mechanism; 36. and a gear fluted disc.
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.
Referring to fig. 1-4, to achieve the above object, the present invention provides the following technical solutions:
a four-chamber directional/single crystal vacuum induction furnace device with a double-module shell chamber is characterized in that,
comprises a furnace body, a casting device, a vacuum system, a smelting power supply 22, a mould shell heating power supply 21 and a cooling system 26;
the furnace body is a communicated vertical four-chamber directional structure consisting of a feeding chamber 4, a casting chamber 1, a first mold shell chamber 2 and a second mold shell chamber 3; the first mold shell chamber 2 and the second mold shell chamber 3 are both of double-furnace wall water cooling structures. Each mould shell chamber is provided with 1 mould shell chamber door; the inner walls of the first mold shell chamber 2 and the second mold shell chamber 3 are made of stainless steel materials, the surfaces of the inner walls are polished, and the surface roughness Ra =1 μm.
The casting device consists of an induction melting crucible 8 and a translation turnover mechanism 23;
the induction melting crucible 8 is arranged on the door wall of the casting chamber 1;
the vacuum system is connected with the side walls of the casting chamber 1, the first mould shell chamber 2 and the second mould shell chamber 3 in a seamless way;
the smelting power supply 22 is connected with the induction smelting crucible 8;
the shuttering heating power supply 21 is arranged at one side of the furnace body, and the shuttering heating power supply 21 is connected with the first shuttering induction heater 9 and the second shuttering induction heater 10 through a water-cooling cable 25.
The cooling system 26 is connected with the casting chamber 1, the first mould shell chamber 2, the second mould shell chamber 3, the first crystallizing disc 16 and the second crystallizing disc 17.
In a further improvement of the scheme, the first mold shell chamber 2 and the second mold shell chamber 3 are two independent chambers; the top of the first die shell chamber 2 is communicated with the casting chamber 1 by arranging a first flap valve 6; the top of the second die shell chamber 2 is communicated with the casting chamber 1 by arranging a second flap valve 7;
the top of the fusion casting chamber 1 is connected with a feeding chamber 4 through a gate valve 11.
The proposal is further improved, an induction melting crucible 8 is arranged in the casting chamber 1;
a first formwork lifting and pulling device 12 and a first crystallization disc 16 are arranged in the first formwork chamber 2; a second formwork lifting and pulling device 13 and a second crystallizing disc 17 are arranged in the second formwork chamber 3; placing a first mold shell 14 on a first crystallization tray 16; placing a second mold shell 15 on a second crystallization tray 17;
a translational turnover mechanism 23 is horizontally arranged on the door of the casting chamber 1, and the translational turnover mechanism 23 is connected with and matched with the induction melting crucible 8.
In a further refinement of the above, the vacuum system includes a high vacuum system 18 and a low vacuum system 20;
the high vacuum system 18 is connected with the side wall of the casting chamber 1 in a seamless way;
the low vacuum system 20 is respectively connected with the casting chamber 1, the first mold shell chamber 2, the second mold shell chamber 3 and the feeding chamber 4 in a seamless mode through pipelines;
the smelting power supply 22 is connected with the induction smelting crucible 8 of the induction smelting crucible through a coaxial water-cooled cable 24;
the cooling system 26 is respectively connected with the casting chamber 1, the first mold shell chamber 2, the second mold shell chamber 3, the first crystallizing disc 16 and the second crystallizing disc 17 through pipelines.
The scheme is further improved, the casting chamber 1 is of a double-furnace-wall water cooling structure, and a casting chamber door is arranged; the inner wall of the casting chamber 1 is made of stainless steel material, the surface of the inner wall is polished, and the surface roughness Ra =1 μm.
A first mould shell induction heater 9 and a second mould shell induction heater 10 are arranged in the casting chamber 1 side by side. The first and second formwork induction heaters 9, 10 are both dual zone graphite induction heaters.
The scheme is further improved, the first formwork induction heater 9, the second formwork induction heater 10 and the induction smelting crucible 8 are respectively provided with a smelting power supply 22 and two formwork heating power supplies 21, the smelting power supply 22 is a single intermediate frequency power supply, and each formwork heating power supply 21 is an intermediate frequency dual power supply; five intermediate frequency power supplies are simultaneously carried out in the casting chamber 1 in the working process, and the mutual interference of 5 sets of power supplies is avoided by adopting a frequency conversion and frequency hopping control mode.
The scheme is further improved, the side edge of the feeding chamber 4 is connected with a temperature measuring device 5 in parallel, the feeding chamber 4 and the temperature measuring device 5 form a turret, the bottom of the turret is provided with a gate valve 11, and the turret is connected above the casting chamber 1 through the structure of the gate valve 11.
The technical scheme is further improved, the induction melting crucible 8 is connected with the translation turnover mechanism 23, the translation turnover mechanism 23 comprises a tipping servo drive motor reducer 34, the tipping servo drive motor reducer 34 realizes overturning of the induction melting crucible at-110 degrees ~ +110 degrees through a gear fluted disc 36 to realize tipping casting of 2 formworks in left and right directions, the translation drive motor reducer 31 realizes that the induction melting crucible 8 can move horizontally while tipping casting in two directions through a gear rack 29, a linear guide rail 28 and a rotary encoder 30 to realize automatic centering casting, and secondary quantitative casting of alloy liquid obtained through primary melting to the formworks in the left and right 2 directions is realized through accurately controlling the casting speed and the tipping angle.
The further improvement of the scheme is that the first formwork lifting and pulling device 12 and the second formwork lifting and pulling device 13 are matched with a ball screw and a precise linear guide rail to complete lifting and are driven by an alternating current servo motor, the ball screw and the precise linear guide rail realize extremely low-speed stable vibration-free drawing and high-speed lifting, and the drawing speed is 0.2 ~ 20mm/min and the quick retraction speed is 4500 mm/min.
The scheme is further improved, the first flap valve 6 and the second flap valve 7 adopt vacuum water-cooling flap valves, and the driving form is pneumatic.
The first and second mould shell induction heaters 9 and 10, the first and second mould shell lifting and pulling devices 12 and 13 can realize that 2 mould shells can simultaneously pull single crystal/directional high-temperature blades. The production efficiency is improved by 1 time.
The translation tilting mechanism comprises a bottom plate 27, a linear guide rail 28, a gear rack 29, a rotary encoder 30, a translation driving motor reducer 31, a translation plate 32, a lubricating device 33 and a tilting servo driving motor reducer 34; water-cooled cable connecting mechanism 35, gear fluted disc 36.
The base plate 27 is provided with a linear guide rail 28 connected with a translation plate 32, the translation plate 32 is provided with a translation driving motor reducer 31, a tilting servo driving motor reducer 34 and a gear fluted disc 36, a rack in the gear rack 29 is connected with the base plate 27, a gear in the gear rack 29 and a rotary encoder 30 are connected with the translation driving motor reducer 31, a water-cooling cable connecting mechanism 35 is connected with a fluted disc in the gear fluted disc 36, and a gear in the gear fluted disc 36 is connected with the tilting servo driving motor reducer 34.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. A four-chamber directional/single crystal vacuum induction furnace device with a double-module shell chamber is characterized in that,
comprises a furnace body, a casting device, a vacuum system, a smelting power supply (22), a mould shell heating power supply (21) and a cooling system (26);
the furnace body is a communicated vertical four-chamber structure consisting of a feeding chamber (4), a casting chamber (1), a first mold shell chamber (2) and a second mold shell chamber (3);
the casting device consists of an induction melting crucible (8) and a translation turnover mechanism (23);
the induction melting crucible (8) is arranged on the door wall of the casting chamber (1);
the vacuum system is in seamless connection with the side walls of the casting chamber (1), the first mold shell chamber (2) and the second mold shell chamber (3);
the smelting power supply (22) is connected with the induction smelting crucible (8);
the mould shell heating power supply (21) is arranged on one side of the furnace body and is respectively connected with the first mould shell induction heater (9) and the second mould shell induction heater (10);
the cooling system (26) is connected with a casting chamber (1), a first mold shell chamber (2), a second mold shell chamber (3), a first crystallization plate (16) and a second crystallization plate (17) of the furnace body; the cooling mode of the crystallizing disc is water cooling or low-melting-point metal cooling.
2. The dual-enclosure-chamber four-chamber directional/single crystal vacuum induction furnace apparatus of claim 1,
the first die shell chamber (2) and the second die shell chamber (3) are two mutually independent chambers; the top of the first die shell chamber (2) is communicated with the casting chamber (1) by arranging a first flap valve (6); the top of the second die shell chamber (2) is communicated with the casting chamber (1) by arranging a second flap valve (7);
the top of the casting chamber (1) is connected with the feeding chamber (4) through a gate valve (11).
3. The dual-enclosure-chamber four-chamber directional/single crystal vacuum induction furnace apparatus of claim 2,
an induction melting crucible (8) is arranged in the casting chamber (1);
a first mould shell lifting and pulling device (12) and a first crystallization disc (16) are arranged in the first mould shell chamber (2); a second mould shell lifting and pulling device (13) and a second crystallizing disc (17) are arranged in the second mould shell chamber (3); placing a first mould shell (14) on a first crystallization tray (16); placing a second mould shell (15) on a second crystallization tray (17);
a translational turnover mechanism (23) is horizontally arranged on a door of the casting chamber (1), and the translational turnover mechanism (23) is connected and matched with the induction melting crucible (8).
4. The dual-enclosure-chamber four-chamber directional/single crystal vacuum induction furnace apparatus of claim 1,
the vacuum system comprises a high vacuum system (18) and a low vacuum system (20);
the high vacuum system (18) is connected with the side wall of the casting chamber (1) in a seamless way;
the low vacuum system (20) is respectively connected with the casting chamber (1), the first mold shell chamber (2), the second mold shell chamber (3) and the feeding chamber (4) in a seamless mode through pipelines;
the smelting power supply (22) is connected with the induction smelting crucible (8) through a coaxial water-cooled cable (24);
and the cooling system (26) is respectively connected with the casting chamber (1), the first mould shell chamber (2) and the second mould shell chamber (3) through pipelines.
5. The dual-enclosure-chamber four-chamber directional/single crystal vacuum induction furnace apparatus of claim 1,
the casting chamber (1) of the casting chamber is of a double-furnace-wall water cooling structure, and a first formwork induction heater (9) and a second formwork induction heater (10) are arranged in the casting chamber (1) side by side; the first and second mould shell induction heaters (9, 10) are dual zone graphite induction heaters.
6. The dual-enclosure-chamber four-chamber directional/single crystal vacuum induction furnace apparatus of claim 5,
the first formwork induction heater (9), the second formwork induction heater (10) and the induction melting crucible (8) are respectively provided with a melting power supply (22) and two formwork heating power supplies (21), the melting power supply (22) is a single intermediate frequency power supply, and each formwork heating power supply (21) is an intermediate frequency dual power supply; five intermediate frequency power supplies are simultaneously carried out in the casting chamber (1) in the working process, and the mutual interference of 5 sets of power supplies is avoided by adopting a frequency conversion and frequency hopping control mode.
7. The dual-enclosure-chamber four-chamber directional/single crystal vacuum induction furnace apparatus of claim 1,
the side edge of the feeding chamber (4) is connected with a temperature measuring device (5) in parallel, the feeding chamber (4) and the temperature measuring device (5) form a turret, the bottom of the turret is provided with a gate valve (11), and the turret is connected above the casting chamber (1) through a gate valve (11) structure.
8. The dual-enclosure-chamber four-chamber directional/single crystal vacuum induction furnace apparatus of claim 1,
the induction melting crucible (8) is connected with the translation turnover mechanism (23), the translation turnover mechanism (23) comprises a tilting servo drive motor reducer (34), the tilting servo drive motor reducer (34) realizes the tilting of the induction melting crucible (8) at-110 degrees ~ degrees and 110 degrees through a gear fluted disc (36) to realize the tilting casting of 2 formworks in the left direction and the right direction, the translation drive motor reducer (31) realizes the horizontal movement of the induction melting crucible (8) in the two directions while the induction melting crucible is tilted casting through a gear rack (29), a linear guide rail (28) and a rotary encoder (30) to realize the automatic centering casting, and realizes the secondary quantitative casting of the alloy liquid which is melted once to the formworks in the left direction and the right direction respectively by accurately controlling the casting speed and the tilting angle.
9. The dual-enclosure-chamber four-chamber directional/single crystal vacuum induction furnace apparatus of claim 1,
the first formwork lifting and pulling device (12) and the second formwork lifting and pulling device (13) are matched with a precision linear guide rail through a ball screw to complete lifting and are driven by an alternating current servo motor.
10. The dual-enclosure-chamber four-chamber directional/single crystal vacuum induction furnace apparatus of claim 2,
the first flap valve (6) and the second flap valve (7) adopt vacuum water-cooling flap valves, and the driving form is pneumatic.
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| CN201920308950.9U CN209867337U (en) | 2019-03-12 | 2019-03-12 | Four-chamber directional/single crystal vacuum induction furnace equipment with double-module shell chamber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109759570A (en) * | 2019-03-12 | 2019-05-17 | 永大科技集团有限公司 | Four Room orientations/monocrystalline vacuum induction furnace apparatus of bimodulus housing chamber |
| CN111570779A (en) * | 2020-03-31 | 2020-08-25 | 宁波可可磁业股份有限公司 | Vacuum smelting furnace for neodymium iron boron production |
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2019
- 2019-03-12 CN CN201920308950.9U patent/CN209867337U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109759570A (en) * | 2019-03-12 | 2019-05-17 | 永大科技集团有限公司 | Four Room orientations/monocrystalline vacuum induction furnace apparatus of bimodulus housing chamber |
| CN109759570B (en) * | 2019-03-12 | 2024-05-03 | 江苏永瀚特种合金技术股份有限公司 | Four-chamber directional/single crystal vacuum induction furnace equipment with double mould chambers |
| CN111570779A (en) * | 2020-03-31 | 2020-08-25 | 宁波可可磁业股份有限公司 | Vacuum smelting furnace for neodymium iron boron production |
| CN111570779B (en) * | 2020-03-31 | 2021-08-31 | 宁波可可磁业股份有限公司 | Vacuum smelting furnace for neodymium iron boron production |
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Effective date of registration: 20211228 Address after: 214161 No. 11, Liulu Road, Hudai Town, Binhu District, Wuxi City, Jiangsu Province Patentee after: Jiangsu Yonghan special alloy technology Co.,Ltd. Address before: 214124 No. 2, Liye Road, economic development zone, Binhu District, Wuxi City, Jiangsu Province Patentee before: YONGDA TECHNOLOGY GROUP Co.,Ltd. |
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