CN114535514A - Cooling method of wind power casting based on air-cooled sand core system - Google Patents
Cooling method of wind power casting based on air-cooled sand core system Download PDFInfo
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- CN114535514A CN114535514A CN202210029252.1A CN202210029252A CN114535514A CN 114535514 A CN114535514 A CN 114535514A CN 202210029252 A CN202210029252 A CN 202210029252A CN 114535514 A CN114535514 A CN 114535514A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
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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
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
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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
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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Abstract
A cooling method of a wind power casting based on an air-cooled sand core system comprises the following steps: making a die cavity in the sand box by using molding sand and a model; installing a core seat in the cavity and connecting the air-cooled sand core to the core seat; the air inlet main pipe and the air outlet main pipe of the air cooling channel of the air cooling type sand core are respectively connected with an external cold air source and a waste heat recovery system; after molten iron is injected into the cavity, cooling to prepare a casting; before molten iron is injected, blowing cold air into an air inlet main pipe, wherein the temperature of the cold air is 4-25 ℃; for castings with wall thickness greater than 300 mm: keeping the air pressure intensity of the cold air to be 1.8-2.3 MPa; stopping ventilation after 12 hours, and naturally cooling the casting; for castings with wall thicknesses between 100mm and 300 mm: keeping the air pressure intensity of the cold air at 1.8-2.0 MPa; after 12 hours, the aeration is stopped, and the casting is naturally cooled. The method adjusts the temperature and the air pressure of the cold air, and improves the cooling efficiency and the casting quality.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a cooling method of a wind power casting based on an air-cooled sand core system.
Background
In the prior art, when a casting with a hole in the middle is cast, the hole part is mostly formed by a core. The mold core is placed in the mold cavity before casting, and after molten iron is poured and condensed, the mold core is taken out/removed during sand discharging, so that the cavity corresponding to the opening can be formed in the casting. The molten iron cooling has a great influence on the quality of the casting and the like. The most ideal state is that all parts of molten iron in the cavity are synchronously cooled. In practice, this is not possible, and it is common practice to optimize the cooling effect of the various parts as much as possible by the design of the mould cavity. And because the volume of the casting of the wind power product is large, the position of the core is surrounded by molten iron under most conditions, and the cooling speed of the position is far lower than that of other positions. Particularly, for casting cavities with irregular shapes, no better method is available for cooling at present, and in order to ensure the casting quality, the casting quality can be achieved only through high requirements on a casting process, and the difficulty of process control is higher.
Chinese patent ZL201921674399.6 proposes an air-cooled sand core system for casting a wind power casting, which can be utilized in the cooling process of the wind power casting. During the use process, the factors such as the temperature and the air pressure of cold air in the air cooling process have great influence on the quality of the casting, and even if the process parameters are not used properly, the negative influence is brought to the safe production.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a cooling method of a wind power casting based on an air-cooled sand core system, which comprises the following steps: 1) molding sand mixed with a molding sand binder and a model are used for manufacturing a cavity in the sand box; 2) installing a core seat in the cavity and connecting the air-cooled sand core to the core seat; the air inlet main pipe and the air outlet main pipe of the air cooling channel of the air cooling type sand core are respectively connected with an external cold air source and a waste heat recovery system; 3) after molten iron is injected into the cavity, cooling to prepare a casting;
in the step 3), before molten iron is injected, blowing cold air into the air inlet main pipe, wherein the temperature of the cold air is 4-25 ℃, and the air pressure intensity in the air inlet main pipe is kept at 1.8-2.3 MPa;
for castings with wall thickness greater than 300 mm:
keeping the air pressure intensity of the cold air to be 2.0-2.3 MPa within 1-4 hours;
keeping the air pressure intensity of the cold air to be 1.9-2.1 MPa within 5-8 hours;
keeping the air pressure intensity of the cold air to be 1.8-2.0 MPa within 9-12 hours;
stopping ventilation after 12 hours, and naturally cooling the casting;
for castings with wall thicknesses between 100mm and 300 mm:
keeping the air pressure intensity of the cold air to be 1.8-2.1 MPa within 1-4 hours;
keeping the air pressure intensity of the cold air to be 1.8-2.0 MPa within 5-8 hours;
keeping the air pressure intensity of the cold air to be 1.8-1.9 MPa within 9-12 hours;
after 12 hours, the aeration is stopped, and the casting is naturally cooled.
In the cooling process, the molten iron cooling speed is high at the beginning, the air pressure of the cold air is higher, and the heat can be quickly removed. In the cooling process, the cooling process is gradually slowed down, so that the phenomenon that local grains are thick and large to influence the overall mechanical property can be avoided.
According to different seasons and ambient temperatures, the temperature and the air pressure of the cold air are adjusted, the cooling efficiency and the casting quality are improved, meanwhile, the situation that the cooling temperature is pursued once is avoided, and the potential safety hazard caused by sudden expansion of the cold air is avoided.
Figure illustrates the drawings
FIG. 1 is a graph of the temperature drop of natural cooling versus the present method cooling.
Detailed Description
The present disclosure is further described below with reference to specific embodiments. The air-cooled sand core system used in the present example for casting wind power castings is the system in ZL 201921674399.6.
A cooling method of a wind power casting based on an air-cooled sand core system comprises the following steps: 1) molding sand mixed with a molding sand binder and a model are used for manufacturing a cavity in the sand box; 2) installing a core seat in the cavity and connecting the air-cooled sand core to the core seat; the air inlet main pipe and the air outlet main pipe of the air cooling channel of the air cooling type sand core are respectively connected with an external cold air source and a waste heat recovery system; 3) after molten iron is injected into the cavity, cooling to prepare a casting; in the step 3), before molten iron is injected, blowing cold air into the air inlet main pipe, wherein the temperature of the cold air is 4-25 ℃, and the air pressure intensity in the air inlet main pipe is kept at 1.8-2.3 MPa;
in summer, the ambient temperature is high, in the step 3), the temperature of cold air is 25 ℃, and the air pressure intensity in the air inlet main pipe is kept at 2.0-2.3 MPa;
for castings with wall thickness greater than 300 mm:
keeping the air pressure intensity of the cold air at 2.3MPa within 1-4 hours;
keeping the air pressure intensity of the cold air at 2.1MPa within 5-8 hours;
keeping the air pressure intensity of the cold air at 2.0MPa within 9-12 hours;
stopping ventilation after 12 hours, and naturally cooling the casting;
for castings with wall thicknesses between 100mm and 300 mm:
keeping the air pressure intensity of the cold air at 2.1MPa within 1-4 hours;
keeping the air pressure intensity of the cold air at 2.0MPa within 5-8 hours;
keeping the air pressure intensity of the cold air at 2.0MPa within 9-12 hours;
after 12 hours, the aeration is stopped, and the casting is naturally cooled.
In winter, the ambient temperature is low, in the step 3), the temperature of cold air is 4 ℃, and the air pressure intensity in the air inlet main pipe is kept at 1.8-2.0 MPa;
for castings with wall thickness greater than 300 mm:
keeping the air pressure intensity of the cold air at 2.0MPa within 1-4 hours;
keeping the air pressure intensity of the cold air at 1.9MPa within 5-8 hours;
keeping the air pressure intensity of the cold air at 1.8MPa within 9-12 hours;
stopping ventilation after 12 hours, and naturally cooling the casting;
for castings with wall thicknesses between 100mm and 300 mm:
keeping the air pressure intensity of the cold air at 1.8MPa within 1-4 hours;
keeping the air pressure intensity of the cold air at 1.8MPa within 5-8 hours;
keeping the air pressure intensity of the cold air at 1.8MPa within 9-12 hours;
after 12 hours, the aeration is stopped, and the casting is naturally cooled.
In other seasons, in the step 3), the temperature of cold air is 10 ℃, and the air pressure intensity in the air inlet main pipe is kept at 1.8-2.2 MPa;
keeping the temperature of the cold air at 10 ℃;
in the process of injecting molten iron, the temperature of cold air is kept at 10 ℃;
after the molten iron is poured, blowing cold air into the air inlet main pipe:
for castings with wall thickness greater than 300 mm:
keeping the air pressure intensity of the cold air at 2.2MPa within 1-4 hours;
keeping the air pressure intensity of the cold air at 2.0MPa within 5-8 hours;
keeping the air pressure intensity of the cold air at 1.8MPa within 9-12 hours;
stopping ventilation after 12 hours, and naturally cooling the casting;
for castings with wall thicknesses between 100mm and 300 mm:
keeping the air pressure intensity of the cold air at 2MPa within 1-4 hours;
keeping the air pressure intensity of the cold air at 1.8MPa within 5-8 hours;
keeping the air pressure intensity of the cold air at 1.8MPa within 9-12 hours;
stopping ventilation after 12 hours, and naturally cooling the casting;
referring to the cooling curve of fig. 1: in the initial stage, the temperature drop speed of natural cooling and the cooling of the method is close to each other, the main reason is that the sand mold is slow in heat transfer, and the temperature drop in the stage mainly depends on the heat conduction between the molten iron and the sand mold.
Along with the continuation of the cooling process, it can be obviously seen that the cooling speed of the method is higher.
Claims (5)
1. A cooling method of a wind power casting based on an air-cooled sand core system comprises the following steps: 1) molding sand mixed with a molding sand binder and a model are used for manufacturing a cavity in the sand box; 2) installing a core seat in the cavity and connecting the air-cooled sand core to the core seat; the air inlet main pipe and the air outlet main pipe of the air cooling channel of the air cooling type sand core are respectively connected with an external cold air source and a waste heat recovery system; 3) after molten iron is injected into the cavity, cooling to prepare a casting;
the method is characterized in that in the step 3), before molten iron is injected, cold air is blown into the air inlet main pipe, the temperature of the cold air is 4-25 ℃, and the air pressure intensity in the air inlet main pipe is kept at 1.8-2.3 MPa;
for castings with wall thickness greater than 300 mm:
keeping the air pressure intensity of cold air in the air inlet main pipe to be 2.0-2.3 MPa within 1-4 hours;
keeping the air pressure intensity of cold air in the air inlet main pipe to be 1.9-2.1 MPa within 5-8 hours;
keeping the air pressure intensity of cold air in the air inlet main pipe to be 1.8-2.0 MPa within 9-12 hours;
for castings with wall thicknesses between 100mm and 300 mm:
keeping the air pressure intensity of cold air in the air inlet main pipe to be 1.8-2.1 MPa within 1-4 hours;
keeping the air pressure intensity of cold air in the air inlet main pipe to be 1.8-2.0 MPa within 5-8 hours;
and keeping the air pressure intensity of cold air in the air inlet main pipe to be 1.8-1.9 MPa within 9-12 hours.
2. The method for cooling the wind power casting based on the air-cooled sand core system according to claim 1, wherein the time for keeping the air pressure intensity in the air inlet main pipe at 1.8-2.3 MPa is 12 hours, and after 12 hours, the ventilation is stopped, and the casting is naturally cooled.
3. The cooling method for the wind power casting based on the air-cooled sand core system according to the claim 1 or 2, wherein in the step 3), the temperature of the cold air is 25 ℃, and the air pressure intensity in an air inlet main pipe is kept to be 2.0-2.3 MPa;
for castings with wall thickness greater than 300 mm:
keeping the air pressure intensity of cold air in an air inlet main pipe to be 2.3MPa within 1-4 hours;
keeping the air pressure intensity of cold air in the air inlet main pipe to be 2.1MPa within 5-8 hours;
keeping the air pressure intensity of cold air in the air inlet main pipe to be 2.0MPa within 9-12 hours;
stopping ventilation after 12 hours, and naturally cooling the casting;
for castings with wall thicknesses between 100mm and 300 mm:
keeping the air pressure intensity of cold air in the air inlet main pipe to be 2.1MPa within 1-4 hours;
keeping the air pressure intensity of cold air in the air inlet main pipe to be 2.0MPa within 5-8 hours;
keeping the air pressure intensity of cold air in the air inlet main pipe to be 2.0MPa within 9-12 hours;
after 12 hours, the aeration is stopped, and the casting is naturally cooled.
4. The cooling method for the wind power casting based on the air-cooled sand core system according to the claim 1 or 2, characterized in that in the step 3), the temperature of the cold air is 10 ℃, and the air pressure intensity in the air inlet main pipe is kept to be 1.8-2.2 MPa;
keeping the temperature of the cold air at 10 ℃;
in the process of injecting molten iron, the temperature of cold air is kept at 10 ℃;
after the molten iron is poured, blowing cold air into the air inlet main pipe:
for castings with wall thickness greater than 300 mm:
keeping the air pressure intensity of cold air in an air inlet main pipe to be 2.2MPa within 1-4 hours;
keeping the air pressure intensity of cold air in the air inlet main pipe to be 2.0MPa within 5-8 hours;
keeping the air pressure intensity of cold air in the air inlet main pipe to be 1.8MPa within 9-12 hours;
stopping ventilation after 12 hours, and naturally cooling the casting;
for castings with wall thicknesses between 100mm and 300 mm:
keeping the air pressure intensity of cold air in an air inlet main pipe to be 2MPa within 1-4 hours;
keeping the air pressure intensity of cold air in the air inlet main pipe to be 1.8MPa within 5-8 hours;
keeping the air pressure intensity of cold air in the air inlet main pipe to be 1.8MPa within 9-12 hours;
after 12 hours, the aeration is stopped, and the casting is naturally cooled.
5. The cooling method for the wind power casting based on the air-cooled sand core system according to the claim 1 or 2, wherein in the step 3), the temperature of the cold air is 4 ℃, and the air pressure intensity in an air inlet main pipe is kept to be 1.8-2.0 MPa;
for castings with wall thickness greater than 300 mm:
keeping the air pressure intensity of cold air in the air inlet main pipe to be 2.0MPa within 1-4 hours;
keeping the air pressure intensity of cold air in the air inlet main pipe to be 1.9MPa within 5-8 hours;
keeping the air pressure intensity of cold air in the air inlet main pipe to be 1.8MPa within 9-12 hours;
stopping ventilation after 12 hours, and naturally cooling the casting;
for castings with wall thicknesses between 100mm and 300 mm:
keeping the air pressure intensity of cold air in the air inlet main pipe to be 1.8MPa within 1-4 hours;
keeping the air pressure intensity of cold air in the air inlet main pipe to be 1.8MPa within 5-8 hours;
keeping the air pressure intensity of cold air in the air inlet main pipe to be 1.8MPa within 9-12 hours;
after 12 hours, the aeration is stopped, and the casting is naturally cooled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210029252.1A CN114535514B (en) | 2022-01-12 | 2022-01-12 | Cooling method of wind power casting based on air-cooled sand core system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210029252.1A CN114535514B (en) | 2022-01-12 | 2022-01-12 | Cooling method of wind power casting based on air-cooled sand core system |
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| CN114535514B CN114535514B (en) | 2023-09-08 |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD149477A1 (en) * | 1980-03-25 | 1981-07-15 | Guenter Pollatz | COOLING SYSTEM FOR CAST OIL, ESPECIALLY OF SANDING MATERIAL |
| JPH09225621A (en) * | 1996-02-21 | 1997-09-02 | Kimura Chuzosho:Kk | Method for cooling casting |
| US20030102100A1 (en) * | 2000-03-27 | 2003-06-05 | Heiko Voigt | Method for the uphill casting of cast pieces in sand dies with controlled solidification |
| CN101293273A (en) * | 2008-05-23 | 2008-10-29 | 中国科学院金属研究所 | Process for manufacturing low-aliquation large-scale hollow steel ingot |
| CN103111606A (en) * | 2012-07-27 | 2013-05-22 | 宁夏共享集团有限责任公司 | Forced cooling method for wind power cast |
| CN104959580A (en) * | 2015-07-23 | 2015-10-07 | 乐山沙湾天华机械制造有限责任公司 | Cooling device of casting mold and application thereof |
| CN207709795U (en) * | 2017-12-28 | 2018-08-10 | 安徽应流集团霍山铸造有限公司 | A kind of casting device for accelerating core cooling |
| CN109317645A (en) * | 2018-10-20 | 2019-02-12 | 共享装备股份有限公司 | A kind of quenching method |
| CN110508754A (en) * | 2019-10-09 | 2019-11-29 | 上海机床铸造一厂（苏州）有限公司 | The ventilation type sand core system of wind power casting casting |
| CN110508755A (en) * | 2019-10-09 | 2019-11-29 | 上海机床铸造一厂（苏州）有限公司 | Gas-vapor mix cooled type core system for large-scale wind electricity cast casting |
| CN111230047A (en) * | 2018-11-28 | 2020-06-05 | 株式会社日立制作所 | Combined mold core |
-
2022
- 2022-01-12 CN CN202210029252.1A patent/CN114535514B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD149477A1 (en) * | 1980-03-25 | 1981-07-15 | Guenter Pollatz | COOLING SYSTEM FOR CAST OIL, ESPECIALLY OF SANDING MATERIAL |
| JPH09225621A (en) * | 1996-02-21 | 1997-09-02 | Kimura Chuzosho:Kk | Method for cooling casting |
| US20030102100A1 (en) * | 2000-03-27 | 2003-06-05 | Heiko Voigt | Method for the uphill casting of cast pieces in sand dies with controlled solidification |
| CN101293273A (en) * | 2008-05-23 | 2008-10-29 | 中国科学院金属研究所 | Process for manufacturing low-aliquation large-scale hollow steel ingot |
| CN103111606A (en) * | 2012-07-27 | 2013-05-22 | 宁夏共享集团有限责任公司 | Forced cooling method for wind power cast |
| CN104959580A (en) * | 2015-07-23 | 2015-10-07 | 乐山沙湾天华机械制造有限责任公司 | Cooling device of casting mold and application thereof |
| CN207709795U (en) * | 2017-12-28 | 2018-08-10 | 安徽应流集团霍山铸造有限公司 | A kind of casting device for accelerating core cooling |
| CN109317645A (en) * | 2018-10-20 | 2019-02-12 | 共享装备股份有限公司 | A kind of quenching method |
| CN111230047A (en) * | 2018-11-28 | 2020-06-05 | 株式会社日立制作所 | Combined mold core |
| CN110508754A (en) * | 2019-10-09 | 2019-11-29 | 上海机床铸造一厂（苏州）有限公司 | The ventilation type sand core system of wind power casting casting |
| CN110508755A (en) * | 2019-10-09 | 2019-11-29 | 上海机床铸造一厂（苏州）有限公司 | Gas-vapor mix cooled type core system for large-scale wind electricity cast casting |
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