CN114535514B - 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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- CN114535514B CN114535514B CN202210029252.1A CN202210029252A CN114535514B CN 114535514 B CN114535514 B CN 114535514B CN 202210029252 A CN202210029252 A CN 202210029252A CN 114535514 B CN114535514 B CN 114535514B
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
A cooling method of a wind power casting based on an air-cooled sand core system comprises the following steps: molding sand and a model in a sand box to form a cavity; installing a core seat in the cavity, and connecting an air-cooled sand core to the core seat; an air inlet main pipe and an air outlet main pipe of an air cooling channel of the air cooling sand core are respectively connected with an external cold air source and a waste heat recovery system; pouring molten iron into the cavity, and cooling to prepare a casting; before molten iron is injected, cold air is blown into the air inlet header pipe, wherein the temperature of the cold air is 4-25 ℃; for castings with wall thicknesses greater than 300 mm: maintaining 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: maintaining the air pressure intensity of the cold air to be 1.8-2.0 MPa; after 12 hours, stopping ventilation and naturally cooling the casting. 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, the cast with the middle hole is cast by a core in most of the hole parts. The core is placed in the cavity before casting, after molten iron is poured in and condensed, the core is taken out/removed during sand discharge, and a cavity corresponding to the opening can be formed in the casting. The cooling of molten iron has a great influence on the quality of castings and the like. In the most ideal state, all parts of molten iron in the die cavity are synchronously cooled. In practice this is not possible, typically by optimizing the cooling effect of the individual parts as much as possible by the cavity design. And because the volume of the castings of the wind power product is large, in most cases, the position of the core is surrounded by molten iron, and the cooling speed of the position is far lower than that of other positions. Particularly, for irregularly-shaped casting cavities, no better method is provided for cooling at present, and in order to ensure the casting quality, the cooling can only be achieved through high requirements on a casting process, and the process control difficulty is high.
The Chinese patent ZL201921674399.6 proposes an air-cooled sand core system for casting wind power castings, which can be utilized in the cooling process of the wind power castings. In the use process, the factors such as cold air temperature, air pressure and the like in the air cooling process have great influence on the quality of castings, and even have negative influence on safe production if the process parameters are improperly used.
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 in a sand box to form a cavity; 2) Installing a core seat in the cavity, and connecting an air-cooled sand core to the core seat; an air inlet main pipe and an air outlet main pipe of an air cooling channel of the air-cooled sand core are respectively connected with an external cold air source and a waste heat recovery system; 3) Pouring molten iron into the cavity, and cooling to prepare a casting;
in the step 3), before molten iron is injected, cold air is blown 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 between 1.8 and 2.3MPa;
for castings with wall thicknesses greater than 300 mm:
the air pressure intensity of the cold air is kept to be 2.0-2.3 MPa within 1-4 hours;
the air pressure intensity of the cold air is kept to be 1.9-2.1 MPa within 5-8 hours;
the air pressure intensity of the cold air is kept 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:
the air pressure intensity of the cold air is kept to be 1.8-2.1 MPa within 1-4 hours;
the air pressure intensity of the cold air is kept to be 1.8-2.0 MPa within 5-8 hours;
the air pressure intensity of the cold air is kept to be 1.8-1.9 MPa within 9-12 hours;
after 12 hours, stopping ventilation and naturally cooling the casting.
In the cooling process, the cooling speed of molten iron is high at the beginning, the air pressure of cold air is high, and heat can be removed quickly. In the cooling process, the cooling process is gradually slowed down, so that the influence on the whole mechanical property due to coarse local crystal grains can be avoided.
According to different seasons and environmental temperatures, the temperature and the air pressure of the cold air are adjusted, the cooling efficiency and the casting quality are improved, and meanwhile, the situation that the cooling temperature is pursued once is avoided, and potential safety hazards caused by sudden expansion of the cold air are avoided.
Drawings
FIG. 1 is a graph of the temperature drop of natural cooling versus cooling by the present method.
Detailed Description
The present invention is further described below in conjunction with the following specific examples. The air-cooled sand core system for casting the wind power casting in the example is a 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 in a sand box to form a cavity; 2) Installing a core seat in the cavity, and connecting an air-cooled sand core to the core seat; an air inlet main pipe and an air outlet main pipe of an air cooling channel of the air-cooled sand core are respectively connected with an external cold air source and a waste heat recovery system; 3) Pouring molten iron into the cavity, and cooling to prepare a casting; in the step 3), before molten iron is injected, cold air is blown into an 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 between 1.8 and 2.3MPa;
in summer, the ambient temperature is higher, in the step 3), the cold air is at 25 ℃, and the air pressure intensity in an air inlet main pipe is kept at 2.0-2.3 MPa;
for castings with wall thicknesses greater than 300 mm:
the air pressure intensity of the cold air is kept to be 2.3MPa within 1-4 hours;
the air pressure intensity of the cold air is kept to be 2.1MPa within 5-8 hours;
maintaining the air pressure intensity of the cold air 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:
the air pressure intensity of the cold air is kept to be 2.1MPa within 1-4 hours;
the air pressure intensity of the cold air is kept to be 2.0MPa within 5-8 hours;
maintaining the air pressure intensity of the cold air to be 2.0MPa within 9-12 hours;
after 12 hours, stopping ventilation and naturally cooling the casting.
In winter, the ambient temperature is lower, in the step 3), the cold air is at 4 ℃, and the air pressure intensity in an air inlet main pipe is kept at 1.8-2.0 MPa;
for castings with wall thicknesses greater than 300 mm:
the air pressure intensity of the cold air is kept to be 2.0MPa within 1-4 hours;
the air pressure intensity of the cold air is kept to be 1.9MPa within 5-8 hours;
the air pressure intensity of the cold air is kept 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:
the air pressure intensity of the cold air is kept to be 1.8MPa within 1-4 hours;
the air pressure intensity of the cold air is kept to be 1.8MPa within 5-8 hours;
the air pressure intensity of the cold air is kept to be 1.8MPa within 9-12 hours;
after 12 hours, stopping ventilation and naturally cooling the casting.
In other seasons, in the step 3), the temperature of cold air is 10 ℃, and the air pressure intensity in an air inlet main pipe is kept between 1.8 and 2.2MPa;
the temperature of the cold air is kept at 10 ℃;
in the process of pouring molten iron, the temperature of cold air is kept at 10 ℃;
after the molten iron pouring is completed, cold air is blown into the air inlet main pipe:
for castings with wall thicknesses greater than 300 mm:
the air pressure intensity of the cold air is kept to be 2.2MPa within 1-4 hours;
the air pressure intensity of the cold air is kept to be 2.0MPa within 5-8 hours;
the air pressure intensity of the cold air is kept 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:
the air pressure intensity of the cold air is kept to be 2MPa within 1-4 hours;
the air pressure intensity of the cold air is kept to be 1.8MPa within 5-8 hours;
the air pressure intensity of the cold air is kept to be 1.8MPa within 9-12 hours;
stopping ventilation after 12 hours, and naturally cooling the casting;
referring to the cooling profile of fig. 1: in the initial stage, the natural cooling is close to the cooling temperature drop speed of the method, and the main reason is that the heat transfer of the sand mould is slower, and the cooling in the stage mainly depends on the heat transfer between molten iron and the sand mould.
As the cooling process continues, the method has higher cooling speed.
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 in a sand box to form a cavity; 2) Installing a core seat in the cavity, and connecting an air-cooled sand core to the core seat; an air inlet main pipe and an air outlet main pipe of an air cooling channel of the air-cooled sand core are respectively connected with an external cold air source and a waste heat recovery system; 3) Pouring molten iron into the cavity, and cooling to prepare a casting;
the method is characterized in that in the step 3), cold air is blown into an air inlet main pipe before molten iron is injected, the cold air is at 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 thicknesses greater than 300 mm:
within 1-4 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 2.0-2.3 MPa;
within 5-8 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 1.9-2.1 MPa;
within 9-12 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 1.8-2.0 MPa;
for castings with wall thicknesses between 100mm and 300 mm:
within 1-4 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 1.8-2.1 MPa;
within 5-8 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 1.8-2.0 MPa;
and within 9-12 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 1.8-1.9 MPa.
2. The cooling method of the wind power casting based on the air-cooled sand core system according to claim 1, wherein the time for maintaining the air pressure intensity in the air inlet main pipe at 1.8-2.3 MPa is 12 hours, and after the air inlet main pipe is full of 12 hours, ventilation is stopped, and the casting is naturally cooled.
3. The method for cooling a wind power casting based on an air-cooled sand core system according to claim 1 or 2, wherein in the step 3), the cool air is at 10 ℃, and the air pressure intensity in an air inlet main pipe is kept between 1.8 and 2.2MPa;
the temperature of the cold air is kept at 10 ℃;
in the process of pouring molten iron, the temperature of cold air is kept at 10 ℃;
after the molten iron pouring is completed, cold air is blown into the air inlet main pipe:
for castings with wall thicknesses greater than 300 mm:
within 1-4 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 2.2MPa;
within 5-8 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 2.0MPa;
the air pressure intensity of cold air in the air inlet main pipe is kept 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:
within 1-4 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 2MPa;
within 5-8 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 1.8MPa;
the air pressure intensity of cold air in the air inlet main pipe is kept to be 1.8MPa within 9-12 hours;
after 12 hours, stopping ventilation and naturally cooling the casting.
4. The method for cooling a wind power casting based on an air-cooled sand core system according to claim 1 or 2, wherein in the step 3), the cool air is at 4 ℃, and the air pressure intensity in the air inlet manifold is kept between 1.8 and 2.0MPa;
for castings with wall thicknesses greater than 300 mm:
within 1-4 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 2.0MPa;
within 5-8 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 1.9MPa;
the air pressure intensity of cold air in the air inlet main pipe is kept 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:
within 1-4 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 1.8MPa;
within 5-8 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 1.8MPa;
the air pressure intensity of cold air in the air inlet main pipe is kept to be 1.8MPa within 9-12 hours;
after 12 hours, stopping ventilation and naturally cooling the casting.
5. 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 in a sand box to form a cavity; 2) Installing a core seat in the cavity, and connecting an air-cooled sand core to the core seat; an air inlet main pipe and an air outlet main pipe of an air cooling channel of the air-cooled sand core are respectively connected with an external cold air source and a waste heat recovery system; 3) Pouring molten iron into the cavity, and 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 an air inlet main pipe, the cold air is at 25 ℃, and the air pressure intensity in the air inlet main pipe is kept between 2.0 and 2.3MPa;
for castings with wall thicknesses greater than 300 mm:
within 1-4 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 2.3MPa;
within 5-8 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 2.1MPa;
the air pressure intensity of cold air in the air inlet main pipe is kept 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:
within 1-4 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 2.1MPa;
within 5-8 hours, the air pressure intensity of cold air in the air inlet main pipe is kept to be 2.0MPa;
the air pressure intensity of cold air in the air inlet main pipe is kept to be 2.0MPa within 9-12 hours;
after 12 hours, stopping ventilation and naturally cooling the casting.
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 |
|---|---|---|---|
| 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 true CN114535514B (en) | 2023-09-08 |
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Citations (10)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10014591C1 (en) * | 2000-03-27 | 2001-08-02 | Actech Gmbh Adv Casting Tech | Process for increasing pouring in sand molds with directional solidification of castings |
-
2022
- 2022-01-12 CN CN202210029252.1A patent/CN114535514B/en active Active
Patent Citations (10)
| 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 |
| 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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| CN114535514A (en) | 2022-05-27 |
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