CN114713800A - Solid metal feeding method for thick and large casting - Google Patents
Solid metal feeding method for thick and large casting Download PDFInfo
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- CN114713800A CN114713800A CN202210276070.4A CN202210276070A CN114713800A CN 114713800 A CN114713800 A CN 114713800A CN 202210276070 A CN202210276070 A CN 202210276070A CN 114713800 A CN114713800 A CN 114713800A
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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
- B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
- B22D23/06—Melting-down metal, e.g. metal particles, in the mould
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention belongs to the technical field of metal casting, and discloses a solid metal feeding method for a thick and large casting, which comprises the following steps: the method comprises the following steps: determining the position and the size of a casting hot spot according to the structural size of the casting; step two: calculating the size of the metal block for feeding solid according to the size of the thermal node; step three: processing a metal block with the same material as the casting; step four: manufacturing a casting mold; step five: fixing the processed metal block at the center of the hot spot in the casting mould by adopting a metal wire, a support frame and the like; step six: baking the fixed metal block before casting the casting mould and closing the box; step seven: the casting is performed with mould closing, the metal block is completely or surface layer melted in the casting mould and is fused with the casting into a whole along with the solidification of the casting to form a part of the casting; step eight: after the casting is completely solidified, boxing and cleaning are carried out, and after a casting head is cut, the casting is obtained; step nine: and carrying out heat treatment on the casting.
Description
Technical Field
The invention belongs to the technical field of hot working, and relates to a solid metal feeding method for a thick and large casting.
Background
At present, a casting feeding method usually adopts riser feeding, for a thick and large casting with the thickness of more than 250mm, particularly for metal with large volume shrinkage rate during solidification, because the alloy has poor fluidity and poor feeding effect, a relatively large riser is often needed to improve feeding capacity, the consumption of produced metal is increased, the metal smelting amount and the working hours and expenses for cutting and machining a casting head are increased, and the production cost is increased.
Disclosure of Invention
The invention overcomes the problems of large metal consumption and more working hours for smelting, cutting and processing casting heads caused by only adopting riser feeding, and provides a solid metal feeding method for thick and large castings.
A solid metal feeding method for a thick and large casting comprises the following steps:
the method comprises the following steps: calculating the shape and size of the thermal node according to the shape and size of the casting;
step two: manufacturing a metal block with the same material as the casting; the shape of the metal block is similar to that of the thermal node;
step three: fixing the metal blocks in the dried sand mold;
step four: preheating the fixed metal block;
step five: after preheating is finished, molding the sand mold into a final mold;
step six: pouring molten metal into a mold;
step seven: and forming a casting after the molten metal is cooled.
Further, in the first step, the size and the shape of the casting thermal node are measured and calculated through procasting software.
Further, in the second step, the size of the metal block is 28% -30% of the size of the hot spot.
Further, in the third step, the metal block is fixed by a bracket or a metal wire hoisting mode.
Further, the bracket or the metal wire is made of the same material as the casting.
Further, in the fourth step, the preheating temperature of the metal block is 250-300 ℃; preheating time length: 5min to 10 min.
Further, in the sixth step, the time interval after the pouring and the preheating is finished does not exceed 20 min.
Further, in the seventh step, the cooling method is as follows: naturally cooling at room temperature for not less than 12 h.
The invention has the following effects:
the invention provides a novel feeding method for thick and large castings, which has the following advantages:
(1) compared with the method of only adopting a riser to feed, the method has the problems of large metal consumption and more man-hours consumed for smelting, cutting and processing the casting head due to the requirement of larger size of the riser. The built-in cold metal feeding can be realized without arranging or adopting a small riser, the metal consumption and the riser cutting and processing cost are low, and the cost can be effectively saved.
(2) The casting has small shrinkage, short solidification time, less sand sticking of the casting and convenient cleaning.
Drawings
FIG. 1 is a schematic view of a casting process;
wherein: 1. casting cavity, 2, built-in cold metal and 3, riser.
Detailed Description
A solid metal feeding method for thick and large castings, as shown in fig. 1, comprising the following steps:
the method comprises the following steps: and (3) calculating the size and the shape of the casting thermal node by adopting procasting software.
Step two: according to the measured and calculated size and shape of the casting thermal node, the size and shape of the required metal block are formed by scaling down to 0.3 times. When the shape size of the metal block is about 0.3 times of the size of the hot spot, the metal block can be better fused with the metal at the hot spot, and the feeding effect is better. The metal block has too large size, is not easy to fuse and influences the integral solidification molding of the casting; if the size of the metal block is too small, the feeding effect is poor.
Step three: and processing the metal block with the same material as the casting according to the shape and the size determined in the step two.
Step four: fixing a metal block at the central position of a hot spot in a casting mould by using a metal wire or a bracket made of the same material as a casting;
step five: the metal block needs to be degreased and derusted, and is preheated before casting at the temperature of 250-300 ℃ before casting, so that the moisture on the surface of the metal block can be dried and the metal can be prevented from being oxidized by preheating, and the preheating is preferably carried out in the protective atmosphere of reducing gas. The preheating time is 5-10 min; ensuring the uniform heat penetration inside and on the surface of the metal block.
Step six: and (4) casting the casting mold in a mold closing manner, wherein the time interval between the casting and preheating is not more than 20 min. Avoiding the regeneration of condensed moisture on the metal surface during the time interval.
Step seven: and naturally cooling for 12 hours after casting, and fusing the metal block and the molten metal in the casting mould into a whole, solidifying together with the casting and forming a part of the casting. And after cooling, the casting is taken out after boxing.
The method can effectively eliminate shrinkage cavity and shrinkage porosity in the casting, and the compact casting can be obtained by matching with a smaller riser. Reduce metal consumption and processing time, and reduce production cost. Is suitable for thick and large non-important castings.
Claims (8)
1. A solid metal feeding method for thick and large castings is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: calculating the shape and size of the thermal node according to the shape and size of the casting;
step two: manufacturing a metal block with the same material as the casting; the shape of the metal block is similar to that of the thermal node;
step three: fixing the metal blocks in the dried sand mold;
step four: preheating the fixed metal block;
step five: after preheating is finished, molding the sand mold into a final mold;
step six: pouring molten metal into a mold;
step seven: and forming a casting after the molten metal is solidified and cooled.
2. The solid metal feeding method for the thick and large casting according to claim 1, characterized by comprising the following steps: in the first step, the size and the shape of the casting thermal node are measured and calculated through procasting software.
3. The solid metal feeding method for the thick and large casting according to claim 2, characterized in that: in the second step, the size of the metal block is 28% -30% of the size of the hot spot.
4. The solid metal feeding method for the thick and large casting according to claim 3, characterized in that: in the fourth step, the metal block is fixed by a bracket or a metal wire in a hoisting mode.
5. The solid metal feeding method for the thick and large casting according to claim 4, wherein the method comprises the following steps: the bracket or the metal wire is made of the same material as the casting.
6. The solid metal feeding method for the thick and large casting according to claim 1, characterized by comprising the following steps: in the fourth step, the preheating temperature of the metal block is 250-300 ℃; preheating time length: 5min to 10 min.
7. The solid metal feeding method for the thick and large casting according to claim 1, characterized by comprising the following steps: in the sixth step, the time interval after the pouring and the preheating is finished is not more than 20 min.
8. The solid metal feeding method for the thick and large casting according to claim 1, characterized by comprising the following steps: in the seventh step, the cooling mode is as follows: naturally cooling at room temperature for not less than 12 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210276070.4A CN114713800A (en) | 2022-03-21 | 2022-03-21 | Solid metal feeding method for thick and large casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210276070.4A CN114713800A (en) | 2022-03-21 | 2022-03-21 | Solid metal feeding method for thick and large casting |
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| CN114713800A true CN114713800A (en) | 2022-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210276070.4A Pending CN114713800A (en) | 2022-03-21 | 2022-03-21 | Solid metal feeding method for thick and large casting |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1280893A (en) * | 2000-08-07 | 2001-01-24 | 史保萱 | Casting technology by squeezing riser head for compensating shrink |
| CN1990135A (en) * | 2005-12-30 | 2007-07-04 | 广西玉柴机器股份有限公司 | Aluminum alloy diesel engine base casting die and casting method thereof |
| CN103223460A (en) * | 2013-04-11 | 2013-07-31 | 芜湖乐锐思信息咨询有限公司 | Sand core box for casting aluminum alloy gas inlet pipe |
| CN104889374A (en) * | 2015-06-01 | 2015-09-09 | 四川南车共享铸造有限公司 | Ductile cast iron casting piece structure with cooling fin and design method of same |
| CN106583657A (en) * | 2016-12-13 | 2017-04-26 | 山西平阳重工机械有限责任公司 | Solidification and feeding method for complicated annular thin-wall shell steel casting |
| CN107138707A (en) * | 2017-04-13 | 2017-09-08 | 中北大学 | The technique that metallic article crackle is eliminated using the local feeding of Combined Loading |
| CN108115096A (en) * | 2017-12-22 | 2018-06-05 | 天津万立鑫晟新材料技术研究院有限公司 | A kind of shrinkage compensation method of template casting |
| CN207508219U (en) * | 2017-10-24 | 2018-06-19 | 软控联合科技有限公司 | One kind is suitable for annular cast mixing casting feeding equipment |
| CN110722123A (en) * | 2019-11-29 | 2020-01-24 | 哈尔滨工业大学 | In-situ centrifugal casting equipment and method for alloy casting with thin-wall circular section |
| CN111097875A (en) * | 2019-11-26 | 2020-05-05 | 中国船舶重工集团公司第十二研究所 | Casting process of inner chill for accelerated solidification and cooling of thick and large investment castings |
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2022
- 2022-03-21 CN CN202210276070.4A patent/CN114713800A/en active Pending
Patent Citations (10)
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|---|---|---|---|---|
| CN1280893A (en) * | 2000-08-07 | 2001-01-24 | 史保萱 | Casting technology by squeezing riser head for compensating shrink |
| CN1990135A (en) * | 2005-12-30 | 2007-07-04 | 广西玉柴机器股份有限公司 | Aluminum alloy diesel engine base casting die and casting method thereof |
| CN103223460A (en) * | 2013-04-11 | 2013-07-31 | 芜湖乐锐思信息咨询有限公司 | Sand core box for casting aluminum alloy gas inlet pipe |
| CN104889374A (en) * | 2015-06-01 | 2015-09-09 | 四川南车共享铸造有限公司 | Ductile cast iron casting piece structure with cooling fin and design method of same |
| CN106583657A (en) * | 2016-12-13 | 2017-04-26 | 山西平阳重工机械有限责任公司 | Solidification and feeding method for complicated annular thin-wall shell steel casting |
| CN107138707A (en) * | 2017-04-13 | 2017-09-08 | 中北大学 | The technique that metallic article crackle is eliminated using the local feeding of Combined Loading |
| CN207508219U (en) * | 2017-10-24 | 2018-06-19 | 软控联合科技有限公司 | One kind is suitable for annular cast mixing casting feeding equipment |
| CN108115096A (en) * | 2017-12-22 | 2018-06-05 | 天津万立鑫晟新材料技术研究院有限公司 | A kind of shrinkage compensation method of template casting |
| CN111097875A (en) * | 2019-11-26 | 2020-05-05 | 中国船舶重工集团公司第十二研究所 | Casting process of inner chill for accelerated solidification and cooling of thick and large investment castings |
| CN110722123A (en) * | 2019-11-29 | 2020-01-24 | 哈尔滨工业大学 | In-situ centrifugal casting equipment and method for alloy casting with thin-wall circular section |
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