CN102873282A - Point casting process for large metal cast ingots - Google Patents
Point casting process for large metal cast ingots Download PDFInfo
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- CN102873282A CN102873282A CN2012103744584A CN201210374458A CN102873282A CN 102873282 A CN102873282 A CN 102873282A CN 2012103744584 A CN2012103744584 A CN 2012103744584A CN 201210374458 A CN201210374458 A CN 201210374458A CN 102873282 A CN102873282 A CN 102873282A
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Abstract
The invention aims to provide a casting process for large-size metal cast ingots. A repeated point casting method is adopted in the process, a cast ingot is subjected to repeated casting, after a certain height of molten steel is cast in a casting mold and is solidified for a certain period, molten steel is cast from the top of the casting mold to a shrinkage and loose region, the degree of overheat of cast molten metal and the quantity of the cast molten steel are controlled so that unevenly solidified metal is melted by heat carried by the molten metal and the molten steel, the content of segregation elements in newly injected molten metal is higher than the target content of segregation elements in the cast ingot, and the requirement on the target content of the segregation elements in the cast ingot cab be met after the newly injected molten metal is mixed with the metal which is melted again. The same casting process is repeated until the casting mold is full. The process can control a segregation index of the elements to be zero and loose and shrinkage indexes to be lower than 0.5 grade.
Description
Technical field
The present invention relates to the pouring technology of the large ingot casting of an a kind of metal-pouring technique, belong to the metallurgical casting field, this pouring technology can be revised element segregation in the ingot casting, reduce shrinkage cavity and the rarefaction defect of ingot casting, significantly improves the quality of large scale ingot casting.
Background technology
Permanent mold casting is a kind of important method of casting.The foundry goods good mechanical property that permanent mold casting is produced, surface accuracy and highly polished, quality and dimensionally stable, the casting process recovery rate is high, and the liquid metals consumption is few, and production efficiency is high, and the metal mold life-span is long, good work environment, labour intensity is little.In recent years, along with the development of the industries such as forging industry, electric power, large-sized ingot casting more and more is subject to the favor in market, and element segregation, shrinkage cavity, the problem such as loose are also more outstanding in large scale ingot casting casting process.
Element different solubility in solid liquid phase causes the segregation of element, element segregation can cause product the even transformation of tissue odds to occur in subsequent heat treatment, intermediate annealing process, thereby in next step processing, brittle fracture occurs and become waste product, so its harm is especially serious.Shrinkage cavity and loose be ingot casting by liquid phase molten steel volume contraction and defective of causing in the solid transformation process.Shrinkage cavity and the loose compactness that has a strong impact on ingot casting, the net sectional area of minimizing ingot casting reduces mechanical property greatly.Even have in some cases not excise the ingot casting that has defect part, when defective is serious, have to scrap steel ingot, bring huge economic loss to production.
Except defective is controlled to rising head, then excision does not have extraordinary way to control the segregation of element in the large scale ingot casting, loose and shrinkage cavity at present.Patent employing of the present invention is repeatedly put pouring technique and is poured into a mould the large scale ingot casting, can revise element segregation on the one hand, on the other hand can also fine control shrinkage cavity and loose.
Summary of the invention
The object of the present invention is to provide a kind of pouring technology that can revise component segregation, reduce loose and shrinkage cavity, the die casting casting divides to be finished for 3-5 time, and casting adopts long nozzle directly to pour into a mould to rejected region; For the first time the casting molten metal composition is the target component of ingot casting, and the liquation composition of casting later on all is lower than target component, makes it to reach target component after the segregated solidification metal mixed with again fusing.
The present invention can revise the component segregation that solidifies part by hole irrigation repeatedly, significantly reduce loose and shrinkage cavity, and the present device investment is low, and technique easily realizes.
(4) description of drawings
Figure below is used for being further used as with reference to description the present invention, yet is not limited to the description of figure below, wherein:
Fig. 1: metal dots pouring technique schematic diagram;
Among the figure: the even solidification zone of 1-; The non-homogeneous solidification zone of 2-; The 3-defect area; 4-is the cast zone; 5-hole irrigation device;
(5) specific implementation method
Repeatedly hole irrigation method is adopted in this invention, and the molten steel when cast certain altitude in mold can be divided into 4 zones in the mold: 1 is even resolidified region; 2 element segregation solidification zone; 3) shrinkage cavity, loose domain of the existence; 4) be the cast zone.After solidifying a period of time, continuation is poured into a mould from the top to 3 zones, the amount of the degree of superheat of the molten metal of control cast and injection molten steel makes the heat of bringing into zone 2 metal moltens that solidify, the target component that is higher than ingot casting with the segregation element composition of the metallic solution of stylish injection, composition satisfied the target component of ingot casting when the molten metal in the molten metal of new injection and 2 districts was mixed.Repeat above casting process until mold is watered full.
The implementation method of hole irrigation method at first is described as example as the high-carbon steel ingot casting of 1.05.% to pour into a mould a 100t carbon target content.Cast need to use two ladles connect casting complete, and the molten steel one bag carbon content that was ready to two kinds of carbon contents before casting is target component, and another bag carbon content is lower than target component and selects in implementation process then that carbon content is 0.95%.Pour into a mould first for the first time the 70t molten steel, then taking a sample rapidly and recording the content of talking the line of segragation is 1.1%, the segregation zone accounts for 1/3rd volumes of ingot casting, for the 25t molten steel is poured into a mould in the correction that reaches segregation zone carbon for the second time again, cast finish to record line of segragation carbon content be 1.08%, so pour into a mould again for the third time 0.95% molten steel 5t.The carbon content that obtains at last the ingotism place is 1.06%, does not find central pipe in the ingot casting.
The weight of ingot casting is 170t, and the carbon target content is 2.0%.Cast needs to use two ladles to connect casting complete, and the molten steel one bag carbon content that was ready to two kinds of carbon contents before casting is target component, and another bag carbon content is lower than target component, and selecting then in implementation process, carbon content is 1.8%.
Pour into a mould first for the first time the 75t molten steel, then the content that records line of segragation carbon of taking a sample rapidly is 2.5%, the segregation zone accounts for 1/3rd volumes of ingot casting, for the 60t molten steel is poured into a mould in the correction that reaches segregation zone carbon for the second time again, the content that the cast end records line of segragation carbon is 2.3%, the segregation that produces when pouring into a mould for the second time in order to revise, pour into a mould again for the third time 1.8% molten steel 30t, the carbon content that obtains the ingotism place is 2.1%, the segregation that produces when pouring into a mould for the third time in order to revise, pour into a mould 5t the 4th time, the carbon content that obtains at last the ingotism place is 2.02% again, does not find not find in the central pipe ingot central pipe in the ingot casting.
The weight of ingot casting is 265t, and the carbon target content is 3.0%.Cast needs to use two ladles to connect casting complete, and the molten steel one bag carbon content that was ready to two kinds of carbon contents before casting is target component, and another bag carbon content is lower than target component, and selecting then in implementation process, carbon content is 2.8%.Pour into a mould first for the first time the 90t molten steel, then the content that records line of segragation carbon of taking a sample rapidly is 3.6%, the segregation zone accounts for 1/3rd volumes of ingot casting, for the 90t molten steel is poured into a mould in the correction that reaches segregation zone carbon for the second time again, the content that the cast end records line of segragation carbon is 3.4%, the segregation that produces when pouring into a mould for the second time in order to revise, pour into a mould again for the third time 2.8% molten steel 60t, the carbon content that obtains the ingotism place is 3.2%, the segregation that produces when pouring into a mould for the third time in order to revise, pour into a mould again 20t the 4th time, the carbon content that obtains the ingotism place is 3.1%, and for the segregation of revising the 4th time when cast producing, the 5th is poured into a mould 5t again, the carbon content that obtains at last the ingotism place is 3.03.%, does not find not find in the central pipe ingot central pipe in the ingot casting.
Claims (1)
1. large ingot casting point pouring technique of metal is characterized in that the die casting casting finishes minute 3-5 time, and casting employing long nozzle is directly poured into a mould to rejected region; For the first time the casting molten metal composition is the target component of ingot casting, and the liquation composition of casting later on all is lower than target component, makes it to reach target component after the segregated solidification metal mixed with again fusing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103744584A CN102873282A (en) | 2012-09-27 | 2012-09-27 | Point casting process for large metal cast ingots |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012103744584A CN102873282A (en) | 2012-09-27 | 2012-09-27 | Point casting process for large metal cast ingots |
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| CN102873282A true CN102873282A (en) | 2013-01-16 |
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| CN2012103744584A Pending CN102873282A (en) | 2012-09-27 | 2012-09-27 | Point casting process for large metal cast ingots |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866140A (en) * | 2014-03-26 | 2014-06-18 | 李霞 | Segregation-method continuous ingot casting device |
| CN105665657A (en) * | 2016-02-23 | 2016-06-15 | 上海交通大学 | Discrete casting method for preparing homogenized cast ingot |
| CN105945246A (en) * | 2016-05-12 | 2016-09-21 | 上海交通大学 | Dispersion additive casting method for preparing homogenized ingot by use of variable components |
| CN114134443A (en) * | 2021-08-03 | 2022-03-04 | 株洲冶炼集团股份有限公司 | Method for reducing segregation of aluminum element in hot-dip galvanized alloy large ingot |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1315005A (en) * | 1969-05-08 | 1973-04-26 | Kobe Steel Ltd | Method for manufacturing sound steel ingots |
| JPS61123445A (en) * | 1984-11-20 | 1986-06-11 | Kawasaki Steel Corp | Production of steel ingot for extra-thick steel plate |
| CN101508018A (en) * | 2009-03-25 | 2009-08-19 | 中国科学院金属研究所 | Method for preventing heavy steel ingot from liquating by different pouring ladles |
| CN102166632A (en) * | 2011-04-29 | 2011-08-31 | 中国第一重型机械股份公司 | Casting method of large-scale steel ingot |
-
2012
- 2012-09-27 CN CN2012103744584A patent/CN102873282A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1315005A (en) * | 1969-05-08 | 1973-04-26 | Kobe Steel Ltd | Method for manufacturing sound steel ingots |
| JPS61123445A (en) * | 1984-11-20 | 1986-06-11 | Kawasaki Steel Corp | Production of steel ingot for extra-thick steel plate |
| CN101508018A (en) * | 2009-03-25 | 2009-08-19 | 中国科学院金属研究所 | Method for preventing heavy steel ingot from liquating by different pouring ladles |
| CN102166632A (en) * | 2011-04-29 | 2011-08-31 | 中国第一重型机械股份公司 | Casting method of large-scale steel ingot |
Non-Patent Citations (1)
| Title |
|---|
| 贾乃昌: "210吨锻造钢锭的多炉联合真空浇注", 《大型铸锻件》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866140A (en) * | 2014-03-26 | 2014-06-18 | 李霞 | Segregation-method continuous ingot casting device |
| CN103866140B (en) * | 2014-03-26 | 2015-04-22 | 李霞 | Segregation-method continuous ingot casting device |
| CN105665657A (en) * | 2016-02-23 | 2016-06-15 | 上海交通大学 | Discrete casting method for preparing homogenized cast ingot |
| CN105945246A (en) * | 2016-05-12 | 2016-09-21 | 上海交通大学 | Dispersion additive casting method for preparing homogenized ingot by use of variable components |
| CN114134443A (en) * | 2021-08-03 | 2022-03-04 | 株洲冶炼集团股份有限公司 | Method for reducing segregation of aluminum element in hot-dip galvanized alloy large ingot |
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Application publication date: 20130116 |