CN102094102A - Method for casting nodular cast iron with large section - Google Patents
Method for casting nodular cast iron with large section Download PDFInfo
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- CN102094102A CN102094102A CN2009101557026A CN200910155702A CN102094102A CN 102094102 A CN102094102 A CN 102094102A CN 2009101557026 A CN2009101557026 A CN 2009101557026A CN 200910155702 A CN200910155702 A CN 200910155702A CN 102094102 A CN102094102 A CN 102094102A
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a method for casting nodular cast iron with a large section. The carbon content and the number of graphite pebbles per unit area are increased, so that the problem of fragmented graphite can be solved; the ideal carbon content is 4.1 to 4.3 percent; the silicon content is 2.0 to 2.2 percent; instantaneous inoculation is added on the basis of the original inoculation, namely during pouring, pouring cup inoculation is performed by using 1 percent of No.75 silicon powder with the granularity of between 0.3 and 1mm; generally, common rare-earth-magnesium-silicon-iron alloy is used as nodulizer and has a wide application range, but during production of the nodular cast iron with the large section, decaying spheroidisation resistance and distortion-invariant capacity of the graphite are low; and in order to overcome the disadvantages, the improved scheme of D-2 heavy rare earth nodulizer is adopted, and during spheroidization, the common rare-earth-magnesium-silicon-iron alloy accounts for 60 percent and the D-2 heavy rare earth nodulizer accounts for 40 percent based on the total weight of the nodular cast iron. The method has the advantages that: the problems of graphite distortion, a small number of spheroidal graphite and fragmented graphite are solved, so that the spheroidization of the central position of a casting is improved and the requirement of a template of an injection molding machine can be fully met.
Description
Technical field
The castmethod of a kind of big section nodular graphite cast iron that the present invention relates to, concrete technical field belong to the foundry engieering that spheroidal graphite cast iron is produced injection moulding machine template.
Background technology
Injection moulding machine is to use very extensively at industrial circle, and many metals and plastics forming all need to use injection moulding machine, so the working strength of injection moulding machine is bigger.The template thickness that a lot of injection moulding machine manufacturers are adopted all is greater than 100mm, generally wall thickness is called big section nodular graphite cast iron greater than the nodular iron casting of 100mm.Because section is blocked up, speed of cooling is slow, makes at the foundry goods center or graphite morphology often appears in the thermal center place, and the spheroidal graphite number reduces, and organizes thickly, particularly easily produces fragment type graphite, and the foundry goods mechanical property is descended, and when serious, can cause scrapping of foundry goods.Usually produce spheroidal graphite cast iron and generally all adopt common rare earth magnesium ferrosilicon alloy, its main component rare earth: 4%-6% magnesium: 7%-9% silicon: 37%-44% calcium＜3% as nodulizing agent.Its applied range, but to producing in the big section nodular graphite cast iron often anti-decaying spheroidisation, graphite morphology ability.
Summary of the invention
The objective of the invention is production defective, provide a kind of solution graphite morphology, spheroidal graphite number to reduce, organize thick, make the castmethod of the improved a kind of big section nodular graphite cast iron of foundry goods centre nodularization at existing big section nodular graphite cast iron.
To achieve these goals, the problem of material appears in the foundry goods of avoiding producing, thereby carries out batching debugging repeatedly, obtains a result:
1, the control of carbon content: when the spheroidal graphite cast iron melting, increase carbon content, increase the number of graphite ball of unit surface, can help alleviating the chunky graphite problem like this, but increase with silicone content, can impel the formation of chunky graphite, comparatively the ideal carbon content is 4.1%-4.3%, and wherein silicone content is 2.0%～2.2%.
2, strengthen inoculation to preventing that occurring chunky graphite in the thick and large section casting parts also has important effect, therefore on original basis of breeding, increased instant inoculation, promptly when cast, the 75# silica flour with 1% (0.3-1mm granularity) carries out sprue cup and breeds.
3, nodulizing agent plays principal element to causing graphite morphology and decaying spheroidisation, generally all adopts common rare earth magnesium ferrosilicon alloy as nodulizing agent usually, its main component rare earth: 4%-6% magnesium: 7%-9% silicon: 37%-44% calcium＜3%.Its applied range, but to producing in the big section nodular graphite cast iron, often anti-decaying spheroidisation, graphite morphology ability are for overcoming its deficiency, adopt D-2 heavy rare earths nodulizing agent improvement project, its main component: yttrium: 2%-7% magnesium: 7%-9% silicon: 37%-44% calcium＜3% antimony: 0.3%.When spheroidizing, common rare earth magnesium ferrosilicon alloy accounts for 60%, and D-2 type heavy rare earths nodulizing agent accounts for 40%.
Beneficial effect of the present invention: solved graphite morphology, the spheroidal graphite number reaches fragment type graphite less, and the nodularization of foundry goods centre is improved, and can meet the requirement of injection moulding machine template fully.
Description of drawings (nothing)
Embodiment
The castmethod of big section nodular graphite cast iron of the present invention, concrete embodiment is as follows:
Order by the melting material adds coke, Wingdale, steel scrap, the new pig iron, foundry return, iron alloy, circulation successively, be added to till the lower edge of material mouth always, various metal layered material gross weights are 500 kilograms, every coke charge carbon thickness is 20cm, the add-on of coke charge is as the criterion with the height that can supply the burnt end, and Wingdale is added in the burner hearth center, and adding weight is 30%. of coke weight.Furnace charge installs back preheating beginning in 20 minutes air blast, observe and control stove internal combustion situation by the air port peep hole in the air blast process, according to adding charge, prepare when meeting the amount of tapping a blast furnace to tap a blast furnace, spheroidizing is prepared, earlier required on request, the total amount of packing into 40%D-2 type heavy rare earths, refill 60% rare earth alloy then, the 30%75# that covers the nucleating agent total amount above breeds silicon when waiting to tap a blast furnace (all the other 70% evenly be sprinkled into) in iron notch, cover perlite, and wait is tapped a blast furnace, after spheroidizing finishes, the temperature of stokehold check molten iron.Just begin cast after composition is qualified, treat that casting parts thermal insulation finishes the back and takes out foundry goods, carry out the knockout shot blasting, check back warehouse-in.
Claims (6)
1. the castmethod of a big section nodular graphite cast iron comprises melting and cast, it is characterized in that, except adding common carbon, element silicon, has also added rare earth alloy and D-2 heavy rare earths in addition as nodulizing agent when the spheroidal graphite cast iron melting.
2. the castmethod of big section nodular graphite cast iron according to claim 1 is characterized in that, when cast, the 75# silica flour with 1% carries out the sprue cup instant inoculation.
3. the castmethod of big section nodular graphite cast iron according to claim 1 is characterized in that, described carbon content is 4.1%-4.3%, and silicone content is 2.0%-2.2%.
4. the castmethod of big section nodular graphite cast iron according to claim 1 is characterized in that, described rare earth alloy comprises rare earth: 4%-6%, magnesium: 7%-9%, silicon: 37%-44%, calcium＜3%.
5. the castmethod of big section nodular graphite cast iron according to claim 1 is characterized in that, described D-2 heavy rare earths comprises yttrium: 2%-7%, magnesium: 7%-9%, silicon: 37%-44%, calcium＜3%, antimony: 0.3%.
6. the castmethod of big section nodular graphite cast iron according to claim 1 is characterized in that, described rare earth alloy accounts for 60% of nodulizing agent, and D-2 heavy rare earths accounts for 40% of nodulizing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101557026A CN102094102A (en) | 2009-12-15 | 2009-12-15 | Method for casting nodular cast iron with large section |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101557026A CN102094102A (en) | 2009-12-15 | 2009-12-15 | Method for casting nodular cast iron with large section |
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| CN102094102A true CN102094102A (en) | 2011-06-15 |
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| CN2009101557026A Pending CN102094102A (en) | 2009-12-15 | 2009-12-15 | Method for casting nodular cast iron with large section |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102382924A (en) * | 2011-10-20 | 2012-03-21 | 宁波康发铸造有限公司 | Nodulizing agent for nodular cast iron and preparation method thereof |
| CN102383027A (en) * | 2011-10-20 | 2012-03-21 | 宁波康发铸造有限公司 | Preparation method of nodular cast iron |
| CN102392175A (en) * | 2011-10-20 | 2012-03-28 | 宁波康发铸造有限公司 | Inoculant, preparation method thereof and application thereof in nodular cast iron smelting |
| CN102392094A (en) * | 2011-10-20 | 2012-03-28 | 宁波康发铸造有限公司 | Spheroidizing agent for spheroidal graphite cast iron, and preparation method thereof |
| CN102925615A (en) * | 2012-11-26 | 2013-02-13 | 哈尔滨理工大学 | Long-acting anti-recession nodulizer for thick large-section ductile iron |
| CN105349874A (en) * | 2015-10-29 | 2016-02-24 | 宁波康发铸造有限公司 | Preparation method for nodular cast iron |
| CN105401049A (en) * | 2015-10-29 | 2016-03-16 | 宁波康发铸造有限公司 | Spheroidizing agent and preparation method and application thereof in spheroidal graphite cast iron smelting |
| CN106111921A (en) * | 2016-08-31 | 2016-11-16 | 常州国茂鑫鳌机械有限公司 | Thin-walled flat-type gray iron casting anti-deformation process |
| CN109957632A (en) * | 2019-03-21 | 2019-07-02 | 南京镝峰复合材料有限公司 | A kind of nodulizer |
| CN111197115A (en) * | 2020-01-10 | 2020-05-26 | 芜湖久弘重工股份有限公司 | Spheroidizing method suitable for thick and large-section nodular iron castings |
| CN112760452A (en) * | 2020-12-24 | 2021-05-07 | 潍柴动力股份有限公司 | Yttrium-based heavy rare earth magnesium alloy core-spun yarn and application thereof in preparation of thick and large vermicular cast iron castings |
-
2009
- 2009-12-15 CN CN2009101557026A patent/CN102094102A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102383027B (en) * | 2011-10-20 | 2014-04-16 | 宁波康发铸造有限公司 | Preparation method of nodular cast iron |
| CN102383027A (en) * | 2011-10-20 | 2012-03-21 | 宁波康发铸造有限公司 | Preparation method of nodular cast iron |
| CN102392175A (en) * | 2011-10-20 | 2012-03-28 | 宁波康发铸造有限公司 | Inoculant, preparation method thereof and application thereof in nodular cast iron smelting |
| CN102392094A (en) * | 2011-10-20 | 2012-03-28 | 宁波康发铸造有限公司 | Spheroidizing agent for spheroidal graphite cast iron, and preparation method thereof |
| CN102382924A (en) * | 2011-10-20 | 2012-03-21 | 宁波康发铸造有限公司 | Nodulizing agent for nodular cast iron and preparation method thereof |
| CN102382924B (en) * | 2011-10-20 | 2013-02-20 | 宁波康发铸造有限公司 | Preparation method of nodulizing agent for nodular cast iron |
| CN102392175B (en) * | 2011-10-20 | 2014-02-12 | 宁波康发铸造有限公司 | Inoculant |
| CN102392094B (en) * | 2011-10-20 | 2014-02-12 | 宁波康发铸造有限公司 | Spheroidizing agent for spheroidal graphite cast iron, and preparation method thereof |
| CN102925615A (en) * | 2012-11-26 | 2013-02-13 | 哈尔滨理工大学 | Long-acting anti-recession nodulizer for thick large-section ductile iron |
| CN105349874A (en) * | 2015-10-29 | 2016-02-24 | 宁波康发铸造有限公司 | Preparation method for nodular cast iron |
| CN105401049A (en) * | 2015-10-29 | 2016-03-16 | 宁波康发铸造有限公司 | Spheroidizing agent and preparation method and application thereof in spheroidal graphite cast iron smelting |
| CN106111921A (en) * | 2016-08-31 | 2016-11-16 | 常州国茂鑫鳌机械有限公司 | Thin-walled flat-type gray iron casting anti-deformation process |
| CN106111921B (en) * | 2016-08-31 | 2018-04-10 | 常州国茂鑫鳌机械有限公司 | Thin-walled flat-type gray iron casting anti-deformation process |
| CN109957632A (en) * | 2019-03-21 | 2019-07-02 | 南京镝峰复合材料有限公司 | A kind of nodulizer |
| CN111197115A (en) * | 2020-01-10 | 2020-05-26 | 芜湖久弘重工股份有限公司 | Spheroidizing method suitable for thick and large-section nodular iron castings |
| CN112760452A (en) * | 2020-12-24 | 2021-05-07 | 潍柴动力股份有限公司 | Yttrium-based heavy rare earth magnesium alloy core-spun yarn and application thereof in preparation of thick and large vermicular cast iron castings |
| CN112760452B (en) * | 2020-12-24 | 2022-09-23 | 潍柴动力股份有限公司 | Yttrium-based heavy rare earth magnesium alloy core-spun yarn and application thereof in preparation of thick and large vermicular cast iron castings |
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Application publication date: 20110615 |