CN103752771A - Manufacturing method for lost foam casting of high-chrome agitator blade - Google Patents
Manufacturing method for lost foam casting of high-chrome agitator blade Download PDFInfo
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- CN103752771A CN103752771A CN201410020991.XA CN201410020991A CN103752771A CN 103752771 A CN103752771 A CN 103752771A CN 201410020991 A CN201410020991 A CN 201410020991A CN 103752771 A CN103752771 A CN 103752771A
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Abstract
The invention discloses a manufacturing method for lost foam casting of a high-chrome agitator blade. According to the method, the lost foam casting is adopted to mould and manufacture a core and a medium-frequency induction furnace is used for smelting molten iron, so that the qualified molten iron is smelted in the medium-frequency induction furnace; the method comprises the following steps: arranging a rare earth silicon alloy with the mass of the molten iron of 0.5% in a ladle in advance; crushing the rare earth silicon alloy into small blocks; pouring the molten iron into the ladle for modification; then casting and molding, and cleaning a casting; and finally, heating the high-chrome agitator blade in an electric box furnace so as to partially dissolve a carbide to obtain a matrix structure which takes bainite as a main body. Compared with an air-cooling quenching and low-temperature tempering process, the production process of the high-chrome agitator blade provided by the invention uses the modification of rare earth and quenching of an oil bath, so that the hardness of cast iron and the impact toughness can be obviously improved, and the wear resistance is obviously improved; the manufacturing method has the advantages of simplicity and convenience in process, easiness in operation, developed process, convenience in industrial production and low cost due to no adding of expensive molybdenum alloy.
Description
Technical field
The invention belongs to casting technology field, relate in particular to the manufacture method of the high chromium blade of stirrer of a kind of lost foam casting.
Background technology
Blade of stirrer is the key factor that affects mixer serviceability and service life, the common process of existing casting blade of stirrer is that dry quenching adds lonneal, the shortcoming that the casting technique of this routine exists is that hardness and the impact property of cast iron is not high, wear no resistance, affect to a great extent serviceability and the life-span of mixer.
Summary of the invention
The object of the present invention is to provide the manufacture method of the high chromium blade of stirrer of a kind of lost foam casting, be intended to improve hardness and the impact property of blade of stirrer, strengthen the wearability of blade of stirrer, improve the serviceability of mixer, extend the life-span of using blade.
The technical solution used in the present invention is as follows:
A manufacture method for the high chromium blade of stirrer of lost foam casting, comprises the heat treatment that adopts lost foam casting model coremaking, adopts medium-frequency induction furnace melt iron, RE Modified processing, casting, casting cleaning, foundry goods, and its concrete steps are as follows:
Step 1, the coremaking of employing lost foam casting model; According to the size of blade of stirrer, shape, adopt lost foam casting;
Step 2, employing medium-frequency induction furnace melt iron join by ratio carburant in medium-frequency induction furnace, steel scrap, and part ferroalloy, energising adds residue alloy after furnace charge melts again, and on-the-spot sample analysis is done in sampling, melts out qualified molten iron;
Step 3, RE Modified are processed; In ladle, put in advance the rare-earth silicon alloy of 0.5% molten steel quality, the broken frustillatum of rare-earth silicon alloy, pours the ladle processing of going bad by molten iron;
Step 4, casting; Molten iron after rotten processing is poured into the required workpiece of lost foam casting shape casting;
Step 5, casting cleaning; After molten steel solidification, case-opening goods-taking goes out blade, first blade is carried out to quality examination, chooses underproof blade and again melts down, and castings is cleared up; With hammering, knock off method or patterning method removal dead head, the scab of removing cast(ing) surface with shot-blasting machine, list edge; Foundry goods after polishing cleaning is delivered and is heat-treated;
The heat treatment of step 6, described foundry goods: high chromium blade of stirrer is heated to 950-1200 ℃ in cabinet-type electric furnace, by batch, determine temperature retention time, partially carbonized thing is dissolved, and then isothermal 5-10 minute in oil sump, obtains take lower bainite as main matrix.
Further, each chemical composition (WT%) of the molten iron melting out in step 2 is: C:2.6%-3.2%, and Si :≤0.5%, Mn:0.8%-1.0%, P :≤0.05%, S :≤0.05%, Cr:14%-18 %, Cu:0.5%-0.8%, surplus is Fe; Molten iron tapping temperature is 1600-1700 ℃.
Further, in step 6, in order more accurately to control the temperature in oil sump, heat treated workpiece need be put into oil sump in batches, and in oil sump, puts into cooling device, avoids temperature in oil sump to rise too high and causes its fire.
Useful technique effect of the present invention is as follows:
The production technology of high chromium blade of stirrer of the present invention is to RE Modified and adopt after oil sump quenching technical, and add lonneal technique with the dry quenching of former routine and compare, the hardness of cast iron, impact flexibility obviously improves, and wearability significantly increases; Manufacturing approach craft is easy, easy to operate, and technical maturity is convenient to suitability for industrialized production, and owing to not adding expensive alloys molybdenum, cost is low.
Accompanying drawing explanation
Fig. 1 is the manufacturing flow chart of the high chromium blade of stirrer of lost foam casting that provides of the embodiment of the present invention.
The specific embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the manufacturing process of the high chromium blade of stirrer of lost foam casting of the present invention, as shown in the figure,
S101: adopt lost foam casting model coremaking;
S102: adopt medium-frequency induction furnace melt iron;
S103: RE Modified is processed;
S104: casting;
S105: casting cleaning;
S106: the heat treatment of foundry goods.
A manufacture method for the high chromium blade of stirrer of lost foam casting, comprises the heat treatment that adopts lost foam casting model coremaking, adopts medium-frequency induction furnace melt iron, RE Modified processing, casting, casting cleaning, foundry goods, and its concrete steps are as follows:
Step 1, the coremaking of employing lost foam casting model; According to the size of blade of stirrer, shape, adopt lost foam casting;
Step 2, employing medium-frequency induction furnace melt iron join by ratio carburant in medium-frequency induction furnace, steel scrap, and part ferroalloy, energising adds residue alloy after furnace charge melts again, and on-the-spot sample analysis is done in sampling, melts out qualified molten iron;
Step 3, RE Modified are processed; In ladle, put in advance the rare-earth silicon alloy of 0.5% molten steel quality, the broken frustillatum of rare-earth silicon alloy, pours the ladle processing of going bad by molten iron;
Step 4, casting; Molten iron after rotten processing is poured into the required workpiece of lost foam casting shape casting;
Step 5, casting cleaning; After molten steel solidification, case-opening goods-taking goes out blade, first blade is carried out to quality examination, chooses underproof blade and again melts down, and castings is cleared up; With hammering, knock off method or patterning method removal dead head, the scab of removing cast(ing) surface with shot-blasting machine, list edge; Foundry goods after polishing cleaning is delivered and is heat-treated;
The heat treatment of step 6, described foundry goods: high chromium blade of stirrer is heated to 950-1200 ℃ in cabinet-type electric furnace, by batch, determine temperature retention time, partially carbonized thing is dissolved, and then isothermal 5-10 minute in oil sump, obtains take lower bainite as main matrix.
Each chemical composition (WT%) of the molten iron melting out in step 2 is: C:2.6%-3.2%, and Si :≤0.5%, Mn:0.8%-1.0%, P :≤0.05%, S :≤0.05%, Cr:14%-18 %, Cu:0.5%-0.8%, surplus is Fe; Molten iron tapping temperature is 1600-1700 ℃.
In step 6, in order more accurately to control the temperature in oil sump, heat treated workpiece need be put into oil sump in batches, and in oil sump, puts into cooling device, avoids temperature in oil sump to rise too high and causes its fire.
The production technology of high chromium blade of stirrer of the present invention is to RE Modified and adopt after oil sump quenching technical, and add lonneal technique with the dry quenching of former routine and compare, the hardness of cast iron, impact flexibility obviously improves, and wearability significantly increases; Manufacturing approach craft is easy, easy to operate, and technical maturity is convenient to suitability for industrialized production, and owing to not adding expensive alloys molybdenum, cost is low.
Although above-mentioned, by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that performing creative labour can make or distortion still within protection scope of the present invention.
Claims (3)
1. the manufacture method of the high chromium blade of stirrer of lost foam casting, it is characterized in that, comprise the heat treatment that adopts lost foam casting model coremaking, adopts medium-frequency induction furnace melt iron, RE Modified processing, casting, casting cleaning, foundry goods, its concrete steps are as follows:
Step 1, the coremaking of employing lost foam casting model; According to the size of blade of stirrer, shape, adopt lost foam casting;
Step 2, employing medium-frequency induction furnace melt iron join by ratio carburant in medium-frequency induction furnace, steel scrap, and part ferroalloy, energising adds residue alloy after furnace charge melts again, and on-the-spot sample analysis is done in sampling, melts out qualified molten iron;
Step 3, RE Modified are processed; In ladle, put in advance the rare-earth silicon alloy of 0.5% molten steel quality, the broken frustillatum of rare-earth silicon alloy, pours the ladle processing of going bad by molten iron;
Step 4, casting; Molten iron after rotten processing is poured into the required workpiece of lost foam casting shape casting;
Step 5, casting cleaning; After molten steel solidification, case-opening goods-taking goes out blade, first blade is carried out to quality examination, chooses underproof blade and again melts down, and castings is cleared up; With hammering, knock off method or patterning method removal dead head, the scab of removing cast(ing) surface with shot-blasting machine, list edge; Foundry goods after polishing cleaning is delivered and is heat-treated;
The heat treatment of step 6, described foundry goods: high chromium blade of stirrer is heated to 950-1200 ℃ in cabinet-type electric furnace, by batch, determine temperature retention time, partially carbonized thing is dissolved, and then isothermal 5-10 minute in oil sump, obtains take lower bainite as main matrix.
2. the manufacture method of the high chromium blade of stirrer of lost foam casting as claimed in claim 1, it is characterized in that, each chemical composition (WT%) of the molten iron melting out in step 2 is: C:2.6%-3.2%, Si :≤0.5%, Mn:0.8%-1.0%, P :≤0.05%, S :≤0.05%, Cr:14%-18 %, Cu:0.5%-0.8%, surplus is Fe; Molten iron tapping temperature is 1600-1700 ℃.
3. the manufacture method of the high chromium blade of stirrer of lost foam casting as claimed in claim 1, it is characterized in that, in step 6, in order more accurately to control the temperature in oil sump, heat treated workpiece need be put into oil sump in batches, and in oil sump, put into cooling device, avoid temperature in oil sump to rise too high and cause its fire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410020991.XA CN103752771A (en) | 2014-01-16 | 2014-01-16 | Manufacturing method for lost foam casting of high-chrome agitator blade |
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| CN201410020991.XA CN103752771A (en) | 2014-01-16 | 2014-01-16 | Manufacturing method for lost foam casting of high-chrome agitator blade |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104196022A (en) * | 2014-06-24 | 2014-12-10 | 安徽星亚冶金科技有限公司 | Production process for pile tips and pile caps of prestressed concrete square piles |
| CN104357731A (en) * | 2014-09-26 | 2015-02-18 | 安徽星亚冶金科技股份有限公司 | Manufacturing method for dust cover of concrete mixing machine |
| CN104550735A (en) * | 2015-02-08 | 2015-04-29 | 哈尔滨鑫润工业有限公司 | Precision casting method of last stage extra-long guide blade for million-kilowatt nuclear power unit |
| CN106583649A (en) * | 2016-12-21 | 2017-04-26 | 重庆市合川区银窝铸造厂 | Casting process for casting motorcycle engine cylinder block |
| CN112828542A (en) * | 2021-02-04 | 2021-05-25 | 颍上米克斯压力容器有限公司 | Manufacturing process and equipment of reaction kettle stirring sheet |
| CN116851649A (en) * | 2023-07-19 | 2023-10-10 | 平遥同妙机车有限公司 | Manufacturing method for casting low-carbon steel piece by adopting lost foam |
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| US4080198A (en) * | 1977-02-24 | 1978-03-21 | Abex Corporation | Erosion and corrosion resistant alloys containing chromium, nickel and molybdenum |
| JP3710053B2 (en) * | 2001-07-05 | 2005-10-26 | 大阪府 | Stainless spheroidal carbide cast iron material |
| CN1775983A (en) * | 2005-12-09 | 2006-05-24 | 长沙理工大学 | High-strength casted air-colled bainite wear-resisting steel and preparing method |
| CN101104196A (en) * | 2006-12-21 | 2008-01-16 | 安徽省安工机械制造有限公司 | Method for manufacturing high chromium white wear-resistant cast iron |
| CN102634726A (en) * | 2012-04-11 | 2012-08-15 | 安徽省安工机械制造有限公司 | Manufacturing method of agitating arm of agitator |
| CN103331417A (en) * | 2013-03-13 | 2013-10-02 | 武汉理工大学 | Cold mold module casting method |
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- 2014-01-16 CN CN201410020991.XA patent/CN103752771A/en active Pending
Patent Citations (6)
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| US4080198A (en) * | 1977-02-24 | 1978-03-21 | Abex Corporation | Erosion and corrosion resistant alloys containing chromium, nickel and molybdenum |
| JP3710053B2 (en) * | 2001-07-05 | 2005-10-26 | 大阪府 | Stainless spheroidal carbide cast iron material |
| CN1775983A (en) * | 2005-12-09 | 2006-05-24 | 长沙理工大学 | High-strength casted air-colled bainite wear-resisting steel and preparing method |
| CN101104196A (en) * | 2006-12-21 | 2008-01-16 | 安徽省安工机械制造有限公司 | Method for manufacturing high chromium white wear-resistant cast iron |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104196022A (en) * | 2014-06-24 | 2014-12-10 | 安徽星亚冶金科技有限公司 | Production process for pile tips and pile caps of prestressed concrete square piles |
| CN104357731A (en) * | 2014-09-26 | 2015-02-18 | 安徽星亚冶金科技股份有限公司 | Manufacturing method for dust cover of concrete mixing machine |
| CN104550735A (en) * | 2015-02-08 | 2015-04-29 | 哈尔滨鑫润工业有限公司 | Precision casting method of last stage extra-long guide blade for million-kilowatt nuclear power unit |
| CN106583649A (en) * | 2016-12-21 | 2017-04-26 | 重庆市合川区银窝铸造厂 | Casting process for casting motorcycle engine cylinder block |
| CN112828542A (en) * | 2021-02-04 | 2021-05-25 | 颍上米克斯压力容器有限公司 | Manufacturing process and equipment of reaction kettle stirring sheet |
| CN116851649A (en) * | 2023-07-19 | 2023-10-10 | 平遥同妙机车有限公司 | Manufacturing method for casting low-carbon steel piece by adopting lost foam |
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Application publication date: 20140430 |