CN100436001C - Process for manufacturing rare earth high-carbon low-alloy steel liner - Google Patents
Process for manufacturing rare earth high-carbon low-alloy steel liner Download PDFInfo
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- CN100436001C CN100436001C CNB2006100779389A CN200610077938A CN100436001C CN 100436001 C CN100436001 C CN 100436001C CN B2006100779389 A CNB2006100779389 A CN B2006100779389A CN 200610077938 A CN200610077938 A CN 200610077938A CN 100436001 C CN100436001 C CN 100436001C
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Abstract
The present invention discloses a process for producing rare-earth high-carbon low-alloy steel lining plates, which comprises a moulding process, a smelting process and a heat treatment process, wherein the moulding process comprises a green sand mould moulding process and an EPC vanishing mould moulding process; in the green sand mould moulding process, synthetic quartz sand with the granularity of 40 to 100 meshes is used as facing sand, the silica content is at least 98%, river sand is used as backing sand, the green sand is prepared from 100% of quartz sand, 7 to 8% of bentonite and 4 to 6% of water, the green sand is subpackaged and rammed, air eyelet are pricked, the mould is taken off, the green sand is reshaped, and the mould assembly is carried out; in the EPC vanishing mould moulding process, quartz sand is used and moulded by being vibrated by a one-dimensional vibration table; the smelting process adopts an acid furnace lining by using a double slag method; in the heat treatment process, a lining plate is heated to the temperature of 600 to 650 DEG C for 1 to 2 hours, heated to the temperature of 900 to 960 DEG C for 2 to 3 hours, cooled with water to the temperature of 380 to 420 DEG C cooled to the room temperature in the air, heated to the temperature of 200 to 400 DEG C for 3 to 5 hours and cooled in the air. The ball mill lining plate produced by the process for producing rare-earth high-carbon low-alloy steel lining plates of the present invention has the advantages of high abrasion resistance, no plastic deformation, low cost and convenient installation, and can not be easily broken.
Description
Technical field
The present invention relates to a kind of liner plate production technology, relate to a kind of process for manufacturing rare earth high-carbon low-alloy steel liner specifically.
Background technology
In China, the roller milling machine is used very universal, is widely used in industries such as metal mine, cement, power system.The ball grinding machine lining board material uses potassium steel more, but high manganese steel lining plate in use exists many problems, under the grinding operating mode of high manganese steel lining plate in ball mill, can not give full play to the ability of work hardening, wear no resistance, simultaneously because potassium steel flow drag is low, liner plate in use surface produces plastic deformation, and make interlock takes place between the liner plate, even bulk deformation, fastening bolt is broken, caused very difficulty of repair demolition.Also some producers uses high chrome cast iron lining plate, but that high chrome cast iron lining plate exists cost is higher, and shortcoming such as liner plate easy fracture.
Summary of the invention
For overcoming the deficiencies in the prior art, the invention provides a kind of process for manufacturing rare earth high-carbon low-alloy steel liner, this process using EPC lost foam casting process, by the liner plate long service life of this explained hereafter, the wearability height, cost is low, is easy to dismounting.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of process for manufacturing rare earth high-carbon low-alloy steel liner comprises formative technology, smelting process and Technology for Heating Processing;
Said formative technology comprises greensand mold formative technology and EPC disappearance model type technology, and said greensand mold processing step is as follows:
Mulling workshop section:
(1), the facing sand material adopts 40--100 order synthetic quartz sand, silicon content is not less than 98%, floor sand adopts river sand;
(2), material mixture ratio: quartz sand: 100%, bentonite: 7--8%, water: 4-6%;
(3), the mulling time can not be lower than 8 minutes;
The greensand mold formative technology:
(1), dress sand: the sandbox template is put well back dress sand, cover template and model 20--40 millimeter, with hand that sand is fixing once, refilling sand 15--30 millimeter can ramming;
(2), ramming: every case is pounded with tip and is pounded one time at least, and tack is pounded and pounded one time at least, refills sand, exceeds sandbox 35--45 millimeter, the real strickling of pounding;
(3), venting hole: its aperture is in 4-6 millimeter scope;
(4), molding: after case is pounded, can play top box, and template is tripped out;
(5), the apotype mould assembling: after apperance trips out, mend the flat real place that scratches when mending movable sand and withdrawing pattern of mending, mended case after, clean floating sand blast, detain case then;
Said EPC disappearance model type technology:
(1), the steel foundry molding sand adopts the dried quartz sand of 20-40 order, dioxide-containing silica is greater than 98%;
(2), adopt one dimension shake table vibration molding, in sandbox, insert the sand of some, vibration is wipeed off and is formed the casting bed of placing the EPS model;
(3), by technological requirement, the EPS model is placed on the casting bed in the sandbox, carry out the model assembling by casting technique requirements, and train sand and fix;
(4), after model fixes, add sand;
(5), sandbox is placed on carries out vibration ramming on the shake table, model is able to firmly;
Said smelting process process is as follows:
(1), smelting condition
Adopt 500 kilograms of medium-frequency induction furnaces (model: GGW--0.5,250KW) to smelt, adopt acid lining, double slag process is promptly moltenly made new slag after clear, carries out final deoxidizing and inserts the aluminium method;
The acid lining material is made refractory material with quartz sand, makes binding agent with boric acid;
Boric acid can adopt the 1.7-2.0% ratio, and the compound method of furnace lining material is with quartz sand and boric acid is dried mixes, and guiding humid medium should not add water during the knotting crucible as far as possible less;
(2), chemical composition:
Carbon 0.6%--0.9%, manganese 1%--2%, silicon＜1%, chromium 1%--2.5%, molybdenum 0.15%--0.55%, boron 0.0008%--0.0035%, rare earth 0.2%--0.6%, sulphur≤0.04%, phosphorus≤0.04%;
(3) charging method of furnace charge:
Crucible bottom some lumpiness of packing into are little, the furnace charge of consolidation adds in succession by its requirement, and slag charge accounts for 1.5% of furnace charge, add ferromanganese, add the rest parts steel scrap at last again, molten clear after, draw a design and carry out complete analysis, after result to be analyzed quotes, adjust composition, skim and carry out final deoxidizing, tapping temperature is controlled at when 1500 degree-1550 are spent and taps;
(4) cast, cleaning:
The liner plate that pours is through insulation, remove the surplus sand on the foundry goods, hand over inspection after the reconditioning, and heat-treat, Technology for Heating Processing is: liner plate is put into be heated to 600--650 ℃ of insulation 1-2 hour in the car-type cabinet-type electric furnace, be heated to 900--960 ℃ of insulation 23 hours again, water-cooled is to 380--420 ℃ afterwards, air cooling is to room temperature. carry out tempering then: liner plate is put in the well formula lonneal stove be heated to 200--400 ℃ of insulation 3-5 hour, air cooling;
The metallographic structure of heat treatment rear lining plate: martensite+bainite
The mechanical performance of steel ball: impact flexibility: 〉=10J/CM
2
Rockwell hardness (HRC) 〉=50.
The facing sand material of said greensand mold technology mulling workshop section adopts 40--70 order synthetic quartz sand, and silicon content is not less than 98%, and floor sand adopts river sand.
The facing sand material of said greensand mold technology mulling workshop section adopts 50--100 order synthetic quartz sand, and silicon content is not less than 98%, and floor sand adopts river sand.
Material mixture ratio the best of said greensand mold technology mulling workshop section is a quartz sand: 100%, and bentonite: 7%, water: 5%.
Said greensand mold formative technology:
(1), must cleaning good berth place before the operation, carry out the preparation before producing;
(2), dress sand: the sandbox template is put well back dress sand, cover template and model 20--40 millimeter, with hand that sand is fixing once, refilling sand 15--30 millimeter can ramming;
(3), ramming: every case is pounded with tip and is pounded one time at least, and tack is pounded and pounded one time at least, refills sand, exceeds sandbox 35--45 millimeter, the real strickling of pounding;
(4), venting hole: its aperture is in 4-6 millimeter scope;
(5), molding: after case was pounded, earlier from four direction activity top box case handle once, activity was not greater than 1 millimeter, can play top box, and activity apperance once is no more than 1 millimeter equally, and template is tripped out again;
(6), the apotype mould assembling: after apperance trips out, the scrutiny die cavity, flat real the mending of mending will be mended with spoon in the place that scratches when the sand of discovery activity and withdrawing pattern, drop in the time of preventing to detain case, mended case after, clean floating sand blast, detain case then.
The ramming in said the 3rd step of greensand mold formative technology is: every case is pounded twice with tip, tack is pounded one time, and first pass will gently be pounded with tip, protects model, when adorning flat sandbox with sand second time, be the desired strength height, good permeability, and also otherwise pound model, refill sand at last one time, exceed 40 millimeters in sandbox,, and wipe off with scraper plate with the plane reality of pounding.
Said EPC disappearance model type part technology is:
(1), the steel foundry molding sand adopts the dried quartz sand of 20-40 order, dioxide-containing silica must not contain splashings, micro mist, impurity and moisture etc. greater than 98%;
(2), adopt one dimension shake table vibration molding, in sandbox, insert the sand of some, vibration is wipeed off and is formed the casting bed of placing the EPS model, casting bed thickness will be decided on the foundry goods size;
(3), by technological requirement, the EPS model is placed on the casting bed in the sandbox, carry out the model assembling by casting technique requirements, and training sand fixes, the orientation of model placement must meet technological requirement;
(4), after model fixes, add sand, adding sand must evenly should evenly improve sand post height inside and outside the model, and the operator must be noted that and prevents to cause model deformation in the back-up sand process;
(5), sandbox is placed on carries out vibration ramming on the shake table, model is able to firmly.
(6), the dry sand casting mold after vibration, reach compacting effect, for keeping the casting mold behind the consolidation, the sandbox surface will seal with plastic sheeting, opens vavuum pump, forms negative pressure, prepares cast.
Said acid burden material is made refractory material with quartz sand, makes binding agent with boric acid.
Boric acid can adopt the 1.7-2.0% ratio, and the compound method of furnace lining material is with quartz sand and boric acid is dried mixes, and guiding humid medium should not add water during the knotting crucible as far as possible less.
Said Technology for Heating Processing is: liner plate is put into be heated to 600--650 ℃ of insulation 1-2 hour in the car-type cabinet-type electric furnace, be heated to 900--960 ℃ of insulation 2-3 hour again, water-cooled is to 380--420 ℃ afterwards, air cooling is to room temperature. carry out tempering then: liner plate is put in the well formula lonneal stove be heated to 200-400 ℃ of insulation 3-5 hour, air cooling.
The invention has the beneficial effects as follows that the ball grinding machine lining board wearability of producing with process of the present invention is strong, can not produce plastic deformation, easy fracture not, cost is low, simple installation.
The specific embodiment
A kind of process for manufacturing rare earth high-carbon low-alloy steel liner comprises formative technology, smelting process and Technology for Heating Processing;
Said formative technology comprises greensand mold formative technology and EPC disappearance model type technology, and said greensand mold processing step is as follows:
Mulling workshop section:
(1), the facing sand material adopts 40--100 order or 50-100 order synthetic quartz sand, silicon content is not less than 98%, floor sand adopts river sand;
(2), material mixture ratio: quartz sand: 100%, bentonite: 7%, water: 5%;
(3), the mulling time can not be lower than 8 minutes;
Said greensand mold formative technology:
(1), must cleaning good berth place before the operation, carry out the preparation before producing;
(2), dress sand: the sandbox template is put well back dress sand, cover template and model 20--40 millimeter, with hand that sand is fixing once, refilling sand 15--30 millimeter can ramming;
(3), ramming: every case is pounded twice with tip, tack is pounded one time, and first pass will gently be pounded with tip, protects model, when adorning flat sandbox with sand second time, be the desired strength height, good permeability, and also otherwise pound model, refill sand at last one time, exceed 40 millimeters in sandbox,, and wipe off with scraper plate with the plane reality of pounding;
(4), venting hole: its aperture is in 4-6 millimeter scope;
(5), molding: after case was pounded, earlier from four direction activity top box case handle once, activity was not greater than 1 millimeter, can play top box, and activity apperance once is no more than 1 millimeter equally, and template is tripped out again;
(6), the apotype mould assembling: after apperance trips out, the scrutiny die cavity, flat real the mending of mending will be mended with spoon in the place that scratches when the sand of discovery activity and withdrawing pattern, drop in the time of preventing to detain case, mended case after, clean floating sand blast, detain case then.
Said EPC disappearance model type part technology is:
(1), the steel foundry molding sand adopts the dried quartz sand of 20-40 order, dioxide-containing silica must not contain splashings, micro mist, impurity and moisture etc. greater than 98%;
(2), adopt one dimension shake table vibration molding, in sandbox, insert the sand of some, vibration is wipeed off and is formed the casting bed of placing the EPS model, casting bed thickness will be decided on the foundry goods size;
(3), by technological requirement, the EPS model is placed on the casting bed in the sandbox, carry out the model assembling by casting technique requirements, and training sand fixes, the orientation of model placement must meet technological requirement;
(4), after model fixes, add sand, adding sand must evenly should evenly improve sand post height inside and outside the model, and the operator must be noted that and prevents to cause model deformation in the back-up sand process;
(5), sandbox is placed on carries out vibration ramming on the shake table, model is able to firmly;
(6), the dry sand casting mold after vibration, reach compacting effect, for keeping the casting mold behind the consolidation, the sandbox surface will seal with plastic sheeting, opens vavuum pump, forms negative pressure, prepares cast.
Said smelting process process is as follows:
(1), smelting condition
Adopt 500 kilograms of medium-frequency induction furnaces (model: GGW--0.5,250KW) to smelt, adopt acid lining, double slag process is promptly moltenly made new slag after clear, carries out final deoxidizing and inserts the aluminium method;
The acid lining material is made refractory material with quartz sand, makes binding agent with boric acid;
Boric acid can adopt the 1.7-2.0% ratio, and the compound method of furnace lining material is with quartz sand and boric acid is dried mixes, and guiding humid medium should not add water during the knotting crucible as far as possible less;
(2), chemical composition:
Carbon 0.6%--0.9%, manganese 1%--2%, silicon＜1%, chromium 1%--2.5%, molybdenum 0.15%--0.55%, boron 0.0008%--0.0035%, rare earth 0.2%--0.6%, sulphur≤0.04%, phosphorus≤0.04%;
(3) charging method of furnace charge:
Crucible bottom some lumpiness of packing into are little, the furnace charge of consolidation adds in succession by its requirement, and slag charge accounts for 1.5% of furnace charge, add ferromanganese, add the rest parts steel scrap at last again, molten clear after, draw a design and carry out complete analysis, after result to be analyzed quotes, adjust composition, skim and carry out final deoxidizing, tapping temperature is controlled at when 1500 degree-1550 are spent and taps;
(4) cast, cleaning:
The liner plate that pours is through insulation, remove the surplus sand on the foundry goods, hand over inspection after the reconditioning, and heat-treat, Technology for Heating Processing is: liner plate is put into be heated to 600--650 ℃ of insulation 1-2 hour in the car-type cabinet-type electric furnace, be heated to 900--960 ℃ of insulation 2-3 hour again, water-cooled is to 380--420 ℃ afterwards, air cooling is to room temperature. carry out tempering then: liner plate is put in the well formula lonneal stove be heated to 200--400 ℃ of insulation 3-5 hour, air cooling;
The metallographic structure of heat treatment rear lining plate: martensite+bainite
The mechanical performance of steel ball: impact flexibility: 〉=10J/CM
2
Rockwell hardness (HRC) 〉=50.
Claims (2)
1, a kind of process for manufacturing rare earth high-carbon low-alloy steel liner is characterized in that: comprise formative technology, smelting process and Technology for Heating Processing;
Said formative technology comprises greensand mold formative technology or EPC disappearance model type technology, and said greensand mold processing step is as follows:
Mulling workshop section:
(1), the facing sand material adopts 40--100 order synthetic quartz sand, silicon content is not less than 98%, floor sand adopts river sand;
(2), the facing sand material mixture ratio: quartz sand: 100%, bentonite: 7--8%, water: 4-6%;
(3), the mulling time can not be lower than 8 minutes;
The greensand mold formative technology:
(1), dress sand: the sandbox template is put well back dress sand, cover template and model, exceed model 20--40 millimeter, with hand that sand is fixing once, refilling sand 15--30 millimeter can ramming;
(2), ramming: every case is pounded with tip and is pounded one time at least, and tack is pounded and pounded one time at least, refills sand, exceeds sandbox 35--45 millimeter, the real strickling of pounding;
(3), venting hole: its aperture is in 4-6 millimeter scope;
(4), molding: after case is pounded, can play top box, and template is tripped out;
(5), the apotype mould assembling: after apperance trips out, mend the flat real place that scratches when mending movable sand and withdrawing pattern of mending, mended case after, clean floating sand blast, detain case then;
Said EPC disappearance model type technology:
(1), the steel foundry molding sand adopts the dried quartz sand of 20-40 order, dioxide-containing silica is greater than 98%;
(2), adopt one dimension shake table vibration molding, in sandbox, insert the sand of some, vibration is wipeed off and is formed the casting bed of placing the EPS model;
(3), by technological requirement, the EPS model is placed on the casting bed in the sandbox, carry out model by casting technique requirements and assemble, and add sand in the sandbox and fix model;
(4), after model fixes, add sand;
(5), sandbox is placed on carries out vibration ramming on the shake table, model is able to firmly;
Said smelting process process is as follows:
(1), smelting condition
Adopt 500 kilograms of medium-frequency induction furnaces to smelt, adopt acid lining, double slag process, promptly furnace charge is made new slag after melting well, carries out final deoxidizing and inserts the aluminium method;
The acid lining material is made refractory material with quartz sand, makes binding agent with boric acid, and the granularity of quartz sand and percentage by weight are:
Furnace lining material: 5-6 millimeter, 22-28%; The 2-3 millimeter, 18-25%; 0.5-1 millimeter, 25-35%; Silica flour, 20-30%;
Stove neck material: 1-2 millimeter, 26-35%; 0.2-0.5 millimeter, 40-56%; Silica flour, 16-26%;
Boric acid can adopt the 1.7-2.0% ratio, and the compound method of furnace lining material is with quartz sand and boric acid is dried mixes, and guiding humid medium should not add water when making furnace lining as far as possible less;
(2), rare earth high-carbon low-alloy steel chemical composition:
Carbon 0.6%--0.9%, manganese 1%--2%, silicon＜1%, chromium 1%--2.5%, molybdenum 0.15%--0.55%, boron 0.0008%--0.0035%, rare earth 0.2%--0.6%, sulphur≤0.04%, phosphorus≤0.04%;
(3) charging method of furnace charge:
Crucible bottom some lumpiness of packing into are little, the furnace charge of consolidation adds in succession by its requirement, and slag charge accounts for 1.5% of furnace charge, add ferromanganese, add the rest parts steel scrap at last again, furnace charge is drawn a design and is carried out complete analysis after melting well, after result to be analyzed quotes, adjust composition, skim and carry out final deoxidizing, tapping temperature is controlled at when 1500 degree-1550 are spent and taps;
(4) cast, cleaning:
The liner plate that pours is through insulation, remove the surplus sand on the foundry goods, hand over inspection after the reconditioning, and heat-treat, Technology for Heating Processing is: liner plate is put into be heated to 600--650 ℃ of insulation 1-2 hour in the car-type cabinet-type electric furnace, be heated to 900--960 ℃ of insulation 2-3 hour again, water-cooled is to 380--420 ℃ afterwards, air cooling carries out tempering then to room temperature: liner plate is put in the well formula lonneal stove be heated to 200--400 ℃ of insulation 3-5 hour, air cooling;
The metallographic structure of heat treatment rear lining plate: martensite+bainite
The mechanical performance of steel ball: impact flexibility: 〉=10J/CM
2
Rockwell hardness (HRC) 〉=50.
2, process for manufacturing rare earth high-carbon low-alloy steel liner according to claim 1 is characterized in that: the facing sand material mixture ratio of said greensand mold technology mulling workshop section is best to be quartz sand: 100%, and bentonite: 7%, water: 5%.
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| CNB2006100779389A CN100436001C (en) | 2006-04-26 | 2006-04-26 | Process for manufacturing rare earth high-carbon low-alloy steel liner |
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| CNB2006100779389A CN100436001C (en) | 2006-04-26 | 2006-04-26 | Process for manufacturing rare earth high-carbon low-alloy steel liner |
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| CN101811076B (en) * | 2010-03-25 | 2011-09-28 | 河南科技大学 | Composite toothed plate and casting method thereof |
| CN102784886A (en) * | 2012-08-05 | 2012-11-21 | 胡立仁 | Casting method of lining plate of ball mill |
| WO2015147069A1 (en) * | 2014-03-26 | 2015-10-01 | 日立金属株式会社 | Green sand for casting of steel castings, method for producing same, and method for producing metal castings using said green sand |
| CN104972066A (en) * | 2015-06-15 | 2015-10-14 | 江苏万恒铸业有限公司 | Thin-shell sand culturing casting simple technology |
| CN107574384B (en) * | 2017-08-16 | 2020-08-14 | 垣曲县海晟铸钢厂 | Wear-resistant alloy steel lining plate and preparation method thereof |
| CN108326234A (en) * | 2018-01-03 | 2018-07-27 | 湖南精量重工科技有限公司 | A kind of sand mold formative technology |
| CN114378253A (en) * | 2022-01-12 | 2022-04-22 | 高唐县瑞升机械配件有限公司 | Carbon-free environment-friendly green sand casting process |
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| CN1059940A (en) * | 1991-06-24 | 1992-04-01 | 河北工学院 | High-toughness antiwear lining plate of big ball mill and manufacturing process thereof |
| CN1080327A (en) * | 1993-05-28 | 1994-01-05 | 青岛四海电力铸造厂 | Low-alloyed ball mill wearing liner plate and manufacturing process |
| CN1109384A (en) * | 1994-05-12 | 1995-10-04 | 河北机电学院 | Cast iron lining plate of ball mill and its producing method |
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