CN105671419A - Nodular cast iron for half-bridge axle housing of heavy high-power agricultural machinery and production method thereof - Google Patents
Nodular cast iron for half-bridge axle housing of heavy high-power agricultural machinery and production method thereof Download PDFInfo
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- CN105671419A CN105671419A CN201610208783.1A CN201610208783A CN105671419A CN 105671419 A CN105671419 A CN 105671419A CN 201610208783 A CN201610208783 A CN 201610208783A CN 105671419 A CN105671419 A CN 105671419A
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- iron
- ladle
- cast iron
- nodular cast
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses nodular cast iron for half-bridge axle housing of heavy high-power agricultural machinery. The nodular cast iron consists of the following chemical components in percentage by weight: 3.7-3.9% of carbon C, 2.6-2.8% of silicon Si, 0.3-0.45% of manganese Mn, less than or equal to 0.025% of sulfur S, less than or equal to 0.05% of phosphorus P, 0.04-0.065% of magnesium Mg, 0.03-0.04% of tin Sn and the balance of iron Fe. According to the specific production method, high-pressure multi-contact clay sand is adopted for moulding; the smelting process adopts a medium-frequency electric furnace; the spheroidizing temperature is relatively low; the dosing order of spheroidizing is the key point; after the spheroidizing, twice slagging-off is performed; and in ladle-to-ladle treatment, stream inoculation is performed and the pouring time is controlled to cast the nodular cast iron for half-bridge axle housing of heavy high-power agricultural machinery meeting the requirements. The nodular cast iron product obtained in the invention has the advantages of good mechanical properties, dense matrix structure, no addition of electrolytic copper, relatively low cost, high performance and low cost, facilitates market competition and is the best nodular cast iron for producing the half-bridge axle housing of heavy high-power agricultural machinery.
Description
Technical field:
The present invention relates to a kind of heavy high-horsepower farm machinery half axle shell spheroidal graphite cast-iron and production method thereof, belong to heavy high-horsepower farm machinery half axle shell production technical field.
Background technology:
Development along with Domestic Automotive Industry, the combination property of spheroidal graphite cast-iron is required more and more higher by heavy high-horsepower farm machinery half axle shell class part, want the cast condition ductile iron part of large batch of steady production height trade mark high tenacity, require to set up successive check from proportioning composition and production technology, difficulty is bigger, also taking into account production cost, this is the main cause causing many producers to be difficult to steady production simultaneously.
Summary of the invention:
The technical problem to be solved is: overcome the deficiency of existing production technology, a kind of heavy high-horsepower farm machinery half axle shell spheroidal graphite cast-iron and production method thereof are provided, by adopting alloy tin Sn to replace cathode copper, effectively reduce production cost, carry out stablizing lasting production, meet the demand of market and enterprise.
The present invention solves that technical problem is adopted the technical scheme that:
A kind of heavy high-horsepower farm machinery half axle shell spheroidal graphite cast-iron, its chemical composition is by weight percentage: carbon C3.7～3.9%, silicon Si2.6～2.8%, manganese Mn0.3～0.45%, sulfur S≤0.025%, phosphorus P≤0.05%, magnesium Mg0.04～0.065%, stannum Sn0.03～0.04%, surplus is ferrum Fe;
In this heavy type high-horsepower farm machinery half axle shell spheroidal graphite cast-iron:
Matrix metallographic: pearlite P >=20%, F≤80%, cementite 2, Oxygen potential 80%, graphite size: 5～6 grades;
Body mechanical property: tensile strength sigma b >=500MPa, elongation percentage δ >=7, Brinell hardness: 170～250HB, yield strength σ >=320.
The production method of described heavy high-horsepower farm machinery half axle shell spheroidal graphite cast-iron, its concrete technology flow process is as follows:
A, moulding operation: adopt high pressure multiple contact clay-bonded sand, fuse uses cold core 65L machine to get;With alcohol-base paint, all positions contacted with ferrum liquid of fuse are brushed; Core requires that aerofluxus is good, needs die cavity is cleaned out before mould assembling, and mould assembling gap must not exceed 1mm;
B, middle frequency furnace fusing operation: adopt 5 tons of middle frequency furnace continuous meltings, it is desirable to process is steady, tapping temperature 1550～1530 DEG C, and ferrum liquid component requirements is: carbon C3.8～4.0%, silicon Si1.4～1.8%, sulfur S≤0.05%, phosphorus P≤0.06%;
C, spectral component analysis: 5 tons of middle frequency furnaces heat up after stablizing, and are stirred by sample spoon in molten iron, after being fully warmed-up, insert the sampling of below molten iron 150mm depths and carry out spectrum analysis; If composition has deviation, then it is adjusted in electric furnace to step " B " predetermined component; After composition is qualified, ferrum liquid is poured into preparation spheroidising in nodularization bag;
D, spheroidising: adopt the common method that pours to carry out spheroidising, adding order is nodulizer Carson KM-60L, inovulant Carson KY-C, pretreating agent Carson's A level, then with slag rake these alloys carries out appropriateness consolidation, tapping temperature 1450～1500 DEG C,
Skim after E, nodularization: start first to be pulled down by scum silica frost, then spread the slag agent of appropriate collection to molten iron surface in bag, treat that melted laggard row is skimmed, skim and need to perform twice at, then take spectrum samples analysis;
After F, nodularization ladle sample are qualified, pouring into and carry out ladle-to-ladle current-following inoculation in pouring ladle, the addition of ladle-to-ladle inovulant is the 0.2～0.4% of weight of molten iron;
G, casting process: each nodularization bag duration of pouring, single case duration of pouring was 18～23s, and pouring temperature is 1375～1350 DEG C less than 10 minutes;
H, shake out time: according to cast iron weight, be generally latter more than 4 hours of cast, and after cast iron shakes out, depletion phase test block carries out Metallographic Analysis;
The cast iron that I, metallographic are qualified proceeds to dressing shop and clears up, and tests, and sprays antirust paint, packaging and warehousing.
In step " A ", the described mixed preparing that high pressure multiple contact clay-bonded sand is coal dust, bentonite and silica sand, the weight proportion of described coal dust, bentonite and silica sand is (1～3): (1～3): (1～3), wherein: described silicon sand size 40～70 order, clay content≤0.3%, moisture≤0.3%; Described coal dust requires moisture≤4%, ash≤10%, sulfur content≤2; Described bentonite requires Absorbance ratio-derivative method >=35g, moisture content≤12%.
The nodulizer Carson KM-60L of the present invention, inovulant Carson KY-C, pretreating agent Carson's A level, ladle-to-ladle inovulant Carson KY-C etc., provide by Chongqing Carson's founding materials company limited and produce.
The present invention actively has the beneficial effect that:
1, the production method of the present invention, by adopting alloy tin Sn to replace cathode copper, effectively reduce production cost, carry out stablizing lasting production, production process need not add cathode copper, namely the spheroidal graphite cast-iron that heavy high-horsepower farm machinery half axle shell that can be mass-produced is special, effectively reduces casting cost.
2, the production method of the present invention, by adopting relatively low nodularization temperature of coming out of the stove, is conducive to saving energy consumption, improving the beat of continuous-stable Foundry Production.
3, owing to adopting the one-tenth of the present invention to be grouped into and production method, and with relatively low spheroidization treatment temperature, making the heavy high-horsepower farm machinery half axle shell spheroidal graphite cast-iron that the present invention produces, function admirable, matrix are fine and close, can be widely applied to the middle rear axle housing of truck and produce.
4, the heavy high-horsepower farm machinery half axle shell cast condition ductile iron that the present invention produces, good mechanical performance, performance can reach the technical standard of QT500-7.
Detailed description of the invention:
Below in conjunction with specific embodiment, the present invention is made further explanation and description:
Embodiment: a kind of heavy high-horsepower farm machinery half axle shell spheroidal graphite cast-iron, its chemical composition is by weight percentage: carbon C3.7～3.9%, silicon Si2.6～2.8%, manganese Mn0.3～0.45%, sulfur S≤0.025%, phosphorus P≤0.05%, magnesium Mg0.04～0.065%, stannum Sn0.03～0.04%, surplus is ferrum Fe.
In this heavy type high-horsepower farm machinery half axle shell spheroidal graphite cast-iron:
Matrix metallographic: pearlite P >=20%, F≤80%, cementite 2, Oxygen potential 80%, graphite size: 5～6 grades;
Body mechanical property: tensile strength sigma b >=500MPa, elongation percentage δ >=7, Brinell hardness: 170～250HB, yield strength σ >=320.
The production method of heavy high-horsepower farm machinery half axle shell spheroidal graphite cast-iron recited above, its concrete technology flow process is as follows:
A, moulding operation: adopt high pressure multiple contact clay-bonded sand, fuse uses cold core 65L machine to get; With alcohol-base paint, all positions contacted with ferrum liquid of fuse are brushed; Core requires that aerofluxus is good, needs die cavity is cleaned out before mould assembling, and mould assembling gap must not exceed 1mm;
B, middle frequency furnace fusing operation: adopt 5 tons of middle frequency furnace continuous meltings, it is desirable to process is steady, tapping temperature 1550～1530 DEG C, and ferrum liquid component requirements is: carbon C3.8～4.0%, silicon Si1.4～1.8%, sulfur S≤0.05%, phosphorus P≤0.06%;
C, spectral component analysis: 5 tons of middle frequency furnaces heat up after stablizing, and are stirred by sample spoon in molten iron, after being fully warmed-up, insert the sampling of below molten iron 150mm depths and carry out spectrum analysis; If composition has deviation, then it is adjusted in electric furnace to step " B " predetermined component; After composition is qualified, ferrum liquid is poured into preparation spheroidising in nodularization bag;
D, spheroidising: adopt the common method that pours to carry out spheroidising, adding order is nodulizer Carson KM-60L, inovulant Carson KY-C, pretreating agent Carson's A level, then with slag rake these alloys carries out appropriateness consolidation, tapping temperature 1450～1500 DEG C,
Skim after E, nodularization: start first to be pulled down by scum silica frost, then spread the slag agent of appropriate collection to molten iron surface in bag, treat that melted laggard row is skimmed, skim and need to perform twice at, then take spectrum samples analysis;
After F, nodularization ladle sample are qualified, pouring into and carry out ladle-to-ladle current-following inoculation in pouring ladle, the addition of ladle-to-ladle inovulant is the 0.2～0.4% of weight of molten iron;
G, casting process: each nodularization bag duration of pouring, single case duration of pouring was 18～23s, and pouring temperature is 1375～1350 DEG C less than 10 minutes;
H, shake out time: according to cast iron weight, be generally latter more than 4 hours of cast, and after cast iron shakes out, depletion phase test block carries out Metallographic Analysis;
The cast iron that I, metallographic are qualified proceeds to dressing shop and clears up, and tests, and sprays antirust paint, packaging and warehousing.
In step " A ", the described mixed preparing that high pressure multiple contact clay-bonded sand is coal dust, bentonite and silica sand, the weight proportion of described coal dust, bentonite and silica sand is (1～3): (1～3): (1～3), wherein: described silicon sand size 40～70 order, clay content≤0.3%, moisture≤0.3%; Described coal dust requires moisture≤4%, ash≤10%, sulfur content≤2; Described bentonite requires Absorbance ratio-derivative method >=35g, moisture content≤12%.
The heavy high-horsepower farm machinery half axle shell foundry goods that the present invention produces, body good mechanical performance, matrix is fine and close, and cathode copper need not be added, less costly, high-performance, low cost, be conducive to the market competition of product, is the best cast condition ductile iron producing heavy high-horsepower farm machinery half axle shell.
Claims (3)
1. a heavy high-horsepower farm machinery half axle shell spheroidal graphite cast-iron, it is characterized in that: the chemical composition of this heavy type high-horsepower farm machinery half axle shell spheroidal graphite cast-iron is by weight percentage: carbon C3.7～3.9%, silicon Si2.6～2.8%, manganese Mn0.3～0.45%, sulfur S≤0.025%, phosphorus P≤0.05%, magnesium Mg0.04～0.065%, stannum Sn0.03～0.04%, surplus is ferrum Fe;
In this heavy type high-horsepower farm machinery half axle shell spheroidal graphite cast-iron:
Matrix metallographic: pearlite P >=20%, F≤80%, cementite 2, Oxygen potential 80%, graphite size: 5～6 grades;
Body mechanical property: tensile strength sigma b >=500MPa, elongation percentage δ >=7, Brinell hardness: 170～250HB, yield strength σ >=320.
2. the production method of the heavy high-horsepower farm machinery half axle shell spheroidal graphite cast-iron described in claim 1, its concrete technology flow process is as follows:
A, moulding operation: adopt high pressure multiple contact clay-bonded sand, fuse uses cold core 65L machine to get; With alcohol-base paint, all positions contacted with ferrum liquid of fuse are brushed; Core requires that aerofluxus is good, needs die cavity is cleaned out before mould assembling, and mould assembling gap must not exceed 1mm;
B, middle frequency furnace fusing operation: adopt 5 tons of middle frequency furnace continuous meltings, it is desirable to process is steady, tapping temperature 1550～1530 DEG C, and ferrum liquid component requirements is: carbon C3.8～4.0%, silicon Si1.4～1.8%, sulfur S≤0.05%, phosphorus P≤0.06%;
C, spectral component analysis: 5 tons of middle frequency furnaces heat up after stablizing, and are stirred by sample spoon in molten iron, after being fully warmed-up, insert the sampling of below molten iron 150mm depths and carry out spectrum analysis; If composition has deviation, then it is adjusted in electric furnace to step " B " predetermined component; After composition is qualified, ferrum liquid is poured into preparation spheroidising in nodularization bag;
D, spheroidising: adopt the common method that pours to carry out spheroidising, adding order is nodulizer Carson KM-60L, inovulant Carson KY-C, pretreating agent Carson's A level, then with slag rake these alloys carries out appropriateness consolidation, tapping temperature 1450～1500 DEG C,
Skim after E, nodularization: start first to be pulled down by scum silica frost, then spread the slag agent of appropriate collection to molten iron surface in bag, treat that melted laggard row is skimmed, skim and need to perform twice at, then take spectrum samples analysis;
After F, nodularization ladle sample are qualified, pouring into and carry out ladle-to-ladle current-following inoculation in pouring ladle, the addition of ladle-to-ladle inovulant is the 0.2～0.4% of weight of molten iron;
G, casting process: each nodularization bag duration of pouring, single case duration of pouring was 18～23s, and pouring temperature is 1375～1350 DEG C less than 10 minutes;
H, shake out time: according to cast iron weight, be generally latter more than 4 hours of cast, and after cast iron shakes out, depletion phase test block carries out Metallographic Analysis;
The cast iron that I, metallographic are qualified proceeds to dressing shop and clears up, and tests, and sprays antirust paint, packaging and warehousing.
3. the production method of heavy high-horsepower farm machinery half axle shell spheroidal graphite cast-iron according to claim 2, it is characterized in that: in step " A ", the described mixed preparing that high pressure multiple contact clay-bonded sand is coal dust, bentonite and silica sand, the weight proportion of described coal dust, bentonite and silica sand is (1～3): (1～3): (1～3), wherein: described silicon sand size 40～70 order, clay content≤0.3%, moisture≤0.3%; Described coal dust requires moisture≤4%, ash≤10%, sulfur content≤2; Described bentonite requires Absorbance ratio-derivative method >=35g, moisture content≤12%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610208783.1A CN105671419A (en) | 2016-04-06 | 2016-04-06 | Nodular cast iron for half-bridge axle housing of heavy high-power agricultural machinery and production method thereof |
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| CN201610208783.1A CN105671419A (en) | 2016-04-06 | 2016-04-06 | Nodular cast iron for half-bridge axle housing of heavy high-power agricultural machinery and production method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114182175A (en) * | 2021-12-02 | 2022-03-15 | 安徽天平机械股份有限公司 | Forklift drive axle housing and casting process thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04329823A (en) * | 1991-05-01 | 1992-11-18 | Senshiyuu:Kk | Production of mandrel made of ductile cast iron for crawler |
| JP3204293B2 (en) * | 1996-04-29 | 2001-09-04 | 日立金属株式会社 | Method of manufacturing spheroidal graphite cast iron member |
| JP5113104B2 (en) * | 2009-02-18 | 2013-01-09 | 株式会社栗本鐵工所 | Spheroidal graphite cast iron pipe and manufacturing method thereof |
| CN102965567A (en) * | 2012-11-22 | 2013-03-13 | 日月重工股份有限公司 | Casting thick large-section pearlite nodular cast iron and casting method thereof |
| CN103422009A (en) * | 2013-08-14 | 2013-12-04 | 辉县市汽车配件有限责任公司 | Nodular cast iron for rear axle housing of lorry and production method of nodular cast iron |
| CN104024449A (en) * | 2011-08-17 | 2014-09-03 | 马勒发动机零部件巴西有限公司 | Cylinder liner and cast iron alloy |
-
2016
- 2016-04-06 CN CN201610208783.1A patent/CN105671419A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04329823A (en) * | 1991-05-01 | 1992-11-18 | Senshiyuu:Kk | Production of mandrel made of ductile cast iron for crawler |
| JP3204293B2 (en) * | 1996-04-29 | 2001-09-04 | 日立金属株式会社 | Method of manufacturing spheroidal graphite cast iron member |
| JP5113104B2 (en) * | 2009-02-18 | 2013-01-09 | 株式会社栗本鐵工所 | Spheroidal graphite cast iron pipe and manufacturing method thereof |
| CN104024449A (en) * | 2011-08-17 | 2014-09-03 | 马勒发动机零部件巴西有限公司 | Cylinder liner and cast iron alloy |
| CN102965567A (en) * | 2012-11-22 | 2013-03-13 | 日月重工股份有限公司 | Casting thick large-section pearlite nodular cast iron and casting method thereof |
| CN103422009A (en) * | 2013-08-14 | 2013-12-04 | 辉县市汽车配件有限责任公司 | Nodular cast iron for rear axle housing of lorry and production method of nodular cast iron |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114182175A (en) * | 2021-12-02 | 2022-03-15 | 安徽天平机械股份有限公司 | Forklift drive axle housing and casting process thereof |
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Application publication date: 20160615 |