CN1144890C - Manufacture of heat-resistant discharge manifold of compacted graphite cast iron - Google Patents
Manufacture of heat-resistant discharge manifold of compacted graphite cast iron Download PDFInfo
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- CN1144890C CN1144890C CNB001257609A CN00125760A CN1144890C CN 1144890 C CN1144890 C CN 1144890C CN B001257609 A CNB001257609 A CN B001257609A CN 00125760 A CN00125760 A CN 00125760A CN 1144890 C CN1144890 C CN 1144890C
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- Prior art keywords
- wriggling
- iron
- pouring
- alloy
- discharge manifold
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
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Abstract
The present invention relates to a manufacture method of a heat resistance discharge manifold of compacted graphite cast iron. The manufacture method comprises the following technical steps: a proportioning step, a smelting step, a casting step, a ramaway step, etc. The present invention is characterized in that the present invention adopts a vermicular treatment technology of a line feeding method in a slot. Compared with the prior art, the present invention has the advantages of simple operation, easy control of the process, high qualification rate of products, etc.
Description
The present invention relates to novel casting material applied technical field, relate in particular to a kind of manufacture method of heat-resisting vermicular cast iron discharge manifold.
Before 1975, the discharge manifold of most of motor car engines is worked under≤500 ℃ of temperature, and the material of therefore making discharge manifold is the low-alloy gray iron mostly.Over nearly 25 years, owing to prevent the needs of exhaust emission and raising motor efficiency, engine exhaust temperature improves constantly, and the requirement to the anti-oxidant of material and high temperature resistance fatigue is progressively improved.Vermicular cast iron and ferrite ductile cast iron begin to be applied to discharge manifold, and its working temperature can be brought up to 650 ℃ and 760 ℃.But the development of motor car engine means that engine combustion temperatures is higher, especially adopt after the turbocharging technology, require the temperature of discharge manifold to surpass 760 ℃ as Ford Motor Company, 2.2 liters of turbosupercharged engine discharge manifolds of Chrysler wall temperature has surpassed 816 ℃ in the experiment of 2400 circulation lasting motive forces.
First silicon (Si) molybdenum (Mo) heat-resisting ductile iron vapor pipe appearred on the Laser of U.S.'s Chrysler in 1984, this cast iron is to develop for the high strength material needs that satisfy operation at high temperature, the vapor pipe of most of american car has all adopted silicon-molybdenum ductile iron since the nineties, and Europe germany volkswagen and Audi company have then adopted silicon molybdenum vermicular cast iron vapor pipe.
The silicon molybdenum is wriggled iron (magnesium iron) owing to contain 4 ~ 5% silicon and 0.5 ~ 0.1% molybdenum, guaranteed the oxidation-resistance under the high temperature, improved yield strength and the creep resisting ability under the high temperature, quasiflake graphite and ferrite matrix have guaranteed good thermal conductivity and thermal shock resistance, thereby can work below 870 ℃.But this material contracts tendency is big, and mobile poor, casting manufacturability is poor, and upward difficulty is very big to the even vapor pipe production technique of thin-walled and inhomogeneity of wall thickness and control.
At present, heat-resisting ductile iron (iron of the wriggling) vapor pipe that the automobile vendor in North America and Europe produces all adopts traditional horizontal parting foundry production line and converter-type ladle pouring type, this manufacture method is narrow to the chemical control system of the wriggling scope of material, precision and operational requirement to equipment are all very high, if control badly, cause producing instability easily, situation that scrap rate is high takes place.
Purpose of the present invention be exactly provide in order to overcome the defective that above-mentioned prior art exists a kind of simple to operate, be easy to control, the manufacture method of heat-resisting vermicular cast iron vapor pipe that scrap rate is low.
Purpose of the present invention can realize in the following manner: a kind of manufacture method of heat-resisting vermicular cast iron discharge manifold, be characterized in, and comprise following processing step:
1) pig iron, steel scrap, foundry returns and iron alloy are prepared burden by following weight composition as metal charge:
C 3.0～3.6％
Si 3.9～4.3％
Mn ≤0.3％
P ≤0.07％
S ≤0.02％
Ti ≤0.20％
Mo 0.4～0.7％
Ni ≤0.60％
Fe all the other
And adding the induction furnace fusing, 1510 °～1560 ℃ of the molten iron temperatures of coming out of the stove are as the base iron before the wriggling processing;
2) base iron that will meet above requirement is quantitatively poured 1.5 tons of hot metal ladle into, is transported to the air pressure insulated pouring stove place of 5 tons of capacity by rotating fork truck, after manually skimming, pours in this air pressure insulated pouring stove;
3) the vertical extrusion moduling automation line of enlightening sand (DISA) is made the discharge manifold sand mold continuously and they is pushed under the press pouring furnace with the speed of 230～280 types per hour;
4) molten iron in the air pressure insulated pouring stove is depressed into the stopper rod hole of also passing through the pouring basin end in the pouring basin by automatic air pressure control, pours into sand mold;
5) after molten iron is pressed into pouring basin, the chemical combination gold thread of will wriggling is sent into wriggling processing in the pouring basin molten iron by feeding wire machine with 3～4 meters/minute speed;
Rationally adjust wire-feeding velocity by the productive temp of DISA mo(u)lding line when 6) pouring into a mould, and regularly skim, regularly detect wriggling of molten iron situation by quick metallurgical analysis;
7) by the stopper rod system of industrial television and computer controlled automatic, make by the molten iron after the wriggling of alloy wire and pour into sand mold, obtain the discharge manifold foundry goods after unpacking through cooling off.
The described chemical combination gold thread of wriggling is by covering machine the 3# alloy of wriggling to be bundled into the alloy claded wire that diameter is 9mm by 0.25 * 41.5mm steel band, and comprising the 3# alloy amount of wriggling in every meter alloy wire is 140～150 grams, and the described 3# alloy weight composition of wriggling is:
Mg 5.5～6.5％
Si 44～48％
Ca 1～2％
Al 1～1.2％
Re 0.6～1.0％
Fe all the other
Granularity is 0.5～1.5mm.
Compare with existing vermicular cast iron manufacturing technology, the present invention adopts under vertical Molding Casting production line of DISA and the automatic air pressure pouring furnace production in enormous quantities condition and adopts " injection feeding technology in the groove " wriggling processing, it is narrow fundamentally to have solved the material chemical control system scope of wriggling, be difficult to organize the problem of stably manufactured, avoided the vermiculation phenomenon fully.Vermiculizer of the present invention adopts based on the low rare earth alloy of low magnesium of magnesium and the titanium acting in conjunction in the adding molten iron, makes it can satisfy the requirement of discharge manifold thin-walled place nodulizing rate 〉=50%, has satisfied the qualified requirement of heavy wall place mechanical property again simultaneously.The present invention is simple to operate, and process is easy to control, product percent of pass height.
Fig. 1 is a process flow sheet of the present invention.
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail:
Embodiment 1
Present embodiment adopts the interior injection feeding technology of groove at DISA mo(u)lding line high-speed molding, and stably produces the heat-resisting vermicular cast iron discharge manifold of the car product that high quality requires under the condition of press pouring furnace automatic casting molten iron.Concrete manufacturing technology steps is as follows:
1) pig iron, steel scrap, foundry returns and iron alloy are prepared burden by following weight composition as metal charge:
C 3.6％
Si 4.3％
Mn 0.3％
P 0.07％
S 0.02％
Ti 0.20％
Mo 0.7％
Ni 0.60％
Fe all the other
And adding the induction furnace fusing, 1560 ℃ of the molten iron temperatures of coming out of the stove are as the base iron before the wriggling processing.
2) base iron that will meet above requirement is quantitatively poured 1.5 tons of hot metal ladle into, is transported to the air pressure insulated pouring stove place of 5 tons of capacity by rotating fork truck, after manually skimming, pours in this air pressure insulated pouring stove.
3) the vertical extrusion moduling automation line of enlightening sand (DISA) is made the discharge manifold sand mold continuously and is pushed under the press pouring furnace with the speed of 280 types per hour.
4) molten iron in the air pressure insulated pouring stove is depressed into the stopper rod hole of also passing through the pouring basin end in the pouring basin by automatic air pressure control, pours into sand mold.
5) after molten iron is pressed into pouring basin, the chemical combination gold thread of will wriggling is sent into wriggling processing in the pouring basin molten iron by feeding wire machine with 4 meters/minute speed.The described chemical combination gold thread of wriggling is by covering machine the 3# alloy of wriggling to be bundled into the alloy claded wire that diameter is 9mm by 0.25 * 41.5mm steel band, and comprising the 3# alloy amount of wriggling in every meter alloy wire is 150 grams, and the described 3# alloy weight composition of wriggling is:
Mg 6.5％
Si 48％
Ca 2％
Al 1.2％
Re 1.0％
Fe all the other
Granularity is 1.5mm.
Rationally adjust wire-feeding velocity by the productive temp of DISA mo(u)lding line when 6) pouring into a mould, and regularly skim, regularly detect wriggling of molten iron situation by quick metallurgical analysis.
7) by the stopper rod system of industrial television and computer controlled automatic, make by the molten iron after the wriggling of alloy wire and pour into sand mold, obtain the discharge manifold foundry goods after unpacking through cooling off.
Embodiment 2
Present embodiment adopts the interior injection feeding technology of groove at DISA mo(u)lding line high-speed molding, and stably produces the heat-resisting vermicular cast iron discharge manifold of the car product that high quality requires under the condition of press pouring furnace automatic casting molten iron.Concrete manufacturing technology steps is as follows:
1) pig iron, steel scrap, foundry returns and iron alloy are prepared burden by following weight composition as metal charge:
C 3.0％
Si 3.9％
Mn 0.1％
P 0.02％
S 0.01％
Ti 0.10％
Mo 0.4％
Ni 0.20％
Fe all the other
And adding the induction furnace fusing, 1510 ℃ of the molten iron temperatures of coming out of the stove are as the base iron before the wriggling processing.
2) base iron that will meet above requirement is quantitatively poured 1.5 tons of hot metal ladle into, is transported to the air pressure insulated pouring stove place of 5 tons of capacity by rotating fork truck, after manually skimming, pours in this air pressure insulated pouring stove.
3) the vertical extrusion moduling automation line of enlightening sand (DISA) is made the discharge manifold sand mold continuously and is pushed under the press pouring furnace with the speed of 230 types per hour.
4) molten iron in the air pressure insulated pouring stove is depressed into the stopper rod hole of also passing through the pouring basin end in the pouring basin by automatic air pressure control, pours into sand mold.
5) after molten iron is pressed into pouring basin, the chemical combination gold thread of will wriggling is sent into wriggling processing in the pouring basin molten iron by feeding wire machine with 3 meters/minute speed.The described chemical combination gold thread of wriggling is by covering machine the 3# alloy of wriggling to be bundled into the alloy claded wire that diameter is 9mm by 0.25 * 41.5mm steel band, and comprising the 3# alloy amount of wriggling in every meter alloy wire is 140 grams, and the described 3# alloy weight composition of wriggling is:
Mg 5.5％
Si 44％
Ca 1％
Al 1％
Re 0.6％
Fe all the other
Granularity is 0.5mm.
Rationally adjust wire-feeding velocity by the productive temp of DISA mo(u)lding line when 6) pouring into a mould, and regularly skim, regularly detect wriggling of molten iron situation by quick metallurgical analysis.
7) by the stopper rod system of industrial television and computer controlled automatic, make by the molten iron after the wriggling of alloy wire and pour into sand mold, obtain the discharge manifold foundry goods after unpacking through cooling off.
Embodiment 3
Present embodiment adopts the interior injection feeding technology of groove at DISA mo(u)lding line high-speed molding, and stably produces the heat-resisting vermicular cast iron discharge manifold of the car product that high quality requires under the condition of press pouring furnace automatic casting molten iron.Concrete manufacturing technology steps is as follows:
1) pig iron, steel scrap, foundry returns and iron alloy are prepared burden by following weight composition as metal charge:
C 3.3％
Si 4.1％
Mn 0.2％
P 0.05％
S 0.02％
Ti 0.15％
Mo 0.6％
Ni 0.40％
Fe all the other
And adding the induction furnace fusing, 1530 ° ℃ of the molten iron temperatures of coming out of the stove are as the base iron before the wriggling processing.
2) base iron that will meet above requirement is quantitatively poured 1.5 tons of hot metal ladle into, is transported to the air pressure insulated pouring stove place of 5 tons of capacity by rotating fork truck, after manually skimming, pours in this air pressure insulated pouring stove.
3) the vertical extrusion moduling automation line of enlightening sand (DISA) is made the discharge manifold sand mold continuously and is pushed under the press pouring furnace with the speed of 250 model per hour.
4) molten iron in the air pressure insulated pouring stove is depressed into the stopper rod hole of also passing through the pouring basin end in the pouring basin by automatic air pressure control, pours into sand mold.
5) after molten iron is pressed into pouring basin, the chemical combination gold thread of will wriggling is sent into wriggling processing in the pouring basin molten iron by feeding wire machine with 3～4 meters/minute speed.The described chemical combination gold thread of wriggling is by covering machine the 3# alloy of wriggling to be bundled into the alloy claded wire that diameter is 9mm by 0.25 * 41.5mm steel band, and comprising the 3# alloy amount of wriggling in every meter alloy wire is 145 grams, and the described 3# alloy weight composition of wriggling is:
Mg 6.0％
Si 46％
Ca 1.5％
Al 1.1％
Re 0.8％
Fe all the other
Granularity is 1mm.
Rationally adjust wire-feeding velocity by the productive temp of DISA mo(u)lding line when 6) pouring into a mould, and regularly skim, regularly detect wriggling of molten iron situation by quick metallurgical analysis.
7) by the stopper rod system of industrial television and computer controlled automatic, make by the molten iron after the wriggling of alloy wire and pour into sand mold, obtain the discharge manifold foundry goods after unpacking through cooling off.
Claims (2)
1. the manufacture method of a heat-resisting vermicular cast iron discharge manifold is characterized in that, comprises following processing step:
1) pig iron, steel scrap, foundry returns and iron alloy are prepared burden by following weight composition as metal charge:
C 3.0～3.6％
Si 3.9～4.3％
Mn ≤0.3％
P ≤0.07％
S ≤0.02％
Ti ≤0.20％
Mo 0.4～0.7％
Ni ≤0.60％
Fe all the other
And adding the induction furnace fusing, 1510 °～1560 ℃ of the molten iron temperatures of coming out of the stove are as the base iron before the wriggling processing;
2) base iron that will meet above requirement is quantitatively poured 1.5 tons of hot metal ladle into, is transported to the air pressure insulated pouring stove place of 5 tons of capacity by rotating fork truck, after manually skimming, pours in this air pressure insulated pouring stove;
3) vertical extrusion moduling automation line is made the discharge manifold sand mold continuously and they is pushed under the press pouring furnace with the speed of 230～280 types per hour;
4) molten iron in the air pressure insulated pouring stove is depressed into the stopper rod hole of also passing through the pouring basin end in the pouring basin by automatic air pressure control, pours into sand mold;
5) after molten iron is pressed into pouring basin, the chemical combination gold thread of will wriggling is sent into wriggling processing in the pouring basin molten iron by feeding wire machine with 3～4 meters/minute speed;
Rationally adjust wire-feeding velocity by the productive temp of vertical extrusion moduling automation line when 6) pouring into a mould, and regularly skim, regularly detect wriggling of molten iron situation by quick metallurgical analysis;
7) by the stopper rod system of industrial television and computer controlled automatic, make by the molten iron after the wriggling of alloy wire and pour into sand mold, obtain the discharge manifold foundry goods after unpacking through cooling off.
2. the manufacture method of heat-resisting vermicular cast iron discharge manifold according to claim 1, it is characterized in that, the described chemical combination gold thread of wriggling is by covering machine the 3# alloy of wriggling to be bundled into the alloy claded wire that diameter is 9mm by 0.25 * 41.5mm steel band, comprising the 3# alloy amount of wriggling in every meter alloy wire is 140～150 grams, and the described 3# alloy weight composition of wriggling is:
Mg 5.5～6.5％
Si 44～48％
Ca 1～2％
Al 1～1.2％
Re 0.6～1.0％
Fe all the other
Granularity is 0.5～1.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001257609A CN1144890C (en) | 2000-10-24 | 2000-10-24 | Manufacture of heat-resistant discharge manifold of compacted graphite cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001257609A CN1144890C (en) | 2000-10-24 | 2000-10-24 | Manufacture of heat-resistant discharge manifold of compacted graphite cast iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1350068A CN1350068A (en) | 2002-05-22 |
| CN1144890C true CN1144890C (en) | 2004-04-07 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001257609A Expired - Fee Related CN1144890C (en) | 2000-10-24 | 2000-10-24 | Manufacture of heat-resistant discharge manifold of compacted graphite cast iron |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102002627B (en) * | 2010-12-08 | 2012-05-30 | 山西汤荣机械制造股份有限公司 | Method for producing vermicular cast iron brake drum |
| CN102851574B (en) * | 2012-09-24 | 2014-07-23 | 苏州东海玻璃模具有限公司 | Heatproof alloy vermicular cast iron and method for preparing same |
| CN103014232B (en) * | 2013-01-09 | 2016-01-06 | 潍柴动力股份有限公司 | A kind of injection feeding technology produces the preparation method of vermicular cast iron cored-wire and a kind of vermicular cast iron |
| CN104178686B (en) * | 2014-08-29 | 2016-08-24 | 青岛海之冠汽车配件制造有限公司 | High-temperature-resistant and anti-corrosion cast-iron alloy and preparation technology thereof |
| CN105039837B (en) * | 2015-07-13 | 2017-05-10 | 苏州东海玻璃模具有限公司 | Micro-alloying high-oxidation-resistance gray iron and preparation method thereof |
| CN105385935B (en) * | 2015-11-28 | 2017-11-03 | 西峡县西泵特种铸造有限公司 | A kind of high silicon molybdenum vermicular cast iron and its production method |
| CN105950814A (en) * | 2016-07-05 | 2016-09-21 | 潍柴动力股份有限公司 | Production method for high-strength high-elongation spheroidal graphite cast iron |
| CN111139396B (en) * | 2019-12-23 | 2021-06-01 | 山东时风（集团）有限责任公司 | Intelligent preparation method of vermicular cast iron brake drum |
| CN110982977B (en) * | 2019-12-23 | 2021-12-07 | 山东时风（集团）有限责任公司 | Preparation method of vermicular graphite cast iron automobile exhaust manifold |
| CN111850385B (en) * | 2020-07-21 | 2021-10-26 | 西峡县众德汽车部件有限公司 | Silicon-molybdenum turbocharger shell and preparation method thereof |
-
2000
- 2000-10-24 CN CNB001257609A patent/CN1144890C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1350068A (en) | 2002-05-22 |
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Granted publication date: 20040407 Termination date: 20091124 |