CN102069695A - Method for casting rear spring bracket of austenite ductile iron - Google Patents
Method for casting rear spring bracket of austenite ductile iron Download PDFInfo
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- CN102069695A CN102069695A CN 201110027990 CN201110027990A CN102069695A CN 102069695 A CN102069695 A CN 102069695A CN 201110027990 CN201110027990 CN 201110027990 CN 201110027990 A CN201110027990 A CN 201110027990A CN 102069695 A CN102069695 A CN 102069695A
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Abstract
The invention discloses a method for casting a rear spring bracket of an austenite ductile iron. The method comprises the following steps: injecting a mold, making a shell, dewaxing, roasting, smelting and pouring, cleaning sand, machining, carrying out heat treatment, machining and storing, wherein the smelting step comprises controlling furnace burden, matching and smelting, spheroidizing and inoculating, wherein 75% silicon iron is used as inoculant in the inoculating process and the inoculant accounts for 1.25%-1.3% in percentage by mass in the main materials; in the process of melted iron pouring, a sprue cup is always kept to be filled with melted iron, and the pouring temperature is controlled at 1460-1530 DEG C; and the rear spring bracket casting of the austenite ductile iron is heated up to 900-1000 DEG C for 1.5-2 hours, and the casting is placed in a salt bath furnace at a temperature of 360-370 DEG C for 1-1.5 hours before the casting is finally tapped off. The rear spring bracket of the austenite ductile iron manufactured by the method has high thermal shock resistance and wear resistance, excellent corrosion resistance, high-temperature oxidation resistance, low thermal expansion and excellent low temperature impact toughness.
Description
Technical field
The invention belongs to flat spring bracket processing technique field behind the automobile, be specifically related to behind a kind of austenite ductile cast iron flat spring bracket with the casting method of finish cast die shell cast.
Background technology
Austenite ductile cast iron is that the 1925-1930 U.S. at first succeeds in developing, but up to the sixties this material also rarely known by the people.The production application of this cast iron constantly develops after 1970, has listed western developed country and International Standardization Organization in.Austenite ductile cast iron is a kind of rising material, and it has good comprehensive mechanical performance and shop characteristic, at aspects such as plasticity, against corrosion, anti-oxidant, heat-resisting, cracking resistance, vibration dampings, is that other materials is incomparable.In the last few years, development along with automotive engineering, nuclear power and ocean engineering, be widely used in abroad making that sea water pump, valve, blwr housing, freeing pipe, valve seat etc. are heat-resisting, during the resistant to corrosion parts make, the demand to austenite ductile cast iron on the world market is increasing.
In order to adapt to developing of automobile industry and various countries, will become the main flow that automobile is used for iron with ball to product more and more higher requirement in service life.Along with the development of auto-industry technology, the modified steel casting of the carburizing of Shi Yonging can not meet the demands in the past, and austenite ductile cast iron has better wear-resisting, corrosion stability to obtain widespread use on top-of-the-range version because of having than the modified steel casting of carburizing.But, since this kind castings material complexity, smelting and pouring temperature height, casting manufacturability is poor, the coarse requirement of cast(ing) surface is high, and austenite ductile cast iron can't use existing foundry technique to make.
Summary of the invention
The object of the invention provides behind a kind of austenite ductile cast iron flat spring bracket with the casting method of finish cast die shell cast, flat spring bracket has strong thermal-shock resistance and resistance to abrasion behind the austenite ductile cast iron of producing by this technology, good corrosion stability and high-temperature oxidation resistance, and low thermal expansivity and good low-temperature impact toughness are arranged.
For achieving the above object, foundry technique step of the present invention is: injection molding → system shell → dewaxing → roasting → melting, cast → sand removal, cleaning → machinework → heat treatment, Shot Blasting → machinework → finished product warehouse-in,
Wherein mainly improving processing step is:
1, melting:
The melting of austenite ductile cast iron
A, furnace charge and proportioning
With pig iron 60-70%, foundry returns 25-30% and steel scrap 5-15% is major ingredient, auxiliary furnace charge Cu 0.5%, molybdenum-iron 0.22%, the nodulizing agent 1.3-1.35% that contains magnesium 6.42%Re2.4%, inoculator are 75% ferrosilicon 1.25-1.3%, and above-mentioned charge composition is percent by weight;
B, melting control
With the pig iron, foundry returns and steel scrap is major ingredient, when the pig iron, foundry returns, steel scrap and auxiliary furnace charge Cu are put into electric furnace crucible melting to molten iron and reach 1450 ℃-1550 ℃, adds molybdenum-iron; The austenite ductile cast iron tapping temperature is 1600 ℃-1680 ℃;
C, spherodization
The spherodization of austenite ductile cast iron adopts easy pit to pour method, and nodulizing agent is selected the nodularization alloy that contains magnesium 6.42%Re2.4% for use, and it is 1.3-1.35% that the addition of nodulizing agent accounts for the major ingredient percent by weight;
D, inoculated
The ferrosilicon of employing 75% is an inoculator, and accounting for the major ingredient percent by weight is 1.25-1.3%;
E, cast
In molten steel pouring course, keep molten iron to be full of pouring basin all the time, pouring temperature is controlled at 1460 ℃-1530 ℃;
2, heat treatment
Flat spring bracket foundry goods behind the austenite ductile cast iron is warming up to 900 ℃-1000 ℃, is incubated 1.5-2 hour, insulation was come out of the stove in 1-1.5 hour in the salt bath furnace that is placed on 360 ℃-370 ℃ of coming out of the stove.
Adopt above-mentioned foundry technique: as in furnace charge and proportioning process and melting control technology, the content of trace harmful elements P, S in the control furnace charge, content and adding mode and the sequencing of control important element C, Mo, Si, and control melts out furnace temperature, reduce the scaling loss of carbon, molybdenum, manganese alloy, effectively guaranteed to form austenite ductile cast iron elemental composition and percent by weight; Nodulizing agent is selected the magnesium-rare earth nodulizing agent for use, and inoculator adopts the 75Si% ferrosilicon, by breeding the increase number of graphite ball; Foundry goods is through bakingout process, and carbide metal is transformed into needle-like by strip and block in the tissue, has improved the thermal-shock resistance and the resistance to abrasion of foundry goods.Flat spring bracket behind the austenite ductile cast iron of producing by above-mentioned foundry technique efficiently solves the problem that existing foundry technique can't guarantee.The matrix of the back flat spring bracket that casts out is mainly the residual austenite of medium or tiny needle-like upper bainite+20-30%, flat spring bracket ambient temperature mechanical properties height not only behind this austenite ductile cast iron, fabulous thermal-shock resistance and resistance to abrasion are arranged, fabulous corrosion stability and high-temperature oxidation resistance, and low thermal expansivity and good low-temperature impact toughness are arranged.Performance can satisfy existing U.S. ASTM standard and Europe IV standard.
Its parameter such as following table:
Table 1 mechanical property (foundry goods body sampling)
| Tensile strength/Mpa | Yield strength/Mpa | Percentage elongation (%) | Hardness (10/3000HB) |
| ≥1000 | ≥700 | ≥4 | 300-360 |
Table 2 metallographic structure (foundry goods body sampling)
Table 3 chemical analysis
| Element | Percent by weight (%) | Element | Percent by weight (%) |
| C | 3.6-3.9 | P | ≤0.08 |
| Si | 2.3-3.2 | S | ≤0.03 |
| Mg | 0.035-0.09 | RE | ≤0.04 |
| Cu | 0.6-1.0 | Other element | ≤0.2 |
| Mn | 0.1-0.5 | Total impurities | ≤2.0 |
| Fe | Surplus |
Below specific embodiments of the invention are described in further detail.
The specific embodiment
The casting method of flat spring bracket behind the austenite ductile cast iron of the present invention is by following processing step preparation: injection molding → system shell → dewaxing → roasting → melting, cast (check) → sand removal, cleaning (check) → machinework (milling face, boring) (check) → heat treatment (check), Shot Blasting → machinework (tapping) (check) → finished product warehouse-in.
Wherein injection molding, system shell, dewaxing, roasting, sand removal, cleaning, machinework (milling face, boring), Shot Blasting, machinework (tapping) (check), finished product warehouse-in are manufactured according to the back flat spring bracket manufacturing process of routine.
Wherein mainly improving technology is:
1, melting:
The melting of austenite ductile cast iron
A, furnace charge and proportioning
With the pig iron (as QT10 or QT12) 60%, foundry returns 25% and steel scrap 15% is major ingredient, auxiliary furnace charge Cu 0.5%, molybdenum-iron 0.22%, the nodulizing agent 1.3% that contains magnesium 6.42%Re2.4%, inoculator are 75% ferrosilicon 1.25%, and above-mentioned charge composition is percent by weight;
Charge composition can add in following ratio: with the pig iron (as QT10 or QT12) 70%, foundry returns 25% and steel scrap 5% is major ingredient, auxiliary furnace charge Cu 0.5%, molybdenum-iron 0.22%, the nodulizing agent 1.35% that contains magnesium 6.42%Re2.4%, inoculator are 75% ferrosilicon 1.3%, and above-mentioned charge composition is percent by weight;
B, melting control
With the pig iron, foundry returns and steel scrap is major ingredient, when the pig iron, foundry returns, steel scrap and auxiliary furnace charge Cu are put into electric furnace crucible melting to molten iron and reach 1450 ℃-1550 ℃, adds molybdenum-iron; The austenite ductile cast iron tapping temperature is 1600 ℃-1680 ℃;
C, spherodization
The spherodization of austenite ductile cast iron adopts easy pit to pour method, and nodulizing agent is selected the nodularization alloy that contains magnesium 6.42%Re2.4% for use, and it is 1.3-1.35% that the addition of nodulizing agent accounts for the major ingredient percent by weight;
D, inoculated
Adopting the ferrosilicon of 75Si% is inoculator, and accounting for the major ingredient percent by weight is 1.25-1.3%;
E, cast
In molten steel pouring course, keep molten iron to be full of pouring basin all the time, pouring temperature is controlled at 1460 ℃-1530 ℃.
2, heat treatment
Flat spring bracket foundry goods behind the austenite ductile cast iron is warming up to 900 ℃-1000 ℃, is incubated 1.5-2 hour, insulation was come out of the stove in 1-1.5 hour in the salt bath furnace that is placed on 360 ℃-370 ℃ of coming out of the stove.
Silicon: because the requirement of resistance to heat, fixed very high of silicon content in the product, Si adds with 75% ferrosilicon form, and addition accounts for major ingredient percent by weight 1.1-1.35%, the scope of preferred 1.25-1.3%, the flowing power of spheroidal graphite iron is also better in this scope;
Molybdenum: molybdenum is the fundamental element of austenite ductile cast iron;
Manganese: manganese is the element of generally selecting for use, owing to stipulate in the technical standard, generally lower limit can be avoided generating sclerotic tissue because of the segregation of Mn;
Phosphorus: phosphorus solubility in austenite is extremely low, and generally the form with iron phosphide eutectic is present in crystal boundary, degrade performance, then P＜0.05;
Sulphur: sulphur is a kind of impurity in austenite ductile cast iron, requires base iron S≤0.02%.
Wherein melting control: adopt medium-frequency induction furnace to carry out melting, according to pig iron content batching, molybdenum added in the melting later stage; The spheroidal graphite iron tapping temperature is 1600 ℃-1680 ℃.
Spherodization: the spherodization of spheroidal graphite iron adopts easy pit to pour method.Nodulizing agent is selected the nodularization alloy that contains magnesium 6.42%Re2.4% for use, and it is 1.3-1.35% that the addition of nodulizing agent accounts for the major ingredient percent by weight;
Inoculated: adopting the ferrosilicon of 75Si% is inoculator, and accounting for the major ingredient percent by weight is 1.25-1.3%; By breeding the globular graphite structure that can obtain rule, can eliminate spoken parts in traditional operas, increase number of graphite ball.
Iron liquid after the melting is poured into a mould, because the molten ductile cast iron flowing power is very fast with cavity filling process decline, should pours into a mould fast and fill type, helps feeding, and pouring temperature is controlled at 1460 ℃-1530 ℃.
The flat spring bracket foundry goods has mechanical property and higher hardness preferably behind the austenite ductile cast iron, by it is heat-treated, flat spring bracket foundry goods behind the austenite ductile cast iron is warming up to 900 ℃-1000 ℃, be incubated 1.5-2 hour, insulation was come out of the stove in 1-1.5 hour in the salt bath furnace that is placed on 360 ℃-370 ℃ of coming out of the stove.
Foundry goods is through bakingout process, carbide metal is transformed into needle-like by strip and block in the tissue, matrix is mainly the residual austenite of medium or tiny needle-like upper bainite+20-30%, flat spring bracket ambient temperature mechanical properties height not only behind this austenite ductile cast iron, fabulous thermal-shock resistance and resistance to abrasion are arranged, fabulous corrosion stability and high-temperature oxidation resistance, and low thermal expansivity and good low-temperature impact toughness are arranged.Performance can satisfy existing U.S. ASTM standard and Europe IV standard.
Claims (1)
1. the casting method of flat spring bracket behind the austenite ductile cast iron, it is characterized in that by following processing step preparation: injection molding → system shell → dewaxing → roasting → melting, cast → sand removal, cleaning → machinework → heat treatment, Shot Blasting → machinework → finished product warehouse-in
Wherein mainly improving processing step is:
(1), melting:
The melting of austenite ductile cast iron
A, furnace charge and proportioning
With pig iron 60-70%, foundry returns 25-30% and steel scrap 5-15% is major ingredient, auxiliary furnace charge Cu0.5%, molybdenum-iron 0.22%, the nodulizing agent 1.3-1.35% that contains magnesium 6.42%Re2.4%, inoculator are 75% ferrosilicon 1.25-1.3%, and above-mentioned charge composition is percent by weight;
B, melting control
With the pig iron, foundry returns and steel scrap is major ingredient, when the pig iron, foundry returns, steel scrap and auxiliary furnace charge Cu are put into electric furnace crucible melting to molten iron and reach 1450 ℃-1550 ℃, adds molybdenum-iron; The austenite ductile cast iron tapping temperature is 1600 ℃-1680 ℃;
C, spherodization
The spherodization of austenite ductile cast iron adopts easy pit to pour method, and nodulizing agent is selected the nodularization alloy that contains magnesium 6.42%Re2.4% for use, and it is 1.3-1.35% that the addition of nodulizing agent accounts for the major ingredient percent by weight;
D, inoculated
The ferrosilicon of employing 75% is an inoculator, and accounting for the major ingredient percent by weight is 1.25-1.3%;
E, cast
In molten steel pouring course, keep molten iron to be full of pouring basin all the time, pouring temperature is controlled at 1460 ℃-1530 ℃;
(2), heat treatment
Flat spring bracket foundry goods behind the austenite ductile cast iron is warming up to 900 ℃-1000 ℃, is incubated 1.5-2 hour, insulation was come out of the stove in 1-1.5 hour in the salt bath furnace that is placed on 360 ℃-370 ℃ of coming out of the stove.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102634647A (en) * | 2012-05-11 | 2012-08-15 | 四川城际轨道交通材料有限责任公司 | Low-temperature (minus 60 DEG C) toughness improvement method of nodular cast iron |
| CN102644017A (en) * | 2012-04-27 | 2012-08-22 | 福建省铁城精密铸造有限公司 | Dewaxing casting process for nodular iron castings |
| CN103205624A (en) * | 2013-04-16 | 2013-07-17 | 常熟建华模具科技股份有限公司 | Graphite cast iron glass mould of ferritic matrix and manufacturing method of mould |
| CN103785794A (en) * | 2012-10-26 | 2014-05-14 | 陕西重型汽车有限公司 | Heavy truck leaf spring bracket mold plate assembly |
| CN104032204A (en) * | 2013-03-08 | 2014-09-10 | Lg电子株式会社 | Rotor of vane pump and method of manufacturing rotor |
| CN104985130A (en) * | 2015-05-27 | 2015-10-21 | 含山县恒翔机械制造有限公司 | Preparation method of advertising lamp bracket at top of taxi |
| CN107252876A (en) * | 2017-06-28 | 2017-10-17 | 安徽华飞机械铸锻有限公司 | A kind of casting method of sternpost |
| CN109434036A (en) * | 2018-11-05 | 2019-03-08 | 浙江南钢铸业有限公司 | A kind of valve sand mo(u)ld casting process |
| CN109576562A (en) * | 2019-02-15 | 2019-04-05 | 莱州鸿源台钳制造有限公司 | A kind of preparation method of trace chromium austempered ductile iron automotive suspension bracket |
| CN112387978A (en) * | 2020-10-21 | 2021-02-23 | 西安斯瑞先进铜合金科技有限公司 | Preparation method of CuFe alloy powder for brake pad |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644017A (en) * | 2012-04-27 | 2012-08-22 | 福建省铁城精密铸造有限公司 | Dewaxing casting process for nodular iron castings |
| CN102634647A (en) * | 2012-05-11 | 2012-08-15 | 四川城际轨道交通材料有限责任公司 | Low-temperature (minus 60 DEG C) toughness improvement method of nodular cast iron |
| CN103785794A (en) * | 2012-10-26 | 2014-05-14 | 陕西重型汽车有限公司 | Heavy truck leaf spring bracket mold plate assembly |
| CN104032204A (en) * | 2013-03-08 | 2014-09-10 | Lg电子株式会社 | Rotor of vane pump and method of manufacturing rotor |
| CN103205624A (en) * | 2013-04-16 | 2013-07-17 | 常熟建华模具科技股份有限公司 | Graphite cast iron glass mould of ferritic matrix and manufacturing method of mould |
| CN104985130A (en) * | 2015-05-27 | 2015-10-21 | 含山县恒翔机械制造有限公司 | Preparation method of advertising lamp bracket at top of taxi |
| CN107252876A (en) * | 2017-06-28 | 2017-10-17 | 安徽华飞机械铸锻有限公司 | A kind of casting method of sternpost |
| CN109434036A (en) * | 2018-11-05 | 2019-03-08 | 浙江南钢铸业有限公司 | A kind of valve sand mo(u)ld casting process |
| CN109576562A (en) * | 2019-02-15 | 2019-04-05 | 莱州鸿源台钳制造有限公司 | A kind of preparation method of trace chromium austempered ductile iron automotive suspension bracket |
| CN109576562B (en) * | 2019-02-15 | 2020-07-21 | 莱州鸿源台钳制造有限公司 | Preparation method of trace chromium austempered ductile iron automobile suspension bracket |
| CN112387978A (en) * | 2020-10-21 | 2021-02-23 | 西安斯瑞先进铜合金科技有限公司 | Preparation method of CuFe alloy powder for brake pad |
| CN112387978B (en) * | 2020-10-21 | 2023-03-14 | 西安斯瑞先进铜合金科技有限公司 | Preparation method of CuFe alloy powder for brake pad |
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Application publication date: 20110525 |