CN106048403A - Antifatigue nodular iron casting for car camshaft and preparation method of antifatigue nodular iron casting - Google Patents
Antifatigue nodular iron casting for car camshaft and preparation method of antifatigue nodular iron casting Download PDFInfo
- Publication number
- CN106048403A CN106048403A CN201610681020.9A CN201610681020A CN106048403A CN 106048403 A CN106048403 A CN 106048403A CN 201610681020 A CN201610681020 A CN 201610681020A CN 106048403 A CN106048403 A CN 106048403A
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- CN
- China
- Prior art keywords
- iron casting
- ferrum liquid
- antifatigue
- nodular iron
- bag
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Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D5/00—Heat treatments of cast-iron
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/30—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for crankshafts; for camshafts
-
- 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
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses an antifatigue nodular iron casting for a car camshaft and a preparation method of the antifatigue nodular iron casting. The nodular iron casting is prepared from, by weight percent, 3.8%-4.1% of C, 2.4%-2.7% of Si, 0.5%-0.9% of Mn, 0.4%-0.8% of Ni, 0.3%-0.6% of Mo, 0.2%-0.4% of Ti, 0.15%-0.3% of Ge, 0.1%-0.2% of Y, 0.05%-0.1% of Ho, not larger than 0.06% of P, not larger than 0.04% of S and the balance Fe. The chemical ingredients of an alloy are optimized, Ni, Ti, Ge and other elements are added, and therefore the strength, toughness and antifatigue capacity of the nodular iron casting can be remarkably improved; and Mo, Y, Ho and other elements are added, grains can be refined, and therefore the material has high resistance to hot fatigue crack initiation and expansion. The antifatigue nodular iron casting for the car camshaft has high mechanical strength and good toughness and further has excellent antifatigue performance.
Description
Technical field
The present invention relates to a kind of automobile camshaft resisting fatigue nodular iron casting and preparation method thereof, belong to spheroidal graphite cast-iron skill
Art field.
Background technology
The birth of automobile has had the history of a century, quickly grows, has the most become the most topmost vehicles
With the important driving force spurred economic growth, also it is that people live indispensable important component part.Foundry goods is automobile product
One of important composition of parts, cast product application on auto parts and components occupies critical role.The master of automotive castings
Want feature be complex-shaped, wall thickness is relatively thin, dimensional accuracy is high, production lot is big, require that reliability is the most high.Automobile will to the greatest extent may be used
Low can alleviate own wt, it is desirable to foundry goods should be light, also to have the highest intensity.The material of past many auto parts and components
It is casting pig, the most mostly changes nodular iron casting into.
Camshaft is a critical component in automobile engine, and its effect is to control the unlatching of valve and close dynamic
Make.Although the rotating speed of camshaft is the half (rotating speed at two stroke engine convexity wheel shaft of bent axle in four-stroke engine
Identical with bent axle), but generally its rotating speed is the highest, and need to bear the biggest moment of torsion, it is therefore desirable to for automobile
The nodular iron casting of camshaft has the anti-fatigue performance of excellence.
Summary of the invention
It is an object of the invention to provide a kind of automobile camshaft resisting fatigue nodular iron casting and preparation method thereof.
For achieving the above object, the present invention adopts the following technical scheme that
A kind of automobile camshaft resisting fatigue nodular iron casting, the percentage by weight of its each chemical constituent is: C 3.8-4.1%, Si
2.4-2.7%、Mn 0.5-0.9%、Ni 0.4-0.8%、Mo 0.3-0.6%、Ti 0.2-0.4%、Ge 0.15-0.3%、Y 0.1-
0.2%, Ho 0.05-0.1%, P≤0.06%, S≤0.04%, surplus is Fe.
The preparation method of a kind of automobile camshaft resisting fatigue nodular iron casting, comprises the following steps:
(1) weigh the furnace charges such as the pig iron, steel scrap, foundry returns, molybdenum-iron, ferromanganese, ferronickel to join medium-frequency induction furnace carries out melting,
Smelting temperature is 1480-1500 DEG C, and after furnace charge all melts, sample analysis also adjusts ferrum liquid composition, heats up after reaching requirement
To 1540-1570 DEG C, being 250-350W at power, rotating speed is magnetic agitation 12-16min under conditions of 800-1200r/min, quiet
Put 20-30min, come out of the stove；
(2), before ferrum liquid is come out of the stove, first add in the base wells on bag dam, nodularization bag side and be equivalent to ferrum liquid quality 1.0-1.5%
Rare earth barium calcium and magnesium ferrosilicon nodulizer, covers the silicon titanate innoculant being equivalent to ferrum liquid quality 0.4-0.7% on nodulizer, then exists
Inovulant surface uniformly spreads that last layer is clean, be dried, rustless magnesium iron is considered to be worth doing and consolidated, and when ferrum liquid is come out of the stove, is wrapped by lid by ferrum liquid
Aperture carries out nodularization and inoculation in flowing into nodularization bag, and temperature controls at 1490-1530 DEG C, after treating spheroidizing reacion, vertical
I.e. spreading collection swelling perlite powder on ferrum liquid surface, be 400-500W at power, frequency is ultrasonic vibration under conditions of 20-30kHz
35-45mim, and scratch clean the scum silica frost on ferrum liquid surface, stand 15-20min, then chill block analysis is produced in sampling, detects nodularization
Can pour into a mould after qualified；
(3) before cast, nodularization bag and bag being baked to 800-850 DEG C, pouring temperature controls at 1450-1480 DEG C, cast speed
Degree controls at 0.3-0.5kg/s；
(4) foundry goods to moulding by casting carries out heat treatment: first with the ramp of 80-100 DEG C/h to 940-980 DEG C, be incubated 2-
3h, then it is cooled to 490-530 DEG C with the speed of 30-50 DEG C/h, it is incubated 4-5h；Then put in 80-120 DEG C of warm oil to cool down and quench
Fire, cools down 15-30s；Last microwave heating 4-6h under conditions of power is 250-350W, then be the bar of 800-900W at power
Microwave heating 1-3h under part, air cooling of coming out of the stove.
Beneficial effects of the present invention:
The present invention chemical composition by optimized alloy, the addition of the elements such as Ni, Ti, Ge can significantly improve the strong of spheroidal graphite cast-iron
Degree, toughness and anti-fatigue ability, the addition of the elements such as Mo, Y, Ho can make crystal grain refine so that heat fatigue cracking is sprouted by material
Raw and extension has the strongest drag.Automobile camshaft nodular iron casting of the present invention not only has higher mechanical strength and relatively
Good toughness, also has the anti-fatigue performance of excellence.
Detailed description of the invention
A kind of automobile camshaft resisting fatigue nodular iron casting, the percentage by weight of its each chemical constituent is: C 3.8-
4.1%、Si 2.4-2.7%、Mn 0.5-0.9%、Ni 0.4-0.8%、Mo 0.3-0.6%、Ti 0.2-0.4%、Ge 0.15-
0.3%, Y 0.1-0.2%, Ho 0.05-0.1%, P≤0.06%, S≤0.04%, surplus is Fe.
The preparation method of a kind of automobile camshaft resisting fatigue nodular iron casting, comprises the following steps:
(1) weigh the furnace charges such as the pig iron, steel scrap, foundry returns, molybdenum-iron, ferromanganese, ferronickel to join medium-frequency induction furnace carries out melting,
Smelting temperature is 1490 DEG C, and after furnace charge all melts, sample analysis also adjusts ferrum liquid composition, is warming up to 1550 after reaching requirement
DEG C, it is 300W at power, rotating speed is magnetic agitation 14min under conditions of 1000r/min, stands 25min, comes out of the stove；
(2), before ferrum liquid is come out of the stove, in the base wells on bag dam, nodularization bag side, the rare earth being equivalent to ferrum liquid quality 1.2% is first added
Barium calcium and magnesium ferrosilicon nodulizer, covers the silicon titanate innoculant being equivalent to ferrum liquid quality 0.5%, then at inovulant table on nodulizer
Face uniformly spreads that last layer is clean, be dried, rustless magnesium iron consider and consolidated, when ferrum liquid is come out of the stove, by ferrum liquid by the inflow of lid bag aperture
Carrying out nodularization and inoculation in nodularization bag, temperature controls at 1510 DEG C, after treating spheroidizing reacion, spreads on ferrum liquid surface immediately
Collection swelling perlite powder, is 450W at power, and frequency is ultrasonic vibration 40mim under conditions of 25kHz, and scratches clean ferrum liquid surface
Scum silica frost, stands 18min, and then chill block analysis is produced in sampling, can pour into a mould after detection nodularization is qualified；
(3) before cast, nodularization bag and bag being baked to 820 DEG C, pouring temperature controls at 1465 DEG C, and poring rate controls
0.4kg/s；
(4) foundry goods to moulding by casting carries out heat treatment: first with the ramp of 90 DEG C/h to 960 DEG C, be incubated 2.5h, then with 40
DEG C/speed of h lowers the temperature 510 DEG C, is incubated 4h；Then put into Cooling Quenching in 100 DEG C of warm oil, cool down 25s；At power it is finally
Microwave heating 5h under conditions of 300W, then microwave heating 2h under conditions of power is 850W, air cooling of coming out of the stove.
Through inspection, its mechanical property is: tensile strength 791Mpa, yield strength 654Mpa, percentage elongation 12.6%, tired strong
Degree 412Mpa.
Claims (2)
1. an automobile camshaft resisting fatigue nodular iron casting, it is characterised in that the percentage by weight of its each chemical constituent is:
C 3.8-4.1%、Si 2.4-2.7%、Mn 0.5-0.9%、Ni 0.4-0.8%、Mo 0.3-0.6%、Ti 0.2-0.4%、Ge
0.15-0.3%, Y 0.1-0.2%, Ho 0.05-0.1%, P≤0.06%, S≤0.04%, surplus is Fe.
2. the preparation method of an automobile camshaft resisting fatigue nodular iron casting as claimed in claim 1, it is characterised in that
Comprise the following steps:
Weigh the furnace charges such as the pig iron, steel scrap, foundry returns, molybdenum-iron, ferromanganese, ferronickel to join medium-frequency induction furnace carries out melting, molten
Refining temperature is 1480-1500 DEG C, and after furnace charge all melts, sample analysis also adjusts ferrum liquid composition, is warming up to after reaching requirement
1540-1570 DEG C, be 250-350W at power, and rotating speed is magnetic agitation 12-16min under conditions of 800-1200r/min, stands
20-30min, comes out of the stove；
Before ferrum liquid is come out of the stove, in the base wells on bag dam, nodularization bag side, first add the rare earth being equivalent to ferrum liquid quality 1.0-1.5%
Barium calcium and magnesium ferrosilicon nodulizer, covers the silicon titanate innoculant being equivalent to ferrum liquid quality 0.4-0.7% on nodulizer, is then breeding
Agent surface uniformly spreads that last layer is clean, be dried, rustless magnesium iron is considered to be worth doing and consolidated, when ferrum liquid is come out of the stove, by ferrum liquid by lid bag aperture
Carrying out nodularization and inoculation in flowing into nodularization bag, temperature controls, at 1490-1530 DEG C, after treating spheroidizing reacion, to exist immediately
Collection swelling perlite powder is spread on ferrum liquid surface, is 400-500W at power, and frequency is ultrasonic vibration 35-under conditions of 20-30kHz
45mim, and scratch clean the scum silica frost on ferrum liquid surface, stand 15-20min, then chill block analysis is produced in sampling, and detection nodularization is qualified
After can pour into a mould；
Before cast, nodularization bag and bag being baked to 800-850 DEG C, pouring temperature controls at 1450-1480 DEG C, poring rate control
System is at 0.3-0.5kg/s；
(4) foundry goods to moulding by casting carries out heat treatment: first with the ramp of 80-100 DEG C/h to 940-980 DEG C, be incubated 2-
3h, then it is cooled to 490-530 DEG C with the speed of 30-50 DEG C/h, it is incubated 4-5h；Then put in 80-120 DEG C of warm oil to cool down and quench
Fire, cools down 15-30s；Last microwave heating 4-6h under conditions of power is 250-350W, then be the bar of 800-900W at power
Microwave heating 1-3h under part, air cooling of coming out of the stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610681020.9A CN106048403A (en) | 2016-08-18 | 2016-08-18 | Antifatigue nodular iron casting for car camshaft and preparation method of antifatigue nodular iron casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610681020.9A CN106048403A (en) | 2016-08-18 | 2016-08-18 | Antifatigue nodular iron casting for car camshaft and preparation method of antifatigue nodular iron casting |
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| CN106048403A true CN106048403A (en) | 2016-10-26 |
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| CN201610681020.9A Pending CN106048403A (en) | 2016-08-18 | 2016-08-18 | Antifatigue nodular iron casting for car camshaft and preparation method of antifatigue nodular iron casting |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108660363A (en) * | 2018-06-06 | 2018-10-16 | 含山县东山德雨球墨铸造厂 | A kind of nodular cast iron of Wear-resistant, high-temperature resistant |
| CN108950368A (en) * | 2018-07-16 | 2018-12-07 | 佛山市高明康得球铁有限公司 | A kind of case of transmission spheroidal graphite cast-iron |
| CN108950369A (en) * | 2018-07-16 | 2018-12-07 | 佛山市高明康得球铁有限公司 | A kind of preparation method of case of transmission spheroidal graphite cast-iron |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102136A (en) * | 2011-03-07 | 2011-06-22 | 衡阳中钢衡重铸锻有限公司 | As-cast high-toughness ferrite nodular iron and production method thereof |
| CN102912214A (en) * | 2012-10-31 | 2013-02-06 | 佛山市顺德区中天创展球铁有限公司 | Ductile cast iron as well as ductile cast iron piston and casting process thereof |
| CN105483517A (en) * | 2015-12-08 | 2016-04-13 | 繁昌县恒鑫汽车零部件有限公司 | Corrosion-resistant alloy cast iron material for diesel engine cylinder and preparing method thereof |
-
2016
- 2016-08-18 CN CN201610681020.9A patent/CN106048403A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102136A (en) * | 2011-03-07 | 2011-06-22 | 衡阳中钢衡重铸锻有限公司 | As-cast high-toughness ferrite nodular iron and production method thereof |
| CN102912214A (en) * | 2012-10-31 | 2013-02-06 | 佛山市顺德区中天创展球铁有限公司 | Ductile cast iron as well as ductile cast iron piston and casting process thereof |
| CN105483517A (en) * | 2015-12-08 | 2016-04-13 | 繁昌县恒鑫汽车零部件有限公司 | Corrosion-resistant alloy cast iron material for diesel engine cylinder and preparing method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108660363A (en) * | 2018-06-06 | 2018-10-16 | 含山县东山德雨球墨铸造厂 | A kind of nodular cast iron of Wear-resistant, high-temperature resistant |
| CN108950368A (en) * | 2018-07-16 | 2018-12-07 | 佛山市高明康得球铁有限公司 | A kind of case of transmission spheroidal graphite cast-iron |
| CN108950369A (en) * | 2018-07-16 | 2018-12-07 | 佛山市高明康得球铁有限公司 | A kind of preparation method of case of transmission spheroidal graphite cast-iron |
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Application publication date: 20161026 |