CN104404363B - A kind of Automobile flywheel high-strength spheroidal graphite cast-iron and high densification cast moulding method thereof - Google Patents
A kind of Automobile flywheel high-strength spheroidal graphite cast-iron and high densification cast moulding method thereof Download PDFInfo
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- CN104404363B CN104404363B CN201410830809.7A CN201410830809A CN104404363B CN 104404363 B CN104404363 B CN 104404363B CN 201410830809 A CN201410830809 A CN 201410830809A CN 104404363 B CN104404363 B CN 104404363B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
Abstract
The present invention open a kind of Automobile flywheel high-strength spheroidal graphite cast-iron and high solid cast manufacturing process thereof, the content of pearlite in alloy of high-strength spheroidal graphite cast-iron matrix is 90%～95%, ferrite content is 5%～10%, add a small amount of Mn simultaneously, Ni, the Nb of Cr and trace carries out alloy strengthening, alloying element forms and mass percent is: C:3.2%～3.8%, Si:2.0%～2.5%, Mn:0.1%～0.5%, Ni:0.1%～1.0%, Cr:0.2%～1.0%, Nb:0.01%～0.25%, P :≤0.08%, S≤0.025%, Mg:0.02%～0.06%, Re:0.01%～0.05%, surplus is Fe.This spheroidal graphite cast-iron is more than 560MPa more than 700MPa, HB more than 280,500 DEG C of Testing Tensile Strength at Elevated Temperatures in room temperature tensile intensity.Meanwhile, the present invention arranges two flat riser necks independent of each other in hot riser, it is thus achieved that high fine and close Wheel casting, the unbalancing value of flywheel is less than 1270g cm, improves dynamic balance and safety.
Description
Technical field
The invention belongs to field of iron and steel, be specifically related to a kind of high-strength spheroidal graphite cast-iron of Automobile flywheel and high cause thereof
Densification cast moulding method.
Background technology
Along with the fast development of automobile industry, the security performance of electromotor gradually causes the attention of people.Flywheel
Being that in Diesel engine, structure is relatively easy but play energy storage and the part of driving effect, it is by storing electromotor
Energy outside expansion stroke, make toggle cross smoothly upper and lower stop with complete assist stroke, from
And reduce the velocity perturbation in engine operation process；Meanwhile, flywheel in automotive transmission the most usually
Take on the task of driving friction clutch.Therefore, the security performance of flywheel for the security performance of electromotor is
Important impact can be had to car load traveling comfort.
Spheroidal graphite cast-iron is because having high specific strength and specific stiffness, excellent damping property, and can pass through casting
Cause shape to obtain the structural member with high bearing capacity, be commonly used to make high rotating speed, high-power Diesel engine
On flywheel.Nodular cast iron flywheel as the driving part of engine friction clutch, under arms during with
Clutch friction plate high-speed friction also produces high temperature, causes tourbillon surface wear to avoid.During use,
If tourbillon surface wear amount is little and even wearing, then dynamic balance and safety effects to flywheel are less；And
Abrasion is relatively greatly or uneven wear can accelerate the damage of flywheel, in alternate stress effect produced by high speed rotating
And under the conditions of worst hot case, flywheel easily cracks, electromotor is not only made normally to start, Er Qierong
Easily cause Flywheel Disintegration, cause personal safety accident.Therefore, the elevated temperature strength of flywheel spheroidal graphite cast-iron is improved
With anti-wear performance, the general safety performance improving electromotor is particularly important.
China's research about cast iron flywheel in recent years focuses mostly in the improvement of flywheel structure, there is no lifting flywheel
The research of ductile cast iron material performance used, such as:
Chinese patent CN201763497U discloses one " gasoline engine flywheel ", and the structure of flywheel is: fly
There is the reinforcement of more than four at wheel center to edge, remaining position hollow out, and this structure saves making material,
But the freewheel body structure of hollow out is unfavorable for feeding during ductile iron solidification, proposes casting technique higher
Requirement, simultaneously without reference to the research of ductile cast iron material performance boost used by flywheel.
Chinese patent CN101270794 A discloses one " sectional flywheel of the band plastic blade of electromotor ",
The cast iron flywheel single piece of band blade is changed into plastic blade wheel and the molectron of cast iron flywheel, not only reduces
Manufacturing cost, also improves the economy of electromotor, but also without relating to ductile cast iron material used by flywheel
The research of performance boost.
Chinese patent CN202250542U discloses one " nodular cast iron flywheel for general gasoline engine ", will fly
Wheel body and the disposable casting forming of gear ring spheroidal graphite cast-iron, this monolithic construction not only overcomes gear ring and leads to
Cross heat pressing process and be assemblied in the defect that the quality of fit that causes on body reduces, and the intensity of flywheel is high,
Lightweight, safe and reliable, but also without relating to grinding of ductile cast iron material performance boost used by flywheel
Study carefully.
Flywheel under high speed rotating bears huge inertia force, only possesses good dynamic balance guarantee
Himself operates steadily in the course of the work, and this proposes the highest requirement equally to the inherent quality of foundry goods.
Therefore, the factor of decision flywheel safety is in addition to flywheel material therefor, and the quality within flywheel is to it also
Have a major impact.At present the mushy freezing mode of spheroidal graphite cast-iron and the poor heat conductivity of sand mold make shrinkage cavity,
Shrinkage porosite becomes the internal modal defect of nodular iron casting, especially for Wall-Thickness Difference bigger fly castings of wheels,
Shrinkage cavity to be completely eliminated and shrinkage defect, the part obtaining dense internal organization is extremely difficult.Shrinkage cavity in flywheel
The position assembled with the defect such as shrinkage porosite induces micro-crack, in alternate stress effect because easily occurring stress to concentrate
Under, micro-crack constantly extends, collects, intersects, and forms macroscopic cracking and causes flywheel to crack suddenly.
Engine flywheel quality is had higher requirement by high speed and the loading heavy-duty of automobile, traditional
There is the problems such as cracking because existing in dynamic balance difference and entrucking use in nodular cast iron flywheel, is difficult to meet
The performance requirement day by day increased.And in recent years, China focuses mostly at flywheel structure about the research of cast iron flywheel
Improvement, the performance boost to cast iron materials used by flywheel there is no relevant report, to improve flywheel internal soundness
High densification cast moulding method there is no in detail research.Therefore, the high-strength ball of new automobile flywheel is developed
Ink cast iron and high densification cast moulding method thereof, reliability and the safety to raising electromotor further,
Promote that the development of China's automobile industry is significant.
Summary of the invention
For problem above, the present invention provides a kind of high-strength spheroidal graphite cast-iron of Automobile flywheel and high densification casting thereof
Making manufacturing process, this spheroidal graphite cast-iron has preferable mechanical property and wearability under room temperature and 500 DEG C of high temperature, its
Room temperature tensile intensity is more than 560MPa more than 700MPa, HB more than 280,500 DEG C of Testing Tensile Strength at Elevated Temperatures.Fly
The unbalancing value of wheel, less than 1270g 〃 cm, improves dynamic balance and the safety of flywheel.
Technical scheme is as follows:
(1) a kind of high-strength spheroidal graphite cast-iron of Automobile flywheel.
The content of pearlite in alloy of the matrix of high-strength spheroidal graphite cast-iron 90%～95%, ferrite content 5%～10%,
The Nb simultaneously adding a small amount of Mn, Ni, Cr and trace carries out alloy strengthening.Alloying element composition and quality
Percentage range is: C:3.2%～3.8%, Si:2.0%～2.5%, Mn:0.1%～0.5%, Ni:0.1%～1.0%,
Cr:0.2%～1.0%, Nb:0.01%～0.05%, P :≤0.08%, S≤0.025%, Mg:0.02%～0.06%,
RE:0.01%～0.05%, surplus is Fe.
(2) a kind of Automobile flywheel high densification cast moulding method of high-strength spheroidal graphite cast-iron, including following step
Rapid:
Step 1: dispensing: raw material be the Q10 pig iron, common low carbon steel scrap, flywheel Special back furnace charge, ferrosilicon,
Ferromanganese, electrolytic nickel, ferrochrome, ferro-niobium；Each raw materials quality percentage ratio is: the Q10 pig iron: 60%～70%, general
Logical low-carbon waste steel: 15%～20%, flywheel Special back furnace charge: 15%～20%, ferrosilicon 0.5%～1.0%, ferromanganese
0.5%～1.0%, electrolytic nickel: 0.12%～1.2%, ferrochrome: 0.3%～1.2%, ferro-niobium: 0.02%～0.1%.
Step 2: Design of Runner System: running gate system is by cup, sprue, cross gate, emit with double
The hot riser of mouth neck and ingate composition.Two riser necks in hot riser are independent of one another, riser neck cross section
For flat rectangle, area is more than 500mm2, the size of two riser necks meets following condition: 1. riser neck
The 1/2 of thickness≤flywheel thickness；2. thickness 10mm～14mm in riser neck cross section, width 50mm～80mm,
Thick wide ratio≤1/5, eliminates the shrinkage porosity defect of contraction cavity within flywheel.
Step 3: moulding: unselected clay green-sand is inserted moulding on jolt squeezing machine after sandbox, sand mold
Hardness Control is in the range of 80～90, and the hardness in die cavity centre is higher than 85.
Step 4: melting: use medium-frequency induction furnace melting, by step I) raw material for preparing, by adding
Material order is: the common low carbon steel scrap+flywheel Special back furnace charge → Q10 pig iron → ferrosilicon+ferromanganese+ferrochrome+ferro-niobium
Carrying out melting, add electrolytic nickel after above-mentioned raw materials is melting down, composition prepares to come out of the stove the most afterwards, and ferrum liquid goes out furnace temperature
Degree controls at 1450 DEG C～1480 DEG C.
Step 5: spheroidising: select commercially available commercial FeSiMg8RE3 alloy as nodulizer, use lid bag
Method carries out spheroidising, and the particle size range of nodulizer is 5mm～30mm, and addition is ferrum liquid quality
1.0%～2.0%.
Step 6: inoculation: select commercially available commercial BaSiFe alloy as inovulant, breed in using bag
The inoculated technology combined with current-following inoculation.Wherein breeding in bag is to be layered on nodulizer by inovulant, surface
Covering with iron filings and consolidate, the inovulant of addition is the 1.0%～1.5% of ferrum liquid quality, and particle size range is
10mm～30mm, breeds temperature and controls at 1440 DEG C～1460 DEG C in bag；Current-following inoculation is carried out during cast, pregnant
Educate that agent addition is ferrum liquid quality 0.1%～0.15%, particle size range is 0.4mm～0.8mm.
Step 7: cast: iron liquid casting temperature controls at 1350 DEG C～1420 DEG C, for avoiding decaying spheroidisation,
The duration of pouring of every iron clad liquid, less than 20min, carries out current-following inoculation during cast.
Further, step 4 adds a small amount of Mn in During Eutectoid Decomposition, promotes perlitic transformation,
Stablize and refinement pearlite, improve elevated temperature strength and the hardness of cast iron.
Further, step 4 adds a small amount of Cr and refines pearlite, form stable eutectic carbide,
Improve thermostability and the wearability of cast iron.
Further, step 4 adds a small amount of Ni and promotes graphitization, suppress ferrite, improve spheroidal graphite casting
The intensity of ferrum.
Further, adding the Nb of trace in step 4, to form stable rich niobium hard with the carbon in ferrum liquid and nitrogen
Matter phase Nb (C, N), larger amplitude improves wearability, and meanwhile, niobium has solution strengthening and purifies the effect of crystal boundary,
Intensity and the toughness of cast iron can be improved.
Further, in step 4, the addition of above-mentioned alloying element is little, affects the preparation cost of material
Less.
Hot riser is easily formed with foundry goods connecting place and contacts thermal center, and high temperature iron liquid is intended to flow through riser neck in addition,
Making riser neck become the physics thermal center of maximum, in actual production, usually there is shrinkage cavity defect in this position, directly
Connect and cause flywheel to be scrapped.Flat riser neck area of dissipation is big, both can cool the ferrum liquid flowed through,
In reduction die cavity, the liquid contraction amount of ferrum liquid, can solidify after filling type again in good time, take full advantage of die cavity
Interior spheroidal graphite cast-iron graphitization expansion from feeding, eliminate the shrinkage cavity shrinkage porosity within flywheel.Therefore, according to all
Weighing apparatus solidification theory, arranges two flat riser necks independent of each other in hot riser, not only eliminates in flywheel
The shrinkage porosity defect of contraction cavity in portion, also eliminates the shrinkage cavity defect of flywheel and flat riser neck connecting place.
The invention has the beneficial effects as follows: the matrix of high-strength spheroidal graphite cast-iron is based on pearlite, containing a small amount of ferrum
Ferritic, turns to means with alloy, by adding a small amount of Mn, Ni, Cr and the Nb of trace, can significantly carry
The elevated temperature strength of high flywheel, hardness and wearability.Two independently of one another, the riser neck of flat structure reduces
The rising head heat affecting to flywheel, and flat pair of riser neck area of section is big, Feeding channel is smooth and easy, emits flat
Mouth neck is good with the feeding effect of flywheel junction, eliminates the shrinkage cavity defect at this position, improves the interior of flywheel
Portion's quality, improves dynamic balance and the safety of flywheel, and percent defective is down to 1.9%.
Accompanying drawing explanation
Fig. 1 is the structural representation with flat pair of riser neck rising head.
Fig. 2 is as-cast metallographic structure's figure of high-strength spheroidal graphite cast-iron.
Fig. 1 is labeled as: 1. foundry goods 2. sprue 3. cross gate 4. 5. flat pairs of riser necks of hot riser
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
Unselected clay green-sand is inserted moulding on jolt squeezing machine after sandbox, and after moulding, sand mold is hard
Degree is 90.The injection system structure of sand mold sees Fig. 1, according to the sequence of flow of ferrum liquid, by cup 2, directly
Running channel, cross gate 3, hot riser 4, flat pair of riser neck 5 and ingate composition, ferrum liquid finally flows into casting
Part 1.The cross section of flat pair of riser neck 5 is the rectangle of 10mm × 60mm.Raw material ratio is as follows: Q10
The pig iron: 64%, common low carbon steel scrap: 17%, flywheel Special back furnace charge: 15.4%, ferrosilicon 0.81%, ferromanganese
0.7%, electrolytic nickel: 1.0%, ferrochrome: 1.0%, ferro-niobium: 0.09%.Above-mentioned raw material is added intermediate frequency sense
Answer electro-smelting: the common low carbon steel scrap+flywheel Special back furnace charge → Q10 pig iron → ferrosilicon+ferromanganese+ferrochrome+
Ferro-niobium, melting down after add electrolytic nickel.FeSiMg8RE3 alloy using particle mean size as 26mm is as nodularization
Agent, addition is the 1.7% of ferrum liquid quality；BaSiFe alloy using particle mean size as 30mm is as pregnant in bag
Educating agent, be layered on nodulizer, addition is the 1.2% of ferrum liquid quality, covers nodulizer surface with iron filings
And consolidate.Ferrum liquid tapping temperature is 1480 DEG C, pours into a mould after water outlet, and pouring temperature is 1380 DEG C.
Carrying out current-following inoculation, inovulant particle mean size 0.8mm during cast, addition is the 0.12% of ferrum liquid quality.Take
After going out Wheel casting, its work surface and fitting surface are carried out turnery processing, carry out dynamic balancing measurement subsequently.Finally
The tensile property test that sample carries out under room temperature and 500 DEG C of high temperature is intercepted at flywheel radius 1/2nd.
Embodiment 2
Unselected clay green-sand is inserted moulding on jolt squeezing machine after sandbox, and after moulding, sand mold is hard
Degree is 85.The injection system structure of sand mold sees Fig. 1, according to the sequence of flow of ferrum liquid, by cup 2, directly
Running channel, cross gate 3, hot riser 4, flat pair of riser neck 5 and ingate composition, ferrum liquid finally flows into casting
Part 1.The cross section of flat pair of riser neck 5 is the rectangle of 10mm × 55mm.Raw material ratio is as follows: Q10
The pig iron: 64%, common low carbon steel scrap: 18%, flywheel Special back furnace charge: 14.26%, ferrosilicon 0.95%, manganese
Ferrum 0.9%, electrolytic nickel: 0.92%, ferrochrome: 0.9%, ferro-niobium: 0.07%.Above-mentioned raw material is added intermediate frequency
Electric induction furnace melting: the common low carbon steel scrap+flywheel Special back furnace charge → Q10 pig iron → ferrosilicon+ferromanganese+ferrochrome+
Ferro-niobium, melting down after add electrolytic nickel.FeSiMg8RE3 alloy using particle mean size as 26mm is as nodularization
Agent, addition is the 1.5% of ferrum liquid quality；BaSiFe alloy using particle mean size as 30mm is as pregnant in bag
Educating agent, be layered on nodulizer, addition is the 1.5% of ferrum liquid quality, covers nodulizer surface with iron filings
And consolidate.Ferrum liquid tapping temperature is 1460 DEG C, pours into a mould after water outlet, and pouring temperature is 1400 DEG C.
Carrying out current-following inoculation, inovulant particle mean size 0.8mm during cast, addition is the 0.15% of ferrum liquid quality.Take
After going out Wheel casting, its work surface and fitting surface are carried out turnery processing, carry out dynamic balancing measurement subsequently.Finally
The tensile property test that sample carries out under room temperature and 500 DEG C of high temperature is intercepted at flywheel radius 1/2nd.
Embodiment 3
Unselected clay green-sand is inserted moulding on jolt squeezing machine after sandbox, and after moulding, sand mold is hard
Degree is 80.The injection system structure of sand mold sees Fig. 1, according to the sequence of flow of ferrum liquid, by cup 2, directly
Running channel, cross gate 3, hot riser 4, flat pair of riser neck 5 and ingate composition, ferrum liquid finally flows into casting
Part 1.The cross section of flat pair of riser neck 5 is the rectangle of 10mm × 50mm.Raw material ratio is as follows: Q10
The pig iron: 60%, common low carbon steel scrap: 22%, flywheel Special back furnace charge: 13.96%, ferrosilicon 0.96%, manganese
Ferrum 1.0%, electrolytic nickel: 0.9%, ferrochrome: 1.1%, ferro-niobium: 0.08%.Above-mentioned raw material is added intermediate frequency
Electric induction furnace melting: the common low carbon steel scrap+flywheel Special back furnace charge → Q10 pig iron → ferrosilicon+ferromanganese+ferrochrome+
Ferro-niobium, melting down after add electrolytic nickel.FeSiMg8RE3 alloy using particle mean size as 26mm is as nodularization
Agent, addition is the 2.0% of ferrum liquid quality；BaSiFe alloy using particle mean size as 30mm is as pregnant in bag
Educating agent, be layered on nodulizer, addition is the 1.3% of ferrum liquid quality, covers nodulizer surface with iron filings
And consolidate.Ferrum liquid tapping temperature is 1470 DEG C, pours into a mould after water outlet, and pouring temperature is 1360 DEG C.
Carrying out current-following inoculation, inovulant particle mean size 0.8mm during cast, addition is the 0.13% of ferrum liquid quality.Take
After going out Wheel casting, its work surface and fitting surface are carried out turnery processing, carry out dynamic balancing measurement subsequently.Finally
The tensile property test that sample carries out under room temperature and 500 DEG C of high temperature is intercepted at flywheel radius 1/2nd.
Embodiment 4
Height prepared by the preparation of the high-strength spheroidal graphite cast-iron as shown in embodiment 1 and high solid cast manufacturing process thereof
Strong nodular cast iron flywheel, its component content is: C:3.58%, Si:2.17%, Mn:0.33%, Ni:0.93%,
Cr:0.63%, Nb:0.047%, P:0.033%, S:0.019%, Mg:0.04%, RE:0.015%,
Surplus is Fe.The unbalance dynamic quality of flywheel is 786g 〃 cm, room temperature tensile intensity 713MPa, HB value
299,500 DEG C of Testing Tensile Strength at Elevated Temperature 578MPa.
Embodiment 5
Prepared by the preparation of the high-strength spheroidal graphite cast-iron as shown in embodiment 2 and high densification cast moulding method thereof
High-strength nodular cast iron flywheel, its component content is: C:3.71%, Si:2.24%, Mn:0.39%, Ni:
0.85%, Cr:0.59%, Nb:0.043%, P:0.041%, S:0.013%, Mg:0.03%, RE:0.026%,
Surplus is Fe.The unbalancing value of flywheel is 1262g 〃 cm, room temperature tensile intensity 701MPa, HB value 289,
500 DEG C of Testing Tensile Strength at Elevated Temperature 561MPa.
Embodiment 6
Height prepared by the preparation of the high-strength spheroidal graphite cast-iron as shown in embodiment 3 and high solid cast manufacturing process thereof
Strong nodular cast iron flywheel, its component content is: C:3.43%, Si:2.09%, Mn:0.41%, Ni:0.79%,
Cr:0.71%, Nb:0.046%, P:0.08%, S:0.017%, Mg:0.03%, RE:0.021%, remaining
Amount is Fe.The unbalancing value of flywheel is 935g 〃 cm, room temperature tensile intensity 706MPa, HB value 301,
500 DEG C of Testing Tensile Strength at Elevated Temperature 569MPa.
It is above the present invention has been carried out exemplary description, it is clear that the realization of the present invention is not by aforesaid way
Restriction, as long as have employed the various improvement that technical solution of the present invention is carried out or the most improved by the present invention's
Design and technical scheme directly apply to other occasion, the most within the scope of the present invention.
Claims (7)
1. the Automobile flywheel high densification cast moulding method of high-strength spheroidal graphite cast-iron, it is characterised in that
Comprise the following steps:
Step 1: dispensing: each raw material and mass percent thereof be: the Q10 pig iron: 60%～64% is the lowest
Carbon steel scrap: 15%～20%, flywheel Special back furnace charge: 15%～20%, ferrosilicon 0.5%～1.0%, ferromanganese
0.5%～1.0%, electrolytic nickel: 0.12%～1.2%, ferrochrome: 0.3%～1.2%, ferro-niobium: 0.02%～0.1%；
Step 2: Design of Runner System: running gate system is by cup, sprue, cross gate, emit with double
The hot riser of mouth neck and ingate composition；
Step 3: moulding: unselected clay green-sand is inserted moulding on jolt squeezing machine after sandbox, sand mold
Hardness Control is in the range of 80～90, and the hardness in die cavity centre is higher than 85；
Step 4: melting: use medium-frequency induction furnace melting, raw material step 1 prepared, press charging suitable
Sequence is: the common low carbon steel scrap+flywheel Special back furnace charge → Q10 pig iron → ferrosilicon+ferromanganese+ferrochrome+ferro-niobium is carried out
Melting, adds electrolytic nickel after above-mentioned raw materials is melting down, and composition prepares to come out of the stove the most afterwards, ferrum liquid tapping temperature control
System is at 1450 DEG C～1480 DEG C；
Step 5: spheroidising: select FeSiMg8RE3 alloy as nodulizer, use lid bag method to carry out ball
Change processes；
Step 6: inoculation: select BaSiFe alloy as inovulant, breed in using bag and pregnant with stream
Educate the inoculated technology combined to process；
Step 7: when cast: iron liquid casting temperature controls at 1350 DEG C～1420 DEG C, the cast of every iron clad liquid
Between less than 20min, carry out current-following inoculation during cast.
A kind of Automobile flywheel high densification of high-strength spheroidal graphite cast-iron the most according to claim 1 is cast as
Shape method, it is characterised in that in step 2, two riser necks in the hot riser of running gate system are independent of one another,
Riser neck cross section is flat rectangle, and area is more than 500mm2, the size of two riser necks meets following condition:
1. the 1/2 of riser neck thickness≤flywheel thickness；2. thickness 10mm～14mm in riser neck cross section, width
50mm～80mm, thick wide ratio≤1/5.
A kind of Automobile flywheel high densification of high-strength spheroidal graphite cast-iron the most according to claim 1 is cast as
Shape method, it is characterised in that in step 5, the particle size range of nodulizer is 5mm～30mm, addition is ferrum
The 1.0%～2.0% of liquid quality.
A kind of Automobile flywheel high densification of high-strength spheroidal graphite cast-iron the most according to claim 1 is cast as
Shape method, it is characterised in that breed for inovulant is layered on nodulizer in the bag in step 6, surface with
Iron filings cover and consolidate, and the inovulant of addition is the 1.0%～1.5% of ferrum liquid quality, and particle size range is
10mm～30mm, temperature controls at 1440 DEG C～1460 DEG C.
A kind of Automobile flywheel high densification of high-strength spheroidal graphite cast-iron the most according to claim 1 is cast as
Shape method, it is characterised in that carry out current-following inoculation when step 7 is poured into a mould, innoculant adding quantity is ferrum liquid quality
0.1%～0.15%, particle size range is 0.4mm～0.8mm.
6. the high-strength spheroidal graphite cast-iron of Automobile flywheel, it is characterised in that by any one of claim 1-5 institute
The method stated is made.
The high-strength spheroidal graphite cast-iron of Automobile flywheel the most according to claim 6, it is characterised in that described height
The content of pearlite in alloy of the matrix of strong spheroidal graphite cast-iron is 90%～95%, and ferrite content, 5%～10%, adds few
Amount Mn, Ni, Cr and the Nb of trace, alloying element composition and mass percent scope be: C:3.2%～
3.8%, Si:2.0%～2.5%, Mn:0.1%～0.5%, Ni:0.1%～1.0%, Cr:0.2%～1.0%,
Nb:0.01%～0.05%, P :≤0.08%, S≤0.025%, Mg:0.02%～0.06%, RE:0.01%～0.05%,
Surplus is Fe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410830809.7A CN104404363B (en) | 2014-12-26 | 2014-12-26 | A kind of Automobile flywheel high-strength spheroidal graphite cast-iron and high densification cast moulding method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410830809.7A CN104404363B (en) | 2014-12-26 | 2014-12-26 | A kind of Automobile flywheel high-strength spheroidal graphite cast-iron and high densification cast moulding method thereof |
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| Publication Number | Publication Date |
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| CN104404363A CN104404363A (en) | 2015-03-11 |
| CN104404363B true CN104404363B (en) | 2016-08-17 |
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| CN105543642B (en) * | 2016-02-03 | 2017-08-29 | 上海大学兴化特种不锈钢研究院 | Urban track traffic wheel austempering ductile iron alloy material |
| CN107604239B (en) * | 2017-09-28 | 2019-07-02 | 山东金麒麟股份有限公司 | A kind of gray cast iron material and casting method and purposes |
| CN109930058B (en) * | 2017-12-19 | 2021-08-10 | 常州朗锐铸造有限公司 | Low-temperature high-strength high-toughness nodular cast iron at minus 40 ℃, preparation method thereof and railway locomotive part |
| CN109930059B (en) * | 2017-12-19 | 2021-08-10 | 常州朗锐铸造有限公司 | Low-temperature high-strength high-toughness nodular cast iron, preparation method thereof and railway locomotive part |
| CN110527899A (en) * | 2019-07-09 | 2019-12-03 | 南通市嘉诚机械有限公司 | A kind of ductile cast iron material applied on antidetonation high intensity water-cooling middle |
| CN112210718A (en) * | 2020-09-28 | 2021-01-12 | 西安理工大学 | High-thermal-conductivity and anti-melting-loss iron-based material for aluminum alloy die-casting die and preparation method thereof |
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| CN102676910A (en) * | 2012-04-22 | 2012-09-19 | 洛阳古城机械有限公司 | Vermicular iron and preparation method thereof and flywheel made of same |
| CN104148399A (en) * | 2014-06-16 | 2014-11-19 | 枣庄瑞兴机械制造有限公司 | Wear-resisting roll used for steel rolling intermediate mill frame and manufacturing method thereof |
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