CN104404363A - High-strength nodular cast iron for automobile flywheels and high-density cast molding method thereof - Google Patents
High-strength nodular cast iron for automobile flywheels and high-density cast molding method thereof Download PDFInfo
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- CN104404363A CN104404363A CN201410830809.7A CN201410830809A CN104404363A CN 104404363 A CN104404363 A CN 104404363A CN 201410830809 A CN201410830809 A CN 201410830809A CN 104404363 A CN104404363 A CN 104404363A
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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
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- 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
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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
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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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
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a high-strength nodular cast iron for automobile flywheels and a high-density cast molding method thereof. In the high-strength nodular cast iron base, the pearlite content is 90-95%, the ferrite content is 5-10%, and meanwhile, small amounts of Mn, Ni and Cr and trace amounts of Nb are added to perform alloy reinforcement. The high-strength nodular cast iron for automobile flywheels is composed of the following alloy elements in percentage by mass: 3.2%-3.8% of C, 2.0%-2.5% of Si, 0.1%-0.5% of Mn, 0.1%-1.0% of Ni, 0.2%-1.0% of Cr, 0.01%-0.25% of Nb, at most 0.08% of P, at most 0.025% of S, 0.02%-0.06% of Mg, 0.01%-0.05% of Re and the balance of Fe. The room-temperature tensile strength of the nodular cast iron is greater than 700 MPa, the HB is greater than 280, and the 500 DEG C high-temperature tensile strength is greater than 560 MPa. The live riser is provided with two independent flat riser necks to obtain the high-density flywheel casting, and the dynamic unbalance quantity of the flywheel is lower than 1270 g.cm, thereby enhancing the dynamic balance performance and safety.
Description
Technical field
The invention belongs to field of iron and steel, be specifically related to the high-strength spheroidal graphite cast iron of a kind of Automobile flywheel and high densification cast moulding method thereof.
Background technology
Along with the fast development of automobile industry, the safety performance of engine causes the attention of people gradually.Flywheel is that in diesel motor, structure is relatively simple but play the part of energy storage and driving effect, it is by storing the energy outside engine expansion stroke, make toggle cross upper and lower stop smoothly to complete auxiliary stroke, thus reduce the velocity fluctuation in engine operation process; Meanwhile, the task of driving power clutch usually taken on again by flywheel in automotive transmission.Therefore, the safety performance of flywheel can have important impact for the safety performance of engine and even car load traveling comfort.
Spheroidal graphite cast iron because having high specific tenacity and specific rigidity, excellent damping property, and can obtain the structural part with high bearing capacity by cast form, is commonly used to make the flywheel on high rotating speed, high-power diesel motor.Nodular cast iron flywheel, as the driving part of engine friction clutch coupling, produces high temperature with clutch friction plate high-speed friction in process under arms, causes tourbillon surface wear to avoid.During use, if the little and even wearing of tourbillon surface wear amount, then to the dynamic balance of flywheel and safety effects less; And wearing and tearing are comparatively large or uneven wear can accelerate the damage of flywheel, under the repeated stress effect produced at high speed rotating and worst hot case condition, flywheel easily cracks, and not only makes engine normally start, and easily cause Flywheel Disintegration, cause personnel safety accident.Therefore, the hot strength and the wear resisting property that improve flywheel spheroidal graphite cast iron seem particularly important for the general safety performance improving engine.
China focuses mostly in the improvement of flywheel structure about the research of cast iron flywheel in recent years, there is no the research promoting flywheel ductile cast iron material performance used, as:
Chinese patent CN201763497U discloses one " gasoline engine flywheel ", the structure of flywheel is: there is the stiffening web of more than four at flywheel center to edge, all the other position hollow outs, this structure saves making material, but the flywheel body structure of hollow out is unfavorable for feeding during ductile iron solidification, casting technique is had higher requirement, does not relate to the research of flywheel ductile cast iron material performance boost used simultaneously.
Chinese patent CN101270794 A discloses one " sectional flywheel of the band plastic blade of engine ", the cast iron flywheel single piece of band blade is changed into the subassembly of plastic blade wheel and cast iron flywheel, not only reduce manufacturing cost, also improve the economy of engine, but do not relate to the research of flywheel ductile cast iron material performance boost used equally.
Chinese patent CN202250542U discloses one " nodular cast iron flywheel for general gasoline engine ", by flywheel body and the disposable casting forming of gear ring spheroidal graphite cast iron, this one-piece construction not only overcomes gear ring is assemblied in the quality of fit reduction that body causes defect by heat pressing process, and the intensity of flywheel is high, lightweight, safe and reliable, but do not relate to the research of flywheel ductile cast iron material performance boost used equally.
Flywheel under high speed rotating bears huge mass force, and only possess good dynamic balance guarantee and himself operate steadily in the course of the work, this proposes very high requirement equally to the inner quality of foundry goods.Therefore, determine that the factor of flywheel security is except flywheel material therefor, the quality of flywheel inside also has material impact to it.The mushy freezing mode of current spheroidal graphite cast iron and the poor thermal conductivity of sand mold make shrinkage cavity and porosity become the inner modal defect of nodular iron casting, particularly for wall thickness difference larger fly castings of wheels, will eliminate shrinkage cavity and porosity defect completely, the part obtaining dense internal organization is quite difficult.Tiny crack is brought out at the position that in flywheel, the defect such as shrinkage cavity and porosity is assembled because easily there is stress concentration, under repeated stress effect, tiny crack is constantly expanded, collect, intersects, and formation macrocrack also causes the unexpected cracking of flywheel.
High speed and the loading heavy-duty of automobile are had higher requirement to engine flywheel quality, and traditional nodular cast iron flywheel, because existing in dynamic balance difference and entrucking use, the problems such as cracking occurs, and has been difficult to meet the performance requriements day by day increased.And in recent years, China focuses mostly in the improvement of flywheel structure about the research of cast iron flywheel, relevant report be there is no to the performance boost of flywheel cast iron materials used, the high densification cast moulding method improving flywheel internal soundness be there is no and study in great detail.Therefore, the high-strength spheroidal graphite cast iron of development of new Automobile flywheel and high densification cast moulding method thereof, to the reliability and the security that improve engine further, promote that the development of China's automobile industry is significant.
Summary of the invention
For above problem, the invention provides the high-strength spheroidal graphite cast iron of a kind of Automobile flywheel and high densification cast moulding method thereof, this spheroidal graphite cast iron has good mechanical property and wear resistance under room temperature and 500 DEG C of high temperature, its room temperature tensile intensity is greater than 700MPa, HB is greater than 280, and 500 DEG C of Testing Tensile Strength at Elevated Temperatures are greater than 560MPa.The unbalancing value of flywheel, lower than 1270gcm, improves dynamic balance and the security of flywheel.
Technical scheme of the present invention is as follows:
(1) the high-strength spheroidal graphite cast iron of a kind of Automobile flywheel.
The content of pearlite in alloy of the matrix of high-strength spheroidal graphite cast iron is 90% ~ 95%, and ferrite content is 5% ~ 10%, and the Nb simultaneously adding a small amount of Mn, Ni, Cr and trace carries out alloy strengthening.Alloying element composition and mass percent scope are: 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) an Automobile flywheel high densification cast moulding method for high-strength spheroidal graphite cast iron, comprises the following steps:
Step 1: batching: raw material is 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 per-cent is: the Q10 pig iron: 60% ~ 70%, common low 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: gating system is by sprue cup, sprue, cross gate, form with the hot riser of two riser neck and ingate.Two riser necks in hot riser are independent of one another, and riser neck cross section is flat rectangle, and area is greater than 500mm
2, the size of two riser necks meets the following conditions: 1. riser neck thickness≤flywheel thickness 1/2; 2. the thickness 10mm ~ 14mm in riser neck cross section, width 50mm ~ 80mm, thick wide ratio≤1/5, eliminates the shrinkage porosity defect of contraction cavity of flywheel inside.
Step 3: moulding: unselected clay green sand is inserted moulding on jolt squeezing machine after sandbox, sand hardness controls in 80 ~ 90 scopes, and the hardness in die cavity centre is higher than 85.
Step 4: melting: adopt medium-frequency induction furnace melting, by step I) starting material that prepare, by order of addition(of ingredients) be: the common low carbon steel scrap+flywheel Special back furnace charge → Q10 pig iron → ferrosilicon+ferromanganese+ferrochrome+ferro-niobium carries out melting, electrolytic nickel is added after above-mentioned raw materials is melting down, prepare after uniform composition to come out of the stove, iron liquid tapping temperature controls at 1450 DEG C ~ 1480 DEG C.
Step 5: spheroidizing: select commercially available commercial FeSiMg8RE3 alloy as nodulizing agent, adopt lid bag method to carry out spheroidizing, the size range of nodulizing agent is 5mm ~ 30mm, and add-on is 1.0% ~ 2.0% of iron liquid quality.
Step 6: inoculation: select commercially available commercial BaSiFe alloy as nucleating agent, adopts in bag and breeds the inoculated technology combined with current-following inoculation.Wherein breeding in bag is be layered on nodulizing agent by nucleating agent, and surface covers and tamping with iron filings, and the nucleating agent added is 1.0% ~ 1.5% of iron liquid quality, and size range is 10mm ~ 30mm, breeds temperature and control at 1440 DEG C ~ 1460 DEG C in bag; Carry out current-following inoculation during cast, innoculant adding quantity is 0.1% ~ 0.15% of iron liquid quality, and size range is 0.4mm ~ 0.8mm.
Step 7: cast: iron liquid casting temperature controls at 1350 DEG C ~ 1420 DEG C, and for avoiding decaying spheroidisation, the duration of pouring of every iron clad liquid is no more than 20min, carries out current-following inoculation during cast.
Further, add a small amount of Mn in step 4 and promote perlitic transformation in During Eutectoid Decomposition, stable and refine pearlite, improve hot strength and the hardness of cast iron.
Further, add a small amount of Cr refine pearlite in step 4, form stable eutectic carbides, improve thermotolerance and the wear resistance of cast iron.
Further, add a small amount of Ni in step 4 and promote greying, suppress ferrite, improve the intensity of spheroidal graphite cast iron.
Further, add the Nb of trace, form stable rich niobium hard phase Nb (C, N), more significantly improve wear resistance with the carbon in iron liquid and nitrogen in step 4, meanwhile, niobium has the effect of solution strengthening and purification crystal boundary, can improve intensity and the toughness of cast iron.
Further, in step 4, the addition of above-mentioned alloying element is little, less on the preparation cost impact of material.
Hot riser is easily formed with foundry goods connecting place and contacts thermal center, and high temperature iron liquid all will flow through riser neck in addition, and make the physics thermal center that riser neck becomes maximum, in actual production, this position usually occurs shrinkage cavity defect, directly causes flywheel to be scrapped.Flat riser neck area of dissipation is large, both can the iron liquid flowed through be cooled, and reduced the liquid contraction amount of iron liquid in die cavity, can solidify after filling type again in good time, take full advantage of spheroidal graphite cast iron graphitization expansion in die cavity from feeding, eliminate the shrinkage cavity shrinkage porosity of flywheel inside.Therefore, according to Proportional Solidification Theory, hot riser arranges two flat riser necks independent of each other, not only eliminates the shrinkage porosity defect of contraction cavity of flywheel inside, also eliminate 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, based on perlite, containing a small amount of ferrite, turns to means with alloy, by adding a small amount of Mn, Ni, Cr and the Nb of trace, significantly can improve the hot strength of flywheel, hardness and wear resistance.Two riser necks that are independent of one another, flat structure reduce the heat affecting of rising head to flywheel, and flat pair of riser neck section area is large, Feeding channel is smooth and easy, good to the feeding effect of flat riser neck and flywheel junction, eliminate the shrinkage cavity defect at this position, improve the internal soundness of flywheel, improve dynamic balance and the security of flywheel, scrap rate is down to 1.9%.
Accompanying drawing explanation
Fig. 1 is the structural representation of band flat pair of riser neck rising head.
Fig. 2 is the as-cast metallographic structure figure of high-strength spheroidal graphite cast iron.
Be labeled as in Fig. 1: 1. foundry goods 2. sprue 3. cross gate 4. hot riser 5. flat pairs of riser necks
Embodiment
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, after moulding, the hardness of sand mold is 90.The injection system structure of sand mold is see Fig. 1, and according to the sequence of flow of iron liquid, be made up of sprue cup 2, sprue, cross gate 3, hot riser 4, flat pair of riser neck 5 and ingate, iron liquid finally flows into foundry goods 1.The cross section of flat pair of riser neck 5 is the rectangle of 10mm × 60mm.Raw material ratio is as follows: the Q10 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 starting material are added medium-frequency induction furnace melting: the common low carbon steel scrap+flywheel Special back furnace charge → Q10 pig iron → ferrosilicon+ferromanganese+ferrochrome+ferro-niobium, adds electrolytic nickel after melting down again.With mean particle size be the FeSiMg8RE3 alloy of 26mm as nodulizing agent, add-on is 1.7% of iron liquid quality; With mean particle size be 30mm BaSiFe alloy as bag in nucleating agent, be layered on nodulizing agent, add-on is 1.2% of iron liquid quality, with iron filings ball covering on soil agent surface and tamping.Iron liquid tapping temperature is 1480 DEG C, pours into a mould after water outlet, and teeming temperature is 1380 DEG C.Carry out current-following inoculation during cast, nucleating agent mean particle size 0.8mm, add-on is 0.12% of iron liquid quality.After taking out Wheel casting, turnery processing is carried out to its working face and fitting surface, carry out dynamic balancing measurement subsequently.The tensile property test under normal temperature and 500 DEG C of high temperature is finally carried out from flywheel radius 1/2nd intercepting sample.
Embodiment 2
Unselected clay green sand is inserted moulding on jolt squeezing machine after sandbox, after moulding, the hardness of sand mold is 85.The injection system structure of sand mold is see Fig. 1, and according to the sequence of flow of iron liquid, be made up of sprue cup 2, sprue, cross gate 3, hot riser 4, flat pair of riser neck 5 and ingate, iron liquid finally flows into foundry goods 1.The cross section of flat pair of riser neck 5 is the rectangle of 10mm × 55mm.Raw material ratio is as follows: the Q10 pig iron: 64%, common low carbon steel scrap: 18%, flywheel Special back furnace charge: 14.26%, ferrosilicon 0.95%, ferromanganese 0.9%, electrolytic nickel: 0.92%, ferrochrome: 0.9%, ferro-niobium: 0.07%.Above-mentioned starting material are added medium-frequency induction furnace melting: the common low carbon steel scrap+flywheel Special back furnace charge → Q10 pig iron → ferrosilicon+ferromanganese+ferrochrome+ferro-niobium, adds electrolytic nickel after melting down again.With mean particle size be the FeSiMg8RE3 alloy of 26mm as nodulizing agent, add-on is 1.5% of iron liquid quality; With mean particle size be 30mm BaSiFe alloy as bag in nucleating agent, be layered on nodulizing agent, add-on is 1.5% of iron liquid quality, with iron filings ball covering on soil agent surface and tamping.Iron liquid tapping temperature is 1460 DEG C, pours into a mould after water outlet, and teeming temperature is 1400 DEG C.Carry out current-following inoculation during cast, nucleating agent mean particle size 0.8mm, add-on is 0.15% of iron liquid quality.After taking out Wheel casting, turnery processing is carried out to its working face and fitting surface, carry out dynamic balancing measurement subsequently.The tensile property test under normal temperature and 500 DEG C of high temperature is finally carried out from flywheel radius 1/2nd intercepting sample.
Embodiment 3
Unselected clay green sand is inserted moulding on jolt squeezing machine after sandbox, after moulding, the hardness of sand mold is 80.The injection system structure of sand mold is see Fig. 1, and according to the sequence of flow of iron liquid, be made up of sprue cup 2, sprue, cross gate 3, hot riser 4, flat pair of riser neck 5 and ingate, iron liquid finally flows into foundry goods 1.The cross section of flat pair of riser neck 5 is the rectangle of 10mm × 50mm.Raw material ratio is as follows: the Q10 pig iron: 60%, common low carbon steel scrap: 22%, flywheel Special back furnace charge: 13.96%, ferrosilicon 0.96%, ferromanganese 1.0%, electrolytic nickel: 0.9%, ferrochrome: 1.1%, ferro-niobium: 0.08%.Above-mentioned starting material are added medium-frequency induction furnace melting: the common low carbon steel scrap+flywheel Special back furnace charge → Q10 pig iron → ferrosilicon+ferromanganese+ferrochrome+ferro-niobium, adds electrolytic nickel after melting down again.With mean particle size be the FeSiMg8RE3 alloy of 26mm as nodulizing agent, add-on is 2.0% of iron liquid quality; With mean particle size be 30mm BaSiFe alloy as bag in nucleating agent, be layered on nodulizing agent, add-on is 1.3% of iron liquid quality, with iron filings ball covering on soil agent surface and tamping.Iron liquid tapping temperature is 1470 DEG C, pours into a mould after water outlet, and teeming temperature is 1360 DEG C.Carry out current-following inoculation during cast, nucleating agent mean particle size 0.8mm, add-on is 0.13% of iron liquid quality.After taking out Wheel casting, turnery processing is carried out to its working face and fitting surface, carry out dynamic balancing measurement subsequently.The tensile property test under normal temperature and 500 DEG C of high temperature is finally carried out from flywheel radius 1/2nd intercepting sample.
Embodiment 4
By high-strength nodular cast iron flywheel prepared by preparation and the high solid cast manufacturing process thereof of the high-strength spheroidal graphite cast iron shown in embodiment 1, 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 786gcm, room temperature tensile intensity 713MPa, HB value 299,500 DEG C of Testing Tensile Strength at Elevated Temperature 578MPa.
Embodiment 5
By high-strength nodular cast iron flywheel prepared by preparation and the high densification cast moulding method thereof of the high-strength spheroidal graphite cast iron shown in embodiment 2, 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 1262gcm, room temperature tensile intensity 701MPa, HB value 289,500 DEG C of Testing Tensile Strength at Elevated Temperature 561MPa.
Embodiment 6
By high-strength nodular cast iron flywheel prepared by preparation and the high solid cast manufacturing process thereof of the high-strength spheroidal graphite cast iron shown in embodiment 3, 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%, surplus is Fe.The unbalancing value of flywheel is 935gcm, room temperature tensile intensity 706MPa, HB value 301,500 DEG C of Testing Tensile Strength at Elevated Temperature 569MPa.
More than to invention has been exemplary description; obvious realization of the present invention is not subject to the restrictions described above; as long as have employed the various improvement that technical solution of the present invention is carried out; or design of the present invention and technical scheme directly applied to other occasion, all in protection scope of the present invention without to improve.
Claims (7)
1. an Automobile flywheel high densification cast moulding method for high-strength spheroidal graphite cast iron, is characterized in that, comprise the following steps:
Step 1: batching: each raw material and mass percent thereof are: the Q10 pig iron: 60% ~ 70%, common low 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: gating system is by sprue cup, sprue, cross gate, form with the hot riser of two riser neck and ingate;
Step 3: moulding: unselected clay green sand is inserted moulding on jolt squeezing machine after sandbox, sand hardness controls in 80 ~ 90 scopes, and the hardness in die cavity centre is higher than 85;
Step 4: melting: adopt medium-frequency induction furnace melting, the starting material that step 1 is prepared, by order of addition(of ingredients) be: the common low carbon steel scrap+flywheel Special back furnace charge → Q10 pig iron → ferrosilicon+ferromanganese+ferrochrome+ferro-niobium carries out melting, electrolytic nickel is added after above-mentioned raw materials is melting down, prepare after uniform composition to come out of the stove, iron liquid tapping temperature controls at 1450 DEG C ~ 1480 DEG C;
Step 5: spheroidizing: select FeSiMg8RE3 alloy as nodulizing agent, adopts lid bag method to carry out spheroidizing;
Step 6: inoculation: select BaSiFe alloy as nucleating agent, adopts in bag and breeds the inoculated technology process combined with current-following inoculation;
Step 7: cast: iron liquid casting temperature controls at 1350 DEG C ~ 1420 DEG C, and the duration of pouring of every iron clad liquid is no more than 20min, carries out current-following inoculation during cast.
2. a kind of Automobile flywheel according to claim 1 high densification cast moulding method of high-strength spheroidal graphite cast iron, it is characterized in that, in step 2 gating system hot riser on two riser necks independent of one another, riser neck cross section is flat rectangle, and area is greater than 500mm
2, the size of two riser necks meets the following conditions: 1. riser neck thickness≤flywheel thickness 1/2; 2. the thickness 10mm ~ 14mm in riser neck cross section, width 50mm ~ 80mm, thick wide ratio≤1/5.
3. a kind of Automobile flywheel according to claim 1 high densification cast moulding method of high-strength spheroidal graphite cast iron, is characterized in that, in step 5, the size range of nodulizing agent is 5mm ~ 30mm, and add-on is 1.0% ~ 2.0% of iron liquid quality.
4. a kind of Automobile flywheel according to claim 1 high densification cast moulding method of high-strength spheroidal graphite cast iron, it is characterized in that, breed for nucleating agent is layered on nodulizing agent in bag in step 6, surface covers and tamping with iron filings, the nucleating agent added is 1.0% ~ 1.5% of iron liquid quality, size range is 10mm ~ 30mm, and temperature controls at 1440 DEG C ~ 1460 DEG C.
5. a kind of Automobile flywheel according to claim 1 high densification cast moulding method of high-strength spheroidal graphite cast iron, it is characterized in that, carry out current-following inoculation when step 7 is poured into a mould, innoculant adding quantity is 0.1% ~ 0.15% of iron liquid quality, and size range is 0.4mm ~ 0.8mm.
6. the high-strength spheroidal graphite cast iron of Automobile flywheel, it is characterized in that, 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, Ni, the Nb of Cr and trace, alloying element composition and mass percent scope are: 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.
7. the high-strength spheroidal graphite cast iron of Automobile flywheel, is characterized in that, makes by the method described in any one of claim 1-5.
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| CN107604239A (en) * | 2017-09-28 | 2018-01-19 | 山东金麒麟股份有限公司 | A kind of gray cast iron material and casting method and purposes |
| CN109930058A (en) * | 2017-12-19 | 2019-06-25 | 常州朗锐铸造有限公司 | - 40 DEG C of low-temperature high-strength high-ductility spheroidal graphite cast-iron and preparation method thereof and railway locomotive components |
| CN109930059A (en) * | 2017-12-19 | 2019-06-25 | 常州朗锐铸造有限公司 | Low-temperature high-strength high-ductility spheroidal graphite cast-iron and preparation method thereof and railway locomotive components |
| 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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| CN105543642A (en) * | 2016-02-03 | 2016-05-04 | 上海大学兴化特种不锈钢研究院 | Isothermal quenching nodular cast iron alloy material for wheels in urban rail transit |
| 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 |
| CN107604239A (en) * | 2017-09-28 | 2018-01-19 | 山东金麒麟股份有限公司 | A kind of gray cast iron material and casting method and purposes |
| 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 |
| CN109930058A (en) * | 2017-12-19 | 2019-06-25 | 常州朗锐铸造有限公司 | - 40 DEG C of low-temperature high-strength high-ductility spheroidal graphite cast-iron and preparation method thereof and railway locomotive components |
| CN109930059A (en) * | 2017-12-19 | 2019-06-25 | 常州朗锐铸造有限公司 | Low-temperature high-strength high-ductility spheroidal graphite cast-iron and preparation method thereof and railway locomotive components |
| 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 |
| 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 |
| 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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