CN103451510B - The manufacture method of vermicular cast iron piston ring - Google Patents
The manufacture method of vermicular cast iron piston ring Download PDFInfo
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- CN103451510B CN103451510B CN201310366867.4A CN201310366867A CN103451510B CN 103451510 B CN103451510 B CN 103451510B CN 201310366867 A CN201310366867 A CN 201310366867A CN 103451510 B CN103451510 B CN 103451510B
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Abstract
The invention discloses a kind of manufacture method of vermicular cast iron piston ring, chemical composition in described vermicular cast iron piston ring material and weight percentage are C:3.4% ~ 4.0%, Si:2.4% ~ 3.2%, Mn≤0.3%, Cr:0.2% ~ 0.4%, Mo:0.2% ~ 0.6%, Cu:0.5% ~ 1.0%, Ti:0.05% ~ 0.15%, P≤0.1%, S≤0.05%, Mg:0.009% ~ 0.02%, all the other are Fe and inevitable impurity; The manufacture method of vermicular cast iron piston ring comprises the processing steps such as moulding, melting, cast, knockout, ball blast, machining, surface treatment.Present invention achieves the sheet of piston ring, production process is relatively simple, and the vermicular cast iron piston ring of production has snappiness, high strength, high tenacity and high-wearing feature.
Description
Technical field
The present invention relates to a kind of manufacture method of gas engine part, specifically a kind of manufacture method of cast-iron piston ring.
Background technology
Oil engine is a kind of broad-spectrum motive power machine equipment, and it is burnt at machine intimate by fuel, and the heat energy discharged directly is converted to the Thermal Motor of kinetic energy.Piston ring is one of component of key in I. C. engine.Along with engine is to the future development of small volume, lightweight, high rotating speed, high-power, low emission, low oil consumption, low cost, wear-resisting, environmental protection, the design requirements of piston ring also trends towards day by day to future developments such as lightweight, high strength, snappiness, low friction, low cost, wear-resisting, environmental protection.
Piston ring plays a part sealed combustion chamber and crankcase, transmission piston heat, controls oil consumption in diesel motor, piston ring in the course of the work, high temperature, high pressure should be born, bear violent wearing and tearing and larger impact load effect again, especially first, second road ring, need to bear very large shock load, working conditions is quite severe, and therefore piston ring must have good wear resistance, higher intensity and enough toughness.But due to piston ring along with the development of engine highly starts thinning, particularly the height of first, second road ring becomes 1 ~ 1.5mm from original 3mm, this makes the piston ring of traditional gray cast iron material manufacture become difficulty highly thinning with post-treatment, and it is even cracked easily to fracture in use procedure.Piston ring material in current industry is except use graphitic cast iron is produced, also have and adopt ductile cast iron material to produce, due to wearing no resistance of spheroidal graphite cast iron, in order to improve the mechanical property of ductile iron piston ring, generally also need to carry out chromium plating process after the piston ring machining that ductile cast iron material is produced completes, and the complex procedures of chrome-plated process, and scrap rate is high, which adds the production cost of ductile iron piston ring.
Summary of the invention
The technical issues that need to address of the present invention are to provide a kind of manufacture method of vermicular cast iron piston ring, realize the sheet of piston ring, and production process is relatively simple, and the piston ring of production has snappiness, high strength, high tenacity and high-wearing feature.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
A manufacture method for vermicular cast iron piston ring, the chemical composition in described vermicular cast iron piston ring material and weight percentage are
C:3.4% ~ 4.0%, Si:2.4% ~ 3.2%, Mn≤0.3%, Cr:0.2% ~ 0.4%, Mo:0.2% ~ 0.6%, Cu:0.5% ~ 1.0%, Ti:0.05% ~ 0.15%, P≤0.1%, S≤0.05%, Mg:0.009% ~ 0.02%, all the other are Fe and inevitable impurity;
Further improvement of the present invention is: the manufacture method of vermicular cast iron piston ring comprises the following steps:
A, folded case make sand mold;
B, by the starting material making vermicular cast iron piston ring by weight percentage composition proportioning put into electric furnace melting, be at the uniform velocity warming up to temperature of superheat and carry out Overheating Treatment, then leave standstill and make the melt temperature in electric furnace naturally cool to the tapping temperature of 1560 DEG C ~ 1600 DEG C;
Watering the pre-buried rare earth magnesium vermiculizer accounting for casting ladle volume 0.3% ~ 0.8% in pit at the bottom of handbag, pour the liquation reaching tapping temperature in electric furnace into casting ladle at twice, first time pours the liquation accounting for casting ladle 2/3 volume into, leaves standstill 1min ~ 2min afterwards, and second time pours the liquation accounting for casting ladle 1/3 volume into; Wherein pour in the process of liquation in second time and carry out twice current-following inoculation process with silicon strontium nucleating agent, add that total amount is casting ladle volume 0.4% ~ 0.8% of the nucleating agent of twice current-following inoculation process, after the temperature of the potting syrup in casting ladle is down to the teeming temperature of 1380 DEG C ~ 1440 DEG C, casting sand mould obtains blank;
After C, blank cool to room temperature, knockout separates sand mold and blank, carries out Shot Blasting to blank;
Carry out modifier treatment after D, rough turn blank, be then machined to size, and carry out surfaces nitrided process, pack warehouse-in after the assay was approved.
Further improvement of the present invention is: adopt dedicated templates to make sand mold in steps A, described dedicated templates comprises base plate and is arranged on the gating system on base plate; Described gating system comprises the sprue intersected vertically with base plate plane, and the cross gate that be arranged on base plate in the middle part of crossing with sprue, base plate arranges four piston ring models along the zygomorphy of cross gate, and described piston ring model is connected with cross gate by ingate.
Further improvement of the present invention is: described sprue intersects vertically and is arranged on the center of cross gate.
Further improvement of the present invention is: in step B, and the temperature of carrying out Overheating Treatment is 1580 DEG C ~ 1620 DEG C.
Further improvement of the present invention is: in step B when carrying out twice current-following inoculation process, and the nucleating agent granularity added during first time inoculation is 3mm ~ 6mm, and the add-on of nucleating agent is 0.2% ~ 0.4% of casting ladle volume; The nucleating agent granularity added during second time inoculation is 1mm ~ 3mm, and the add-on of nucleating agent is 0.2% ~ 0.4% of casting ladle volume.
Further improvement of the present invention is: in step B, potting syrup is when casting sand mould obtains blank, and potting syrup is poured within 3min.
Further improvement of the present invention is: the modifier treatment of step D comprises first quenching, rear tempering two procedures, and wherein quenching temperature is 900 DEG C ~ 940 DEG C, oil cooling after insulation 2h; Tempering temperature is 520 DEG C ~ 560 DEG C, comes out of the stove air cooling to room temperature after insulation 2h.
Owing to have employed technique scheme, the technical progress that the present invention obtains is:
The present invention is by the control to the chemical composition in piston ring material and weight percentage, chemical composition in adjustment piston ring material, obtain a kind of special vermicular graphite iron material, the tensile strength of this kind of material, unit elongation, toughness and fatigue resistance are all higher than common cast alloy iron, also possess damping, thermal conductivity and the wear resisting property of common cast alloy iron simultaneously, particularly this Drawing abillity is far superior to other cast alloy iron, and postorder adds man-hour every sheet vermicular cast iron piston ring cost can reduce by 15%.Wear resistance and the toughness of the vermicular cast iron piston ring adopting the present invention to obtain are better than ductile iron piston ring, meet the performance need of piston ring.The present invention uses rational production technique, directly surfaces nitrided process is carried out after mechanical workout completes, require no chromium plating process, eradicate the problem that chromeplated product scrap rate is high, greatly reduce the consumption of the energy simultaneously, every sheet vermicular cast iron piston ring decreases 30% than the production cost of ductile iron piston ring, reduces production cost, improves production efficiency.
Use the present invention to produce the vermicular cast iron piston ring obtained and have good shock-resistance, thermal fatigue resistance and wear resistance, processing characteristics is excellent, and cost is low, and integrated yield is high.Young's modulus>=the 125000N/mm of the vermicular cast iron piston ring finally obtained
2, bending strength>=1100N/mm
2, tensile strength>=700N/mm
2, thermostability>=92%, hardness is HRB100 ~ 113.
Select rare earth magnesium as vermiculizer, and rare earth magnesium vermiculizer is embedded at the bottom of the bag of casting ladle, both can guarantee vermiculation effect carrying out creepage rate, and also make compactedization reaction process mild, eliminate potential safety hazard, ensured the safety of staff.Select silicon strontium as nucleating agent, and carry out the process of secondary current-following inoculation, prevent from forming carbide, improve the toughness of product.
Adopt dedicated templates to carry out moulding, prevent because the frequent dismounting of mould causes size deviation, reduce error, improve dimensional precision, rate of reducing the number of rejects and seconds.Dedicated templates upper system layout is reasonable, guarantees that potting syrup flowing is mild, velocity-stabilization, sprue is arranged on the center of cross gate, is conducive to potting syrup and is rationally full of sand mold, reduce casting flaw, improve blank quality.
Carry out Overheating Treatment to liquation, Overheating Treatment temperature is 1580 DEG C ~ 1620 DEG C, improves the purity of liquation.Carry out twice current-following inoculation process, avoid the formation of carbide, ensure intensity and the toughness of product.When pouring into a mould, potting syrup is poured within 3min, prevents teeming temperature too low, ensure that the effect of inoculation and creepage rate simultaneously.
Accompanying drawing explanation
Fig. 1 is dedicated templates schematic diagram of the present invention;
Fig. 2 is 100 × graphite form figure of the embodiment of the present invention 1 gained blank;
Fig. 3 is 500 × matrix figure of the embodiment of the present invention 1 gained blank.
Wherein, 1, base plate, 2, sprue, 3, cross gate, 4, ingate.
Embodiment
Vermicular cast iron piston ring, the chemical composition in described piston ring and weight percentage are:
C:3.4% ~ 4.0%, Si:2.4% ~ 3.2%, Mn≤0.3%, Cr:0.2% ~ 0.4%, Mo:0.2% ~ 0.6%, Cu:0.5% ~ 1.0%, Ti:0.05% ~ 0.15%, P≤0.1%, S≤0.05%, Mg:0.009% ~ 0.02%, all the other are Fe and inevitable impurity.
Chemical composition in above-mentioned vermicular cast iron piston ring and weight percentage are preferably:
C:3.6% ~ 3.8%, Si:2.6% ~ 2.8%, Mn:0.05% ~ 0.2%, Cr:0.2% ~ 0.3%, Mo:0.3% ~ 0.5%, Cu:0.55% ~ 0.7%, Ti:0.1% ~ 0.13%, P≤0.08%, S≤0.03%, Mg:0.011% ~ 0.015%, all the other are Fe and inevitable impurity.
Below in conjunction with embodiment, the present invention is described in further details:
Embodiment 1
A kind of vermicular cast iron piston ring, when carrying out proportioning raw materials, selects high-quality raw material, chemical composition in described piston ring and the design objective of weight percentage are: C:3.7% ~ 3.8%, Si:2.6% ~ 2.8%, Mn:0.1% ~ 0.2%, Cr:0.25% ~ 0.3%, Mo:0.35% ~ 0.45%, Cu:0.55% ~ 0.6%, Ti:0.1% ~ 0.15%, P≤0.08%, S≤0.03%, Mg:0.011% ~ 0.015%, all the other are Fe and inevitable impurity.
The manufacture method of vermicular cast iron piston ring comprises the following steps:
A, employing dedicated templates carry out moulding, namely on air pressure jolt molding machine, make sand mold, afterwards the sand mold made are placed into cast station place.Dedicated templates as shown in Figure 1, the gating system comprising base plate 1, be fixed on four piston ring models on base plate 1 and be arranged on base plate 1.Described gating system mainly comprises sprue 2, cross gate 3 and ingate 4.Sprue 2 is arranged on base plate center and vertical with base plate plane.Cross gate 3 is arranged on base plate, is connected with sprue 2, and the axis of sprue 2 is positioned on the perpendicular bisector of the axis of cross gate 3.Base plate 1 arranges four piston ring models along the zygomorphy of cross gate 3, and ingate 4 and piston ring model one_to_one corresponding arrange four, and one end of ingate 4 is connected with cross gate 3, and the other end connects each piston ring model respectively.
Adopt multiple mould when making sand mold, often pile type type height is 685mm ~ 720mm, and the hardness of sand mold is 85 ~ 95.The performance requriements of moulding molding sand comprises: green compression strength 1.5Kg/cm
2~ 1.8Kg/cm
2, compact rate of molding 25% ~ 40%, ventilation property>=50, water content 3.3% ~ 4%, silt content≤15%, effective bentonite content>=8%.
B, to be placed in frequency conversion electric furnace to carry out melting by making starting material that vermicular cast iron piston ring needs by the weight percentage proportioning of various component, except the content of C, Si has particular requirement, the chemical composition of all the other components is all by chemical composition content control after stove.
During melting, in electric furnace inner melt chemical composition, C considers the scaling loss amount of 0.1%, can be controlled in 3.8% ~ 3.9%, adds the Q10 pig iron and be adjusted to more than 3.8% when being less than 3.8%; Add steel scrap when being greater than 3.9% and be adjusted to less than 3.9%.
Consider melting complete after the silicon strontium nucleating agent that adds when carrying out inoculation of liquation the Si content in liquation can be caused to improve about 0.5%, in electric furnace during melting liquation chemical composition in Si content control 2.1% ~ 2.3%, in stove, add silicon metal or 75 ferrosilicon when being less than 2.1%, make Si content be greater than 2.1%; In stove, add the Q10 pig iron or steel scrap when being greater than 2.3%, make Si content be less than 2.3%, the Q10 pig iron added or steel scrap must preheatings.
In fusion process, electric furnace at the uniform velocity heats up, and the tapping temperature of liquation is 1560 DEG C ~ 1600 DEG C.For improving liquation purity, Overheating Treatment is carried out to liquation, superheating temperature is selected higher than liquation tapping temperature 15 DEG C ~ 25 DEG C, after namely first liquation constant-speed heating being warmed up to 1580 DEG C ~ 1620 DEG C, leaving standstill and makes the liquation in frequency conversion electric furnace naturally cool to 1560 DEG C ~ 1600 DEG C.
After leaving standstill tapping temperature, liquation is turned at twice from frequency conversion electric furnace and pours in casting ladle.First the liquation accounting for casting ladle 2/3 volume is poured into, liquation is made to start to carry out compactedization reaction, the vermiculizer of compactedization reaction needed selects rare earth magnesium vermiculizer, pour liquation in casting ladle before, watering in the pit at the bottom of handbag by vermiculizer pre-plugged, the add-on of vermiculizer accounts for 0.3% ~ 0.8% of casting ladle volume.The liquation of 2/3 volume poured into leaves standstill that 1 ~ 2min waits for that compactedization reacts completely, liquation steadily after, then continue to pour into residue casting ladle volume 1/3 liquation until be full of casting ladle.
Because the weight percentage of Mo, Cu chemical composition in liquation is higher; Simultaneously because make the super cooling tendency of liquation increase adding of vermiculizer, therefore obtain at cooling forming easily forming firmly crisp carbide tissue in the process of blank.For avoiding the formation of carbide tissue, after creepage rate, when pouring the liquation of 1/3 of residue casting ladle volume into, inoculation is carried out to liquation.In the present invention, silicon strontium nucleating agent selected by nucleating agent, for making silicon strontium nucleating agent be fully absorbed, adopts twice current-following inoculation process during inoculation.The nucleating agent granularity added during first time inoculation is 3mm ~ 6mm, and innoculant adding quantity is 0.2% ~ 0.4% of casting ladle volume; The nucleating agent granularity added during second time inoculation is 1mm ~ 3mm, and the add-on of nucleating agent is 0.2% ~ 0.4% of casting ladle volume.The total amount of the nucleating agent that twice inoculation adds is 0.4% ~ 0.8% of casting ladle volume.
After inoculation completes, casting ladle is moved to the cast station place of placing sand mold, after the teeming temperature that the potting syrup temperature in casting ladle is down to 1380 DEG C ~ 1440 DEG C, potting syrup is poured into standing in sand mold, the obtained blank of cooling.For keeping compactedization and pregnant effect, prevent teeming temperature too low, when casting sand mould, potting syrup must be poured within 3min.
Chemical composition analysis is carried out to the vermicular cast iron piston ring blank obtained, obtains chemical composition in blank and weight percentage is: C:3.8%, Si:2.8%, Mn:0.2%, Cr:0.3%, Mo:0.38%, Cu:0.58%, Ti:0.12%, P:0.08%, S:0.025%, Mg:0.013%.
C, after blank cool to room temperature, sand mold and blank are placed on together in viberating knock-out machie and carry out knockout and be separated, the blank obtained carries out Shot Blasting, removes blank surface scab.
D, blank carried out rough turn after carry out modifier treatment, first quench during modifier treatment, quenching temperature is 900 DEG C ~ 940 DEG C, oil cooling after insulation 2h; Carry out tempering afterwards, tempering temperature is 520 DEG C ~ 560 DEG C, comes out of the stove air cooling to room temperature after insulation 2h.
Rough turn blank after modifier treatment completes proceeds to machine shop and carries out precision work according to size, and carry out surfaces nitrided process afterwards and obtain vermicular cast iron piston ring product, product is through packing warehouse-in after the assay was approved.
The present embodiment passes through the chemical composition in adjustment material and uses rational casting production process, and the hardness of the vermicular cast iron piston ring after modifier treatment completes is HRB106; Young's modulus is 142955N/mm
2; Thermostability is 97.2%; Bending strength is 1100N/mm
2; Tensile strength is 732N/mm
2.
As shown in Figure 2 and Figure 3, graphite form is quasiflake graphite to metallographic microstructure, and its two-dimentional surface polishing observes the quasiflake graphite having 80% at least, and all the other are globular graphite; Matrix is tempered sorbite.
Embodiment 2
Processing condition in the present embodiment, manufacture method are identical with embodiment 1, are with the difference of embodiment 1:
Chemical composition in the present embodiment in vermicular cast iron piston ring and the design objective of weight percentage are:
C:3.6% ~ 3.7%, Si:2.6% ~ 2.7%, Mn:0.1% ~ 0.3%, Cr:0.2% ~ 0.3%, Mo:0.25% ~ 0.3%, Cu:0.55% ~ 0.6%, Ti:0.1% ~ 0.15%, P≤0.08%, S≤0.03%, Mg:0.011% ~ 0.015%, all the other are Fe and inevitable impurity.
Carry out chemical composition analysis to the vermicular cast iron piston ring blank that step B obtains, the chemical composition in the piston ring obtained and weight percentage are:
C：3.6%，Si：2.6%，Mn：0.2%，Cr：0.2%，Mo：0.3%，Cu：0.55%，Ti：0.1%，P：0.08%，S：0.03%，Mg：0.015%。
The present embodiment passes through the chemical composition in adjustment material and uses rational casting production process, and the hardness of the vermicular cast iron piston ring produced is HRB106; Young's modulus is 156627N/mm
2; Thermostability is 95.3%; Bending strength is 1200N/mm
2; Tensile strength is 718N/mm
2.
Metallographic microstructure: graphite form is quasiflake graphite, its two-dimentional surface polishing observes the quasiflake graphite having 85% at least, and all the other are globular graphite; Matrix is tempered sorbite.
Embodiment 3
Processing condition in the present embodiment, manufacture method are identical with embodiment 1, are with the difference of embodiment 1:
Chemical composition in the present embodiment in vermicular cast iron piston ring and the design objective of weight percentage are:
C:3.7% ~ 3.8%, Si:2.7% ~ 2.8%, Mn:0.1% ~ 0.3%, Cr:0.2% ~ 0.3%, Mo:0.35% ~ 0.45%, Cu:0.65% ~ 0.7%, Ti:0.05% ~ 0.1%, P≤0.1%, S≤0.05%, Mg:0.011% ~ 0.015%, all the other are Fe and inevitable impurity.
Carry out chemical composition analysis to the vermicular cast iron piston ring blank that step B obtains, the chemical composition in the piston ring obtained and weight percentage are:
C：3.75%，Si：2.75%，Mn：0.15%，Cr：0.24%，Mo：0.4%，Cu：0.7%，Ti：0.05%，P：0.08%，S：0.05%，Mg：0.02%。
The present embodiment passes through the chemical composition in adjustment material and uses rational casting production process, and the hardness of the vermicular cast iron piston ring produced is HRB105; Young's modulus is 150455N/mm
2; Thermostability is 96.7%; Bending strength is 1150N/mm
2; Tensile strength is 725N/mm
2.
Metallographic microstructure: graphite form is quasiflake graphite, its two-dimentional surface polishing observes the quasiflake graphite having 80% at least, and all the other are globular graphite; Matrix is tempered sorbite.
Embodiment 4
Processing condition in the present embodiment, manufacture method are identical with embodiment 1, are with the difference of embodiment 1:
Chemical composition in the present embodiment in vermicular cast iron piston ring and the design objective of weight percentage are:
C:3.7% ~ 3.8%, Si:2.6% ~ 2.7%, Mn:0.1% ~ 0.3%, Cr:0.2% ~ 0.3%, Mo:0.25% ~ 0.3%, Cu:0.7% ~ 0.8%, Ti:0.1% ~ 0.15%, P≤0.1%, S≤0.03%, Mg:0.011% ~ 0.015%, all the other are Fe and inevitable impurity.
Carry out chemical composition analysis to the vermicular cast iron piston ring blank that step B obtains, the chemical composition in the piston ring obtained and weight percentage are:
C：3.77%，Si：2.68%，Mn：0.2%，Cr：0.24%，Mo：0.28%，Cu：0.8%，Ti：0.12%，P：0.09%，S：0.026%，Mg：0.012%。
The present embodiment passes through the chemical composition in adjustment material and uses rational casting production process, and the hardness of the vermicular cast iron piston ring produced is HRB105; Young's modulus is 146378N/mm
2; Thermostability is 97.3%; Bending strength is 1250N/mm
2; Tensile strength is 716N/mm
2.
Metallographic microstructure: graphite form is quasiflake graphite, its two-dimentional surface polishing observes the quasiflake graphite having 83% at least, and all the other are globular graphite; Matrix is tempered sorbite.
Embodiment 5
Processing condition in the present embodiment, manufacture method are identical with embodiment 1, are with the difference of embodiment 1:
Chemical composition in the present embodiment in vermicular cast iron piston ring and the design objective of weight percentage are:
C:3.7% ~ 3.8%, Si:2.7% ~ 2.8%, Mn:0.1% ~ 0.3%, Cr:0.2% ~ 0.3%, Mo:0.25% ~ 0.3%, Cu:0.6% ~ 0.65%, Ti:0.1% ~ 0.15%, P≤0.1%, S≤0.03%, Mg:0.011% ~ 0.015%, all the other are Fe and inevitable impurity.
Carry out chemical composition analysis to the vermicular cast iron piston ring blank that step B obtains, the chemical composition in the piston ring obtained and weight percentage are:
C：3.78%，Si：2.72%，Mn：0.15%，Cr：0.23%，Mo：0.27%，Cu：0.63%，Ti：0.13%，P：0.07%，S：0.025%，Mg：0.013%。
The present embodiment passes through the chemical composition in adjustment material and uses rational casting production process, and the hardness of the vermicular cast iron piston ring produced is HRB106; Young's modulus is 161581N/mm
2; Thermostability is 97.2%; Bending strength is 1200N/mm
2; Tensile strength is 709N/mm
2.
Metallographic microstructure: graphite form is quasiflake graphite, its two-dimentional surface polishing observes the quasiflake graphite having 85% at least, and all the other are globular graphite; Matrix is tempered sorbite.
Embodiment 6
Processing condition in the present embodiment, manufacture method are identical with embodiment 1, are with the difference of embodiment 1:
Chemical composition in the present embodiment in vermicular cast iron piston ring and the design objective of weight percentage are:
C:3.7% ~ 3.8%, Si:2.6% ~ 2.7%, Mn:0.1% ~ 0.3%, Cr:0.2% ~ 0.3%, Mo:0.25% ~ 0.3%, Cu:0.6% ~ 0.65%, Ti:0.05% ~ 0.1%, P≤0.1%, S≤0.03%, Mg:0.011% ~ 0.015%, all the other are Fe and inevitable impurity.
Carry out chemical composition analysis to the vermicular cast iron piston ring blank that step B obtains, the chemical composition in the piston ring obtained and weight percentage are:
C：3.72%，Si：2.69%，Mn：0.13%，Cr：0.24%，Mo：0.27%，Cu：0.61%，Ti：0.09%，P：0.08%，S：0.02%，Mg：0.014%。
The present embodiment passes through the chemical composition in adjustment material and uses rational casting production process, and the hardness of the vermicular cast iron piston ring produced is HRB105; Young's modulus is 159666N/mm
2; Thermostability is 96.8%; Bending strength is 1200N/mm
2; Tensile strength is 719N/mm
2.
Metallographic microstructure: graphite form is quasiflake graphite, its two-dimentional surface polishing observes the quasiflake graphite having 85% at least, and all the other are globular graphite; Matrix is tempered sorbite.
Embodiment 7
Processing condition in the present embodiment, manufacture method are identical with embodiment 1, are with the difference of embodiment 1:
Chemical composition in the present embodiment in vermicular cast iron piston ring and the design objective of weight percentage are:
C:3.8% ~ 3.85%, Si:2.7% ~ 2.8%, Mn:0.1% ~ 0.3%, Cr:0.2% ~ 0.3%, Mo:0.25% ~ 0.3%, Cu:0.6% ~ 0.65%, Ti:0.1% ~ 0.15%, P≤0.1%, S≤0.03%, Mg:0.011% ~ 0.015%, all the other are Fe and inevitable impurity.
Carry out chemical composition analysis to the vermicular cast iron piston ring blank that step B obtains, the chemical composition in the piston ring obtained and weight percentage are:
C：3.81%，Si：2.74%，Mn：0.14%，Cr：0.24%，Mo：0.28%，Cu：0.62%，Ti：0.11%，P：0.09%，S：0.03%，Mg：0.012%。
The present embodiment passes through the chemical composition in adjustment material and uses rational casting production process, and the hardness of the vermicular cast iron piston ring produced is HRB107; Young's modulus is 142389N/mm
2; Thermostability is 97.3%; Bending strength is 1250N/mm
2; Tensile strength is 705N/mm
2.
Metallographic microstructure: graphite form is quasiflake graphite, its two-dimentional surface polishing observes the quasiflake graphite having 80% at least, and all the other are globular graphite; Matrix is tempered sorbite.
Embodiment 8
Processing condition in the present embodiment, manufacture method are identical with embodiment 1, are with the difference of embodiment 1:
Chemical composition in the present embodiment in vermicular cast iron piston ring and the design objective of weight percentage are:
C:3.4% ~ 3.5%, Si:2.9% ~ 3.0%, Mn:0.1% ~ 0.3%, Cr:0.2% ~ 0.3%, Mo:0.25% ~ 0.3%, Cu:0.55% ~ 0.6%, Ti:0.1% ~ 0.15%, P≤0.1%, S≤0.03%, Mg:0.011% ~ 0.015%, all the other are Fe and inevitable impurity.
Carry out chemical composition analysis to the vermicular cast iron piston ring blank that step B obtains, the chemical composition in the piston ring obtained and weight percentage are:
C：3.4%，Si：3.0%，Mn：0.18%，Cr：0.2%，Mo：0.3%，Cu：0.55%，Ti：0.1%，P：0.075%，S：0.03%，Mg：0.015%。
The present embodiment passes through the chemical composition in adjustment material and uses rational casting production process, and the hardness of the vermicular cast iron piston ring produced is HRB105; Young's modulus is 156748N/mm
2; Thermostability is 95.4%; Bending strength is 1300N/mm
2; Tensile strength is 698N/mm
2.
Metallographic microstructure: graphite form is quasiflake graphite, its two-dimentional surface polishing observes the quasiflake graphite having 80% at least, and all the other are globular graphite; Matrix is tempered sorbite.
Embodiment 9
Processing condition in the present embodiment, manufacture method are identical with embodiment 1, are with the difference of embodiment 1:
Chemical composition in the present embodiment in vermicular cast iron piston ring and the design objective of weight percentage are:
C:3.9% ~ 4.0%, Si:2.4% ~ 2.5%, Mn:0.1% ~ 0.3%, Cr:0.3% ~ 0.4%, Mo:0.2% ~ 0.3%, Cu:0.5% ~ 0.6%, Ti:0.1% ~ 0.15%, P≤0.1%, S≤0.03%, Mg:0.011% ~ 0.015%, all the other are Fe and inevitable impurity.
Carry out chemical composition analysis to the vermicular cast iron piston ring blank that step B obtains, the chemical composition in the piston ring obtained and weight percentage are:
C：4.0%，Si：2.4%，Mn：0.3%，Cr：0.4%，Mo：0.2%，Cu：0.5%，Ti：0.15%，P：0.07%，S：0.03%，Mg：0.011%。
The present embodiment passes through the chemical composition in adjustment material and uses rational casting production process, and the hardness of the vermicular cast iron piston ring produced is HRB107; Young's modulus is 143209N/mm
2; Thermostability is 96.6%; Bending strength is 1300N/mm
2; Tensile strength is 706N/mm
2.
Metallographic microstructure: graphite form is quasiflake graphite, its two-dimentional surface polishing observes the quasiflake graphite having 80% at least, and all the other are globular graphite; Matrix is tempered sorbite.
The present invention is applicable to the piston ring casting that vermicular cast iron piston ring finished product ring height is 0.8mm ~ 8mm, internal diameter is 90mm ~ 300mm.
Claims (7)
1. a manufacture method for vermicular cast iron piston ring, is characterized in that: the chemical composition in described vermicular cast iron piston ring material and weight percentage are
C:3.6% ~ 3.8%, Si:2.6% ~ 2.8%, Mn:0.05% ~ 0.2%, Cr:0.2% ~ 0.3%, Mo:0.3% ~ 0.5%, Cu:0.55% ~ 0.7%, Ti:0.1% ~ 0.13%, P≤0.08%, S≤0.03%, Mg:0.011% ~ 0.015%, all the other are Fe and inevitable impurity;
The manufacture method of vermicular cast iron piston ring comprises the following steps:
A, folded case make sand mold;
B, by the starting material making vermicular cast iron piston ring by weight percentage composition proportioning put into electric furnace melting, be at the uniform velocity warming up to temperature of superheat and carry out Overheating Treatment, then leave standstill and make the melt temperature in electric furnace naturally cool to the tapping temperature of 1560 DEG C ~ 1600 DEG C;
Watering the pre-buried rare earth magnesium vermiculizer accounting for casting ladle volume 0.3% ~ 0.8% in pit at the bottom of handbag, pour the liquation reaching tapping temperature in electric furnace into casting ladle at twice, first time pours the liquation accounting for casting ladle 2/3 volume into, leaves standstill 1min ~ 2min afterwards, and second time pours the liquation accounting for casting ladle 1/3 volume into; Wherein pour in the process of liquation in second time and carry out twice current-following inoculation process with silicon strontium nucleating agent, add that total amount is casting ladle volume 0.4% ~ 0.8% of the nucleating agent of twice current-following inoculation process, after the temperature of the potting syrup in casting ladle is down to the teeming temperature of 1380 DEG C ~ 1440 DEG C, casting sand mould obtains blank;
After C, blank cool to room temperature, knockout separates sand mold and blank, carries out Shot Blasting to blank;
Carry out modifier treatment after D, rough turn blank, be then machined to size, and carry out surfaces nitrided process, pack warehouse-in after the assay was approved.
2. the manufacture method of vermicular cast iron piston ring according to claim 1, is characterized in that: adopt dedicated templates to make sand mold, the gating system that described dedicated templates comprises base plate (1) and is arranged on base plate (1) in steps A; Described gating system comprises the sprue (2) intersected vertically with base plate plane, and the cross gate (3) that be arranged on base plate in the middle part of crossing with sprue, base plate (1) arranges four piston ring models along the zygomorphy of cross gate (3), and described piston ring model is connected with cross gate (3) by ingate (4).
3. the manufacture method of vermicular cast iron piston ring according to claim 2, is characterized in that: described sprue (2) intersects vertically and is arranged on the center of cross gate (3).
4. the manufacture method of vermicular cast iron piston ring according to claim 1, is characterized in that: in step B, and the temperature of carrying out Overheating Treatment is 1580 DEG C ~ 1620 DEG C.
5. the manufacture method of vermicular cast iron piston ring according to claim 1, it is characterized in that: in step B when carrying out twice current-following inoculation process, the nucleating agent granularity added during first time inoculation is 3mm ~ 6mm, and the add-on of nucleating agent is 0.2% ~ 0.4% of casting ladle volume; The nucleating agent granularity added during second time inoculation is 1mm ~ 3mm, and the add-on of nucleating agent is 0.2% ~ 0.4% of casting ladle volume.
6. the manufacture method of vermicular cast iron piston ring according to claim 1, is characterized in that: in step B, potting syrup is when casting sand mould obtains blank, and potting syrup is poured within 3min.
7. the manufacture method of vermicular cast iron piston ring according to claim 1, is characterized in that: the modifier treatment of step D comprises first quenching, rear tempering two procedures, and wherein quenching temperature is 900 DEG C ~ 940 DEG C, oil cooling after insulation 2h; Tempering temperature is 520 DEG C ~ 560 DEG C, comes out of the stove air cooling to room temperature after insulation 2h.
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| CN111621693A (en) * | 2020-07-17 | 2020-09-04 | 四川赢信汇通实业有限公司 | Molybdenum-titanium alloy brake drum and preparation method thereof |
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