CN108588543A - A kind of centrifugal casting method of engine cylinder linder - Google Patents
A kind of centrifugal casting method of engine cylinder linder Download PDFInfo
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- CN108588543A CN108588543A CN201810566937.3A CN201810566937A CN108588543A CN 108588543 A CN108588543 A CN 108588543A CN 201810566937 A CN201810566937 A CN 201810566937A CN 108588543 A CN108588543 A CN 108588543A
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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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
- C22C33/04—Making ferrous alloys by melting
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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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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a kind of centrifugal casting method of engine cylinder linder, including alloy material preparation and melting, spheroidization and inoculation material prepares, spheroidization and inoculation material dress packet, spheroidization and inoculation processing, five steps of casting-centrifugate, wherein alloy material includes carbon content 2.9%~4.0%, sulfur content 0.03%~0.08%, silicone content 1.9%~3.1%, phosphorus content 0~0.4%, manganese content 0.1%~0.35%, chromium content 0~0.5%, nickel content 0.3%~0.8%, Ti content 0~0.02%, copper content 0.5%~0.7%, rhenium content 0~0.03%, Theil indices 0~0.2%, molybdenum content 0.01%~0.03%, tungsten 0.01%~0.03%, surplus is iron.Cylinder jacket prepared by the method for the present invention has good mechanical performance in intensity, toughness and wearability far above various alloy cast iron materials.
Description
Technical field
The present invention relates to centrifugal casting field, especially a kind of centrifugal casting method of engine cylinder linder.
Background technology
All-aluminium engine has many advantages, such as light-weight, perfect heat-dissipating, in industry by wide popularization and application, still
Its mechanical performance, wear-resisting property, thermal stability etc. are not so good as cast iron.For this purpose, adding cast iron bushing using aluminum cylinder in industry at present
Mode solves the problems, such as this.
The bushing also known as cylinder jacket of cast iron applied to aluminum cylinder, cylinder jacket is under high temperature, high speed and high-pressure environment
Work, thus, it is desirable that it is steady with higher room elevated temperature strength, good wear-resisting property and high institutional framework that it prepares material
It is qualitative.In recent years, energy-saving and emission-reduction Economic Development Mode requires cylinder sleeve of engine temperature in use to improve, own wt mitigates as possible,
Service life increases, for this purpose, widely preparing cylinder sleeve using high performance alloys cast iron quality.In order to improve cylinder sleeve operating temperature,
Engine dry weight is reduced, engine life is improved, reduces exhaust gas discharge, especially on heavy type delivery locomotive, for engine
The inner surface institutional framework of cylinder jacket material requires more stringent.
Currently, being provided in China's professional standard, selected generally in distance for the metallographic detection position of centrifugal cast cylinder sleeve
Within nearly working face 2mm ranges, and the organism optical metallographic testing requirements of the cylinder sleeve are significantly larger than industry requirement：It is required whole
Tissue on a cylinder sleeve section should all meet the requirements.Therefore, using conventional centrifugal casting technique, due to centrifugal casting process melt
The effect of consecutive solidification mode and centrifugal force, although the tensile strength and hardness of the cylinder jacket material of preparation can meet product mechanical property
Can require, still, alloy cylinder jacket after used a period of time, bore wear aggravation, between casing wall and piston ring generate compared with
Big gap, causes engine to become flat, and effective power reduces, and Oil Consumption significantly rises, and service life of aeroengine reduces.Cause
This, research and development improve interior surface of cylinder liner institutional framework, obtain the aluminium alloy cylinder with more high-wear resistance, more low abrasion coefficient
Set is particularly important.
Invention content
Present invention seek to address that above-mentioned technical problem.For this purpose, the present invention proposes a kind of centrifugal casting method of engine cylinder linder,
This method can effectively improve the wear-resisting property of cylinder jacket and reduce the coefficient of waste of cylinder jacket.
The technical solution adopted by the present invention is：A kind of centrifugal casting method of engine cylinder linder, specifically includes following steps：
A. alloy material preparation and melting：It weighs each raw material, controls carbon content 2.9%~4.0%, sulfur content 0.03%~
0.08%, silicone content 1.9%~3.1%, phosphorus content 0~0.4%, manganese content 0.1%~0.35%, chromium content 0~0.5%,
Nickel content 0.3%~0.8%, Ti content 0~0.02%, copper content 0.5%~0.7%, rhenium content 0~0.03%, Theil indices 0
~0.2%, molybdenum content 0.01%~0.03%, tungsten 0.01%~0.03%, surplus is iron, then molten using medium-frequency induction furnace
Each raw material is refined, control molten iron tapping temperature is 1650 DEG C~1700 DEG C；
B. spheroidization and inoculation material prepares：The total amount of required nodulizer and inovulant is determined according to molten iron total amount, and to nodularization
Processing is dried with inovulant in agent；
C. spheroidization and inoculation material dress packet：Nodulizer, part inovulant, coverture are sequentially placed into packet；
D. spheroidization and inoculation is handled：Partial molten iron is poured into packet rapidly, is added when spheroidizing reacion draws to an end remaining pregnant
Agent and remaining molten iron are educated, treated, and molten iron temperature is 1550 DEG C~1650 DEG C；
E. casting-centrifugate：Start centrifugal casting machine, molten iron is poured into cast pipe die, centrifugal forming postcooling to obtain the final product
To cylinder jacket.
As a further improvement of the above technical scheme, the nodulizer is QRMg8RE3 (JB/T9228-1999), described
Rare earth element yttrium, cerium and scandium are mixed in nodulizer.
As a further improvement of the above technical scheme, by weight, each rare earth element accounts for the percentage of nodulizer total amount
For：Yttrium：0.05%~0.08%, cerium：0.01%~0.03%, scandium：0.07%~0.1%.
As a further improvement of the above technical scheme, in step c, the bottom of packet is equipped with dam configuration, nodulizer, part
Inovulant, coverture are laid on one end of dam configuration successively, and in step d, molten iron is poured into from the other end of dam configuration in packet.
As a further improvement of the above technical scheme, iron filings layer, iron filings are equipped between part inovulant and coverture
The iron filings granularity of layer is 1~3mm.
As a further improvement of the above technical scheme, in step e, cast pipe die is preheated before starting centrifugal casting machine extremely
350 DEG C~450 DEG C.
As a further improvement of the above technical scheme, in step e, start centrifugal casting machine to rotating speed and reach 550~650
Rev/min, be then poured into the molten iron of total amount half, adjusted after centrifugal forming centrifugal casting machine to rotating speed reach 800~1000 turns/
Point, it is subsequently poured into remaining half molten iron.
As a further improvement of the above technical scheme, in step e, the cooling cooling water using fixed constant pressure and flow
Carry out water cooling.
As a further improvement of the above technical scheme, this method further includes step f, quenching：Cylinder jacket is heated to 830
DEG C~860 DEG C, keep the temperature 1.5~2 hours so that cylinder jacket tissue complete austenitizing, subsequent austempering temperature control is 285
~315 DEG C, 20~30 minutes are kept the temperature, is then taken out air-cooled.
As a further improvement of the above technical scheme, this method further includes step e, tempering：Cylinder jacket is being heat-treated
It is tempered in stove, temperature is 500 DEG C~600 DEG C, 1.5~2 hours is kept the temperature, then with 40~120 DEG C/h of coolings.
The beneficial effects of the invention are as follows：Using medium-frequency induction furnace melt iron, medium-frequency induction furnace is easy to adjust molten iron
Ingredient controls molten iron temperature, can provide high-quality molten iron for the production of cylinder jacket, solve cupola melting molten iron substantially and study
Divide the uneven problem low with tapping temperature, while the present invention passes through selected alloying component, cooperation on the basis of many experiments
Rational technological design so that prepared cylinder jacket is far above various alloy cast iron materials in intensity, toughness and wearability, high
In bainite gray cast iron and common Nodular cast iron material so that cylinder jacket has better mechanical performance.
Specific implementation mode
A kind of centrifugal casting method of engine cylinder linder, specifically includes following steps：
A. alloy material preparation and melting：It weighs each raw material, controls carbon content 2.9%~4.0%, sulfur content 0.03%~
0.08%, silicone content 1.9%~3.1%, phosphorus content 0~0.4%, manganese content 0.1%~0.35%, chromium content 0~0.5%,
Nickel content 0.3%~0.8%, Ti content 0~0.02%, copper content 0.5%~0.7%, rhenium content 0~0.03%, Theil indices 0
~0.2%, molybdenum content 0.01%~0.03%, tungsten 0.01%~0.03%, surplus is iron, then molten using medium-frequency induction furnace
Each raw material is refined, control molten iron tapping temperature is 1650 DEG C~1700 DEG C；
B. spheroidization and inoculation material prepares：The total amount of required nodulizer and inovulant is determined according to molten iron total amount, and to nodularization
Processing is dried with inovulant in agent；
C. spheroidization and inoculation material dress packet：Nodulizer, part inovulant, coverture are sequentially placed into packet；
D. spheroidization and inoculation is handled：Partial molten iron is poured into packet rapidly, is added when spheroidizing reacion draws to an end remaining pregnant
Agent and remaining molten iron are educated, treated, and molten iron temperature is 1550 DEG C~1650 DEG C；
E. casting-centrifugate：Start centrifugal casting machine, molten iron is poured into cast pipe die, centrifugal forming postcooling to obtain the final product
To cylinder jacket.
Using medium-frequency induction furnace melt iron, medium-frequency induction furnace is easy to adjust hot metal composition, controls molten iron temperature, can
High-quality molten iron is provided for the production of cylinder jacket, cupola melting molten iron uneven chemical components is solved substantially and tapping temperature is low
The problem of, while the present invention, by selected alloying component, coordinates rational technological design on the basis of many experiments so that
Prepared cylinder jacket is far above various alloy cast iron materials in intensity, toughness and wearability, higher than bainite gray cast iron and general
Logical Nodular cast iron material so that cylinder jacket has better mechanical performance.
The effect of each chemical composition of cylinder jacket made of the method for the present invention is as follows：
1) carbon is graphitization formation element, has stable austenite, hinders the effect of bainite transformation, and carbon height can in magnesium iron
Hinder the precipitation of cementite；
2) sulphur can effectively increase gray iron eutectic colony number and thin-wall ductile iron casting ball number, but excessive sulphur can cause
Casting generates brittleness, causes surface defect and slag defect, therefore sulfur content control below 0.08%；
3) silicon can promote to be graphitized in magnesium iron, and as silicon amount increases, graphite sphere diameter is tiny, and ferrite content increases, from
And the mechanical performance of magnesium iron is improved, silicon itself is negative segregation element, has invigoration effect to matrix, can inhibit carbon in isothermal hardening
The formation of compound；
4) phosphorus is easy to be segregated, and general phosphorus content just will appear 2~3% iron phosphide eutectic close to 0.1%, and phosphorus is to isothermal magnesium iron
There is apparent embrittling effect；
5) manganese be easy to segregation element, be often largely enriched in crystal boundary, make eutectic cell boundary occur free cementite and
Martensite, severe exacerbation mechanical performance, generally manganese control below 0.5%；
6) for chromium in Solidification of Cast Iron, chromium facilitates the effect of cementite very strong, and the chilling tendency of cast iron is made to enhance；
7) nickel can be with its tensile strength of slight decrease, but can significantly improve plasticity and toughness, the appropriate content for increasing nickel
The hardenability of casting can be improved；
8) titanium can effectively enhance the toughness and mechanical performance of cylinder sleeve cast part；
9) formation of carbide when copper can effectively inhibit isothermal transformation, so austempering ductile iron can be significantly improved
Plasticity and toughness, the appropriate content for increasing copper can improve the hardenability of casting；
10) rhenium can significantly improve, improve the performance of alloy cast iron；
11) tin is molten with liquid iron and ferrite, promotes graphitization during eutectic, reduces austenite transformation temperature, expands difficult to understand
The areas Shi Ti can refine and increase pearlite；
12) molybdenum is a kind of element with very strong quenching degree.The transformation that can hinder pearlite, without hindering needle-shaped iron element
The transformation of body has opposite segregated manner with nickel, therefore not generating can make under conditions of bulk intergranular carbide matrix micro- hard
Degree reaches relatively good balance.
13) tungsten is stable carbide formers, promotes the tool stability and wearability of casting.
It is further preferred that nodulizer is QRMg8RE3 (JB/T9228-1999), rare earth element is mixed in nodulizer
Yttrium, cerium and scandium.By weight, the percentage that each rare earth element accounts for nodulizer total amount is：Yttrium：0.05%~0.08%, cerium：
0.01%~0.03%, scandium：0.07%~0.1%.There is boiling point as nodulizer 1 using thulium yttrium, cerium, scandium
Height can inhibit the advantages of tension-active element interference effect.
It is further preferred that in step c, the bottom of packet is equipped with dam configuration, nodulizer, part inovulant, coverture according to
Secondary one end for being laid on dam configuration, in step d, molten iron is poured into from the other end of dam configuration in packet, to prevent from falling into packet
When entering molten iron, molten iron directly impacts the materials such as nodulizer, to influence the absorption of molten iron team nodulizer.
It is further preferred that be equipped with iron filings layer between part inovulant and coverture, the iron filings granularity of iron filings layer is 1~
3mm, iron filings layer can be effectively prevented molten iron nodulizer when pouring into packet and detonate.
It is further preferred that in step e, cast pipe die is preheated before starting centrifugal casting machine to 350 DEG C~450 DEG C.
It is further preferred that in step e, start centrifugal casting machine to rotating speed and reach 550~650 revs/min, is then poured into total
The molten iron of half is measured, adjusting centrifugal casting machine to rotating speed after centrifugal forming reaches 800~1000 revs/min, is subsequently poured into remaining
Half molten iron.
It is further preferred that in step e, the cooling cooling water using fixed constant pressure and flow carries out water cooling.Using fixed permanent
It presses the cooling water of constant current to carry out water cooling, passes through the pressure and stream of the control cooling water that water-cooled valve and special water cooled pipeline are stablized
Amount makes casting uniformly radially radiate along centrifugal casting forging piece, ensure that the cooling velocity of casting, the cooling condition of entire casting is more
Add uniform and stable, is conducive to the control of casting metallographic structure, and the use of raw material can be reduced, it is cost-effective.
It is further preferred that this method further includes step f, quenching：Cylinder jacket is heated to 830 DEG C~860 DEG C, heat preservation
1.5~2 hours so that cylinder jacket tissue complete austenitizing, subsequent austempering temperature control is at 285~315 DEG C, heat preservation 20
It~30 minutes, then takes out air-cooled.
It is further preferred that this method further includes step e, tempering：Cylinder jacket is tempered in heat-treatment furnace, temperature
It is 500 DEG C~600 DEG C, 1.5~2 hours is kept the temperature, then with 40~120 DEG C/h of coolings.
With specific embodiment, the present invention will be described below, and following embodiments are all made of above-mentioned centre spinning method：
Embodiment one
Dispensing is carried out by 1 chemical percents of table：
Table 1
| Element | Carbon | Sulphur | Phosphorus | Silicon | Manganese | Chromium | Nickel |
| Content % | 2.9 | 0.03 | 0 | 1.9 | 0.1 | 0 | 0.3 |
| Element | Tin | Tungsten | Copper | Titanium | Rhenium | Molybdenum | Iron |
| Content % | 0 | 0.01 | 0.5 | 0 | 0 | 0.01 | Surplus |
The composition proportion of nodulizer is as shown in table 2：
Table 2
| Element | Yttrium | Cerium | Scandium | QRMg8RE3 |
| Content % | 0.05 | 0.01 | 0.07 | Surplus |
Smelting equipment is medium-frequency induction furnace, and molten iron tapping temperature is：1650℃；Partial molten iron is poured into and is placed with nodularization
Agent, part inovulant, iron filings layer, coverture packet in, the content of which part molten iron is the half of molten iron total amount, and nodulizer is adopted
With QRMg8RE3 (JB/T9228-1999) and be mixed into rare earth element, the content of part inovulant be inovulant total amount three/
Two, the iron filings granularity of iron filings layer is 1mm；Remaining inovulant and remaining molten iron are added when spheroidizing reacion draws to an end；At nodularization
Molten iron temperature is after reason：1550℃.
Preheating cast pipe die starts centrifugal casting machine to rotating speed and reaches 550 revs/min, be then poured into total amount half to 350 DEG C
Molten iron, centrifugal casting machine to rotating speed is adjusted after centrifugal forming and reaches 800 revs/min, pours into remaining molten iron, centrifugal forming postcooling
Obtain liner blank.
Liner blank is heated to 830 DEG C, keeps the temperature 1.5 hours so that liner blank tissue complete austenitizing, with
At 285 DEG C, heat preservation is air-cooled after twenty minutes for austempering temperature control afterwards；Liner blank is tempered in heat-treatment furnace, is tempered
Temperature is 500 DEG C, 1.5 hours is kept the temperature, then with 40 DEG C/h of coolings.The tensile strength of final gained cylinder jacket is 930MPa,
Case hardness is 367HB, and wear-resisting property promotes 31%.
Embodiment two
Dispensing is carried out by 3 chemical percents of table：
Table 3
| Element | Carbon | Sulphur | Phosphorus | Silicon | Manganese | Chromium | Nickel |
| Content % | 3.5 | 0.05 | 0.2 | 2.0 | 0.25 | 0.25 | 0.5 |
| Element | Tin | Tungsten | Copper | Titanium | Rhenium | Molybdenum | Iron |
| Content % | 0.1 | 0.02 | 0.6 | 0.01 | 0.01 | 0.02 | Surplus |
The composition proportion of nodulizer is as shown in table 4：
Table 4
| Element | Yttrium | Cerium | Scandium | QRMg8RE3 |
| Content % | 0.06 | 0.02 | 0.08 | Surplus |
Smelting equipment is medium-frequency induction furnace, and molten iron tapping temperature is：1680℃；Partial molten iron is poured into and is placed with nodularization
Agent, part inovulant, iron filings layer, coverture packet in, the content of which part molten iron is the half of molten iron total amount, and nodulizer is adopted
With QRMg8RE3 (JB/T9228-1999) and be mixed into rare earth element, the content of part inovulant be inovulant total amount three/
Two, the iron filings granularity of iron filings layer is 2mm；Remaining inovulant and remaining molten iron are added when spheroidizing reacion draws to an end；At nodularization
Molten iron temperature is after reason：1600℃.
Preheating cast pipe die starts centrifugal casting machine to rotating speed and reaches 600 revs/min, be then poured into total amount half to 400 DEG C
Molten iron, centrifugal casting machine to rotating speed is adjusted after centrifugal forming and reaches 900 revs/min, pours into remaining molten iron, centrifugal forming postcooling
Obtain liner blank.
Liner blank is heated to 845 DEG C, keeps the temperature 1.8 hours so that liner blank tissue complete austenitizing, with
Austempering temperature control is air-cooled after keeping the temperature 25 minutes at 300 DEG C afterwards；Liner blank is tempered in heat-treatment furnace, is tempered
Temperature is 550 DEG C, 1.8 hours is kept the temperature, then with 80 DEG C/h of coolings.The tensile strength of final gained cylinder jacket is 941MPa,
Case hardness is 373HB, and wear-resisting property promotes 36%.
Embodiment three
Dispensing is carried out by 5 chemical percents of table：
Table 5
| Element | Carbon | Sulphur | Phosphorus | Silicon | Manganese | Chromium | Nickel |
| Content % | 4.0 | 0.08 | 0.4 | 3.1 | 0.35 | 0.5 | 0.8 |
| Element | Tin | Tungsten | Copper | Titanium | Rhenium | Molybdenum | Iron |
| Content % | 0.2 | 0.03 | 0.7 | 0.02 | 0.03 | 0.03 | Surplus |
The composition proportion of nodulizer is as shown in table 6：
Table 6
| Element | Yttrium | Cerium | Scandium | QRMg8RE3 |
| Content % | 0.08 | 0.03 | 0.1 | Surplus |
Smelting equipment is medium-frequency induction furnace, and molten iron tapping temperature is：1700℃；Partial molten iron is poured into and is placed with nodularization
Agent, part inovulant, iron filings layer, coverture packet in, the content of which part molten iron is the half of molten iron total amount, and nodulizer is adopted
With QRMg8RE3 (JB/T9228-1999) and be mixed into rare earth element, the content of part inovulant be inovulant total amount three/
Two, the iron filings granularity of iron filings layer is 3mm；Remaining inovulant and remaining molten iron are added when spheroidizing reacion draws to an end；At nodularization
Molten iron temperature is after reason：1650℃.
Preheating cast pipe die starts centrifugal casting machine to rotating speed and reaches 650 revs/min, be then poured into total amount half to 450 DEG C
Molten iron, centrifugal casting machine to rotating speed is adjusted after centrifugal forming and reaches 1000 revs/min, pours into remaining molten iron, it is cold after centrifugal forming
But liner blank is obtained.Liner blank is heated to 860 DEG C, keeps the temperature 2 hours so that the complete Ovshinsky of liner blank tissue
Body, subsequent austempering temperature control are air-cooled after keeping the temperature 30 minutes at 315 DEG C；Liner blank is returned in heat-treatment furnace
Fire, temperature are 600 DEG C, 2 hours are kept the temperature, then with 120 DEG C/h of coolings.Finally the tensile strength of gained cylinder jacket is
919MPa, case hardness 352HB, wear-resisting property promote 27%.
Applicant states that the present invention illustrates detailed process equipment and the technological process of the present invention by above-described embodiment,
But the invention is not limited in above-mentioned detailed process equipment and technological processes, that is, it is above-mentioned detailed not mean that the present invention has to rely on
Process equipment and technological process could be implemented.Person of ordinary skill in the field it will be clearly understood that any improvement in the present invention,
The addition of equivalence replacement and auxiliary element to each raw material of product of the present invention, the selection etc. of concrete mode all fall within the present invention's
Within protection domain and the open scope.
Claims (10)
1. a kind of centrifugal casting method of engine cylinder linder, which is characterized in that specifically include following steps：
A. alloy material preparation and melting：It weighs each raw material, controls carbon content 2.9%~4.0%, sulfur content 0.03%~
0.08%, silicone content 1.9%~3.1%, phosphorus content 0~0.4%, manganese content 0.1%~0.35%, chromium content 0~0.5%,
Nickel content 0.3%~0.8%, Ti content 0~0.02%, copper content 0.5%~0.7%, rhenium content 0~0.03%, Theil indices 0
~0.2%, molybdenum content 0.01%~0.03%, tungsten 0.01%~0.03%, surplus is iron, then molten using medium-frequency induction furnace
Each raw material is refined, control molten iron tapping temperature is 1650 DEG C~1700 DEG C；
B. spheroidization and inoculation material prepares：According to molten iron total amount determine needed for nodulizer and inovulant total amount, and to nodulizer with
Processing is dried in inovulant；
C. spheroidization and inoculation material dress packet：Nodulizer, part inovulant, coverture are sequentially placed into packet；
D. spheroidization and inoculation is handled：Partial molten iron is poured into packet rapidly, remaining inovulant is added when spheroidizing reacion draws to an end
With remaining molten iron, treated, and molten iron temperature is 1550 DEG C~1650 DEG C；
E. casting-centrifugate：Start centrifugal casting machine, molten iron is poured into cast pipe die, centrifugal forming postcooling obtains gas
Cylinder sleeve.
2. centrifugal casting method of engine cylinder linder according to claim 1, it is characterised in that：The nodulizer is QRMg8RE3
(JB/T9228-1999), rare earth element yttrium, cerium and scandium are mixed in the nodulizer.
3. centrifugal casting method of engine cylinder linder according to claim 2, it is characterised in that：By weight, each rare earth element
The percentage for accounting for nodulizer total amount is：Yttrium：0.05%~0.08%, cerium：0.01%~0.03%, scandium：0.07%~0.1%.
4. according to claims 1 or 2 or 3 centrifugal casting method of engine cylinder linder, it is characterised in that：In step c, the bottom of packet
Portion is equipped with dam configuration, and nodulizer, part inovulant, coverture are laid on one end of dam configuration successively, in step d, molten iron
It is poured into packet from the other end of dam configuration.
5. centrifugal casting method of engine cylinder linder according to claim 4, it is characterised in that：Part inovulant and coverture it
Between be equipped with iron filings layer, the iron filings granularity of iron filings layer is 1~3mm.
6. according to claims 1 or 2 or 3 centrifugal casting method of engine cylinder linder, it is characterised in that：In step e, start from
Cast pipe die is preheated before heart casting machine to 350 DEG C~450 DEG C.
7. according to claims 1 or 2 or 3 centrifugal casting method of engine cylinder linder, it is characterised in that：In step e, start from
Heart casting machine to rotating speed reaches 550~650 revs/min, is then poured into the molten iron of total amount half, centrifugal casting is adjusted after centrifugal forming
Machine to rotating speed reaches 800~1000 revs/min, is subsequently poured into remaining half molten iron.
8. according to claims 1 or 2 or 3 centrifugal casting method of engine cylinder linder, it is characterised in that：It is described cold in step e
But water cooling is carried out using the cooling water of fixed constant pressure and flow.
9. according to claims 1 or 2 or 3 centrifugal casting method of engine cylinder linder, it is characterised in that：Further include step f, quenches
Fire：Cylinder jacket is heated to 830 DEG C~860 DEG C, keeps the temperature 1.5~2 hours so that cylinder jacket tissue complete austenitizing, then
Austempering temperature is controlled at 285~315 DEG C, is kept the temperature 20~30 minutes, is then taken out air-cooled.
10. centrifugal casting method of engine cylinder linder according to claim 9, it is characterised in that：Further include step e, tempering：It will
Cylinder jacket is tempered in heat-treatment furnace, temperature be 500 DEG C~600 DEG C, keep the temperature 1.5~2 hours, then with 40~120 DEG C/
Hour is cooling.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109404154A (en) * | 2018-11-23 | 2019-03-01 | 沪东重机有限公司 | Cylinder jacket, the preparation process of cylinder jacket and the engine using the cylinder jacket |
| CN111850382A (en) * | 2020-06-05 | 2020-10-30 | 苏州东亚机械铸造有限公司 | High-strength high-temperature-resistant nodular cast iron and preparation method thereof |
| CN112609054A (en) * | 2020-11-09 | 2021-04-06 | 广西玉柴机器股份有限公司 | Technological method of fatigue-resistant cylinder cover |
| CN113736974A (en) * | 2021-07-28 | 2021-12-03 | 安庆帝伯格茨缸套有限公司 | Preparation process of high-strength isothermal bainite diesel engine cylinder sleeve |
| CN113774268A (en) * | 2021-08-09 | 2021-12-10 | 江苏爱吉斯海珠机械有限公司 | Nodular cast iron for cylinder liner and preparation method thereof |
| CN113802049A (en) * | 2020-06-16 | 2021-12-17 | 美利林科技有限公司 | CADI (computer aided design) grinding ball casting process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109404154A (en) * | 2018-11-23 | 2019-03-01 | 沪东重机有限公司 | Cylinder jacket, the preparation process of cylinder jacket and the engine using the cylinder jacket |
| CN111850382A (en) * | 2020-06-05 | 2020-10-30 | 苏州东亚机械铸造有限公司 | High-strength high-temperature-resistant nodular cast iron and preparation method thereof |
| CN113802049A (en) * | 2020-06-16 | 2021-12-17 | 美利林科技有限公司 | CADI (computer aided design) grinding ball casting process |
| CN112609054A (en) * | 2020-11-09 | 2021-04-06 | 广西玉柴机器股份有限公司 | Technological method of fatigue-resistant cylinder cover |
| CN113736974A (en) * | 2021-07-28 | 2021-12-03 | 安庆帝伯格茨缸套有限公司 | Preparation process of high-strength isothermal bainite diesel engine cylinder sleeve |
| CN113736974B (en) * | 2021-07-28 | 2022-12-09 | 安庆帝伯格茨缸套有限公司 | Preparation process of high-strength isothermal bainite diesel engine cylinder sleeve |
| CN113774268A (en) * | 2021-08-09 | 2021-12-10 | 江苏爱吉斯海珠机械有限公司 | Nodular cast iron for cylinder liner and preparation method thereof |
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