CN102115851B - Cast steel material for chain wheel of marine diesel engine and casting method of chain wheel - Google Patents

Cast steel material for chain wheel of marine diesel engine and casting method of chain wheel Download PDF

Info

Publication number
CN102115851B
CN102115851B CN 201010617170 CN201010617170A CN102115851B CN 102115851 B CN102115851 B CN 102115851B CN 201010617170 CN201010617170 CN 201010617170 CN 201010617170 A CN201010617170 A CN 201010617170A CN 102115851 B CN102115851 B CN 102115851B
Authority
CN
China
Prior art keywords
percent
sprocket wheel
equal
less
marine diesel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN 201010617170
Other languages
Chinese (zh)
Other versions
CN102115851A (en
Inventor
吴慕华
王雁冰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hudong Heavy Machinery Co Ltd
Original Assignee
Hudong Heavy Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hudong Heavy Machinery Co Ltd filed Critical Hudong Heavy Machinery Co Ltd
Priority to CN 201010617170 priority Critical patent/CN102115851B/en
Publication of CN102115851A publication Critical patent/CN102115851A/en
Application granted granted Critical
Publication of CN102115851B publication Critical patent/CN102115851B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The invention relates to a cast steel material for a chain wheel of a marine diesel engine. The cast steel material comprises the following chemical elements in percentage by mass: 0.18-0.21 percent of C, 0.85-1.00 percent of Mn, 0.35-0.55 percent of Si, less than or equal to 0.020 percent of S, less than or equal to 0.020 percent of P, less than or equal to 0.30 percent of Cr, less than or equal to 0.30 percent of Ni, less than or equal to 0.080 percent of Mo, less than or equal to 0.10 percent of V, less than or equal to 0.080 percent of Al, less than or equal to 0.060 percent of Nb, less than or equal to 0.40 percent of Cu and the balance of Fe element and other inevitable impurities. In the element proportion, the carbon equivalent that CEV is less than or equal to 0.39 percent is met, wherein CEV is calculated by a formula, namely CEV=C%+(Mn%)/6+(Cr%+Mo%+V%)/5+(Ni%+Cu%)/15. In a manufacturing method, raw materials of the chain wheel are reasonably selected and unconventional normalizing thermal treatment is performed, so that the yield of the mechanical property of the chain wheel is increased, the technical problems of low tooth surface hardness and uniformity are solved, the running reliability of the marine diesel engine is enhanced, and production cost is lowered.

Description

A kind of castmethod that is used for the cast steel material and the sprocket wheel of marine diesel sprocket wheel
Technical field
The present invention relates to marine diesel, particularly relate to the manufacturing materials and the castmethod of the sprocket wheel on the marine diesel.
Background technology
On marine diesel (being also referred to as main frame), the structure of sprocket wheel is as depicted in figs. 1 and 2, nearly two meters of its diameter, and weight reaches 6000kg, because build is huge, causes to be difficult in the casting hold, and occurs casting flaw easily.Above-mentioned cast steel sprocket wheel is used to drive the transmission of marine low speed diesel engine camshaft.Sprocket wheel is the very important moving parts of oil motor, is related to the reliability service of oil motor.It passes to camshaft with the portion of energy of crankshaft of diesel engine through the chain drive, thus the driving cam motion.Need bear periodic repeated stress during sprocket wheel work, vibrate corrosion big, that the acids medium is arranged.Bearing simultaneously under the abominable working conditions with the fierce friction of chain, thus selection want appropriate, material require high, mechanical property will meet the demands, hardness is wanted high and evenly, thereby guaranteed the operation of its reliable operation.
In the sprocket wheel manufacturing materials of prior art; Can there be casting flaw in sprocket after tending to take place the casting completion; Actually tend to adopt the way of repairing to make up; The result is because the material of repairing and there are differences with the sprocket wheel material, causes the position after the repairing can produce micro-crack, can be because tired and rupture during life-time service.If the sprocket fracture will have influence on the safe operation of main frame in the marine main engine working process.The sprocket wheel that prior art is produced also exists another one not enough, is exactly that Hardness Distribution is inhomogeneous, and it is serious to tend to that concentrated wear takes place, and also can have influence on the work-ing life of sprocket wheel.
Summary of the invention
The objective of the invention is to overcome the deficiency that exists in the prior art, provide a kind of novel cast steel material and casting technique to produce sprocket wheel.The sprocket wheel that utilizes cast steel material of the present invention and production technique to make requires sprocket intensity big, and intensity distribution is even.
In order to reach the foregoing invention purpose, technical scheme provided by the invention is following:
A kind of cast steel material that is used for the marine diesel sprocket wheel is characterized in that, this cast steel material comprises following composition:
Chemical element mass percent (%)
C 0.18~0.21
Mn 0.85~1.00
Si 0.35~0.55
S ≤0.020
P ≤0.020
Cr ≤0.30
Ni ≤0.30
Mo ≤0.080
V ≤0.10
Al ≤0.080
Nb ≤0.060
Cu ≤0.40
All the other are Fe element and other unavoidable impurities;
In the above-mentioned element proportioning, satisfy following carbon equivalent and require:
CEV≤0.39%, CEV calculates by following formula: CEV=C%+ (Mn%)/6+ (Cr%+Mo%+V%)/5+ (Ni%+Cu%)/15.
A kind of method of utilizing above-mentioned cast steel material casting marine diesel sprocket wheel is characterized in that this method comprises the steps:
1. melting meets the metallic solution of composition proportion, and keeping the preceding temperature of tapping is 1560 ℃~1600 ℃;
2. tap to steel teeming ladle, and in steel teeming ladle, feed the aluminium wire deoxidation, above-mentioned steel teeming ladle is warmed to 800 ℃~900 ℃ in advance, and storing time was greater than 30 minutes;
3. cast is preceding is controlled at 1510 ℃~1550 ℃ to the metallic solution thermometric in the steel teeming ladle with temperature, and the time of repose of steel teeming ladle will be above 8 minutes;
4. casting metal solution in the die cavity of the marine diesel sprocket wheel that completes accomplishes being no more than 18 minutes the duration of pouring from tapping to, and the molding sand that mold is used must be dried;
When 5. being poured into 1/3 height of open top, reduce pouring speed, in open top, add heat-generating agent simultaneously;
6. after the casting complete, on open top, add heat preserving agent, naturally cool to room temperature;
7. remove the molding sand and the chill of mo(U)ld face, with the cast gate and the rising head of flame cutting foundry goods, to foundry goods polishing polishing, priming is accordinged to drawing requirement roughing then then, and the monolateral surplus of staying is 4mm;
8. sprocket wheel is kept flat chassis chamber type electric resistance furnace internal heating, Heating temperature is 900 ± 10 ℃, and insulation was come out of the stove in 3 hours behind the samming;
9. with many gas blowers sprocket wheel is forced the blowing cooling after coming out of the stove; Treat that sprocket wheel is cooled to and advance stove below 300 ℃ again and carry out high tempering; The high tempering temperature is 580 ± 10 ℃; Insulation was come out of the stove air cooling to natural temperature after 6 hours behind the samming, checked hardness and mechanical property at last, and back precision work meets the requirements.
Based on technique scheme, cast steel material of the present invention and castmethod prior art in sprocket wheel production has following technological merit:
The first, cast steel material chemical ingredients of the present invention matches, and has especially controlled carbon and manganese element content range wherein, make the surface hardness of material and mechanical property improve greatly, and Hardness Distribution is even, meets the manufacturing of big minor sprocket.
The second, cast steel material of the present invention is in the castingprocesses of sprocket wheel, and except the carbon and manganese element content range of control material itself, forced air-cooling is adopted in the normalizing cooling, through improving speed of cooling, thereby has improved the strength of materials and surface hardness.
Description of drawings
Fig. 1 is the structural representation of facing of marine diesel upper sprocket wheel.
Fig. 2 is the side-looking structural representation of marine diesel upper sprocket wheel.
Embodiment
Below we combine concrete embodiment to come the manufacturing materials of the sprocket wheel on the marine diesel of the present invention and sprocket wheel castmethod done further to set forth in detail, in the hope of the more cheer and bright the present invention that understands, but can not limit protection scope of the present invention with this.
The cast steel material that is used for the marine diesel sprocket wheel among the present invention comprises that following one-tenth is grouped into:
Chemical element mass percent (%)
C 0.18~0.21
Mn 0.85~1.00
Si 0.35~0.55
S ≤0.020
P ≤0.020
Cr ≤0.30
Ni ≤0.30
Mo ≤0.080
V ≤0.10
Al ≤0.080
Nb ≤0.060
Cu ≤0.40
All the other are Fe element and other unavoidable impurities;
In the above-mentioned element proportioning, satisfy following carbon equivalent and require:
CEV≤0.39%, CEV calculates by following formula: CEV=C%+ (Mn%)/6+ (Cr%+Mo%+V%)/5+ (Ni%+Cu%)/15].
, casting need satisfy following mechanical property according to the mentioned component proportioning melting alloy liquation that comes out after accomplishing:
Adopt the method for above-mentioned cast steel material casting marine diesel sprocket wheel, this method comprises the steps:
1. melting meets the molten metal of composition proportion, and keeping the preceding temperature of tapping is 1560 ℃~1600 ℃;
2. tap to steel teeming ladle, and in steel teeming ladle, feed the aluminium wire deoxidation, above-mentioned steel teeming ladle is warmed to 800 ℃~900 ℃ in advance, and storing time was greater than 30 minutes;
3. cast is preceding is controlled at 1510 ℃~1550 ℃ to the molten metal thermometric in the steel teeming ladle with temperature, and the time of repose of steel teeming ladle will be above 8 minutes;
4. casting metal liquation in the die cavity of the marine diesel sprocket wheel that completes accomplishes being no more than 18 minutes the duration of pouring from tapping to, and the molding sand that mold is used must be dried;
When 5. being poured into 1/3 height of open top, reduce pouring speed, in open top, add heat-generating agent simultaneously;
6. after the casting complete, on open top, add heat preserving agent, naturally cool to room temperature;
7. remove the molding sand and the chill of mo(U)ld face, with the cast gate and the rising head of flame cutting foundry goods, to foundry goods polishing polishing, priming is accordinged to drawing requirement roughing then then, and the monolateral surplus of staying is 4mm;
8. sprocket wheel is kept flat chassis chamber type electric resistance furnace internal heating, Heating temperature is 900 ± 10 ℃, and insulation was come out of the stove in 3 hours behind the samming;
9. with many gas blowers sprocket wheel is forced the blowing cooling after coming out of the stove; Treat that sprocket wheel is cooled to and advance stove below 300 ℃ again and carry out high tempering; The high tempering temperature is 580 ± 10 ℃; Insulation was come out of the stove air cooling to natural temperature after 6 hours behind the samming, checked hardness and mechanical property at last, and back precision work meets the requirements.
Novel material of the present invention comes in the method for cast sprocket, and key is that the chemical ingredients of making steel will match, and especially the heat treated cooling of the scope of carbon and manganese element and normalizing must be adopted forced air-cooling.Characteristics of the present invention are through lot of test, if carbon is bad with manganese element control, and adopt the still air cooling of routine can cause mechanical property and tooth face hardness on the low side and undesirable.Through the content range (carbon is controlled at 0.18-0.21%, and manganese element is controlled at 0.85-1.00%) of control carbon and manganese, and the back employing gas blower pressure cooling of coming out of the stove, improve the speed of cooling of material, thereby improved the strength of materials and surface hardness.
Different carbon will produce different influences with surface hardness with the content of manganese to the mechanical property of sprocket wheel under different speed of cooling.Through to a large amount of comparisons tests of collocation of the different ratios of carbon and manganese element and the different performance that sprocket wheel had under different normalizing speed of cooling with analyze; On the basis of screening; Select to confirm the most suitable carbon and the manganese content range and the normalizing type of cooling; Accomplish both to keep the mechanical property of sprocket wheel and the requirement that surface hardness meets technical specifications, have uniform tooth face hardness again.This material and the performance that is after heat treatment had, empirical tests are identified, satisfy the requirement of the various type technical specificationss of state-of-the-art MDT brand marine diesel in the world today, guarantee that the marine diesel running is reliable, and obtain the praise of surveying society.
Owing to improve the mechanical property of cast steel sprocket wheel and the homogeneity of tooth face hardness and hardness, guaranteed that particularly the hinge wheel in the big cylinder diameter also meets the requirements, the chemical ingredients and the normalizing type of cooling of necessary precise quantification sprocket wheel make big minor sprocket can both reach requirement.
Marine diesel sprocket wheel method of manufacture of the present invention is through starting material and unconventional normalizing thermal treatment of choose reasonable sprocket wheel; Reach the qualification rate, the low and uneven technical problem of solution tooth face hardness that improve the sprocket wheel mechanical property; To improve the marine diesel reliability of operation, reduce production costs.

Claims (1)

1. a method of utilizing cast steel material casting marine diesel sprocket wheel is characterized in that this method comprises the steps: that 1. melting meets the molten metal of composition proportion, and keeping the preceding temperature of tapping is 1560 ℃~1600 ℃;
2. tap to steel teeming ladle, and in steel teeming ladle, feed the aluminium wire deoxidation, above-mentioned steel teeming ladle is warmed to 800 ℃~900 ℃ in advance, and storing time was greater than 30 minutes;
3. cast is preceding is controlled at 1510 ℃~1550 ℃ to the molten metal thermometric in the steel teeming ladle with temperature, and the time of repose of steel teeming ladle will be above 8 minutes;
4. casting metal liquation in the die cavity of the marine diesel sprocket wheel that completes accomplishes being no more than 18 minutes the duration of pouring from tapping to, and the molding sand that mold is used must be dried;
When 5. being poured into 1/3 height of open top, reduce pouring speed, in open top, add heat-generating agent simultaneously;
6. after the casting complete, on open top, add heat preserving agent, naturally cool to room temperature;
7. remove the molding sand and the chill of mo(U)ld face, with the cast gate and the rising head of flame cutting foundry goods, to foundry goods polishing polishing, priming is accordinged to drawing requirement roughing then then, and the monolateral surplus of staying is 4mm;
8. sprocket wheel is kept flat chassis chamber type electric resistance furnace internal heating, Heating temperature is 900 ± 10 ℃, and insulation was come out of the stove in 3 hours behind the samming;
9. with many gas blowers sprocket wheel is forced the blowing cooling after coming out of the stove; Treat that sprocket wheel is cooled to and advance stove below 300 ℃ again and carry out high tempering; The high tempering temperature is 580 ± 10 ℃; Insulation was come out of the stove air cooling to natural temperature after 6 hours behind the samming, checked hardness and mechanical property at last, and back precision work meets the requirements;
Described cast steel material comprises following composition:
All the other are ferro element and other unavoidable impurities;
In the above-mentioned element proportioning, satisfy following carbon equivalent and require:
CEV≤0.39%, CEV calculates by following formula: CEV=C%+ (Mn%)/6+ (Cr%+Mo%+V%)/5+ (Ni%+Cu%)/15.
CN 201010617170 2010-12-31 2010-12-31 Cast steel material for chain wheel of marine diesel engine and casting method of chain wheel Active CN102115851B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201010617170 CN102115851B (en) 2010-12-31 2010-12-31 Cast steel material for chain wheel of marine diesel engine and casting method of chain wheel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201010617170 CN102115851B (en) 2010-12-31 2010-12-31 Cast steel material for chain wheel of marine diesel engine and casting method of chain wheel

Publications (2)

Publication Number Publication Date
CN102115851A CN102115851A (en) 2011-07-06
CN102115851B true CN102115851B (en) 2012-12-05

Family

ID=44214773

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201010617170 Active CN102115851B (en) 2010-12-31 2010-12-31 Cast steel material for chain wheel of marine diesel engine and casting method of chain wheel

Country Status (1)

Country Link
CN (1) CN102115851B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109930089A (en) * 2017-12-17 2019-06-25 宜兴安纳西智能机械设备有限公司 A kind of battery conveying device sprocket wheel material
CN108220814A (en) * 2017-12-29 2018-06-29 重庆全茂合渝科技有限公司 A kind of preparation method of the automobile-used drive sprocket of motor
CN110814671A (en) * 2019-09-27 2020-02-21 长兴小浦铸钢有限公司 Chain wheel and manufacturing method thereof
CN111283151A (en) * 2020-03-18 2020-06-16 山西太钢不锈钢股份有限公司 Method for improving qualified rate of die casting flaw detection
CN111424222A (en) * 2020-04-10 2020-07-17 宝鸡石油机械有限责任公司 Steel casting for lifting system of ultra-deep well petroleum drilling machine and manufacturing method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1418978A (en) * 2001-11-14 2003-05-21 住友金属工业株式会社 Anti-fatigue crack fine expansivity steel material and method for making same
CN102094155A (en) * 2010-12-31 2011-06-15 沪东重机有限公司 Cast steel material for chain wheel of marine diesel engine and smelting method thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09125136A (en) * 1995-11-02 1997-05-13 Nippon Steel Corp Production of steel for pressure vessel excellent in sohic resistance

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1418978A (en) * 2001-11-14 2003-05-21 住友金属工业株式会社 Anti-fatigue crack fine expansivity steel material and method for making same
CN102094155A (en) * 2010-12-31 2011-06-15 沪东重机有限公司 Cast steel material for chain wheel of marine diesel engine and smelting method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP特开平9-125136A 1997.05.13

Also Published As

Publication number Publication date
CN102115851A (en) 2011-07-06

Similar Documents

Publication Publication Date Title
CN102115851B (en) Cast steel material for chain wheel of marine diesel engine and casting method of chain wheel
CN102837165B (en) Manufacturing method for final-stage driving gear of high-power coal mining machine
CN102094155A (en) Cast steel material for chain wheel of marine diesel engine and smelting method thereof
CN102286712B (en) Process for enhancing thermal fatigue performance of aluminum-silicon alloy
CN104532154A (en) High-hardness high-polishing pre-hardening plastic die steel and manufacture technology thereof
CN102329943B (en) Thermal treatment method for large electroslag smelting cast 42CrMo steel crankshaft
JP5469681B2 (en) Steel composition for manufacturing piston rings and cylinder sleeves
CN105132796B (en) Middle silicon molybdenum alloy vermicular cast iron glass mold material and preparation method thereof
CN101709428A (en) Compound microalloy hot die steel with high heat resistance and preparation method thereof
CN101381844A (en) Cold working die steel material and production technology thereof
CN1317417C (en) Alloy gray iron material for vehicle covering mould and its preparation method
KR20040066923A (en) Gray cast iron for cylinder heads
CN106350729A (en) Burr type cylinder liner poduction method
CN101451214B (en) Large thickness novel anti-hydrogen sulfide steel and method for producing the same
CN103045932A (en) Ductile cast iron grinding ball with high wear resistance and high impact toughness and production technology thereof
CN1313633C (en) Hard hollow alloy ball iron mould material for vehicle mould and its making method
CN108746508A (en) A kind of production technology of more alloy cylinder caps
JP5465258B2 (en) Steel composition for manufacturing piston rings and cylinder sleeves
CN109468523B (en) Heat treatment process of rare earth alloy cast iron glass mold material
CN1138017C (en) Middle-alloy chromium series hot die steel
CN103343290A (en) High-manganese steel and preparation method thereof
RU2448184C2 (en) Wear-resistant cast iron
CN103233170A (en) Steel for hot working mold and production method thereof
CN103667859A (en) Multi-component low-melting-point fine-grain non-net medium-chromium cast iron and preparation method thereof
CN101560633A (en) Technical method for producing heat-resisting alloy steel casting below 1000 DEG C

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model