CN104480377A - Vermicular graphite cast iron single cylinder diesel engine body with high vermicular graphite rate and preparation method thereof - Google Patents
Vermicular graphite cast iron single cylinder diesel engine body with high vermicular graphite rate and preparation method thereof Download PDFInfo
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- CN104480377A CN104480377A CN201410777359.XA CN201410777359A CN104480377A CN 104480377 A CN104480377 A CN 104480377A CN 201410777359 A CN201410777359 A CN 201410777359A CN 104480377 A CN104480377 A CN 104480377A
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Abstract
The invention relates to a single cylinder diesel engine body and particularly relates to a vermicular graphite cast iron single cylinder diesel engine body with high vermicular graphite rate. The single cylinder diesel engine body comprises the following chemical components in percentage by mass: 3.5-3.8% of C, 2.1-2.6% of Si, 0.5-0.8% of Mn, less than 0.08% of P, less than 0.03% of S and the balance of iron and inevitable impurities. The single cylinder diesel engine body provided by the invention has the characteristics of less inclination of shrinkage cavity and shrinkage porosity and long service life. The invention further provides a preparation method of the single cylinder diesel engine body, which is reasonable in process.
Description
Technical field
The present invention relates to a kind of single cylinder diesel engine body, be specifically related to a kind of high nodulizing rate vermicular cast iron single cylinder diesel engine body and preparation method thereof.
Background technology
In the prior art, Foundry Production single cylinder diesel engine body adopts high-strength gray cast iron material mostly, as Gray Cast HT200, graphitic cast iron HT250, graphitic cast iron HT300 etc.In actual use, there is heat fatigue cracking in the single cylinder diesel engine body of gray iron material often, and this is the feature decision of grey cast iron, and because the unit elongation of gray iron is almost nil, heat-shock ability is poor.And the tensile strength of vermicular cast iron is higher than general high-strength gray cast iron, have certain unit elongation, anti-fatigue performance is better than general high-strength gray cast iron.But because the Foundry Production difficulty of vermicular cast iron is comparatively large, though some casting manufacturer production vermicular cast iron, be difficult to the vermicular cast iron stably obtaining high nodulizing rate.
Summary of the invention
For the deficiencies in the prior art, the object of this invention is to provide a kind of high nodulizing rate vermicular cast iron single cylinder diesel engine body, there is shrinkage cavity and porosity tendency little, the feature of long service life; The present invention also provides its preparation method, rational technology.
High nodulizing rate vermicular cast iron single cylinder diesel engine body of the present invention, comprises the chemical composition of following mass ratio:
C 3.5-3.8%, Si 2.1-2.6%, Mn 0.5-0.8%, P < 0.08%, S < 0.03%, all the other are iron and inevitable impurity.Inevitable impurity is rare earth, magnesium and calcium; Wherein, RE0.05-0.075%, Mg 0.01-0.03%, Ca0.03-0.05%.
The preparation method of described high nodulizing rate vermicular cast iron single cylinder diesel engine body, comprises the following steps:
(1) prepare burden by formula, raw material is mixed, in medium-frequency induction furnace melting;
(2) poly-to vermiculizer, part nucleating agent and part slag agent is put at the bottom of creepage rate handbag;
(3) the melting liquid after medium-frequency induction furnace melting is added remaining poly-slag agent removing slag, creepage rate bag that step (2) obtains carries out creepage rate to adopt dam-type ladle bottom pouring process to pour, and the process of pouring adds remaining nucleating agent current-following inoculation; Pour into a mould again, obtain single cylinder diesel engine body.
Wherein,
Step (1) Raw comprises low silicon iron, steel scrap, spheroidal graphite cast iron, vermicular cast iron foundry returns, ferrosilicon and ferromanganese, and Medium frequency induction furnace temperature is 1510 DEG C-1540 DEG C.Wherein, the mass content that ferrosilicon is preferably Si element is the ferrosilicon of 75%, and the mass content that ferromanganese is preferably Mn element is the ferromanganese of 65%.
Vermiculizer adopts rare earth ferrosilicon alloy, and add-on is the 0.7-1.0% of melting liquid quality.
Rare earth ferrosilicon alloy is made up of the component of following mass percent: rare earth 20-33%; Magnesium 0.5-1%; Calcium 3-5%; Silicon 40-45%, surplus is iron.One in preferred FeSiRe-23, FeSiRe-26, FeSiRe-29 or FeSiRe-32.
Nucleating agent is SiFe75 and SiCa, and the add-on of nucleating agent is the 0.68-0.92% of melting liquid quality, and wherein, the add-on of SiFe75 is the 0.6-0.8% of melting liquid quality, and the add-on of SiCa is the 0.08-0.12% of melting liquid quality.
In step (3), the add-on of nucleating agent is the 50%-70% of nucleating agent total mass, adds with stream when melting liquid pours creepage rate bag 1/3-2/3.
Poly-slag agent is magnesium iron bits, plant ash or perlite, and the add-on of poly-slag agent is the 0.25-0.4% of melting liquid quality; Wherein, the add-on of step (2) accounts for the 50%-70% of poly-slag agent total mass.
Nodulizing rate >=80% of single cylinder diesel engine body; In microstructure, perlite area accounts for 55-75%, and ferrite area accounts for 25-45%.
In step (3), teeming temperature is 1420 DEG C-1440 DEG C.
Compared with prior art, the present invention has following beneficial effect:
(1) mechanical property of single cylinder diesel engine body for preparing of the present invention: tensile strength >=320MPa, unit elongation >=1.5%, hardness 160-240HB.
(2) the single cylinder diesel engine body nodulizing rate that the present invention obtains reaches more than 80%.
(3) chemical composition carbon equivalent of the present invention is corresponding with nodulizing rate, be near eutectic point (wB%): C 3.5-3.8%, Si 2.1-2.6%, Mn 0.5-0.8%, P < 0.08%, S < 0.03%, melting liquid crystallisation range is narrow, good fluidity, castability is excellent, the single cylinder diesel engine body shrinkage cavity and porosity tendency obtained is little, long service life, excellent property.
(4) the present invention also provides its preparation method, rational technology.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
The all raw materials used in embodiment, except specified otherwise, are commercial.
Embodiment 1
A kind of single cylinder diesel engine body: be configured to following component by mass percentage: carbon 3.7%, silicon 2.3%, manganese 0.65%, P < 0.08%, S < 0.03%, surplus is iron and inevitable impurity.
Preparation method is as follows: with Z14 foundry iron, spheroidal graphite cast iron, vermicular cast iron foundry returns, ferrosilicon and ferromanganese for raw material, mixed by all raw materials, melting in medium-frequency induction furnace, and temperature is 1525 DEG C; Poly-to vermiculizer, part nucleating agent and part slag agent is put at the bottom of creepage rate handbag; After melting liquid components tests is qualified, the melting liquid after medium-frequency induction furnace melting is added remaining poly-slag agent removing slag, adopt dam-type ladle bottom pouring process to pour creepage rate bag and carry out creepage rate, the process of pouring adds remaining nucleating agent current-following inoculation; Creepage rate is complete to be poured into a mould again, and teeming temperature is 1430 DEG C, obtains single cylinder diesel engine body.
Wherein: vermiculizer used is rare earth ferrosilicon alloy, the add-on of vermiculizer is 0.85% of melting liquid quality.Nucleating agent used is the mixture of SiFe75 and SiCa, and the add-on of SiFe75 is the add-on of 0.6%, SiCa of melting liquid quality is 0.08% of melting liquid quality; Wherein, the nucleating agent of 0.4% is put at the bottom of creepage rate handbag, and rest part, when melting liquid pours creepage rate bag 1/2, adds with stream.Poly-slag agent used is magnesium iron bits, and the add-on of poly-slag agent is 0.3% of melting liquid quality; Wherein, the poly-slag agent of 0.15% is put at the bottom of creepage rate handbag.
Rare earth ferrosilicon alloy is: FeSiRe-23.
The single cylinder diesel engine body that embodiment 1 prepares, yield rate reaches 95%, and nodulizing rate is 95%.In microstructure, perlite area accounts for 65%, and ferrite area accounts for 35%.Carry out Mechanics Performance Testing to it: tensile strength is 340MPa, unit elongation 3%, hardness is 180.
Embodiment 2
A kind of single cylinder diesel engine body: be configured to following component by mass percentage: carbon 3.5%, silicon 2.1%, manganese 0.5%, P < 0.08%, S < 0.03%, surplus is iron and inevitable impurity.
Preparation method is as follows: with Z14 foundry iron, spheroidal graphite cast iron, vermicular cast iron foundry returns, ferrosilicon and ferromanganese for raw material, mixed by all raw materials, melting in medium-frequency induction furnace, and temperature is 1510 DEG C; Poly-to vermiculizer, part nucleating agent and part slag agent is put at the bottom of creepage rate handbag; After melting liquid components tests is qualified, the melting liquid after medium-frequency induction furnace melting is added remaining poly-slag agent removing slag, adopt dam-type ladle bottom pouring process to pour creepage rate bag and carry out creepage rate, the process of pouring adds remaining nucleating agent current-following inoculation; Creepage rate is complete to be poured into a mould again, and teeming temperature is 1420 DEG C, obtains single cylinder diesel engine body.
Wherein: vermiculizer used is rare earth ferrosilicon alloy, the add-on of vermiculizer is 0.7% of melting liquid quality.Nucleating agent used is the mixture of SiFe75 and SiCa, and the add-on of SiFe75 is the add-on of 0.7%, SiCa of melting liquid quality is 0.1% of melting liquid quality; Wherein, the nucleating agent of 0.4% is put at the bottom of creepage rate handbag, and rest part, when melting liquid pours creepage rate bag 1/2, adds with stream.Poly-slag agent used is magnesium iron bits, and the add-on of poly-slag agent is 0.4% of melting liquid quality; Wherein, the poly-slag agent of 0.2% is put at the bottom of creepage rate handbag.
Rare earth ferrosilicon alloy is: FeSiRe-26.
The single cylinder diesel engine body that embodiment 2 prepares, yield rate reaches 95%, and nodulizing rate is 85%.In microstructure, perlite area accounts for 60%, and ferrite area accounts for 40%.Carry out Mechanics Performance Testing to it: tensile strength is 325MPa, unit elongation 3%, hardness is 170.
Embodiment 3
A kind of single cylinder diesel engine body: be configured to following component by mass percentage: carbon 3.8%, silicon 2.6%, manganese 0.8%, P < 0.08%, S < 0.03%, surplus is iron and inevitable impurity.
Preparation method is as follows: with Z14 foundry iron, spheroidal graphite cast iron, vermicular cast iron foundry returns, ferrosilicon and ferromanganese for raw material, mixed by all raw materials, melting in medium-frequency induction furnace, and temperature is 1540 DEG C; Poly-to vermiculizer, part nucleating agent and part slag agent is put at the bottom of creepage rate handbag; After melting liquid components tests is qualified, the melting liquid after medium-frequency induction furnace melting is added remaining poly-slag agent removing slag, adopt dam-type ladle bottom pouring process to pour creepage rate bag and carry out creepage rate, the process of pouring adds remaining nucleating agent current-following inoculation; Creepage rate is complete to be poured into a mould again, and teeming temperature is 1440 DEG C, obtains single cylinder diesel engine body.
Wherein: vermiculizer used is rare earth ferrosilicon alloy, the add-on of vermiculizer is 1.0% of melting liquid quality.Nucleating agent used is the mixture of SiFe75 and SiCa, and the add-on of SiFe75 is the add-on of 0.8%, SiCa of melting liquid quality is 0.12% of melting liquid quality; Wherein, the nucleating agent of 0.4% is put at the bottom of creepage rate handbag, and rest part, when melting liquid pours creepage rate bag 1/2, adds with stream.Poly-slag agent used is magnesium iron bits, and the add-on of poly-slag agent is 0.4% of melting liquid quality; Wherein, the poly-slag agent of 0.2% is put at the bottom of creepage rate handbag.
Rare earth ferrosilicon alloy is: FeSiRe-32.
The single cylinder diesel engine body that embodiment 3 prepares, yield rate reaches 95%, and nodulizing rate is 90%.In microstructure, perlite area accounts for 70%, and ferrite area accounts for 30%.Carry out Mechanics Performance Testing to it: tensile strength is 350MPa, unit elongation 3%, hardness is 190.
Claims (10)
1. a high nodulizing rate vermicular cast iron single cylinder diesel engine body, is characterized in that: the chemical composition comprising following mass ratio:
C 3.5-3.8%, Si 2.1-2.6%, Mn 0.5-0.8%, P < 0.08%, S < 0.03%, all the other are iron and inevitable impurity.
2. a preparation method for high nodulizing rate vermicular cast iron single cylinder diesel engine body according to claim 1, is characterized in that: comprise the following steps:
(1) prepare burden by formula, raw material is mixed, in medium-frequency induction furnace melting;
(2) poly-to vermiculizer, part nucleating agent and part slag agent is put at the bottom of creepage rate handbag;
(3) the melting liquid after medium-frequency induction furnace melting is added remaining poly-slag agent removing slag, creepage rate bag that step (2) obtains carries out creepage rate to adopt dam-type ladle bottom pouring process to pour, and the process of pouring adds remaining nucleating agent current-following inoculation; Pour into a mould again, obtain single cylinder diesel engine body.
3. the preparation method of high nodulizing rate vermicular cast iron single cylinder diesel engine body according to claim 2, it is characterized in that: step (1) Raw comprises low silicon iron, steel scrap, spheroidal graphite cast iron, vermicular cast iron foundry returns, ferrosilicon and ferromanganese, Medium frequency induction furnace temperature is 1510 DEG C-1540 DEG C.
4. the preparation method of high nodulizing rate vermicular cast iron single cylinder diesel engine body according to claim 2, is characterized in that: vermiculizer adopts rare earth ferrosilicon alloy, and add-on is the 0.7-1.0% of melting liquid quality.
5. the preparation method of high nodulizing rate vermicular cast iron single cylinder diesel engine body according to claim 4, is characterized in that: rare earth ferrosilicon alloy is made up of the component of following mass percent: rare earth 20-33%; Magnesium 0.5-1%; Calcium 3-5%; Silicon 40-45%, surplus is iron.
6. the preparation method of high nodulizing rate vermicular cast iron single cylinder diesel engine body according to claim 2, it is characterized in that: nucleating agent is SiFe75 and SiCa, the add-on of nucleating agent is the 0.68-0.92% of melting liquid quality, wherein, the add-on of SiFe75 is the 0.6-0.8% of melting liquid quality, and the add-on of SiCa is the 0.08-0.12% of melting liquid quality.
7. the preparation method of high nodulizing rate vermicular cast iron single cylinder diesel engine body according to claim 2, it is characterized in that: in step (3), the add-on of nucleating agent is the 50%-70% of nucleating agent total mass, adds with stream when melting liquid pours creepage rate bag 1/3-2/3.
8. the preparation method of high nodulizing rate vermicular cast iron single cylinder diesel engine body according to claim 2, is characterized in that: poly-slag agent is magnesium iron bits, plant ash or perlite, and the add-on of poly-slag agent is the 0.25-0.4% of melting liquid quality; Wherein, the add-on of step (2) accounts for the 50%-70% of poly-slag agent total mass.
9. the preparation method of high nodulizing rate vermicular cast iron single cylinder diesel engine body according to claim 2, is characterized in that: nodulizing rate >=80% of single cylinder diesel engine body; In microstructure, perlite area accounts for 55-75%, and ferrite area accounts for 25-45%.
10. the preparation method of high nodulizing rate vermicular cast iron single cylinder diesel engine body according to claim 2, is characterized in that: in step (3), teeming temperature is 1420 DEG C-1440 DEG C.
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Cited By (6)
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| CN105316568A (en) * | 2015-11-19 | 2016-02-10 | 宁静 | Engine cylinder cover |
| CN105970075A (en) * | 2016-07-15 | 2016-09-28 | 江苏汽铸造股份有限公司 | Technique for preparing vermicular cast iron material |
| CN106148810A (en) * | 2016-06-24 | 2016-11-23 | 宁波宏协离合器有限公司 | A kind of vermicular cast iron automobile clutch pressure plate material and preparation method thereof |
| CN107586911A (en) * | 2016-07-08 | 2018-01-16 | 机械科学研究总院先进制造技术研究中心 | The new vermiculizer of vermicular cast iron |
| CN109468525A (en) * | 2018-10-09 | 2019-03-15 | 安徽大天铸业有限责任公司 | A kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell |
| CN115074613A (en) * | 2022-05-17 | 2022-09-20 | 烟台大学 | High-thermal-conductivity high-thermal-fatigue-resistance vermicular graphite cast iron and preparation method thereof |
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| CN103131942A (en) * | 2011-11-30 | 2013-06-05 | 山东省源通机械股份有限公司 | Vermicular graphite cast iron with high percent of vermiculation of combustion motor cylinder body and cylinder cover and preparation method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105316568A (en) * | 2015-11-19 | 2016-02-10 | 宁静 | Engine cylinder cover |
| CN106148810A (en) * | 2016-06-24 | 2016-11-23 | 宁波宏协离合器有限公司 | A kind of vermicular cast iron automobile clutch pressure plate material and preparation method thereof |
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| CN109468525A (en) * | 2018-10-09 | 2019-03-15 | 安徽大天铸业有限责任公司 | A kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell |
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| CN115074613A (en) * | 2022-05-17 | 2022-09-20 | 烟台大学 | High-thermal-conductivity high-thermal-fatigue-resistance vermicular graphite cast iron and preparation method thereof |
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Denomination of invention: High vermicular graphite cast iron single cylinder diesel engine block and its preparation method Effective date of registration: 20211115 Granted publication date: 20170517 Pledgee: Agricultural Bank of China Limited by Share Ltd. Yiyuan county subbranch Pledgor: SHANDONG YUANTONG MACHINERY Co.,Ltd. Registration number: Y2021370000135 |
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Date of cancellation: 20230522 Granted publication date: 20170517 Pledgee: Agricultural Bank of China Limited by Share Ltd. Yiyuan county subbranch Pledgor: SHANDONG YUANTONG MACHINERY Co.,Ltd. Registration number: Y2021370000135 |
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