CN113564453A - High-grade diesel engine body casting and manufacturing method thereof - Google Patents
High-grade diesel engine body casting and manufacturing method thereof Download PDFInfo
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- CN113564453A CN113564453A CN202110766402.2A CN202110766402A CN113564453A CN 113564453 A CN113564453 A CN 113564453A CN 202110766402 A CN202110766402 A CN 202110766402A CN 113564453 A CN113564453 A CN 113564453A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/08—Manufacture of cast-iron
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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
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
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Abstract
The invention discloses a high-grade diesel engine body casting and a manufacturing method thereof, wherein the formula comprises the following components in percentage by weight: 10-30% of high-purity pig iron, 30-60% of return iron of vermicular cast iron and 30-60% of low-sulfur scrap steel, wherein an Angen compact Mag vermiculizer is added according to the sulfur content of the base iron, the process range is 0.25-0.35%, and an Angen Barinoc inoculant is added, the process range is 0.25-0.35%. And (5) obtaining a qualified casting meeting the high-strength performance index through vermicular treatment, casting test blocks and body inspection. The invention discloses a formula and a manufacturing method by using a special process, which improve the strength and compactness of a casting and reduce scrap caused by leakage of the casting.
Description
Technical Field
The invention relates to the field of casting, in particular to a high-grade diesel engine body casting and a manufacturing method thereof.
Background
With the development of the trend of high power, high strength and light weight of the engine in the diesel engine industry, the diesel engine puts forward higher and higher requirements on the material performance of the cast cylinder body. The alloy cast iron is difficult to meet the continuously improved requirements of high-power diesel engines, and simultaneously, along with the improvement of the alloy content, the compactness of castings is deteriorated, the leakage of cylinder bodies is more and more, and the rejection rate is greatly increased. With the rapid development of new materials and new process technologies and the continuous improvement of the process level of the casting industry, the new process (vermicular cast iron punching process) is used for improving the strength of castings and overcoming the defect of poor compactness of alloy cast iron, and the method becomes the target and the direction of the domestic casting industry. This goal plays a key role in driving the application and development of vermicular cast iron. The vermicular cast iron casting has good strength, thermal conductivity, wear resistance, corrosion resistance and thermal fatigue resistance under severe conditions of high temperature and high pressure, and well meets the requirements. The cylinder body is used as a key basic part of the diesel engine, and the high-strength cylinder body produced by vermicular graphite cast iron is also in line with the development trend of high-power diesel engines.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to meet the requirements of high-power diesel engine castings on strength, wear resistance, corrosion resistance and thermal fatigue resistance and improve the compactness of the castings.
The technical scheme is as follows: a high-grade diesel engine body casting is prepared by the following formula in percentage by weight:
10-30% of high-purity pig iron;
returning the compacted iron by 30-60%;
30-60% of low-sulfur scrap steel;
adding an Eken compact Mag vermiculizer according to the sulfur content of the base iron, wherein the process range is 0.25-0.35%; adding an Eken Barinoc inoculant, wherein the process range is 0.25-0.35%, and obtaining a qualified casting meeting high-strength performance indexes through vermicular treatment, casting block attachment and body inspection.
As an optimization: the formula of the high-grade diesel engine body casting comprises the following components in percentage by weight: 20% of high-purity pig iron, 40% of return iron of vermicular cast iron and 40% of low-sulfur scrap steel, adding an Angen compact Mag vermiculizer according to the sulfur content of the base iron, wherein the process range is 0.25-0.35%, and adding an Angen Barinoc inoculant, wherein the process range is 0.25-0.35%.
The manufacturing method of the high-grade diesel engine body casting comprises the following steps:
A. the raw materials are as follows: high-purity pig iron: s is less than or equal to 0.015 percent and Ti is less than or equal to 0.02 percent; scrap steel: low S and low Ti, wherein S is less than or equal to 0.015 percent, and Ti is less than or equal to 0.02 percent; carburant: s is less than or equal to 0.02 percent, and the nitrogen content is less than 200 (PPM);
B. the proportion of ingredients is as follows: 20% of high-purity pig iron, 40% of return iron of vermicular iron, 40% of low-sulfur scrap steel, and a carburant, ferrosilicon, ferromanganese, copper and tin;
C. smelting: 10000kg of medium-frequency induction electric furnace is used, the power is 6000KW, and chemical components are adjusted after melting down for 40 minutes;
D. and (3) detection: the base iron comprises the following chemical components in percentage by weight: c, 3.85% +/-0.05%; 1.68% +/-0.05% of Si; 0.45% +/-0.05% of Mn; 0.8 to 0.9 percent of Cu; 0.08 to 0.09 percent of Sn; 0.008 to 0.016 percent of S;
E. determining the addition of the Eken compactMag vermiculizer and the Eken Barinoc inoculant: according to the S percent of the base iron, the tapping quantity is calculated and weighed according to the following content:
when the S content of the base iron is as follows: at 0.008% to 0.009%, the addition of the ekan CompactMag vermiculizer (nodulizer) was: 0.26 to 0.29 percent; the addition of the ekan Barinoc inoculant (nodulizing ladle) was: 0.3 percent; the adding amount of the ladle inoculant (pouring ladle) is as follows: 0 to 0.1 percent;
when the S content of the base iron is as follows: at 0.010% to 0.011%, the addition of the eken CompactMag vermiculizer (balling ladle) is: 0.3% -0.32%; the addition of the ekan Barinoc inoculant (nodulizing ladle) was: 0.3 percent; the adding amount of the ladle inoculant (pouring ladle) is as follows: 0 to 0.1 percent;
when the S content of the base iron is as follows: from 0.012% to 0.015%, the addition of the eken CompactMag creep agent (balling packet) is: 0.33 to 0.35 percent; the addition of the ekan Barinoc inoculant (nodulizing ladle) was: 0.3 percent; the adding amount of the ladle inoculant (pouring ladle) is as follows: 0 to 0.1 percent;
F. vermicular treatment: weighing the Eken compact Mag vermiculizer and the Eken Barinoc inoculant, adding the weighed materials into a spheroidizing pit, tamping and compacting the Eken compact Mag vermiculizer and the Eken Barinoc inoculant, tapping, and fully reflecting the detonation of the vermiculizer to obtain qualified Rut450 molten iron.
As an optimization: the specific formula content of the Eken compact Mag vermiculizer is as follows by weight percent: RE (%): 5.5-6.5 Mg (%): 5.0-6.6 Ca (%): 1.8-2.3 Al (%): 1Si (%): 44-48 Fe (%): and (4) the balance.
As an optimization: the specific formula content of the Eken Barinoc inoculant comprises the following components in percentage by weight: ba (%): 2.0-3.0 Ca (%): 1.0 to 2.0Al (%): 0.8 to 1.5Si (%): 72-77 Fe (%): and (4) the balance.
Has the advantages that: according to the invention, through the matching of the formula and the manufacturing method, the casting is ensured to stably obtain a Rut450 high-strength material, and a vermicular graphite structure is obtained. The compactness of the casting is improved, the leakage of the engine body is reduced, and the quality of the engine body of the 7H diesel engine is further improved.
The invention adopts the high-strength vermicular graphite cast iron casting technology, and the tensile strength requirement of the casting body is more than 420 MPa. The adopted vermicular process technology ensures that the vermicular rate is more than 70 percent.
The graphite casting contains chemical components with high carbon equivalent, improves the density of the casting through the self expansion of the graphite, and solves the problems of shrinkage porosity, shrinkage, and leakage of the casting.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below so that those skilled in the art can better understand the advantages and features of the present invention, and thus the scope of the present invention will be more clearly defined. The embodiments described herein are only a few embodiments of the present invention, rather than all embodiments, and all other embodiments that can be derived by one of ordinary skill in the art without inventive faculty based on the embodiments described herein are intended to fall within the scope of the present invention.
Examples
A manufacturing method of a high-grade diesel engine body casting comprises the following steps:
A. the raw materials are as follows: high-purity pig iron: s is less than or equal to 0.015 percent and Ti is less than or equal to 0.02 percent; scrap steel: low S and low Ti, wherein S is less than or equal to 0.015 percent, and Ti is less than or equal to 0.02 percent; carburant: s is less than or equal to 0.02 percent, and the nitrogen content is less than 200 (PPM);
B. the proportion of ingredients is as follows: 20% of high-purity pig iron, 40% of return iron of vermicular iron, 40% of low-sulfur scrap steel, and a carburant, ferrosilicon, ferromanganese, copper and tin;
C. smelting: 10000kg of medium-frequency induction electric furnace is used, the power is 6000KW, and chemical components are adjusted after melting down for 40 minutes;
D. and (3) detection: the base iron comprises the following chemical components in percentage by weight: c, 3.85% +/-0.05%; 1.68% +/-0.05% of Si; 0.45% +/-0.05% of Mn; 0.8 to 0.9 percent of Cu; 0.08 to 0.09 percent of Sn; 0.008 to 0.016 percent of S;
E. determining the addition of the Eken compactMag vermiculizer and the Eken Barinoc inoculant: according to the S percent of the base iron, the tapping quantity is calculated and weighed according to the following content:
TABLE 1 chemical composition
F. Vermicular treatment: weighing the Eken compact Mag vermiculizer and the Eken Barinoc inoculant, adding the weighed materials into a spheroidizing pit, tamping and compacting the Eken compact Mag vermiculizer and the Eken Barinoc inoculant, tapping, and fully reflecting the detonation of the vermiculizer to obtain qualified Rut450 molten iron.
The specific formula content of the Eken compact Mag vermiculizer is as follows by weight percent: RE (%): 5.5-6.5 Mg (%): 5.0-6.6 Ca (%): 1.8-2.3 Al (%): 1Si (%): 44-48 Fe (%): and (4) the balance.
The specific formula content of the Eken Barinoc inoculant comprises the following components in percentage by weight: ba (%): 2.0-3.0 Ca (%): 1.0 to 2.0Al (%): 0.8 to 1.5Si (%): 72-77 Fe (%): and (4) the balance.
The body detection of the invention is as follows:
the chemical components of the product are shown in a table 2:
TABLE 2 product chemistry
The metallographic structure of the product is shown in table 3:
TABLE 3 metallographic structure of the product
③ the mechanical properties of the product are shown in Table 4:
TABLE 4 mechanical Property Table of products
In conclusion, the invention ensures that the casting stably obtains Rut450 high-strength material and obtains vermicular graphite tissue by matching the formula and the manufacturing method, improves the compactness of the casting, reduces the leakage of the engine body and further improves the quality of the engine body of the 7H diesel engine.
The invention adopts the high-strength vermicular graphite cast iron casting technology, and the tensile strength requirement of the casting body is more than 420 MPa. The adopted vermicular process technology ensures that the vermicular rate is more than 70 percent.
The graphite casting contains chemical components with high carbon equivalent, improves the density of the casting through the self expansion of the graphite, and solves the problems of shrinkage porosity, shrinkage, and leakage of the casting.
Claims (5)
1. The utility model provides a high-grade diesel engine organism foundry goods which characterized in that: the formula of the high-grade diesel engine body casting comprises the following components in percentage by weight:
10-30% of high-purity pig iron;
returning the compacted iron by 30-60%;
30-60% of low-sulfur scrap steel;
adding an Eken compact Mag vermiculizer according to the sulfur content of the base iron, wherein the process range is 0.25-0.35%; adding an Eken Barinoc inoculant, wherein the process range is 0.25-0.35%, and obtaining a qualified casting meeting high-strength performance indexes through vermicular treatment, casting block attachment and body inspection.
2. The high-grade diesel engine block casting of claim 1, wherein: the formula of the high-grade diesel engine body casting comprises the following components in percentage by weight: 20% of high-purity pig iron, 40% of return iron of vermicular cast iron and 40% of low-sulfur scrap steel, adding an Angen compact Mag vermiculizer according to the sulfur content of the base iron, wherein the process range is 0.25-0.35%, and adding an Angen Barinoc inoculant, wherein the process range is 0.25-0.35%.
3. A method of making a high grade diesel engine block casting according to claim 1, wherein: the method comprises the following steps:
A. the raw materials are as follows: high-purity pig iron: s is less than or equal to 0.015 percent and Ti is less than or equal to 0.02 percent; scrap steel: low S and low Ti, wherein S is less than or equal to 0.015 percent, and Ti is less than or equal to 0.02 percent; carburant: s is less than or equal to 0.02 percent, and the nitrogen content is less than 200 (PPM);
B. the proportion of ingredients is as follows: 20% of high-purity pig iron, 40% of return iron of vermicular iron, 40% of low-sulfur scrap steel, and a carburant, ferrosilicon, ferromanganese, copper and tin;
C. smelting: 10000kg of medium-frequency induction electric furnace is used, the power is 6000KW, and chemical components are adjusted after melting down for 40 minutes;
D. and (3) detection: the base iron comprises the following chemical components in percentage by weight: c, 3.85% +/-0.05%; 1.68% +/-0.05% of Si; 0.45% +/-0.05% of Mn; 0.8 to 0.9 percent of Cu; 0.08 to 0.09 percent of Sn; 0.008 to 0.016 percent of S;
E. determining the addition of the Eken compactMag vermiculizer and the Eken Barinoc inoculant: according to the S percent of the base iron, the tapping quantity is calculated and weighed according to the following content:
when the S content of the base iron is as follows: at 0.008% to 0.009%, the addition of the ekan CompactMag vermiculizer (nodulizer) was: 0.26 to 0.29 percent; the addition of the ekan Barinoc inoculant (nodulizing ladle) was: 0.3 percent; the adding amount of the ladle inoculant (pouring ladle) is as follows: 0 to 0.1 percent;
when the S content of the base iron is as follows: at 0.010% to 0.011%, the addition of the eken CompactMag vermiculizer (balling ladle) is: 0.3% -0.32%; the addition of the ekan Barinoc inoculant (nodulizing ladle) was: 0.3 percent; the adding amount of the ladle inoculant (pouring ladle) is as follows: 0 to 0.1 percent;
when the S content of the base iron is as follows: from 0.012% to 0.015%, the addition of the eken CompactMag creep agent (balling packet) is: 0.33 to 0.35 percent; the addition of the ekan Barinoc inoculant (nodulizing ladle) was: 0.3 percent; the adding amount of the ladle inoculant (pouring ladle) is as follows: 0 to 0.1 percent;
F. vermicular treatment: weighing the Eken compact Mag vermiculizer and the Eken Barinoc inoculant, adding the weighed materials into a spheroidizing pit, tamping and compacting the Eken compact Mag vermiculizer and the Eken Barinoc inoculant, tapping, and fully reflecting the detonation of the vermiculizer to obtain qualified Rut450 molten iron.
4. The method of manufacturing a high-grade diesel engine block casting according to claim 3, wherein: the specific formula content of the Eken compact Mag vermiculizer is as follows by weight percent: RE (%): 5.5-6.5 Mg (%): 5.0-6.6 Ca (%): 1.8-2.3 Al (%): 1Si (%): 44-48 Fe (%): and (4) the balance.
5. The method of manufacturing a high-grade diesel engine block casting according to claim 3, wherein: the specific formula content of the Eken Barinoc inoculant comprises the following components in percentage by weight: ba (%): 2.0-3.0 Ca (%): 1.0 to 2.0Al (%): 0.8 to 1.5Si (%): 72-77 Fe (%): and (4) the balance.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102796939A (en) * | 2012-08-29 | 2012-11-28 | 丹阳市锦雄机械制造有限公司 | Method for vermicular cast iron by using mixed vermiculizer |
| CN107619989A (en) * | 2017-09-06 | 2018-01-23 | 广西玉柴机器股份有限公司 | The casting technique of high intensity vermicular cast iron material |
| CN109371315A (en) * | 2018-10-24 | 2019-02-22 | 东风商用车有限公司 | A kind of high intensity vermicular cast iron and preparation method thereof |
| CN111187973A (en) * | 2020-03-02 | 2020-05-22 | 锦州捷通铁路机械股份有限公司 | High-elongation RuT400 vermicular graphite cast iron and production process thereof |
| CN112030063A (en) * | 2020-08-17 | 2020-12-04 | 锦州捷通铁路机械股份有限公司 | Process for producing high-elongation RuT350 vermicular graphite cast iron for railway rolling stock by covering vermicular graphite |
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2021
- 2021-07-07 CN CN202110766402.2A patent/CN113564453B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102796939A (en) * | 2012-08-29 | 2012-11-28 | 丹阳市锦雄机械制造有限公司 | Method for vermicular cast iron by using mixed vermiculizer |
| CN107619989A (en) * | 2017-09-06 | 2018-01-23 | 广西玉柴机器股份有限公司 | The casting technique of high intensity vermicular cast iron material |
| CN109371315A (en) * | 2018-10-24 | 2019-02-22 | 东风商用车有限公司 | A kind of high intensity vermicular cast iron and preparation method thereof |
| CN111187973A (en) * | 2020-03-02 | 2020-05-22 | 锦州捷通铁路机械股份有限公司 | High-elongation RuT400 vermicular graphite cast iron and production process thereof |
| CN112030063A (en) * | 2020-08-17 | 2020-12-04 | 锦州捷通铁路机械股份有限公司 | Process for producing high-elongation RuT350 vermicular graphite cast iron for railway rolling stock by covering vermicular graphite |
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