CN103627961B - Manufacturing method for air inlet valve - Google Patents
Manufacturing method for air inlet valve Download PDFInfo
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- CN103627961B CN103627961B CN201310618611.8A CN201310618611A CN103627961B CN 103627961 B CN103627961 B CN 103627961B CN 201310618611 A CN201310618611 A CN 201310618611A CN 103627961 B CN103627961 B CN 103627961B
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Abstract
The invention discloses an air inlet valve and a manufacturing method thereof. Alloy for manufacturing the air inlet valve comprises the following components in percentage by weight: 0.32-0.40% of C, 0.17-0.37% of Si, 2.5-3.5% of Mo, 0.50-0.80% of Mn, 0.80-1.10% of Cr, 0.50-1.0% of W, less than or equal to 0.030% of Ni, less than or equal to 0.015 of P, less than or equal to 0.015 of S, less than or equal to 0.010% of Cu and the balance of Fe. The air inlet valve is manufactured by the technologies such as surface nanocrystallization, low-temperature nitriding and surfacing of tungsten-zirconium alloy and the like. The air inlet valve has high surface strength, high hardness, good abrasion performance and long service life.
Description
Technical field
The present invention relates to machinofacture and metal material field, particularly relate to a kind of inlet valve and preparation method thereof.
Background technology
Valve is one of vital part of engine, and it is used to the direct part opening or closing inlet and outlet road.Valve is divided into inlet valve and blast gate, air is entered in engine cylinder by inlet valve and burns with fuel mix, burning after produce waste gas discharge cylinder by blast gate, thus realize fresh air enter cylinder combustion produce vehicle travel power and scavenge.Current engine is generally provided with multiple valve.Commonly each cylinder arrangement has 4 valves, and the engine one of 4 cylinders has 16 valves.This many air valve structures easily form compact type combustion chamber, oil nozzle in central authorities, can make air-fuel mixture gas firing more rapidly like this evenly, weight and the aperture of each valve suitably reduce, make valve opening or closed speed faster.
The work characteristics of engine requires that inlet valve will possess the feature such as abrasion-resistant, high temperature resistant, antifatigue, high tenacity, and the performance of valve material directly has influence on the performance of engine.High commercial due to this technology is worth and trade secret highly, and the relevant report in valve material and complete processing thereof is few.Valve material domestic at present have 40Cr, 4Cr9Si2,4Cr10Si2Mo, 21-4N and 23-8N etc. a few.But the current service life of China is still not as good as 1/3rd of Foreign Advanced Lerel.
Patent of invention 102493853A proposes and adopts TiAl base intermetallic compound as valve material.This material can be greatly improved in high temperature resistant, but its toughness does not still reach the standard of industrial application, and there is expensive problem.
Summary of the invention
Goal of the invention: for solving the problems of the technologies described above, the invention provides the inlet valve and preparation method thereof of this kind of moderate cost, Good Heat-resistance, excelling in fatigue property.
Technical scheme: for realizing technique scheme, the invention provides a kind of inlet valve, and the alloying constituent weight percentage ranges that this inlet valve adopts is: C:0.32 ~ 0.40%; Si:0.17 ~ 0.37%; Mo:2.5 ~ 3.5%; Mn:0.50 ~ 0.80%; Cr:0.80 ~ 1.10%; W:0.50 ~ 1.0%; Surplus to be purity be 99.8% Fe.Wherein, to be the impurity weight percent content in the Fe of 99.8% be purity: Ni :≤0.030%; P :≤0.015; S :≤0.015; Cu :≤0.010%.
The manufacture method of above-mentioned inlet valve, comprises following processing step:
(1) prepare batching according to alloy component range, alloy material is mixed;
(2) adopt vacuum induction melting, temperature controls at 1600 ~ 1650 DEG C, melting 1 ~ 1.5 hour;
(3) adopt forging or rolling mode shaping, obtain inlet valve blank;
(4) Tempering and Quenching is carried out, then machining, surperficial supersound process, obtains nano surface crystalline substance;
(5) Nitrizing Treatment is carried out at 330 ~ 360 DEG C;
(6) milling machine processing is adopted to carry out surface smoothness process to the conical surface;
(7) at conical surface built-up welding tungsten zirconium alloy, wherein the content of tungsten is 40 ~ 60%, and zirconium is surplus;
(8) milling machine processing is adopted again to carry out surface treatment, control surface smooth finish.
Wherein, the step of the Tempering and Quenching in step (4) for be incubated 1-1.5h at 800-850 DEG C, and quenching, is then heated to 450-500 DEG C, insulation 2-2.5 hour, last air cooling.
The processing conditions of the machining described in step (4) is: it is spherical for impacting working head, and output terminal arc radius is 2mm, the amplitude of rotating speed 200r/min impact head is 5 μm.
Surperficial supersound process described in step (4) be at room temperature, frequency control carries out under the condition of 3-3.5 ten thousand hertz.
In step (5), the processing parameter of conical surface built-up welding tungsten zirconium alloy is: preheating at 450 DEG C, weldingvoltage is 300V, electric current 900A.
Beneficial effect: alloy Good Heat-resistance of the present invention, excelling in fatigue property, the life-span is high, and bench testing shows that the life-span of this alloy valve is more than 2 times of current 40Cr, remarkable in economical benefits.The present invention adopts making Nano surface technology, makes material surface obtain improvement in various degree with overall machinery and chemical property.Making Nano surface improving the friction and wear behavior of material, improve the shock resistance of material surface, improve material monolithic performance while all played important effect in the toughness of not obvious reduction material, the chemical property improving material surface, the intensity improving material, hardness and solidity to corrosion etc.The technique of making Nano surface and low temperature nitriding is a kind of novel compound surface strengthening means, wear resistance and the erosion resistance of material surface can be improved, simultaneously, this technology can improve the defects such as the temperature of traditional nitriding is high, the cycle is long, substantially increases the surface strength of alloy, hardness and wear resistance when not changing base mateiral performance.On the other hand, alloy adopts built-up welding tungsten zirconium alloy, substantially increases the resistance to elevated temperatures of the conical surface, hardness and wear resistance.
Embodiment
The purity used in each embodiment is below the weight percent content of impurity in the Fe of 99.8: Ni :≤0.030%; P :≤0.015; S :≤0.015; Cu :≤0.010%.
Embodiment 1
Through processes inlet valves such as making Nano surface, low temperature nitriding, built-up welding tungsten zirconium alloys, concrete steps are as follows:
(1) prepare burden, weight alloy percent composition is: C:0.32%; Si:0.17%; Mo:2.5%; Mn:0.50%; Cr:0.80%; W:0.50%; Clout to be purity be 99.8% Fe, alloy material is mixed;
(2) vacuum induction melting is adopted, temperature 1600 DEG C, melting 1.5 hours;
(3) adopt forging molding, obtain valve blank;
(4) carry out Tempering and Quenching, namely at 850 DEG C, be incubated 1h, quenching, is then heated to 500 DEG C, is incubated 2 hours, last air cooling; Machining again, processing conditions is: it is spherical for impacting working head, and output terminal arc radius is 2mm, rotating speed 200r/min; The amplitude of impact head is 5 μm; Finally carry out surperficial supersound process at ambient temperature, frequency control, 3-3.5 ten thousand hertz, obtains nano surface crystalline substance;
(5) at 350 DEG C, Nitrizing Treatment is carried out;
(6) milling machine processing is adopted to carry out surface smoothness process to the conical surface;
(7) at conical surface built-up welding tungsten zirconium alloy, use the online open arc automatic resurfacing welding machine of ARC-NMP7-1 type to carry out built-up welding tungsten zirconium alloy, processing parameter is: preheating temperature is 450 DEG C, and weldingvoltage is 30 volts, 900 amperes, electric current, wherein the content of tungsten is 40%, and zirconium is surplus;
(8) again carry out surface smoothness process with milling machine processing, obtain final accessory size.
Embodiment 2 is (in embodiment 2-5, the processing condition of Tempering and Quenching, namely 1-1.5h is incubated at 800-850 DEG C, quenching, then be heated to 450-500 DEG C, insulation 2-2.5 hour, because whether these numerical ranges uncertain are suitable, if suitable, please teacher modify from selecting data within the scope of these in the following embodiments! Ok)
Through processes inlet valves such as making Nano surface, low temperature nitriding, built-up welding tungsten zirconium alloys, concrete steps are as follows:
(1) prepare burden, weight alloy percent composition is: C:0.40%; Si:0.37%; Mo:3.5%; Mn:0.80%; Cr:1.10%; W:1.0%; Clout to be purity be 99.8% Fe, alloy material is mixed.
(2) vacuum induction melting is adopted, temperature 1650 DEG C, melting 1 hour;
(3) adopt forging molding, obtain valve blank;
(4) carry out Tempering and Quenching, namely at 850 DEG C, be incubated 1.5h, quenching, is then heated to 450 DEG C, is incubated 2.5 hours, last air cooling; Machining again, processing conditions is: it is spherical for impacting working head, and output terminal arc radius is 2mm, rotating speed 200r/min; The amplitude of impact head is 5 μm; Finally carry out surperficial supersound process at ambient temperature, frequency control, 3-3.5 ten thousand hertz, obtains nano surface crystalline substance;
(5) Nitrizing Treatment is carried out at 360 DEG C;
(6) milling machine processing is adopted to carry out surface smoothness process to the conical surface;
(7) at conical surface built-up welding tungsten zirconium alloy, use the online open arc automatic resurfacing welding machine of ARC-NMP7-1 type to carry out built-up welding tungsten zirconium alloy, processing parameter is: preheating temperature is 450 DEG C, and weldingvoltage is 30 volts, 900 amperes, electric current, wherein the content of tungsten is 60%, and zirconium is surplus;
(8) again carry out surface smoothness process with milling machine processing, obtain final accessory size.
Embodiment 3
Through processes inlet valves such as making Nano surface, low temperature nitriding, built-up welding tungsten zirconium alloys, concrete steps are as follows:
(1) prepare burden, weight alloy percent composition is: C:0.34%; Si:0.25%; Mo:2.75%; Mn:0.60%; Cr:1.00%; W:0.80%; Clout to be purity be 99.8% Fe, alloy material is mixed;
(2) vacuum induction melting is adopted, temperature 1630 DEG C, melting 1.2 hours;
(3) adopt forging molding, obtain valve blank;
(4) carry out Tempering and Quenching, namely at 800 DEG C, be incubated 1.5h, quenching, is then heated to 500 DEG C, is incubated 2 hours, last air cooling; Machining again, processing conditions is: it is spherical for impacting working head, and output terminal arc radius is 2mm, rotating speed 200r/min; The amplitude of impact head is 5 μm; Finally carry out surperficial supersound process at ambient temperature, frequency control, 3-3.5 ten thousand hertz, obtains nano surface crystalline substance;
(5) Nitrizing Treatment is carried out at 330 DEG C;
(6) milling machine processing is adopted to carry out surface smoothness process to the conical surface;
(7) at conical surface built-up welding tungsten zirconium alloy, use the online open arc automatic resurfacing welding machine of ARC-NMP7-1 type to carry out built-up welding tungsten zirconium alloy, processing parameter is: preheating temperature is 450 DEG C, and weldingvoltage is 30 volts, 900 amperes, electric current, wherein the content of tungsten is 45%, and zirconium is surplus;
(8) again carry out surface smoothness process with milling machine processing, obtain final accessory size.
Embodiment 4
Through processes inlet valves such as making Nano surface, low temperature nitriding, built-up welding tungsten zirconium alloys, concrete steps are as follows:
(1) prepare burden, weight alloy percent composition is: C:0.36%; Si:0.27%; Mo:2.95%; Mn:0.67%; Cr:0.87%; W:0.68%; Clout to be purity be 99.8% Fe, alloy material is mixed;
(2) vacuum induction melting is adopted, temperature 1600 DEG C, melting 1 hour;
(3) adopt forging molding, obtain valve blank;
(4) carry out Tempering and Quenching, namely at 825 DEG C, be incubated 1h, quenching, is then heated to 480 DEG C, is incubated 2.5 hours, last air cooling; Machining again, processing conditions is: it is spherical for impacting working head, and output terminal arc radius is 2mm, rotating speed 200r/min; The amplitude of impact head is 5 μm; Finally carry out surperficial supersound process at ambient temperature, frequency control, 3-3.5 ten thousand hertz, obtains nano surface crystalline substance;
(5) Nitrizing Treatment is carried out at 350 DEG C;
(6) milling machine processing is adopted to carry out surface smoothness process to the conical surface;
(7) at conical surface built-up welding tungsten zirconium alloy, use the online open arc automatic resurfacing welding machine of ARC-NMP7-1 type to carry out built-up welding tungsten zirconium alloy, processing parameter is: preheating temperature is 450 DEG C, and weldingvoltage is 30 volts, 900 amperes, electric current, wherein the content of tungsten is 47.5%, and zirconium is surplus;
(8) again carry out surface smoothness process with milling machine processing, obtain final accessory size.
Embodiment 5
Through processes inlet valves such as making Nano surface, low temperature nitriding, built-up welding tungsten zirconium alloys, concrete steps are as follows:
(1) prepare burden, weight alloy percent composition is: C:0.36%; Si:0.25%; Mo:2.9%; Mn:0.66%; Cr:0.97%; W:0.67%; Clout to be purity be 99.8% Fe, alloy material is mixed;
(2) vacuum induction melting is adopted, temperature 1640 DEG C, melting 1.0 hours;
(3) adopt forging molding, obtain valve blank;
(4) carry out Tempering and Quenching, namely at 850 DEG C, be incubated 1.5h, quenching, is then heated to 500 DEG C, is incubated 2 hours, last air cooling; Machining again, processing conditions is: it is spherical for impacting working head, and output terminal arc radius is 2mm, rotating speed 200r/min; The amplitude of impact head is 5 μm; Finally carry out surperficial supersound process at ambient temperature, frequency control, 3-3.5 ten thousand hertz, obtains nano surface crystalline substance;
(5) Nitrizing Treatment is carried out at 360 DEG C;
(6) milling machine processing is adopted to carry out surface smoothness process to the conical surface;
(7) at conical surface built-up welding tungsten zirconium alloy, use the online open arc automatic resurfacing welding machine of ARC-NMP7-1 type to carry out built-up welding tungsten zirconium alloy, processing parameter is: preheating temperature is 450 DEG C, and weldingvoltage is 30 volts, 900 amperes, electric current, wherein the content of tungsten is 40%, and zirconium is surplus;
(8) again carry out surface smoothness process with milling machine processing, obtain final accessory size.
Test the surface hardness of the inlet valve of above embodiment gained and comparative example (the 40Cr alloy material of modulation treatment), wear rate, fatigue strength, dynamometer life (data are in table 1), can see, hardness of the present invention, polishing machine and excelling in fatigue property, the life-span is long.
The surface hardness of table 1 material, wear rate, fatigue strength, dynamometer life
Claims (5)
1. a preparation method for inlet valve, is characterized in that, comprises following processing step:
(1) prepare batching according to alloy component range, mixed by alloy material, wherein, the alloying constituent weight percent that described inlet valve adopts is: C:0.32 ~ 0.40%; Si:0.17 ~ 0.37%; Mo:2.5 ~ 3.5%; Mn:0.50 ~ 0.80%; Cr:0.80 ~ 1.10%; W:0.50 ~ 1.0%; Surplus to be purity be 99.8% Fe, to be the impurity weight percent content in the Fe of 99.8% be described purity: Ni :≤0.030%; P :≤0.015; S :≤0.015; Cu :≤0.010%;
(2) adopt vacuum induction melting, temperature controls at 1600 ~ 1650 DEG C, melting 1 ~ 1.5 hour;
(3) adopt forging or rolling mode shaping, obtain inlet valve blank;
(4) Tempering and Quenching is carried out, then machining, surperficial supersound process, obtains nano surface crystalline substance;
(5) Nitrizing Treatment is carried out at 330 ~ 360 DEG C;
(6) milling machine processing is adopted to carry out surface smoothness process to the conical surface;
(7) at conical surface built-up welding tungsten zirconium alloy, wherein the content of tungsten is 40 ~ 60%, and zirconium is surplus;
(8) milling machine processing is adopted again to carry out surface treatment, control surface smooth finish.
2. the preparation method of inlet valve according to claim 1, is characterized in that, the step of the Tempering and Quenching in step (4) for be incubated 1-1.5h at 800-850 DEG C, quenching, then 450-500 DEG C is heated to, insulation 2-2.5 hour, last air cooling.
3. the preparation method of inlet valve according to claim 1, is characterized in that, the processing conditions of the machining described in step (4) is: it is spherical for impacting working head, and output terminal arc radius is 2mm, rotating speed 200r/min; The amplitude of impact head is 5 μm.
4. the preparation method of inlet valve according to claim 1, is characterized in that, surperficial supersound process described in step (4) be at room temperature, frequency control carries out under the condition of 3-3.5 ten thousand hertz.
5. the preparation method of inlet valve according to claim 1, is characterized in that, in step (7), the processing parameter of conical surface built-up welding tungsten zirconium alloy is: preheating at 450 DEG C, weldingvoltage is 300V, electric current 900A.
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| CN201310618611.8A CN103627961B (en) | 2013-11-27 | 2013-11-27 | Manufacturing method for air inlet valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106141576B (en) * | 2015-05-17 | 2018-08-24 | 浙江黄岩天盛汽车零部件有限公司 | A kind of motorcar engine high temperature resistant exhaust valve |
| CN107794459B (en) * | 2015-05-18 | 2019-05-24 | 南京市星淳机械有限公司 | A kind of cylinder cover of automobile engine |
| CN104831184B (en) * | 2015-05-24 | 2016-08-24 | 普创新能源动力科技有限公司 | A kind of valve for engine group |
| CN105838917B (en) * | 2015-06-02 | 2017-12-12 | 盐城中咏投资发展有限公司 | A kind of high-wearing feature generator axle sleeve |
| CN105296858A (en) * | 2015-11-11 | 2016-02-03 | 杨秋香 | High-performance engine inlet valve and preparing method thereof |
| CN107012402A (en) * | 2017-05-19 | 2017-08-04 | 成都亨通兆业精密机械有限公司 | A kind of preparation method of inlet valve |
| CN106996323A (en) * | 2017-05-19 | 2017-08-01 | 成都亨通兆业精密机械有限公司 | A kind of preparation method of exhaust valve |
| CN110242381B (en) * | 2017-05-24 | 2021-09-24 | 抚州振邦汽车服务有限公司 | Manufacturing method of intake valve for automobile engine |
| CN112318077A (en) * | 2020-11-04 | 2021-02-05 | 安福锦湖(湖南)气门有限公司 | Manufacturing method of intake valve for automobile engine |
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| EP1887096A1 (en) * | 2006-08-09 | 2008-02-13 | Rovalma, S.A. | Hot working steel |
| CN101270445B (en) * | 2007-03-23 | 2010-10-06 | 宝山钢铁股份有限公司 | Method for manufacturing fire resistant insulated tubing |
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