CN103670575B - For air valve and its preparation method of high power gas engine - Google Patents
For air valve and its preparation method of high power gas engine Download PDFInfo
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- CN103670575B CN103670575B CN201210315219.1A CN201210315219A CN103670575B CN 103670575 B CN103670575 B CN 103670575B CN 201210315219 A CN201210315219 A CN 201210315219A CN 103670575 B CN103670575 B CN 103670575B
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Abstract
The present invention relates to a kind of air valve for high power gas engine and its preparation method, this air valve comprises air valve neck, valve disc and connects the air valve sealing face of the described periphery of air valve neck and the periphery of valve disc; Wherein, described air valve sealing face is the hardness formed through built-up welding superalloy and heating roll extrusion is the air valve sealing face of more than HV700; Connecting for connecting without the arc at point angle of the periphery of described air valve sealing face and described valve disc. The air valve of the present invention is high temperature resistant, wear-resisting, corrosion-resistant, high temperature fatigue resistance performance is good, is especially suitable for high power gas engine.
Description
Technical field
The present invention relates to engine fittings, in particular for air valve and its preparation method of high power gas engine.
Background technology
Along with industry is fast-developing, the industrial flammable tail gas that every profession and trade produces also gets more and more, as heap etc. filled out by colliery, coal mine gas, brewery, paper mill, rubbish, the inflammable gas overwhelming majority is all directly discharged, causing severe contamination and potential safety hazard and energy dissipation, accelerating exploitation, to adapt to every inflammable gas heavy duty (gas engine) be state key support project.
But, compared to fuel engines, such as diesel motor, the exhaust temperature of gas engine, generally higher than fuel engines, such as, at about 200 DEG C, is dry grinded when adding work, so conventional fuel oil air valve cannot meet high-performance gas engine service requirements, namely, requiring the air valve of gas engine, especially vent valve to be adopted more wear-resisting, high temperature resistant material, cost this seriously restriction high power gas engine development and use higher. In addition, gas engine is relative to fuel engines, and often inlet air temperature is higher, owing to the intake valve of gas engine is due to the dry grinding of combustion gas, abrasion is also relatively serious, and therefore the high thermal resistance of material and wear resistance be it is also proposed higher requirement by the intake valve of gas engine.
At present, the research of the air valve for high power gas engine is mainly concentrated on the performance of Wear-resistant, high-temperature resistant is studied. The open a kind of Austenitic Alloy Steel of such as CN101497970A, in order to resist the corrosion of high loading combustion gas.
Summary of the invention
In the face of the problems referred to above that prior art exists, the present inventor is conceived to improve the geometrical shape of the existing air valve for fuel engines of the applicant, it is made to be largely increased in the property such as high temperature resistant, wear-resisting, corrosion-resistant, high temperature fatigue resistance, so that it can be used for gas engine, especially high-power gas engine.
At this, the present invention provides a kind of air valve for high power gas engine, comprises air valve neck, valve disc and connects the air valve sealing face of the described periphery of air valve neck and the periphery of valve disc; Wherein, described air valve sealing face is the hardness formed through built-up welding superalloy and heating roll extrusion is the air valve sealing face of more than HV700; The connection of the periphery of described air valve sealing face and described valve disc is that arc connects; And the bottom surface of described valve disc is configured to circular arc.
First, the hardness that the present invention is formed through built-up welding superalloy and heating roll extrusion by adopting is the air valve sealing face of more than HV700, it is not necessary to special high temperature material, cost is lower.
Secondly, the connection of the periphery of air valve sealing face of the present invention and valve disc is that arc connects; And the bottom surface of valve disc is configured to circular arc. Namely the present invention is by changing the geometrical shape of air valve, makes the connection between these air valve components be all the smooth connection without point angle, makes the exhaust of air valve and/or air inlet more smooth and easy, thus can reduce exhaust temperature. On the contrary, the connection (see Fig. 1) between existing air valve component, such as air valve sealing face 1 (the work conical surface) often forms point angle 6 with the bottom surface 4 of valve disc 2, it is easy to hinder the flowing of exhaust.
In addition, the bottom surface of valve disc is configured to circular arc, compared with the bottom surface (see Fig. 1) of the valve disc of the existing air valve being generally plane, reduces heat energy and assembles, strengthen high-temperature behavior, it is to increase radiating effect, is conducive to the temperature of lower air valve.
Goodly, the air valve of the present invention is particularly useful for vent valve and intake valve. Exhaust temperature is usually higher, and relative and intake valve, vent valve is higher to requirement high temperature resistant, wear-resisting, corrosion-resistant, high temperature fatigue resistance. And gas engine is relative to fuel engines, owing to the intake valve of gas engine is dry grinded, loss is also relatively serious, and therefore the wear resistance of material be it is also proposed higher requirement by the intake valve of gas engine.
Preferably, the connection of the periphery of described air valve sealing face and described valve disc is the smooth connection without point angle. This makes the air-flow in air valve more level and smooth, smooth and easy further.
Again, superalloy used in the present invention can be nickel ferrochrome superalloy or stellite (Stellite). Material of the present invention is conventional material, it is applicable to sizable application.
On the other hand, the present invention also provides a kind of method preparing the above-mentioned air valve for high power gas engine, comprise: at the trim part built-up welding nickel superalloy of described air valve as described air valve sealing face, then described air valve sealing face is carried out heating roll extrusion and makes its hardness reach more than HV700; And the periphery in described air valve sealing face and valve disc is carried out surface rolling so that being connected between air valve sealing face and the periphery of valve disc for the smooth connection without point angle.
The method of the present invention processes, by built-up welding and heating roll extrusion, the air valve sealing face that hardness can be provided high, and make, by surface rolling process, the air-flow that the connection between each parts of air valve is the more smooth transition of Wu Jianjiao and can make to flow wherein, especially make evacuation circuit more smooth and easy, reduce long-pending carbon, thus improve the performance such as high temperature resistant, wear-resisting, corrosion-resistant, high temperature fatigue resistance of air valve.
Preferably, also comprise and described air valve neck is carried out surface rolling so that being the smooth connection without point angle between described air valve neck and air valve sealing face.
Again, in the present invention, the normal temperature roll extrusion that described surface rolling carries out after being included in described built-up welding, and described after normal temperature roll extrusion, described air valve sealing face is carried out heating roll extrusion. Carry out heating roll extrusion after first material can being made to reach certain degree of hardness by normal temperature roll extrusion so again, production cost can be reduced like this, and high hot rolling effect can be improved.
Again, the method for the present invention be also included in described air valve sealing face is carried out heating roll extrusion after described air valve sealing face carried out hardening thermal treatment. This can further improve the hardness of valve face.
Again, in the present invention, also connecting for the smooth connection without point angle between the periphery of valve disc and bottom surface is also made by surface rolling.
In a preferred example of the present invention, periphery and bottom surface to described air valve neck, air valve sealing face and valve disc carry out continuous surface roll extrusion. Adopt continuous surface roll extrusion so that it is it is equally bright and clean that surfaceness reaches minute surface, can guarantee that the connection between the parts formed is in smoothing junction without point angle, and roll extrusion can adopt single rolling device to carry out continuously continuously, can Simplified flowsheet.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of existing air valve;
Fig. 2 is the schematic diagram of the example air valve of the present invention;
Fig. 3 is the schematic diagram of an example air valve again of the present invention;
Fig. 4 is the partial enlargement figure illustrating air valve surfacing part of the present invention;
Fig. 5 illustrates surfacing hardness detected result contrast before and after high hot rolling;
Fig. 6 illustrates the crystalline phase tissue of overlay cladding before and after high hot rolling.
Nomenclature:
1 air valve sealing face;
2 valve discs;
3 air valve necks;
The periphery of 4 valve discs;
The bottom surface of 5 valve discs;
6 point angles;
7 surfacing parts.
Embodiment
With reference to Figure of description, and the present invention is described with the following embodiments further, it should be understood that following enforcement mode is only for illustration of the present invention, and unrestricted the present invention.
The present invention, our company's fuel engines air valve manufacture for many years obtain on multinomial roll extrusion patented technology basis combining, gas engine air valve manufacture is organically combined and is further improved air valve geometrical shape, the performances such as it is high temperature resistant, wear-resisting, high temperature resistance fatigue strength are greatly improved, and when product uses, burn soot declines to a great extent.
See Fig. 1 and 2, air valve, especially vent valve, comprise air valve sealing face 1, valve disc 2 and air valve neck 3. Air valve sealing face 1 connects periphery 4 and the air valve neck 3 of valve disc 2.
See Fig. 1, it illustrates the schematic diagram of existing air valve, and wherein air valve sealing face 1 forms a sharp angle 6 with the periphery 4 of valve disc 2, and the bottom surface 5 of valve disc 2 is a plane.
See Fig. 2, it illustrates the schematic diagram of the air valve of the present invention, wherein smoothly is connected to air valve sealing face 1 non-angular the periphery 4 of valve disc 2. The bottom surface 5 of valve disc 2 is arc. In addition, see Fig. 3, the periphery 4 of valve disc 2 and bottom surface 5 can be the smooth connection of non-angular, and the periphery 4 and 5 of such valve disc 2 is integrally formed an arc or sphere.
The preparation technology of the valve body of the present invention is simply described below:
First carrying out built-up welding as air valve sealing face 1 build-up welding alloy material at surfacing part 7 (air valve sealing face position, see Fig. 4) with nickel ferrochrome superalloy, after built-up welding, hardness is that HV260��280 are softer. Although adopt nickel ferrochrome superalloy here, but should to understand other suitable superalloys be also applicable, such as stellite.
Then air valve sealing face 1 is carried out normal temperature surface degree of depth roll extrusion (normal temperature roll extrusion), it is rolled into after we want hardness, carry out heating roll extrusion again, carry out age hardening thermal treatment again, last surface hardness can reach more than HV700 (carrying out hardness determination according to MAN company technical specifications, its result is see Fig. 5, it is seen that substantially increase surface hardness), it will be understood that normal temperature roll extrusion can not be carried out and directly carries out heating roll extrusion process.
Seeing table 1, it illustrates that the too vertical 12# of employing department is as build-up welding alloy material, and the valve face hardness gradient before and after height hot rolling of the present invention process, therefrom it will be seen that high hot rolling not only increases surface hardness, also improves the hardness of whole weldering layer:
Table 1:
After high hot rolling, hardfacing alloy layer toughness also improves greatly. Carry out thermal shocking simultaneous test according to MAN company technical specifications, and improve temperature further and continue test, the results are shown in Table 2. This it appears that by, after roll extrusion, high temperature thermal shocking performance improves more than 200 DEG C.
Table 2: air valve Stellite alloy hardened layer thermal shock test
Name of product: CW200 air valve, test condition normal temperature water-cooled
Note: in table 2, temperature columns mileage word is cracking, 0 expression is not ftractureed.
After high hot rolling, the metallographic structure of hardfacing alloy layer occurs significantly to change. Before roll extrusion, metallographic structure is carbide, the grain fineness number 9 grades of long dendroid distribution, and after roll extrusion, even net distribution carbide, grain fineness number 12 grades (see Fig. 6) are changed in metallographic structure.
Finally periphery 4 and bottom surface 5 to air valve neck 3, air valve sealing face 1, valve disc 2 carries out surface rolling. Top layer metallographic structure can be changed so on the one hand, improve surfaceness and can reach minute surface, strengthen product stress, improve fatigue strength, the original geometrical shape of air valve can be changed on the other hand, such as, relative to existing air valve by surface rolling, the bottom surface 4 of valve disc can be made into arc (see Fig. 2), such as great circle arc sphere (see Fig. 3) from plane (see Fig. 1). Like this, increase the area of the bottom surface 4 of valve disc, radiating effect can be improved. Exception, air valve sealing face 1 can be made without the smooth connection (such as arc connection) at point angle to the periphery of valve disc by surface rolling, namely, the sharp angle 6 become that prior art air valve sealing face 1 and the periphery 4 of valve disc 2 are formed can be made into small round corner transition, make its vent valve more smooth and easy, reduce exhaust valve temperature. Moreover, also can make the connection between the periphery 4 of valve disc 2 and bottom surface 5 also by surface rolling is the smooth connection without point angle, and this exhaust wherein flowed is more smooth.
The air valve of the present invention, except above-mentioned air valve sealing face 1, valve disc 2 and air valve neck 3, also can possess the parts that general air valve possesses, such as air valve bar (not shown). Not relating to the technical problem of the solution used of the present invention due to these parts, be not repeated here, those skilled in the art can consult prior art and learn.
It will be understood that the air valve of the present invention is preferably used as vent valve, but also can be used as intake valve. The air valve of the present invention can be used for high-power gas engine, such as automobile gas engine and marine engines etc., it is possible to for diesel motor to provide high performance diesel motor.
Claims (8)
1. the method for the preparation of the air valve of high power gas engine, it is characterised in that, described air valve comprises air valve neck, valve disc and connects the air valve sealing face of the described periphery of air valve neck and the periphery of valve disc; Wherein, described air valve sealing face is the hardness formed through built-up welding superalloy and heating roll extrusion is the air valve sealing face of more than HV700; Connecting for connecting without the arc at point angle of the periphery of described air valve sealing face and described valve disc, described method comprises:
At the trim part built-up welding nickel superalloy of described air valve as described air valve sealing face, then described air valve sealing face carries out heating roll extrusion and makes described trim reaches more than HV500 apart from the weldering layer hardness within 2 millimeters, surface; And
The periphery in described air valve sealing face and valve disc is carried out surface rolling so that being connected between air valve sealing face and the periphery of valve disc for the smooth connection without point angle.
2. method according to claim 1, it is characterised in that, also comprise and described air valve neck is carried out surface rolling so that being the smooth connection without point angle between described air valve neck and air valve sealing face.
3. method according to claim 1, it is characterised in that, the normal temperature roll extrusion that described surface rolling carries out after being included in described built-up welding, and after described normal temperature roll extrusion, described air valve sealing face is carried out heating roll extrusion.
4. method according to claim 1, it is characterised in that, also it is included in and after described air valve sealing face is carried out heating roll extrusion, described air valve sealing face is carried out hardening thermal treatment.
5. method according to claim 1, it is characterised in that, also comprise the bottom surface to described valve disc and carry out surface rolling so that connecting for the smooth connection without point angle between the periphery of valve disc and bottom surface.
6. method according to claim 1, it is characterised in that, periphery and bottom surface to described air valve neck, air valve sealing face and valve disc carry out continuous surface roll extrusion.
7. method according to claim 1, it is characterised in that, described air valve is vent valve or intake valve.
8. method according to claim 1, it is characterised in that, the bottom surface of described valve disc is configured to circular arc.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210315219.1A CN103670575B (en) | 2012-08-30 | 2012-08-30 | For air valve and its preparation method of high power gas engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210315219.1A CN103670575B (en) | 2012-08-30 | 2012-08-30 | For air valve and its preparation method of high power gas engine |
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| CN103670575A CN103670575A (en) | 2014-03-26 |
| CN103670575B true CN103670575B (en) | 2016-06-08 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014013503A1 (en) * | 2014-09-11 | 2016-03-17 | Man Truck & Bus Ag | Valve for an internal combustion engine |
| CN106112205A (en) * | 2016-07-15 | 2016-11-16 | 南京国际船舶设备配件有限公司 | A kind of marine diesel air valve valve disc and full cladding hardfacing alloy technique thereof |
| JP7063246B2 (en) * | 2018-11-15 | 2022-05-09 | トヨタ自動車株式会社 | Internal combustion engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60111007A (en) * | 1983-11-21 | 1985-06-17 | Kawasaki Heavy Ind Ltd | Exhaust valve and its manufacture for internal- combustion engine |
| JPS6234690A (en) * | 1985-08-06 | 1987-02-14 | Toyota Motor Corp | Engine valve for automobile and its production |
| CN101089203A (en) * | 2006-06-12 | 2007-12-19 | 何才田 | Hardening technology for surface alloy of gas valve of high power diesel engine |
| WO2011073510A1 (en) * | 2009-12-16 | 2011-06-23 | Wärtsilä Finland Oy | Internal combustion piston engine assembly |
| CN202883034U (en) * | 2012-08-30 | 2013-04-17 | 上海高斯通船舶配件有限公司 | Air valve for high-power gas engine |
-
2012
- 2012-08-30 CN CN201210315219.1A patent/CN103670575B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60111007A (en) * | 1983-11-21 | 1985-06-17 | Kawasaki Heavy Ind Ltd | Exhaust valve and its manufacture for internal- combustion engine |
| JPS6234690A (en) * | 1985-08-06 | 1987-02-14 | Toyota Motor Corp | Engine valve for automobile and its production |
| CN101089203A (en) * | 2006-06-12 | 2007-12-19 | 何才田 | Hardening technology for surface alloy of gas valve of high power diesel engine |
| WO2011073510A1 (en) * | 2009-12-16 | 2011-06-23 | Wärtsilä Finland Oy | Internal combustion piston engine assembly |
| CN202883034U (en) * | 2012-08-30 | 2013-04-17 | 上海高斯通船舶配件有限公司 | Air valve for high-power gas engine |
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| CN103670575A (en) | 2014-03-26 |
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