CN102000952B - Processing method of sealing surface of exhaust valve of low-speed diesel engine - Google Patents
Processing method of sealing surface of exhaust valve of low-speed diesel engine Download PDFInfo
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- CN102000952B CN102000952B CN2010105391501A CN201010539150A CN102000952B CN 102000952 B CN102000952 B CN 102000952B CN 2010105391501 A CN2010105391501 A CN 2010105391501A CN 201010539150 A CN201010539150 A CN 201010539150A CN 102000952 B CN102000952 B CN 102000952B
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Abstract
The invention discloses a processing method of a sealing surface of an exhaust valve of a low-speed diesel engine, which is characterized in that a deformed and high-temperature Ni-Cr precipitation-hardening alloy containing Nb is utilized to be overlaid in a ring groove of the exhaust valve, and a reticular precipitation tissue with hardness of HV10540-580 is formed through rolling and aging precipitation-hardening processing. By the method, the hardness of the sealing surface is improved; and when in use, the sealing surface has small possibility of cracking, the production cost is controlled effectively, major repair time of the diesel engine is prolonged, and the method has a wide promotion value and market prospect.
Description
Technical field
The invention belongs to the production method of low-speed diesel engine air bleeding valve, concretely, is a kind of method of processing the low-speed diesel engine exhausting valve sealing surface.
Background technology
Low-speed diesel engine is because function admirable, good reliability, and characteristics such as working service is convenient, can use fuel oil inferior, and fuel consume is low are used as the major impetus of world's large ship.Air bleeding valve is the critical of diesel engine heart, is determining the performance and the reliability of diesel engine: be again the basic components of diesel engine, Diesel Engine Complete Machine is played crucial supporting role; Easy consumption parts especially, the diesel engine that need partly disintegrate during replacing, the consumption worker is consuming time, if in use break down, must cause the parking accident, and this is absolute unallowed appearance.
China is also quite backward at the design and the manufacture view of low-speed diesel engine air bleeding valve, relies on import always, and procurement cycle is long, and costs an arm and a leg.At present, China adopts spray (heap) welder skill, weldering layer of Ni Cr12B or Stellite 6# alloy to the low-speed diesel engine air bleeding valve conical surface; To improve the case hardness of low-speed diesel engine exhausting valve sealing surface; Increase wearability, still, it is limited leaning on built-up welding to improve sealing surface hardness fully.Last century Mo, the air bleeding valve that whole nickel base superalloy is made, after using on the two-stroke diesel engine, the overhaul phase easily surpasses 20000 hours, but whole nickel base superalloy manufacturing cost is expensive, and utilization has certain limitation on market.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of low cost of manufacture, can greatly improves the hardness of sealing surface simultaneously, and the processing method that is difficult for cracking.
For solving above technical problem, the processing method of low-speed diesel engine exhausting valve sealing surface provided by the invention has hoop conical socket (2) on the taper seat (1a) of said air bleeding valve (1), the steps include:
A) will contain Nb distortion high temperature Ni-Cr alloy welding deposit in described conical socket (2), until described conical socket (2) is filled up;
B) the hardfacing alloy face being carried out turning processing makes it flush with taper seat (1a);
C) the hardfacing alloy face is carried out rolling and processing, forming the degree of depth is the three or four road grooves (3) of 2～2.5mm, and the distance of adjacent trenches (3) corresponding position is 6 ± 0.5mm;
D) place 600～720 ℃ high temperature furnace to carry out the secondary ageing cure process said air bleeding valve (1);
E) once more taper seat and hardfacing alloy face are carried out turning processing until the sealing cone that described groove (3) is scabbled the said air bleeding valve of formation (1), and carry out dye-penetrant inspection and detect and Hardness Surveillance.
Utilization of the present invention contains Nb (niobium) distortion high temperature Ni-Cr (nickel-chromium) precipitation hardening alloy, through roll extrusion+aging precipitation cure process, forms a kind of netted deposition tissue, and hardness can reach HV
10540～580 (HV
10The hardness number that records for 10kg load).Under the situation that keeps former low-speed machine air bleeding valve matrix material SNCrW; To contain Nb distortion high temperature Ni-Cr alloy welding deposit in low-speed machine air bleeding valve conical socket; Through turning, under roll unit, the hardfacing alloy face is carried out roll extrusion forcefully then, pass through 600-720 ℃ of secondary ageing cure process again; Improve the overlay cladding case hardness, sealing surface resistance to wears and corrosive nature to improve.The air bleeding valve that this process is produced has formed extruding force at the hardfacing alloy layer, even if there is weld defect, the existence of extruding force can effectively prevent the sealing surface crackle that sealing surface impression in use occurs and produces because of combustion process.
The processing method of above-mentioned low-speed diesel engine exhausting valve sealing surface; The roll unit axial carrying load >=15t that rolling and processing adopted described in the step c); Roll extrusion linear velocity >=50m/min, the roller outer rim of this roll unit is 90 ° of angles of symmetry, and the angle top is the rounding of R2.5.
The processing method of above-mentioned low-speed diesel engine exhausting valve sealing surface, said roll unit near groove (3) the beginning roll extrusion of said air bleeding valve axis, could the contiguous next groove (3) of roll extrusion behind the intact last groove (3) of roll extrusion.
The processing method of above-mentioned low-speed diesel engine exhausting valve sealing surface is at first smeared lubricating grease on the roller rounding of said roll unit, restart roll unit, and the initial pressure≤2T of roll unit whenever increased the pressure of 2T and smeared lubricating grease one time at a distance from 30 seconds.Smear lubricating grease to reduce friction, reduce the heat in the process; Because the plastic deformation on hardfacing alloy face surface receives time effects, the pressure on the roll unit will change in time and reduce gradually, pressurize gradually according to the increase of roll extrusion gash depth.
The processing method of above-mentioned low-speed diesel engine exhausting valve sealing surface; Employing contains Nb distortion high temperature Ni-Cr alloy material GH4169, and the phase I holding temperature of the cure process of secondary ageing described in the step d) is 720 ℃, 8 hours retention times; Furnace temperature is cooled to 620 ℃; The second stage holding temperature is 620 ℃, and 8 hours retention times, furnace temperature is cooled to below 400 ℃.
The processing method of above-mentioned low-speed diesel engine exhausting valve sealing surface; Employing contains Nb distortion high temperature Ni-Cr alloy material Inconel 718, and the phase I holding temperature of the cure process of secondary ageing described in the step d) is 720 ℃, 8 hours retention times; Furnace temperature is cooled to 620 ℃; The second stage holding temperature is 620 ℃, and 6 hours retention times, furnace temperature is cooled to below 400 ℃.
Beneficial effect of the present invention: improved the hardness of sealing surface, in use be difficult for cracking, manufacturing cost has obtained effective control, has prolonged time overhaul phase of diesel engine, has wide promotional value and market prospects.
Description of drawings
Fig. 1 is the structural representation of low-speed machine air bleeding valve among the present invention.
Fig. 2 is the local amplification profile (before the built-up welding) of A among Fig. 1;
Fig. 3 is the local amplification profile (after the roll extrusion) of A among Fig. 1;
Fig. 4 is the shape and the roll extrusion sketch map of rolling tools among the present invention.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further:
Low-speed diesel engine air bleeding valve 1 as shown in Figure 1 is along its axis left-right symmetric.As shown in Figure 2, the big end of air bleeding valve 1 is taper seat 1a, has hoop conical socket 2 on the taper seat 1a, and the structure before its version and the traditional built-up welding is identical, and the matrix material of air bleeding valve 1 is SNCrW.
Embodiment 1:
A) will contain Nb distortion high temperature Ni-Cr alloy material GH4169 built-up welding in conical socket 2, until conical socket 2 is filled up;
B) the hardfacing alloy face is irregular surface, need carry out turning processing to it, and the hardfacing alloy face is flushed with the taper seat 1a of air bleeding valve 1, is beneficial to follow-up rolling and processing;
C) the hardfacing alloy face is carried out rolling and processing, forming the degree of depth is the three road grooves of 2～2.5mm, and the distance of adjacent trenches 3 corresponding positions is 6 ± 0.5mm;
The roll unit that rolling and processing adopted has turntable, rolling tools, hydraulic press, and equipment axis is to bearing load >=15t, roll extrusion linear velocity >=50m/min; It is the swing roller of φ 160mm that rolling tools adopt diameter; The roller outer rim is 90 ° of angles of symmetry, and the angle top is the rounding of R2.5, rotating speed 50～400rpm; The minimum requirements of turntable driving power is 7.5KW, and the roller outer rim shape of rolling tools is corresponding with the shape of groove 3.
Before the roll extrusion,, at first on the roller rounding of roll unit, smear lubricating grease, have the material of lubricant effect, restart roll unit like molybdenum bisuphide or other for the friction of roller and hardfacing alloy face in the minimizing roll extrusion process.The degree of depth of supposing the roll extrusion groove is 2.2mm, and the initial pressure of roll unit is T, in the roll extrusion process, whenever increases the pressure of 2T and smears lubricating grease one time at a distance from 30 seconds.When being rolled into the 2.2mm degree of depth, the final pressure of roll extrusion is 9T.Because the plastic deformation of hardfacing alloy face receives time effects, the pressure on the rolling tools will change in time and reduce gradually.In case reach final pressure, constantly the adjustment final pressure perhaps uses an automatic voltage regulating system in 1 minute.
As shown in Figure 4, the quantity of groove 3 is three, roll unit near the groove 3 beginning roll extrusion of air bleeding valve 1 axis, could the contiguous next groove 3 of roll extrusion behind the intact last groove 3 of roll extrusion.The quantity of groove 3 also can be four.
D) place high temperature furnace to carry out the secondary ageing cure process air bleeding valve 1.The phase I holding temperature of secondary ageing cure process is 720 ℃, and 8 hours retention times, furnace temperature is cooled to 620 ℃, and the second stage holding temperature is 620 ℃, and 8 hours retention times, furnace temperature is cooled to below 400 ℃.
E) once more taper seat and hardfacing alloy face are carried out turning processing until groove 3 being scabbled the sealing cone that forms air bleeding valve; Be that taper seat and hardfacing alloy face are positioned on the same plane and groove 3 has not existed, the sealing cone of air bleeding valve is than the low 2～2.5mm of taper seat 1a of former air bleeding valve 1; Carrying out dye-penetrant inspection again detects and Hardness Surveillance.
Hardness Surveillance: in the sampling of hardfacing alloy layer, its case hardness is HV
10580, obviously be superior to adopting NiCr12B and Stellite 6# alloy to form sealing surface case hardness HV in the past
10480～520.
Metallographic structure check: the hardfacing alloy layer is carried out metallographic examination, the obvious refinement of crystal grain, grain size can reach more than 10 grades, is superior to the as-cast structure after the built-up welding in the past.
The stress state check: overlay cladding is deposited compressive stress state.
Embodiment 2:
Employing contains Nb distortion high temperature Ni-Cr alloy material Inconel 718; There is small difference in alloy material Inconel 718 with the composition of GH4169; The alloy material that domestic general employing code name is GH4169, external general employing code name is the alloy material of Inconel 718.The roll unit of its method step and use is compared with embodiment, and main difference is the secondary ageing cure process process in the step d).The phase I holding temperature that adopts alloy material Inconel 718 to carry out the secondary ageing cure process is 720 ℃, and 8 hours retention times, furnace temperature is cooled to 620 ℃, and the second stage holding temperature is 620 ℃, and 6 hours retention times, furnace temperature is cooled to below 400 ℃.
Claims (6)
1. the processing method of a low-speed diesel engine exhausting valve sealing surface has hoop conical socket (2) on the taper seat (1a) of said air bleeding valve (1), the steps include:
A) will contain Nb distortion high temperature Ni-Cr alloy welding deposit in described conical socket (2), until described conical socket (2) is filled up;
B) the hardfacing alloy face being carried out turning processing makes it flush with taper seat (1a);
C) the hardfacing alloy face is carried out rolling and processing, forming the degree of depth is the three or four road grooves (3) of 2～2.5mm, and the distance of adjacent trenches (3) corresponding position is 6 ± 0.5mm;
D) place 600～720 ℃ high temperature furnace to carry out the secondary ageing cure process said air bleeding valve (1);
E) once more taper seat and hardfacing alloy face are carried out turning processing until the sealing cone that described groove (3) is scabbled the said air bleeding valve of formation (1), and carry out dye-penetrant inspection and detect and Hardness Surveillance.
2. according to the processing method of the described low-speed diesel engine exhausting valve sealing surface of claim 1; It is characterized in that: the roll unit axial carrying load >=15t that rolling and processing adopted described in the step c); Roll extrusion linear velocity >=50m/min; The roller outer rim of this roll unit is 90 ° of angles of symmetry, and the angle top is the rounding of R2.5.
3. according to the processing method of the described low-speed diesel engine exhausting valve sealing surface of claim 2; It is characterized in that: said roll unit near groove (3) the beginning roll extrusion of said air bleeding valve (1) axis, could the contiguous next groove (3) of roll extrusion behind the intact last groove (3) of roll extrusion.
4. according to the processing method of claim 2 or 3 described low-speed diesel engine exhausting valve sealing surfaces; It is characterized in that: at first on the roller rounding of said roll unit, smear lubricating grease; Restart roll unit; Initial pressure≤the 2T of roll unit whenever increased the pressure of 2T and smeared lubricating grease one time at a distance from 30 seconds.
5. according to the processing method of the described low-speed diesel engine exhausting valve sealing surface of claim 1; It is characterized in that: adopt to contain Nb distortion high temperature Ni-Cr alloy material GH4169, the phase I holding temperature of the cure process of secondary ageing described in the step d) is 720 ℃, 8 hours retention times; Furnace temperature is cooled to 620 ℃; The second stage holding temperature is 620 ℃, and 8 hours retention times, furnace temperature is cooled to below 400 ℃.
6. according to the processing method of the described low-speed diesel engine exhausting valve sealing surface of claim 1; It is characterized in that: adopt to contain Nb distortion high temperature Ni-Cr alloy material Inconel 718, the phase I holding temperature of the cure process of secondary ageing described in the step d) is 720 ℃, 8 hours retention times; Furnace temperature is cooled to 620 ℃; The second stage holding temperature is 620 ℃, and 6 hours retention times, furnace temperature is cooled to below 400 ℃.
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| CN2010105391501A CN102000952B (en) | 2010-11-11 | 2010-11-11 | Processing method of sealing surface of exhaust valve of low-speed diesel engine |
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| CN2010105391501A CN102000952B (en) | 2010-11-11 | 2010-11-11 | Processing method of sealing surface of exhaust valve of low-speed diesel engine |
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| CN102000952B true CN102000952B (en) | 2012-08-01 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102626852A (en) * | 2012-04-28 | 2012-08-08 | 山东华云机电科技有限公司 | Supersonic machining method for conical surface of engine valve retainer |
| CN103302453B (en) * | 2013-06-07 | 2015-06-10 | 浙江坤博机械制造有限公司 | Machining method for valve body of low temperature resistance hard seal check valve |
| CN103614526B (en) * | 2013-12-05 | 2015-07-15 | 重庆跃进机械厂有限公司 | Method for hardening valve surface of gas valve of diesel engine |
| CN105983814B (en) * | 2015-03-05 | 2017-11-07 | 宁夏巨能机器人系统有限公司 | A kind of manufacture craft of mechanical hand loading arm |
| CN105215624A (en) * | 2015-09-09 | 2016-01-06 | 成都华西堂阀门制造有限公司 | Cooling rolled-on method in Tong Gui Trace |
| CN105729069A (en) * | 2016-03-25 | 2016-07-06 | 江苏星河阀门有限公司 | Machining method of multi-conical surface valve base structure of high-temperature and high-pressure check valve body |
| 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 |
| CN107984376A (en) * | 2016-10-27 | 2018-05-04 | 无锡威孚施密特动力系统零部件有限公司 | A kind of high pressure gasoline pipe heading sealing area rolling glossing |
| CN109304407B (en) * | 2018-12-04 | 2020-11-06 | 中国航发贵州红林航空动力控制科技有限公司 | Punch forming method for valve seat sealing ring belt |
| CN112439973A (en) * | 2020-11-20 | 2021-03-05 | 江苏核电有限公司 | Repair method for surfacing layer on sealing surface of Russian gate |
| CN113020763A (en) * | 2021-03-12 | 2021-06-25 | 潍柴动力股份有限公司 | Valve surfacing welding method and valve part |
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| CN1916376A (en) * | 2006-08-30 | 2007-02-21 | 镇江维纳特气门有限公司 | Method for fabricating sealing surface of air valve |
| CN101089203A (en) * | 2006-06-12 | 2007-12-19 | 何才田 | Hardening technology for surface alloy of gas valve of high power diesel engine |
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| US8124007B2 (en) * | 2006-02-16 | 2012-02-28 | Stoody Company | Stainless steel weld overlays with enhanced wear resistance |
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| GB1463843A (en) * | 1973-07-02 | 1977-02-09 | Stoody Co | Method of valve 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 |
| CN1916376A (en) * | 2006-08-30 | 2007-02-21 | 镇江维纳特气门有限公司 | Method for fabricating sealing surface of air valve |
Non-Patent Citations (1)
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