CN102965609A - Process of performing hypersonic flame spraying on valve rod of diesel engine gas valve - Google Patents
Process of performing hypersonic flame spraying on valve rod of diesel engine gas valve Download PDFInfo
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- CN102965609A CN102965609A CN2012105012612A CN201210501261A CN102965609A CN 102965609 A CN102965609 A CN 102965609A CN 2012105012612 A CN2012105012612 A CN 2012105012612A CN 201210501261 A CN201210501261 A CN 201210501261A CN 102965609 A CN102965609 A CN 102965609A
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Abstract
The invention discloses a process of performing hypersonic flame spraying on a valve rod of a diesel engine gas valve. The process comprises the following steps of: firstly, using a normal clearing process to carry out cleaning and abrasive blasting treatment on the surface of the valve rod of the diesel engine gas valve; subsequently, drying metal ceramic particles Cr3C2-NiCr at 50-60 DEG C, mounting the valve rod of the gas valve on a vertical-type mechanical rotating device, and spraying by using a hypersonic flame spraying apparatus, wherein the distance between a gun opening and a workpiece is 200-220mm, the oxygen pressure is 1.2-1.3Mpa, and the flow is 290-315L/min; the pressure of a propane gas is 0.65-0.75Mpa, and the flow is 75-90L/min; the nitrogen powder conveying pressure is 1.2-1.3Mpa, the flow is 15-17L/min and the powder conveying speed is 30-40g/min; the moving speed of a spraying gun is 12-15mm/s, and the rotation speed of the gas valve is 250-300 rpm; and finally, putting the sprayed valve rod of the gas valve into a hot air circulating furnace, insulating for 4-6 hours at 140-150 DEG C, and cooling in air to obtain a valve rod of a gas valve with a coating. The spraying coating has the advantages of high hardness, good combination strength, low porosity and no obvious oxide.
Description
Technical field
The present invention relates to the high-velocity spray technical field, relate in particular to a kind of technique of hypersonic flame spraying diesel valve valve rod.
Background technology
Air valve is one of critical movements part of diesel engine, as the critical movements part of diesel engine, is one of key element of overall performance naturally.In the course of the work, it bears the corrosive nature of the complex working conditions such as stretching under the comparatively high temps, frictional wear, impact, fatigue and exhaust combustion gases.Because the part that matches with air valve is many, volume greatly, very heavy again, change its needs the diesel engine disintegration, work consuming is consuming time.If in use break down, cause the parking accident, ocean marine diesel particularly, air valve lost efficacy the loss that causes will be very large.
In use safe and reliable in order to guarantee diesel engine, except air valve heart section is had sufficiently high intensity, plasticity and the toughness, also to try every possible means to make the air valve stem surface that very high hardness, wear resistance, fatigue strength and stress corrosion resistant ability must be arranged, guarantee work-ing life.In recent years, the tempo of main frame is very fast, and obviously raising of load, and this has just proposed requirements at the higher level to the air valve inner quality.How to improve air valve valve rod hardness, wear resistance, fatigue strength, solidity to corrosion, reliability and become the target that the insider studies work-ing life.
At present, after solution treatment, have above-mentioned performance in order to make the slow speed diesel engine air valve, all adopt the means that form sprayed coating at air valve stem surface spraying one deck high-temperature wearable, corrosion resistant material.Hardness is low, bonding strength is not enough, porosity is high, oxide compound is overproof but present sprayed coating often occurs.These defectives will directly cause wear resistance, solidity to corrosion, fatigue strength and the work-ing life of product not to reach design requirements, and production cost also significantly improves.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the present invention is to provide that a kind of sprayed coating hardness is high, bonding strength is good, porosity is low, without the obvious technique of the hypersonic flame spraying diesel valve valve rod of oxide compound.
The present invention seeks to realize like this: a kind of technique of hypersonic flame spraying diesel valve valve rod is characterized in that: at first with conventional cleaning process the diesel valve stem surface is cleaned and sandblasting; Then, sintering metal particle Cr3C2-NiCr is lumpd 50-60 ℃ of lower oven dry to nothing; And the air valve valve rod is installed on the vertical mechanical swivel arrangement, spray with supersonic velocity flame plating equipment, distance is 200-220mm between the spray gun muzzle of described supersonic velocity flame plating equipment and the workpiece, oxygen pressure is that 1.2-1.3Mpa, oxygen flow are 290-315L/min, propane flammable gas pressure 0.65-0.75Mpa, flow are 75-90L/min, nitrogen powder feeding pressure 1.2-1.3Mpa, flow 15-17L/min, powder feed rate 30-40g/min, spray gun translational speed 12-15mm/s, 250-300 rev/min of air valve valve rod rotating speed; At last, the air valve valve rod after the spraying is put into recirculation furnace, 140-150 ℃ of lower insulation 4-6 hour, air cooling obtained the air valve valve rod of band coating.
Adopt technique scheme, Cr
3C
2-NiCr particle is after the heating of high temperature and high speed flame stream, produce an amount of fusing at particle surface, granule interior occurs softening, these matrix metals are the also particle of undecomposed molten state of oxidized, carbide seldom, guaranteeing that hard point is not returned bullet and falls under the condition that comes off from spray-coating surface, with flank speed and matrix metal collision, and be attached on the product surface, with its generation physical bond.
At first: the present invention is by pressure and the flow of control combustion gas (propane) and combustion-supporting gas (oxygen), control on the one hand flame Flow Velocity (4-5 times of velocity of sound), so that the Cr3C2-NiCr particle speed is fast, kinetic energy is large, high with flattening degree after the workpiece collision, sprayed coating is finer and close, and the bonding strength between particle and matrix metal and particle and the particle is high, meanwhile, sprayed coating can also keep very high rigidity.On the other hand, control flame temperature (about 3000 ℃), avoid because of decompose after the too high Cr3C2-NiCr of the causing particles fuse of flame temperature, oxidation is more, avoided simultaneously because of Heating temperature lower, the fusing of Cr3C2-NiCr particle surface is not enough or not fusing, the sintering metal particle is not softened, and after the matrix collision, particle flattening degree is not enough, the grit particle partly returns bullet and comes off, thereby cause coating hardness low, bonding strength is not high, the phenomenon that hole increases.Adopt at last pressure and the flow of combustion gas of the present invention (propane) and combustion-supporting gas (oxygen), combustion gas can fully be burnt, and does not produce smog, does not cause energy dissipation.
Secondly: the present invention fully reduces degree of oxidation by adjusting the distance between muzzle and the workpiece so that the Cr3C2-NiCr particle is heated and accelerates.
At last: increase ageing treatment process after the thermospray, under the prerequisite that guarantees high rigidity, effectively reduce the tensile stress of sprayed coating, and suitably increased the bonding strength between sprayed coating and matrix and the coating.
After the aforesaid method thermospray, air valve valve rod coating hardness is 937-1058HV, porosity 0.9-1.6%, and oxide compound is few, anchoring strength of coating 66-78MPa.Sprayed coating hardness, bonding strength just because of the air valve valve rod obviously improve, and porosity significantly descends, just so that all are significantly improved in the wear resistance of whole air valve, fatigue strength, solidity to corrosion and work-ing life.
In technique scheme, the step of described cleaning be with air valve valve rod spray-coating surface with alcohol wash to without any grease, dirt, and clean out corrosion and burr.
In technique scheme, the process of described sandblast is pressurized air and the 160-240 μ m quartz sand snifting valve valve rod with 0.31Mpa, make air valve valve rod spray-coating surface reach Ra3-3.5 μ m, then clean out workpiece surface with the pressurized air of the clean 0.11Mpa of cleaning.
In technique scheme, the timed interval between described sandblast and the spraying should be less than two hours.
In technique scheme, described air valve valve rod is made by NiCr20TiAl.
In technique scheme, the particle size 10-45 μ m of described sintering metal particle Cr3C2-NiCr.
Beneficial effect: the distance when the present invention selects rational thermospray between fuel gas and combustion-supporting gas flow velocity and flow, flame velocity, flame temperature, nozzle and the workpiece and aging treatment process parameter, thus guarantee that sprayed coating hardness, bonding strength, porosity and oxide quantity meet the requirement of technical publications.
Embodiment
The present invention is described further below in conjunction with embodiment:
In the following instance, the supersonic velocity flame plating equipment model is ZB-2700, and mechanical rotary device is vertical, and the air valve stem material is NiCr20TiAl, and the sintering metal particle is Cr3C2-NiCr, particle size 10-45 μ m.
Case study on implementation 1
Comprise before the spraying three steps of ageing treatment after the pre-treatment, spraying, spraying:
First step: pre-treatment
A, cleaning with the clean grease of alcohol wash, dirt, do not allow to exist corrosion, burr with air valve valve rod spray-coating surface;
B, sandblast pressurized air and the quartzy sand blasting valve rod of 160-240 μ m of 0.31Mpa makes spray-coating surface reach Ra3-3.5 μ m;
C, cleaning are cleaned out workpiece surface with the pressurized air of the clean 0.1Mpa of cleaning.
Second step: spraying
Spray coating powder sintering metal particle Cr3C2-NiCr is lumpd in 50 ℃ of oven dry to nothing; And the air valve valve rod is installed on the vertical mechanical swivel arrangement, spray with supersonic velocity flame plating equipment, between the muzzle of the spray gun of described supersonic velocity flame plating equipment and the workpiece apart from 200mm; 10 minutes timed intervals between sandblast and the spraying, oxygen pressure 1.2Mpa, flow 290L/min, propane flammable gas pressure 0.65Mpa, flow 75L/min, nitrogen powder feeding pressure 1.2Mpa, flow 15L/min, powder feed rate 30g/min, spray gun translational speed 12mm/s, 250 rev/mins of air valve rotating speeds, the flame Flow Velocity can reach 4-5 times of velocity of sound, about 3000 ℃ of temperature.
Third step: ageing treatment
Air valve valve rod after the spraying is put into recirculation furnace, 140 ℃ of lower insulations 4 hours, air cooling, obtaining coat-thickness is the air valve valve rod of 0.2mm.
With Vickers' hardness instrumentation coating hardness, be 950-1048HV; Survey porosity and oxide content with metaloscope, porosity is 1.0%, without obvious oxide compound; Survey bonding strength with tension testing machine, be 78MPa.
Case study on implementation 2
Comprise before the spraying three steps of ageing treatment after the pre-treatment, spraying, spraying:
First step: pre-treatment
A, cleaning with the clean grease of alcohol wash, dirt, do not allow to exist corrosion, burr with the air valve spray-coating surface;
B, sandblast pressurized air and the quartzy sand blasting valve rod of 160-240 μ m of 0.38Mpa makes spray-coating surface reach Ra3-3.5 μ m;
C, cleaning are cleaned out workpiece surface with the pressurized air of the clean 0.2Mpa of cleaning.
Second step: spraying
Spray coating powder sintering metal particle Cr3C2-NiCr is lumpd in 60 ℃ of oven dry to nothing; And the air valve valve rod is installed on the vertical mechanical swivel arrangement, spray with supersonic velocity flame plating equipment, between the spray gun muzzle of described supersonic velocity flame plating equipment and the workpiece apart from 220mm; 110 minutes timed intervals between sandblast and the spraying.Be adjusted to oxygen pressure 1.3Mpa, flow 315L/min, propane flammable gas pressure 0.75Mpa, flow 90L/min, nitrogen powder feeding pressure 1.3Mpa, flow 17L/min, powder feed rate 40g/min, spray gun translational speed 15mm/s, 300 rev/mins of air valve rotating speeds, flame Flow Velocity can reach 4-5 times of velocity of sound, about 3000 ℃ of temperature.
Third step: ageing treatment
Air valve valve rod after the spraying is put into recirculation furnace, and 150 ℃ of lower insulations 6 hours, air cooling obtained the air valve valve rod that coat-thickness is 0.21mm.
With Vickers' hardness instrumentation coating hardness, be 963-1051HV; Survey porosity and oxide content with metaloscope, porosity is 1.4%, without obvious oxide compound; Survey bonding strength with tension testing machine, be 68MPa.
Embodiment 3
Comprise before the spraying three steps of ageing treatment after the pre-treatment, spraying, spraying:
First step: pre-treatment
A, cleaning with the clean grease of alcohol wash, dirt, do not allow to exist corrosion, burr with the air valve spray-coating surface;
B, sandblast pressurized air and the quartzy sand blasting valve rod of 160-240 μ m of 0.31Mpa makes spray-coating surface reach Ra3-3.5 μ m;
C, cleaning are cleaned out workpiece surface with the pressurized air of the clean 0.11Mpa of cleaning.
Second step: spraying
Spray coating powder sintering metal particle Cr3C2-NiCr is lumpd in 55 ℃ of oven dry to nothing; And the air valve valve rod is installed on the vertical mechanical swivel arrangement, spray with supersonic velocity flame plating equipment, between the spray gun muzzle of described supersonic velocity flame plating equipment and the workpiece apart from 200mm; 50 minutes timed intervals between sandblast and the spraying.Be adjusted to oxygen pressure 1.2Mpa, flow 295l/min, propane flammable gas pressure 0.68Mpa, flow 77l/min, nitrogen powder feeding pressure 1.23Mpa, flow 15.5l/min, powder feed rate 32g/min, spray gun translational speed 12mm/s, 260 rev/mins of air valve rotating speeds, flame Flow Velocity can reach 4-5 times of velocity of sound, about 3000 ℃ of temperature.
Third step: ageing treatment
Air valve after the spraying is put into recirculation furnace, and 145 ℃ of lower insulations 4.5 hours, air cooling obtained the air valve valve rod that coat-thickness is 0.19mm.
With Vickers' hardness instrumentation coating hardness, be 946-1039HV; Survey porosity and oxide content with metaloscope, porosity is 1.1%, without obvious oxide compound; Survey bonding strength with tension testing machine, be 76.5MPa.
Claims (6)
1. the technique of a hypersonic flame spraying diesel valve valve rod is characterized in that: at first with conventional cleaning process the diesel valve stem surface is cleaned and sandblasting; Then, sintering metal particle Cr3C2-NiCr is not extremely lumpd 50-60 ℃ of lower oven dry; And the air valve valve rod is installed on the vertical mechanical swivel arrangement, spray with supersonic velocity flame plating equipment, distance is 200-220mm between the spray gun muzzle of described supersonic velocity flame plating equipment and the workpiece, oxygen pressure is that 1.2-1.3Mpa, oxygen flow are 290-315L/min, propane flammable gas pressure 0.65-0.75Mpa, flow are 75-90L/min, nitrogen powder feeding pressure 1.2-1.3Mpa, flow 15-17L/min, powder feed rate 30-40g/min, spray gun translational speed 12-15mm/s, 250-300 rev/min of air valve valve rod rotating speed; At last, the air valve valve rod after the spraying is put into recirculation furnace, 140-150 ℃ of lower insulation 4-6 hour, air cooling obtained the air valve valve rod of band coating.
2. the technique of described hypersonic flame spraying diesel valve valve rod according to claim 1 is characterized in that: the step of described cleaning be with air valve valve rod spray-coating surface with alcohol wash to without any grease, dirt, and clean out corrosion and burr.
3. the technique of described hypersonic flame spraying diesel valve valve rod according to claim 1, it is characterized in that: the process of described sandblast is pressurized air and the 160-240 μ m quartz sand snifting valve valve rod with 0.31Mpa, make air valve valve rod spray-coating surface reach Ra3-3.5 μ m, then clean out workpiece surface with the pressurized air of the clean 0.11Mpa of cleaning.
4. the technique of described hypersonic flame spraying diesel valve valve rod according to claim 1, it is characterized in that: the timed interval between described sandblast and the spraying should be less than two hours.
5. the technique of each described hypersonic flame spraying diesel valve valve rod according to claim 1-4, it is characterized in that: described air valve valve rod is made by NiCr20TiAl.
6. the technique of each described hypersonic flame spraying diesel valve valve rod is characterized in that: the particle size 10-45 μ m of described sintering metal particle Cr3C2-NiCr according to claim 1-4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210501261.2A CN102965609B (en) | 2012-11-29 | 2012-11-29 | Process of performing hypersonic flame spraying on valve rod of diesel engine gas valve |
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| CN201210501261.2A CN102965609B (en) | 2012-11-29 | 2012-11-29 | Process of performing hypersonic flame spraying on valve rod of diesel engine gas valve |
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| CN102965609A true CN102965609A (en) | 2013-03-13 |
| CN102965609B CN102965609B (en) | 2014-11-26 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105525251A (en) * | 2015-12-29 | 2016-04-27 | 安徽恒意硬面工程股份有限公司 | Supersonic spraying process for sintering main shaft fan blade |
| CN105543615A (en) * | 2015-12-14 | 2016-05-04 | 无锡福镁轻合金科技有限公司 | Composite material for stop valve |
| CN107236923A (en) * | 2017-06-12 | 2017-10-10 | 中国石油集团渤海钻探工程有限公司 | Improve expansion link surface abrasion resistance method |
| CN107881456A (en) * | 2017-11-14 | 2018-04-06 | 郑媛媛 | A kind of valve rod preparation technology |
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| JPH11343564A (en) * | 1998-05-28 | 1999-12-14 | Mitsubishi Heavy Ind Ltd | High temperature equipment |
| CN1900543A (en) * | 2006-07-03 | 2007-01-24 | 藤长宽 | Use of spray process in motor regulating center bearing base inner surface |
| CN102787288A (en) * | 2012-08-21 | 2012-11-21 | 黄红霞 | Hot spraying process of metal ceramic coating on surface of valve rod |
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2012
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11343564A (en) * | 1998-05-28 | 1999-12-14 | Mitsubishi Heavy Ind Ltd | High temperature equipment |
| CN1900543A (en) * | 2006-07-03 | 2007-01-24 | 藤长宽 | Use of spray process in motor regulating center bearing base inner surface |
| CN102787288A (en) * | 2012-08-21 | 2012-11-21 | 黄红霞 | Hot spraying process of metal ceramic coating on surface of valve rod |
Non-Patent Citations (1)
| Title |
|---|
| 王洪涛等: "超音速火焰喷涂Cr3C2-NiCr涂层腐蚀冲蚀磨损特性", 《材料科学与工艺》, vol. 19, no. 6, 31 December 2011 (2011-12-31), pages 80 - 85 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105543615A (en) * | 2015-12-14 | 2016-05-04 | 无锡福镁轻合金科技有限公司 | Composite material for stop valve |
| CN105525251A (en) * | 2015-12-29 | 2016-04-27 | 安徽恒意硬面工程股份有限公司 | Supersonic spraying process for sintering main shaft fan blade |
| CN107236923A (en) * | 2017-06-12 | 2017-10-10 | 中国石油集团渤海钻探工程有限公司 | Improve expansion link surface abrasion resistance method |
| CN107881456A (en) * | 2017-11-14 | 2018-04-06 | 郑媛媛 | A kind of valve rod preparation technology |
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| CN102965609B (en) | 2014-11-26 |
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Inventor after: Ming Guojian Inventor before: Ji Qingkang Inventor before: Zhang Xianzhi Inventor before: Ming Guojian |