CN101089203A - Hardening technology for surface alloy of gas valve of high power diesel engine - Google Patents
Hardening technology for surface alloy of gas valve of high power diesel engine Download PDFInfo
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- CN101089203A CN101089203A CN 200610027568 CN200610027568A CN101089203A CN 101089203 A CN101089203 A CN 101089203A CN 200610027568 CN200610027568 CN 200610027568 CN 200610027568 A CN200610027568 A CN 200610027568A CN 101089203 A CN101089203 A CN 101089203A
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Abstract
This invention discloses the hardening process for the surface alloy of air valve of high power diesel engine. First, the surface of the air valve is proceeded by vacuum weld deposited alloy in a vacuum furnace; so, increasing bond property between the alloy and base material of the air valve, and also decreasing looseness of weld deposited alloy, gas holes and slag inclusion. Second, the weld deposited alloy of the surface of the air valve is heated. Finally, stressing rolling is proceeded onto the alloy of the surface after being heated, so, it can be elimited that small amount of looseness and residual gas holes are remained in the alloy, increasing the density of the alloy, enhancing the combination properties of the air valve, to meet various technical requirements.
Description
One, technical field
A kind of hardening technology for surface alloy of gas valve of high power diesel engine, particularly the technology field of gas valve of high power diesel engine processing is applied to gas valve of high power diesel engine.
Two, background technology
Just at present, air valve factory generally all adopts the method for hardfacing alloy on the air valve valve face both at home and abroad, improve the work-ing life of air valve, the method of hardfacing alloy generally has oxy-acetylene welding, argon arc welding, several traditional hardfacing alloy technologies such as plasma welding, but no matter be any hardfacing alloy technology, on the air valve valve face during hardfacing alloy, all exist build-up welding alloy material loose unavoidably, pore, slag inclusion, thick and the hardfacing alloy of metallographic structure crystal grain combines major defects such as not good with the base material of air valve, and the valve face alloy rigidity is not high, we also do overtesting, on the air valve valve face, adopt the method for vacuum hardfacing alloy, attempt to solve the defective of bringing by traditional hardfacing alloy technology, test-results shows, on the air valve valve face, adopt the vacuum hardfacing alloy, compare with other several hardfacing alloy technologies, every index is significantly improved, but crystal grain is thick, the problem that hardness is not high does not solve yet, for the problems referred to above, there are a lot of R﹠D institutions and air valve manufactory to use time decades to study in the world, but all do not obtain effective way always, residual defective and improve problem such as valve face hardness of alloy when solving hardfacing alloy, therefore the quality of air valve valve face rests on the relatively low level for a long time always, so, up to now, both at home and abroad in the relevant quality control standards (QCS) of air valve valve face hardfacing alloy layer, all allow air valve valve face hardfacing alloy layer that in various degree loose arranged, pore and slag inclusion exist, the puzzlement of residual built-up welding defective when thoroughly breaking away from hardfacing alloy, some enterprise of developed country is when design novel diesel machine air valve, adopt the Nimonic80A alloy steel material of using on the aircraft engine to make air valve, adopt this method, because there is not hardfacing alloy on the valve face, residual built-up welding defective when also just not having hardfacing alloy, in this sense, this method has obtained certain effect to improving air valve valve face quality, but, only compare with build-up welding alloy material with regard to the Nimonic80A material, its performance can not show a candle to the material of hardfacing alloy, and the manufacturability of the mechanical workout of Nimonic80A material is very poor, tooling cost is very high, the price of Nimonic80A material is extremely expensive, its material cost is that 5～15 times of material of common (the hardfacing alloy layer is arranged) air valve are (so the Nimonic80A alloy steel material differs so big with the price ratio that hardfacing alloy layer air valve material is arranged, be because the material category of standard valve is many), as seen, with the Nimonic80A alloy steel material make air valve, should not best selection when considering cost performance, in real work, air valve is in high temperature for a long time, high pressure, at a high speed, make reciprocal collision movement in the high-frequency Working environment, therefore air valve becomes an easy wearing parts in the diesel engine, if it is loose to solve build-up welding alloy material residual when eliminating hardfacing alloy on the air valve valve face, pore, slag inclusion, defectives such as metallographic structure crystal grain is thick, can't improve air valve valve face quality, to shorten the work-ing life of air valve, reduced the work-ing life of diesel engine.
Three, summary of the invention
The objective of the invention is in order to improve the quality of air valve valve face, prolong the work-ing life of air valve, design is also adopted a kind of hardening technology for surface alloy of gas valve of high power diesel engine, it is characterized in that: in vacuum oven, the air valve valve face is carried out the vacuum hardfacing alloy, and the hardfacing alloy on the air valve valve face heated, 1320 ℃ of the temperature of heating are carried out afterburning roll extrusion to heated hardfacing alloy again, the pressure 200000N that the hardfacing alloy of heating is carried out roll extrusion.The positive effect of implementing this technology is: adopt the vacuum hardfacing alloy, can improve the bonding properties of the base material of hardfacing alloy and air valve, reduce loosening in the hardfacing alloy, pore and slag inclusion; Heated hardfacing alloy is carried out afterburning roll extrusion, improve the density of material of hardfacing alloy, the metallographic structure of hardfacing alloy changes white cobalt-based αGu Rongti+eutectic carbides into by the eutectic carbides of white cobalt-based αGu Rongti+be distribution of dendritic, crystal grain obtains refinement, valve face has higher hardness, hardness can improve HRC10～15, make air valve have the inaccessible technical indicator of other technologies of employing, can improve the over-all properties of air valve valve face and the work-ing life of prolongation air valve and diesel engine greatly.And the novel process of employing does not increase the cost of air valve mother metal and hardfacing alloy at all.And the over-all properties of air valve is greatly improved, and can satisfy the technical requirements of various new, old type tube air valves.
The effect comparison table
Four, embodiment
Below, the present invention is further described with the example that is fabricated to of marine diesel air valve:
In vacuum oven, diesel valve air valve valve face is carried out the vacuum hardfacing alloy, and the hardfacing alloy on the air valve valve face heated at 1320 ℃, again heated hardfacing alloy is added roll extrusion power 200000N and carry out roll extrusion, make the sclerosis of gas valve of high power diesel engine valve face alloy, the hardness after the sclerosis of valve face alloy is in HRC52～62.
Claims (3)
1. the hardening technology for surface alloy of a gas valve of high power diesel engine is characterized in that: in vacuum oven the air valve valve face is carried out the vacuum hardfacing alloy, and the hardfacing alloy on the air valve valve face is heated, more heated hardfacing alloy is carried out afterburning roll extrusion.
2. the hardening technology for surface alloy of a kind of gas valve of high power diesel engine according to claim 1 is characterized in that: to the temperature of hardfacing alloy heating in ℃ scope of normal temperature～1320.
3. the hardening technology for surface alloy of a kind of gas valve of high power diesel engine according to claim 1 is characterized in that: the hardfacing alloy that heats is carried out the pressure of roll extrusion in 5000～200000N scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100275688A CN100560751C (en) | 2006-06-12 | 2006-06-12 | Hardening technology for surface alloy of gas valve of high power diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100275688A CN100560751C (en) | 2006-06-12 | 2006-06-12 | Hardening technology for surface alloy of gas valve of high power diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101089203A true CN101089203A (en) | 2007-12-19 |
| CN100560751C CN100560751C (en) | 2009-11-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100275688A Active CN100560751C (en) | 2006-06-12 | 2006-06-12 | Hardening technology for surface alloy of gas valve of high power diesel engine |
Country Status (1)
| Country | Link |
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| CN (1) | CN100560751C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102000952A (en) * | 2010-11-11 | 2011-04-06 | 重庆跃进机械厂有限公司 | Processing method of sealing surface of exhaust valve of low-speed diesel engine |
| CN103614526A (en) * | 2013-12-05 | 2014-03-05 | 重庆跃进机械厂有限公司 | Method for hardening valve surface of gas valve of diesel engine |
| CN103670575A (en) * | 2012-08-30 | 2014-03-26 | 上海高斯通船舶配件有限公司 | Air valve used for high-power gas engine and manufacturing method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102785065B (en) * | 2012-08-31 | 2015-01-14 | 南通市电站阀门有限公司 | Process method of solving easily produced cracks in surfacing hard alloy on valve sealing surface |
-
2006
- 2006-06-12 CN CNB2006100275688A patent/CN100560751C/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102000952A (en) * | 2010-11-11 | 2011-04-06 | 重庆跃进机械厂有限公司 | Processing method of sealing surface of exhaust valve of low-speed diesel engine |
| CN102000952B (en) * | 2010-11-11 | 2012-08-01 | 重庆跃进机械厂有限公司 | Processing method of sealing surface of exhaust valve of low-speed diesel engine |
| CN103670575A (en) * | 2012-08-30 | 2014-03-26 | 上海高斯通船舶配件有限公司 | Air valve used for high-power gas engine and manufacturing method thereof |
| CN103670575B (en) * | 2012-08-30 | 2016-06-08 | 上海高斯通船舶配件有限公司 | For air valve and its preparation method of high power gas engine |
| CN103614526A (en) * | 2013-12-05 | 2014-03-05 | 重庆跃进机械厂有限公司 | Method for hardening valve surface of gas valve of diesel engine |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN100560751C (en) | 2009-11-18 |
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| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI GOLSTON SHIPPING FITTINGS CO.,LTD. Free format text: FORMER OWNER: HE CAITIAN Effective date: 20090710 |
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Effective date of registration: 20090710 Address after: Shanghai Pudong New Area Heqing town Cai Luqin Yi Cun post encoding: 201200 Applicant after: Shanghai Golston Shipping Fittings Co., Ltd. Address before: Room 401, room 12, Lane 2938, Huaxia East Road, Shanghai, Pudong New Area: 201201 Applicant before: Ho Chi Tian Co-applicant before: He Bin |
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