CN101736282A - Intermediate temperature nitriding process for alloy cast iron - Google Patents
Intermediate temperature nitriding process for alloy cast iron Download PDFInfo
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- CN101736282A CN101736282A CN200810234885A CN200810234885A CN101736282A CN 101736282 A CN101736282 A CN 101736282A CN 200810234885 A CN200810234885 A CN 200810234885A CN 200810234885 A CN200810234885 A CN 200810234885A CN 101736282 A CN101736282 A CN 101736282A
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- nitriding
- nitride layer
- nitriding process
- cast iron
- alloy cast
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Abstract
The invention provides an intermediate temperature nitriding process for alloy cast iron. A tempering working procedure is respectively added in the rough machining before the nitriding and after semifinishing. In the nitriding process, by scientifically controlling technological parameters such as temperature rise rate, heat preservation time, temperature reduction rate, ammonia dissociation rate and the like, the nitriding process is carried out in a strictly controlled state, the nitriding deformation is small and a nitride layer is uniform. A cylinder jacket after the nitriding is uniformly covered with a silver nitride layer so as to have good antirust effect and strong cave corrosion resistance; and after the nitride layer in an inner hole is polished, nitriding pocks are fewer, overlapping curves are clear, the lubricant retention property is good, the wear resistance is improved, and the oil consumption is reduced.
Description
Affiliated technical field
The present invention relates to warm nitriding treatment cylinder sleeve technology, particularly diesel cylinder cover nitrogenation treatment technology in the alloy cast iron cylinder jacke.
Background technology
Diesel cylinder cover is because of its cylinder diameter, working load, multiple reason such as quality of cooling water, the water jacket part cavitation pitting of cylinder sleeve is very much serious, it is principal mode that cavitation pitting lost efficacy, sort this problem out all is the outside surface by the nitriding treatment cylinder sleeve in the industry, but mostly cylinder liner material is graphitic cast iron, the content of carbon is higher in the graphitic cast iron, in nitridation process, the scaling loss of carbon easily forms the hole, and the crisp rigid nitride that forms after the nitrogenize is easy to come off in road, back polishing process, form pit, a large amount of pits is the major cause that cylinder sleeve in use causes engine oil consumption.
Summary of the invention
The invention provides a kind of middle temperature nitrogenation treatment technology of cast alloy iron diesel cylinder cover, this technology not only can make the anti-cavitation pitting ability of the outside surface of cylinder sleeve strengthen, hardness improves, the friction resistant performance improves, and can also alleviate the nitrogenize pit problem of cylinder sleeve, improve the work-ing life of cylinder sleeve, reduce consumption of lubricating oil.
The technical solution adopted for the present invention to solve the technical problems is that the machining before nitrogenize increases tempering process, has solved the caused change row of the stress relief of cylinder sleeve in the nitridation process, has reduced the surplus of polishing after the nitrogenize.By the processing parameters such as speed of heat-up rate, soaking time, cooling, control the ammonia decomposition of obstructed process in nitridation process, nitridation process is carried out under the state of strictness control, the nitrogenize distortion is little, and nitride layer is even.
The invention has the beneficial effects as follows, diesel cylinder cover is handled by warm nitrogenation treatment technology in this, appearance covers uniform silvery white nitride layer, favorable rust preventing effect, anti-cavitation pitting ability are strong, the nitride layer of endoporus is few through polishing back nitrogenize pit, and reticulate pattern is clear, and the oil storage performance is good, wear-resistant ability improves, and engine oil consumption reduces.
Description of drawings
The present invention is further described below in conjunction with accompanying drawing.
This accompanying drawing is the process flow sheet of nitriding treatment production cylinder sleeve.
Specific implementation method
The present invention solves the technology that its technical problem adopts: in order to ensure the quality of middle temperature nitrogenize, at first be to solve the nitrogenize problem on deformation, to carry out temper after the roughing in the machining process, eliminate roughing and hot worked internal stress, mach semi-finishing, the temper operation is set, and to eliminate mach internal stress, is finish turning cylindrical and honing endoporus then.After machining finishes, the cylinder sleeve that is up to the standards through geometrical dimension, naturally dry into stove with the strict back of cleaning of gasoline, feed ammonia being lower than under 200 ℃ the state, air in the emptying stove, slowly be warming up to 490 ℃ not to be higher than 50 ℃ of speed hourly, be incubated 4 hours, be warming up to 500 ℃, be incubated 3 hours, then with 40 ℃ cooling rate per hour, when temperature in the stove is lower than 180 ℃, stop to feed ammonia, cylinder sleeve is come out of the stove, and the cylinder sleeve of coming out of the stove is removed the nitrogenize tapetum through detecting the honing polishing of qualified back.
Claims (1)
1. warm nitrogenation treatment technology in the alloy gray cast-iron is characterized in that: slowly be warming up to 490 ℃, be incubated 4 hours, be warming up to 500 ℃, be incubated 3 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810234885A CN101736282A (en) | 2008-11-20 | 2008-11-20 | Intermediate temperature nitriding process for alloy cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810234885A CN101736282A (en) | 2008-11-20 | 2008-11-20 | Intermediate temperature nitriding process for alloy cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101736282A true CN101736282A (en) | 2010-06-16 |
Family
ID=42460308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810234885A Pending CN101736282A (en) | 2008-11-20 | 2008-11-20 | Intermediate temperature nitriding process for alloy cast iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101736282A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109518122A (en) * | 2018-12-05 | 2019-03-26 | 中国航发哈尔滨东安发动机有限公司 | The asymmetric revolution class titanium alloy component ionic nitriding control method of thin-walled large scale |
-
2008
- 2008-11-20 CN CN200810234885A patent/CN101736282A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109518122A (en) * | 2018-12-05 | 2019-03-26 | 中国航发哈尔滨东安发动机有限公司 | The asymmetric revolution class titanium alloy component ionic nitriding control method of thin-walled large scale |
| CN109518122B (en) * | 2018-12-05 | 2022-01-14 | 中国航发哈尔滨东安发动机有限公司 | Ion nitriding control method for thin-wall large-size asymmetric rotary titanium alloy part |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100616 |