CN103255406A - Surface treatment method of round steel camshaft and round steel camshaft - Google Patents
Surface treatment method of round steel camshaft and round steel camshaft Download PDFInfo
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- CN103255406A CN103255406A CN2013101844953A CN201310184495A CN103255406A CN 103255406 A CN103255406 A CN 103255406A CN 2013101844953 A CN2013101844953 A CN 2013101844953A CN 201310184495 A CN201310184495 A CN 201310184495A CN 103255406 A CN103255406 A CN 103255406A
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Abstract
The invention discloses a surface treatment method of a round steel camshaft and the round steel camshaft. The surface treatment method of the round steel camshaft comprises the following steps of: heating the round steel camshaft in the alkaline blackening liquid to generate ferrous acid sodium and sodium ferrite on the surface of the round steel camshaft; and generating a magnetic iron oxide film layer on the surface of the round steel camshaft by virtue of action between the ferrous acid sodium, the sodium ferrite and the water. The alkaline blackening liquid comprises the following components in 1L of distilled water or deionized water: 600-650g of sodium hydroxide, 100-150g of sodium nitrate, 20-30g of sodium bicarbonate and 10-20g of sodium oxalate. According to the method disclosed by the invention, by combining the sodium hydroxide, the sodium nitrate, the sodium bicarbonate and the sodium oxalate as the blackening liquid, the solution cost and the environmental pollution are reduced, and meanwhile, the compactness of the surface oxidation film of the round steel camshaft is improved, the corrosion resistance is improved, and the gloss of the surface of a component is good after the component is blackened.
Description
Technical field
The present invention relates to metal surface treatment process, particularly relate to surface treatment method and the round steel camshaft of round steel camshaft.
Background technology
Cam is as the vitals of engine, the time opening of being responsible for each cylinder inlet and outlet door of engine with close.Though the rotating speed of camshaft is half (rotating speed at two-stroke engine convexity wheel shaft is identical with bent axle) of bent axle in Otto cycle engine, but its rotating speed is still very high usually, and need bear very big moment of torsion, therefore very high in the requirement aspect intensity and the support to camshaft in the design.The material of camshaft can adopt round steel.Generally, need adopt cold shock to handle to round steel camshaft working face, the thickness of chill be greatly about about 4mm.Handle the hardness that can improve the nose working-surface by cold shock, increase wear resistance.But the internal stress in the cold shock process is difficult to eliminate thoroughly, causes the wearing and tearing aggravation thereby can cause cam-shaped line to change in the long-term operation process after the stress relief, influences motor performance and life-span.In addition, camshaft almost is positioned at the end of engine lubrication system, the charge oil pressure deficiency appears in reason if lubricating oil pump is because duration of service is long etc., or the oil leab obstruction causes lubricating oil can't arrive camshaft, or the excessive lubricating oil that causes of step cover holding bolt screw-down torque can't enter the camshaft gap, all can cause the inordinate wear of camshaft.And, because camshaft location is disembarked oil pump farthest, set up oil pressure and lag behind, also there is the metal to-metal contact about 0.2 second when starting in the early stage, comparatively serious to the wearing and tearing of camshaft.
The surface blackening technology is that steel surface is handled one of the most frequently used technology, mainly comprises room temperature blackening technology and high-temperature alkaline oxidizing process two classes.The effect that blackout is handled mainly contains following 3 points: 1) rust inhibition is played in the metallic surface; 2) the attractive in appearance and gloss of increase metallic surface; 3) heating of blackout time helps to reduce stress in the workpiece.Though the alkaline oxygenated technology cost of room temperature blackening technology relatively-high temperature is lower, to operate simplyr, the quality that the high-temperature alkaline oxidizing process is handled is significantly better than room temperature blackening technology.Therefore, also be widely adopted up to high-temperature alkaline oxidizing process nowadays.The high-temperature alkaline oxidizing process mainly is that raw materials such as sodium hydroxide, SODIUMNITRATE, Sodium Nitrite and some other additive are mixed in proportion wiring solution-forming, under the temperature about 140 ℃ iron and steel is immersed then and carries out surface treatment in the solution, obtains Fe
3O
4Black coating.But Sodium Nitrite is a kind of carcinogenic highly toxic substance.Therefore, the development of new black-emitting technology that do not have a Sodium Nitrite has become the direction of black-emitting technology development from now on.Chinese invention patent 200710069984.9 discloses a kind of process of blackening carbon steel surface.Its hair blackening liquid comprises ferrous salt, highly basic and hydrazine hydrate, and blackout adopts hydrothermal method to carry out under 100-250 ℃ of temperature in autoclave.But the general employed autoclave volume of hydrothermal method is very little, be not suitable for big component blackout and handle, and hazardous conditions such as blast appear in hydrothermal method easily under high-temperature condition, so this technology can't realize industrial applications.
Summary of the invention
The objective of the invention is to provides a kind of surface treatment method of round steel camshaft at the above-mentioned defective that exists in the prior art.The present invention also provides a kind of process this surface-treated round steel camshaft.
According to one aspect of the present invention, the invention provides a kind of surface treatment method of round steel camshaft, comprising:
Heating round steel camshaft in alkaline hair blackening liquid generates ferrous acid sodium and sodium ferrite on described round steel camshaft surface;
Act on described round steel camshaft surface by described ferrous acid sodium and described sodium ferrite and water and generate the martial ethiops rete;
Consisting of of described alkaline hair blackening liquid, in 1L distilled water or deionized water, contain:
Sodium hydroxide 600-650g;
SODIUMNITRATE 100-150g;
Sodium bicarbonate 20-30g;
Sodium oxalate 10-20g.
Preferably, consisting of of described alkaline hair blackening liquid, contain in 1L distilled water or deionized water:
Sodium hydroxide 630g;
SODIUMNITRATE 120g;
Sodium bicarbonate 25g;
Sodium oxalate 15g.
Preferably, the temperature of described heating can be 130-135 ℃, and the time of described heating can be 10-20min.
Preferably, describedly in alkaline hair blackening liquid, can also comprise before the step of heating round steel camshaft: described round steel camshaft is carried out the cold shock treatment step.
Preferably, the described step that heats the round steel camshaft in alkaline hair blackening liquid can also comprise afterwards: clean and drying step.
According to another aspect of the present invention, the invention provides a kind of round steel camshaft, the camshaft surface have use aforesaid surface treatment method preparation can produce adsorbing martial ethiops rete to machine oil.
Preferably, the thickness of described martial ethiops rete can be 0.6-0.8um.
Preferably, described martial ethiops is Z 250.
The present invention passes through combining hydrogen oxidation sodium, SODIUMNITRATE, sodium bicarbonate and sodium oxalate as hair blackening liquid, in the cost and environmental pollution that reduce solution, improved the compactness of 20Mn round steel camshaft surface film oxide, improved solidity to corrosion, and blackout back piece surface gloss is better.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment technical scheme of the present invention is described in detail.
Alkaline hair blackening liquid of the present invention contains in 1L distilled water or deionized water: the sodium bicarbonate of the sodium hydroxide of 600-650g, the SODIUMNITRATE of 100-150g, 20-30g and the sodium oxalate of 10-20g.
In the prescription of the present invention, the applicant finds that sodium bicarbonate and sodium oxalate can produce a large amount of bubbles in the blackout process, hair blackening liquid is further stirred, and force dirt not to be adsorbed on the surface of part, are conducive to the even formation of oxide film.And the synergy of SODIUMNITRATE, sodium bicarbonate and sodium oxalate makes that blackout layer compact and firm and gloss are better.
Further specify raw material, consumption and the compound method of alkaline hair blackening liquid of the present invention below by specific embodiment.
Embodiment 1
Selection following raw materials according and consumption (unit: g):
Sodium hydroxide 630
SODIUMNITRATE 120
Sodium bicarbonate 25
Sodium oxalate 15
Press above-mentioned raw materials under agitation condition, add successively in the distilled water of 1L, dissolving mixes and gets final product.
The preparation flow of round steel camshaft of the present invention comprises: cam shaft blank → camshaft processing → cold shock is handled → is flowed cold wash → alkaline hair blackening liquid processing → accumulator tank and embathes → hot water cleaning → hot blast drying or drying at room temperature → check.
In above-mentioned alkaline hair blackening liquid treating processes, can choose the prescription of embodiment 1, configure alkaline hair blackening liquid after, alkaline hair blackening liquid is heated to 130-135 ℃.To handle the back and put into above-mentioned alkaline hair blackening liquid with the round steel camshaft of the cold wash of flowing through cold shock, generate ferrous acid sodium and sodium ferrite on round steel camshaft surface, act on round steel camshaft surface generation martial ethiops rete by ferrous acid sodium and sodium ferrite with water.
Blackout 10-20min can take out, and puts into accumulator tank then and embathes.
Check shows, and is better at the martial ethiops rete gloss on round steel camshaft surface.Martial ethiops rete material is mainly Fe
3O
4The thick 0.6-0.8 μ of martial ethiops rete m can not exert an influence to the valve clearance.And because the heat treated in the blackout process has reduced the stress in the round steel camshaft, effectively prolonged the work-ing life of round steel camshaft.The applicant finds that the martial ethiops rete that adopts alkaline hair blackening liquid of the present invention to form has slight adsorption to machine oil, can effectively avoid the metal to-metal contact phenomenon at engine start initial stage.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. the surface treatment method of a round steel camshaft is characterized in that, comprising:
Heating round steel camshaft in alkaline hair blackening liquid generates ferrous acid sodium and sodium ferrite on described round steel camshaft surface;
Act on described round steel camshaft surface by described ferrous acid sodium and described sodium ferrite and water and generate the martial ethiops rete;
Consisting of of described alkaline hair blackening liquid, in 1L distilled water or deionized water, contain:
Sodium hydroxide 600-650g;
SODIUMNITRATE 100-150g;
Sodium bicarbonate 20-30g;
Sodium oxalate 10-20g.
2. surface treatment method according to claim 1 is characterized in that, consisting of of described alkaline hair blackening liquid contains in 1L distilled water or deionized water:
Sodium hydroxide 630g;
SODIUMNITRATE 120g;
Sodium bicarbonate 25g;
Sodium oxalate 15g.
3. surface treatment method according to claim 1 is characterized in that, the temperature of described heating is 130-135 ℃, and the time of described heating is 10-20min.
4. surface treatment method according to claim 1 is characterized in that, describedly also comprises before the step of heating round steel camshaft in alkaline hair blackening liquid: described round steel camshaft is carried out the cold shock treatment step.
5. surface treatment method according to claim 1 is characterized in that, the described step that heats the round steel camshaft in alkaline hair blackening liquid also comprises afterwards: clean and drying step.
6. a round steel camshaft is characterized in that,
What the camshaft surface had that right to use requires the preparation of 1 described surface treatment method can produce adsorbing martial ethiops rete to machine oil.
7. round steel camshaft according to claim 6 is characterized in that, the thickness of described martial ethiops rete is 0.6-0.8 μ m.
8. round steel camshaft according to claim 6 is characterized in that, described martial ethiops is Z 250.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310184495.3A CN103255406B (en) | 2013-05-16 | 2013-05-16 | The surface treatment method of round steel camshaft and round steel camshaft |
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| CN201310184495.3A CN103255406B (en) | 2013-05-16 | 2013-05-16 | The surface treatment method of round steel camshaft and round steel camshaft |
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| CN103255406A true CN103255406A (en) | 2013-08-21 |
| CN103255406B CN103255406B (en) | 2016-03-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104233275A (en) * | 2014-09-23 | 2014-12-24 | 中山市华光化工有限公司 | High-temperature blackening agent suitable for stainless steel or alloy steel and using method of high-temperature blackening agent |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB464656A (en) * | 1936-01-11 | 1937-04-22 | Eugene Rivoche | Improvements in and relating to the process of blackening iron and steel, and protecting the same from rust |
| JPS62103373A (en) * | 1985-10-28 | 1987-05-13 | Nippon Fuerumaito Soushiya:Kk | Rust preventive treatment for iron and steel products |
| CN1418981A (en) * | 2001-11-13 | 2003-05-21 | 李传斌 | Water-based metal rust inhibitor |
| CN101082129A (en) * | 2007-07-11 | 2007-12-05 | 浙江理工大学 | Method for carbon steel surface blackening |
-
2013
- 2013-05-16 CN CN201310184495.3A patent/CN103255406B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB464656A (en) * | 1936-01-11 | 1937-04-22 | Eugene Rivoche | Improvements in and relating to the process of blackening iron and steel, and protecting the same from rust |
| JPS62103373A (en) * | 1985-10-28 | 1987-05-13 | Nippon Fuerumaito Soushiya:Kk | Rust preventive treatment for iron and steel products |
| CN1418981A (en) * | 2001-11-13 | 2003-05-21 | 李传斌 | Water-based metal rust inhibitor |
| CN101082129A (en) * | 2007-07-11 | 2007-12-05 | 浙江理工大学 | Method for carbon steel surface blackening |
Non-Patent Citations (2)
| Title |
|---|
| 技工学校机械类通用教材编审委员会: "《热处理工艺学》", 31 August 1980, 机械工业出版社 * |
| 河北省邮电管理局: "《轻骑摩托车的使用与维修》", 31 March 1975 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104233275A (en) * | 2014-09-23 | 2014-12-24 | 中山市华光化工有限公司 | High-temperature blackening agent suitable for stainless steel or alloy steel and using method of high-temperature blackening agent |
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| CN103255406B (en) | 2016-03-02 |
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