CN1570192A - Valve finisher surface modified processing method - Google Patents
Valve finisher surface modified processing method Download PDFInfo
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- CN1570192A CN1570192A CN 200410017949 CN200410017949A CN1570192A CN 1570192 A CN1570192 A CN 1570192A CN 200410017949 CN200410017949 CN 200410017949 CN 200410017949 A CN200410017949 A CN 200410017949A CN 1570192 A CN1570192 A CN 1570192A
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Abstract
The invention relates to a surface modification processing method for the engine critical component, which belongs to the field of the steel surface chemistry thermal treatment processing technology. The processing method comprises: nitriding for the air valve finisher by using the plasma technology, adding carbon-containing gas in the nitrogen-containing gas at the late stage of nitriding and carrying out the nitrocarburizing, and placing the mould in the steam oxidizing furnace for surface oxidizing treatment. The mould treated by said technology has excellent mechanical property, improved surface hardness, improved compression resistance, improved wear resistance and improved thermal fatigue resistance.
Description
Technical field
The present invention relates to a kind of surface modification treatment working method of precision forging die of engine key part valve, belong to steel surface thermo-chemical treatment processing technique field.
Background technology
Valve is the vital part of various engines, is widely used in industries such as automobile, aircraft, agricultural machinery and boats and ships.Valve work the time is subjected to the frictional wear with valve seating of washing away of high-temperature gas, be easy to lose efficacy and scrap, be the performance that improves valve, its selection also progressively from converted steel progressively to transformations such as heat-resistance stainless steel, superalloys.The novel material that valve adopts has higher hot strength than traditional material usually, and its thermal deformation drag improves thereupon.
The valve precision forging die generally adopts the hot-work die steel manufacturing, has good intensity and flexible after the thermal treatment and cooperates.In general, it is the main failure forms of valve precision forging die that thermal fatigue, wearing and tearing and pressure are collapsed, and these several inefficacies all are that the increase along with the mould access times progressively accumulates and increases the weight of.People often improve intensity, the hardness of mould emphatically, resistance to wear to help mould, the improvement of heat resistanceheat resistant deformation nature, but do the common plasticity of damaging mould, toughness like this, thereby reduce the performance of mould opposing thermal fatigue.When selecting for use materials such as heat-resistance stainless steel, superalloy to make when valve, its thermal distortion drag increases, but that the pressure of mould is collapsed and wearing and tearing become is comparatively remarkable.If by adjusting thermal treatment process, regulate the plasticity and toughness of hot-work die steel and obtain the ability that high strength is collapsed and worn and torn with the resistance to compression of raising mould, but can not fundamentally solve the problem that obviously descend die life.
In addition, better rapid steel of heat resistance and even powder metallurgy are used to make the valve precision forging die, because rapid steel, powder alloy material at high temperature still can keep very high hardness, the pressure of mould is collapsed and wearing and tearing are under control, but the ability of the cold-resistant hot alternately impinge of these materials is poor, and the generation of die surface thermal fatigue and the speed of development are very fast.And, use rapid steel, especially powder metallurgy mould, die cost will increase substantially.
Summary of the invention
The object of the present invention is to provide a kind of surface heat processing method of valve precision forging die, to improve intensity, the hardness of hot-work die steel, the resistance to compression that improves mould flogs 5 and the health polishing machine, and die matrix heart portion still keeps good plasticity and toughness, thereby improves gas work-ing life.
The surface modification treatment working method of a kind of valve precision forging die of the present invention mainly adopts nitridation process, the method is characterized in that to have following technological process and step:
A. the valve precision forging die that adopts former hot-work die steel to make after the tempering of quenching, is put into special-purpose plasma heat treatment equipment, feeds the nitrogen containing atmosphere based on ammonia, and the plasma nitriding that carried out in 500-550 ℃ of temperature range 2-8 hour is handled;
When b. plasma nitriding finishes, feed ammonia and acetone gas mixture again, the plasma carbonitriding that carried out under above-mentioned 500-550 ℃ temperature 1-3 hour is handled, and the volume ratio of ammonia and acetone gas is 10: 1～5: 1;
C. and then put into the steam oxidation stove, under the vapor pressure of 0.05～0.25MPa, in 500-550 ℃ of temperature range, mould is carried out surface oxidation treatment.
D. after above-mentioned recombining process is handled, make die surface be uniform pewter, and the mould surface structure forms three layers, promptly top layer is an oxide film, and thickness is 3～10 μ m; The second level top layer is nitrogen, carbon diffusion layer, and thickness is 100～400 μ m, and the 3rd layer is matrix heart portion, below inferior top layer, is the matrix of hot-work die steel.
Have following advantage and characteristics in surface treatment and finishing process method of the present invention:
1) it is different that processing method of the present invention and traditional gas nitriding or salt bath nitriding carry out nitriding institute usually in 560-570 ℃ of temperature range, the plasma nitriding infiltration rate that the present invention adopts is very fast, therefore can adopt lower nitriding temperature, can make the die steel matrix keep higher hardness like this, the high rigidity of matrix also helps nitrided case and obtains higher hardness.
2) under plasma condition, carry out nitrogen, carbon and ooze processing altogether, when the surface continues to infiltrate nitrogen, infiltrate carbon atom and further improve surface hardness.And make diffusion layer that the good hardness gradient distribution and the distribution of stress gradient from outward appearance to inner essence be arranged.
3) acquisition of the high rigidity resistance to compression that improved the valve precision forging die collapse, wear resistance; The stress distribution that die surface is good is very useful to the improvement of mold hot fatigue property, also helps reducing the wearing and tearing of mould.
4) in steam oven, die surface is carried out oxide treatment surface compound outside diffusion layer can eliminate preceding road plasma treatment the time after the plasma treatment.The compound of this white normally is made up of mixing such as nitride, small amounts things, has very high hardness, but because thinner thickness, the collapse raising of performance of the resistance to compression of mould is not played effect, under thermal shock, be easy to generate crackle, the thermal fatigue resistance of mould there is bigger damage.Oxide treatment will make the nitride of white change, and form the bluish grey oxide film based on Z 250.So oxide treatment helps the improvement of mold hot fatigue property.And oxide film does not have obvious influence to thermal fatigue resistance, the resistance to compression performance of collapsing, but the lubricating condition can improve the valve moulding time and reduce friction wear prolongs die life, and improves the Workpiece shaping quality.
Embodiment
After now specific embodiments of the invention being described in.
Embodiment one: the specific embodiment and the processing step of the embodiment of the invention are as follows:
1) the valve fine blanking die that adopts hot-work die steel to make is put into special-purpose plasma heat treatment equipment after the tempering of quenching, feed the nitrogen containing atmosphere based on ammonia earlier, and the plasma nitriding that carried out under 530 ℃ of temperature 5 hours is handled.
When 2) plasma nitriding finishes, feed ammonia and acetone gas mixture, the volume ratio of ammonia and acetone gas is 7.5: 1, and the grade of carrying out 2 hours under 530 ℃ of above-mentioned same temperature is handled from carbonitriding.
3) then mould is put into the steam oxidation stove, under the vapor pressure of 0.15MPa, under 530 ℃ of temperature mould is carried out surface oxidation treatment.
4) after above-mentioned recombining process is handled, make die surface be uniform pewter, and the mould surface structure is three layers, promptly the top layer of the first layer is an oxide film, and thickness is 3～10 μ m; The second level top layer is nitrogen, carbon diffusion layer, and thickness is 100～400 μ m, and the 3rd layer of matrix heart portion below inferior top layer, is the matrix of hot-work die steel precision forging die.
In the present embodiment, its precision forging die carried out surface modification treatment processing after, through Mechanics Performance Testing, the surface hardness of this mould can reach 60～65HRC, its matrix centre hardness can reach 52～56HRC.This shows to have the better hardness performance.
Claims (1)
1. the surface modification treatment working method of a valve precision forging die mainly adopts nitridation process, the method is characterized in that to have following technological process and step:
A. the valve precision forging die that adopts former hot-work die steel to make after the tempering of quenching, is put into special-purpose plasma heat treatment equipment, feeds the nitrogen containing atmosphere based on ammonia, and the plasma nitriding that carried out in 500-550 ℃ of temperature range 2-8 hour is handled;
When b. plasma nitriding finishes, feed ammonia and acetone gas mixture again, the plasma carbonitriding that carried out under above-mentioned 500-550 ℃ temperature 1-3 hour is handled, and the volume ratio of ammonia and acetone gas is 10: 1～5: 1;
C. and then put into the steam oxidation stove, under the vapor pressure of 0.05～0.25MPa, in 500-550 ℃ of temperature range, mould is carried out surface oxidation treatment.
D. after above-mentioned recombining process is handled, make die surface be uniform pewter, and the mould surface structure forms three layers, promptly top layer is an oxide film, and thickness is 3～10 μ m; The second level top layer is nitrogen, carbon diffusion layer, and thickness is 100～400 μ m, and the 3rd layer is matrix heart portion, below inferior top layer, is the matrix of hot-work die steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410017949 CN1570192A (en) | 2004-04-27 | 2004-04-27 | Valve finisher surface modified processing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410017949 CN1570192A (en) | 2004-04-27 | 2004-04-27 | Valve finisher surface modified processing method |
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| CN1570192A true CN1570192A (en) | 2005-01-26 |
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| CN 200410017949 Pending CN1570192A (en) | 2004-04-27 | 2004-04-27 | Valve finisher surface modified processing method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101096986B (en) * | 2006-06-29 | 2011-08-03 | 通用汽车环球科技运作公司 | Salt bath ferritic nitrocarburizing of brake rotors |
| CN102230150A (en) * | 2011-06-23 | 2011-11-02 | 河南中原吉凯恩气缸套有限公司 | Surface treatment process of cast iron cylinder jacket |
| CN103898438A (en) * | 2014-04-24 | 2014-07-02 | 鑫光热处理工业(昆山)有限公司 | Gas nitrocarburizing and vapor composite treatment technique |
| CN104550837A (en) * | 2014-12-16 | 2015-04-29 | 哈尔滨工业大学 | CIM (Computer Integrated Manufacturing)-process-based hot-work die steel material surface modification method |
| CN105483605A (en) * | 2015-12-09 | 2016-04-13 | 常州大学 | Ion nitrocarburizing and ion nitriding composite surface modification treatment method |
| CN106244981A (en) * | 2016-08-29 | 2016-12-21 | 华南理工大学 | A kind of valve hot-forging die enhanced processing method |
| CN106480398A (en) * | 2016-09-01 | 2017-03-08 | 宁波群力紧固件制造有限公司 | A kind of multiple thread based on carbo-nitriding technology and preparation method thereof |
| CN107447186A (en) * | 2017-07-31 | 2017-12-08 | 安徽沃德气门制造有限公司 | A kind of valve surfaces processing method |
| CN108866474A (en) * | 2018-06-22 | 2018-11-23 | 珠海格力精密模具有限公司 | Mold processing method |
| CN109652758A (en) * | 2019-02-28 | 2019-04-19 | 浙江华业塑料机械有限公司 | A kind of environmental protection processing method of screw rod wearing layer |
-
2004
- 2004-04-27 CN CN 200410017949 patent/CN1570192A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101096986B (en) * | 2006-06-29 | 2011-08-03 | 通用汽车环球科技运作公司 | Salt bath ferritic nitrocarburizing of brake rotors |
| CN102230150A (en) * | 2011-06-23 | 2011-11-02 | 河南中原吉凯恩气缸套有限公司 | Surface treatment process of cast iron cylinder jacket |
| CN102230150B (en) * | 2011-06-23 | 2013-05-01 | 河南中原吉凯恩气缸套有限公司 | Surface treatment process of cast iron cylinder jacket |
| CN103898438A (en) * | 2014-04-24 | 2014-07-02 | 鑫光热处理工业(昆山)有限公司 | Gas nitrocarburizing and vapor composite treatment technique |
| CN103898438B (en) * | 2014-04-24 | 2016-03-09 | 鑫光热处理工业(昆山)有限公司 | Gas nitrocarburizing and water vapour composite treatment process |
| CN104550837B (en) * | 2014-12-16 | 2016-08-24 | 哈尔滨工业大学 | A kind of method of hot-work die steel material surface modification based on CIM technique |
| CN104550837A (en) * | 2014-12-16 | 2015-04-29 | 哈尔滨工业大学 | CIM (Computer Integrated Manufacturing)-process-based hot-work die steel material surface modification method |
| CN105483605A (en) * | 2015-12-09 | 2016-04-13 | 常州大学 | Ion nitrocarburizing and ion nitriding composite surface modification treatment method |
| CN106244981A (en) * | 2016-08-29 | 2016-12-21 | 华南理工大学 | A kind of valve hot-forging die enhanced processing method |
| CN106244981B (en) * | 2016-08-29 | 2018-09-14 | 华南理工大学 | A kind of valve hot-forging die enhanced processing method |
| CN106480398A (en) * | 2016-09-01 | 2017-03-08 | 宁波群力紧固件制造有限公司 | A kind of multiple thread based on carbo-nitriding technology and preparation method thereof |
| CN106480398B (en) * | 2016-09-01 | 2018-10-30 | 宁波群力紧固件制造有限公司 | A kind of multiple thread and preparation method thereof based on carbo-nitriding technology |
| CN107447186A (en) * | 2017-07-31 | 2017-12-08 | 安徽沃德气门制造有限公司 | A kind of valve surfaces processing method |
| CN108866474A (en) * | 2018-06-22 | 2018-11-23 | 珠海格力精密模具有限公司 | Mold processing method |
| CN109652758A (en) * | 2019-02-28 | 2019-04-19 | 浙江华业塑料机械有限公司 | A kind of environmental protection processing method of screw rod wearing layer |
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