CN106435467B - A kind of pivoting support surface endurance treatment process - Google Patents
A kind of pivoting support surface endurance treatment process Download PDFInfo
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- CN106435467B CN106435467B CN201610824755.2A CN201610824755A CN106435467B CN 106435467 B CN106435467 B CN 106435467B CN 201610824755 A CN201610824755 A CN 201610824755A CN 106435467 B CN106435467 B CN 106435467B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C12/00—Solid state diffusion of at least one non-metal element other than silicon and at least one metal element or silicon into metallic material surfaces
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Abstract
A kind of pivoting support surface endurance treatment process of disclosure of the invention, comprising the following steps: 1) clean；2) primary preheating；3) salt-bath nitriding；4) it cleans；5) Carburization Treatment 6) secondary preheating；7) it polishes；8) liquid oxidizing 9) secondary Carburization Treatment 10) secondary liquid oxidizing；11) it rinses.It carries out intersecting carburizing and liquid oxidizing processing again by first carrying out salt-bath nitriding in treatment process of the present invention, the microhardness highest of pivoting support clad surface, coating thickness is uniform, it is evenly distributed, it is fine and close, completely, the binding ability of coating and basis material is stronger, Salt corrosion corrosion and anticorrosion stress-resistant disruptiveness can further be improved, by using the processed pivoting support of the present invention, pivoting support dimensionally stable, high temperature deformation is small, surface hardness reaches HV2500 or more, dry friction coefficient is reduced to 0.08~0.1, wearability improves 450%, its fatigue life is 10-12 times of normative heat treatment, comprehensive performance meets extremely rugged environment requirement.
Description
Technical field
The present invention relates to pivoting support field of surface treatment, handle work more particularly to a kind of pivoting support surface endurance
Skill.
Background technique
Pivoting support industry has gone through the development in more than 30 years in China, the JB2300-84 issued for the first time from 1984
" pivoting support form, basic parameter and technical requirements " standard, and the JB/T2300-1999 " revolution in revision in 1999
Bearing " standard, existing China has been that had perfect pivoting support design, the comprehensive exploitation ability of manufacture and test.Simultaneously not
Same industry proposes the standard of oneself, such as wind-power electricity generation, building machinery, bearing industry to pivoting support page,
Pivoting support in the present invention is for the big machinery in desert, and use environment is more severe, and existing pivoting support
Its use demand is not achieved in process of surface treatment.
Summary of the invention
The object of the present invention is to provide a kind of pivoting support surface endurance treatment process, real by the following technical programs
It is existing:
A kind of pivoting support surface endurance treatment process, comprising the following steps:
1) it cleans
Under the action of aqueous cleaning agent, using ultrasonic cleaning 8-10s；The aqueous cleaning agent by mass percentage by
Following component is made: metasilicate pentahydrate sodium 11.3%, methenamine 1.5%, ethyl alcohol 25%, glyceryl monostearate 2.2%, 2- hydroxyl
Ethamine 1.4%, peppermint oil 0.3%, remaining is deionized water；
2) primary preheating
It is and temperature to be adjusted to -15 DEG C to -18 DEG C, mistake under 0 .07-0.08MPa that pivoting support is first placed in vacuum degree
After 25min, it is isothermal holding 1-2h at 275-280 DEG C that pivoting support, which is put into temperature,；
3) salt-bath nitriding
Pivoting support after preheating is placed in 415 ± 5 DEG C of salt bath, handles 115-130min；
Salt-bath nitriding use nitridation salt by mass percentage, formula composition are as follows: urea 50-55%, NaCN
1.5-2%、YCl3·6H2O 0.01-0.012%,KCNO 10-20%,NaCNO 18-22%,NaCl 10-12%；
4) it cleans
It is cooled to 60-80 DEG C under air, 15min is cleaned using 50-55 DEG C of hot water；
5) Carburization Treatment
Pivoting support is placed in the carburizing medium that temperature is 920~930 DEG C, carbon potential is 1.1%~1.15% and keeps the temperature 1-
After 1.5 hours, cooled to room temperature；The carburizing medium is made of following component by weight: isopropanol 50, n-butanol
10, borax 1, kerosene 1；
6) secondary preheating
By pivoting support be placed in temperature be 325-350 DEG C in, and to its surface spray saturated solution of sodium carbonate, spray 20s,
Keep constant temperature 40min；
7) it polishes；
It cools down, mechanically polishes under air；
8) liquid oxidizing
Pivoting support is placed in 550 ± 8 DEG C of salt bath, handles 155min；The saline oxide that liquid oxidizing uses presses quality
Percentages, formula composition are as follows: KNO3 15-27%、NaNO3 20-22%、NaCl 22-24%、NaNO2 25-30%, borax 2-3%；
9) secondary Carburization Treatment
Pivoting support is placed in the carburizing medium that temperature is 900~915 DEG C, carbon potential is 1.2%~1.25% and is kept the temperature
After 35min, cooled to room temperature；The carburizing medium is made of following component by weight: isopropanol 42, vinegar 1, positive fourth
Alcohol 10, kerosene 2；The vinegar is light-coloured vinegar；
10) secondary liquid oxidizing
Pivoting support is placed in 530 ± 8 DEG C of salt bath, handles 120min；The saline oxide that liquid oxidizing uses presses quality
Percentages, formula composition are as follows: KNO3 20-25%、NaNO3 25-30%、NaCl 18-25%、NaNO2 15-28%、YCl 3·
6H2O 0.01-0.015%；
11) it rinses
Pivoting support after oxidation is rinsed with hot water, mass concentration is then first used to clean for the ethanol solution of 30-40%
10min, then 10min is cleaned with clear water, surface is dried, immersion oil.
Further, in the step 3) salt-bath nitriding use nitridation salt by mass percentage, formula composition
Are as follows: urea 51.243%, NaCN 1.5%, YCl3·6H2O 0.012%、KCNO 18.322%、NaCNO 18.923%、NaCl
10%。
Further, the saline oxide that the liquid oxidizing of step 8) uses by mass percentage, formula composition are as follows:
KNO3 25%、NaNO3 21%、NaCl 24%、NaNO2 28%, borax 2%.
Further, the saline oxide that the secondary liquid oxidizing of the step 10) uses by mass percentage, formula composition
Are as follows: KNO3 24.223%、NaNO3 27.442%、NaCl 25%、NaNO2 23.323%、YCl 3·6H2O 0.012%。
The present invention passes through a large amount of experimental study, is largely optimized to the process of surface treatment of pivoting support, strengthens
Infiltration layer improves the surface of pivoting support to carry out great improvement to pivoting support surface infiltration layer ingredient, tissue, performance
Wearability and salt tolerance improve the service life of pivoting support.By the diffusion activation energy of boron atom, thus to rare earth member
Element, nitrogen, carbon form more excellent infiltration layer on pivoting support surface, to improve the salt tolerance on pivoting support surface,
High temperature oxidation resistance first carries out salt-bath nitriding through the invention and carries out intersecting carburizing and liquid oxidizing processing again, and pivoting support covers
The microhardness highest of layer surface, coating thickness is uniform, is evenly distributed, fine and close, complete, the binding ability of coating and basis material
It is relatively strong, it can further improve Salt corrosion corrosion and anticorrosion stress-resistant disruptiveness.
Treatment process of the present invention is used behind cleaning and a Carburization Treatment step at primary preheating and secondary preheating
Reason, cooperates the effect of other treatment process, introduces on pivoting support surface and produces very high compression, to greatly mention
Its high fatigue resistance, test proves that can be improved 10-12 times of fatigue resistance compared to conventional treatment, pivoting support breaks
It splits and is greatly reduced the phenomenon that tearing, and pivoting support internal structure and surface texture occur conversion and combine, and return
Flexural strength, tensile property and the toughness for turning bearing are all greatly improved.
35.5%, while the hardness and wearability of infiltration layer can be improved in the Carburization Treatment process that the present invention uses, carburizing speed
It is all significantly improved, in carburizing process, the carburizing medium that the present invention prepares all plays rush to the diffusion of absorption and carbon atom
Into effect.
The beneficial effects of the present invention are: in treatment process of the present invention by first carry out salt-bath nitriding carry out again intersect carburizing and
Liquid oxidizing processing, the microhardness highest of pivoting support clad surface, coating thickness is uniform, is evenly distributed, fine and close, complete,
The binding ability of coating and basis material is stronger, can further improve Salt corrosion corrosion and anticorrosion stress-resistant disruptiveness, leads to
Cross using the processed pivoting support of the present invention, pivoting support dimensionally stable, high temperature deformation is small, surface hardness up to HV2500 with
On, dry friction coefficient is reduced to 0.08~0.1, and wearability improves 450%, and fatigue life is the 10-12 of normative heat treatment
Times, comprehensive performance meets extremely rugged environment requirement.
Specific embodiment
1: salt-bath nitriding of embodiment use nitridation salt by mass percentage, formula composition are as follows: urea
51.243%、NaCN 1.5%、YCl3·6H2O 0.012%,KCNO 18.322%,NaCNO 18.923%,NaCl 10%；
Liquid oxidizing use saline oxide by mass percentage, formula composition are as follows: KNO3 25%、NaNO3 21%、
NaCl 24%、NaNO2 28%, borax 2%；
The saline oxide that secondary liquid oxidizing uses by mass percentage, formula composition are as follows: KNO3 24.223%、NaNO3
27.442%、NaCl 25%、NaNO2 23.323%、YCl 3·6H2O 0.012%。
2: salt-bath nitridings of embodiment use nitridation salt by mass percentage, formula composition are as follows: urea
52.243%、NaCN 1.5%、YCl3·6H2O 0.012%,KCNO 14.322%,NaCNO 20.923%,NaCl 11%；
Liquid oxidizing use saline oxide by mass percentage, formula composition are as follows: KNO3 26%、NaNO3 20%、
NaCl 22%、NaNO2 29%, borax 3%；
The saline oxide that secondary liquid oxidizing uses by mass percentage, formula composition are as follows: KNO3 22.223%、NaNO3
29.442%、NaCl 24%、NaNO2 24.321%、YCl 3·6H2O 0.014%。
3: salt-bath nitridings of embodiment use nitridation salt by mass percentage, formula composition are as follows: urea
50.243%、NaCN 1.5%、YCl3·6H2O 0.012%,KCNO 16.322%,NaCNO 19.923%,NaCl 12%；
Liquid oxidizing use saline oxide by mass percentage, formula composition are as follows: KNO3 24%、NaNO3 22%、
NaCl 23%、NaNO2 29%, borax 2%；
The saline oxide that secondary liquid oxidizing uses by mass percentage, formula composition are as follows: KNO3 23.223%、NaNO3
28.442%、NaCl 22%、NaNO2 25.322%、YCl 3·6H2O 0.013%。
Above embodiments are all identical using method and step, carried out by following steps in the present invention: 1) being cleaned；2) primary
Preheating；3) salt-bath nitriding；4) it cleans；5) Carburization Treatment 6) secondary preheating；7) it polishes；8) liquid oxidizing 9) two
Secondary Carburization Treatment 10) secondary liquid oxidizing；11) it rinses.
Thermal fatigue test is carried out from constraint thermal fatigue tester using resistance stove heating.Heat fatigue sample is loaded on a cube card
Four sides of tool guarantee the heating and cooling position consistency of every piece of sample.It is moved vertically up and down by transmission device, to reach
To automatically completing for sample heating and cooling.Using automatic control when setting, thermocouple measurement simultaneously controls temperature.Sample is in room temperature 25
DEG C to heat between 800 DEG C and cooling thermal cycle.It is counted automatically using counter.It adjusts and keeps furnace temperature 800
DEG C, 20 DEG C of water temperature (flowing running water).Quick heating sample.It is heating, cooling once as a circulation, when each circulating-heating
Between be 120s, entering water cooling time is 5s, until predetermined cycle-index.For the sample of research heat fatigue cracking germinating, often follow
Ring 400 times, sample is removed, polishing removal surface film oxide measures face crack length, using 0.1mm as crack initiation length,
Write down sample crack initiation cycle-index.It observes and takes a picture to the germinating position of crackle.For research crack propagation of thermal fatigue
Sample, every circulation 200 times, removes sample, polishes and observe.After determining that crackle has germinated, 200 observation crackles of every circulation are simultaneously
It takes a picture to the position that can reflect crack propagation path feature.
Table 1
As can be seen from Table 1, when proceeding to 13000 times, processed conventionally pivoting support heat fatigue cracking is in length
Degree, width and depth etc. start to extend, but the pivoting support not yet crack initiation that the present invention is handled；Proceed to 24000 times
When, processed conventionally pivoting support crackle becomes coarseer, and occurs in the gap of processed conventionally pivoting support crackle bright
Aobvious oxidation sign；But when the pivoting support of the processing of the embodiment of the present invention 1 proceeds to 24000 times, crackle is only 0.12mm, and
The pivoting support crack propagation that the present invention is handled is more balanced, and lead crack is slower with respect to other tissue developments, therefore, by this hair
The pivoting support fatigue performance of daylight reason is more superior.
Claims (1)
1. a kind of pivoting support surface endurance treatment process, which comprises the following steps:
1) it cleans
Under the action of aqueous cleaning agent, using ultrasonic cleaning 8-10s；The aqueous cleaning agent is by mass percentage by following
Ingredient is made: metasilicate pentahydrate sodium 11.3%, methenamine 1.5%, ethyl alcohol 25%, glyceryl monostearate 2.2%, 2 hydroxy ethylamine
1.4%, peppermint oil 0.3%, remaining is deionized water；
2) primary preheating
It is and temperature to be adjusted to -15 DEG C to -18 DEG C, mistake under 0 .07-0.08MPa that pivoting support is first placed in vacuum degree
After 25min, it is isothermal holding 1-2h at 275-280 DEG C that pivoting support, which is put into temperature,；
3) salt-bath nitriding
Pivoting support after preheating is placed in 415 ± 5 DEG C of salt bath, handles 115-130min；
Salt-bath nitriding use nitridation salt by mass percentage, formula composition are as follows: urea 50-55%, NaCN 1.5-2%,
YCl3·6H2O 0.01-0.012%,KCNO 10-20%,NaCNO 18-22%,NaCl 10-12%；
4) it cleans
It is cooled to 60-80 DEG C under air, 15min is cleaned using 50-55 DEG C of hot water；
5) Carburization Treatment
It is small that pivoting support is placed in heat preservation 1-1.5 in the carburizing medium that temperature is 920~930 DEG C, carbon potential is 1.1%~1.15%
Shi Hou, cooled to room temperature；The carburizing medium is made of following component by weight: isopropanol 50, n-butanol 10, boron
Sand 1, kerosene 1；
6) secondary preheating
By pivoting support be placed in temperature be 325-350 DEG C in, and to its surface spray saturated solution of sodium carbonate, spray 20s, keep
Constant temperature 40min；
7) it polishes；
It cools down, mechanically polishes under air；
8) liquid oxidizing
Pivoting support is placed in 550 ± 8 DEG C of salt bath, handles 155min；The saline oxide that liquid oxidizing uses presses quality percentage
Than meter, formula composition are as follows: KNO3 15-27%、NaNO3 20-22%、NaCl 22-24%、NaNO2 25-30%, borax 2-3%；
9) secondary Carburization Treatment
Pivoting support is placed in the carburizing medium that temperature is 900~915 DEG C, carbon potential is 1.2%~1.25% and keeps the temperature 35min
Afterwards, cooled to room temperature；The carburizing medium is made of following component by weight: isopropanol 42, vinegar 1, n-butanol 10,
Kerosene 2；The vinegar is light-coloured vinegar；
10) secondary liquid oxidizing
Pivoting support is placed in 530 ± 8 DEG C of salt bath, handles 120min；The saline oxide that liquid oxidizing uses presses quality percentage
Than meter, formula composition are as follows: KNO3 20-25%、NaNO3 25-30%、NaCl 18-25%、NaNO2 15-28%、YCl3·6H2O
0.01-0.015%；
11) it rinses
Pivoting support after oxidation is rinsed with hot water, mass concentration is then first used to clean for the ethanol solution of 30-40%
10min, then 10min is cleaned with clear water, surface is dried, immersion oil；The nitridation salt that a salt-bath nitriding uses in the step 3) is pressed
Mass percent meter, formula composition are as follows: urea 51.243%, NaCN 1.5%, YCl3·6H2O 0.012%、KCNO 18.322%、
NaCNO 18.923%,NaCl 10%；The saline oxide that liquid oxidizing of step 8) uses by mass percentage, is formulated
Composition are as follows: KNO3 25%、NaNO3 21%、NaCl 24%、NaNO2 28%, borax 2%；The secondary liquid oxidizing of step 10) uses
Saline oxide by mass percentage, formula composition are as follows: KNO3 24.223%、NaNO3 27.442%、NaCl 25%、NaNO2
23.323%、YCl3·6H2O 0.012%。
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276346A (en) * | 2013-05-06 | 2013-09-04 | 青岛泰德汽车轴承有限责任公司 | Processing method of metal bearing retainer |
| CN103697186A (en) * | 2013-12-16 | 2014-04-02 | 四川精控阀门制造有限公司 | Plug of pressure-balance oil seal plug valve and plug surface processing technology |
| CN104294209A (en) * | 2014-10-28 | 2015-01-21 | 河南省广天铸件有限公司 | Salt bath nitrogen treatment technology for casting iron pan |
| CN105779931A (en) * | 2015-12-23 | 2016-07-20 | 德阳瑞泰科技有限公司 | QPQ treatment process suitable for pure water hydraulic component |
-
2016
- 2016-09-14 CN CN201610824755.2A patent/CN106435467B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276346A (en) * | 2013-05-06 | 2013-09-04 | 青岛泰德汽车轴承有限责任公司 | Processing method of metal bearing retainer |
| CN103697186A (en) * | 2013-12-16 | 2014-04-02 | 四川精控阀门制造有限公司 | Plug of pressure-balance oil seal plug valve and plug surface processing technology |
| CN104294209A (en) * | 2014-10-28 | 2015-01-21 | 河南省广天铸件有限公司 | Salt bath nitrogen treatment technology for casting iron pan |
| CN105779931A (en) * | 2015-12-23 | 2016-07-20 | 德阳瑞泰科技有限公司 | QPQ treatment process suitable for pure water hydraulic component |
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