CN1067684A - Hot treating method for elastic parts - Google Patents
Hot treating method for elastic parts Download PDFInfo
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- CN1067684A CN1067684A CN 91106725 CN91106725A CN1067684A CN 1067684 A CN1067684 A CN 1067684A CN 91106725 CN91106725 CN 91106725 CN 91106725 A CN91106725 A CN 91106725A CN 1067684 A CN1067684 A CN 1067684A
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Abstract
The invention belongs to the heat treatment technics field, relate to a kind of hot treating method for elastic parts.This heat treating method comprises elastic part is quenched under 850 ℃ ± 10 ℃ temperature, 400-500 ℃ of temperature tempering, blasts, the surface is cleaned with clean-out system, put into nitriding furnace afterwards and carry out the thermal treatment of vacuum pulse tufftride, 400-500 ℃ of vacuum pulse tufftride thermal treatment temps, heat treatment time 4-6 hours, nitride dielectric layer are ammonia (NH
3), feed N afterwards
2Shielding gas, be cooled to 300 ℃, the oil cooling of coming out of the stove, be tempered to 200 ℃ again after air cooling.With the elastic part after the inventive method thermal treatment, have best hardness value, improve 3-4 times work-ing life.
Description
The invention belongs to the heat treatment technics field, relate to a kind of hot treating method for elastic parts.
Spring is a kind of mechanical component of working under the repeated stress condition, and general requirement has high safe range of stress, favorable surface quality and elasticity dispensing efficient, enough characteristics such as resilience toughness.In order to reach these requirements elastic part is taked suitable thermal treatment, to obtain high fatigue strength and elastic limit.In " thermal treatment ABC " book, introduced the general heat treating method of making spring with spring steel, comprise quenching, 400-520 ℃ temperature tempering under 870 ℃ ± 10 ℃ temperature, shot peening after the tempering (blast) is carried out phosphatization to the surface after the thermal treatment or blackout is handled.The elastic part fatigue strength that this heat treating method obtains is still lower, and work-ing life is short, can not satisfy the military service limit of the higher elastic part of general requirement and both waste national important high-test metal material, has increased all troubles of use producer again.For the intensity that improves metallic substance, usually adopt chemical heat treatment method to strengthen to metal material surface, as the upper layer with nitrogen infiltration steel is nitrogenize thermal treatment, the medium that nitrogenize thermal treatment is used is an ammonia, because ammonia when decompositing activity (N), also decomposites a large amount of H
2If, H
2Also penetrate into the metallic surface, will produce hydrogen embrittlement, can reduce the fatigue resistance of material on the contrary, if will remove hydrogen embrittlement, the reheat that then also will carry out more than 8 hours is handled, expend a large amount of energy and prolong the device fabrication cycle, elastic part had not both met the production technique of this product if adopt the nitrogenize thermal treatment process, because nitriding temperature height (710 ℃) and used time are long, had prolonged the production cycle of product again, energy consumption is big, has correspondingly improved production cost of products.Therefore, in the production of the elastic part of present stage, do not adopt nitrogenize thermal treatment.
The objective of the invention is and to reach and to improve elastic part fatigue resistance and elasticity toughness, to improve the work-ing life of elastic part for elastic part provides a kind of heat treating method that can overcome above-mentioned contradiction.
The objective of the invention is to realize with following technical scheme.Hot treating method for elastic parts of the present invention comprises quenching, 400-500 ℃ temperature tempering under 850 ℃ ± 10 ℃ temperature, blast, the surface is cleaned with clean-out system, put into nitriding furnace and carry out the thermal treatment of vacuum pulse tufftride, 400-500 ℃ of vacuum pulse tufftride thermal treatment temp, heat treatment time 4-6 hour, nitride dielectric layer was ammonia (NH
3), feed N afterwards
2Shielding gas, the oil cooling of coming out of the stove after being cooled to 300 ℃ is tempered to 200 ℃ of air coolings again.
Vacuum pulse tufftride heat-treating methods is, elastic part after cleaning deoiled is packed in the vacuum nitriding heat treatment furnace, build bell, be warmed up to nitriding temperature 400-500 ℃, when being evacuated in the required vacuum tightness then as 1-10 holder (TO γ γ), stop to vacuumize, import ammonia in nitriding furnace, after ammonia was heated, the part ammonia decomposed, (N) active atomic part that decomposites is absorbed by piece surface, and a part is combined into molecule nitrogen (N rapidly
2), N
2With the hydrogen molecule (H that decomposes generation
2) and undecomposed NH
3Becoming waste gas is in time extracted out by pumped vacuum systems, so just can prevent in time that hydrogen from being absorbed the generation hydrogen embrittlement by piece surface, after generally vacuumizing, input ammonia to pressure is the 300-350 holder, keep-uped pressure 50-60 minute, vacuumized again afterwards 1-2 minute, the input ammonia, pulse cycle like this, about 65 minutes of working cycle each time.In vacuum tufftride process, ammonia decomposes the status nascendi nitrogen-atoms promptly active (N) that produces, because chemically reactive is big, volume is little, easily absorbed by the steel surface, remaining in time discharge by vacuum at short notice at part hydrogen etc., greatly reduce hydrogen and infiltrate the hazardness that piece surface produces hydrogen embrittlement.
Elastic part is carried out gas soft nitriding thermal treatment in thermo-chemical treatment, belong to the longest processing method of production cycle, extend manufacture cycle, cause production cost to raise.For accelerating the gas nitriding heat treatment process, in vacuum tufftride heat treatment process, in nitriding furnace, add rare earth element and make energizer.Be single based raw material with liquefied ammonia promptly, mixed rare earth chlorides is made the gas vacuum tufftride heat-treatment technology method of energizer.
The content (weight percent) of mixed rare earth chlorides middle-weight rare earths element: Ce 26.6%, La 13.8%, Pr 3.4%, Nd 11.4%, Sn 1.3%, Cd 0.32%, Y and other 0.32%, all the other be the chlorine element for accumulative total 57.14%(), to make the energizer using method be relations such as capacity, batch and workpiece shape according to nitriding furnace to mixed rare earth chlorides, the amount of adding mixed rare earth chlorides is the 30-40%(weight percent of liquid chlorine amount).Mixed rare earth chlorides dissolves in the solvent, solvent can adopt methyl alcohol etc., when the thermal treatment of vacuum tufftride, ratio in accordance with regulations, mixed rare earth chlorides solution imported ammonia in nitriding furnace in, in stove, splash into mixed rare earth chlorides.
After in nitriding furnace, adding rare earth element, nitriding medium is had activity urge the effect of oozing, quickened the ammonia scission of link and decomposited activity (N) atom.Under general condition, when decomposing by thermodynamic condition, because the tufftride temperature is low, ammonia is difficult to decompose fully, and helps thermolysis after adding rare earth element, and decomposition kinetics is quickened, and urges the rate of oozing can reach 30-40%.Rare earth element also can promote the nitrogen concentration of infiltration layer to increase, and nitrogen concentration is progressively descended along outside surface to internal layer, helps the raising of material property.The adding of rare earth element can also promote the improvement of diffusion layer organization.In metallurgical process, add trace rare-earth element in the steel, can improve the tissue of steel, improve the over-all properties of steel, obtained abundant affirmation.Use common nitrogenize and add rare earth element urge nitridingization observe relatively with transmission electron microscope * 50000 in discovery: the thicker ripple nitride of common nitrided surface layer appearance, tiny strip nitride has then appearred in rare earth catalytic cementation, and common nitride layer tissue looseness, and add the compound layer dense structure of rare earth nitriding, the nitride shape is short and small simultaneously, and the distribution disperse, confirmed that fully rare earth element urging the surface that also can penetrate into steel when oozing, produces the microalloying effect.Rare earth element also has stronger avidity with hydrogen, thereby the dividing potential drop reduction of hydrogen in the nitriding furnace atmosphere, the nitriding ability of gas are increased, and has therefore significantly reduced the infiltration harm of hydrogen, thereby has avoided " hydrogen embrittlement " phenomenon.
In sum, the present invention has following characteristics: the amount that 1, adopts nitrogen-based atmosphere to carry out thermo-chemical treatment, generation active hydrogen is reduced greatly.2, adopt rare earth to make energizer, because of rare earth and hydrogen have stronger avidity, thereby the dividing potential drop of hydrogen in the atmosphere is reduced, the nitriding ability of gas increases, the infiltration that has therefore significantly reduced hydrogen endangers.3, adopt the vacuum pulse tufftride, ammonia decomposes the status nascendi nitrogen-atoms that produces because chemically reactive is big, volume is little, easily absorbed by the steel surface, and remaining most of hydrogen atom is in time discharged in company with the waste gas vacuum, greatly reduces the intrusion harm of hydrogen.
Embodiment one:
With the inventive method to the accessory product on the generating set carbon brush: the little volute spring of non-contact type is heat-treated.This kind volute spring is adopted 850 ℃, in nitrate solution, quenched 30 minutes, tempering is 1.5 hours under 450 ℃ of temperature, after blast cleans, spring is packed in the vacuum pulse tufftride heat treatment furnace, build bell, be warmed to 450 ℃ as the tufftride temperature, under the situation that keeps this temperature, vacuumized 2 minutes, the input ammonia is in nitriding furnace, in nitriding furnace, splash into simultaneously mixed rare earth chlorides solution, the amount of splashing into is the 40%(weight ratio of liquefied ammonia amount), input ammonia to pressure is 350 holders (TO γ γ), keep-uped pressure 60 minutes, vacuumized again 2 minutes, and imported ammonia again and splash into mixed rare earth chlorides solution, so circulation was carried out the vacuum pulse tufftride 4.5 hours.Then pass through N
2Shielding gas is cooled to that 300 ℃ of rear spring are come out of the stove, oil cooling, carries out tempering 1.5 hours with 200 ℃ of temperature again, air cooling after indivedual shapings.Its hardness value of the volute spring of Zhi Zaoing is controlled between HRC:39-42 ° like this, improved the 3-4 limit of doubly promptly being on active service than the like product of domestic production technique manufacturing commonly used at present work-ing life and brought up to 24-32.6 more than ten thousand time by 6.5 ten thousand times, product surface has the nitrogenize lubricant film layer, has the anticorrosion antiwear effect, surface color is a mazarine, and the excellent decoration effect is arranged.
Embodiment two
With heat treating method of the present invention to the butterfly spring of the important half elliptic spring in the electric locomotive, valve, important accessory contact-type volute spring on the electromagnetism weight handling equipment such as δ 1.6 * 80 * 164000mm(thick * wide * length) etc. the elastic part product heat-treat, make the hardness value of product be controlled at optimum range (HRC39-42 ℃), be that length of service generally improves 3-4 doubly work-ing life, and have good anticorrosion antiwear, specious.
Hot treating method for elastic parts technology of the present invention is simple, is easy to promote, be suitable for the thermal treatment of elastic part.
Claims (3)
1, a kind of hot treating method for elastic parts, comprise with elastic part under 850 ℃ ± 10 ℃ temperature, quench, 400-500 ℃ temperature tempering, blast, it is characterized in that, behind the blast, with clean-out system the surface is cleaned, put into nitriding furnace and carry out the thermal treatment of vacuum pulse tufftride, 400-500 ℃ of vacuum pulse tufftride thermal treatment temp, heat treatment time 4-6 hour, nitride dielectric layer was ammonia (NH
3), feed N afterwards
2Shielding gas is cooled to 300 ℃, the oil cooling of coming out of the stove, be tempered to 200 ℃ again after air cooling.
2, hot treating method for elastic parts according to claim 1 when it is characterized in that carrying out the thermal treatment of vacuum pulse tufftride in the nitriding furnace, adds rare earth nitride as energizer.
3, hot treating method for elastic parts according to claim 2, the amount that it is characterized in that the rare earth chloride that adds is the 30-40% of the ammonia amount that adds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91106725 CN1067684A (en) | 1991-06-15 | 1991-06-15 | Hot treating method for elastic parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91106725 CN1067684A (en) | 1991-06-15 | 1991-06-15 | Hot treating method for elastic parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1067684A true CN1067684A (en) | 1993-01-06 |
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ID=4908107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91106725 Pending CN1067684A (en) | 1991-06-15 | 1991-06-15 | Hot treating method for elastic parts |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1067684A (en) |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597681A (en) * | 2009-07-09 | 2009-12-09 | 贵州大学 | A kind of process for heat-treatment on spring steel product for high-speed heavy-load trains |
| CN101907145A (en) * | 2010-08-23 | 2010-12-08 | 西安航空动力股份有限公司 | Forming method for high-temperature alloy sine bellows spring |
| CN102168165A (en) * | 2011-03-18 | 2011-08-31 | 西安东风仪表厂 | Heat treatment method for breaking pin |
| CN102191453A (en) * | 2010-03-08 | 2011-09-21 | 马建伟 | Rice sieve, and composite heat treatment method for sieve sheet with long and round pores |
| CN102489943A (en) * | 2011-11-28 | 2012-06-13 | 贵州红林机械有限公司 | Method for manufacturing waved springs |
| CN102791890A (en) * | 2010-03-18 | 2012-11-21 | 日本发条株式会社 | Spring steel and surface treatment method for steel material |
| CN102925852A (en) * | 2012-11-19 | 2013-02-13 | 常州天山重工机械有限公司 | Technique for eliminating nitrided porosity |
| CN103526153A (en) * | 2012-07-03 | 2014-01-22 | 山东科技大学 | Nitriding method |
| CN103849742A (en) * | 2012-11-29 | 2014-06-11 | 中国航空工业标准件制造有限责任公司 | Heat treatment process for steel elastic part |
| CN103849830A (en) * | 2014-03-29 | 2014-06-11 | 蚌埠铁路五金建材总厂 | Catalytic penetrating agent applied to nitriding treatment of railway public-work fittings |
| CN104480424A (en) * | 2014-12-02 | 2015-04-01 | 贵州红林机械有限公司 | Method for nitriding nitrided steel 135 material |
| CN105385825A (en) * | 2015-11-13 | 2016-03-09 | 哈尔滨东安发动机（集团）有限公司 | Repairing method for belleville springs with disqualified elasticity value |
| CN105385824A (en) * | 2015-11-13 | 2016-03-09 | 哈尔滨东安发动机（集团）有限公司 | Method for improving elasticity value yield of belleville spring |
| CN105624371A (en) * | 2015-12-30 | 2016-06-01 | 平高集团有限公司 | Manufacturing method for switching-closing half shaft of high-voltage vacuum circuit breaker and switching-closing half shaft of high-voltage vacuum circuit breaker |
| CN106213700A (en) * | 2016-08-31 | 2016-12-14 | 福建浔兴拉链科技股份有限公司 | A kind of production technology of punching press pull head |
| CN106399917A (en) * | 2016-12-09 | 2017-02-15 | 贵州西南工具(集团)有限公司 | Surface nitriding treatment process of hard alloy cutter |
| CN106987793A (en) * | 2017-06-01 | 2017-07-28 | 广东华昌铝厂有限公司 | H13 steel molds nitrogenation treatment technology again |
| CN110607430A (en) * | 2019-10-21 | 2019-12-24 | 江苏华海钢结构有限公司 | Heat treatment process of high-strength spring |
| CN110747318A (en) * | 2019-12-04 | 2020-02-04 | 界首市锦田农业机械装备有限公司 | Compression-resistant treatment method for hot coil spring |
| CN113913834A (en) * | 2021-10-25 | 2022-01-11 | 杭州汉派模具科技有限公司 | Ring die composite hardening process |
-
1991
- 1991-06-15 CN CN 91106725 patent/CN1067684A/en active Pending
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597681A (en) * | 2009-07-09 | 2009-12-09 | 贵州大学 | A kind of process for heat-treatment on spring steel product for high-speed heavy-load trains |
| CN102191453A (en) * | 2010-03-08 | 2011-09-21 | 马建伟 | Rice sieve, and composite heat treatment method for sieve sheet with long and round pores |
| CN102791890A (en) * | 2010-03-18 | 2012-11-21 | 日本发条株式会社 | Spring steel and surface treatment method for steel material |
| CN102791890B (en) * | 2010-03-18 | 2014-05-28 | 日本发条株式会社 | Spring steel and surface treatment method for steel material |
| CN101907145A (en) * | 2010-08-23 | 2010-12-08 | 西安航空动力股份有限公司 | Forming method for high-temperature alloy sine bellows spring |
| CN102168165A (en) * | 2011-03-18 | 2011-08-31 | 西安东风仪表厂 | Heat treatment method for breaking pin |
| CN102168165B (en) * | 2011-03-18 | 2013-01-16 | 西安东风仪表厂 | Heat treatment method for breaking pin |
| CN102489943A (en) * | 2011-11-28 | 2012-06-13 | 贵州红林机械有限公司 | Method for manufacturing waved springs |
| CN103526153A (en) * | 2012-07-03 | 2014-01-22 | 山东科技大学 | Nitriding method |
| CN102925852A (en) * | 2012-11-19 | 2013-02-13 | 常州天山重工机械有限公司 | Technique for eliminating nitrided porosity |
| CN103849742A (en) * | 2012-11-29 | 2014-06-11 | 中国航空工业标准件制造有限责任公司 | Heat treatment process for steel elastic part |
| CN103849830A (en) * | 2014-03-29 | 2014-06-11 | 蚌埠铁路五金建材总厂 | Catalytic penetrating agent applied to nitriding treatment of railway public-work fittings |
| CN104480424A (en) * | 2014-12-02 | 2015-04-01 | 贵州红林机械有限公司 | Method for nitriding nitrided steel 135 material |
| CN105385825A (en) * | 2015-11-13 | 2016-03-09 | 哈尔滨东安发动机（集团）有限公司 | Repairing method for belleville springs with disqualified elasticity value |
| CN105385824A (en) * | 2015-11-13 | 2016-03-09 | 哈尔滨东安发动机（集团）有限公司 | Method for improving elasticity value yield of belleville spring |
| CN105624371A (en) * | 2015-12-30 | 2016-06-01 | 平高集团有限公司 | Manufacturing method for switching-closing half shaft of high-voltage vacuum circuit breaker and switching-closing half shaft of high-voltage vacuum circuit breaker |
| CN106213700A (en) * | 2016-08-31 | 2016-12-14 | 福建浔兴拉链科技股份有限公司 | A kind of production technology of punching press pull head |
| CN106213700B (en) * | 2016-08-31 | 2019-02-01 | 福建晋江浔兴拉链科技有限公司 | A kind of production technology of punching press pull head |
| CN106399917A (en) * | 2016-12-09 | 2017-02-15 | 贵州西南工具(集团)有限公司 | Surface nitriding treatment process of hard alloy cutter |
| CN106987793A (en) * | 2017-06-01 | 2017-07-28 | 广东华昌铝厂有限公司 | H13 steel molds nitrogenation treatment technology again |
| CN106987793B (en) * | 2017-06-01 | 2019-07-30 | 广东华昌铝厂有限公司 | H13 steel mold nitrogenation treatment technology again |
| CN110607430A (en) * | 2019-10-21 | 2019-12-24 | 江苏华海钢结构有限公司 | Heat treatment process of high-strength spring |
| CN110747318A (en) * | 2019-12-04 | 2020-02-04 | 界首市锦田农业机械装备有限公司 | Compression-resistant treatment method for hot coil spring |
| CN113913834A (en) * | 2021-10-25 | 2022-01-11 | 杭州汉派模具科技有限公司 | Ring die composite hardening process |
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