CN104357622A - Local softening method of high-strength alloy steel carburized parts - Google Patents
Local softening method of high-strength alloy steel carburized parts Download PDFInfo
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- CN104357622A CN104357622A CN201410625881.6A CN201410625881A CN104357622A CN 104357622 A CN104357622 A CN 104357622A CN 201410625881 A CN201410625881 A CN 201410625881A CN 104357622 A CN104357622 A CN 104357622A
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- locking pin
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/46—Salt baths
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- Mechanical Engineering (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention relates to the field of local annealing heat treatment of carburized parts and specifically relates to a local softening method of high-strength alloy steel carburized parts. The local softening method can be applied to manufacturing the carburized parts having different requirements on the hardness of the high-strength steel. A carburized locking pin is locally heated by use of fused salt in a salt-bath furnace; the locking pin is made of martensitic steel 16Cr3NiWMoVNbE; an annealing heat-protective fixture is adopted for performing heat protection on the carburized surface of the locking pin part, and the local annealing part is heated till a temperature above 600 DEG C for softening. The local softening method of the high-strength alloy steel carburized parts is capable of reducing the hardness of the flaring positions of the parts and preventing the parts from cracking in the flaring process under the condition of guaranteeing the hardness of the carburized surfaces. According to the local softening method, the method of rapid heating annealing by use of protective salt bath is adopted for performing annealing treatment on the gear locking pin, so that the high strength of the carburized surface and the base body of the part can be prevented from reduction, and the hardness of the portion needing to be deformed can be reduced, and as a result, the cracking problem in the flaring deformation process of the part is solved.
Description
Technical field
The present invention relates to carburizing part spot anneling Field of Heat-treatment, be specially a kind of high-strength alloy steel carburizing product local softening method, the carburized parts manufacture of high-strength steel different hardness requirement can be applied.
Background technology
As shown in Figure 1, carburizing locking pin 1 is mounted on transmitting gear, carburizing locking pin 1 part adopts 16Cr3NiWMoVNbE alloy martensite steel making, and carry out carburizing+quenching+low-temperaturetempering process, subassembly carries out local enlarging, because of part hardness under low-temperaturetempering state higher (heart portion more than 44HRC), crack during enlarging, cause part rejection.For preventing from cracking in part flaring process and causing part rejection, need to carry out Spot annealing treatment (hardness HRA≤70.5) to carburizing locking pin 1 part enlarging position 4, be conducive to enlarging to reduce this place's hardness, avoid cracking simultaneously.
Because body material alloying level is high, locking pin 1 part less (Φ 6.2mm × 28.4mm), needs the position less (external diameter Φ 6.2mm × enlarging diameter of phi 3mm × enlarging position 4 width 3mm) of annealing.And, locking pin 1 part is through carburizing+quenching+low-temperaturetempering process, the annealing position of locking pin 1 part enlarging position 4 is adjacent with carburized surface 2, realizes spot anneling under adopting the method such as induction heating, electrolytic solution heating to be all difficult to ensure the condition of carburized surface 2 hardness.As adopted, high frequency is high should heat, and processes ruhmkorff coil difficulty little like this, and the heat affected zone of induction heating is comparatively large, by the carburizing position annealing should not annealed, affects the use properties of locking pin 1 part.As adopted the method for electrolytic solution heating anneal, locking pin 1 part annealing position arrives high temperature, locking pin 1 part brine quenching subsequently instantaneously, cannot realize object of annealing.
Summary of the invention
The object of the present invention is to provide a kind of high-strength alloy steel carburizing product local softening method, under the condition ensureing carburizing surface hardness, reduce the hardness of part enlarging position, prevent flaring process part crack.
Technical scheme of the present invention:
A kind of high-strength alloy steel carburizing product local softening method; the fused salt of salt bath furnace is utilized to realize carburizing locking pin local heating; locking pin adopts martensitic steel 16Cr3NiWMoVNbE; adopt annealing thermal insulation protection frock that thermal insulation protection is entered in locking pin part carburizing face; spot anneling position is heated to more than 600 DEG C temperature, realizes softening.
Described high-strength alloy steel carburizing product local softening method, the annealing position of locking pin part enlarging position is adjacent with the carburized surface of locking pin part, carries out Spot annealing treatment to carburizing locking pin part enlarging position.
Described high-strength alloy steel carburizing product local softening method, annealing thermal insulation protection frock adopts column construction, and the longitudinal direction of column construction offers open holes, and the bottom of thermal insulation protection frock adopts high temperature resistance heat insulating coat; Thermal insulation protection frock is arranged on spacer; the open holes of thermal insulation protection frock is corresponding with the perforate on spacer; perforate on the open holes that one end of locking pin is offered through thermal insulation protection frock and spacer; one end that locking pin stretches out thermal insulation protection frock and spacer is locking pin enlarging position; enlarging position extends below the liquid level of salt bath; by spacer by thermal insulation protection frock and locking pin location, by open holes and spacer, enlarging position and carburized surface are separated completely.
Described high-strength alloy steel carburizing product local softening method; locking pin is loaded thermal insulation protection frock; locking pin part locking place of steady clamping on mechanical transmission bar; according to the scale record scale that spacer side is corresponding; vertically temperature being put at the position of needs annealing is 800 ~ 850 DEG C of fused salts; keep 2 ~ 3 minutes, water-cooled is to room temperature.
Described high-strength alloy steel carburizing product local softening method, the carburized surface hardness requirement >=61HRC of locking pin part, the annealing position hardness requirement≤40HRC of locking pin part.
Design philosophy of the present invention is:
The present invention utilizes that salt bath furnace is simple to operate, rate of heating is fast and can realize the feature of local heating.16Cr3NiWMoVNbE is the martensitic steel that a kind of alloying level is higher, final mechanical property is obtained by quenching+tempering, this material is often applied to the manufacture of carburizing part, low tempering temperatures after carburizing is at 200 ~ 250 DEG C, body material anti-tempered performance is very good, more than 600 DEG C matrix hardnesses start to reduce with the rising of tempering temperature, utilize this point that thermal insulation protection is entered in locking pin part carburizing face, spot anneling position is heated to more than 600 DEG C temperature, realize softening, after the annealing of locking pin parts locally, carburizing face dark yellow and light blue, annealing surface is metal true qualities.
Advantage of the present invention and beneficial effect are:
1, the present invention adopts the method for protection salt bath flash annealing; anneal is carried out to wheel gear locking pin; can ensure that part carburizing face and matrix high strength do not reduce, the hardness needing deformation position can be reduced again, solve the crack problem produced in part enlarging distortion.And the method is simple to operate, efficiency is high, and cost is low, is conducive to realizing single batch of more than one piece continuous seepage.
2, the present invention adopts special thermal insulation protection frock, carries out salt bath local fast heating method and to anneal the crack problem that can solve in flaring process.
3, salt bath thermal treatment is as a kind of heat treating method, has simple to operate, that rate of heating is fast feature, is suitable for entirety or the partial heat treatment of simple, miniature parts.The present invention's the method is applied in the spot anneling of high quality steel carburized parts, and thermal insulation protection measure does not have related data introduction yet, and the method can be applied to similar carburized parts spot anneling.
Accompanying drawing explanation
Fig. 1 is locking pin part schematic diagram.
Fig. 2 is that after the quenching of 16Cr3NiWMoVNbE steel, tempering temperature affects schematic diagram to hardness.
Fig. 3-Fig. 5 is annealing thermal insulation protection frock schematic diagram.Wherein, Fig. 3 is upward view; Fig. 4 is A-A sectional view in Fig. 3; Fig. 5 is the schematic diagram that locking pin part is arranged at thermal insulation protection frock.
In figure, 1 locking pin; 2 carburized surfaces; 3 centre holes; 4 enlarging positions; 5 thermal insulation protection frocks; 6 open holess; 7 high temperature resistance heat insulating coats; 8 liquid levels; 9 spacers.
Embodiment
As shown in Figure 1, centre hole 3 position (end face is 3mm position inwards) of locking pin 1 small end needs annealing softening, locking pin 1 part is through local carburization+quenching+low-temperaturetempering process, the annealing position of locking pin 1 part enlarging position 4 is adjacent with carburized surface 2, carburized surface 2 hardness requirements >=61HRC, annealing position hardness requirement≤40HRC.
As shown in Figure 2, after the quenching of 16Cr3NiWMoVNbE steel, tempering temperature is on the impact of hardness, and tempering temperature is more than 600 DEG C, and matrix hardness starts to reduce with the rising of tempering temperature.
As shown in Figure 3-Figure 5, annealing thermal insulation protection frock 5 adopts the stainless column construction of 304L, and the longitudinal direction of column construction offers open holes 6, and the bottom of thermal insulation protection frock 5 adopts high temperature resistance heat insulating coat 7.Thermal insulation protection frock 5 is arranged on spacer 9; the open holes 6 of thermal insulation protection frock 5 is corresponding with the perforate on spacer 9; perforate on the open holes 6 that one end of locking pin 1 is offered through thermal insulation protection frock 5 and spacer 9; one end that locking pin 1 stretches out thermal insulation protection frock 5 and spacer 9 is enlarging position 4; enlarging position 4 extends the liquid level less than 8 of salt bath; by spacer 9, thermal insulation protection frock 5 and locking pin 1 are located, by open holes 6 and spacer 9, enlarging position 4 and carburized surface 2 are separated completely.Annealing thermal insulation protection frock 5 is provided with locating device (spacer 9) and high temperature resistance heat insulating coat 7, is convenient to immerse salt bath size and control thermal radiation.During annealing operation, regulated the height of thermal insulation protection frock 5 and locking pin 1 according to salt bath liquid level 8 height by locating device, control annealing position.Annealing temperature selects more than 800 DEG C, rapid heating held for some time.
During assembling, make a set of mechanical transmission bar as required, namely want level to hang part, short transverse is adjustable again, according to molten salt bath liquid level, regulates mechanical transmission rod height, and by scale record scale value corresponding to spacer 9 side.
During use; locking pin 1 is loaded thermal insulation protection frock 5; locking pin 1 part locking place of steady clamping on mechanical transmission bar; according to the scale record scale that spacer 9 side is corresponding; vertically temperature being put at the position of needs annealing is 800 ~ 850 DEG C of fused salts, keeps 2 ~ 3 minutes, then lifts into water to room temperature rapidly; realize softening, control can use manual time-keeping heat-up time.In the present embodiment, annealing position hardness reaches 35HRC.
Embodiment result shows, uses the implementation result of the inventive method and economic benefit estimation: can reduce parts locally hardness, avoid part crack in flaring process and scrap.Single piece work cost about 800 yuan, by annual output 300: 800 yuan/part × 300=240,000 yuan.
Claims (5)
1. a high-strength alloy steel carburizing product local softening method; it is characterized in that: utilize the fused salt of salt bath furnace to realize carburizing locking pin local heating; locking pin adopts martensitic steel 16Cr3NiWMoVNbE; adopt annealing thermal insulation protection frock that thermal insulation protection is entered in locking pin part carburizing face; spot anneling position is heated to more than 600 DEG C temperature, realizes softening.
2. according to high-strength alloy steel carburizing product local softening method according to claim 1, it is characterized in that: the annealing position of locking pin part enlarging position is adjacent with the carburized surface of locking pin part, Spot annealing treatment is carried out to carburizing locking pin part enlarging position.
3. according to high-strength alloy steel carburizing product local softening method according to claim 1, it is characterized in that: annealing thermal insulation protection frock adopts column construction, and the longitudinal direction of column construction offers open holes, and the bottom of thermal insulation protection frock adopts high temperature resistance heat insulating coat; Thermal insulation protection frock is arranged on spacer; the open holes of thermal insulation protection frock is corresponding with the perforate on spacer; perforate on the open holes that one end of locking pin is offered through thermal insulation protection frock and spacer; one end that locking pin stretches out thermal insulation protection frock and spacer is locking pin enlarging position; enlarging position extends below the liquid level of salt bath; by spacer by thermal insulation protection frock and locking pin location, by open holes and spacer, enlarging position and carburized surface are separated completely.
4. according to the high-strength alloy steel carburizing product local softening method described in claim 1 or 3; it is characterized in that: locking pin is loaded thermal insulation protection frock; locking pin part locking place of steady clamping on mechanical transmission bar; according to the scale record scale that spacer side is corresponding; vertically temperature being put at the position of needs annealing is 800 ~ 850 DEG C of fused salts; keep 2 ~ 3 minutes, water-cooled is to room temperature.
5., according to the high-strength alloy steel carburizing product local softening method described in claim 1 or 4, it is characterized in that: the carburized surface hardness requirement >=61HRC of locking pin part, the annealing position hardness requirement≤40HRC of locking pin part.
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| CN201410625881.6A CN104357622B (en) | 2014-11-10 | 2014-11-10 | A kind of high-strength alloy steel carburizing product local softening method |
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| CN104357622A true CN104357622A (en) | 2015-02-18 |
| CN104357622B CN104357622B (en) | 2016-07-13 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755887A (en) * | 2016-11-23 | 2017-05-31 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of method for preventing flange crackle after locking pin carburizing |
| CN106755773A (en) * | 2016-12-02 | 2017-05-31 | 哈尔滨东安发动机（集团）有限公司 | The softening method of carburized zone after a kind of CSS 42L pinion steel carburizings |
| CN108624742A (en) * | 2017-03-21 | 2018-10-09 | 福特全球技术公司 | The quick differential annealing of high strength steel |
| CN111719109A (en) * | 2020-06-30 | 2020-09-29 | 东科克诺尔商用车制动技术有限公司 | Method for solving breakage of optical axis and threads of rocker shaft of steering gear |
| CN115283945A (en) * | 2022-07-19 | 2022-11-04 | 陕西法士特齿轮有限责任公司 | High-hardness synchronizer riveting locking pin and machining method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5538943A (en) * | 1978-09-11 | 1980-03-18 | Hitachi Ltd | Locally annealing method for welded structure |
| CN1069217A (en) * | 1991-08-28 | 1993-02-24 | 叶肖音 | The production method of tailor's scissors |
| CN1584068A (en) * | 2004-05-21 | 2005-02-23 | 中国重型汽车集团有限公司 | Local softening process for active umbrella gearing of heavy vehicle |
| CN103233106A (en) * | 2012-11-02 | 2013-08-07 | 重庆长风机器有限责任公司 | Steel heat treatment deformation treatment method |
-
2014
- 2014-11-10 CN CN201410625881.6A patent/CN104357622B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5538943A (en) * | 1978-09-11 | 1980-03-18 | Hitachi Ltd | Locally annealing method for welded structure |
| CN1069217A (en) * | 1991-08-28 | 1993-02-24 | 叶肖音 | The production method of tailor's scissors |
| CN1584068A (en) * | 2004-05-21 | 2005-02-23 | 中国重型汽车集团有限公司 | Local softening process for active umbrella gearing of heavy vehicle |
| CN103233106A (en) * | 2012-11-02 | 2013-08-07 | 重庆长风机器有限责任公司 | Steel heat treatment deformation treatment method |
Non-Patent Citations (1)
| Title |
|---|
| 朱方才，王向明: "合金钢锤头的局部热处理", 《材料研究与应用》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755887A (en) * | 2016-11-23 | 2017-05-31 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of method for preventing flange crackle after locking pin carburizing |
| CN106755773A (en) * | 2016-12-02 | 2017-05-31 | 哈尔滨东安发动机（集团）有限公司 | The softening method of carburized zone after a kind of CSS 42L pinion steel carburizings |
| CN108624742A (en) * | 2017-03-21 | 2018-10-09 | 福特全球技术公司 | The quick differential annealing of high strength steel |
| CN108624742B (en) * | 2017-03-21 | 2021-11-05 | 福特全球技术公司 | Rapid local annealing of high strength steel |
| CN111719109A (en) * | 2020-06-30 | 2020-09-29 | 东科克诺尔商用车制动技术有限公司 | Method for solving breakage of optical axis and threads of rocker shaft of steering gear |
| CN115283945A (en) * | 2022-07-19 | 2022-11-04 | 陕西法士特齿轮有限责任公司 | High-hardness synchronizer riveting locking pin and machining method thereof |
| CN115283945B (en) * | 2022-07-19 | 2024-04-09 | 陕西法士特齿轮有限责任公司 | High-hardness synchronizer riveting locking pin and processing method thereof |
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| CN104357622B (en) | 2016-07-13 |
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Address after: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee after: Chinese Hangfa Shenyang Liming Aero engine limited liability company Address before: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee before: Liming Aeroplane Engine (Group) Co., Ltd., Shenyang City |