CN1670256A - Method for supplementing carbon on machine element surface - Google Patents
Method for supplementing carbon on machine element surface Download PDFInfo
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- CN1670256A CN1670256A CN 200510065356 CN200510065356A CN1670256A CN 1670256 A CN1670256 A CN 1670256A CN 200510065356 CN200510065356 CN 200510065356 CN 200510065356 A CN200510065356 A CN 200510065356A CN 1670256 A CN1670256 A CN 1670256A
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Abstract
The invention discloses a technique for surface carburization on a mechanic device, which is characterized in including the quality and structure feature of devices that need to be carburized, and the steps of analyzing raw carbon-density distinction of its cross section and designing the carburization technique; shoving, heating, carburizing and supplying carbon on the basis of technological requirements, with technological parameter 780-900 deg., 0.3-1.05CP, 5-20H; quick cooling with a fun or oven based on the technological requirements, after the temperature dropped, quenching and lonnealing and/or power-frequency quenching for one time and checking the ruggedness and/or checking a peeling test with a coupon to said device. The invention is pretty simple, economical, and broad used, available to heavy and large parts with different material qualities and degrees of decarburization, explored a new approach to healings qualities of large equipment.
Description
Technical field
The present invention relates to the ferrous metal carburizing of using gas, relate in particular to the processing method that machinery part surface is mended carbon (replenishing carburizing).
Background technology
Mechanical component usually can be because of a variety of causes causes the workpiece surface decarburization, and the decarburization meeting causes hardness not enough and part is faced scrap.Still can consider to scrap in addition to do for miniature parts, but then must adopt remedial measures, be saved for great type mechanical component.The method of saving is different and different because of decarburization and machine process.Surpass the workpiece of process redundancy for Decarburized layer, can carburetting in carburizing atmosphere, this is referred to as the surface and mends carbon.Adopting surperficial mend carbon technology can successfully save this class workpiece, utilize the combined heat treatment after gas carburizing process is mended carbon and mended carbon workpiece, is the way of reprocessing a kind of easy economy of substandard product.This technology has caused industry colleague's extensive concern.
Summary of the invention
Proposition of the present invention, purpose be to design a kind of be applicable to great type mechanical component satisfy the benefit carbon that its mechanical property, metallographic structure and Deformation control require and the processing method of aftertreatment thereof.
Technical solution of the present invention is achieved in that a kind of processing method of machinery part surface benefit carbon, it is characterized in that comprising:
(1) treats the analysis of the original carbon concentration difference in material, constructional feature and cross section thereof of mending the carbon part and the step of design mend carbon technology;
(2) step of carrying out shove charge, heating, add carbon potential and mend carbon according to processing requirement, its processing parameter is: 780～900 ℃, 0.3～1.05CP, 5～20h;
(3) it is fast cold or stove is cold to carry out blower fan according to processing requirement, carries out the step that primary quenching+low-temperaturetempering handles and/or the step of power frequency heat hardening after the cooling;
(4) above-mentioned part is carried out the step of Hardness Surveillance and/or sample peeling check.
The described cooling back processing parameter that primary quenching+low-temperaturetempering is handled is 830～860 ℃, changes air cooling behind the oil cooling, again 160～400 ℃ of low-temperaturetemperings.
Compared with prior art, advantage of the present invention is conspicuous, mainly shows:
(1) mechanical component to the surface decarburization of unlike material all can adopt this method successfully to mend carbon, make because of the insufficient heavy parts of decarburization hardness obtains saving, and avoid causing financial loss.
(2) to the steel components of different carbon content, all can make the upper layer after the decarburization return to original composition, take off several millimeters, can mend several millimeters.
(3) the cementation zone concentration gradient that forms by this law transition and linkage just in time makes it moltenly be one, mends carbon and combines well no pipe phenomenon with Decarburized layer.
Description of drawings
Fig. 1 is 20CrNi of the present invention
2MoA, gear shaft is mended carbon and heat treatment cycle curve figure thereof.
Fig. 2 is the benefit carbon and the heat treatment cycle curve figure thereof of 45# carbon junction steel deflector roll of the present invention.
Embodiment
Embodiment 1 20CrNi
2MoA steel carburized gears axle (specification ∮ 589 * 2422), cooling direct primary quenching+high tempering+secondary quenching is defective because of hardness after the low-temperaturetempering after carburizing, carries out primary quenching again.Finding that quality is still defective, can not reach technical requirements, mainly is that tooth face hardness is on the low side.Technical requirements tooth face hardness HRC57～62, and the measured hardness value is HRC48～55.This batch gear shaft finished product weighs 5.5 tons, and twice quenching if handle badly again, even hardness reaches requirement, is out of shape and overproofly also can only be scrapped.
Therefore, save these gear shafts, only allow quenching press meeting once,, only scrap as unsuccessful again.How to catch one last chance to handle successfully, just put forward as key issue.By analysis, we think and have caused flank of tooth decarburization by the gear shaft after twice quenching, cause the surface to cause that because of carbon content is not enough hardness is on the low side.So, quench again after must mending carbon to this gear shaft, to reach the specification of quality of part.
The contriver considers to change twice quenching after the carburizing in the past into primary quenching, and the corresponding mend carbon technology of having chosen.Carburizing temperature is adjusted into 900 ℃, and this is to consider to reduce to quench to heat the distortion that cooling causes.Adopt fan starting to be chilled to 840 ℃ soon, and being arranged in diffusion carbon drop gesture quenched after 1 hour, the diffusion period carbon-potential control is at (0.85 ± 0.1) %, help avoiding forming carbide network, cooling is quenched and can be reduced remained austenite content and obtain infiltration layer fine martensite tissue, and guarantees that hardness is qualified.
After testing, net result is:
Deflection: survey common normal maximum deformation quantity 0.18MM, least amount of deformation 0.04MM satisfies the drawing requirement.
Tooth face hardness: three gear shafts are respectively: HRC59, HRC57, HRC55.6
Three gear shafts of this batch have successfully been saved from the edge of scrapping.
Embodiment 2 45# carbon junction steels 12 backup guide rolls, specification ∮ 220 * 462, and quenching and tempering hardness is HB260 ~ 280, and is improper because of procedure arrangement, causes surface decarburization, so hardness is low excessively after the medium frequency quenching, technical requirements hardness HRC40 ~ 45, and actual measurement can only reach HRC20 ~ 30.In view of the production cycle, this batch deflector roll can only be saved reuse, can not scrap.
Because about the only surplus 0.1MM of finishing allowance, adopt the surface to mend carbon and quench, then deflection is big, might cause scrapping.For this reason, must proposition can preventing deformation and overheated, can reach the thermal treatment process of mending the carbon purpose again, to reach the purpose of saving this batch part.
Mend carbon technology process and parameter are:
A, carburizing temperature: 920～930 ℃ of carburizings of breaking the normal procedure, be revised as 860 ℃ of carburizings, purpose is to reduce distortion, also avoids grain growth.
B, quenchant:,, adopt oil quenching for guaranteeing the performance of deflector roll after modified because of this workpiece material is not a converted steel.
C, carbon-potential control: 45
#The average carbon content of steel is about 0.45%, also should be controlled at 45 when mending carbon
#The composition scope of steel can not exceed standard, and can not change the original material composition.In view of the carburizing later stage also need spread, so carbon potential is 0.5% when setting carburizing.During processing, be with 35 in the stove
#The steel coupon is checked carbon potential and depth of penetration, requires cementation zone to reach 1.0MM, and surface carbon concentration is 0.5%.Analytical study result: do the peeling experiment: coupon surface 0 ~ 0.2MM, C%=0.44%; Coupon surface 0.2 ~ 0.5MM, C%=0.47% is all at acceptability limit.
Case depth: 1.3MM.
Oil quenching after the carburizing, the intermediate frequency hard surfacing with 400 ℃ of tempering, is changeed then in surface hardness actual measurement HB280 ~ 300.Adopt 500KW medium frequency quenching equipment, select f=2000Hz, power is that 200KW adds hotlist continuously and quenches.Temper number is HRC40 ~ 45.
Claims (2)
1, a kind of machinery part surface is mended the processing method of carbon, it is characterized in that comprising:
(1) treats the analysis of the original carbon concentration difference in material, constructional feature and cross section thereof of mending the carbon part and the step of design mend carbon technology;
(2) step of carrying out shove charge, heating, add carbon potential and mend carbon according to processing requirement, its processing parameter is: 780～900 ℃, 0.3～1.05CP, 5～20h;
(3) it is fast cold or stove is cold to carry out blower fan according to processing requirement, carries out the step that primary quenching+low-temperaturetempering handles and/or the step of power frequency heat hardening after the cooling;
(4) above-mentioned part is carried out the step of Hardness Surveillance and/or sample peeling check.
2, machinery part surface according to claim 1 is mended the processing method of carbon, it is characterized in that the described cooling back processing parameter that primary quenching+low-temperaturetempering is handled is 830～860 ℃, changes air cooling behind the oil cooling, again 160～400 ℃ of low-temperaturetemperings.
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| CNB2005100653564A CN1304624C (en) | 2005-03-29 | 2005-03-29 | Method for supplementing carbon on machine element surface |
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| CNB2005100653564A CN1304624C (en) | 2005-03-29 | 2005-03-29 | Method for supplementing carbon on machine element surface |
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| CN1304624C CN1304624C (en) | 2007-03-14 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100473762C (en) * | 2006-08-31 | 2009-04-01 | 上海汽车变速器有限公司 | Hot processing method for removing decarbonizing of steel surface |
| CN100554520C (en) * | 2007-09-25 | 2009-10-28 | 青岛征和工业有限公司 | Precision piece part watch surface chromium base alloy carbides cladding process method |
| CN112296116A (en) * | 2020-09-17 | 2021-02-02 | 江苏华久辐条制造有限公司 | Manufacturing process of high-strength spoke |
| CN112695270A (en) * | 2020-12-22 | 2021-04-23 | 内蒙古北方重工业集团有限公司 | Carburization supplementing process for surface decarburization of medium-carbon alloy structural steel stamping quenching part |
| CN114438288A (en) * | 2022-01-13 | 2022-05-06 | 中车福伊特传动技术(北京)有限公司 | Quenching method for material defect gear |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85100188B (en) * | 1985-04-01 | 1988-09-07 | 陕西机械学院 | Track nitrogen moderate temp. gas carburization technology |
| KR100592757B1 (en) * | 2002-06-11 | 2006-06-26 | 고요 써모시스템 주식회사 | Method of gas carburizing |
| WO2004111292A1 (en) * | 2003-06-12 | 2004-12-23 | Koyo Thermo Systems Co., Ltd. | Method of gas carburizing |
-
2005
- 2005-03-29 CN CNB2005100653564A patent/CN1304624C/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100473762C (en) * | 2006-08-31 | 2009-04-01 | 上海汽车变速器有限公司 | Hot processing method for removing decarbonizing of steel surface |
| CN100554520C (en) * | 2007-09-25 | 2009-10-28 | 青岛征和工业有限公司 | Precision piece part watch surface chromium base alloy carbides cladding process method |
| CN112296116A (en) * | 2020-09-17 | 2021-02-02 | 江苏华久辐条制造有限公司 | Manufacturing process of high-strength spoke |
| CN112695270A (en) * | 2020-12-22 | 2021-04-23 | 内蒙古北方重工业集团有限公司 | Carburization supplementing process for surface decarburization of medium-carbon alloy structural steel stamping quenching part |
| CN114438288A (en) * | 2022-01-13 | 2022-05-06 | 中车福伊特传动技术(北京)有限公司 | Quenching method for material defect gear |
| CN114438288B (en) * | 2022-01-13 | 2024-04-26 | 中车福伊特传动技术(北京)有限公司 | Material defect gear quenching method |
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| CN1304624C (en) | 2007-03-14 |
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Owner name: HUARUI WIND ELECTRICITY TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: DALIAN HEAVY INDUSTRY CRANE GROUP CO., LTD. Effective date: 20081010 |
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Effective date of registration: 20081010 Address after: 19 floor, cultural building, No. 59 Zhongguancun street, Beijing, Haidian District Patentee after: Sinovel Wind Co., Ltd. Address before: No. 169 Bayi Road, Xigang District, Liaoning, Dalian Patentee before: Huarui Co., Ltd., Dalian |
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Assignee: Sinovel Wind Technology (Jiangsu) Co., Ltd. Assignor: Sinovel Wind Co., Ltd. Contract fulfillment period: 2009.3.19 to 2015.3.18 contract change Contract record no.: 2009990000220 Denomination of invention: Method for supplementing carbon on machine element surface Granted publication date: 20070314 License type: exclusive license Record date: 2009.3.25 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.3.19 TO 2015.3.18; CHANGE OF CONTRACT Name of requester: HUARUI WIND POWER TECHNOLOGY( JIANGSU ) CO., LTD. Effective date: 20090325 |