CN103266218A - Steel bearing part for process of eliminating mixed crystals and machining method of steel bearing part - Google Patents
Steel bearing part for process of eliminating mixed crystals and machining method of steel bearing part Download PDFInfo
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- CN103266218A CN103266218A CN2013102213953A CN201310221395A CN103266218A CN 103266218 A CN103266218 A CN 103266218A CN 2013102213953 A CN2013102213953 A CN 2013102213953A CN 201310221395 A CN201310221395 A CN 201310221395A CN 103266218 A CN103266218 A CN 103266218A
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Abstract
The invention provides a steel bearing part for a process of eliminating mixed crystals and a machining method of the steel bearing part. The steel bearing part comprises a loop, an inner ring and a rolling element, wherein the rolling element is arranged between the loop and the inner ring, the loop is connected with a bearing seat hole, the inner ring is connected with an axle, the loop is provided with and inclined flange, the inner ring is provided with flanges of different heights, and the loop and the rolling element are quenched in a vacuum air quenching furnace. According to the steel baring part and the machining method provided by the invention, the production efficiency can be improved, the production technology can be optimized, and the technical problem that crystal particles grow up abnormally in the vacuum heat treatment process of Cr4Mo4V and W9Cr4V2Mo steel bearing loops or the rolling elements in practical production.
Description
(1) technical field
The present invention relates to technical field of bearings, relate in particular to a kind of Materials Processing Engineering design field.
(2) background technology
Cr4Mo4V and W9Cr4V2Mo steel quench in vacuum air-quenching furnace, the phenomenon (abbreviation mixed crystal) that crystal grain is grown up unusually often occurs.The reason of " mixed crystal ", by the system process experimental study, determine that influence factor is influenced by the starting material grain fineness number mainly: the one, starting material grain fineness number " heredity " problem, the annealed material that steel mill pays " mixed crystal " occurring in the quenching process subsequently through turning machine-shaping; The 2nd, raw-material grain fineness number adopt to be forged processing mode, can not effectively improve, the crystal grain thinning degree.
Cr4Mo4V and W9Cr4V2Mo steel bearing ring or rolling body if there is " mixed crystal " phenomenon in fabricated part, under the repeated load working condition, directly influence life-span and the reliability of bearing.
Equipped and Technology limits, Cr4Mo4V and W9Cr4V2Mo steel bearing ring or rolling body mainly adopted salt bath quenching in the past, and in the face of complex construction Special-shaped bearing lasso, salt bath quenching exists at aspects such as surface quality of workpieces assurances, residual salt processing and is short of.
(3) summary of the invention
The object of the present invention is to provide a kind ofly can enhance productivity, optimization production technology, solve among the Cr4Mo4V and W9Cr4V2Mo steel bearing ring or rolling body vacuum heat treatment process in the actual production grow up the unusually steel bearing parts of elimination mixed crystal technology of technical barrier of crystal grain.
The object of the present invention is achieved like this: it comprises lasso 1, inner ring 2 and rolling body 3, rolling body 3 is arranged between lasso 1 and the inner ring 2, lasso 1 is connected with bearing saddle bore, inner ring 2 is connected with axle, lasso is provided with inclined flange, inner ring is provided with not contour rib, and lasso and rolling body be the process quench treatment in vacuum air-quenching furnace.
Another object of the present invention is to provide a kind of working method of steel bearing parts of above-mentioned elimination mixed crystal technology, it is achieved in that lasso or rolling body quench and occurs needing to carry out anneal before the mixed crystal in vacuum air-quenching furnace, the annealing device of lasso after forging is the 75KW cabinet-type electric furnace, the rolling body annealing device is 180KW chassis resistance furnace, the annealing process flow process is: preheating → whole heat → isothermal → cooling, wherein preheating temperature is 740 ~ 760 ℃, and be 3 hours warm up time; Hot temperature is 850 ~ 870 ℃ eventually, and the hot time is 6 ~ 7 hours eventually; 750 ~ 770 ℃ of isothermal temperatures, isothermal time are 11 ~ 12 hours, and the type of cooling is to be cooled to 680 ℃ with 20 ℃/hour, and stove is chilled to 500 ~ 550 ℃ of air coolings of coming out of the stove.Mixed crystal occurs after the back tempering of in vacuum oven, quenching of annealing and need adopt additional anneal, additional annealing device is B84T vacuum air-quenching furnace or V0Q2-150 double-chamber vacuum oil quenching furnace, replenishing the annealing process flow process is preheating → whole heat → isothermal → cooling, wherein the preheating temperature of additional annealing is 745 ~ 755 ℃, and be 2 hours warm up time; Hot temperature is 850 ~ 860 ℃ eventually, and the hot time is 3 ~ 5 hours eventually; 725 ~ 735 ℃ of isothermal temperatures, isothermal time are 9 ~ 11 hours, and the type of cooling is for being cooled to the air cooling of coming out of the stove below 200 ℃.
The present invention replenishes the former relatively technology of annealing process, and vacuum oven is all realized control automatically, and aspects such as temperature-controlled precision and temperature uniformity all are better than chamber type electric resistance furnace.Additional annealing can excite carbide " pinning " effect, the disperse of carbide is separated out, evenly distribute, and stops crystal boundary to merge, and effectively stops crystal grain to be grown up unusually.
Cr4Mo4V of the present invention and W9Cr4V2Mo steel bearing ring or rolling body adopt the high-performance vacuum air-quenching furnace to heat-treat, can guarantee the thermal treatment of high-performance bearing part at aspects such as temperature-controlled precision, temperature uniformities, aspect surface quality of workpieces, have good assurance ability simultaneously.
In Cr4Mo4V and W9Cr4V2Mo steel bearing ring or the rolling body vacuum heat treatment process, the reason that " mixed crystal " occur is in heating, the insulating process, because of material grains degree " heredity ", causes the crystal boundary of adjacent crystal grain to merge the unusual thick crystal grain of formation mutually.
The present inventionThe research of technique of Cr4Mo4V and W9Cr4V2Mo Heat Treatment Of Steel " mixed crystal " is at first merged problem mutually from the crystal boundary that Technology solves the adjacent crystal grain that causes because of material " heredity ".So, how stoping crystal boundary to merge is the gordian technique that solves thermal treatment " mixed crystal ", and stoping the effective means that crystal boundary merges is carbide " pinning " effect, and the disperse of carbide is separated out, evenly distributed and can effectively stop crystal grain to be grown up unusually.Based on above-mentioned theory, the annealing process of Cr4Mo4V and W9Cr4V2Mo steel has been launched technological test and the research of system, by a large amount of technological tests and test analysis, finally formed the additional annealing process of optimizing.
The present inventionCr4Mo4V and W9Cr4V2Mo Heat Treatment Of Steel, the crystal boundary that has solved the adjacent crystal grain that causes because of material " heredity " merges problem mutually, and " pinning " effect of carbide, the disperse of carbide are separated out, are evenly distributed and can effectively stop crystal grain to be grown up unusually.Cr4Mo4V and W9Cr4V2Mo steel raw material car workpieces, forging car workpieces are anticipated by the additional annealing of optimizing, organize obvious refinement, part heat treatment technics index and mechanical property are not had influence, efficiently solve " mixed crystal " Technology difficult problem in the vacuum heat treatment process.
(4) description of drawings
Fig. 1 is structural representation of the present invention.
(5) embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments:
In conjunction with Fig. 1, present embodiment comprises lasso 1, inner ring 2 and rolling body 3, rolling body 3 is arranged between lasso 1 and the inner ring 2, lasso 1 is connected with bearing saddle bore, inner ring 2 is connected with axle, lasso is provided with inclined flange, and inner ring is provided with not contour rib, and lasso and rolling body be the process quench treatment in vacuum air-quenching furnace.Lasso or rolling body quench in vacuum air-quenching furnace and occur needing to carry out anneal before the mixed crystal, the annealing device of lasso after forging is the 75KW cabinet-type electric furnace, the rolling body annealing device is 180KW chassis resistance furnace, the annealing process flow process is: preheating → whole heat → isothermal → cooling, wherein preheating temperature is 740 ~ 760 ℃, and be 3 hours warm up time; Hot temperature is 850 ~ 870 ℃ eventually, and the hot time is 6 ~ 7 hours eventually; 750 ~ 770 ℃ of isothermal temperatures, isothermal time are 11 ~ 12 hours, and the type of cooling is to be cooled to 680 ℃ with 20 ℃/hour, and stove is chilled to 500 ~ 550 ℃ of air coolings of coming out of the stove.Mixed crystal occurs after the back tempering of in vacuum oven, quenching of annealing and need adopt additional anneal, additional annealing device is B84T vacuum air-quenching furnace or V0Q2-150 double-chamber vacuum oil quenching furnace, replenishing the annealing process flow process is preheating → whole heat → isothermal → cooling, wherein the preheating temperature of additional annealing is 745 ~ 755 ℃, and be 2 hours warm up time; Hot temperature is 850 ~ 860 ℃ eventually, and the hot time is 3 ~ 5 hours eventually; 725 ~ 735 ℃ of isothermal temperatures, isothermal time are 9 ~ 11 hours, and the type of cooling is for being cooled to the air cooling of coming out of the stove below 200 ℃.
Claims (2)
1. steel bearing parts of eliminating mixed crystal technology, it is characterized in that it comprises lasso, inner ring and rolling body, rolling body is arranged between lasso and the inner ring, lasso is connected with bearing saddle bore, inner ring is connected with axle, lasso is provided with inclined flange, and inner ring is provided with not contour rib, and lasso and rolling body be the process quench treatment in vacuum air-quenching furnace.
2. the working method of the steel bearing parts of an elimination mixed crystal technology according to claim 1, it is characterized in that lasso or rolling body quench in vacuum air-quenching furnace occurs needing to carry out anneal before the mixed crystal, the annealing device of lasso after forging is the 75KW cabinet-type electric furnace, the rolling body annealing device is 180KW chassis resistance furnace, the annealing process flow process is: preheating → whole heat → isothermal → cooling, wherein preheating temperature is 740 ~ 760 ℃, and be 3 hours warm up time; Hot temperature is 850 ~ 870 ℃ eventually, and the hot time is 6 ~ 7 hours eventually; 750 ~ 770 ℃ of isothermal temperatures, isothermal time are 11 ~ 12 hours, and the type of cooling is to be cooled to 680 ℃ with 20 ℃/hour, and stove is chilled to 500 ~ 550 ℃ of air coolings of coming out of the stove; Mixed crystal occurs after the back tempering of in vacuum oven, quenching of annealing and need adopt additional anneal, additional annealing device is B84T vacuum air-quenching furnace or V0Q2-150 double-chamber vacuum oil quenching furnace, replenishing the annealing process flow process is preheating → whole heat → isothermal → cooling, wherein the preheating temperature of additional annealing is 745 ~ 755 ℃, and be 2 hours warm up time; Hot temperature is 850 ~ 860 ℃ eventually, and the hot time is 3 ~ 5 hours eventually; 725 ~ 735 ℃ of isothermal temperatures, isothermal time are 9 ~ 11 hours, and the type of cooling is for being cooled to the air cooling of coming out of the stove below 200 ℃.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104162766A (en) * | 2014-07-15 | 2014-11-26 | 安庆银泰轴承有限公司 | Production technology of high-precision deep groove ball bearing |
| CN104476140A (en) * | 2014-12-19 | 2015-04-01 | 常熟市常轴轴承有限公司 | Turning processing technique for flange of angular contact bearing |
| CN109182667A (en) * | 2018-11-13 | 2019-01-11 | 东莞市国森科精密工业有限公司 | A kind of method that 40CrNiMoA steel forgings grain size improves |
| CN112824545A (en) * | 2019-11-20 | 2021-05-21 | 辽宁银捷装备科技股份有限公司 | Process method for solving serious mixed crystal problem of high-temperature bearing steel W9Cr4V2Mo |
| CN113061712A (en) * | 2021-03-23 | 2021-07-02 | 中国航发哈尔滨轴承有限公司 | Method for eliminating mixed crystals in heat treatment of W9Cr4V2Mo steel bearing parts |
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| CN203382800U (en) * | 2013-06-06 | 2014-01-08 | 中航工业哈尔滨轴承有限公司 | Steel bearing part for removing mixed crystal process |
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| CN1930402A (en) * | 2004-03-10 | 2007-03-14 | Ntn株式会社 | Bearing device for wheel |
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| CN101903667A (en) * | 2007-12-17 | 2010-12-01 | Ntn株式会社 | Double-row angular bearing, bearing device for wheel, method of producing outer ring, and method of producing inner ring |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104162766A (en) * | 2014-07-15 | 2014-11-26 | 安庆银泰轴承有限公司 | Production technology of high-precision deep groove ball bearing |
| CN104476140A (en) * | 2014-12-19 | 2015-04-01 | 常熟市常轴轴承有限公司 | Turning processing technique for flange of angular contact bearing |
| CN109182667A (en) * | 2018-11-13 | 2019-01-11 | 东莞市国森科精密工业有限公司 | A kind of method that 40CrNiMoA steel forgings grain size improves |
| CN112824545A (en) * | 2019-11-20 | 2021-05-21 | 辽宁银捷装备科技股份有限公司 | Process method for solving serious mixed crystal problem of high-temperature bearing steel W9Cr4V2Mo |
| CN113061712A (en) * | 2021-03-23 | 2021-07-02 | 中国航发哈尔滨轴承有限公司 | Method for eliminating mixed crystals in heat treatment of W9Cr4V2Mo steel bearing parts |
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Application publication date: 20130828 |