CN108754085A - A kind of GCr15 small steels thin-wall bearing ferrule Bainitic hardening process - Google Patents
A kind of GCr15 small steels thin-wall bearing ferrule Bainitic hardening process Download PDFInfo
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- CN108754085A CN108754085A CN201810706815.XA CN201810706815A CN108754085A CN 108754085 A CN108754085 A CN 108754085A CN 201810706815 A CN201810706815 A CN 201810706815A CN 108754085 A CN108754085 A CN 108754085A
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- Prior art keywords
- salt
- heating
- gcr15
- bainite
- thin
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- 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
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
Abstract
The present invention relates to a kind of GCr15 small steels thin-wall bearing ferrule Bainitic hardening processes, include the following steps：1）GCr15 small steel thin-wall bearing ferrules are placed in charging tray, into bainite production line.2）Heating；3）Salt bath quenching；4）Austempering；The bainite production line is the 750mm horse shellfish production lines of Ai Xie woodss company manufacture；Salt agitating device is provided in the salt-bath quenching tank；Salt used is weight proportion 1 in the salt-bath quenching tank, bainite salt bath isothermobath:The mixed nitrate of 1 sodium nitrite and potassium nitrate composition.The beneficial effects of the invention are as follows：It is that 50 ~ 80mmGCr15 small steels thin-wall bearing ferrule carries out Bainitic hardening processing in bainite production line that can make outer diameter, and deformation rate of the workpiece after austempering is made to be reduced to 2% ~ 3% by original 30%.
Description
Technical field
The present invention relates to bearing heat treatment technics, specifically a kind of GCr15 small steels thin-wall bearing ferrule Bainitic hardening
Process.
Background technology
It is large-scale（Outer diameter is 200mm ~ 400mm）The heat treatment process of GCr15 steel ring Bainitic hardenings processing is
Through maturation, heating temperature is 870 ± 5 DEG C, and 235 ± 5 DEG C of isothermal temperature, the equipment used manufactures for Ai Xie woodss company
750mm roller-bottom type horse shellfish heat-treatment production lines, heating furnace Quench heating technological temperature are 850 ± 5 DEG C of one area of heating, heat 2nd area
~ tetra- 870 ± 5 DEG C of area's temperature, rear air lock are 870 ± 5 DEG C, and four areas Zhong Ge only have an area to play pre- heat effect.Currently, thin-walled is small-sized
(outer diameter is 50 ~ 80mm) GCr15 steel bearings lassos need to carry out bainite processing with same equipment, due to such production
The characteristics of this body structure of product, cannot use technique same as large-scale GCr15 steel rings, otherwise yielding cracking.Therefore, it needs
Change existing heat treatment process, such product can be made to be processed in bainite production line, and meets user's technology and want
It asks.
Invention content
The purpose of the present invention is to propose to a kind of GCr15 small steels (outer diameter is 50 ~ 80mm) thin-wall bearing ferrule bayesian
Body quenching process can make such product carry out Bainitic hardening processing in bainite production line, and meet user's technology
It is required that.
The present invention uses following technical scheme：A kind of GCr15 small steels thin-wall bearing ferrule Bainitic hardening process,
Include the following steps：
1）GCr15 small steel thin-wall bearing ferrules are placed in charging tray, into bainite production line.
2）Heating：In bainite production line, workpiece heats 18 minutes in one area of Quench heating of heating furnace, and technological temperature is
800±5℃；It is heated 18 minutes heating 2nd area, technological temperature is 840 ± 5 DEG C；Respectively add successively heating 3rd area, 4th area of heating
Heat 18 minutes, technological temperature is 870 ± 5 DEG C；Air lock technological temperature is 870 ± 5 DEG C afterwards.
3）Salt bath quenching：The workpiece heated goes out after quenching heating furnace, charging tray be transferred to quenching lifting platform on, charging tray with
Lifting platform drops to salt-bath quenching tank salt bath liquid level hereinafter, carrying out the cooling of upper and lower vertical play, 3 ~ 4 minutes play time, salt
Bath temperature is 180 ± 5 DEG C, and after play, workpiece is raised on salt bath liquid level with lifting platform and completes cooling procedure；
4）Austempering：The workpiece after heating quenching will be carried out, has been transferred in bainite salt bath isothermobath and carries out shellfish
Family name's body isothermal transformation, isothermal hardening salt temperature are 235 ± 5 DEG C, and isothermal time is 3.5 ~ 4 hours.
The bainite production line is the 750mm horse shellfish production lines of Ai Xie woodss company manufacture.
Salt agitating device is provided in the salt-bath quenching tank, the moment speed of agitator that workpiece enters salt is no more than
100rmp, subsequent cooling stage rotating speed are no more than 50rmp；The speed for entering salt moment when play is 80 ~ 120 mm/s, quenching
Channeling move speed is 50 ~ 100 mm/s.
Salt used is weight proportion 1 in the salt-bath quenching tank, bainite salt bath isothermobath:1 sodium nitrite and
The mixed nitrate of potassium nitrate composition.
The beneficial effects of the invention are as follows：Process through the invention can reduce the thermal stress of heating process generation, lead to
Control heating speed is crossed, the structural stress caused by heating causes structural transformation uneven soon can be reduced, reduce the distortion of appearance
Degree makes deformation rate of the workpiece after austempering be reduced to 2% ~ 3% by original 30%.
Specific implementation mode
With reference to specific embodiment, the present invention is further illustrated.
Embodiment 1：
A kind of thin-walled small size bearing lasso 33008X2-2RS/01, taper roll bearing, material：68 mm high of GCr15, outer diameter φ
Spend 21 mm, 4.0 mm of effective thickness, it is desirable that carry out Bainitic hardening, 58 ~ 62HRC of heat treatment hardness, Deformation control is in 0.10mm
Within, deformation exceeding standard rate is no more than 5%；Quantity is 1000.
Its processing step is as follows：
1）GCr15 small steel thin-wall bearing ferrules are placed in charging tray, into bainite production line.
2）Heating：In bainite production line, workpiece heats 18 minutes in one area of Quench heating of heating furnace, and technological temperature is
800℃；It is heated 18 minutes heating 2nd area, technological temperature is 840 DEG C；Heating respectively 18 points of the heating successively of 3rd area, 4th area of heating
Clock, technological temperature are 870 DEG C；Air lock technological temperature is 870 DEG C afterwards.
3）Salt bath quenching：The workpiece heated goes out after quenching heating furnace, charging tray be transferred to quenching lifting platform on, charging tray with
Lifting platform drops to salt-bath quenching tank salt bath liquid level hereinafter, carrying out the cooling of upper and lower vertical play, 3 minutes play time, salt bath
Temperature is 180 DEG C, and after play, workpiece is raised on salt bath liquid level with lifting platform and completes cooling procedure；
4）Austempering：The workpiece after heating quenching will be carried out, has been transferred in bainite salt bath isothermobath and carries out shellfish
Family name's body isothermal transformation, isothermal hardening salt temperature are 235 DEG C, and isothermal time is 3.5 hours.
The bainite production line is the 750mm horse shellfish production lines of Ai Xie woodss company manufacture.
Salt agitating device is equipped in the salt-bath quenching tank, the moment speed of agitator that workpiece enters salt is 50rmp, subsequent
Cooling stage rotating speed is set as 20rmp；The speed for entering salt moment when play is 100 mm/s, and quenching channeling move speed is 50
mm/s。
Salt used is weight proportion 1 in the salt-bath quenching tank, bainite salt bath isothermobath:1 sodium nitrite and
The mixed nitrate of potassium nitrate composition.
Through examining, the hardness of lasso is 59.2 ~ 60HRC after isothermal hardening, and exceeded lasso deflection is 30, and deformation is most
Small is 0.04mm, is up to 0.12mm.Wherein 0.04 ~ 0.08 mm's of deformation accounts for 92%, and 0.08 ~ 0.10 mm's of deflection accounts for 5%,
0.10 ~ 0.12 mm's of deflection accounts for 3%, meets technological requirement.
Embodiment 2：
A kind of thin-walled small size bearing lasso 33008X2-2RS/01, taper roll bearing, material：68 mm high of GCr15, outer diameter φ
Spend 21 mm, 4.0 mm of effective thickness, it is desirable that carry out Bainitic hardening, 58 ~ 62HRC of heat treatment hardness, Deformation control is in 0.10mm
Within, deformation exceeding standard rate is no more than 5%；Quantity is 1000.
Its processing step is as follows：
1）GCr15 small steel thin-wall bearing ferrules are placed in charging tray, into bainite production line.
2）Heating：In bainite production line, workpiece heats 18 minutes in one area of Quench heating of heating furnace, and technological temperature is
800℃；It is heated 18 minutes heating 2nd area, technological temperature is 840 DEG C；Heating respectively 18 points of the heating successively of 3rd area, 4th area of heating
Clock, technological temperature are 875 DEG C；Air lock technological temperature is 875 DEG C afterwards.
3）Salt bath quenching：The workpiece heated goes out after quenching heating furnace, charging tray be transferred to quenching lifting platform on, charging tray with
Lifting platform drops to salt-bath quenching tank salt bath liquid level hereinafter, carrying out the cooling of upper and lower vertical play, 4 minutes play time, salt bath
Temperature is 180 DEG C, and after play, workpiece is raised on salt bath liquid level with lifting platform and completes cooling procedure；
4）Austempering：The workpiece after heating quenching will be carried out, has been transferred in bainite salt bath isothermobath and carries out shellfish
Family name's body isothermal transformation, isothermal hardening salt temperature are 235 DEG C, and isothermal time is 4 hours.
The bainite production line is the 750mm horse shellfish production lines of Ai Xie woodss company manufacture.
Salt agitating device is equipped in the salt-bath quenching tank, the moment speed of agitator that workpiece enters salt is 50rmp, subsequent
Cooling stage rotating speed is set as 50rmp；The speed for entering salt moment when play is 80 mm/s, and quenching channeling move speed is 80mm/
s。
Salt used is weight proportion 1 in the bainite salt bath isothermobath:1 sodium nitrite and potassium nitrate composition mixes
Close nitrate.
Through examining, the hardness of lasso is 59 ~ 59.8HRC after isothermal hardening, and exceeded lasso deflection is 26, and deformation is most
Small is 0.02mm, is up to 0.15mm, wherein 0.02 ~ 0.08 mm's of lasso deflection accounts for 93.4%, deflection 0.08 ~ 0.10
Mm's accounts for 4%, and 0.10 ~ 0.15 mm's of deflection accounts for 2.6%, meets technological requirement.
Embodiment 3：
A kind of thin-walled small size bearing lasso 33008X2-2RS/01, taper roll bearing, material：68 mm high of GCr15, outer diameter φ
Spend 21 mm, 4.0 mm of effective thickness, it is desirable that carry out Bainitic hardening, 58 ~ 62HRC of heat treatment hardness, Deformation control is in 0.10mm
Within, deformation exceeding standard rate is no more than 5%；Quantity is 1000.
Its processing step is as follows：
1）GCr15 small steel thin-wall bearing ferrules are placed in charging tray, into bainite production line.
2）Heating：In bainite production line, workpiece heats 18 minutes in one area of Quench heating of heating furnace, and technological temperature is
800℃；It is heated 18 minutes heating 2nd area, technological temperature is 840 DEG C；Heating respectively 18 points of the heating successively of 3rd area, 4th area of heating
Clock, technological temperature are 875 DEG C；Air lock technological temperature is 875 DEG C afterwards.
3）Salt bath quenching：The workpiece heated goes out after quenching heating furnace, charging tray be transferred to quenching lifting platform on, charging tray with
Lifting platform drops to salt-bath quenching tank salt bath liquid level hereinafter, carrying out the cooling of upper and lower vertical play, 3.5 minutes play time, salt
Bath temperature is 175 DEG C, and after play, workpiece is raised on salt bath liquid level with lifting platform and completes cooling procedure；
4）Austempering：The workpiece after heating quenching will be carried out, has been transferred in bainite salt bath isothermobath and carries out shellfish
Family name's body isothermal transformation, isothermal hardening salt temperature are 238 DEG C, and isothermal time is 3.5 hours.
The bainite production line is the 750mm horse shellfish production lines of Ai Xie woodss company manufacture.
Salt agitating device is equipped in the salt-bath quenching tank, the moment speed of agitator that workpiece enters salt is 80rmp, subsequent
Cooling stage rotating speed is set as 30rmp；The speed for entering salt moment when play is 100 mm/s, and quenching channeling move speed is 50mm/
s。
Salt used is weight proportion 1 in the bainite salt bath isothermobath:1 sodium nitrite and potassium nitrate composition mixes
Close nitrate.
Through examining, the hardness of lasso is 59.5 ~ 60.3HRC after isothermal hardening, and exceeded lasso deflection is 20, deformation
Minimum 0.06mm is up to 0.17mm, and wherein 0.02 ~ 0.08 mm's of lasso deflection accounts for 95%, deflection 0.08 ~ 0.10
Mm's accounts for 3%, and 0.10 ~ 0.15 mm's of deflection accounts for 2%, meets technological requirement.
Part not in the detailed description of the invention is the prior art.
Claims (4)
1. a kind of GCr15 small steels thin-wall bearing ferrule Bainitic hardening process, it is characterized in that：Include the following steps：
1）GCr15 small steel thin-wall bearing ferrules are placed in charging tray, into bainite production line.
2）Heating：In bainite production line, workpiece heats 18 minutes in one area of Quench heating of heating furnace, technological temperature 800
±5℃；It is heated 18 minutes heating 2nd area, technological temperature is 840 ± 5 DEG C；18 are respectively heated successively heating 3rd area, heating 4th area
Minute, technological temperature is 870 ± 5 DEG C；Air lock technological temperature is 870 ± 5 DEG C afterwards.
3）Salt bath quenching：The workpiece heated goes out after quenching heating furnace, and charging tray is transferred on quenching lifting platform, and charging tray is with lifting
Platform drops to salt-bath quenching tank salt bath liquid level hereinafter, carrying out the cooling of upper and lower vertical play, 3 ~ 4 minutes play time, salt bath temperature
Degree is 180 ± 5 DEG C, and after play, workpiece is raised on salt bath liquid level with lifting platform and completes cooling procedure.
4）Austempering：The workpiece after heating quenching will be carried out, has been transferred in bainite salt bath isothermobath and carries out shellfish
Family name's body isothermal transformation, isothermal hardening salt temperature are 235 ± 5 DEG C, and isothermal time is 3.5 ~ 4 hours.
2. a kind of GCr15 small steels thin-wall bearing ferrule Bainitic hardening process according to claim 1, feature
It is：The bainite production line is the 750mm horse shellfish production lines of Ai Xie woodss company manufacture.
3. a kind of GCr15 small steels thin-wall bearing ferrule Bainitic hardening process according to claim 1, feature
It is：Salt agitating device is provided in the salt-bath quenching tank, the moment speed of agitator that workpiece enters salt is no more than 100rmp, then
Cooling stage rotating speed be no more than 50rmp；The speed for entering salt moment when play is 80 ~ 120 mm/s, and quenching channeling move speed is
50~100 mm/s。
4. a kind of GCr15 small steels thin-wall bearing ferrule Bainitic hardening process according to claim 1, feature
It is：Salt used is weight proportion 1 in the salt-bath quenching tank, bainite salt bath isothermobath:1 sodium nitrite and potassium nitrate
The mixed nitrate of composition.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810706815.XA CN108754085A (en) | 2018-07-02 | 2018-07-02 | A kind of GCr15 small steels thin-wall bearing ferrule Bainitic hardening process |
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| CN201810706815.XA CN108754085A (en) | 2018-07-02 | 2018-07-02 | A kind of GCr15 small steels thin-wall bearing ferrule Bainitic hardening process |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109402336A (en) * | 2018-12-26 | 2019-03-01 | 河南理工大学 | The Bainitic hardening technique of steel measuring tape band |
| CN110527817A (en) * | 2019-08-19 | 2019-12-03 | 西北矿冶研究院 | Heat treatment method for hot-setting tooth bit body |
| CN111154953A (en) * | 2020-02-21 | 2020-05-15 | 沈阳工业大学 | Heat treatment method for improving comprehensive mechanical property of GCr15 steel |
| CN111690868A (en) * | 2020-05-19 | 2020-09-22 | 赵纪明 | Isothermal quenching vermicular graphite cast iron and preparation method thereof |
| CN114480797A (en) * | 2022-01-27 | 2022-05-13 | 石狮市汇星机械有限公司 | Heat treatment process method for producing knitting machine cam by using GCr15 steel |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109402336A (en) * | 2018-12-26 | 2019-03-01 | 河南理工大学 | The Bainitic hardening technique of steel measuring tape band |
| CN110527817A (en) * | 2019-08-19 | 2019-12-03 | 西北矿冶研究院 | Heat treatment method for hot-setting tooth bit body |
| CN110527817B (en) * | 2019-08-19 | 2021-07-13 | 西北矿冶研究院 | Heat treatment method for hot-setting tooth bit body |
| CN111154953A (en) * | 2020-02-21 | 2020-05-15 | 沈阳工业大学 | Heat treatment method for improving comprehensive mechanical property of GCr15 steel |
| CN111154953B (en) * | 2020-02-21 | 2021-10-12 | 沈阳工业大学 | Heat treatment method for improving comprehensive mechanical property of GCr15 steel |
| CN111690868A (en) * | 2020-05-19 | 2020-09-22 | 赵纪明 | Isothermal quenching vermicular graphite cast iron and preparation method thereof |
| CN114480797A (en) * | 2022-01-27 | 2022-05-13 | 石狮市汇星机械有限公司 | Heat treatment process method for producing knitting machine cam by using GCr15 steel |
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Application publication date: 20181106 |