CN107385157A - A kind of bearing calcines quenching technical - Google Patents
A kind of bearing calcines quenching technical Download PDFInfo
- Publication number
- CN107385157A CN107385157A CN201710474455.0A CN201710474455A CN107385157A CN 107385157 A CN107385157 A CN 107385157A CN 201710474455 A CN201710474455 A CN 201710474455A CN 107385157 A CN107385157 A CN 107385157A
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- CN
- China
- Prior art keywords
- bearing
- temperature
- quenching
- calcining
- heated
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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
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
-
- 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
Abstract
It is an object of the invention to provide a kind of bearing to calcine quenching technical, and the quenching technical step of its bearing is：(1) temperature ramp-up rate when pre-add heat treatment before forging, carrying out low temperature before bearing is forged and be pre-heated to 870-900 DEG C, and being heated to bearing base is 50-60 DEG C/h；(2) high-temperature calcination is handled, the bearing obtained in step 1 progress secondary high-temperature is heated to 1050-1100 DEG C, 30-35min of calcining at constant temperature is carried out when bearing temperature is raised to preset temperature, (3) Bearing Quenching cooling processing, bearing after high-temperature calcination is taken out and carries out second order quenching processing, (4) it is the bearing in step 3 is air-cooled to melting down carry out temper at 170-180 DEG C at this moment, reduce the transformation of Bearing inner structural stress, prevent in quenching because internal and external temperature has big difference, bearing surface is avoided to be broken, improve the quality of Bearing Quenching.
Description
Technical field
The present invention relates to the processing aspect that the field in terms of the processing technology of bearing, the particularly calcining to bearing quench
Improvement, more particularly to a kind of bearing calcining quenching technical.
Background technology
With the raising of industrial level, use of the people for bearing is particularly extensive, when especially current bearing uses
The stress being subject to is increasing, therefore of a relatively high to the Surface Machining processing requirement of bearing, and this is just needed to bearing calcining table
Face carries out Quenching Treatment, to increase bearing surface hardness, but when being quenched to bearing surface in the past, due in quenching
Surface temperature declines comparatively fast, causes inside and outside temperature difference excessive, external carbuncle in generation, causes bearing surface to be broken, and reduces bearing and quenches
Fiery qualification rate, efficiency of dispatching from the factory is reduced, adds production cost.
Therefore it provides a kind of bearing calcining quenching technical, to be improved by the quenching technical of bearing, is used
Cold water quenches and the quenching of air-cooled second order quenches to bearing, reduces the transformation of Bearing inner structural stress, prevents in quenching
Because internal and external temperature has big difference, avoid bearing surface from being broken, improve the quality of Bearing Quenching, while to cold water quenching
The aqueous solution is improved, the speed of reduction quenching cooling, stress difference inside and outside reduction, improves Bearing Quenching qualification rate, raising is dispatched from the factory
Efficiency, with regard to the problem of turning into those skilled in the art's urgent need to resolve.
The content of the invention
It is an object of the invention to provide a kind of bearing to calcine quenching technical, to be carried out by the quenching technical of bearing
Improve, bearing is quenched using cold water quenching and the quenching of air-cooled second order, the transformation of Bearing inner structural stress is reduced, prevents
In quenching because internal and external temperature has big difference, avoid bearing surface from being broken, improve the quality of Bearing Quenching, while to cold
The aqueous solution of water quenching is improved, the speed of reduction quenching cooling, stress difference inside and outside reduction, improves Bearing Quenching qualification rate,
Raising is dispatched from the factory efficiency.
To solve technical problem described in background technology, the present invention uses following technical scheme：
A kind of bearing calcines quenching technical, and the quenching technical step of its bearing is：
(1) pre-add heat treatment before forging, carry out low temperature before bearing is forged and be pre-heated to 870-900 DEG C, and bearing base is added
Temperature ramp-up rate when hot is 50-60 DEG C/h；
(2) high-temperature calcination is handled, and the bearing obtained in step 1 progress secondary high-temperature is heated into 1050-1100 DEG C, when
Bearing temperature carries out 30-35min of calcining at constant temperature when being raised to preset temperature, then takes out；
(3) Bearing Quenching cooling processing, the bearing after high-temperature calcination is taken out and carries out second order quenching processing, first by high temperature
Bearing surface spraying cold water carry out cold water cooling, when bearing temperature is reduced to 260-280 degrees Celsius stop water spray, then
Be placed into air carry out it is air-cooled；
(4) it is the bearing in step 3 is air-cooled to melting down carry out temper at 170-180 DEG C at this moment.
Preferably, vacuum state is set in calcining furnace when being calcined in described step 2, by will be set in calcining furnace
Vacuum state, it can prevent that with air oxidation reaction occurs for bearing in high-temperature calcination, influence to eat the smooth degree of bearing surface
And hardness.
Preferably, bearing remains a constant speed rotary state when carrying out cold water quenching to bearing in described step 3, and bearing turns
Dynamic speed is 100-120rad/min, and cold water water spraying time is 25s, is carried out ceaselessly when carrying out cold water quenching to bearing
It is rapid to rotate, it is possible to increase the uniformity of quenching.
Preferably, temperature when being tempered in described step 4 to bearing is 270 degree, and the time of tempering is
110-120s, by carrying out temper to bearing, center portion temperature also will not be too high, and the heat that surface is reached from center portion will not
A lot, the rise that bearing surface temperature will not be caused more makes surface temper and influences case hardness.
Preferably, cold water uses 4-8% PAG aqueous solution to be quenched when described step 3 is quenched, energy
The enough aqueous solution to cold water quenching is improved, the speed of reduction quenching cooling, stress difference inside and outside reduction, avoids bearing surface from going out
Now it is broken.
The beneficial effects of the invention are as follows：
It is improved by the quenching technical of bearing, bearing is quenched using cold water quenching and the quenching of air-cooled second order,
The transformation of Bearing inner structural stress is reduced, prevents from avoiding bearing surface from occurring because internal and external temperature has big difference in quenching
Fracture, the quality of Bearing Quenching is improved, while the aqueous solution of cold water quenching is improved, reduced the speed of quenching cooling, subtract
Few inside and outside stress difference, improves Bearing Quenching qualification rate, improves efficiency of dispatching from the factory.
Embodiment
In order that those skilled in the art more fully understands technical scheme, the present invention will be made into one below
Step is discussed in detail.
A kind of bearing calcines quenching technical, and the quenching technical step of its bearing is：
(1) when pre-add heat treatment before forging, carrying out low temperature before bearing is forged and be pre-heated to 870 DEG C, and bearing base being heated
Temperature ramp-up rate be 60 DEG C/h；
(2) high-temperature calcination is handled, and the bearing obtained in step 1 progress secondary high-temperature is heated into 1050 DEG C, when bearing temperature
Degree carries out calcining at constant temperature 30min when being raised to preset temperature, then takes out；
(3) Bearing Quenching cooling processing, the bearing after high-temperature calcination is taken out and carries out second order quenching processing, first by high temperature
Bearing surface spraying cold water carry out cold water cooling, when bearing temperature is reduced to 260 degrees Celsius stop water spray, be then placed into
Carried out in air air-cooled；
(4) by the bearing in step 3 it is air-cooled to 170 DEG C when melt down carry out temper at this moment.
Further, vacuum state is set in calcining furnace when being calcined in described step 2, by will be set in calcining furnace
For vacuum state, it can prevent that with air oxidation reaction occurs for bearing in high-temperature calcination, influence to eat the smooth journey of bearing surface
Degree and hardness.
Further, bearing remains a constant speed rotary state when carrying out cold water quenching to bearing in described step 3, bearing
Velocity of rotation is 100rad/min, and cold water water spraying time is 25s, is carried out when carrying out cold water quenching to bearing ceaselessly rapid
Rotate, it is possible to increase the uniformity of quenching.
Further, temperature when being tempered in described step 4 to bearing is 270 degree, and the time of tempering is
110s, by carrying out temper to bearing, center portion temperature also will not be too high, and the heat that surface is reached from center portion will not be a lot,
The rise that bearing surface temperature will not be caused more makes surface temper and influences case hardness.
Further, cold water uses the 4% PAG aqueous solution to be quenched when described step 3 is quenched, can
The aqueous solution of cold water quenching is improved, the speed of reduction quenching cooling, stress difference inside and outside reduction, avoids bearing surface from occurring
Fracture.
Some one exemplary embodiments of the present invention are only described by way of explanation above, undoubtedly, for ability
The those of ordinary skill in domain, without departing from the spirit and scope of the present invention, can be with a variety of modes to institute
The embodiment of description is modified.Therefore, foregoing description is inherently illustrative, and should not be construed as will to right of the present invention
Ask the limitation of protection domain.
Claims (5)
1. a kind of bearing calcines quenching technical, it is characterised in that：The quenching technical step of its bearing is：
(1) when pre-add heat treatment before forging, carrying out low temperature before bearing is forged and be pre-heated to 870-900 DEG C, and bearing base being heated
Temperature ramp-up rate be 50-60 DEG C/h；
(2) high-temperature calcination is handled, and the bearing obtained in step 1 progress secondary high-temperature is heated into 1050-1100 DEG C, works as bearing
Temperature carries out 30-35min of calcining at constant temperature when being raised to preset temperature, then takes out；
(3) Bearing Quenching cooling processing, the bearing after high-temperature calcination is taken out and carries out second order quenching processing, first by the axle of high temperature
Hold surface spraying cold water and carry out cold water cooling, stop water spray when bearing temperature is reduced to 260-280 degrees Celsius, then place
Carried out into air air-cooled；
(4) it is the bearing in step 3 is air-cooled to melting down carry out temper at 170-180 DEG C at this moment.
2. a kind of bearing calcining quenching technical according to claim 1, it is characterised in that forged in described step 2
Vacuum state is set to during burning in calcining furnace.
3. a kind of bearing calcining quenching technical according to claim 1, it is characterised in that to bearing in described step 3
Bearing remains a constant speed rotary state when carrying out cold water quenching, and the velocity of rotation of bearing be 100-120rad/min, and cold water water spray
Time is 25s.
4. a kind of bearing calcining quenching technical according to claim 1, it is characterised in that to bearing in described step 4
Temperature when being tempered is 270 degree, and the time of tempering is 110-120s.
5. a kind of bearing calcining quenching technical according to claim 1, it is characterised in that described step 3 is quenched
Shi Lengshui uses 4-8% PAG aqueous solution to be quenched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710474455.0A CN107385157A (en) | 2017-06-21 | 2017-06-21 | A kind of bearing calcines quenching technical |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710474455.0A CN107385157A (en) | 2017-06-21 | 2017-06-21 | A kind of bearing calcines quenching technical |
Publications (1)
| Publication Number | Publication Date |
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| CN107385157A true CN107385157A (en) | 2017-11-24 |
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| CN201710474455.0A Pending CN107385157A (en) | 2017-06-21 | 2017-06-21 | A kind of bearing calcines quenching technical |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101660025A (en) * | 2009-09-28 | 2010-03-03 | 洛阳Lyc轴承有限公司 | Medium frequency induction hardening process of super large diameter bearing steel castings |
| CN101824516A (en) * | 2009-03-02 | 2010-09-08 | 湖北新火炬科技股份有限公司 | Supersonic frequency quenching process for roller path of hub bearing assembly |
| US20120055587A1 (en) * | 2009-03-19 | 2012-03-08 | Cornelius Petrus Antonius Vissers | Method of manufacturing a bearing ring |
| JP2012246564A (en) * | 2011-05-31 | 2012-12-13 | Sintokogio Ltd | Wear-resistant low-alloy cast steel |
| CN105603329A (en) * | 2016-01-09 | 2016-05-25 | 钢铁研究总院 | High-carbon and high-strength-and-toughness tungsten-molybdenum composite secondary hardening stainless bearing steel and preparation method |
| CN106086631A (en) * | 2016-08-23 | 2016-11-09 | 钢铁研究总院 | High-hardness, wearable height nitrogen martensite stainless bearing steel and preparation method thereof |
-
2017
- 2017-06-21 CN CN201710474455.0A patent/CN107385157A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824516A (en) * | 2009-03-02 | 2010-09-08 | 湖北新火炬科技股份有限公司 | Supersonic frequency quenching process for roller path of hub bearing assembly |
| US20120055587A1 (en) * | 2009-03-19 | 2012-03-08 | Cornelius Petrus Antonius Vissers | Method of manufacturing a bearing ring |
| CN101660025A (en) * | 2009-09-28 | 2010-03-03 | 洛阳Lyc轴承有限公司 | Medium frequency induction hardening process of super large diameter bearing steel castings |
| JP2012246564A (en) * | 2011-05-31 | 2012-12-13 | Sintokogio Ltd | Wear-resistant low-alloy cast steel |
| CN105603329A (en) * | 2016-01-09 | 2016-05-25 | 钢铁研究总院 | High-carbon and high-strength-and-toughness tungsten-molybdenum composite secondary hardening stainless bearing steel and preparation method |
| CN106086631A (en) * | 2016-08-23 | 2016-11-09 | 钢铁研究总院 | High-hardness, wearable height nitrogen martensite stainless bearing steel and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 中国机械工程学会热处理专业分会《热处理手册》编委会 编: "《热处理手册 典型零件热处理》", 31 July 2001, 北京：机械工业出版社 * |
| 樊新民 等: "《热处理工艺与实践》", 31 January 2012, 机械工业出版社 * |
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Application publication date: 20171124 |