CN108866312A - A kind of bearing heat treatment process - Google Patents
A kind of bearing heat treatment process Download PDFInfo
- Publication number
- CN108866312A CN108866312A CN201810851237.9A CN201810851237A CN108866312A CN 108866312 A CN108866312 A CN 108866312A CN 201810851237 A CN201810851237 A CN 201810851237A CN 108866312 A CN108866312 A CN 108866312A
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- Prior art keywords
- bearing
- quenching
- temperature
- cooled
- minutes
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Classifications
-
- 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
-
- 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
- C21D1/32—Soft annealing, e.g. spheroidising
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Rolling Contact Bearings (AREA)
Abstract
A kind of bearing heat treatment process, is related to technical field of bearing processing comprising following steps：（1）Spheroidizing：Bearing heating to 750-770 DEG C, 1 ~ 3 hour is kept the temperature, is then cooled down with the cooling rate of 20-40 DEG C/h, is cooled to 600 DEG C hereinafter, coming out of the stove air-cooled；（2）Quenching：First 580-620 DEG C is risen to the heating rate of 10-15 DEG C/h, and preheated 37-43 minutes at a temperature of 580-620 DEG C, then 830-850 DEG C of progress quenching and preserving heat is risen to the heating rate of 8-12 DEG C/h, the time of quenching and preserving heat is 87-93 minutes, then oily cold, Oil-temperature control is at 60-80 DEG C；（3）Tempering：Low temperature oil-temper is carried out to bearing, 170-190 DEG C is risen to the heating rate of 10-15 DEG C/h, keeps the temperature 60-90 minutes；（4）Cold treatment：100 DEG C are cooled to the furnace hereinafter, then coming out of the stove natural cooling 60-120 minutes.The machining accuracy, impact flexibility and fatigue life of bearing can be improved in the present invention.
Description
Technical field
The present invention relates to technical field of bearing processing, a kind of especially bearing heat treatment process.
Background technique
Bearing is a kind of important spare part in contemporary mechanical equipment.Its major function is to support mechanical rotary body, is reduced
Coefficient of friction in its motion process, and guarantee its rotating accuracy.According to the difference of the friction properties of the moving elements, bearing can be divided into rolling
Dynamic bearing and sliding bearing two major classes.Wherein rolling bearing is normalized, seriation, but its radial direction compared with sliding bearing
Size, vibration and noise are larger, and price is also higher.Rolling bearing is generally by outer ring, four part group of inner ring, rolling element and retainer
At being strictly speaking made of outer ring, inner ring, rolling element, retainer, sealing, the big part of lubricating oil six.In simple terms, as long as tool
Standby outer ring, inner ring, rolling element just may be defined as rolling bearing.By the shape of rolling element, rolling bearing is divided into ball bearing and roller
Bearing two major classes.
Currently, very big radial deformation and end face buckling deformation can occur in quenching process for bearing, both deformations are such as
Fruit cannot be well solved, and directly influence the geometric tolerance of product mill processing, cause more waste product substandard products.It wants simultaneously
Ask it that must have the ball-bearing steel of high intensity, high elastic limit and high wearability and forging rolling state, interior tissue
For lamellar pearlite and network cementite.This tissue hardness is higher, and machining is relatively difficult, is also easy mill to cutting tool
Damage.Simultaneously because the presence of network cementite, causes steel internal component uneven, in this way, will cause biggish group in quenching
Stress is knitted, deformation or the cracking of part are easily caused.In order to improve this tissue, except using normalized treatment elimination network cementite
It outside, is then required using spheroidizing.But traditional conventional annealing process period length, big energy-consuming, low efficiency, and
Carbide size distribution is uneven, to influence its application.
Summary of the invention
The purpose of the present invention is to solve the above-mentioned problems of the prior art, provide a kind of bearing heat treatment process,
The machining accuracy, impact flexibility and fatigue life of bearing can be improved.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme that：A kind of bearing heat treatment process, including with
Lower step：
（1）Spheroidizing：Bearing heating to 750-770 DEG C, keep the temperature 1 ~ 3 hour, then with the cooling rate of 20-40 DEG C/h into
Row cooling, is cooled to 600 DEG C hereinafter, coming out of the stove air-cooled；
（2）Quenching：580-620 DEG C first is risen to the heating rate of 10-15 DEG C/h, and preheats 37-43 at a temperature of 580-620 DEG C
Minute, then 830-850 DEG C of progress quenching and preserving heat is risen to the heating rate of 8-12 DEG C/h, the time of quenching and preserving heat is 87-93 points
Clock, then oily cold, Oil-temperature control is at 60-80 DEG C；
（3）Tempering：Low temperature oil-temper is carried out to bearing, 170-190 DEG C is risen to the heating rate of 10-15 DEG C/h, keeps the temperature 60-90
Minute；
（4）Cold treatment：100 DEG C are cooled to the furnace hereinafter, then coming out of the stove natural cooling 60-120 minutes.
Preferably, vacuum quencher is used when quenching.
It is highly preferred that the machinery oil that cooling medium when furnace cooling in cold-treating process is 30 ~ 50 DEG C.
The beneficial effects of the present invention are：Pass through step（1）Spheroidizing, casting, forging and weldment can be reduced or eliminated
The structural heterogenity of internal stress and chemical component can improve and adjust the mechanical performance and processing performance of steel, so as to for after
Continuous rotary cut manufacturing procedure is got ready；Pass through step（2）Middle first heating preheating is quenched again, and strict control heating speed
It spends, slowly heats up, can avoid reducing quenching distortion because of deformation caused by heating unevenly, improving the stability of size, drop simultaneously
Low subsequent correction rate improves production efficiency, to reach machining accuracy, impact flexibility and the mesh of fatigue life for improving bearing
's.
Specific embodiment
Embodiment 1
A kind of bearing heat treatment process, includes the following steps：
（1）Spheroidizing：Bearing heating to 750 DEG C, 1 hour is kept the temperature, is then cooled down with the cooling rate of 20 DEG C/h, it is cold
But to 600 DEG C hereinafter, coming out of the stove air-cooled；
（2）Quenching：580 DEG C first are risen to the heating rate of 10 DEG C/h, and is preheated 37 minutes at a temperature of 580 DEG C, then with 8 DEG C/h
Heating rate rise to 830 DEG C of progress quenching and preserving heats, the time of quenching and preserving heat is 87 minutes, and then oily cold, Oil-temperature control is 60
℃；
（3）Tempering：Low temperature oil-temper is carried out to bearing, 170 DEG C is risen to the heating rate of 10 DEG C/h, keeps the temperature 60 minutes；
（4）Cold treatment：100 DEG C are cooled to the furnace hereinafter, then coming out of the stove natural cooling 60 minutes.
Preferably, vacuum quencher is used when quenching.
More preferably, the machinery oil that cooling medium when furnace cooling in cold-treating process is 30 DEG C.
Embodiment 2
A kind of bearing heat treatment process, includes the following steps：
（1）Spheroidizing：Bearing heatings to 760 DEG C, 1.5 hours are kept the temperature, is then cooled down with the cooling rate of 30 DEG C/h,
600 DEG C are cooled to hereinafter, coming out of the stove air-cooled；
（2）Quenching：First with the heating rate of 12 DEG C/h rise to 600 DEG C, and preheated 40 minutes at a temperature of 600 DEG C, then with 10 DEG C/
The heating rate of h rises to 840 DEG C of progress quenching and preserving heats, and the time of quenching and preserving heat is 90 minutes, and then oily cold, Oil-temperature control is 70
℃；
（3）Tempering：Low temperature oil-temper is carried out to bearing, 180 DEG C is risen to the heating rate of 12 DEG C/h, keeps the temperature 75 minutes；
（4）Cold treatment：100 DEG C are cooled to the furnace hereinafter, then coming out of the stove natural cooling 80 minutes.
Preferably, vacuum quencher is used when quenching.
More preferably, the machinery oil that cooling medium when furnace cooling in cold-treating process is 40 DEG C.
Embodiment 3
A kind of bearing heat treatment process, includes the following steps：
（1）Spheroidizing：Bearing heating to 770 DEG C, 3 hours are kept the temperature, is then cooled down with the cooling rate of 40 DEG C/h, it is cold
But to 600 DEG C hereinafter, coming out of the stove air-cooled；
（2）Quenching：First with the heating rate of 15 DEG C/h rise to 620 DEG C, and preheated 43 minutes at a temperature of 620 DEG C, then with 12 DEG C/
The heating rate of h rises to 850 DEG C of progress quenching and preserving heats, and the time of quenching and preserving heat is 93 minutes, and then oily cold, Oil-temperature control is 80
℃；
（3）Tempering：Low temperature oil-temper is carried out to bearing, 190 DEG C is risen to the heating rate of 15 DEG C/h, keeps the temperature 90 minutes；
（4）Cold treatment：100 DEG C are cooled to the furnace hereinafter, then coming out of the stove natural cooling 120 minutes.
Preferably, vacuum quencher is used when quenching.
More preferably, the machinery oil that cooling medium when furnace cooling in cold-treating process is 50 DEG C.
Above-described embodiment is the preferable implementation of the present invention, and in addition to this, the present invention can be realized with other way,
Do not depart from the technical program design under the premise of it is any obviously replace it is within the scope of the present invention.
Claims (3)
1. a kind of bearing heat treatment process, which is characterized in that include the following steps：
（1）Spheroidizing：Bearing heating to 750-770 DEG C, keep the temperature 1 ~ 3 hour, then with the cooling rate of 20-40 DEG C/h into
Row cooling, is cooled to 600 DEG C hereinafter, coming out of the stove air-cooled；
（2）Quenching：580-620 DEG C first is risen to the heating rate of 10-15 DEG C/h, and preheats 37-43 at a temperature of 580-620 DEG C
Minute, then 830-850 DEG C of progress quenching and preserving heat is risen to the heating rate of 8-12 DEG C/h, the time of quenching and preserving heat is 87-93 points
Clock, then oily cold, Oil-temperature control is at 60-80 DEG C；
（3）Tempering：Low temperature oil-temper is carried out to bearing, 170-190 DEG C is risen to the heating rate of 10-15 DEG C/h, keeps the temperature 60-90
Minute；
（4）Cold treatment：100 DEG C are cooled to the furnace hereinafter, then coming out of the stove natural cooling 60-120 minutes.
2. bearing heat treatment process according to claim 1, it is characterised in that：Vacuum quencher is used when quenching.
3. bearing heat treatment process according to claim 2, it is characterised in that：When furnace cooling in cold-treating process
The machinery oil that cooling medium is 30 ~ 50 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810851237.9A CN108866312A (en) | 2018-07-30 | 2018-07-30 | A kind of bearing heat treatment process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810851237.9A CN108866312A (en) | 2018-07-30 | 2018-07-30 | A kind of bearing heat treatment process |
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| Publication Number | Publication Date |
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| CN108866312A true CN108866312A (en) | 2018-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810851237.9A Pending CN108866312A (en) | 2018-07-30 | 2018-07-30 | A kind of bearing heat treatment process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110923420A (en) * | 2019-12-17 | 2020-03-27 | 常熟市恒丰机械制造有限公司 | Production process of yarn guide |
| CN111876564A (en) * | 2020-07-14 | 2020-11-03 | 昆山正通铭金属有限公司 | Spheroidizing annealing process of hexagonal alloy tool steel S2 |
| CN112756919A (en) * | 2020-12-31 | 2021-05-07 | 沈阳鼓风机集团齿轮压缩机有限公司 | Machining method of compressor ball bearing |
-
2018
- 2018-07-30 CN CN201810851237.9A patent/CN108866312A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110923420A (en) * | 2019-12-17 | 2020-03-27 | 常熟市恒丰机械制造有限公司 | Production process of yarn guide |
| CN111876564A (en) * | 2020-07-14 | 2020-11-03 | 昆山正通铭金属有限公司 | Spheroidizing annealing process of hexagonal alloy tool steel S2 |
| CN111876564B (en) * | 2020-07-14 | 2022-03-04 | 昆山正通铭金属有限公司 | Spheroidizing annealing process of hexagonal alloy tool steel S2 |
| CN112756919A (en) * | 2020-12-31 | 2021-05-07 | 沈阳鼓风机集团齿轮压缩机有限公司 | Machining method of compressor ball bearing |
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Application publication date: 20181123 |
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