CN115717232A - Heat treatment method of bearing retainer - Google Patents
Heat treatment method of bearing retainer Download PDFInfo
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- CN115717232A CN115717232A CN202211461098.1A CN202211461098A CN115717232A CN 115717232 A CN115717232 A CN 115717232A CN 202211461098 A CN202211461098 A CN 202211461098A CN 115717232 A CN115717232 A CN 115717232A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The application discloses a heat treatment method of a bearing retainer, which comprises the following steps: (1) pretreatment: cleaning the workpiece to remove surface oil stains; (2) preheating: heating the workpiece to 300-350 ℃, preserving heat, discharging from the furnace, and performing carbonitriding within 5min; and (3) carbonitriding: putting the preheated workpiece into a furnace, heating to 780-810 ℃, introducing carbon-containing gas and nitrogen-containing gas after the temperature is reached, and preserving the heat; and (4) quenching: immersing the workpiece into quenching oil for quenching; (5) cleaning: cleaning residual quenching oil stains on the surface of the workpiece; (6) tempering: and (4) putting the workpiece into a tempering furnace after cleaning, and cooling in air after discharging. The heat treatment deformation condition of the retainer is obviously improved by preheating and limiting the preheating temperature and the carbonitriding temperature and matching with hot oil cooling quenching, so that the size qualification rate of the retainer is improved to more than 97%.
Description
Technical Field
The application relates to a heat treatment method of a bearing retainer, belonging to the technical field of heat treatment of metal materials.
Background
Carbonitriding is a chemical surface heat treatment process that simultaneously infiltrates carbon and nitrogen into the surface of a steel part. The carbonitriding overcomes the defects that although the hardness of a nitriding layer is high, the nitriding layer is shallow, and the hardening depth of a carburizing layer is large, but the surface hardness is low to a certain extent. At present, in the traditional carbonitriding process, the workpiece is subjected to heat treatment by selecting a methanol, ammonia, propane and other carburizing mediums and providing an atmosphere for the workpiece, carbon and nitrogen are permeated simultaneously in the process, and then the technical requirements of enhancing the strength and the wear resistance of the workpiece and the like are met by means of quenching, tempering and the like.
In the traditional carburizing and quenching process of the CRB bearing retainer, a high-temperature carburizing and rapid quenching cooling mode is adopted, the internal stress is large, the size deformation of the product is large, and the size qualified rate is only about 80%.
Disclosure of Invention
In order to solve the problems, the heat treatment method for the bearing retainer is provided, and the preheating temperature and the carbonitriding temperature are limited by adopting preheating, and then hot oil cooling quenching is matched, so that the internal stress of the retainer is reduced, the heat treatment deformation condition of the CRB retainer is obviously improved, and the dimensional qualification rate of the retainer is improved to more than 97 percent.
According to one aspect of the present application, there is provided a heat treatment method of a bearing holder, comprising the steps of:
(1) Pretreatment: cleaning the workpiece to remove surface oil stains;
(2) Preheating: heating the workpiece to 300-350 ℃, preserving heat, discharging from the furnace, and performing carbonitriding within 5min;
(3) Carbonitriding: putting the preheated workpiece into a furnace, heating to 780-810 ℃, introducing carbon-containing gas and nitrogen-containing gas after the temperature is reached, and preserving the heat;
(4) Quenching: immersing the workpiece into quenching oil for quenching;
(5) Cleaning: cleaning residual quenching oil stains on the surface of the workpiece;
(6) Tempering: and (4) after cleaning, putting the workpiece into a tempering furnace, and after discharging, air cooling.
Optionally, the heat preservation time of the step (2) is 60-90min.
Optionally, in step (3), the carbon-containing gas is methanol, and the nitrogen-containing gas is ammonia.
Optionally, the flow rate of methanol is 40-50mL/min, and the flow rate of ammonia is 2-6L/min.
Optionally, the holding time in step (3) is 50-70min.
Optionally, in the step (4), the quenching oil temperature is 130-140 ℃, the quenching time is 15-30min, and the oil draining is 40-50min.
Optionally, in the step (5), the tempering temperature is 200-250 ℃, and the heat preservation time is 110-130min.
Specifically, after tempering is finished, the furnace is taken out, and air is cooled to room temperature of 25 ℃ to finish the heat treatment process.
Benefits of the present application include, but are not limited to:
1. according to the heat treatment method of the bearing retainer, the preheating temperature and the carbonitriding temperature are limited by adopting preheating, and then the hot oil cooling quenching is matched, so that the heat treatment deformation condition of the CRB retainer is obviously improved, and the dimensional qualification rate of the retainer is improved to more than 97%.
2. According to the heat treatment method of the bearing retainer, the inner temperature and the outer temperature of the retainer are kept consistent by limiting the preheating temperature, so that the stress of the retainer is released, and the deformation of a workpiece in the subsequent heat treatment can be effectively reduced.
3. According to the heat treatment method of the bearing retainer, the internal stress of the retainer is effectively reduced and the deformation is reduced by reducing the temperature of carbonitriding to be in the range of 780-810 ℃.
4. According to the heat treatment method of the bearing retainer, the quenching temperature is limited by carrying out rapid quenching, the cooling speed is reduced, the deformation caused by expansion with heat and contraction with cold is reduced, and the workpiece has good mechanical properties and high qualification rate.
5. According to the heat treatment method of the bearing retainer, the hardness of the workpiece reaches the standard by limiting the tempering temperature and time and utilizing the epsilon phase time effect, and the requirement of product quality is met.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The reagents or starting materials used in the present invention can be purchased from conventional sources, and unless otherwise specified, the reagents or starting materials used in the present invention can be used in a conventional manner in the art or in accordance with the product specifications. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. The preferred methods and materials described in this patent are for illustrative purposes only.
The following examples all take a holder of the CRB 8127 type as an example, and different heat treatment methods are performed.
Example 1 Heat treatment method 1#
The method specifically comprises the following steps:
(1) Pretreatment: cleaning the workpiece to remove oil stains on the surface;
(2) Preheating: heating the workpiece to 320 ℃, preserving heat for 80min, discharging the workpiece out of the furnace, and performing carbonitriding within 5min;
(3) Carbonitriding: putting the preheated workpiece into a furnace, heating to 800 ℃, introducing (flow: 45 mL/min) and ammonia (flow: 3L/min) after reaching the temperature, and preserving the temperature for 60min;
(4) Quenching: immersing the workpiece into quenching oil for quenching, wherein the temperature of the quenching oil is 135 ℃, the quenching time is 20min, and oil draining is 45min;
(5) Cleaning: cleaning residual quenching oil stains on the surface of the workpiece;
(6) Tempering: cleaning, putting the workpiece into a tempering furnace, keeping the temperature for 120min at the tempering temperature of 220 ℃, and cooling in air after discharging.
Example 2 Heat treatment method 2#
The method specifically comprises the following steps:
(1) Pretreatment: cleaning the workpiece to remove oil stains on the surface;
(2) Preheating: heating the workpiece to 300 ℃, preserving heat for 90min, discharging, and performing carbonitriding within 5min;
(3) Carbonitriding: putting the preheated workpiece into a furnace, heating to 780 ℃, introducing (flow: 50 mL/min) and ammonia (flow: 6L/min) after reaching the temperature, and preserving heat for 70min;
(4) Quenching: immersing the workpiece into quenching oil for quenching, wherein the temperature of the quenching oil is 130 ℃, the quenching time is 30min, and oil draining is 50min;
(5) Cleaning: cleaning residual quenching oil stains on the surface of the workpiece;
(6) Tempering: after cleaning, putting the workpiece into a tempering furnace, keeping the temperature for 110min at the tempering temperature of 200 ℃, and cooling in air after discharging.
Example 3 Heat treatment method 3#
The method specifically comprises the following steps:
(1) Pretreatment: cleaning the workpiece to remove oil stains on the surface;
(2) Preheating: heating the workpiece to 350 ℃, preserving heat for 60min, discharging, and performing carbonitriding within 5min;
(3) Carbonitriding: putting the preheated workpiece into a furnace, heating to 810 ℃, introducing (flow: 45 mL/min) and ammonia gas (flow: 2L/min) after reaching the temperature, and keeping the temperature for 50min;
(4) Quenching: immersing the workpiece into quenching oil for quenching, wherein the temperature of the quenching oil is 140 ℃, the quenching time is 15min, and oil draining is 40min;
(5) Cleaning: cleaning residual quenching oil stains on the surface of the workpiece;
(6) Tempering: cleaning, putting the workpiece into a tempering furnace, keeping the temperature for 110min at the tempering temperature of 250 ℃, and cooling in air after discharging.
Comparative example 1 comparative method 1#
The differences between comparative method # 1 and heat treatment method # 1 are: comparative method # 1 had no preheating step.
Comparative example 2 comparative method 2#
The differences between comparative method 2# and heat treatment method 1# are: the temperature for carbonitriding in comparative method 2# was 900 ℃.
Comparative example 3 comparative method 3#
The differences between comparative method # 3 and heat treatment method # 1 are: in the step of quenching in the comparison method No. 3, the workpiece is immersed in quenching oil for quenching, and the temperature of the quenching oil is 70 ℃.
Examples of the experiments
The heat treatment method 1# -3# and the comparison method 1# -3# are adopted to respectively carry out heat treatment on 400 CRB 8127 retainers with the diameter of 365mm, the dimension standard required by a drawing is 365 +/-0.4, the retainers are unqualified when the dimension standard exceeds the range, and the qualification rate of final products is shown in table 1.
From the data, the retainer subjected to heat treatment by the method is small in the number of dimensional out-of-tolerance, the product yield is more than 97%, and the product quality is stable.
Compared with the method 1# without preheating step, the final qualified rate is not high, and the analysis reason is that the consistency of the internal temperature and the external temperature of the retainer is poor, the internal stress is large and the retainer is easy to deform; the co-permeation temperature of the comparison method No. 2 is high, the final qualified rate is not high, and the analysis reason is that the internal stress of the product is large; compared with the method 3# quenching oil, the temperature is low, the final qualified rate is not high, and the deformation is large due to the fact that the cooling speed is too high.
The above description is only an example of the present application, and the protection scope of the present application is not limited by these specific examples, but is defined by the claims of the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the technical idea and principle of the present application should be included in the protection scope of the present application.
Claims (7)
1. A method of heat treating a bearing retainer, comprising the steps of:
(1) Pretreatment: cleaning the workpiece to remove surface oil stains;
(2) Preheating: heating the workpiece to 300-350 ℃, preserving heat, discharging the workpiece out of the furnace, and performing carbonitriding within 5min;
(3) Carbonitriding: putting the preheated workpiece into a furnace, heating to 780-810 ℃, introducing carbon-containing gas and nitrogen-containing gas after the temperature is reached, and preserving the heat;
(4) Quenching: immersing the workpiece into quenching oil for quenching;
(5) Cleaning: cleaning residual quenching oil stains on the surface of the workpiece;
(6) Tempering: and (4) after cleaning, putting the workpiece into a tempering furnace, and after discharging, air cooling.
2. The heat treatment method according to claim 1, wherein the holding time in the step (2) is 60 to 90min.
3. The thermal processing method according to claim 1, wherein the carbon-containing gas in the step (3) is methanol, and the nitrogen-containing gas is ammonia gas.
4. The thermal treatment method according to claim 3, wherein the flow rate of methanol is 40 to 50mL/min and the flow rate of ammonia gas is 2 to 6L/min.
5. The heat treatment method according to claim 4, wherein the holding time in the step (3) is 50 to 70min.
6. The heat treatment method according to claim 1, wherein the quenching oil temperature in the step (4) is 130-140 ℃, the quenching time is 15-30min, and the oil is drained for 40-50min.
7. The heat treatment method according to claim 1, wherein the tempering temperature in the step (5) is 200 to 250 ℃, and the temperature is maintained for 110 to 130min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211461098.1A CN115717232A (en) | 2022-11-16 | 2022-11-16 | Heat treatment method of bearing retainer |
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| CN202211461098.1A CN115717232A (en) | 2022-11-16 | 2022-11-16 | Heat treatment method of bearing retainer |
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| CN115717232A true CN115717232A (en) | 2023-02-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117070735A (en) * | 2023-10-13 | 2023-11-17 | 江苏力星通用钢球股份有限公司 | Large roller heat treatment process for offshore wind power generation and engineering machinery |
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- 2022-11-16 CN CN202211461098.1A patent/CN115717232A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117070735A (en) * | 2023-10-13 | 2023-11-17 | 江苏力星通用钢球股份有限公司 | Large roller heat treatment process for offshore wind power generation and engineering machinery |
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