CN102359495A - Preparation method for inner and outer ring of bearing - Google Patents
Preparation method for inner and outer ring of bearing Download PDFInfo
- Publication number
- CN102359495A CN102359495A CN2011102598711A CN201110259871A CN102359495A CN 102359495 A CN102359495 A CN 102359495A CN 2011102598711 A CN2011102598711 A CN 2011102598711A CN 201110259871 A CN201110259871 A CN 201110259871A CN 102359495 A CN102359495 A CN 102359495A
- Authority
- CN
- China
- Prior art keywords
- finished product
- semi
- bearing
- making method
- preparation
- Prior art date
- 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.)
- Pending
Links
Abstract
The present invention provides a preparation method for an inner and outer ring of a bearing, and belongs to the technical field of heat treatment. According to the existing bearing steel preparation method in the prior art, the case of thermal expansion and contraction is easily generated after heat treatment, and stress release is serious, such that the bearing steel material becomes brittle, and the strength is reduced. With the preparation method provided by the present invention, the problems in the prior art are solved. The preparation method for the inner and outer ring of the bearing comprises the following steps: A, preparing a semi-finished product: carrying out rough mechanical processing and heat treatment for the blank; B, carrying out a freezing treatment: placing the semi-finished product in a refrigeration device, cooling the semi-finished product and holding the temperature, wherein the holding temperature is -60 to -70 DEG C, the holding time is 0.8-1.2 hours. According to the preparation method provided by the present invention, the freezing treatment is adopted, such that the residual austenite content can be reduced, the hardness of the part can be increased, the case of thermal expansion and contraction can be eliminated, the stress release can be reduced, the mechanical property of the inner and outer ring can be stabilized, and the service life of the inner and outer ring can be improved.
Description
Technical field
The invention belongs to the heat treatment technology field, relate to the making method of a kind of heat treatment process of bearing, particularly a kind of bearing enclose.
Background technique
Bearing is bearing pressure and frictional force greatly when work, uniform hardness and wear resistance so require Bearing Steel that height is arranged, and high limit of elasticity.The distribution of the content of the uniformity of the chemical composition of Bearing Steel, sonims and distribution, carbide etc. being required all very strict, is to require one of the strictest steel grade in all Iron and Steel Production.At present, mostly heat treatment is for quenching and low-temperature tempering for Bearing Steel commonly used, and the bearing of manufacturing can not thoroughly be eliminated internal stress and retained austenite from low-temperature tempering.Workpiece can deform in long preservation or using process.For avoiding this situation to take place, need carry out comparatively complicated heat treatment.
And bearing enclose is had relatively high expectations to dimensional stability; After Internal and external cycle quenches (especially step quenching); Interior tissue still keeps more austenite, and this retained austenite is unsettled tissue, is storing and is using in the bearing process; Can constantly change, thus the precision of change bearing.Adopt cold treatment process, it can reduce the retained austenite in the tissue for this reason, improves the hardness of part a little.
May further comprise the steps like the disclosed high nitrogen stainless bearing steel heat treatment process of State Intellectual Property Office of the People's Republic of China [publication No. CN101935752A, application number 201010247994.9]: 650 ± 10 ℃ of preheating temperatures, 25～35min; 850 ± 10 ℃ of secondary preheating temperatures, insulation 20～45min; 1060 ± 10 ℃ of quenching temperatures, insulation 50～60min; Be chilled to room temperature planted agent's half an hour after the quenching and carry out cryogenic treatment immediately, the cryogenic treatment temperature :-196 ± 5 ℃, 2～3h, 2 times; Carry out tempering immediately, tempering temperature after rising to room temperature after the cryogenic treatment: 160 ± 5 ℃, 4～4.5h, 2 times.The optimum treatment process of the present invention's final high nitrogen stainless bearing steel of 40Cr15Mo2VN of confirming on a large amount of experiment basis; Not only effectively control the content of retained austenite; Guarantee the dimensional stability problem of 40Cr15Mo2VN steel workpiece, and solved heat treated problem on deformation and crack problem.Though this heat treatment has improved the working life of Bearing Steel to a certain extent, to handle the rear bearing steel at higher temperatures and lower temperature and be easy to generate and expand with heat and contract with cold, stress relief is more serious, causes material to become fragile and intensity reduces.
Summary of the invention
The objective of the invention is to have the problems referred to above, proposed a kind of making method that reduces the bearing enclose of stress relief to existing technology.
The object of the invention can be realized through following technical proposal: a kind of making method of bearing enclose is characterized in that it comprises the steps:
A, making semi-finished product: blank is carried out mechanical roughing and heat treatment.After blank carried out mechanical roughing, adopt heat treatment, make semi-finished product possess mechanical propertys such as certain toughness, intensity, hardness, wear resistance, the performance that improves material makes its requirement that meets bearing and convenient follow-up fine finishing.
B, freezing processing: semi-finished product are located in the refrigeration plant, to semi-finished product cooling and insulation.Cooling and insulation make semi-finished product can eliminate the influence of expanding with heat and contract with cold that brings because of heat treatment, and half-finished performance can be settled out, and reduce stress relief, improve working life.
In the making method of above-mentioned bearing enclose, the temperature of semi-finished product cooling insulation is-60 ℃～-70 ℃ among the described step B.Since cold excessively temperature effect bearing impact fatigue with contact the life-span; So be chosen in-60 ℃～-70 ℃ and cool off insulation; Can reach and eliminate the purpose expand with heat and contract with cold and to reduce stress relief, again can Yin Wendu not cross low and influence the bearing impact fatigue and contact the life-span.
In the making method of above-mentioned bearing enclose, the time of semi-finished product cooling insulation is 0.8 hour～1.2 hours among the described step B.Though a large amount of martensitic transformations are accomplished being as cold as between the uniform temperature momentariness, all evenly reach the cryogenic treatment temperature for making the Internal and external cycle surface with heart portion, need certain holding time, be generally 0.8～1.2h.
In the making method of above-mentioned bearing enclose, described refrigeration plant is a crogenic box.The air turbine refrigerator of crogenic box adopts the turbine expansion technology, and refrigerant, power source are pressurized air, can produce-20 ℃～-1001 ℃ cold gas streams; Control accuracy is high, and refrigerating speed is fast, can reach technological temperature rapidly; Also has ultra thick insulation layer, high insulating effect.
In the making method of above-mentioned bearing enclose, in the described steps A be make according to the following steps half-finished: a, adopt lathe that blank is carried out turning; B, the blank after the turning is heat-treated; C, the blank after the heat treatment is roughly ground.
In the making method of above-mentioned bearing enclose, this making method is carried out fine finishing after also being included in completing steps B; The semi-finished product clamping that will pass through freezing processing finish grindes on lathe, obtains finished product.
Compared with prior art, this making method can not only reduce the content of retained austenite after adopting freezing processing, improves the hardness of part; Can also eliminate and expand with heat and contract with cold, reduce stress relief, stablize the mechanical property of Internal and external cycle, the working life of having improved Internal and external cycle.
Embodiment
The making method of this bearing enclose may further comprise the steps:
A, employing lathe carry out turning to blank;
B, the blank after the turning is heat-treated;
C, the blank after the heat treatment is roughly ground, obtained semi-finished product;
D, above-mentioned semi-finished product are carried out freezing processing: insulation is 0.8 hour～1.2 hours in-60 ℃～-70 ℃ crogenic box, reaches the mechanical property of usage requirement;
E, the semi-finished product after the freezing processing are carried out fine finishing, reach the size of assembly and use requirements;
F, with above-mentioned semi-finished product clamping refining surfaces to the lathe, obtain finished product.
Freezing processing is arranged between corase grind and the fine finishing, mainly is that freezing processing can improve half-finished hardness, after corase grind, be not easy to be out of shape, and the fine finishing finished surface smoother of coming out like this, the while also obtains more accurate size easily.
Through the bearing enclose that this preparation process obtains, stable performance, not yielding and fracture, improve 2 times or more than the Internal and external cycle that common process obtains working life.
Claims (6)
1. the making method of a bearing enclose is characterized in that, it comprises the steps:
A, making semi-finished product: blank is carried out mechanical roughing and heat treatment.
B, freezing processing: semi-finished product are located in the refrigeration plant, to semi-finished product cooling and insulation.
2. the making method of bearing enclose according to claim 1 is characterized in that, the temperature of semi-finished product cooling insulation is-60 ℃～-70 ℃ among the described step B.
3. the making method of bearing enclose according to claim 2 is characterized in that, the time of semi-finished product cooling insulation is 0.8 hour～1.2 hours among the described step B.
4. the making method of bearing enclose according to claim 3 is characterized in that, described refrigeration plant is a crogenic box.
5. according to the making method of claim 1 or 2 or 3 or 4 described bearing encloses, it is characterized in that, in the described steps A be make according to the following steps half-finished: a, adopt lathe that blank is carried out turning; B, the blank after the turning is heat-treated; C, the blank after the heat treatment is roughly ground.
6. according to the making method of claim 1 or 2 or 3 or 4 described bearing encloses, it is characterized in that this making method is carried out fine finishing after also being included in completing steps B; The semi-finished product clamping that will pass through freezing processing finish grindes on lathe, obtains finished product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102598711A CN102359495A (en) | 2011-09-03 | 2011-09-03 | Preparation method for inner and outer ring of bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102598711A CN102359495A (en) | 2011-09-03 | 2011-09-03 | Preparation method for inner and outer ring of bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102359495A true CN102359495A (en) | 2012-02-22 |
Family
ID=45584863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102598711A Pending CN102359495A (en) | 2011-09-03 | 2011-09-03 | Preparation method for inner and outer ring of bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102359495A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628096A (en) * | 2012-04-23 | 2012-08-08 | 人本集团有限公司 | Thermal processing process of bearing ring |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004301149A (en) * | 2003-03-28 | 2004-10-28 | Nsk Ltd | Ball bearing |
-
2011
- 2011-09-03 CN CN2011102598711A patent/CN102359495A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004301149A (en) * | 2003-03-28 | 2004-10-28 | Nsk Ltd | Ball bearing |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628096A (en) * | 2012-04-23 | 2012-08-08 | 人本集团有限公司 | Thermal processing process of bearing ring |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101576123B (en) | Process for manufacturing bearing ring | |
| CN112708732B (en) | High-frequency induction local tempering heat treatment method for high-nitrogen stainless bearing steel | |
| CN102029290B (en) | Cold rolling method for hard stainless steel band | |
| CN102758140B (en) | High-carbon microalloying steel ball and production process thereof | |
| CN102494106A (en) | Process for manufacturing 20 CrMo carburizing steel gear | |
| CN104525614A (en) | Production process of alloy steel material for high-strength internal hexagonal wrench | |
| CN104668907A (en) | Machining process for large spring pieces | |
| CN102676752A (en) | Thermal treatment process for die steel H13 of automobile forged piece | |
| CN103352112B (en) | Cryogenic process for prolonging service life of jet-moulded high-speed steel milling cutter | |
| CN103555923A (en) | Precision bearing cold and heat treatment technological method | |
| CN105689969A (en) | Guide post processing technology | |
| CN102953013A (en) | Preparation technology of die steel for hot-forging die and die-casting die | |
| CN109182680B (en) | Method for controlling annealing hardness of martensitic stainless steel rod wire for cold heading | |
| CN102517438A (en) | Technique method for eliminating residual stress on high speed steel grinding surface | |
| CN105983818A (en) | Technology for machining positioning rings | |
| CN102191358A (en) | GCr15 high-carbon chromium bearing steel hot forging billet waste heat temperature control ball annealing technology | |
| CN102359495A (en) | Preparation method for inner and outer ring of bearing | |
| CN104108010A (en) | Processing technology of ring gauge | |
| CN106425341A (en) | Boring shaft manufacturing method | |
| CN106808166A (en) | The manufacture craft of carburizing steel gear | |
| CN115505718A (en) | Composite heat treatment method for controlling residual austenite of bearing ring | |
| CN106854738A (en) | A kind of easy cutting plastic mold steel and its heat treatment method | |
| CN101363123A (en) | Composite technique of steel member surface shot-blasting and plasma low-temperature boriding | |
| CN102424904B (en) | Method for manufacturing motorcycle gears from 20CrMo carburizing steel | |
| CN104762561A (en) | Nitriding wearing-resistant steel and thermal treatment method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120222 |