CN103045840A - High-pressure crushing thermal processing method for steel ball special for bearing of 5MW (Megawatt) large wind turbine unit - Google Patents
High-pressure crushing thermal processing method for steel ball special for bearing of 5MW (Megawatt) large wind turbine unit Download PDFInfo
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- CN103045840A CN103045840A CN 201210484243 CN201210484243A CN103045840A CN 103045840 A CN103045840 A CN 103045840A CN 201210484243 CN201210484243 CN 201210484243 CN 201210484243 A CN201210484243 A CN 201210484243A CN 103045840 A CN103045840 A CN 103045840A
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Abstract
The invention relates to a high-pressure crushing thermal processing method for a steel ball special for a bearing of a 5MW (Megawatt) large wind turbine unit. The method consists of the steps of quenching, tempering and detecting. In the quenching and heating step, the shielding gas flow is sectionally controlled. As a characteristic that a wind power steel ball is large in size so that the working allowance in the machining process is large and a characteristic that the cooling rate of Na2CO3 solution is greater than that of oil at high temperature are adequately utilized, the thermal treatment crushing value is greatly increased based on a carbon-denuded layer/decarburized layer within working allowance depth. The depth of the carbon-denuded layer/decarburized layer is realized by controlling the size and the time of the shielding gas flow. Tests show that for the high-pressure crushing wind power balls with the outer diameter being over 40.0000mm, the primary crushing yield reaches 100%. Through the tests and statistics, the crushing mean value and the scatter difference of a product after thermal treatment adjustment are respectively improved by 15% and 30% compared with those before the adjustment. A steel ball thermal treatment index completely satisfies the demands of wind power equipment.
Description
Technical field
The present invention relates to a kind of steel ball heat treatment process, particularly a kind of centre hardness meets international standard, and batch little 5MW level large-scale wind electricity unit bearing special-purpose steel ball high crush heat treatment process method of scattered error.
Background technology
Be accompanied by the rise of global wind-powered electricity generation industry, wind power bearing has obtained develop rapidly, and as the wind power bearing bearing part, steel ball quality more and more obtains concern and the attention of wind-power electricity generation industry.Many weeks, under the guaranteed prerequisite of quality of materials, thermal treatment plays decisive action to ball hardness, metallographic, crushing equal life index.Because domestic industry and external some difference of wind-powered electricity generation industry control target, abroad mainly take the control centre hardness as main, and domestic correspondent is mostly take high crush as main.Because the very difficult requirement that guarantees GB of thermal treatment crushing, and batch scattered error is large, and therefore on the basis of comparing synchronously, it is imperative to the high crush steel ball heat treatment process of high qualification rate to research and develop.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of centre hardness and meets international standard, and batch little 5MW level large-scale wind electricity unit bearing special-purpose steel ball high crush heat treatment process method of scattered error.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of 5MW level large-scale wind electricity unit bearing special-purpose steel ball high crush heat treatment process method is made of quenching, tempering, detection three steps; Its innovative point is: described quenching adds thermal recovery segmentation control shielding gas flow amount, and is concrete, opens protection gas and discharge foreign gas after steel ball advances stove, and flow control is at 10-15ml/min; After reaching quenching temperature, steel ball closes protection gas, and insulation for some time, soaking time 58-92min, quenching temperature is 830-850 ℃; Described quenchant Na
2CO
3Solution, concentration is controlled at 6-7%; In the described tempering stage, tempering temperature is 200-210 ℃, and soaking time is 300-320 minute.
Further, described protector is dissociated methanol gas.
The invention has the advantages that: utilize the wind power steel ball size larger, make the large characteristic of its process redundancy in the course of processing, take full advantage of Na
2CO
3Solution is in the high temperature cooling rate characteristics faster than oil, be no more than the process redundancy degree of depth poor/the Decarburized layer basis on, realized the significantly raising of thermal treatment crush values, take off/the carbon poor layer degree of depth realizes by control shielding gas flow amount size and time.After tested, the high pressure wind-crushing electric ball that ￠ 40.0000mm is above, the crushing first-time qualification rate reaches 100%.By test and statistics, before adjusting, the finished product crushing average after the thermal treatment adjustment and scattered error improve respectively 15% and 33%, and steel ball hot is processed index and is satisfied the wind power equipment requirement fully.
Embodiment
At first, debugging wind power steel ball equipment for Heating Processing is controlled quenching temperature well; tempering temperature and shielding gas flow amount and quenching medium concentration guarantee that all kinds of parameters are in slave mode, prepare for wind power steel ball quenches: during setting; iron shot hardening temperature 830-850 ℃, tempering temperature 200-210 ℃, Na
2CO
3Strength of solution 6-7%.
Concrete: the wind power steel ball of ￠ 40mm specification guarantees quenching temperature 830-840 ℃ (temp controlled meter is arranged at 835 ℃), tempering temperature 200-205 ℃, Na
2CO
3Strength of solution 6-7%;
The wind power steel ball of ￠ 50.8mm specification guarantees quenching temperature 835-845 ℃ (temp controlled meter is arranged at 840 ℃), tempering temperature 205-210 ℃, Na
2CO
3Strength of solution 6-7%;
The wind power steel ball of ￠ 60 mm specifications guarantees quenching temperature 840-850 ℃ (temp controlled meter is arranged at 845 ℃), tempering temperature 205-210 ℃, Na
2CO
3Strength of solution 6-7%;
Then, place the wind power steel ball equipment for Heating Processing to quench wind power steel ball and heat the about 80-90kG of the weight of wind power steel ball; after adding in the equipment for Heating Processing, opens by steel ball protection gas; this protection gas adopts dissociated methanol gas, and the control flow is 10-15ml/min, reach the quenching temperature of setting when steel ball after; close again protection gas; in this process, protection gas approximately continues to pass into 20 minutes, closes protection gas and is incubated for some time; soaking time 58-92min, the quenching of coming out of the stove.
Wherein: the wind power steel ball of ￠ 40 mm specifications, soaking time are 58-62 minute;
The wind power steel ball of ￠ 50.8 mm specifications, soaking time are 73-77 minute;
The wind power steel ball of ￠ 60 mm specifications, soaking time are 88-92 minute;
When wind power steel ball is come out of the stove and quenched, allow body of heater have a down dip, allow steel ball naturally fall into Na with the quenching frock
2CO
3Quench in the medium solution, it is cold in the lump with medium then to come out of the stove with medium, and this time must not be less than 10 minutes.Steel ball after cold hangs out medium immediately, prepares tempering.
Wind power steel ball tempering: will put into tempering stove through the steel ball that quenches, and under 200-210 ℃ temperature, carry out tempering, and insulation was come out of the stove after 300-320 minute.
Wind power steel ball is quenched, the tempering crush index detects: detect each furnace pressure is broken in strict accordance with the JB/T1255-2001 standard, greater than the requirement of thermal treatment crush index, it is qualified namely to be judged to, and production can circulate.Otherwise, be considered as defective.
Wind power steel ball technological test and the demonstration of three kinds of specifications parameters the results are shown in following table:
Annotate: stay the mill amount to refer to the thermal treatment surface to the process redundancy between the finished product, before the steel ball finished product enters the storehouse, do not allowed to take off, carbon poor layer, namely the maximum of thermal treatment control take off/the carbon poor layer degree of depth must be less than staying the mill amount.Steel ball takes off/and the carbon poor layer degree of depth realizes by control shielding gas flow amount size and time.The single-sided process surplus of ￠ 40.0000～60.0000mm specification steel ball is controlled at 0.35～0.45mm, considers that heat-treated sturcture changes, and total process redundancy will reach 0.40～0.60mm.If poor/Decarburized layer full depth is no more than 0.3mm, when crush index is fully guaranteed, other indexs will not have any impact, and therefore setting poor/Decarburized layer full depth is no more than 0.3mm.
￠ 40 specification ball technological tests and effect assessment table
。
￠ 50.8 specification ball technological tests and effect assessment table
￠ 60 specification ball technological tests and effect assessment table
In sum, thermal treatment crushing result is all greater than more than 15% of respective standard requirement.
The wind power steel ball that the thermal treatment crush index is qualified circulates successively to operation productions such as abrading-ball, early grind, lappingouts, until finished product.
Claims (2)
1. a 5MW level large-scale wind electricity unit bearing special-purpose steel ball high crush heat treatment process method is made of quenching, tempering, detection three steps; It is characterized in that: described quenching adds thermal recovery segmentation control shielding gas flow amount, and is concrete, opens protection gas and discharge foreign gas after steel ball advances stove, and flow control is at 10-15ml/min; After reaching quenching temperature, steel ball closes protection gas, and insulation for some time, soaking time 58-92min, quenching temperature is 830-850 ℃; Described quenchant Na
2CO
3Solution, concentration is controlled at 6-7%; In the described tempering stage, tempering temperature is 200-210 ℃, and soaking time is 300-320 minute.
2. 5MW level large-scale wind electricity unit bearing special-purpose steel ball high crush heat treatment process method according to claim 1, it is characterized in that: described protector is dissociated methanol gas.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210484243 CN103045840A (en) | 2012-07-31 | 2012-11-26 | High-pressure crushing thermal processing method for steel ball special for bearing of 5MW (Megawatt) large wind turbine unit |
| CN201310571050.0A CN103667611B (en) | 2012-07-31 | 2013-11-13 | Large-scale wind electricity unit bearing special-purpose steel ball high crush thermal treatment process |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210268104 | 2012-07-31 | ||
| CN201210268104.1 | 2012-07-31 | ||
| CN 201210484243 CN103045840A (en) | 2012-07-31 | 2012-11-26 | High-pressure crushing thermal processing method for steel ball special for bearing of 5MW (Megawatt) large wind turbine unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103045840A true CN103045840A (en) | 2013-04-17 |
Family
ID=48058699
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210484243 Withdrawn CN103045840A (en) | 2012-07-31 | 2012-11-26 | High-pressure crushing thermal processing method for steel ball special for bearing of 5MW (Megawatt) large wind turbine unit |
| CN201310571050.0A Active CN103667611B (en) | 2012-07-31 | 2013-11-13 | Large-scale wind electricity unit bearing special-purpose steel ball high crush thermal treatment process |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310571050.0A Active CN103667611B (en) | 2012-07-31 | 2013-11-13 | Large-scale wind electricity unit bearing special-purpose steel ball high crush thermal treatment process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107312923A (en) * | 2017-07-15 | 2017-11-03 | 芜湖乾凯材料科技有限公司 | A kind of high crush load steel ball and its processing method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101280353A (en) * | 2008-05-26 | 2008-10-08 | 江苏力星滚动体工程技术研究中心有限公司 | Hardness heat treatment quenching process for center of steel ball specifically for wind generating equipment |
| CN102537069A (en) * | 2012-03-13 | 2012-07-04 | 江苏力星通用钢球股份有限公司 | Steel ball special for bearing of large-scale offshore wind power generator group and manufacturing process for steel ball |
-
2012
- 2012-11-26 CN CN 201210484243 patent/CN103045840A/en not_active Withdrawn
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2013
- 2013-11-13 CN CN201310571050.0A patent/CN103667611B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107312923A (en) * | 2017-07-15 | 2017-11-03 | 芜湖乾凯材料科技有限公司 | A kind of high crush load steel ball and its processing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103667611B (en) | 2015-12-02 |
| CN103667611A (en) | 2014-03-26 |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20130417 |