CN101135344A - Rocker bearing high carbon-chrome steel outer ring composite treatment technology - Google Patents
Rocker bearing high carbon-chrome steel outer ring composite treatment technology Download PDFInfo
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- CN101135344A CN101135344A CNA2006100307180A CN200610030718A CN101135344A CN 101135344 A CN101135344 A CN 101135344A CN A2006100307180 A CNA2006100307180 A CN A2006100307180A CN 200610030718 A CN200610030718 A CN 200610030718A CN 101135344 A CN101135344 A CN 101135344A
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- rocker bearing
- outer ring
- steel outer
- high carbon
- treatment technology
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Abstract
The invention is characterized in that: 1. The inner ring and the outer ring of the rocker bearing is heated in an heating furnace under 815-830 degree C for 2-5 hours, at same time carbon potential 0.9-1.2 is charged into the heating furnace and the volume ratio to nitrogen potential is 3-6%; 2. The inner ring and the outer ring of the rocker bearing after heat treatment are coarsely ground and sprayed by ceramic pills whose diameter is 2-5mm in 40-100m/s speed for 15-30 minutes. Advantages: ideal residual autenite content, high surface pressure and long service life.
Description
Technical field
The present invention relates to the composite treatment technology of a kind of heat treatment and reinforcement process, particularly a kind of rocker bearing high carbon-chrome steel outer ring composite treatment technology.
Background technique
Rocker arm shaft of automobile engine holds the applying working condition that is in more special harshness in the engine operation of vehicle, in order to make bearing adapt to its special temperature, load, lubricating condition more, improve the working life of bearing, need aborning rocker arm shaft of automobile engine held and heat-treat.Conventional heat treatment residual austenite content is everlasting about 10%, can not satisfy the demand, and common reinforcement process bearing stress also has only 200～500Mpa, can not satisfy usage requirement.The heat treatment method of conventional GCr15 bearing ring is: 830～850 ℃ of heat tracings, quench, subsequently 160～190 ℃ of following tempering 2～4 hours.According to this heat treatment process, the bearing ring residual austenite content is 7～12%, and the surface is tensile stress state, and does not pass through enhancement process.The handicraft product of this processing is applied in motor car engine rocker, occurs wearing and tearing and crackle inefficacy easily at its special temperature, load, lubricating condition lower bearing, thereby causes the motor catastrophe failure, needs to change bearing and service engine.
Summary of the invention
The objective of the invention is to solve in the prior art rocker arm shaft of automobile engine holds and carries out the existing the problems referred to above of conventional heat treatment.A kind of rocker bearing high carbon-chrome steel outer ring composite treatment technology is provided.Technological scheme of the present invention is the design rocker bearing high carbon-chrome steel outer ring composite treatment technology, it is characterized in that: heat-treat the rocker bearing Internal and external cycle (1), in oven with 815～830 ℃ temperature, heated 2～5 hours, in oven, fill simultaneously carbon potential 0.9～1.2 and nitrogen gesture volume ratio 3～6%, (2), be that 2～5 millimeters ceramic pellet was with the speed injection of 40～100m/s 15～30 minutes with diameter then to the rocker bearing Internal and external cycle after heat treatment corase grind.It is characterized in that: heat-treat the rocker bearing Internal and external cycle (1), in oven with 820 ℃ temperature, heated 3.5 hours, in oven, fill simultaneously carbon potential 1.05 and nitrogen gesture volume ratio 5%, (2), be that the ceramic pellet of 3.5mm was with the speed injection of 70m/s 20 minutes with diameter then to the rocker bearing Internal and external cycle after heat treatment corase grind.Advantage of the present invention is can obtain desirable residual austenite content and very high bearing stress by this special processing COMBINED PROCESS, thereby the rocker bearing life-span is brought up to 250,000 kilometers by 100,000 kilometers.
Below in conjunction with embodiment the present invention is elaborated:
Embodiment
With external diameter 25mm, internal diameter 19mm, the bearing ring of width 12mm (high-carbon chromium steel GCr15) is an example, at first in mult-purpose chamber furnace, the rocker bearing lasso is heat-treated, in stove with 820 ℃ temperature, heat tracing 3.5 hours, heat maintenance 1.05 of furnace atmosphere carbon potential and nitrogen gesture volume ratio 5% (furnace gas volume ratio) simultaneously, insulation back Cooling Quenching in quenching oil, rocker bearing lasso after the heat treatment is roughly ground external diameter on external cylindrical grinding machine, lasso after the corase grind is put into compressed air shotblasting machine, the ceramic pellet that with diameter is 3.5mm was freely sprayed 20 fens with the speed of 70m/s, obtained the bigger bearing stress in surface.
After adopting this heat treatment process and corase grind shot-peening, realized bearing surface remained austenite content 15%～20%; Obtain surface compress residual stresses 400～1000Mpa.
After testing and the test, data are as follows:
After a collection of this special thermal treatment and surface Hardening Treatment, as follows by the selective examination testing result:
(1), as follows by the selective examination testing result by after a collection of this special thermal treatment and the surface Hardening Treatment:
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
| Paralympic content % | 16.3 | 16.4 | 15.8 | 18.2 | 16.4 | 18.7 | 16.4 | 17.5 | 16.5 | 18.2 |
| Pressure stress MPa | 567 | 590 | 615 | 700 | 765 | 560 | 580 | 780 | 890 | 590 |
(2), according to bearing machinery industry standard JB/T1255-2001, JB/T50013-2000, bearing is strengthened fatigue test and is undertaken by standard JB/T50013-2000 requirements, test result demonstration bearing life reaches 12L10, reliability is greater than 90%.Calculate according to test result to be applied in the motor car engine actual conditions by bearing can to reach 200,000 kilometers reliability be 99.9% that the reliability that reaches 250,000 kilometers is 90%.
Claims (2)
1. rocker bearing high carbon-chrome steel outer ring composite treatment technology is characterized in that:
(1) the rocker bearing Internal and external cycle is heat-treated, in oven,, heated 2～5 hours, keep 0.9～1.2 at heating furnace atmosphere carbon potential simultaneously with 815～830 ℃ temperature, nitrogen gesture volume ratio 3～6%,
(2), be that the ceramic pellet of 2～5mm was with the speed injection of 40～100m/s 15～30 minutes with diameter then to the rocker bearing Internal and external cycle after heat treatment corase grind.
2. by the described rocker bearing high carbon-chrome steel outer ring composite treatment technology of claim 1, it is characterized in that: heat-treat the rocker bearing Internal and external cycle (1), with 820 ℃ temperature, heated 3.5 hours in oven, simultaneously in carbon potential maintenance 1.05 of heating furnace atmosphere and nitrogen gesture volume ratio 5%
(2), be that the ceramic pellet of 3.5mm was freely sprayed 20 fens with the speed of 70m/s with diameter then to the rocker bearing Internal and external cycle after heat treatment corase grind.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100307180A CN101135344A (en) | 2006-08-30 | 2006-08-30 | Rocker bearing high carbon-chrome steel outer ring composite treatment technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100307180A CN101135344A (en) | 2006-08-30 | 2006-08-30 | Rocker bearing high carbon-chrome steel outer ring composite treatment technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101135344A true CN101135344A (en) | 2008-03-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006100307180A Pending CN101135344A (en) | 2006-08-30 | 2006-08-30 | Rocker bearing high carbon-chrome steel outer ring composite treatment technology |
Country Status (1)
| Country | Link |
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| CN (1) | CN101135344A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101576123B (en) * | 2008-05-09 | 2012-11-28 | 嵊州市美亚特种轴承厂 | Process for manufacturing bearing ring |
| CN102906282A (en) * | 2010-08-05 | 2013-01-30 | 新东工业株式会社 | A method for shot peening |
| CN103307110A (en) * | 2012-03-15 | 2013-09-18 | 安顺市虹翼特种钢球制造有限公司 | Enhanced treatment method of bearing ring trench |
| CN116214370A (en) * | 2023-05-10 | 2023-06-06 | 常州海洛轴承制造有限公司 | Rocker arm bearing detection device and detection method |
-
2006
- 2006-08-30 CN CNA2006100307180A patent/CN101135344A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101576123B (en) * | 2008-05-09 | 2012-11-28 | 嵊州市美亚特种轴承厂 | Process for manufacturing bearing ring |
| CN102906282A (en) * | 2010-08-05 | 2013-01-30 | 新东工业株式会社 | A method for shot peening |
| CN103307110A (en) * | 2012-03-15 | 2013-09-18 | 安顺市虹翼特种钢球制造有限公司 | Enhanced treatment method of bearing ring trench |
| CN116214370A (en) * | 2023-05-10 | 2023-06-06 | 常州海洛轴承制造有限公司 | Rocker arm bearing detection device and detection method |
| CN116214370B (en) * | 2023-05-10 | 2023-07-04 | 常州海洛轴承制造有限公司 | Rocker arm bearing detection device and detection method |
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Application publication date: 20080305 |