high speed bearings
When mounting, the raceway and roller of this kind high speed bearings must not imposed any force when the bearing is mounted on the shaft neck or housing hole, The high speed bearings should be heating or cooling in advance during interference fitting.
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"High Speed Bearings"
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High speed bearings are also called spindle bearings, its feature are high precision.
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"High Speed Bearings"
BlogThe government will be great support from the policy |
11-03 |
Hunan Xiangtan city leaders to guide the work of Timken CompanyTIMKEN TIMKEN Bearing Company China Limited Hunan Xiangtan municipal leaders 2010.04.30 Tao , deputy inspector of new water Deputy Minister , Office Yuan Xihui City Code , City Code Office deputy researcher Wu Ming and other city leaders to Hunan Xiangtan Timken company guidance .Hunan Timken Company general manager , Mr. James Ai Gete water to guide the work of the new pottery reported roller bearing company Hunan TIMKEN COMPANY , and government leaders attach importance to and guide the company deeply grateful. Xiangtan City , Hunan Leading Tao fresh water to guide the work of Timken Company , said: "The government will be great support from the policy , the working group at any time improve coordination of services , the company provides a good investment environment . Provide good service for the enterprise , and effectively solve problems for them . "About Timken Company in Hunan : Hunan Timken Bearing Company is the world's largest earlier this year by the United States, one bearing manufacturer Timken Company and Xiangtan Electric Manufacturing Co., Ltd. joint venture , mainly the production of large wind turbine drive spindle Timken bearings , located in Xiangtan high-tech Zone industrial Park in Germany , is the Timken in China 's first six plants. (Timken bearings distributor in China Editor )
For wind turbine SKF XL hybrid ceramic bearings advent |
09-17 |
For wind turbine SKF XL hybrid ceramic bearings adventNowadays, designed for large wind turbine design and development can be isolated from the current SKF XL hybrid ceramic deep groove ball crossed roller have come out. Follow SKF bearings distributor in China, to understand for wind power generation SKF XL hybrid ceramic bearings.SKF XL hybrid ceramic bearings unique design, slewing ring bearing rings made of steel bearing products made by a ball bearing grade silicon nitride (Si3N4) is made of high hardness and low density. In addition to excellent electrical insulation capabilities, SKF XL hybrid ceramic deep groove ball bearing design give full play to the role of lubricants, even in the case of poor lubrication ensures long-term performance.Therefore, SKF Bearings by downtime and maintenance costs to a minimum, thereby reducing the life-cycle costs and total operating costs.According to Timken bearings distributor in China introduced, Timken Company and Goldwind Group offers more than 1,500 megawatts of wind power products, including bearings, gear box system, seals, lubrication products, online condition monitoring systems and technical support services, including a full life cycle solution. Timken president of China See Leong Fang (Shi-Long Feng), said: "This cooperation with Goldwind Group, it will be possible to jointly develop a more efficient green power generation technology, combined with the advanced experience of centuries Timken Company, we are willing to China Renewable resource requirements, and contribute to promoting global development. "Xinjiang Goldwind Science & Technology Co., Ltd. Mr. Wu Gang, Chairman and CEO, said: "We are pleased to be with and companies such as Timken bearings world's leading turbine parts supplier cooperation, which allows us steady growth, expanding the wind group in the country and the rapid development of foreign countries.
High speed bearings for what material it |
08-30 |
Speed bearings of the timber has its unique aspects . When dmn value is small , the bearing damage can take the form of surface or subsurface fatigue spalling , and when the dmn value of over 2.5 million , the fatigue crack to develop in depth layer , the inner ring will become severe block peeling. In this regard , the surface strength can be high, the internal high toughness steel ferrule hardened . Typical of such steels such as AISI8620, CBS600, CBSl000M and VASCOX-2 and so on.
Sometimes because of their high speed bearing high temperature , or high temperature environment , but the high temperature conditions than the general requirements vary . For example , ; at a temperature of 220 ℃ to work under high-speed bearings , but required by the selected temperature 315 ℃ materials, which is due to high speed bearings require a higher temperature hardness to withstand high speed when the deformation caused by the effects of the trend . High temperature steels are commonly used in high-speed bearing M50, M2, WB49 and M315 , etc. , which used vacuum induction melting method followed by vacuum arc remelting method M50 steel than simply using vacuum induction melting method M50 steel life expectancy has increased more than 5 times , therefore used more often.
Although high speed bearings corrosion problem does not seem to be directly involved , but there are quite a few high-speed bearings proportion of corrosion due to material failure in the face of such problems , we can use corrosion-resistant alloys , chromium ion implantation M50 steel and silicon nitride ceramics and other materials for bearings .
Requirements of high-speed bearing cage made of a material with high strength in demanding situations can be AMS 4616 silicon bronze , S- Monel alloy. The most common is the use of iron-based alloys AISl4340 (AMS6415), requires heat treatment hardness HRC28 ~ 36 range. To further improve the friction characteristics of the holder , usually the surface is also coated with a 20-50μm silver film ( such as AMS2412 and 2410 ) .
Ceramic materials in high-speed bearings in applications expected to have greater prospects , wherein the silicon nitride Si3N4 M50 steel material is higher than the life , and its weight is only 40% of the steel has been used to manufacture the rolling element or ring , and confirmed that there are excellent high-speed, high adaptability and corrosion resistance , but the current high cost of manufacturing .
How to install high-speed bearings |
08-30 |
Installation with high-speed bearings and adjustment :
A high speed bearings with clearance and according to both the high-speed precision bearings bearing requirements, but also according to temperature bearing requirements, so consider the coordination and clearance to take account of the following points:
( 1 ) when the temperature rose to high temperature dimensional change and hardness ;
( 2 ) high speed, the centrifugal force caused by the force system change and shape change .
In short, high-speed , high-temperature conditions, coordination and clearance from the choice of the bearing should strive to maintain the accuracy and performance , it is difficult.
In order to ensure the bearing raceway after installation of small deformation , interference fit amount of interference can not get too big, and high speed centrifugal force and high temperature thermal expansion , or offset with the surface normal pressure . Or so with the surface relaxation , so the amount of interference must be considered under the premise of these two factors be carefully calculated , at room temperature constant speed and effective amount of interference for high-speed bearings may be invalid .
If the calculation results of this contradiction is too large ( usually only in the ultra high speed only in this case ) , only by taking the lubrication ring lubrication and hydrostatic lubrication with a double measure , and this solution has the potential to break the bearing dmn value 3 million mark.
High temperature thermal expansion , or offset with pressure normal to the surface . Or so with the surface relaxation , so the amount of interference must be considered under the premise of these two factors be carefully calculated , at room temperature constant speed and effective amount of interference for high-speed bearings may be invalid .
If the calculation results of this contradiction is too large ( usually only in the ultra high speed only in this case ) , only by taking the lubrication ring lubrication and hydrostatic lubrication with a double measure , and this solution has the potential to break the bearing dmn value 3 million mark.
In considering the high speed bearing clearance is not only to consider the above factors , but also to consider the thermal elongation axis of the impact on the clearance required bearing in working condition , that there is at operating temperature optimum clearance , which kind of clearance is taken into account , the outer ring ball groove center precise alignment of state formation . As high-speed bearings for lower relative sliding and internal friction , it is best not to use the inner and outer rings relative axial displacement method to adjust the ball bearing clearance .
In considering the amount of interference with the bearing and clearance, to note that materials at high temperatures becomes soft and easily deformed features , as well as many from the room temperature to high temperature changes cause some permanent deformation possibilities.
(2) the requirement for host-related parts
Where the rotational speed bearing system requires precision bearing dynamic balancing shaft and the bearing seat hole installation site should have higher than normal required size and shape precision accuracy , especially for concentricity and retaining shoulder seat hole or journal vertical, and in consideration of these issues , it must also be noted that the high-speed operation of the bearing element and the temperature factor.
Shaft support systems require both high rigidity , and quality requirements as light as possible , in order to overcome this contradiction can be taken , such as reducing the surface roughness and improve surface hardening measures to improve the supporting stiffness , the use of hollow shaft to reduce system quality.