SKF was awarded the contract in 2009 with S - Oil companies, the contract goal is to better utilize SKF's enterprise resource planning system (ERP), through improved operation and maintenance practices and Slim bearing process systems, helping S - Oil Companies achieve important strategic objectives.
SKF's service department general manager, Mr. Vartan Vartanian spoke: "SKF help customers increase their assets so that they become more reliable and efficient Cross bearing. We also help S - Oil company to achieve health, safety and environmental standards (health and safety) of refinery. "
"SKF has helped S - Oil company to achieve important strategic objectives and have been transferred to a very efficient and professional way in the knowledge that our asset efficiency of operators and maintenance personnel who." S - Oil company's project manager JH Han commented.
SKF comprehensive service solutions, customers can solve the cause unplanned downtime, lost production, energy consumption and associated costs of most problems. It also includes the establishment of priorities, work planning and scheduling, job performance profiles, and the establishment of key strategic goals.
2013年9月28日星期六
2013年8月24日星期六
Bearing rings of cold treatment method
Quenching the bearing ring to cool to room temperature, immediately placed in an environment below room temperature a certain time, out at room temperature, this is lower than the processing temperature is called cold treatment. Bearing steel cold treatment is often used freezers and dry ice alcohol solution.
1 The role of cold treatment
Precision bearings for higher dimensional stability; ferrule hardened (especially quenching), the internal organization retains more residual austenite, this residual austenite is unstable organization, storage and use of bearings process will continue to change, thus changing the accuracy of the cross bearing. Therefore the use of cold treatment process, it can reduce tissue retained austenite, slightly increase the hardness of parts.
2 Cold Process
Stay at room temperature after quenching: quenching, must make uniform cooling to room temperature inside and outside the ring after the cold treatment, or easy to crack, cooled to room temperature immediately after cold treatment (usually no more than 30min), otherwise it will abort the austenite to martensite changes.
Cold treatment temperature: the temperature of cold treatment based primarily on termination of martensitic transformation temperature of the steel Mf, while also considering the cold treatment on the mechanical properties and process and other factors.
For GCr15 steel, cold treatment selection -70 ℃; accuracy is not very high ferrule or equipment limitations, the cold treatment temperature optionally -40 ~ -70 ℃; super precision bearings in the -70 ℃ ~ -80 ℃ between the cold treatment. Cold temperatures affect the bearing life impact fatigue and exposure.
Cold insulation: Although a large number of martensite is cooled to a certain temperature Tilting moment to complete, but the number of rings to make both surface and core part cold treatment to achieve uniform temperature, requires a certain holding time, usually 1 to 1.5 h.
Cold treatment after tempering: ferrule on the air after the cold treatment, the temperature was slowly warmed to room temperature tempering timely manner. Temperature can not be too fast, or easy to crack; tempering timely, otherwise the internal ferrule large residual stresses can cause cracking rings, generally no more than 2h.
1 The role of cold treatment
Precision bearings for higher dimensional stability; ferrule hardened (especially quenching), the internal organization retains more residual austenite, this residual austenite is unstable organization, storage and use of bearings process will continue to change, thus changing the accuracy of the cross bearing. Therefore the use of cold treatment process, it can reduce tissue retained austenite, slightly increase the hardness of parts.
2 Cold Process
Stay at room temperature after quenching: quenching, must make uniform cooling to room temperature inside and outside the ring after the cold treatment, or easy to crack, cooled to room temperature immediately after cold treatment (usually no more than 30min), otherwise it will abort the austenite to martensite changes.
Cold treatment temperature: the temperature of cold treatment based primarily on termination of martensitic transformation temperature of the steel Mf, while also considering the cold treatment on the mechanical properties and process and other factors.
For GCr15 steel, cold treatment selection -70 ℃; accuracy is not very high ferrule or equipment limitations, the cold treatment temperature optionally -40 ~ -70 ℃; super precision bearings in the -70 ℃ ~ -80 ℃ between the cold treatment. Cold temperatures affect the bearing life impact fatigue and exposure.
Cold insulation: Although a large number of martensite is cooled to a certain temperature Tilting moment to complete, but the number of rings to make both surface and core part cold treatment to achieve uniform temperature, requires a certain holding time, usually 1 to 1.5 h.
Cold treatment after tempering: ferrule on the air after the cold treatment, the temperature was slowly warmed to room temperature tempering timely manner. Temperature can not be too fast, or easy to crack; tempering timely, otherwise the internal ferrule large residual stresses can cause cracking rings, generally no more than 2h.
2013年8月19日星期一
Bearing Installation
Bearing is installed correctly, affecting accuracy, longevity, performance. Therefore, the design and installation of the bearing assembly department to be adequately studied. I hope to be in accordance with the operating standards for installation. The projects are usually operating standards are as follows:
1, cleaning bearings and related components
2, Check the connected components of size and precision machining conditions
3, the installation
4, check the cross bearing installed
5, the supply of lubricant
Recommend the use of open bearings package just before installation to prevent rust.
Bearing installation method due to the bearing structure, with the condition varies, in general, due to multi-axis rotation, so the inner ring needs interference fit. Cylindrical bore bearings, multi-pressed into the press or by thermal loading method. Cone of the occasion, mounted directly on the tapered shaft or sleeve installation. Most types of bearings are generally installed using the following method:
1, pressed into the press method
2, the thermal loading methods
3, the cooling method
In addition, also the use of advanced electromagnetic induction heating device for installation in a short time without fire, uniform heating oil, cleaner and more efficient installation. Please refer to the Division I bearing heater bearing removal bearing removal, is regular maintenance, when bearing replacement. After the demolition, if you want to continue to use or need to check the bearing of the state, its removal and installation should be carried out as carefully. Careful not to damage the bearings and the parts, especially the interference fit bearing removal, the operation is difficult, it is necessary to pay attention to. Bearing removal can be used presses, drawing fixtures, extrusion screws, induction heating equipment, hydraulic and other several ways.
1, cleaning bearings and related components
2, Check the connected components of size and precision machining conditions
3, the installation
4, check the cross bearing installed
5, the supply of lubricant
Recommend the use of open bearings package just before installation to prevent rust.
Bearing installation method due to the bearing structure, with the condition varies, in general, due to multi-axis rotation, so the inner ring needs interference fit. Cylindrical bore bearings, multi-pressed into the press or by thermal loading method. Cone of the occasion, mounted directly on the tapered shaft or sleeve installation. Most types of bearings are generally installed using the following method:
1, pressed into the press method
2, the thermal loading methods
3, the cooling method
In addition, also the use of advanced electromagnetic induction heating device for installation in a short time without fire, uniform heating oil, cleaner and more efficient installation. Please refer to the Division I bearing heater bearing removal bearing removal, is regular maintenance, when bearing replacement. After the demolition, if you want to continue to use or need to check the bearing of the state, its removal and installation should be carried out as carefully. Careful not to damage the bearings and the parts, especially the interference fit bearing removal, the operation is difficult, it is necessary to pay attention to. Bearing removal can be used presses, drawing fixtures, extrusion screws, induction heating equipment, hydraulic and other several ways.
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