I believe you are no stranger to roller bearings. In fact, roller bearings mainly rely on the rolling contact between parts to support rotating parts. Then different roller bearings bear different axial and radial forces, so the use environment has a great impact on roller bearings. Let Zhejiang roller bearing factory talk about the impact of the environment on roller bearings. Selecting the size and accuracy of the gauge according to the service position, service conditions and environmental conditions, and matching appropriate bearings are the premise to ensure the service life and reliability of angular contact ball bearings. Angular contact ball bearing is suitable for bearing the combined radial and axial load dominated by radial load. It is usually used in pairs with two sets of bearings. It is mainly used in the transmission parts of automobile, such as front and rear hubs, driving bevel gears, differential, reducer and so on. Under the condition of correct installation and good lubrication, it is allowed to be 0.3-0.5 times of the bearing limit speed. Under normal conditions, it is appropriate to use 0.2 times of the limit speed. Tapered roller bearings generally do not allow the shaft to tilt relative to the housing hole. If there is an inclination, it shall not exceed 2 '.
Bearing is very important for mechanical equipment. If there is no bearing, it will directly affect the operation of the equipment. Have you ever heard of deep groove ball bearing? This is a common one. The processing procedures of deep groove ball bearings have been improved in quality, which can improve the beauty of bearings and reduce friction. The following is a brief series to share the processing steps of deep groove ball bearings:
The smooth processing of mechanical equipment is inseparable from the assistance of bearings. The failure of machinery during normal operation is likely to be caused by bearing failure. Therefore, it is very important to learn how to store, install and disassemble bearings. Today, I will tell you about the skills of installing and disassembling bearings.
1. Pay attention to the operation of one-way bearing during use. In case of noise, impact and sudden increase in power, stop the machine immediately for inspection, eliminate the fault, and dismantle it for inspection if necessary. 2. Under the general strip plane bearing inspection parts, the one-way bearing shall be lubricated once every 60 hours of operation. In tropical areas, areas with high humidity, much dust, large temperature changes and continuous operation, the lubrication frequency shall be increased. New grease must be added before and after the machine stops running for a long time. Slowly rotate the one-way bearing during grease filling to fill the grease evenly. 3. Check the plane bearing frequently. Check the plane bearing to see if the seal is in good condition. If the plane bearing is found damaged in the plane bearing inspection, it shall be replaced in time. If it is found to fall off, it shall be reset in time. The tooth surface shall be replaced with grease regularly according to the working environment. During use, the user shall refill with new grease according to different working conditions. 4. Prevent the unidirectional shaft from being directly exposed to the sun during use. It is forbidden to directly flush the one-way bearing with water to prevent water from entering the raceway, and strictly prevent hard objects from approaching or entering the gear plane bearing to check the meshing area. The four aspects that should be paid attention to in the daily maintenance of one-way bearings need to be paid great attention. Through the above introduction, I believe you should have some understanding of our maintenance precautions for using one-way bearings. In fact, no matter what equipment or parts are in use, you must remember to carry out maintenance, We need to remember that we must not use water to flush the bearing directly, so there will be a big problem in plane bearing inspection, which will lead to equipment shutdown and even more serious plane bearing inspection. Therefore, we must pay attention to finding regular personnel for maintenance during maintenance.
Bearing is not only widely used in various machinery, but also plays a very important role in automobile wheels. It is mainly to make it run normally. So how to judge the quality of bearing from its appearance? The following points should be paid attention to in the appearance inspection: (1) Various cracks, such as raw material cracks, forging cracks, heat treatment cracks and grinding cracks, will become the source of stress concentration and expand rapidly in the later operation of the bearing, resulting in bearing fracture, which has a great impact on the service life and work safety of the bearing.
There are bearings in many engines. As long as the bearings fail, they will stop running and the work can not be carried out. If you want to improve the reliability of the engine, you need to start with the bearings. Next, I will introduce in detail the five measures to improve the reliability of the engine bearings.
Bearing steel is the raw material of traditional bearings. According to the production materials, bearings can be divided into bearing steel bearings and stainless steel bearings, as well as some less used aluminum alloy bearings. Bearing steel has very strict chemical composition requirements, so the chemical properties of bearing steel bearings are very stable, and there will not be much difference in mass production. Today, Xiaobian will introduce to you what is bearing steel bearing and its performance!
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The United States made a preliminary review of the change of anti-dumping situation against China's tapered roller bearings and their parts
On July 13, 2016, the US Ministry of Commerce issued a notice that it made a preliminary review of the anti-dumping situation changes of tapered roller bearings and parts other, finished and unfinished, which originated from or imported from China, and preliminarily ruled that Shanghai General Bearing Co., Ltd, Ltd.) resumed dumping of the products involved in the case during the investigation period, with a weighted average dumping margin of 9.81%. Therefore, it was preliminarily decided to resume the anti-dumping duty on the products produced and exported by Shanghai General Bearing Co., Ltd. The U. The United States coordinated tariff numbers of the products involved are 8482.20.00, 8482.91.00.50, 8482.99.15, 8482.99.45, 8483.20.40, 8483.20.80, 8483.30.80, 8483.90.20, 8483.90.30, 8483.90.80, 8708.70.6060, 8708.99.2300, 8708.99.4850, 8708.99.6890, 8708.99.8115 and 8708.99.8180. On February 11, 1997, the United States made an administrative review of anti-dumping of tapered roller bearings and their parts (finished or semi-finished products) originating from or imported from China and ruled to cancel the anti-dumping tax order of Shanghai General Bearing Co., Ltd. which is the precondition that Haitong Bearing Co., Ltd. above the tax cancellation will not dump the products involved in the case, and make clear that once the products are dumped again, The U.S. Department of Commerce may immediately resume the imposition of anti-dumping duties on it. On August 13, 2015, at the application of Timken Company, the U.
The express railway freight bearing project has entered the type test and is expected to be mass produced by the end of 2017
On July 20, Zhitong finance learned from the official wechat of Shanghai Electric (02727) that the 160km express train bearing project in the charge of the company has recently completed the sample trial production and entered the type test stage. The project is the first high-end intelligent equipment breakthrough project in Shanghai. After it is put into mass production, China's railway freight speed will move from about 80-100 kilometers per hour to the "fast era" of 160 kilometers per hour. It is understood that in 2015, China Railway Corporation established the 160 km / h express railway freight car project as a major subject in the technical field of railway freight cars, which puts forward higher performance requirements for the bearings, important parts of express railway freight cars. However, at present, the tapered bearings of foreign companies are mainly used for express freight cars with a speed of more than 160km / h. In order to meet the development needs of railway freight cars and shorten the gap with similar foreign bearing products, at the end of 2015, Shanghai Electric signed the letter of responsibility for the objectives of national major scientific and technological achievements transformation project with Shanghai Municipal Commission of economy and information technology, and began the development of 160km / h fast railway freight car bearing project. Statistics show that Shanghai Electric is one of the largest groups in the domestic equipment manufacturing industry. It has many industrial groups, such as power station, transmission and distribution, heavy industry, rail transit, mechatronics, machine tools, environmental protection, elevator, printing machinery and so on. Zhitong finance inquired Shanghai Electric's financial report and learned that its turnover in the first quarter of 2016 was 15.068 billion yuan (the same below), a decrease of 6.46% over the same period last year. The profit attributable to shareholders of the parent company was 469 million, a decrease of about 27.92% over the same period last year. Shanghai Electric said that at present, based on the completion of sample trial production, the company cooperates with Qingdao Sifang vehicle research institute to conduct type test on the fast bearing sample with a speed of 160 km / h. According to the plan, after overcoming the difficulties of heat treatment technology and measurement technology, through the performance test of samples, mass production is expected by the end of next year. Zhitong finance and economics learned that the newly developed bearings will be used in the fastest special railway freight train for luggage and parcel transportation in China developed by CNR. This type of train mainly transports drugs, electronic products, precision equipment and other goods with high added value and strong timeliness that are afraid of sun, rain and wind and snow. The maximum running speed of the train can reach 178.4 kilometers per hour, which will create the highest speed of railway freight cars in China. As of the closing of the 20th, Shanghai Electric reported HK $3.25, no rise or fall, with a trading volume of 5.93 million shares and a turnover of HK $19.3 million.
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