Application and maintenance of deep groove ball bearings
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| Time：2016.08.30 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
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Since the reform and opening up, as we join the WTO gradually emerge from international competition, Chinas bearing industry has been steady and rapid development.
According to the National Bureau of Statistics report, the 2004 national bearing industry and state-owned and state holding enterprises with annual sales of 500 million yuan of non-public enterprises has reached 927, 2003, bearing industry reached 41 million units, sales revenue of 39.2 billion yuan bearings, Chinas bearing sales have moved up to No. 4 in the world, to become the worlds largest producer of bearings. Especially micro, small deep groove ball bearings have become the countrys largest production capacity in the world. (Source: China Economic Net)
Deep groove ball bearings as the bearing of one subclass, because of its wide application, long service life, is widely used in modern equipment manufacturing, machining accuracy and quality of the equipments has been a large increase, it can be said deep groove ball bearings facilities and equipment in the future will get a lot of applications ,, its market prospects will be more broad.
Deep groove ball bearings are widely used due to common perception of the majority of workers, equipment, its excellent performance to be accepted. I engaged in machinery and equipment maintenance for many years, touching many deep groove ball bearing, its installation and maintenance have more understanding, summed up some experience to explore with you.
Outline
Deep groove ball bearings are generally a pair of rings a cage, just a group consisting of ball and a set to keep structure as deep groove ball bearing type code of 6. The production is the most common and most widely used class of bearings. Deep groove ball bearing structure is simple, easy to use, is the largest production volume, bear certain axial load. when the bearing radial clearance increased, with angular contact ball bearings, can withstand large axial load. ,
Deep groove ball bearings are mainly used for pure radial loads, but also to support radial load and axial load, when it is only pure radial loads, the contact angle is zero. When the deep groove ball bearings with a larger radial clearance, the performance with angular contact bearings can bear large axial load. Deep groove ball bearing friction coefficient is small, the limit speed is also high, especially in the very high speed axial load conditions, deep groove ball bearings thrust ball bearings are more advantages. comparison with other types of bearings of the same size, such bearings friction coefficient is small, extreme high speed. in high speed should not be using the case of thrust ball bearing such bearings can withstand axial load. Deep groove ball bearings installed in the shaft after the axial displacement of shaft or housing can limit the axial clearance in the bearing. Meanwhile, when the housing hole and shaft (or outer ring of the inner ring) relatively tilted, (no more than 8-16 determined according to clearance) can still work properly, however, that the presence of tilt, is bound to reduce bearing life.
Deep groove ball bearings and other types of bearings of the same size as compared to the minimum friction loss, high speed limit, should not be used in the case of high speed thrust ball bearings, these bearings can be used to bear pure axial load. Should improve its manufacturing precision, and the use of bakelite, bronze, aluminum and other materials hard solid cage, the speed can be increased.
Deep groove ball bearings Features
Deep groove ball bearing structure is simple, easy to reach compared with other types of manufacturing high precision, so easily into a series of mass production, and lower manufacturing costs, the use of very common. Select a larger axial clearance radial load carrying capacity increases, the contact angle of pure radial force is zero. Axial force, the contact angle is greater than zero. Commonly used stamping Ribbon Cage, machined solid cage, sometimes with nylon frame addition to the basic type deep groove ball bearings, there are a variety of structural modifications, such as: deep groove ball bearings with dust cover; with rubber. ring of deep groove ball bearings; stopper groove deep groove ball bearings; ball gap large load capacity of deep groove ball bearings; double row deep groove ball bearings but they all have the following common characteristics:
1, the structure of each ring of deep groove ball bearings have a cross-section of approximately one-third of the circumference of the ball of the continuous groove type raceway. It is mainly used to bear radial load, but also bear certain axial to load;
2, the bearing radial clearance increases, with the nature of angular contact ball bearing can withstand both directions alternating axial load;
3, low friction, high speed;
4, the structure is simple, low cost, easy to achieve high manufacturing precision;
5, generally use stamping ribbon cage, the inner diameter of 200mm or greater than high speed bearings, with machined solid cage.
Install application maintenance
Deep groove ball bearings are most representative of the rolling bearing, widely used. For high speed or high speed operation, and very durable, low maintenance costs and long operating cycle, but require periodic inspection and maintenance of professional and technical personnel to ensure the operational safety, reliability, quality and improve the operating cycle.
A deep groove ball bearing assembly
Deep groove ball bearing assembly requires assembly personnel have high expertise in the assembly process in the strict implementation of technical requirements and procedures.
Bearing installation of good or bad, will affect the accuracy of bearing life and performance. Therefore, thoroughly research bearing shall be installed in accordance with the following operating standards bearing installation.
1 cleaning bearings and related parts (bearings already greased and with seals or shields on both sides, the front ring bearing installation without washing.).
2 Check the size and finishing conditions related parts.
3 Bearing installation method should be installed in accordance with the nature of the bearing structure, size and bearing components, depending on the pressure should be directly added to the tight fit obtained ferrule end surface must not pass through the rolling pressure.
Bearing installation generally use the following method:
Press-fit: the bearing inner ring and the shaft so that a tight fit, the outer ring and the bearing hole is relatively loose fit, can be pressed presses the bearing on the shaft and the shaft together with the bearing mount together with the bearing hole, when pressure mounted on the inner end surface of the bearing pad a soft metal material of the mounting sleeve (copper or soft steel), bearing outer ring and the bearing hole tight fit, when the inner ring and the shaft is relatively loose fit, may be bearing be pressed into the bearing hole, then assemble the outer diameter of the sleeve should be slightly smaller than the diameter of the housing bore. If the bearing ring and the housing bore and the shaft are a tight fit, installation of interior and outer ring to be pressed into the shaft and at the same time seat hole, cannula assembly structure should be able to simultaneously charge tight end face bearing inner and outer rings.
Heating with: By heating bearings or bearing, the use of thermal expansion of the tight fit into a song with the installation method is a commonly used method of installation and labor-saving method is suitable for this large amount of interference of the bearing installation, hot charging ago the bearing or separable bearing rings into the tank uniform heating 80-100 ℃, then remove from the oil on the shaft as soon as possible in order to prevent the cooling face and the inner shaft shoulder fit is not tight, the bearings after cooling can be axially fastened when the bearing outer ring and light metal bearing tight fit, the use of heating bearing thermal loading method, can be avoided with the surface by abrasion. When the tank is heated by the bearing, a certain distance away from the bottom of the gate should network, or with a hook hanging bearings, can not be put on the bottom to prevent impurities entering the bearing Shen or uneven heating, the tank must have a thermometer, strictly control the oil temperature must not exceed 100 ℃, in order to prevent tempering effect, reduce the hardness of the rings.
Bearing installation method, under normal circumstances is mostly the case of shaft rotation, and therefore with the inner ring and the shaft with the win too, with the bearing outer ring and bearing housing clearance fit. Check the bearing operation after the end of the bearing installation, it should immediately be operation inspection, it was determined whether the normal installation.
Two maintenance operation
Maintenance work is to ensure reliable long-term operation of the main bearing means, equipment running for some time is necessary and timely please professional and technical personnel to carry out inspection, maintenance equipment, mainly in the following aspects:
1 Check the bearing operating temperature, requiring below 65 degrees.
2 Check the amount of axial movement of moving parts, mainly bearing clearance is not satisfactory.
3 Check whether the inner and outer runway bearing pitting, corrosion, dents, cracks and other defects.
4 lubricating oil or grease lubrication, to be replaced or added, but not too much, one third to one half of a lubricating oil, grease third.
Three case study
Terminal urea depth hydrolysis device as a fertilizer industry wastewater treatment, the core equipment for the hydrolysis pump multi-stage, high-speed, high-temperature, high-pressure equipment. Over the years running unstable, so that urea production has been greatly affected.
Mainly in the short life cycle of bearings, machine vibrations, such as failure. After all the analysis that its bearings are used model is inappropriate, carefully summarize hydrolysis pump characteristics, we decided to use deep groove ball bearings, we have to determine the future development of the bearing the installation and maintenance procedures. strictly enforced. Through the transformation of running in good condition, a substantial increase in operating cycle, strong support for our products high and stable yield of urea.
Summary
At present, China bearing demand more optimistic, such as cars, cars, motorcycles, clicks, household appliances and office automation machinery hosting industry, water, gas and currently ending Shanghai World Expo, we have confirmed our complete set of construction equipment engineering equipment and have a greater demand.
Deep groove ball bearings are widely used to promote the quality of our equipment will be further improved, a strong impetus to the process of modernization of our equipment, as the majority of staff equipment should be higher sense of responsibility and mission to do their work, Chinas equipment manufacturing industry of due diligence.
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