High-end bearings drive rapid development of machinery manufacturing

wallpapers Industry 2020-03-30

Bearings are key components within the equipment and equipment manufacturing enterprise, which directly decide the performance, excellent, and reliability of the major system and mainframe merchandise. Self-lubricating bearings seem because of the "Pearl in the Crown of manufacturing enterprise" by way of the enterprise.

Plain bearing

Sliding bearing: A bearing that works under sliding friction. Sliding bearings work smoothly, reliably, and without noise. Underneath the condition of liquid lubrication, the sliding floor is separated with the aid of the lubricating oil without direct touch. It could additionally substantially lessen friction loss and floor put on. The oil film additionally has a certain capability to soak up the vibration, but the starting friction resistance is huge.

The part of the shaft supported through the bearing is called the journal, and the component matching the journal is called the bearing bush. That allows you to enhance the friction houses of the bearing pad surface, a layer of friction-reducing material cast on its internal floor is referred to as a bearing bush. The materials of bearing pads and bearing timber are together referred to as plain bearing substances. Sliding bearing packages are usually underneath low-speed, and heavy-load situations, or in places wherein preservation and lubrication are difficult.

Sliding bearings can be divided into radial (radial) sliding bearings and thrust (axial) sliding bearings according to the direction of bearing load.

Radial plain bearing

undeniable bearings that aid radial hundreds. The part of the shaft supported through the bearing is called the magazine, and the component matching the magazine is referred to as the bearing bush. The whole cylindrical bearing is referred to as the sleeve. The upper part is referred to as the bearing cover. Half of it is known as the bearing seat. The cover and the seat are linked by using studs, and the joint floor of the two is located through a stop or a pin. Spacers of various thicknesses may be placed to adjust the bearing clearance.

Thrust plain bearing

Thrust bearings whose two friction surfaces are completely separated by a fluid film are divided into hydrodynamic thrust bearings and hydrostatic thrust bearings, which are suitable for high to medium speed operation. Thrust bearings whose two friction surfaces cannot be completely separated by a fluid film work under boundary lubrication and are only suitable for low-speed operation.

Rolling bearing

The rolling bearing is a unique mechanical detail that adjustments the sliding friction among the walking shaft and the shaft seat into rolling friction, thereby reducing friction losses. Rolling bearings are normally composed of four elements: inner ring, outer ring, rolling frame, and cage.

The role of the inner ring is to cooperate with the shaft and rotate with the shaft; the role of the outer ring is to cooperate with the bearing seat to support; the rolling elements are evenly distributed between the inner and outer rings by the cage, Its shape and size directly affect the performance and life of rolling bearings; the cage can evenly distribute the rolling elements, prevent the rolling elements from falling off, and guide the rolling elements to perform lubrication.

Code of rolling bearing

GB / T272-93 stipulates the composition and expression method of rolling bearing code. The rolling bearing code is composed of a front code, a basic code, and a postcode, which represent the content and the order of arrangement.

Type selection of rolling bearing

the size, path, and nature of the weight on the bearing are the principal foundation for selecting the form of bearing.

(1) Load length and nature: Ball bearings have to be used for mild and medium masses; roller bearings have to be used for heavy or surprise loads.

(2) Load route: For natural radial load, deep groove ball bearings, cylindrical curler bearings or needle curler bearings can be decided on. For natural axial load, thrust bearings are non-compulsory. Whilst there may be each radial load and axial load, if the axial load is not too big, deep groove ball bearings or angular touch ball bearings and tapered curler bearings with smaller contact angles can be decided on; if the axial load is big, the two sorts of bearings with large contact angles can be used. If the axial load is massive and the radial load is small, thrust angular touch bearings may be used. The guide structure of radial bearings and thrust bearings also can be used.

Calculation guidelines for rolling bearings

When determining the size of the bearing, the necessary calculations shall be made for the main form of bearing failure. For bearings in general operation, the main failure form is fatigue pitting, and the life calculation should be based on the basic dynamic load rating. For bearings that do not rotate, swing, or have extremely low speed (n≤10 r / min), the main failure form is plastic deformation, so the strength calculation should be performed according to the rated static load.

Precautions forbearing use

Bearing lubrication

Lubricants must be selected according to the season and region. Lubricating oil (grease) should be filled regularly. The quantity and quality of the lubricating oil in the oil bath or oil tank of the pressure lubrication system should be checked, supplemented, and replaced in time. The pressure lubrication system should be adequately supplied with oil. If the oil pressure is abnormal, it should be checked and treated in time.

Working condition of the bearing

Bearing damage is mainly identified by abnormal working conditions. Unstable running and abnormal running noise may be caused by excessive wear of the sliding bearing, melting of the alloy, falling off of the alloy, or wear of the rolling bearing rolling surface, resulting in excessive radial clearance. Heavy operation and abnormal temperature rise may cause dry friction due to the sliding bearing alloy shedding, alloy scratches, poor contact between the bearing pad and the bearing seat, or the rolling surface of the rolling bearing being damaged. Such as metal peeling, cracking, ablation (that is, high-temperature annealing, the color is purple-black), too tight bearings and poor lubrication, etc., should be inspected in a timely manner.

Check bearing integrity

When performing regular maintenance on the machine, carefully check the integrity of the bearings. If the bearing bush is damaged or the clearance exceeds the allowable limit, it should be repaired again. The rolling bearing is damaged and loose and should be replaced. The oil circuit of the lubrication system should be cleaned and unblocked.

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