Plastic plain bearings Plastic plain bearings wear depends on the wear resistance of the material itself, but wear the following factors are also closely related to plastic plain bearings: The grinding shaft material, hardness, roughness, bearing running speed, load and ambient temperature , humidity and so on; as a manufacturer of plastic sliding bearings, it is constantly optimized wear plastic bearing material and to provide users with the correct selection of guidance; and as the user to follow the plastic sliding bearings manufacturer Product Manual for plastic plain bearing selection and assembly instructions.

The most critical moment any bearing is the startup phase. In this case, the lubricating film is not formed and the bearing to work, this is the most common case. As long as a work in load bearing, bearing it will have slight wear. In the start-up phase, when the fine wear more fully, it will use the outer surface of these tiny wear particles filling the shaft, and therefore low wear work can produce optimal lubricating film. After starting, minor wear decreased rapidly, these changes have little effect on the size. After continuous start-up phase, the wear rate is small and stable.

Any type of plastic plain bearings have mated for the best working conditions, such as the best fit of the shaft material, roughness; optimum working pressure, speed, temperature and the like; for CSB-EP series of plastic sliding bearings Best with the shaft material is plated with hard chrome surface; roughness on the CSB plastic plain bearings for shaft roughness of each model is different, we can see from Figure 3 CSB plastic plain bearings for shaft roughness from Ra0. 1 to Ra1.6; while the CSB-EP5 plastic plain bearings for optimum temperature is not at room temperature, EP5 manifested at a temperature of 160 ℃ friction and wear properties of the best.

CSB Research laboratory test constantly imitate working conditions found in the form of the occurrence of plastic sliding bearings wear at work are the following:

Normal wear - wear bearing occurs under the right conditions with; wear mainly the result of the work this time bearing the initial stage bearing the lubricating substance to the surface of the shaft, while the transfer, when the ideal of the establishment of a sub-bearing lubrication the wear rate is slowly reduced.

Crawling wear - since the shaft surface roughness caused by friction surface is too smooth crawling; shaft surface is too smooth, plastic plain bearings in the lubricating substance can not be transferred to the lubricating film is filled pits formed in the surface of the shaft so that friction can not be established ideal; this bearing friction coefficient increases, also increases the driving force required;

Plowing wear - too rough result since the shaft friction surface scratching furrows phenomenon; shaft surface height difference is too large, the transfer from the bearing surface to form a solid lubricating substances can not ideal smooth surface friction; wear occurs at this time of the essence is abrasion and scratch resistance;

Wear glued - glued bearing safety reasons beyond the operating temperature or optical axis caused; axis adsorption wear has occurred in local softening of friction bearing surface formed at the bearing operating temperature exceeds the permissible safe operating temperature.

Burns wear - running too fast due to the friction surface wear and tear caused by burns; cause shaft bearings run faster than the allowed speed due to friction when friction heat generated from a sharp rise in friction surface, a sharp rise in the frictional heat of friction surface burns fast.

Of course, the plastic slide bearing wear occurs is unavoidable phenomenon, in the case of the plastic slide bearing performance has been established, we can use as much as possible to follow the rules for each of the different types of bearings, plastic bearing wear to a minimum, thereby The plastic bearing play to the best performance.

"Chinese bearing manufacturing industry production demand forecasting and upgrade analysis" data, 2009 - 2013 total industrial output value of China's bearing manufacturing industry increasing year by year trend. 2013 industrial output value of 249.363 billion yuan business, an increase of 12.92%.

Nearly five years of data analysis found, 2009 - 2013 sales revenue of China's bearing manufacturing industry also showed a rising trend. 2013, sales revenue 249.012 billion yuan, an increase of 11.80%.

The rapid development of China's bearing industry, bearing varieties from less to more, product quality and technical level from low to high, from small to large scale industries, has formed a complete product categories, basic, production layout reasonable professional production system.

Life

Under certain load, the number of revolutions or hours before the experience of pitting bearing, which is called the bearing life.

Life of rolling bearings of the number of revolutions (or in hours of work at a certain speed) Definition: In this life bearing within, should occur initial fatigue damage (flaking or chipping) on any of the bearing ring or rolling elements. However, both in laboratory tests or in actual use, we can clearly see the appearance in the same working conditions identical bearing, the actual life different. There are also several different definitions of the bearing "life", one of the so-called "working life", which represents the actual life of a bearing can be achieved before the damage is usually not damaged by the wear caused by fatigue, but It is caused by wear and tear, corrosion, seal damage and other reasons.

Criteria for determining bearing life, bearing life and reliability of the link.

Due to manufacturing precision, uniformity of material differences, even in the same material, the same group of the same size bearings, used under the same operating conditions, their life is not the same length. In terms of the statistical life expectancy of the unit 1, the longest life of 4 relative units, the shortest 0.1-0.2 units, the ratio of the longest and the shortest life of 20-40 times. 90% of the bearing does not produce pitting, the number of revolutions or the number of hours after which called bearing rating life.

Dynamic load rating

To compare the bearing pitting carrying capacity, the provisions of the bearing rating life of one million revolutions (106), the maximum load can withstand the basic dynamic load rating, represented by C.

That is the dynamic load bearing rated C in under a million revolutions that the bearing (106) without the risk of pitting failure reliability of 90%, higher C greater carrying capacity.

For the basic dynamic load rating

1. Radial bearing load refers to pure radial

2. Thrust ball bearings refers to pure axial load

3. Radial thrust bearing means to produce pure radial displacement have radial component

Modern machinery and equipment bearing is an important component. Its main function is to support the mechanical rotating body, reducing the coefficient of friction during movement, and to ensure the accuracy of its rotation.

Friction of moving parts of different nature, Rolling bearings and plain bearings can be divided into two categories. Wherein Rolling been standardized, serialized, but compared with the sliding bearing its radial dimension, vibration and noise is large, the price is higher.

Rolling generally consists of an outer ring, inner ring, rolling elements and cage four parts. According to the shape of the rolling elements, bearing into ball bearings and roller bearings into two categories.