Application of plastic in rolling bearings (3)

Source: China Bearing Network Time: 2017-10-02

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The inner and outer rings are also made of PEEK/CF, PEEK/GF, PI, PPS, etc. The POM or PEEK is used for the inner and outer rings; the plastic bearing with the frame is PA66 or PA66/GF or PEEK; its accuracy and public service It is much more advanced than the usual plastic bearings; it can be used in precision machinery, special working conditions and high speed requirements.
3) The current roll material is basically made of stainless steel; the ceramic and glass roll are also available. These years have presented the roll body made of PEEK and PI.
The primary raw material for bearings is SiC
4) The current roll data is basically made of stainless steel; the ceramic and glass roll are also available. These years have presented the roll body made of PEEK and PI.
The development of plastics; it provides strong technical support for its use in bearings; plastic bearings are developed very quickly; the scale of application is also extensive; this is first of all thanks to the development of plastics. According to reports; TIMKEN Bearing Company of the United States has developed Leading bearing data; this is a new development after the development of plastic bearing materials by NSK Bearings Co., Ltd. and the development of high-performance automotive plastic bearing bearings by SKF Bearing Co., Ltd.. In 2005, Seiko optimized the molecular weight of the original PA, GF diameter and The share of the mixture with GF; the rigidity and tensile strength of the data are improved by 70% and 45% compared with the data used; then the carrying capacity and creep resistance of the data are improved; this is about the function of the progressive bearing. Strong skill support.
In China; the production of raw materials, especially the development and production of special plastics for bearings, started late; there is a large distance from foreign countries. Many types of engineering plastics and special engineering plastics in China still rely mainly on imports; some so-called "strategies" "Materials" is still closed to China; this has restricted the development of China's plastic bearings to a certain extent.
Plastics need to pay attention to the problems in the use of plastics. Many of the functional features of plastics have been widely used in bearings. However, some inherent properties of plastics have to give them plenty of thinking when used in bearings. Such as relatively low strength, poor hardness; thermal expansion coefficient is much larger than metal; low thermal conductivity; poor thermal conductivity; low heat distortion temperature; some plastics have relatively poor acid and alkali resistance; The plastics have poor oil resistance; let's take a look at some of the problems.
Cooperative precision rules the accuracy level of bearings in GB and ISO specifications; in addition to the general accuracy P0 level; there are P6, P5, P4 grades; precision advances; this specification is only applicable to steel bearings and ceramic bearings. For plastic bearings. The accuracy of plastic bearings is relatively low compared to the above two types of bearings.
The setting and manipulation of the clearance value is a very important target for determining the accuracy of the bearing. The value of the internal clearance in the work of the rolling bearing is large. Yunæ·¦@å€œå€œ(17)ç©¸èƒç°Ÿ(10) Laws are read. The clearance value refers to the fixed amount of the inner ring (or outer ring) of the bearing; the amount of movement of the other ferrule moving up and down or left and right. There are relevant rules for the clearance value of steel bearings and ceramic bearings. The outer ring or the inner and outer ring tumbling bodies are all made of plastic; this rule does not apply; this may be due to the poor thermal function of the plastic; the reason for the large clearance value and difficulty in handling.

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