The use of plastic in rolling bearings (2)

Source: China Bearing Network Time: 2017-12-19

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The cage is an important part of the rolling bearing. It is not only subject to mechanical stresses such as conflicting forces, tension and inertial forces; it is also subject to certain smoothing agents, smoothing additives or their aging products, organic solvents or coolants. The chemical effects; their degree of influence can also be affected by factors such as high temperature, shock, oscillation, radiation and their combination of elements.
The function of the cage data and the reliability of operation are one of the key factors to ensure the normal operation of the bearing. The polymer data holder can complete the perfect connection between strength and elasticity; it has excellent sliding function on the smooth steel surface; extremely low conflict Force; then keep the wear and heat of the bearing at the lowest level. The inertia of the low-density data is low; even in the absence of smoothing agents; the plastic cage still has excellent running function; therefore, the bearing does not even work in succession. There is a danger of jamming and secondary damage.
The plastic cage can accommodate a larger number of larger scale rolls under the same dimensions and cross-section conditions; then improve the bearing capacity of the bearing; in addition to the smoothing agent to improve smooth conditions, reduce oscillation, self-adjusting habits and save Data and advanced production power have significant advantages. The current material for plastic cages is glass fiber reinforced nylon 66; glass fiber content is 25%-30%. Follow the development of engineering plastics modification skills and the presentation of new materials; Will further expand the use of plastic in the bearing cage.
The use of plastics in tumbling bearings to further widen the wide use of plastics in bearing cages has highlighted the superiority of plastics in tumbling bearings. With the development of modern technology; the successful development of new plastic materials and the extension of the scale of use; The use of plastic in rolling bearings further expands the space.
1), the plastic for the bearing cage has been from PA66/GF; gradually use PTFE, PTFE/GF, PEI, PVDF, PEEK/GF, PEEK/CF, PPS, PI, UHMWPE and other materials; Requirements. For example, PTFE and PVDF are mainly used in working conditions with corrosion resistance requirements. UHMWPE has good strength, low conflict and low temperature use characteristics (minimum to -150 Â° C); PEEK/GF or CF is mainly used for High temperature, radiation resistance, low conflict and other working conditions.
2) The inner and outer rings have been made of plastic. There are many varieties; the use is different.
For example: POM or PA for inner and outer rings; PA66/GF (wt25%) for cages; glass, stainless steel or ceramic for rolling elements (primarily zirconia ZrO2, silicon nitride Si3N4, silicon carbide SiC). Outstanding in an alkaline environment; but not in an acid corrosive environment.
HDPE, PP or UHMWPE for inner and outer rings; bearings for HDPE, PP or UHMWPE for cages; for relatively weak acid-base alternating environments (tested with 30% CuCL2 solution and 30% NaOH solution); applicable to large Most acids/bases/salts/solvents/oil/gas and seawater corrosive environments.

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