Each series of spherical bearings, due to their different designs have different characteristics, making it suitable for a particular application. For example, the small and medium-sized deep groove ball bearings can withstand radial and axial loads, low friction operation, you can create high-accuracy and low-noise products, and therefore suitable for small or medium-sized motor timken bearings can withstand extremely heavy loads, and The self-aligning. These features make it suitable for engineering applications, because these applications in a very heavy load, heavy load will cause deformation, do not mind.
The spherical bearing parts, can be observed the rough interface microstructure overheating after quenching. But must observe the microstructure accurately determine the degree of overheating. Hardened GCr15 steel the coarse acicular martensitic hardening heat organizations. Formation may be caused by overheating due to the quenching temperature is too high or heating whole holding time is too long, it may be due to the original organization links are formed between the two areas with carbon martensitic needle localization thick carbide severe, causing local overheating. The overheating organization retained austenite increased dimensional stability decreased. Due to crystal thickness of the heat hardened steel will lead to decline in the toughness, impact resistance, and reduced in some areas, and outer spherical bearing decrease in the life. Overheating may result in serious or even quenching cracks.
The spherical bearing parts in the heat treatment process, thermal stress and the presence of stress, this stress can be superimposed or partially cancel each other, is a complex, since its heating temperature, heating rate, cooling, cooling rate, part of the shape and size changes Therefore, the thermal deformation is inevitable. Understand and master the changes of its components, and the spherical bearing deformation (eg, oval ring, size up large, etc.) in the control range, conducive to the production. Of course, in the mechanical parts of the heat treatment will affect the deformation, but this distortion can be reduced by improving the operation and avoid.
The outer spherical bearing part during the heat treatment, if it is heated in an oxidizing medium, surface oxidation will occur, so that the decrease in the carbon mass fraction of the surface of the part, causing surface decarburization. Surface decarburized layer deeper than the final disposal of the remaining amount of the parts scrapped. Surface decarburized layer depth, measured in metallographic examination and hardness metallographic method. The surface layer microhardness the curve measurements topics do arbitration standards.
Other News:
Fever handling different types of spherical bearing
Thrust ball bearings thrust ball water solution
To prevent bearings burns points to note
Maintenance way to prevent high burn of angular contact ball bearings
Analysis of thrust ball bearings tie in with the operation of the detection technology
Analysis Spherical roller bearings routine examination preparatory work
Excluded from several aspects of the bearing temperature is too high to start
Improve transport quality of installation of bearing adjustment
