The use of solid-state phase transition, the quenching process is known as surface heat treatment, commonly known as surface hardening on the part of the surface layer by rapid heating method. Including Flame Hardening, (center) frequency induction heating quenching, laser heating or electron beam heating quenching. The characteristics of these methods: surface local heating quenching, deformation of the workpiece is small; heating speed, high production efficiency; heating time is short and very slight surface decarburization.
Plastic deformation occurs through mechanical methods of metal surface layer, thus forming a hardened layer of high hardness and high strength, the surface hardening method is called surface deformation strengthening, also known as work hardening. Including shot peening, sand blasting, cold extrusion, rolling, cold-milled and shock, blast peening. The method is characterized by: strengthening layers increased dislocation density, subgrain structure refinement, making it the hardness and strength, the surface roughness is reduced, can significantly improve the fatigue strength of parts of the surface and reduce the fatigue notch sensitivity. The fortification process is simple, the effect is significant, there are clear boundaries between the hardened layer and the substrate, a coherent structure, not easy to fall off in use. The majority of its approach has been applied in the bearing industry: to strengthen the surface impact of the rolling body is the application of these methods, the precision RCC has become a new ferrule processing and fortification.
fag bearing grease evaporation (degrees) that the grease long-term use in high temperature conditions, the grease oil volatilization of the degree of evaporation as small as possible. Fat evaporation mainly depends on the nature of the lubricating oil and distillate composition.
Oxidation stability of the grease in the resistance to heat and oxygen role in maintaining the long-term storage or long-term high temperature use, by its nature is not permanent change. Often occurs due to the oxidation of the free alkali content of the reduced or free organic acid content increased, decreased drop point, become darker in color appearance, different odor, consistency, ultimate strength, similar to the viscosity decreases to generate corrosion products and the destruction of grease structure substances, soap oil separator.
Therefore, in the long-term storage of the grease should be stored in dry and ventilated environment, prevent sun exposure, and changes in the free base or free organic acids, corrosive and other projects should be checked regularly to ensure its quality and performance.
Check fag bearing, do not let the needle one-way bearings exposed to environmental contaminants or moisture. If the interruption of work should be based on the greaseproof paper of plastic sheeting or similar material to cover once the machine.
Cleaning the exposed needle one-way bearing in the case of without disassembling may perform inspection, cleaning to coating with the brush coated with petroleum solvents (white spirit), and then dry with a lint cloth or compressed air (be careful not to let the fag bearing assemblies starting rotation).
Can not clean the fag bearing encryption cover or dust; wipe the external surface can be. If the needle is one-way bearing was damage to the circumstances that need replacing.
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