How to prevent wheel bearing raceway quenching crack

 Slewing bearing (wheel bearing) hardened raceways need this procedure, improving by quenching wheel bearing raceway hardness increase

Plus raceway wear, but is easy to produce improper quenching quenching crack, crack in the event, most cases will cause slewing

Bearing scrap, quenching cracks because prevention has important significance. Prevent quenching cracks can grab from the following aspects

.
1, the correct product design
     Design should be based on wheel bearings working conditions, requirements, and the design of the cross-sectional size wheel bearings, the correct selection

Optional materials, structural design, to meet the heat treatment process on turntable bearing structural requirements.
2, reasonable arrangements for process lines
     When slewing bearing materials, structures and technical conditions has been established, the craft personnel to conduct process analysis, to determine a reasonable

Process lines. Proper arrangements for preliminary processing, heat treatment and thermal processing and other processes in the order. This is to prevent back after treatment

Turn the main support rail cracking tendency effective way.
3, the choice of quenching medium
     Quenching medium selection should consider the following factors:
    (1) slewing characteristics: Chemical composition of steel (phase change characteristics) of the workpiece cross-sectional size, geometry, surface

Roughness and surface condition of the arrangement of the quenching roller and the density and other conditions.
    (2) quenching methods include: quenching bath, stirring speed, flow, concentration of the solution.
4, choose a reasonable quenching method
     According to the structure and characteristics of wheel bearings, technical requirements, structural design conditions, the quality of workers and other reasonable choice for quenching correct

Fire ways you can greatly reduce or quench cracking incidents do not occur.
5, the right to determine the heating parameters
     Slewing the track on heat treatment, the heating is caused by improper quench cracking slewing ring raceway of the main factors.

Thus, the heating medium, heating rate, heating temperature and heating holding time parameters should be the correct choice and design.
   6, other measures to prevent the quenching cracks