The development of my country's miniature bearing market
The development of my country's miniature bearing market
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The harm of FAG bearing metamorphic layer is outlined
by：Waxing
2020-11-17
1, cold plastic deformation layer: in the process of grinding, every moment of abrasive is equivalent to a cutting edge.
But in many cases, the rake Angle of cutting edge negative, in addition to abrasive cutting action, is to make the workpiece surface under compression (
The plough)
That left obvious plastic deformation of workpiece surface layer.
The deformation layer deformation degree as the degree of grinding wheel dull increases and grinding feed.
2, thermoplastic deformation layer: the grinding heat in the transient temperature of the work surface formation, makes a certain depth of the workpiece surface layer elastic limit fell sharply, even to the point of elastic disappear.
The work surface on the grinding force, especially under the action of compression force and friction force, caused by free stretch, subject to the conditions of the matrix metal, the surface is compressed (
More plough)
, cause the plastic deformation in the surface layer.
High temperature plastic deformation under the condition of the grinding process is constant, with the temperature increasing of workpiece surface.
3, work hardening layer: sometimes use micro hardness and metallographic method can be found that caused by the machining deformation of surface hardness.
In addition, in addition to grinding, casting and heat treatment heating caused by the surface decarburized layer, if in the later processing has not been completely removed, residual softening metamorphism on the workpiece surface can cause surface, lead to premature failure of the bearing.
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