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Sino&Germany (Z&D) tells you factors affecting bearings and their control

Release Time : 2024/01/15 Read：

The early form of rolling bearings is mainly: rupture, plastic deformation, wear, corrosion, fatigue under normal conditions, mainly contact fatigue, mainly internal influencing factors: hardness, strength, toughness, abrasion resistance, resistance, internal stress state ( Except for service conditions)

1. Matrier in quenching steel

High -carbon chromium steel original tissue: granular pearl light body

Extracting + low temperature recovery: carbon content in the quenching horse austency M, which significantly affects the mechanical properties of steel

GCR15 steel quenching M carbon content is 0.5 % to 0.56 % of the comprehensive mechanical properties with the strongest loss ability.

M: Cultivation of the martensite, the measured carbon content is the average carbon content.

2. The residue in the quenching steel

After the normal quenching of high -carbon chromium, it can contain 8 % to 20 % AR (residual Aolinth).

The AR in the bearing parts is beneficial and disadvantages, and the AR content should be appropriate.

AR % ↑ Hardness and exposure fatigue life will increase. After reaching the peak value, the favorable effect of AR must be under the stability of AR. If it is spontaneously transformed into a mate, it will reduce the toughness of the steel sharply sharply. And crisp.

The bearing is too small: AR has a small amount of deformation, which not only reduces the stress peak, but also enhances the deforming AR processing and stress strain to induce Matsenia to change. When the loading is large: AR's larger plastic deformation and the matrix will be cracked by local stress concentration, thereby reducing life span

3. Undolved carbide in quenching steel

The quantity, appearance, size, size, and distribution of the chemical composition of the steel in the quenching steel and the influence of the original tissue before quenching are affected by the Austrian body.

During the load, (especially the carbides are non -spherical) and the substrate causes stress concentration to produce cracks, which will reduce toughness and fatigue resistance.

The performance of the quenching unelding carbonizer affects steel

It affects the carbon content and AR content and distribution of the quenching horse austency, which has an additional effect on the performance of steel.

Exercise unreadal carbonizes are harmful to the comprehensive mechanical properties and failure resistance of steel.

After the bearing steel is quenched, a small amount of unsolved carbonizes are necessary abrasion resistance to obtain fine crystal hidden crystal martensite requires less uncover carbonized (small quantity), small (small size), and uniform (the size difference between the size is very small, and the difference between each other is small. And distributed), round (each carbonizer is spherical).

Properly reducing the carbon content of bearing steel is one of the ways to improve the service life of the parts.

4. Remnant stress after quenching and recovery

After the bearing parts have been quenched at the low temperature, they still have a large internal stress.

The surface residual pressure stress increases, and the fatigue intensity increases (excessive residual stress may cause deformation of parts) Surface residual internal stress to stress, reduce the fatigue strength.

5. The impurities of steel

Impurities: Non -metal miscellaneous harmful elements (acid -soluble), if the oxygen content, the more oxides, the more impurities in the steel in the steel on the ability of mechanical properties and the ability of the parts. The shape of the shape usually has the role of reducing toughness, plasticity, and fatigue life. For bearing parts working under high stress, the exception of oxygen content for manufacturing steel must be reduced: MNS miscellaneous materials in steel can be wrapped in the shape of the shape and harm to the harm. Large oxides are mixed with less effects on fatigue life and may even be beneficial.