Steel Balls are mostly used in precision bearings, bicycle and auto parts, slide rails, recirculating ball screws, pumps, sprayers, milling machines, and other applications.
The surface enhancement (also called pressurization) of the steel ball is within the range of elastoplastic deformation of the surface of the steel ball. The collision of the steel ball causes macro-elastic deformation and micro-plastic deformation of the surface, which increases the hardness of the surface of the steel ball. The improvement is uniform, and the surface is strengthened by compressive stress distribution.
When the ball bearing is working, fatigue cracks are prone to occur at large shear stress depths below the ground surface, and then the micro-cracks propagate to the ground surface under the action of alternating stress, causing fatigue detachment. The steel ball surface strengthening process generates residual compressive stress at a large shear stress depth, eliminates the tensile stress that is conducive to the formation and propagation of microcracks, and converts the tensile stress on the surface of the steel ball into compressive stress, which is improved and improved. Fatigue strength of steel balls. Abrasion resistance. The life of bearings assembled with steel bars has more than doubled.
The surface strengthening method of the steel ball is realized by the surface heat treatment method of the steel ball. The commonly used methods of surface strengthening of steel balls include surface heat treatment and surface mechanical treatment. Heat treatment and pre-quenching change the metallographic structure on the surface of the steel ball to make its distribution more uniform. If the diameter of the steel ball is less than 10mm, the surface hardness can be increased by about 05HRC-2HRC. If the diameter of the steel ball is 10mm, the hardness of the surface material of the steel ball increases by about 15HRC-3HRC. The surface hardness of the steel ball has a very good effect on improving the metal contact fatigue life.