Precision Bearings-Luoyang Rockewell Precision Bearing Co.,Ltd

Precision Bearings

Flexible Bearings

Features of Flexible bearings：Flexible bearings are mainly subjected to alternating stress. Due to their relatively thin wall thickness, certain ...

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High-speed Servo Motor Bearings

Good airtightness, high stability, preferred metal material, after special heat treatment process, manufacturing equipment and technology.

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Flange Type Screw Bearing

FL760/P4 DBBseries：Flanged screw bearing has a compact structure, small volume, two-way force, low vibration, low noise, high rotation accuracy, low ...

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Screw Bearing

Screw bearings are used in machine tool lead screws. They have good running support performance, quiet and energy saving, high wear resistance, long life, low replacement rate, high guiding accuracy, and various models and sizes.

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Cylindrical Roller Bearings

The roller and raceway of cylindrical roller bearings are in line contact or repaired offline contact, with large radial load capacity, suitable for bearing heavy loads and impact loads.

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Thin-walled Bearings

The thin-walled bearing realizes the extremely thin bearing section, and also realizes the miniaturization and light weight of the product. The variety of products expands its scope of use.

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Cross Roller Bearing

Crossed roller bearing is a special type bearing with split inner ring and rotating outer ring. Since the divided inner ring or outer ring is installed with rollers and spacers, it is fixed with the cross roller ring to prevent separation from each other, so it is easy to operate when installing the cross roller ring.

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Spindle Bearings

Spindle Bearings Introduction：LYLKWE spindle bearings is made of high-quality steel and after quenching and tempering, it has high hardness and ...

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Machine Tool Bearings

Machine Tool Bearings Introduction：The machine tool bearings produced by LYLKWE have high precision, high-speed performance, high temperature ...

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Tandem Thrust Cylindrical Roller Bearings

Features：Tandem thrust cylindrical roller bearings have small radial interface size, compact structure, large axial load capacity, uniform load on ...

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Precision Bearing Heat Treatment Process

Preliminary heat treatment:

Normalizing

Normalizing, also known as normalization, is to heat the workpiece to Ac3 (Ac refers to the final temperature at which all free ferrite is transformed into austenite during heating, generally from 727°C to 912°C) or Acm (Acm is the critical temperature line for the complete austenitization of hypereutectoid steel in actual heating) 30~50℃ above, after holding for a period of time, take it out of the furnace and cool the metal in air or by spraying water, spraying or blowing. Craft. Its purpose is to make the grain refinement and carbide distribution uniform. Parameters: The normalizing temperature of different components is slightly different.

Spheroidizing Annealing

Its main purpose is to reduce hardness, improve machinability, and prepare for quenching in the future. This process is conducive to plastic processing and cutting, and can also improve mechanical toughness.

Final heat treatment:

Quenching

Quenching is to heat up the raw material to the austenitizing temperature and keep it for a period of time as needed. Then it is cooled quickly to obtain a structure with higher hardness and strength than the original, so as to enhance the mechanical properties of the material and increase the durability of the material. For example, 45 steel, the original structure is ferrite + pearlite, martensite is obtained after quenching, and the strength and hardness are doubled.

Cold Treatment

Cold treatment: the retained austenite that has not been fully transformed during the quenching process will continue to transform to martensite. In addition to improving the dimensional stability of the parts, it can also slightly improve the hardness and rust resistance of the parts. But it will reduce the toughness of bearing steel. Sometimes, the principle that the martensite is larger than the volume can be used to save the scrapped products due to size reduction with cold treatment.

Tempering

Parts must be tempered after quenching (or cold treatment). Tempering can reduce and stabilize the residual stress, stabilize the structure, avoid cracks and deformation, appropriately reduce the hardness and greatly increase the toughness, so that the parts can finally obtain the best fit, comprehensive toughness and mechanical properties and dimensional stability.

Additional tempering (stabilization treatment)

The role of additional tempering is to eliminate the grinding stress and further stabilize the structure in order to improve the dimensional stability of the parts.