Bearing Installation and Storage

Time：2020.10.26  Source：Roller Bearings Suppliers

Whether the bearing is installed correctly affects accuracy, life and performance. Therefore, the design and assembly department must fully study the bearing installation. Hope to install in accordance with operating standards. The standard operation items are usually as follows:

(1) Clean the bearing and its related parts

(2) Check the size and finishing of related parts

(3) Installation

(4) Inspection after bearing installation

(5) Supply lubricant

It is hoped that the bearing package will be opened just before installation. General grease lubrication, do not clean, directly fill with grease. Lubricating oil is lubricated, and cleaning is not usually necessary. However, the bearings for instruments or high-speed applications should be cleaned with clean oil to remove the anti-rust agent coated on the bearings. Bearings without rust inhibitor are easy to rust, so they should not be left alone.In addition, bearings that have been packed with grease can be used directly without cleaning. The installation method of the bearing varies with the bearing structure, fit and conditions. Generally, since most of the shaft rotates, the inner ring needs an interference fit. Bearings with cylindrical bores are usually pressed in with a press or hot-fitting method. In the case of a tapered hole, install it directly on the tapered shaft or use a sleeve.  WSBC 23036 CC/W33 bearings online , today share bearing photo : 

When installing to the shell, generally there is a lot of clearance fit and the outer ring has an interference. It is usually pressed in with a press, or there is also a shrink fit method for installation after cooling. When dry ice is used as the coolant, the moisture in the air will condense on the surface of the bearing when the shrink fit is installed. Therefore, appropriate anti-rust measures are required.

2. Bearing material

The rings and rolling elements of rolling bearings bear high contact pressure repeatedly while making rolling contact accompanied by sliding. The cage is in sliding contact with both sides of the ring and rolling elements or one side, and bears the tensile and compressive forces on the other. Therefore, the main requirements for the materials and performance of bearing rings, rolling elements and cages are as follows:

(1) The required properties of ferrule and rolling element materials: high rolling fatigue strength, high hardness and high wear resistance;

(2) The required performance of the cage material: good dimensional stability and high mechanical strength.

(3) Good workability is required. According to different uses, it is also required to have good impact resistance, heat resistance, and corrosion resistance.

Material of rings and rolling elements

Rings and rolling elements usually use high-carbon chromium bearing steel. Most of the bearings use SUJ2 in JIS steel grade. SUJ3 is used for large bearings. The chemical composition of SUJ2 has been standardized as a bearing material in countries around the world. For example: AISL52100 (USA), DIN100Cr6 (West Germany), BS535A99 (UK), etc. are all of the same kind of steel. WSBC 23040 CC/W33 bearings online , today share bearing photo : 

When further impact resistance is required, chromium steel, chromium-molybdenum steel, nickel-chromium-molybdenum steel is used as the bearing material, and carburizing and quenching are used to make the steel have a hardened layer from the surface to an appropriate depth. Carburized bearings with proper hardening depth, fine structure, proper hardness of surface and core hardness have better impact resistance than bearings using bearing steel, and the chemical composition of general carburized bearing steel. WSBC has implemented vacuum degassing treatment, so the materials used have high purity, low oxygen content and good quality.

Furthermore, proper heat treatment is adopted to significantly increase the rolling fatigue life of the bearing. In addition to the above-mentioned steel grades, high-speed steel with excellent heat resistance and stainless steel with good corrosion resistance are also used for special purposes.

Cage material

The material of the stamping cage is low carbon steel. Depending on the application, brass plates and stainless steel plates are also used. The material for cutting the cage is made of high-strength brass, carbon steel, and synthetic resin.

3. Storage of bearings

The storage of bearings must first fully consider the size and weight of the stored bearings, and secondly, consider the necessary handling space and equipment to ensure that the bearings will not collide during storage and retrieval. Do not place the bearing directly on the ground.

Therefore, it is necessary to configure a proper shelf, and the bottom of the shelf should be 30cm above the ground. In the general packaging state, the rust prevention effect is 13 years depending on the storage environment. In special circumstances that require storage for nearly 10 years, the storage method can be immersed in oil such as turbine oil (as bearing lubricant).

 Installation of bearings

There are many ways to install the bearing, and the same work will be done after installation. After the bearing is installed, the outer ring must be obliquely coated with bearing lubricant.