Key points for selecting thin-walled bearings

　In order to obtain the low friction torque, high rigidity and good rotation accuracy of thin-walled bearings, small outer diameter steel balls and hollow shafts are used to ensure light weight and wiring space. Thin-walled bearings achieve a thin bearing cross-section and also achieve miniaturization and lightweight of the product. The diversity of products expands its application range.

Main reasons for heat treatment deformation of thin-walled bearings:

　　One of the main reasons for the deformation of thin-walled bearings is the uneven expansion and contraction of the bearing surface and interior during heat treatment and cooling, as well as the thermal stress and large microstructural stress caused by different microstructural transformations. When the ring undergoes overall plastic deformation, the deformation manifests as expansion or contraction in the diameter direction; when local plastic deformation occurs, the roundness or cylindricity error becomes larger. Due to the fast cooling rate of the quenching oil, which far exceeds the heating rate of the ring in the heating furnace, and the poor stiffness of the thin-walled bearing ring, most of the deformation occurs during the cooling process.

　　The original heat treatment process of thin-walled bearings is: quenching temperature 855. Heating time 30min quenching oil temperature is 100. After a set of lathes, add appropriate stress relief annealing; in the quenching stage, properly control the quenching heating temperature, and reasonably control the quenching cooling rate; before quenching, use water glass, asbestos rope or refractory clay to block the oil circuit; heating in a protective atmosphere can reduce oil tank cracking. Improving the structure or shape of the oil tank to avoid straight oil tank and trumpet effect will also play a role in controlling oil tank cracks.

　　Whether the thin-walled bearing is selected correctly, it will have good working performance and extend the service life of the main machine. It plays a very important role in shortening maintenance time, reducing maintenance costs and improving machine operation rate. Therefore, both the design and manufacturing units and the maintenance and use units must attach great importance to the selection of thin-walled bearings.

　　Generally speaking, the steps for selecting thin-walled bearings can be summarized as follows:

　　2. According to the working conditions, stress conditions and service life requirements of thin-walled bearings, determine the bearing type through calculation, or select the bearing type according to the use requirements, and then check the service life;

　　3. Check the load rating of the selected bearing. The main factors to consider in selecting a thin-wall bearing are the required life and load capacity. Other factors help determine the type, construction, size, tolerance level and clearance requirements of the thin-wall bearing.