Precision and Dimension Control of Engineering Machinery Bearing Sleeves

Engineering machinery bearing sleeves are widely used mechanical components in the field of engineering machinery, mainly used to support and fix bearings. The machining quality and dimensional control of bearing sleeves directly affect the performance and service life of bearings. Therefore, it is necessary to strictly control the precision and size during the machining process to ensure the quality of the bearing sleeve.

I. Precision Control

The precision of the bearing sleeve is affected by many factors, including machining equipment, processing methods, and materials. Common precision grades of bearing sleeves include IT7, IT8, IT9, etc. The specific precision control should select different processing techniques according to the use environment and bearing variety to meet the precision requirements of the bearing sleeve.

When machining the bearing sleeve, the following aspects should be paid attention to:

1. Ensure that the roundness and straightness of the bearing sleeve meet the requirements;
2. Ensure the surface finish and surface hardness of the bearing sleeve;
3. Ensure that the cylindricity and flatness of the bearing sleeve meet the requirements.

II. Dimension Control

Dimensional control of bearing sleeves should first ensure that they meet the design requirements. The dimension control of bearing sleeves mainly includes inner diameter, outer diameter, roundness error, and end face error. When machining the bearing sleeve, appropriate processing technology and methods should be adopted to ensure dimensional control accuracy.

Specifically, the following aspects should be controlled:

1. The machining of the inner diameter and outer diameter should maintain a certain proportion to prevent excessive or too small errors;
2. On the bearing sleeve after outer grinding, identify the roundness error through optical instruments, and adjust it promptly during the processing;
3. The displacement increment of contact between the tool and the workpiece should be well controlled, to prevent excessive or surplus errors;
4. Check the perpendicularity of the end face and ensure that the perpendicularity error is within plus or minus 1/1000;

In terms of dimensional control, appropriate precision testing instruments should be selected according to the actual process, to ensure the dimensional control accuracy of the bearing sleeve, and take correct disposal measures.

Overall, the precision and dimension control of bearing sleeves are related to the performance and service life of the bearings. During machining and testing, corresponding standards and requirements should be strictly implemented, attention should be paid to details, to ensure the machining quality of bearing sleeves.