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Analysis of the Factors Affecting the Circularness of the Inner Ring of Rolling Bearings

Source: China Bearing Network Time: 2014-02-23

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1. The circularity of the inner ring of the rolling bearing is an important quality index; it directly affects the accuracy, stability and service life of the bearing. Grinding is generally the semi-finishing or finishing process of the inner ring channel; The roundness of the track plays a decisive role; the roundness of the inner ring channel grinding is not only dependent on the precision and dynamic characteristics of the grinding process system; it is also closely related to the grinding process parameters. The former; has been the focus of many experts; And carried out a lot of research; then greatly improved the roundness of the inner ring of the grinding inner ring. Following the improvement of the precision of the grinding process system and the improvement of the dynamic characteristics; the grinding process parameters became the primary factor affecting the roundness; The rules for the influence of the cutting process parameters on the roundness; the reasonable selection of the process parameters; the roundness of the grinding of the bearing channel; and the optimization of the process parameters for grinding the bearing channel; it is of great significance.
2. The inner ring of the bearing is generally selected by the variable feed rate cutting and grinding method; the grinding cycle can be divided into four parts: the workpiece speed approach, coarse feed, fine feed and no feed grinding. The primary elements of the bearing channel roundness can be summarized as: (1) the accuracy of the process system in the grinding process; this depends on the accuracy of the grinding machine and the positioning principle of the fixture, layout parameters and accuracy: (2) the dynamic characteristics of the process system; In particular, the balance of the grinding wheel: during the dressing and grinding process; the grinding wheel is unbalanced; it will cause forced oscillation; the relative orientation of the dresser and the grinding wheel when trimming the grinding wheel and the relative orientation of the workpiece and the grinding wheel during grinding; In different cases, the stiffness of the process system is different, so that the surface of the workpiece that is oscillated to form a grinding is not round: the grinding process parameters affect the touch stiffness of the grinding wheel and the workpiece, the wear process of the grinding wheel and the damping characteristics of the oscillation of the process system; Affects the oscillation characteristics of the grinding process; the end is reflected in the shape of the grinding workpiece (ie roundness) and other appearance quality: (3) caused by the elastic deformation of the process system The original error re-recording: It can be known that several shape error correction rules of the grinding cycle workpiece can be known; the repeated shape error of the workpiece after grinding depends on the rigidity of the process system, the grinding process parameters, the wear speed of the grinding wheel and the original error of the workpiece. Think about the above factors; when the process system stiffness and dynamic characteristics are punctual (especially the grinding wheel needs to pass an outstanding balance); the roundness error of the grinding workpiece depends mainly on the grinding process parameters; thus it can be tested by grinding roundness Gradual regression modeling of data; selecting important parameters from multiple process parameters; gradually introducing regression equations; then establishing the optimal regression equation for the relationship between grinding roundness and process parameters.
3. The machine wheel oscillation caused by the imbalance of the grinding wheel or other factors; it will seriously affect the roundness of the grinding workpiece. It insists on the outstanding working condition of the machine tool and the outstanding balance of the grinding wheel; it is the precondition for the application of the roundness mathematical model fitted above. In addition; The hardness and arrangement of the grinding wheel and the grain size and abrasive type are different; there are also different coolant components; it will have a certain influence on the roundness of grinding.

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