Commonly used bearing ring grinding fixture

When the rolling bearing ring grinding fixture, from to the coreless type centering type development, up to now, has become a kind of standard bearing fancy way. So the first thing we know about the characteristics of centralizer and centerless jig 1. 4. 1 centralizer and centerless jig 1. Characteristics of centralizer if in the process of machining center relative to the workpiece fixture position is fixed, so the fixture is called 'centralizer. Centralizer shortcomings are as follows: (1) fixture on the grinding machine spindle, the spindle axial runout and fixture positioning error itself, completely to machining error. (2) the workpiece clamping deformation, makes the polygon after grinding. (3) fluctuation is not convenient, processing Fan Gu narrow, not easy to realize automation. 2. Centerless jig centerless fixture of the characteristics of the workpiece axis rotation axis with the positioning of the actual size and shape of the surface differences and changes, its advantages are as follows high repeat positioning accuracy (2) of the grinder spindle radial runout effect on machining accuracy is abate, and radial runout of spindle is not completely to the processing error (3) easy to no clamping deformation. (4) easy to loading and unloading workpieces, easy to realize automation. Centerless fixture types mainly include roller, mechanical compaction wheel and electromagnetic, is the most widely used electromagnetic. 1. 4. 2 roller centerless jig as shown in figure 1. 18, roller centerless jig is not intentional of clamping of the first to use a method, which is composed of support roller and pinch roller. The center of the support roller keep workpiece corresponding, pinch roller to prevent the workpiece during grinding beating, supporting wheel and pinch roller driven by workpiece rotation, make reference face close to the workpiece positioning device ( Positioning plate) In bearing industry, roller centerless fixture than centralizer is advanced, but there are also many shortcomings. (1) face positioning components with workpiece contact force is not big enough, not suitable for to end as a benchmark of grinding (2) affected by supporting wheel rotation accuracy directly. In addition to supporting cylindrical amount of a single radial plane diameter change completely after reflected to the outside of the grinding on the workpiece, has increased the deflection error. (3) the workpiece grinding accuracy is affected by the pinch roller, supporting wheel wear.