Spindle machining of the main problems is how to ensure the spindle bearing journal size, shape, location accuracy and surface roughness, the front spindle outside cone shape accuracy, surface roughness and their supporting journal positional accuracy.
The spindle bearing journal of the dimensional accuracy, shape accuracy and surface roughness, precision grinding guarantee. Should raise the fine benchmark of precision grinding.
To ensure that the front spindle outside cone shape accuracy, surface roughness should also be using the methods of precision grinding. In order to ensure the accuracy of the location outside the cone relative positional accuracy of the bearing journal and the bearing journal, usually using the combination of grinding, processing these surfaces in a single setup on the machine there are two independent wheel frame, refined grinding on the two stations, station Ⅰ grinding, journal cone, station II, the angle forming the grinding wheel, grinding the front spindle bearing surface and a short cone.
Spindle taper hole relative to the position of the bearing journal precision by using the bearing journal A, T-locating datum, and let the processing spindle clamping in grinder workbench processing to guarantee. Bearing journal as the cone positioning reference processing, in line with the benchmark coincidence principle. Before grinding the front taper, so that the bearing journal as a locating datum A, T reach a certain accuracy. Spindle taper grinding is generally a special fixture, the fixture base, frame, and a floating chuck, two brackets on the base, as the two journal of the workpiece positioning surface on the bracket of two V shaped block, V-shaped set with carbide to improve wear resistance and reduce the scratches on the workpiece journal, the center of the workpiece high should be exactly equal to the center of the grinding head wheel axis, it will be tapered bore The bus was hyperbolic, affect the accuracy of taper contact. Back-end floating chuck with taper shank mounted on the grinding machine spindle taper hole, the workpiece end of the plug comprising elastic spring floating chuck shell, together with the workpiece to the left pull pressure to the set with carbide ball taper shank end, to limit the axial movement of the workpiece. With this connectivity options, ensure the positioning accuracy of the workpiece bearing journal from the impact of the internal grinding machine spindle error, can also reduce the machine itself, the impact of vibration on the processing quality.
Processing of the spindle cylindrical surface, the top hole as the unified positioning benchmark. But in the process of the spindle, with the processing of through-hole, as the center hole of the positioning surface disappear, technology is often used a cone with a center hole to plug the holes on the spindle at both ends, so that the cone plugging the top hole from the additional positioning the role of the benchmark.
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