There are three different ways of boring
(1) The workpiece rotates and the tool moves in feed. Boring on the lathe mostly belongs to this boring method. The technological characteristics are: the axis of the hole after processing is consistent with the rotation axis of the workpiece, the roundness of the hole mainly depends on the rotation accuracy of the spindle of the machine tool, and the axial geometry error of the hole mainly depends on the position accuracy of the tool feed direction relative to the rotation axis of the workpiece. This boring method is suitable for machining holes with coaxiality requirements on the outer surface.
(2) tool rotation, the workpiece for the feed movement boring machine spindle drives the boring tool rotation, worktable drives the workpiece for feed movement.
(3) tool rotation and feed movement using this boring way boring, boring bar overhang length is changing, boring bar deformation is also changing, near the spindle box at the aperture, away from the spindle box at the aperture is small, forming a taper hole. In addition, the overhanging length of the boring bar increases, the bending deformation of the spindle caused by its own weight also increases, and the axis of the machined hole will produce corresponding bending. This boring method is only suitable for machining short holes.
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