EXPANDING MANDREL Russian patent published in 2022 - IPC B23B31/40 

FIELD: metalworking.

SUBSTANCE: invention relates to metalworking and can be used for basing parts of electrical machines at the end and inner surface for their turning. The expanding mandrel contains a double-sided expanding collet, a shank that turns into a rod, and a threaded part, a tapered bushing located stationary on the side of the shank, is made with a rectangular groove along the diameter of the outer surface, one side of the groove adjoins the larger side of the truncated cone. A removable washer with a groove is inserted into the groove, the second conical movable bushing is fitted along a sliding fit on the rod, secured from turning with a key and made with a cylindrical part, the end of which is fixed between the flange of the nut with an internal hexagon and a washer, the washer is put on the nut and fixed on it with a pin Thus, the nut is connected to the conical movable sleeve, and this, in turn, is fastened with a pin to a double-sided expanding collet.

EFFECT: fixing and processing along the diameter and end of the thin-walled cases of electrical machines with high accuracy and minimal loss of time for readjustment along the length.

1 cl, 1 dwg