Blanking mould for central hole of part

The utility model discloses a blanking mould for a central hole of a part, which comprises a concave mould and a convex mould, wherein the convex mould is fixed in a convex mould fixing base; the upper part of the convex mould fixing base is sleeved in an unloading sleeve; the convex mould fixing base is in sliding fit with the unloading sleeve; the lower end of the convex mould fixing base is fixed on a mould base; the unloading sleeve is sleeved in a positioning sleeve; the unloading sleeve is in sliding fit with the positioning sleeve; an inclined part positioning surface is formed on an upper end part of the positioning sleeve; a vertical long slot is formed on the peripheral surface of the positioning sleeve; a bolt fixed on an adjusting base slides in the vertical long slot; and the adjusting base is fixed in a slot of a lower mould base. The blanking mould has the beneficial effects: the inclined plane positioning of the positioning sleeve is adopted and an external circle of the part is clung to the p