Clamp for gear hob

The utility model provides a clamp for a gear hob. The clamp comprise a hob mandrel assembly and a tip press plate assembly, wherein the hob mandrel assembly comprises a hob mandrel and a connection seat, a conical through hole is positioned in the connection seat, a conical section is arranged on the hob mandrel, the conical section of the hob mandrel is sleeved in the conical through hole of the connection seat, two ends of the hob mandrel extend out of the connection seat, the centre press plate assembly comprises a press plate and a centre, a horizontal through hole is positioned in the press plate, one end of the centre is sleeved in the horizontal through hole of the press plate, a threaded hole is positioned on the circumferential surface of the press plate, a circle of groove is positioned on the circumferential surface of the centre, the cross section of the groove is in an arc shape, and the groove corresponds to the through hole of the press plate. The clamp can save time for manually rotating a nu