Introduction of forming die for drilling tail screw

The utility model relates to a forming mould for drilling tail screw. In order to provide a fastener processing die with simple module manufacturing, low cost, high strength and good machinability of the formed drill tail, the utility model is proposed, which is composed of two modules of the same shape arranged in a relative manner, and the concave arc-shaped molding mold cavities corresponding to the tail of the drill tail screw drill are respectively arranged at the center of the upper section of the stamping surface of the two modules, and the left and right ends of the forming die cavity are edge shaped In addition, a small section of material guiding slope and a material retaining plane connected with the material guiding slope are arranged around the forming die cavity.

An improved screw forming die includes a shell and a die core; the shell is made of alloy steel, with a hardness value of about 46hrc; a forming hole is arranged in the center of the shell, and a holding groove is arranged on the upper end face; the mold core is made of tungsten carbide steel with a hardness value of more than 65hrc, and a forming hole is arranged in the center; the inner mold layer is made of alloy steel, with a hardness value of medium Between the hardness of the shell and the hardness of the mold core, a consistent perforation is arranged in the center of the inner mold layer, which is forced into the holding groove of the shell by oil pressure, and the mold kernel is forced into the through hole of the inner mold layer by the oil pressure, and the forming hole of the mold kernel corresponds to the forming hole of the shell. It can effectively improve the service life.