Method and former for necking and thickening tube end

A former for necking and thickening a tube end, comprising:

• a hydraulic cylinder,
• a pusher,
• a concave die,
• a filler block,
• a plurality of heating rods, and
• a heating device,
• wherein a cooling device is further provided between the hydraulic cylinder and the concave die;
• the cooling device and the concave die are both provided on a connecting plate;
• a through hole is provided on the cooling device and has an inner diameter equal to an inner diameter of the mold cavity;
• and an axial center of the pusher, an axial center of the mold cavity and a center of the through hole of the cooling device are in alignment;
• the hydraulic cylinder is connected to a disc;
• a guide sleeve is provided on the disc;
• the pusher is provided on the hydraulic cylinder and passes through the guide sleeve;
• the concave die is provided at a side of the pusher;
• the concave die comprises a mold cavity and a plurality of heating holes;
• the filler block is provided in the mold cavity;
• the plurality of heating rods are provided in the plurality of heating holes;
• and the plurality of heating rods are connected to the heating device;
• wherein the filler block comprises a tapered portion and a diameter-reduced portion;
• the tapered portion is provided at a first end of the filler block;
• the tapered portion is threadedly connected to the diameter-reduced portion;
• and an ejector pin is further provided at a first end of the diameter-reduced portion.