Curling die tool

A curling die tool used to form a curled edge of a workpiece, the curling die tool comprising:

• an upper die comprising an upper-die body and a warping-bending pressure portion capable of warping and bending the workpiece, the warping-bending pressure portion comprising a punch member and being secured to the upper-die body;
• a transmission member comprising a first supporting body corresponding to the punch member of the warping-bending pressure portion, for supporting the workpiece, and a curling pressure portion for curling the workpiece, and defining a first supporting groove facing the upper die, for receiving the first supporting body, and a curling-pressure-portion receiving groove opposite to the first supporting groove, for receiving the curling pressure portion;
• a lower die comprising a second supporting body facing the curling pressure portion, for supporting the workpiece, and defining a guiding groove and a second supporting groove receiving the second supporting body;
• wherein the transmission member is movably connected to the lower die and slides reciprocally within the guiding groove;
• wherein the transmission member comprises an H-shaped transmission body, the transmission body comprises a main body, a guiding portion, and an elongated protrusion, the main body comprises a second top surface, on which the first supporting groove is defined, the guiding portion protrudes from the main body, the protrusion protrudes from the main body, and the guiding portion, the protrusion, and the main body collectively form the curling-pressure-portion receiving groove firmly receiving the curling pressure portion.