The invention provides a horizontal
flanging die mechanism. The mechanism comprises a
pulley mechanism, a
rollback mechanism and a side material pressing core
assembly, wherein one end of the upper surface of the
pulley mechanism is provided with a
flanging insert, and a mounting part and a sliding part are defined in the
pulley mechanism; the
rollback mechanism is arranged in the sliding part ina sliding mode; the side material pressing core
assembly is arranged in the mounting part, and a male
die cutting edge is arranged below one side of the side material pressing core
assembly. Accordingto the horizontal
flanging die mechanism, in the whole flanging process, the pulley mechanism, the
rollback mechanism and the side material pressing core assembly jointly complete feeding and returning actions, the male
die cutting edge is machined below one side of the side material pressing core assembly and functions as material pressing and a male die, the pulley mechanism drives the flanginginsert to move in the horizontal direction far away from a fixed male die, and a flanging area of a workpiece is horizontally flanged from inside to outside. The horizontal flanging die mechanism simplifies the
stamping process and improves the working efficiency.