Bi-directional powder pressing forming device capable of demoulding automatically

The invention discloses a bi-directional powder pressing forming device capable of demoulding automatically. An upper mould frame is connected with a lower mould frame through guide columns; and the lower mould frame is fixed on the base board. An upper mould stamping is connected with an upper mould connecting rod which is connected with a first hydraulic cylinder. A lower mould stamping is fixed on the lower mould frame. Female moulds are mounted on the corresponding guide columns through four holes on two sides. Springs are sleeved on the corresponding guide columns of the lower faces of the females moulds and the upper face of the lower mould frame. The female moulds can float on the springs, and each is provided with a heating bar and a thermoelectric couple internally. One ends of four ejection rods are fixed on an ejection rod fixing plate, and the other ends of the ejection rods penetrate the upper mould frame and is located above the female mould. The ejection rod fixing plate is connected with a second hydraulic cylinder. By the aid of the spring floating female mould and the ejection rod structure, bi-directional pressing and automatic demoulding are achieved accurately, density distribution of a workpiece is improved, and production speed is increased. With a multi-punch and multiple-moulding-chamber structure, multiple workpieces can be produced by pressing at one time, mass production can be realized, and device utilization rate and working efficiency are increased.