Reciprocating extrusion device for preparing ultra-fine crystal material

A reciprocating extrusion device used to prepare superfine crystal materials belongs to the technical field of material processing, and comprises an upper compression bar, a concave die, a lower compression bar, a base, a cushion and a necking zone; wherein, the necking zone is arranged in the middle of the concave die and divides the concave die into an upper die chamber and a lower die chamber, the upper compression bar is arranged in the upper die chamber, the concave membrane is arranged on the base, a circular through hole at the correspondent position of the base and the lower die chamber of the concave die, the lower compression bar is positioned in the circular through hole of the base, a trough is positioned at the lower end of the base, and the cushion is arranged in the trough of the base. The utility model has the advantages of strong grain refinement capacity, simple structure, convenient operation, strong practicability and easy popularization.