Extrusion die and bar forming method

The invention discloses an extrusion die and a bar forming method, and belongs to the technical field of metal material machining. The extrusion dies are divided into two sets; each set comprises a male die and a female die; the male dies are a pair of cylindrical male dies; each female die is composed of two half dies; and a female die cavity is divided into a two-way extrusion section cavity andan L-shaped equal-channel corner extrusion section cavity. When a bar is formed, the pair of male dies extrude a blank in two directions, so that the blank sequentially passes through the two-way extrusion section cavity and the L-shaped equal-channel corner extrusion section cavity, and the prefabricated bar is formed. The steps are repeated by using another set of die to obtain a fine-grain bar. The bar forming method is high in universality and easy to operate, bar grains can be refined, and the bar preparation quality is improved. 本发明公开了一种挤压模具及成形棒料的方法，属于金属材料的加工技术领域。挤压模具有两组，均包括凸模和凹模，所述凸模为一对圆柱形凸模，凹模由两个半模组成，凹模型腔分为双向