Metal Industries Research & Development Centre

Ping-Hsun Tsai

Wan-Chi Chang

Chih-Peng Hsu

An extrusion die device includes a first die having a shaping hole. An inner periphery of the shaping hole has a plurality of twisted guiding portions. A second die includes a plurality of guiding holes. A bridge is formed between two adjacent guiding holes. A plurality of tongues extends from a surface of each bridge and each includes an input end face contiguous to the bridge and an output end face whose projection on the surface of the bridge has an angular shift relative to the input end face. A side of the second die is coupled to an input side of the first die. The tongues are received in the shaping hole. Material is squeezed through a passage between each tongue and the inner periphery of the shaping hole and rotates according to the twisting direction of the tongues, forming a hollow object with an integrally formed helical rib.

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Taichung, Taiwan

Ping-Hsun Tsai