The Furukawa Electric Co., Ltd.

Kazuhiro Itabashi

Kazumi Kato

Toshiyuki Kakinoki

Akira Mitsumaru

A method of determining at least one dimension of an extrusion die includes determining a plurality of reference points on a contour of an opening of the extrusion die. Sizes of a plurality of figures with same shapes corresponding to the plurality of reference points are determined. Each of the plurality of figures is inscribed in the contour of the opening and has at least one axis of symmetry. Each of the plurality of figures contacts each of the plurality of reference points and at least one another point on the contour. The at least one dimension of the extrusion die is determined based on the sizes of the plurality of figures.

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Tokyo, Japan

Kazuhiro Itabashi