| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow guide capable of easily determining the shape of an opening part, and optimizing the flow speed of the metallic material inside die holes by the opening part. SOLUTION: The shape of a flow guide opening part 53 is determined in the following procedure. The minimum wall thickness a1, and the coefficient of delay Yi are determined by the material of the metal, the extrusion temperature, and the extrusion speed, and can be experimentally obtained in advance. The equivalent wall thickness wi at reference points P1-P10 of the die hole 51 is respectively calculated. The dimensions of the parts indicated by an arrow on each end can be determined by appropriately selecting the reference wall thickness w0 of the die holes and the reference opening width C0 of the flow guide opening part in accordance with the formula Ci =C0×(w0 -a1)/(wi -a1)/Yi . The flow speed of the metallic material inside the die hole can be optimized by the flow guide opening part of such a shape.
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