| 摘要 |
<p>PROBLEM TO BE SOLVED: To attain a desired accuracy in dimensions of each tube constituting a multilayer-tube-shaped product in the case when the product is to be obtained by extrusion equipment. SOLUTION: A die 2 has a plurality of tubular upstream-side spaces 17 formed inside the rear part of a die main body 8 and a tubular downstream-side space 18 formed between the respective front sides of the inner peripheral surface of a die hole 7 and the outer peripheral surface of a mandrel 11. A tubular intermediate part space 19 is formed between the rear part side of the outer peripheral surface of the mandrel 11 and the respective inner peripheral surface of each formed tube body 14 facing the rear part side of the outer peripheral side of the mandrel. The front end part of the upstream-side space 17 (A) out of the upstream-side spaces 17 that is located outside the others in the radial direction is opened on more front side to the intermediate space 19 than the front end part of the upstream-side space 17 (B) located inside it.</p> |
