| 摘要 |
PROBLEM TO BE SOLVED: To provide an extrusion die for a porous tube which is superior in durability, able to stably manufacture the highly precise porous tube and appropriate for manufacturing the porous tube, each hole of which is extremely small. SOLUTION: The extrusion dies comprise a male die 2 to form each hole part T1 in the porous tube material T with a long hole forming section 5a and a female die 3 to form a peripheral part of the porous tube material T through an extrusion hole 12a. The male die 2 comprises a ring-shaped body 4 with a bridge section 4b and a mandrel 5 attached to the bridge section 4b with the hole forming sections 5a, 5a, etc., arranged in a row in its front end. Then, the female die 3 is provided with a mandrel pinching plate 13 which is located at the upper stream side in the extrusion direction of the extrusion hole 12a and has a open hole 13a corresponding to the extrusion hole 12a. In each hole forming section 5a on the mandrel 5, locking grooves 10, 10 are formed on both sides in the thickness direction of the mandrel 5. At opposite positions around the open hole 13a of the mandrel pinching plate 13, supporting arms 15, 15, etc., are installed in a designated pitch. The supporting arms 15, 15 facing each other are locked by the locking grooves 10, 10 on the each hole forming section 5a so that the hole forming section 5a is pinched and supported from both sides. COPYRIGHT: (C)2003,JPO
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