B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 3/16 (2006.01) B21K 1/56 (2006.01)
Patent
CA 2203983
The present invention relates to a method for producing metal parts having internal threads which can be removed readily from a core bar without turning the formed metal parts having internal threads, and machine therefor. The invention comprises the steps of inserting a second core bar axially into the center of a first core bar which is axially devided into a multiple number and has a male thread section on its outer periphery; putting a metal cylinder on the male thread section of the first core bar; applying a pressure by a plurality of punches to the outer periphery of the metal cylinder in a centripetal direction to deform the metal cylinder to transfer the male thread section of the first core bar to the inner wall of the metal cylinder to form a female thread section; removing the second core bar which has been axially inserted into the center of the first core bar from the male thread section; and contracting the diameter of the male thread section of the first core bar in a centripetal direction to enable the removal of the metal cylinder having the female thread section formed therein without twisting.
Cette invention concerne une méthode et une machine servant à produire des pièces métalliques taraudées qui s'enlèvent facilement de la broche taraudeuse sans que l'on ait à les faire tourner. L'invention prévoit les étapes suivantes : insertion d'une seconde broche centrée dans la première broche qui est divisée en nombre multiple et comporte une section filetée; mise en place d'un cylindre métallique sur la section filetée de la première broche; application d'une pression centripète sur la face extérieure du cylindre métallique de manière à déformer la paroi intérieure de celui-ci à la forme du filetage de la première broche; retrait de la seconde broche de manière à dégager la partie filetée de la première broche et réduire le diamètre de cette section filetée pour permettre le retrait du cylindre métallique taraudé sans rotation de celui-ci.
M.h. Center Limited
Swabey Ogilvy Renault
LandOfFree
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