Abrégé

Disclosed in a method for manufacturing a drive shaft which comprises forming a first shaft unit by shrinking one side of a metallic pipe which has a uniform first strength; decreasing the thickness of an intermediate portion of the metallic pipe by drawing the intermediate portion of the metallic pipe which is integral with the first shaft unit; forming at an inner side surface of the other side of the metallic pipe a strength decrease unit which has a second strength smaller than the first strength, by heat-treating by a predetermined distance the inner side surface of the other side being opposite to one side of the metallic pipe; and forming a second shaft unit without transforming any portion of the intermediate portion by shrinking the metallic pipe which has the strength decrease unit, wherein the second shaft unit is formed by applying compression force to a portion where the strength decrease unit in the metallic pipe is formed, in a predetermine direction being vertical with respect to the axial direction of the metallic pipe.

Classes IPC  ?

• B21C 1/24 - Étirage par des machines ou appareils dans lesquels l'effort de traction est produit par des moyens autres que des tambours, p. ex. par chariot mû longitudinalement tirant ou poussant le matériau de façon à former des tôles, des barres ou des tubes métalliques spécialement adaptés à la fabrication d'objets tubulaires au moyen de mandrins
• B21D 53/84 - Fabrication d'autres objets particuliers d'autres parties de moteurs, p. ex. bielles de liaison
• B21D 41/04 - RétrécissementFermeture
• B21C 3/16 - MandrinsMontage ou réglage des mandrins
• B21C 3/02 - MatricesEmploi d'un matériau spécifié pour ces filièresNettoyage de ces filières
• B21C 9/00 - Refroidissement, chauffage ou lubrification du matériau à étirer
• F16C 3/02 - ArbresManivelles