B - Operations – Transporting – 21 – B
Patent
B - Operations, Transporting
21
B
B21B 3/00 (2006.01) B22D 11/00 (2006.01) C22C 23/00 (2006.01) C22F 1/06 (2006.01)
Patent
CA 2601806
A process for producing a continuous magnesium material having excellent suitability for plastic working; and a continuous magnesium material obtained by the process. Pure magnesium or a magnesium alloy is cast and this cast material is subjected to plastic working to obtain a continuous processed material. The plastic working involves hot working which is conducted at 250~C or higher so as to result in a decrease in sectional area. Hot working yields oxides around the surfaces of the work during the working. Because of the presence of such oxides around the surface of the processed material, there is a possibility that the oxides might serve as starting points for cracks or wire breakage when the processed material is subjected to plastic working (secondary processing) such as wire drawing or forging. In this process, a surface layer of the processed material is hence removed to thereby effectively eliminate the oxides serving as starting points for cracks or wire breakage. Thus, suitability for secondary processing is improved.
L'invention concerne un procédé destiné à produire un matériau en magnésium continu se prêtant de manière excellente au formage plastique ; l'invention concerne également le matériau en magnésium continu obtenu par le procédé. Du magnésium pur ou un alliage de magnésium est coulé et le matériau coulé est soumis à un formage plastique afin d'obtenir un matériau transformé continu. Le formage plastique implique un formage à chaud conduit à 250 °C ou plus et visant à réduire l'aire de la section. Le formage à chaud produit des oxydes autour des surfaces de travail pendant le travail, lesquels oxydes peuvent éventuellement servir de point de départ à des fissures ou des ruptures de fil lorsque le matériau transformé est soumis à un formage plastique (transformation secondaire) tel qu'un tréfilage ou un forgeage. Pendant le procédé de l'invention, une couche de surface du matériau transformé est par conséquent retirée afin d'éliminer efficacement lesdits oxydes. Ainsi, l'aptitude à la transformation secondaire est améliorée.
Nakai Yoshihiro
Nishikawa Taichiro
Marks & Clerk
Sumitomo Electric Industries Ltd.
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