TWIN ROLL TYPE CONTINUOUS CASTING-ROLLING METHOD FOR Al-Mg-Si-BASED ALLOY PLATE, Al-Mg-Si-BASED ALLOY PLATE, AND AUTOMOBILE OUTER PLATE PRODUCED BY CONTINUOUS CASTING-ROLLING METHOD, AND CASTING ROLL

摘要

PROBLEM TO BE SOLVED: To provide a twin roll type continuous casting-rolling method where, in an Al-Mg-Si-based alloy plate, ripple marks caused on the plate surface and center line segregation formed at the central part of the plate thickness can be suppressed, to provide an Al-Mg-Si-based alloy plate and an automobile outer plate obtained according to the casting-rolling method, and to provide casting rolls applied to the casting-rolling method. SOLUTION: In the twin roll type continuous casting-rolling method where the molten metal of an Al-Mg-Si-based alloy is introduced into the space between vertically arranged casting rolls so as to produce the Al-Mg-Si-based alloy plate with a thickness of 3 to 10 mm, casting and rolling are carried out in such a manner that the angleθformed by a line obtained by connecting the point at which the casting roll arranged on the upper side and the introduced molten metal are first brought into contact with each other and the central point of the casting rolls arranged on the upper side, and a perpendicular from the central point is controlled to 8 to 15°. COPYRIGHT: (C)2006,JPO&NCIPI