Lubricating oil for aluminum alloy sheet warm forming and aluminum alloy sheet warm forming method

摘要

PPROBLEM TO BE SOLVED: To provide a lubricating oil for warm molding of an aluminium ally plate usable at a temperature of 150C or above without containing a powdery material. PSOLUTION: The lubricating oil comprises a 20-70 pts.wt. poly -olefin prepared by polymerizing a 8-12C 1-alkene and a 100 pts.wt. polyol fatty acid ester, and has a dynamic viscosity at 40C of 10-1,000 mmSP2/SP/s and a pour point of 20C or below. Preferably, desirable dynamic viscosities of the polyol fatty acid ester and the poly -olefin are 5-300 mmSP2/SP/s and 30-13,000 mmSP2/SP/s, respectively. The warm molding method comprises coating one or both sides of the surface and the reverse face of an aluminium ally plate with the lubricating oil, heating one or both of a dice and a presser die at 150-300C, holding the aluminium ally plate by the dice and the presser die, and pushing a punch or a water-cooled punch onto the plate. PCOPYRIGHT: (C)2009,JPO&INPIT