Lubricating oil-less deep drawing of aluminum sheets assisted by lubricating resin film coating and water pressure

摘要

A newly developed deep drawing method is friendly to environment, because it does not need cleaning and degreasing as after treatment. The properties and the limit of deep drawing process have been investigated using 1100 and 5052 aluminum alloy sheets. On the method, the original sheet is covered by lubricating resin film and then formed by a radial-pressure-assisted hydraulic counterpressure deep drawing method using water as a pressure medium. When a lubricating resin film covets whole area of both sides, the fracture-suppressive effect by friction generated in punch and formed side wall is decreased. So that, the limiting drawing ratio becomes smaller than that of original sheet without lubricating oil. However, if lubricating resin film covers not bottom and punch profile radius, but covers only flange zone, the limiting drawing ratio indicates larger than that of original sheet without lubricating oil. The above method shows good effect of lubricating resin treatment.