| 摘要 |
PURPOSE:To obtain a laminate processed mold material in the reduced number of working processes without using a large amount of chemicals causing a public nuisance generating source, in the treaing process of an extrusion mold material comprising an Al material, by forming a boehmite skin film on a material to be treated at the time of hot extrusion molding thereof. CONSTITUTION:When a material to be treated such as Al or an Al alloy is subjected to hot extrusion molding, a boehmite teating liquid is blown onto the surface of the material to be treted held under a high temp. state directly after extrusion molding and a boehmite skin film is instantaneously formed on the surface thereof by the remaining heat of the mold material itself. This treting liquid may be usual pure water or aqueous ammonia. In the next step, this mold material is applied to a stretcher to carry out stress correction and, after cutting, ageing treatment due to heat tratment is applied. Because the mold material undergoing ageing treatment already has the boehmite skin film formed thereon, it is unnecessary to apply special chemical forming film treatment or anodic oxidation film treatment after ageing tretment. Therefore, the mold material undergoing ageing treatment is directly sent and supplied to a processing machine and a surface decorating sheet is adhered to the mold material by an adhesive to obtain a product. |
