Method for subjecting molded article to isostatic pressing
AssigneeNGK Insulators, Ltd.
InventorTaketoshi Tsutsumi
Life of this patent
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Abstract
A method for subjecting a molded article formed of a powder material and having a complicated shape to isostatic pressing includes covering the molded article with a water impermeable rubber film. The surface area of the rubber film is larger than the surface area of the molded article. In the method, the rubber film follows the complicated shape, e.g., a shape having notch(es), throughhole(s), dent(s), and bend(s), or a cylindrical shape, of the molded article. As a result, the rubber film is rarely damaged during isostatic pressing and the ease of removal of the rubber film after isostatic pressing is significantly improved.
Claims15
A method for subjecting a molded article comprised of a powder material and having a complicated shape to isostatic pressing, the method comprising the step of covering the molded article with a water impermeable rubber film having a thickness of 0.2-1 mm, the rubber film having a surface area larger than a surface area of the molded article.
A method for isostatically pressing a molded article, the method comprising the steps of:
- providing a molded article comprised of a powder material and having a complicated shape;
- covering said molded article with a rubber envelope, said rubber envelope being elastic and impermeable to a liquid medium used for cold isostatic pressing, said rubber envelope having a thickness of 0.2-1 mm and a surface area larger than a surface area of said molded article, and said rubber envelope having a shape selected from the group consisting of a bag shape having one open end and a tubular shape having a first open end, a second open end, and a hollow portion extending from said first open end to said second open end;
- and
- cold isostatically pressing said molded article with said rubber envelope in the liquid medium.
Dependencies are inferred from the claim text.