| 摘要 |
PURPOSE:To maintain the superelasticity of spectacle parts without being lost even in extremely cold season and cold climate areas by using a superelastic alloy to the spectacle parts and molding the alloy in such a manner that the superelastic characteristic is obtd. over the practicable service temp. range of spectacles, then heating and quickly cooling the molding and subjecting the molding to a heat treatment. CONSTITUTION:The parts of the spectacles are formed of the superelastic alloy and after said parts are heated to >=650 deg.C, the parts are quickly cooled. The heating and quick cooling are intended to lower soln. heat treatment and reverse transformation temp. Solutionization is not enough if the temp. is below 650 deg.C in the case of an NiTi alloy. The upper limit is permitted up to the temp. right below the m. p. of the alloy and is preferably 650-1,050 deg.C. The alloy cooled by, if possible, quick cooling from said temp. is subjected to a heat treatment at 150-450 deg.C, by which the desired superelastic characteristic is used. The amt. at which the parts restore the original shape is large even if the parts are deformed and, therefore, the original shape is always maintained if the rubber elasticity having several % of elastic strain is imparted to the parts in the entire service temp. range of the spectacles. |
