| 摘要 |
This improved fixed-super-abrasive tool for grinding and polishing toric and other curvilinear lenses is produced by a novel method of manufacture and comprises a substantially-rigid, super-abrasive-free backing member and a malleable preformed super-abrasive wafer conformed and releasably secured thereto. The substantially-rigid, super-abrasive-free backing member has a curved support surface determinative of the curvature of the curvilinear working surface. The substantially-malleable preformed abrasive wafer has a predetermined thickness and one surface which, in the method of the present invention, is conformed to the curved support surface, either before or at the time of securing. The wafer comprises super-abrasive particles having a Knoop Hardness in excess of about 3000 kg/mm2 in a malleability-imparting powdered metal matrix, which facilitates the conformation step. A porous surface may be created by introduction of particles which are dissolved during use of the tool, leaving pores which assist the grinding and polishing processes.
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