Method for punching brittle material and punching die to be used therefor
AssigneeNGK Insulators, Ltd.
InventorsHiroyuki Tsuji, Kazumasa Kitamura, Yoshinori Yamaguchi
Life of this patent
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Abstract
A method of forming a plurality of holes of fine diameter d in a brittle material at fine intervals α includes the steps of forming at least two holes having a fine diameter d at intervals A in the brittle material through the use of punches. The intervals A are at least two times the fine interval α. Holes are then subsequently punched between the previously punched holes at intervals A without removing the die punches used to form the previous holes. The distances between the previously punched holes and the subsequently punched holes measure at least the distance corresponding to the fine interval α.
Claims6
A method for forming a plurality of holes of fine diameter d at fine intervals α in a ceramic green sheet by punching, comprising the steps of:
- providing a die punch having a main surface and a plurality of punches adapted to extend therefrom;
- providing a die having a plurality of holes corresponding to said plurality of punches;
- providing a stripper between said die punch and said die;
- providing a stopper on said die to prevent said stripper from crushing the ceramic green sheet;
- punching at least two holes having said fine diameter d at intervals A in the ceramic green sheet through the use of the punches, said intervals A being at least two times the fine interval α;
- and
- subsequently punching holes having said fine diameter d between the previously punched holes at said intervals A without removing the die punches used to form said at least two holes, such that distances between the previously punched holes and the subsequently punched holes measure at least the distance corresponding to the interval α.
Dependencies are inferred from the claim text.