Process for making a minute hole
AssigneesKabushiki Kaisha Toyota Chuo Kenkyusho, Aisin Seiki Kabushiki Kaisha
InventorsMasao Matsui, Atsunobu Murata, Masami Isii, Hiromu Komai
Life of this patent
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Abstract
An inexpensive process for making a minute circular hole having a smooth peripheral edge in a thin wall of a metal article. A depression is formed on one surface of the wall so as to simultaneously form a projection on the other surface thereof. The apex of the projection is positioned in a spaced relationship to a cathode in an electrolyte. An electric current is then introduced between the projection, which serves as an anode, and the cathode, which acts to selectively and anodically dissolve the apex of the projection so as to form a minute hole in the wall.
Claims8
A process for making a minute hole in the wall of a metal article, comprising the steps of:
- forming a depression in the wall of a metal article at a localized spot on one of the surfaces of said wall, said depression having a depth exceeding the thickness of said wall and having a projection with an apex extending from the other surface of said wall;
- positioning said apex of said projection formed on said other surface of said wall in an opposed spaced relationship to a cathode within an electrolyte;
- and
- introducing an electric current between said projection, which serves as an anode, and said cathode until said apex of said projection is dissolved to form a minute hole in said wall.
Dependencies are inferred from the claim text.