Method for forming hole-processed cast, cast casing, and screw compressor casing
AssigneeKabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
InventorsToshiyuki MIYATAKE, Tomoya YONETSU
Life of this patent
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Abstract
A method for forming drilled cast which includes drilling with a drill so as to provide communication with a cast hole includes a casting step and a drilling step. The casting step is to cast a cast having a cast hole which includes a flat inner wall surface in which width of a position to be drilled with the drill is obtained by adding first length H1 serving as a manufacturing error range of the cast to a diameter D of the drill, which is a second length H2. The drilling step is to form a through hole providing communication between an interior of the cast hole and an exterior of the cast through the flat inner wall surface with the drill.
Claims13
A method for forming drilled cast which includes drilling with a drill so as to provide communication with a cast hole, comprising:
- a casting step of casting a cast having the cast hole which includes a flat inner wall surface in which width of a position to be drilled with the drill is obtained by adding a first length H1 serving as a manufacturing error range of the cast to a diameter D of the drill, the width being a second length H2;
- and
- a drilling step of drilling with the drill to form a through hole providing communication between an interior of the cast hole and an exterior of the cast through the flat inner wall surface.
A cast casing drilled with a drill so as to provide communication with a cast hole, comprising
- a cast hole including a flat inner wall surface in which width of a position to be drilled with the drill has at least a second length H2 obtained by adding a first length H 1 serving as a manufacturing error range of a cast to a diameter D of the drill, and
- a through hole formed by drilling with the drill, the through hole providing communication between an interior of the cast hole and an exterior of the cast through the flat inner wall surface.
A screw compressor casing which is a cast casing drilled with a drill so as to provide communication with a cast hole at an intermediate position in the axial direction, the screw compressor casing comprising:
- a cast hole formed by using an evaporative pattern passing through a cast in a full-mold casting process, the cast hole including a flat inner wall surface in which width of a position to be drilled with the drill has at least a length obtained by adding a first length H1 of 1.5 mm to 3 mm as a manufacturing error range of the cast to a diameter D of the drill, the length being a second length H2;
- and
- a through hole formed by drilling with the drill in the direction orthogonal to an imaginary center line of the cast hole in a case where displacement of the cast hole with respect to the cast casing is supposed not to be generated in a casting step, the through hole providing communication between an interior of the cast hole and an exterior of the cast through the flat inner wall surface.
Dependencies are inferred from the claim text.