Method for forming hole-processed cast, cast casing, and screw compressor casing
AssigneeKobe Steel, Ltd.
InventorsToshiyuki Miyatake, Tomoya Yonetsu
Life of this patent
Estimating the term…
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.
Claims8
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 to be drilled with the drill to form a through hole;
- a step of positioning the drill against the cast such that a rotational axis of the drill is set in perpendicular to the flat inner wall surface of the cast hole;
- and
- a drilling step of drilling with the drill through the flat inner wall surface to form the through hole on the flat inner wall providing communication between an interior of the cast hole and an exterior of the cast, wherein
- a relative size between the diameter D of the drill and a width dimension H2 of the flat inner surface of the cast hole is set such that H2=H1+D, where H1=a manufacturing error range of the casting step.
Dependencies are inferred from the claim text.