Elbow formed by cutting and method for manufacturing same
AssigneesKeiko HORIGUCHI, Noda Kanagata Co., Ltd.
InventorNobuo HORIGUCHI
Life of this patent
Estimating the term…
Abstract
A hole is formed in an elbow through the steps of: forming a starting hole in a material, the starting hole having an undercut remaining on a hole surface; finishing an inner diameter of the starting hole (11-3) on one end side by revolving aside cutter (II) including an arc-shaped cutting edge and having an outer diameter smaller than a finishing hole diameter while rotating the side cutter (II) in such a posture that the side cutter (II) is inclined in a predetermined direction relative to the material (12), the revolving being carried out so that the side cutter moves along a hole surface to be finished; and finishing the inner diameter of the starting hole (11-3) on another end side by revolving the side cutter (II) while rotating the side cutter (II).
Claims7
An elbow, comprising a hole having an center axis that is bent smoothly at a predetermined curvature,
- the hole having no machining remainder part inside and being a true circle, the hole having a hole surface provided in parallel to the center axis of the elbow, the elbow having a uniform wall thickness around a tube.
An elbow, comprising a hole having an center axis bent smoothly at a predetermined curvature,
- the hole having no machining remainder part inside and being a true circle, the hole having a hole surface provided in parallel to the center axis of the elbow, the hole of the elbow having a center eccentrically located with respect to a center of an outer diameter of the elbow so that a tube wall thickness on an outer side of a bend is larger than a tube wall thickness on an inner side of the bend.
Dependencies are inferred from the claim text.