Elbow formed by cutting and method for manufacturing same
AssigneesKeiko HORIGUCHI, Daido Die & Mold Steel Solution 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 a side 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).
Claims9
A method of manufacturing an elbow having a center axis that is bent smoothly at a predetermined curvature, the method comprising:
- preparing a metal material having a through hole;
- and
- finishing an inner surface of the through hole using a cutter, having cutting edges around an axis of the cutter and having an outer diameter smaller than a diameter of the through hole, by rotating the cutter to form the inner surface while the cutter is inclined at a constant angle with respect to the metal material and revolving along a helical trajectory, such that any cross-section of the through hole that is parallel to an end surface of the cutter and perpendicular to the center axis of the elbow is cut into a circle, whereas any cross-section of the through hole that is parallel to the end surface of the cutter and not perpendicular to the center axis of the elbow is cut into an oval.
A method of manufacturing an elbow having a center axis that is bent smoothly at a predetermined curvature, the method comprising:
- preparing a metal material having a through hole;
- and
- finishing an inner surface of the through hole using a cutter, having cutting edges around an axis of the cutter and having an outer diameter smaller than a diameter of the through hole, by rotating the cutter to form the inner surface while the cutter is inclined at a constant angle with respect to the metal material and revolving along a helical trajectory, such that each cross-section of the through hole that is parallel to an end surface of the cutter and not perpendicular to the center axis of the elbow is cut into an oval, and such oval cross sections include a first oval cross-section and a second oval cross-section, and the first oval cross-section of the through hole is different in size and shape from the second oval cross-sections of the through hole.
A method of manufacture comprising:
- preparing a metal material having a through hole;
- and
- finishing an inner surface of the through hole using a cutter, having cutting edges around an axis of the cutter and having an outer diameter smaller than a diameter of the through hole, by rotating the cutter to form the inner surface while the cutter is inclined at a constant angle with respect to the metal material and revolving along a helical trajectory, such that any cross-section of the through hole that is parallel to an end surface of the cutter and perpendicular to a center axis of the through hole is cut into a circle, whereas any cross-section of the through hole that is parallel to the end surface of the cutter and not perpendicular to the center axis of the through hole is cut into an oval.
Dependencies are inferred from the claim text.