Arm-like-structure producing method and arm-like structure
AssigneesFanuc Corporation, Tube Forming Co., Ltd.
InventorsKazutaka Nakayama, Kenichiro Abe, Masahiro Morioka, Yasutoyo Ooki, Keiichi Tsuchiya
Life of this patent
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Abstract
A method for producing an arm structure in which the arm structure is produced by: forming an arm precursor member having an external shape of the arm structure by, in a state in which a die is closed with a metal pipe member being disposed in a cavity thereof, pressurizing the pipe member with liquid supplied to an inside thereof to cause an external surface of the thus expanded pipe member to be pressed against an inner surface of the cavity; and forming a flange portion to be attached to a driven body by machining at least an end of the formed arm precursor member.
Claims11
An arm structure comprising:
- a pipe portion;
- and
- a pair of ring shaped flange portions on each end of the pipe portion, each flange portion formed so as to define a center hole about a central axis of each flange portion,
- wherein the center holes are located in a plane parallel to a longitudinal direction of the pipe portion, and
- the pipe portion and the flange portions are unitarily formed by deforming a single pipe material, wherein the ends of the pipe portion are bent radially outward such that opposed surfaces are separated by a predetermined distance, and
- when the arm structure is attached to another member by fastening bolts inserted through through-holes of the flange portions, the predetermined distance is reduced by fastening the bolts.
Dependencies are inferred from the claim text.