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US 11,440,074 B2Granted
Forming device, forming method, and metal pipe
AssigneeSumitomo Heavy Industries, Ltd.
InventorsAkihiro Ide, Masayuki Ishizuka, Norieda Ueno, Kimihiro Nogiwa
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Abstract
A forming device which expands a metal pipe material to form a metal pipe having a pipe portion and a flange portion includes a hardness lowering portion which lowers a hardness of the flange portion to be lower than a hardness of the pipe portion.
Claims8
A forming device that expands a metal pipe material to form a metal pipe having a pipe portion and a flange portion, the forming device comprising:
- a gas supply unit configured to supply a gas into the metal pipe;
- a first die and a second die that are paired with each other,
- wherein each of the first die and the second die comprises:
- a pipe forming surface configured to form the pipe portion,
- a flange forming surface configured to form the flange portion, and
- a hardness lowering portion configured to lower a hardness of the flange portion to be lower than a hardness of the pipe portion, and
- wherein the hardness lowering portion comprises:
- a temperature control portion configured to make a temperature of the flange forming surface at a time of formation higher than a temperature of the pipe forming surface.
5 more elements
Dependencies are inferred from the claim text.