Pipe manufacturing method and inner pipe of double pipe
OwnerTakayasu Isono, Masatsune Kondo +1inventors
InventorsTakayasu Isono, Masatsune Kondo, Yasuhiro Nobata
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Abstract
The present invention suggests a pipe manufacturing method by new plastic bonding with high bonding power and adopted to a thin pipe. With regard to the pipe manufacturing method that bonding fins 3a and 3b are provided at edges 2a and 2b of plural split pipes 2A and 2B split along longer direction and the split pipes 2A and 2B are united by caulking the bonding fins 3a and 3b of the split pipes 2A and 2B, the bonding fin 3a is wound around the other bonding fin 3b for caulking them so as to form creases 35 circularly centering on an axis of the roll form.
Claims10
A pipe manufacturing method that comprising:
- providing bonding fins at edges of plural split pipes split along a lengthwise direction;
- and
- uniting the split pipes by caulking the bonding fins of the split pipes, wherein
- one of the bonding fins is wound around the other bonding fin prior to caulking them so as to form creases circularly centering on an axis of a roll form.
An inner pipe of a double pipe constituting an exhaust system of an internal combustion engine, comprising
- bonding fins provided at edges of plural split pipes split along a lengthwise direction so that the split pipes are united by caulking the bonding fins of the split pipes, wherein
- one of the bonding fins is wound around the other bonding fin prior to caulking them so as to form creases arcuately centering on an axis of a roll form.
Dependencies are inferred from the claim text.