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AssigneesSanoh Industries Co., Ltd., Sumitomo Metal Industries, Ltd., Sumitomo Pipe & Tube Co., Ltd.
InventorKazuhiro Ezure
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To provide manufacturing method for a double tube having a hole formed therein and a mold for implementing such method, which reduce the time required for manufacturing, do not leave shavings in the gap between the outer tube and the inner tube, and offer highly accurate hole positioning. The manufacturing method for a double tube having a hole formed therein pertaining to the present invention uses a mold in which a punch is located in at least one of the split mold halves that form the outer circumferential surface, an indentation is formed by drawing the punch into the mold, and fluid pressure is applied between the outer tube and the inner tube of the double tube located within the mold to form a hole in the circumferential wall of the outer tube via such indentation. Furthermore, the punch is placed in the mold in a watertight fashion.
A manufacturing method for a double tube having inner and outer tubes with a hole formed in the outer tube, which comprises:
A manufacturing method for a double tube having a hole formed therein, wherein such method uses a mold in which a punch is located in at least one of the split mold halves that form an outer circumferential surface of the mold, an indentation is formed by drawing said punch into said mold, fluid pressure is applied between the outer tube and the inner tube of the double tube located within the mold, and a hole is formed in the circumferential wall of said outer tube by means of such indentation, and said indentation is formed before said fluid pressure is applied between said outer tube and said inner tube.
A manufacturing method for double tube having inner and outer tubes with a hole formed in the outer tube, which comprises:
Dependencies are inferred from the claim text.