Method for manufacturing flat pipe

Patent metadata

Field	Value
Publication number	US-9403201-B2
Application number	US-201314413271-A
Country	US
Kind code	B2
Filing date	Oct 24, 2013
Priority date	Oct 29, 2012
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

A method for manufacturing a flat pipe 1 with concave-convex shapes on inner and outer surfaces includes making incisions with an expanded shape of the flat pipe 1 in a metal thin plate 2 such that intermediate portions 4 (middle portions) in the expanded shape of the flat pipe 1 widthwise of the expanded shape are left uncut from the thin plate 2 , machining the concave-convex shapes in a range of the expanded shape of the flat pipe 1 and raising the expanded shape of the flat pipe 1 from the thin plate 2 as cut-and-raised pieces 8 with the uncut intermediate portions 4 in between, closing tips of the cut-and-raised pieces 8 together to form an overall shape of the flat pipe 2 , and separating the uncut intermediate portions 4 from the thin plate 2 to obtain the flat pipe 1.

First claim

The invention claimed is:

1. A method for manufacturing a flat pipe with concave-convex shapes on inner and outer surfaces, which comprises:
making incisions in a metal thin plate to provide a part having an expanded shape of the flat pipe, such that intermediate portions in said expanded shape of the flat pipe, provided widthwise of the expanded shape, are left uncut from said metal thin plate,
machining the concave-convex shapes on inner and outer surfaces in a portion of said part having the expanded shape of the flat pipe,
using upper and lower pressing molds to raise a region of said expanded shape of the flat pipe from said metal thin plate as cut-and-raised pieces with said uncut intermediate portions in between the raised regions,
closing tips of the cut-and-raised pieces together to form an overall shape of the flat pipe, and
after the step of using upper and lower pressing molds to raise a region of said expanded shape of the flat pipe from said metal thin plate, separating said uncut intermediate portions from said metal thin plate to obtain the flat pipe.

2. The method for manufacturing the flat pipe as claimed in claim 1 , wherein the closed tips of the cut-and-raised pieces are joined before the step of separating the uncut intermediate portions from the metal thin plate.

3. The method for manufacturing the flat pipe as claimed in claim 1 , wherein the closed tips of the cut-and-raised pieces are joined after the step of separating the uncut intermediate portions from the metal thin plate.

Assignees

• Hino Motors Ltd

Inventors

• Ishimori Takashi
• Okano Masayuki

Classifications

• B21D53/08 Primary

  of both metal tubes and sheet metal (connecting tubes in openings B21D39/06) · CPC title

• F28F1/025

  with variable shape, e.g. with modified tube ends, with different geometrical features (F28F1/06, F28F1/08, F28F9/16, F28F9/18 take precedence) · CPC title

• F28F1/426

  the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex · CPC title

• B21D5/16 Primary

  Folding; Pleating · CPC title

• F28F2255/08

  pressed; stamped; deep-drawn · CPC title