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1. (WO2018131434) EXPANSION TOOL, EXPANDING DEVICE, EXPANDING METHOD FOR HEATING TUBE, AND METHOD FOR MANUFACTURING A HEAT EXCHANGER

Pub. No.:    WO/2018/131434    International Application No.:    PCT/JP2017/046193
Publication Date: Fri Jul 20 01:59:59 CEST 2018 International Filing Date: Sat Dec 23 00:59:59 CET 2017
IPC: B21D 39/20
B21D 53/08
Applicants: MITSUBISHI ELECTRIC CORPORATION
三菱電機株式会社
Inventors: HAYASHI Tomoyuki
林 智行
UGAJIN Yuki
宇賀神 裕樹
Title: EXPANSION TOOL, EXPANDING DEVICE, EXPANDING METHOD FOR HEATING TUBE, AND METHOD FOR MANUFACTURING A HEAT EXCHANGER
Abstract:
An expansion tool (2a), which is inserted into the inside of a tube (3) to be worked from an opening end of the tube (3) to be worked for expanding the tube diameter of the tube (3) to be worked, is provided with: a tube expansion member (21) for expanding the tube diameter of the tube (3) to be worked by pressing the inside surface of the tube (3) to be worked; and an orientation maintaining member (22) in surface contact with the inside surface of the tube (3) to be worked for maintaining orientation of the expansion tool (2a) with respect to the tube (3) to be worked. The orientation maintaining member (22) is disposed in a position inserted into the tube (3) to be worked before the tube expansion member (21) and is affixed to the tube expansion member (21).