Title:
TUBE WITH GROOVED INNER FACE AND METHOD FOR MANUFACTURING IT
Document Type and Number:
Japanese Patent JP3794341
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a tube with a grooved inner face which is manufactured at high yield without causing break by a roll rolling method and a manufacturing method for it.
SOLUTION: A tube 1 which consists of copper or copper alloys, is an unannealed H-material, the proof stress of which is 200-500 N/mm2 and the proof stress/tensile strength ratio of which is 0.65-0.95 is prepared as a tube stock before forming grooves. Next, the tube 1 is diametrically reduced with a die 2 and a plug 7, the grooves 12 are formed on the inner face of the tube with a pair of rolls 3 and a grooving plug 9, sizing is performed to the tube 1 with a die and grooves 13 are formed on the inner face with a pair of rolls 5 and a grooving plug 11. Next, the tube 14 with the grooved inner face is manufactured by reducing its diameter with a die 6 and annealing it.
Inventors:
Nobuaki Hinako
Saeki main tax
Kiyonori Ozeki
Hideki Iwamoto
Saeki main tax
Kiyonori Ozeki
Hideki Iwamoto
Application Number:
JP2002093384A
Publication Date:
July 05, 2006
Filing Date:
March 28, 2002
Export Citation:
Assignee:
Kobelco Material Copper Tube Co., Ltd.
International Classes:
B21C1/22; B21B17/10; B21C1/24; B21C3/08; B21C3/16; B21C37/15; B21C37/20; B21C37/30; B21D17/04; B21D53/06; F28F1/40; B21B3/00; B21B15/00; B21B23/00; B21B25/00; B21B37/46; (IPC1-7): B21C1/22; B21C1/24; B21C3/08; B21C3/16; B21D17/04; F28F1/40; //B21D53/06
Domestic Patent References:
| JP2197551A | ||||
| JP58086923A | ||||
| JP9057328A | ||||
| JP9052127A | ||||
| JP615345A | ||||
| JP61266122A | ||||
| JP4302999A |
Attorney, Agent or Firm:
Masanori Fujimaki
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