Title:
MULTI-LAYER TUBE USING HIGH-PRESSURE TUBE-HYDROFORMING AND MANUFACTURING METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2010/071259
Kind Code:
A1
Abstract:
The present invention comprises: a step for preparing a mold including an outer tube, an inner tube having a diameter of 95~98% of the diameter of the outer tube, and a molding groove having a diameter of 100.20~100.30% of the diameter of the outer tube; a step for inserting the inner tube into the outer tube and settling the tubes in the molding groove; a first molding step for expanding the inner tube to bring the inner tube into contact with the outer tube by injecting fluid into the inner tube to the first molding pressure; a second molding step for elastically expanding the outer tube to bring the outer tube into contact with the inner groove by increasing the hydraulic pressure of the inner tube to the second molding pressure; and an elasticity restoring step for bonding the outer tube and inner tube by restoring the elasticity of the outer tube through the removal of the fluid injected into the inner tube. The first molding pressure of the first molding step ranges within10~20% of the yield strength of the inner tube. The second molding pressure of the second molding step ranges within 10~20% of the sum of the yield strengths of the inner and outer tubes and is maintained for 2~3 seconds.
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Inventors:
HUR, Ju Haeng (1 Ipark, Sinjeong 2-dong Nam-gu, Ulsan 680-012, 680-012, KR)
허주행 (울산 남구 신정2동 아이파크 107동 1401호, 680-012 Ulsan, 680-012, KR)
JEON, Dong Hyun (1 Sunkyung 1-cha Apt, Ujeong-dong Jung-gu, Ulsan 681-250, 681-250, KR)
전동현 (울산 중구 우정동 선경1차아파트 109동 1402호, 681-250 Ulsan, 681-250, KR)
KIM, Yun Gyu (1 Pyeongchang 3-cha Apt, Samsan-dong Nam-gu, Ulsan 680-020, 680-020, KR)
허주행 (울산 남구 신정2동 아이파크 107동 1401호, 680-012 Ulsan, 680-012, KR)
JEON, Dong Hyun (1 Sunkyung 1-cha Apt, Ujeong-dong Jung-gu, Ulsan 681-250, 681-250, KR)
전동현 (울산 중구 우정동 선경1차아파트 109동 1402호, 681-250 Ulsan, 681-250, KR)
KIM, Yun Gyu (1 Pyeongchang 3-cha Apt, Samsan-dong Nam-gu, Ulsan 680-020, 680-020, KR)
Application Number:
KR2009/000402
Publication Date:
June 24, 2010
Filing Date:
January 28, 2009
Export Citation:
Assignee:
HYUNDAI HYSCO (265 Yeompo-dong, Buk-gu, Ulsan 683-711, 683-711, KR)
현대하이스코 주식회사 (울산 북구 염포동 265, 683-711 Ulsan, 683-711, KR)
HUR, Ju Haeng (1 Ipark, Sinjeong 2-dong Nam-gu, Ulsan 680-012, 680-012, KR)
허주행 (울산 남구 신정2동 아이파크 107동 1401호, 680-012 Ulsan, 680-012, KR)
JEON, Dong Hyun (1 Sunkyung 1-cha Apt, Ujeong-dong Jung-gu, Ulsan 681-250, 681-250, KR)
전동현 (울산 중구 우정동 선경1차아파트 109동 1402호, 681-250 Ulsan, 681-250, KR)
현대하이스코 주식회사 (울산 북구 염포동 265, 683-711 Ulsan, 683-711, KR)
HUR, Ju Haeng (1 Ipark, Sinjeong 2-dong Nam-gu, Ulsan 680-012, 680-012, KR)
허주행 (울산 남구 신정2동 아이파크 107동 1401호, 680-012 Ulsan, 680-012, KR)
JEON, Dong Hyun (1 Sunkyung 1-cha Apt, Ujeong-dong Jung-gu, Ulsan 681-250, 681-250, KR)
전동현 (울산 중구 우정동 선경1차아파트 109동 1402호, 681-250 Ulsan, 681-250, KR)
International Classes:
B21D26/02; B21D26/033; B21D26/041; B21D26/051
Attorney, Agent or Firm:
DEA-A INTERNATIONAL IP & LAW FIRM (7F. Memo B/D, 719-21 Yeoksam-dong, Gangnam-gu, Seoul 135-920, 135-911, KR)
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