Title:
MANDREL, CURVED PIPE, AND METHOD AND DEVICE FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2018/155414
Kind Code:
A1
Abstract:
This mandrel 10 is manufactured by performing rotary draw bending processing on a thin-walled curved pipe having a bent section with high strength and a small radius of curvature without causing any one among a crack outside a curve and wrinkling or buckling inside the curve, the mandrel being provided with a shank 14, a connection mechanism 15, and a mandrel ball 16. In a cross-section perpendicular to the axial direction at a central position in the axial direction of the mandrel ball 16, the mandrel ball 16 has a first position 19 and a second position 20 at which a first straight line m passing through the center 17 of the mandrel ball meets the outer circumferential surface 21 of the mandrel ball. Furthermore, the ratio (L1/L2) of the dimension L1, which is from the center 17 of the mandrel ball to the first position 19, to the dimension L2, which is from the center 17 of the mandrel ball to the second position 20, is 0.915-0.976.
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Inventors:
TAMURA SHOHEI (JP)
ARITA HIDEHIRO (JP)
ARITA HIDEHIRO (JP)
Application Number:
PCT/JP2018/005920
Publication Date:
August 30, 2018
Filing Date:
February 20, 2018
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
B21D9/03; B21D7/025
Foreign References:
| JPS6130226A | 1986-02-12 | |||
| JPS591026A | 1984-01-06 | |||
| JP2015131308A | 2015-07-23 |
Attorney, Agent or Firm:
BRIGHTAS IP ATTORNEYS (JP)
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