PLATE-SHAPED WORKPIECE FORMING METHOD, AND FORMED WORKPIECE

Title:

PLATE-SHAPED WORKPIECE FORMING METHOD, AND FORMED WORKPIECE

Document Type and Number:

WIPO Patent Application WO/2012/132791

Kind Code:

A1

Abstract:

A tip-bend forming method for machining pockets while a curved, plate-shaped workpiece is in a flattened state, without depending on novel machining equipment, wherein the curve radius of the plate-shaped workpiece after the pockets have been machined is prevented from becoming smaller than a completed curve radius due to spring-in. A plate-shaped workpiece (2) forming method for post-machining pockets (3) into the curved inner surface of the workpiece (2) while the plate-shaped workpiece (2), which has been curved by a curve-forming machine (10), is in a flattened state, the forming method having: a curve-forming step (A) for estimating in advance the amount that spring-in will cause the curve radius of the plate-shaped workpiece (2) to shrink after machining of the pockets (3) compared to before the machining thereof, setting a net curve radius (R0) obtained by adding a curve-radius shrinkage amount (R1) caused by spring-in to the completed curve radius (R) of the plate-shaped workpiece (2), and forming the curve in the plate-shaped workpiece (2) so as to achieve the net curve radius (R0); and a pocket-machining step for flattening the curved, plate-shaped workpiece (2), and post-machining pockets (3) therein.

Inventors:

SUGAI ATSUSHI (JP)
MATSUNAGA YU (JP)
OGURA DAISUKE (JP)
MORIMOTO SHOICHI (JP)
ARIMA MINORU (JP)
KANEDA YUICHI (JP)
EGAMI AKIHIKO (JP)

Application Number:

PCT/JP2012/055725

Publication Date:

October 04, 2012

Filing Date:

March 06, 2012

Export Citation:

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Assignee:

MITSUBISHI HEAVY IND LTD (JP)
SUGAI ATSUSHI (JP)
MATSUNAGA YU (JP)
OGURA DAISUKE (JP)
MORIMOTO SHOICHI (JP)
ARIMA MINORU (JP)
KANEDA YUICHI (JP)
EGAMI AKIHIKO (JP)

International Classes:

B21D53/92; B21D5/01; B23Q15/00; B21D5/02; B21D5/14

Foreign References:

JPH04158929A	1992-06-02
JP2009000736A	2009-01-08
JP2007508952A	2007-04-12

Other References: