Manufacturing method and manufacturing device of structural member
AssigneeNippon Steel Corporation
InventorsRyo Tabata, Yasuhiro Ito
Life of this patent
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Abstract
This manufacturing method of a structural member includes an intermediate step and a bending step. A height difference is provided on a bottom wall of a groove part between an intermediate position and both end positions sandwiching the intermediate position therebetween in a longitudinal sectional view in an extending direction of the groove part by the pressing in the intermediate step, and thereby at least one of a first curved part which has a concave curved shape in a plan view and a convex curved shape in the longitudinal sectional view and a second curved part which has a convex curved shape in the plan view and a concave curved shape in the longitudinal sectional view is formed on the bottom wall.
Claims16
A manufacturing method of a structural member which is a method for manufacturing a structural member including a top plate part having a curved edge and a curved reinforcing part which is formed integrally with the top plate part in an extending direction of the curved edge and in which a cross section perpendicular to the extending direction of the curved edge has a closed cross-sectional shape or an open cross-sectional shape from a flat plate material, the manufacturing method of a structural member comprising:
- an intermediate step of forming a groove part and a vertical wall part which is continuous with the groove part along a portion of the flat plate material that will become the curved edge by pressing a second portion continuous with a first portion in a direction intersecting a surface of the flat plate material with the first portion of the flat plate material corresponding to the top plate part sandwiched;
- and
- a bending step of bending an upper end edge of the vertical wall part toward the top plate part by pushing down the upper end edge toward the groove part while movement thereof toward the top plate part is allowed after the intermediate step, wherein
- a height difference is provided on a bottom wall of the groove part between an intermediate position and both end positions sandwiching the intermediate position therebetween in a longitudinal sectional view in an extending direction of the groove part by the pressing in the intermediate step, and thereby
- at least one of a first curved part which has a concave curved shape in a plan view and a convex curved shape in the longitudinal sectional view and a second curved part which has a convex curved shape in the plan view and a concave curved shape in the longitudinal sectional view is formed on the bottom wall.
A manufacturing device of a structural member which is a device for manufacturing a structural member including a top plate part having a curved edge and a curved reinforcing part which is formed integrally with the top plate part in an extending direction of the curved edge and in which a cross section perpendicular to the extending direction of the curved edge has a closed cross-sectional shape from a flat plate material, the manufacturing device of a structural member comprising:
- a first die on which a first die groove curved in a plan view is formed;
- a first punch which moves relatively closer to and further away from the first die groove;
- a second die having a second die groove which is thinner than the first die groove in a plan view;
- a first holder including a curved convex part having a shape corresponding to the second die groove;
- a second punch having a second vertical wall surface disposed to face a first vertical wall surface of the first holder at a distance of 5 mm or more and 50 mm or less in a horizontal direction in a plan view and configured to move relatively closer to and further away from the second die groove;
- a second holder disposed to overlap the second die;
- and
- a pad having a pressurizing surface which moves closer to and further away from the second die groove, wherein
- a bottom surface of the first die groove has a height difference between an intermediate position and both end positions sandwiching the intermediate position therebetween in a longitudinal sectional view in an extending direction of the first die groove,
- a pressurizing surface of the first punch has a height difference corresponding to that of the bottom surface of the first die groove,
- the bottom surface of the first die groove includes at least one of a first die curved surface which has a concave curved shape in the plan view and a convex curved shape in the longitudinal sectional view and a second die curved surface which has a convex curved shape in the plan view and a concave curved shape in the longitudinal sectional view, and
- a gap at a bottom dead center of forming with respect to a first top plate support surface of the second die is larger on the pressurizing surface of the pad than on a pressurizing surface of the second holder.
A manufacturing device of a structural member which is a device for manufacturing a structural member including a top plate part having a curved edge and a curved reinforcing part which is formed integrally with the top plate part in an extending direction of the curved edge and in which a cross section perpendicular to the extending direction of the curved edge has an open cross-sectional shape from a flat plate material, the manufacturing device of a structural member comprising:
- a third die having a second top plate support surface which includes a first die curved edge curved in a plan view;
- a third holder which moves closer to and further away from the second top plate support surface;
- a fourth die including a fourth die groove which is disposed adjacent to the first die curved edge in a plan view;
- a fourth punch which moves closer to and further away from the fourth die groove;
- a fifth die having a third top plate support surface which includes a second die curved edge curved in a plan view;
- a fourth holder which moves closer to and further away from the third top plate support surface;
- a fifth punch having a fourth vertical wall surface disposed to face a third vertical wall surface of the fourth holder at a distance of 5 mm or more and 50 mm or less in a horizontal direction in a plan view;
- a sixth die having a fourth top plate support surface which includes a third die curved edge curved in a plan view;
- a fifth holder which moves closer to and further away from the fourth top plate support surface;
- and
- a sixth punch having a pressurizing surface which overlaps a top of the third die curved edge in a plan view and configured to move closer to and further away from the sixth die, wherein
- a bottom surface of the fourth die groove has a height difference between an intermediate position and both end positions sandwiching the intermediate position therebetween in a longitudinal sectional view in an extending direction of the fourth die groove,
- a pressurizing surface of the fourth punch has a height difference corresponding to the bottom surface of the fourth die groove,
- the bottom surface of the fourth die groove includes at least one of a third die curved surface which has a concave curved shape in the plan view and a convex curved shape in the longitudinal sectional view and a fourth die curved surface which has a convex curved shape in the plan view and a concave curved shape in the longitudinal sectional view, and
- a gap at a bottom dead center of forming with respect to the fourth top plate support surface of the sixth die is larger on a pressurizing surface of the sixth punch than on a pressurizing surface of the fifth holder.
Dependencies are inferred from the claim text.