A panel-shaped formed product made of a metal sheet includes a top panel portion, an opening portion, and a vertical wall portion. The top panel portion is polygonal. The opening portion is provided in the top panel portion. The vertical wall portion extends from at least not less than two adjacent borders among the borders of the top panel portion. At least one pair of each vertical wall portion of pairs of adjacent vertical wall portions of the vertical wall portions has a stepped portion. As a result, the panel shaped formed product has fewer defects such as cracks and wrinkles even when it has a shape that is difficult to form.

A method for producing a press-formed product that includes a pair of flat sections and a bend section that connects the flat sections, in which a bending radius of the bend section is R.sub.2 and an interior angle formed by the pair of flat sections is θ.sub.2, includes the steps bellow. In the first forming step, an intermediate formed product including a bend section in which a bending radius is R.sub.1 and an interior angle is θ.sub.1 is formed. In the second forming step, a portion of a bend section of the intermediate formed product is formed into the bend section of the press-formed product. R.sub.1, θ.sub.1, R.sub.2 and θ.sub.2 satisfy the conditions of Formulae (1) to (3) below:

1.05<A.sub.1/A.sub.2   (1);

1.0<R.sub.1/R.sub.2   (2);

A.sub.1/A.sub.2<6.0/(R.sub.1/R.sub.2)   (3), where, A.sub.1, A.sub.2 represents the supplementary angle of the interior angle θ.sub.1, θ.sub.2, respectively.

A method for producing a press-formed product that includes a pair of flat sections and a bend section that connects the flat sections, in which a bending radius of the bend section is R.sub.2 and an interior angle formed by the pair of flat sections is θ.sub.2, includes the steps bellow. In the first forming step, an intermediate formed product including a bend section in which a bending radius is R.sub.1 and an interior angle is θ.sub.1 is formed. In the second forming step, a portion of a bend section of the intermediate formed product is formed into the bend section of the press-formed product. R.sub.1, θ.sub.1, R.sub.2 and θ.sub.2 satisfy the conditions of Formulae (1) to (3) below:

1.05<A.sub.1/A.sub.2   (1);

1.0<R.sub.1/R.sub.2   (2);

A.sub.1/A.sub.2<6.0/(R.sub.1/R.sub.2)   (3), where, A.sub.1, A.sub.2 represents the supplementary angle of the interior angle θ.sub.1, θ.sub.2, respectively.

A welding structure of a press-formed part made by combining and joining two parts formed by press-forming and each having an opening portion on at least one side of a cross-section, while the opening portions face each other, and includes a step portion that is provided by forming a bent projection projecting outwardly on a tip end portion of a side wall portion of a lower side part, partially or entirely on a joining surface. A tip end side of the step portion is fitted into the opening portion of an upper side part, and the step portion of the lower side part and the tip end of a side wall portion of the upper side part are linearly joined by arc welding.

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.

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.

A manufacturing a container makes it possible to easily manufacture a container including a body portion with a shape that expands outward toward an upper face side. A method for manufacturing a container according to the disclosure is a method for manufacturing a container made of metal, including a bottom portion and a body portion, open on the upper face side, and having a shape in which the body portion expands outward toward the upper face side. The method includes a bottom drawing step of reducing a diameter of a cup body made of metal and having a bottomed cylindrical shape by operating a diameter reducing die having a hole portion with a smaller diameter than an outer diameter of the cup body along a cylindrical axis direction from a bottom side, in which the bottom drawing step is repeated a plurality of times.

A method of manufacturing a can body includes: molding a preform of a can including: molding a dome part on a bottom of a bottomed cylindrical body, the dome part being concave into the bottomed cylindrical body; and molding as annular leg part projecting in a direction opposite to a direction in which the dome part is concave, the leg part including an inner peripheral section which is inclined from a ground point of the leg part toward a can axis in a vertical cross-sectional view taken along the can axis; painting at least one of an inner surface and an outer surface of the preform of the can; and bottom reforming to mold a molded can including a curved end around the dome part by pressing an inner surface of the dome part of the preform of the can painted by the painting.

A method of manufacturing a can body includes: molding a preform of a can including: molding a dome part on a bottom of a bottomed cylindrical body, the dome part being concave into the bottomed cylindrical body; and molding as annular leg part projecting in a direction opposite to a direction in which the dome part is concave, the leg part including an inner peripheral section which is inclined from a ground point of the leg part toward a can axis in a vertical cross-sectional view taken along the can axis; painting at least one of an inner surface and an outer surface of the preform of the can; and bottom reforming to mold a molded can including a curved end around the dome part by pressing an inner surface of the dome part of the preform of the can painted by the painting.

The present invention is a press forming method for obtaining a target formed article that has an edge-shaped ridge section and that has a negative surface on one side and a positive surface on the other side with respect to the ridge section as a border, said press forming method including: a first step for forming an intermediate formed article having an intermediate ridge section having a larger radius than the edge radius of the ridge section; and a second step for forming the target formed article from the intermediate formed article. The intermediate formed article has a first intermediate positive surface that corresponds to the site extending from the ridge section to the negative surface of the target formed article and also has a second intermediate positive surface that corresponds to the site extending from the ridge section to the positive surface of the target formed article and that continues from the first intermediate positive surface and an intermediate negative surface continuing from the second intermediate positive surface.