The present disclosure relates to a method for producing a shaped sheet metal component from a billet by means of U O forming, wherein firstly a preform is created by the U-forming and then a final shaping is performed by the O forming to give a final form.

The present disclosure relates to a method for producing a shaped sheet metal component from a billet by means of U O forming, wherein firstly a preform is created by the U-forming and then a final shaping is performed by the O forming to give a final 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 method for bending an electrode tab is disclosed herein. The method may include: stacking an electrode and an separator to form an electrode assembly, connecting an electrode lead to an electrode tab protruding from the electrode assembly, primarily bending the electrode tab by moving a bending block disposed at one side of the electrode tab in a first direction directed toward the other side of the electrode tab, and secondarily bending the electrode tab by moving the bending block in a second direction different from the first direction.

A method for manufacturing a pipe includes: press-forming a plate member into a U shape; and press-forming the plate member formed into the U shape into an O shape. The pipe includes a pipe body and a tapered part tilted radially inward and protruding from one end of the pipe body. Before the plate member is press-formed into the U shape, a boundary between a portion of the plate member corresponding to the pipe body and a portion of the plate member corresponding to the tapered part is pressed from a surface of the plate member corresponding to an inner peripheral surface of the pipe to bend the portion of the plate member corresponding to the tapered part toward the surface of the plate member corresponding to the inner peripheral surface of the pipe.

A die set capable of suppressing breakage or wrinkling of the workpiece during bending and a processing method using the die set. A die set used for bending a plate-like workpiece includes a lower die on which the workpiece is placed, and an upper die having a pressing surface formed to press the workpiece against the lower die. The lower die includes a lower movable part slidable in the same direction as a moving direction of the upper die, a reaction force generating member configured to elastically support the lower movable part from beneath, and receiving members located on both sides of the lower movable part. The pressing surface has an arc-shaped cross-section protruding toward the lower die and extends in a longitudinal direction of the workpiece. The maximum push-in position of the lower end portion of the pressing surface is deeper than a position lowered by a finished inner diameter dimension of the workpiece from an upper surface of the lower die.

A manufacturing apparatus for a hat-shaped cross-section component includes a die having first molding surfaces, a pad having a second molding surface, a punch having a third molding surface, a holder having fourth molding surfaces, and a first restraint portion. An upright wall is molded between a top and each of flanges by moving the pad and the punch relative to the die and the holder, or moving the die and the holder relative to the pad and the punch. The first restraint portion is configured to, during a period from when a top forming part is sandwiched by the second molding surface and the third molding surface to when the upright walls are molded, suppress displacement of the top forming part in a longitudinal direction of the top forming part relative to the second molding surface and the third molding surface.

A manufacturing apparatus for a hat-shaped cross-section component includes a die having first molding surfaces, a pad having a second molding surface, a punch having a third molding surface, a holder having fourth molding surfaces, and a first restraint portion. An upright wall is molded between a top and each of flanges by moving the pad and the punch relative to the die and the holder, or moving the die and the holder relative to the pad and the punch. The first restraint portion is configured to, during a period from when a top forming part is sandwiched by the second molding surface and the third molding surface to when the upright walls are molded, suppress displacement of the top forming part in a longitudinal direction of the top forming part relative to the second molding surface and the third molding surface.

A long formed article made of one steel sheet includes a top sheet portion extending in a longitudinal direction, a standing wall portion extending downward from each of both edges of the top sheet portion in a width direction, and a protrusion portion formed in a portion of the top sheet portion in the longitudinal direction by overlapping a portion extending toward an outside from each of both ends of the top sheet portion in the width direction and a portion extending toward the outside from an upper end of the standing wall portion, in a non-protrusion region, a recessed part extending in the longitudinal direction is formed in the top sheet portion, and a total value α of inner surface peripheral lengths of the top sheet portion and the standing wall portion in a cross section of the formed article perpendicular to the longitudinal direction in a protrusion region and a total value β of inner surface peripheral lengths of the top sheet portion, the standing wall portion, and the recessed part in the cross section of the formed article perpendicular to the longitudinal direction in the non-protrusion region satisfy 1.01≤β/α≤1.50.