Disclosed is a method to manufacture a pressed component from an intermediate stock, which includes two bent portions with a spacing thereof narrower than a width of a top plate of the pressed component, by employing a press including a die having a die pad and a punch having an inner pad, the method including: gripping a portion between the bent portions with the inner pad and the die pad in a state in which the inner pad projects from the punch and the die pad projects from the die; moving the die toward the punch side to form vertical walls of the pressed component with the die and the punch; and integrating the die and the die pad and then moving the die, the die pad and the inner pad toward the punch side to form the top plate.

To produce an L-shaped pressed component without causing occurrence of wrinkles or cracks through first to third steps: the first step where a portion of a blank 8, having tensile strength of 1180 MPa or more, to be formed into a portion disposed outward of a curved portion is held in a state of being clamped by a blank holder 73 and a die 71, and a portion of the blank 8 to be formed into a top plate 11 is held in a state of being clamped by a pad 74 and a punch 72; the second step where a vertical wall 14, a concave ridge 17 and a flange 15 on the inner side of a curved portion 1a are formed by bend forming with a bending die 75, thus forming one, two or more material inflow promoting portion, which increases an inflow amount of the blank 8 flowing into a portion to be formed into the flange 15 on the inner side of the curved portion 1a, in the vicinity of a portion of the blank 8 to be formed into the flange 15 on the inner side of the curved portion 1a of the pressed component 1; and the third step where the die 71 is moved in a direction toward a side where the blank holder 73 is disposed so as to form a vertical wall 12, a concave ridge 16, and a flange 13 on the outer side of the curved portion 1a by draw forming.

To produce an L-shaped pressed component without causing occurrence of wrinkles or cracks through first to third steps: the first step where a portion of a blank 8, having tensile strength of 1180 MPa or more, to be formed into a portion disposed outward of a curved portion is held in a state of being clamped by a blank holder 73 and a die 71, and a portion of the blank 8 to be formed into a top plate 11 is held in a state of being clamped by a pad 74 and a punch 72; the second step where a vertical wall 14, a concave ridge 17 and a flange 15 on the inner side of a curved portion 1a are formed by bend forming with a bending die 75, thus forming one, two or more material inflow promoting portion, which increases an inflow amount of the blank 8 flowing into a portion to be formed into the flange 15 on the inner side of the curved portion 1a, in the vicinity of a portion of the blank 8 to be formed into the flange 15 on the inner side of the curved portion 1a of the pressed component 1; and the third step where the die 71 is moved in a direction toward a side where the blank holder 73 is disposed so as to form a vertical wall 12, a concave ridge 16, and a flange 13 on the outer side of the curved portion 1a by draw forming.

Quality collars with long collar lengths, homogeneous wall thickness distributions, and high loadability even in high-strength materials such as steel can be achieved on workpieces according to the disclosed methods and devices. One example method involves drawing the workpiece such that the drawn workpiece has a flange region and a drawn region adjoining the flange region, wherein the drawn region has a wall region and a drawn base adjoining the wall region, with the wall region forming a part of the collar; punching the drawn base located in the drawn region of the workpiece such that a drawn-base subregion adjoins the wall region; expanding the drawn-base subregion such that the expanded drawn-base subregion forms a part of the collar; and at least partially ironing and/or expanding the collar.

Quality collars with long collar lengths, homogeneous wall thickness distributions, and high loadability even in high-strength materials such as steel can be achieved on workpieces according to the disclosed methods and devices. One example method involves drawing the workpiece such that the drawn workpiece has a flange region and a drawn region adjoining the flange region, wherein the drawn region has a wall region and a drawn base adjoining the wall region, with the wall region forming a part of the collar; punching the drawn base located in the drawn region of the workpiece such that a drawn-base subregion adjoins the wall region; expanding the drawn-base subregion such that the expanded drawn-base subregion forms a part of the collar; and at least partially ironing and/or expanding the collar.

A restraining material includes a frictional surface configured to press against an object to restrain the object and exert a frictional force thereon. The frictional surface is a pattern surface of a base material of the restraining member that will directly contact with the object. The pattern surface includes island-shaped parts separated by a depression and periodically arranged. The depression has a depth of 15 to 50 m with respect to the frictional surface. A periodic arrangement direction of the island-shaped parts includes a direction defined by that: a pattern index determined by dividing an arrangement pitch of the island-shaped parts in a periodic arrangement direction by the maximum diameter of each island-shaped part in the periodic arrangement direction falls within a range of 1.0 to 100, and the maximum diameter of each island-shaped part in the periodic arrangement direction falls within in a range of 0.1 to 2 mm.

A hat-shaped cross-section component manufacturing apparatus includes: a die that includes a forming face that grips and presses a metal stock sheet; a blank holder, that includes a forming face that grips and presses the metal stock sheet so as to configure a forming face corresponding to the forming face of the die, a pad that is disposed inside the opening formed in the die, and that includes a forming face that grips and presses the metal stock sheet; and a punch that is disposed facing the pad and that includes a forming face that grips and presses the metal stock sheet so as to configure a forming face corresponding to the forming face of the pad. The hat-shaped cross-section component manufacturing apparatus further includes a pressure limiting device that limits a formed curving component from being pressed between the pad and the blank holder during demolding.

A hat-shaped cross-section component manufacturing apparatus includes: a die that includes a forming face that grips and presses a metal stock sheet; a blank holder, that includes a forming face that grips and presses the metal stock sheet so as to configure a forming face corresponding to the forming face of the die, a pad that is disposed inside the opening formed in the die, and that includes a forming face that grips and presses the metal stock sheet; and a punch that is disposed facing the pad and that includes a forming face that grips and presses the metal stock sheet so as to configure a forming face corresponding to the forming face of the pad. The hat-shaped cross-section component manufacturing apparatus further includes a pressure limiting device that limits a formed curving component from being pressed between the pad and the blank holder during demolding.

This method for manufacturing a panel-like formed article has preparing a blank material made of a metal sheet having a tensile strength of 390 MPa or more and 980 MPa or less; and press-forming the blank material in a cold manner using a pressing apparatus to form the blank material into the panel-like formed article, in the press-forming, a blank holder, a first punch, and a second punch are relatively moved with respect to a die, thereby pressing the first punch and the second punch to the blank material, and pressing of the second punch to the blank material is completed before pressing of the first punch to the blank material.

This method for manufacturing a panel-like formed article has preparing a blank material made of a metal sheet having a tensile strength of 390 MPa or more and 980 MPa or less; and press-forming the blank material in a cold manner using a pressing apparatus to form the blank material into the panel-like formed article, in the press-forming, a blank holder, a first punch, and a second punch are relatively moved with respect to a die, thereby pressing the first punch and the second punch to the blank material, and pressing of the second punch to the blank material is completed before pressing of the first punch to the blank material.