A shell including a central panel with an expandable bubble disposed thereon is provided. The use of an expandable bubble allows for an expandable rivet button and thereafter an expandable rivet that has an enhanced overlap of a tab body. Such an expandable rivet allows for the use of a metal sheet with a thinner base thickness.

A metal sheet for press forming has a shape such that a boundary position between the region corresponding to the curved portion and an other region in the region corresponding to a curved portion is rotationally displaced in-plane around a rotational center set at a position on a curved recessed side rather than a position corresponding to a ridge line between a top sheet portion and a vertical wall portion on the curved recessed side, in a direction in which a line length of an outer edge of a position to be formed into the flange portion on a curved protruding side in the region corresponding to a curved portion approaches a line length of an outer edge of the flange portion on the curved protruding side in the press-formed component shape.

A metal sheet for press forming has a shape such that a boundary position between the region corresponding to the curved portion and an other region in the region corresponding to a curved portion is rotationally displaced in-plane around a rotational center set at a position on a curved recessed side rather than a position corresponding to a ridge line between a top sheet portion and a vertical wall portion on the curved recessed side, in a direction in which a line length of an outer edge of a position to be formed into the flange portion on a curved protruding side in the region corresponding to a curved portion approaches a line length of an outer edge of the flange portion on the curved protruding side in the press-formed component shape.

The present disclosure relates to a forging method and forging apparatus in which at front and rear portions of a workpiece, two products can be simultaneously shaped, thereby to improve a productivity of compression-shaping. The forging apparatus includes a press having upper and lower dies; a tray plate supply assembly configured to supply, by one pitch, a tray plate from one side of the press to an opposite side of the press along a middle portion between front and rear portions of a top of the lower die such that the tray plate can ascend and descend each time the upper die is raised; a punching unit disposed on the upper and lower dies at one side thereof to continuously form a workpiece fixing hole in the tray plate; a workpiece plate supply assembly disposed in front of an opposite side of the punching unit for feeding the workpiece plate by one pitch to a position below the workpiece fixing hole defined in the tray plate, wherein the workpiece plate supply assembly forms a through-protrusion to pass through the workpiece fixing hole on a front-rear directional middle portion in a portion of the workpiece plate corresponding to the fed one pitch; a cutting and pressing and fixing assembly provided on the upper and lower die at an opposite side of the punching unit for cutting the workpiece plate to be fed to the position below the workpiece fixing hole of the tray plate by one pitch and for pressing and fixing the through-protrusion formed on the middle portion of the cut workpiece into the workpiece fixing hole; and a pressing and shaping unit disposed on the upper and lower dies at an opposite side of the cutting and pressing and fixing assembly for compressing and shaping the fed workpiece.

The present disclosure relates to a forging method and forging apparatus in which at front and rear portions of a workpiece, two products can be simultaneously shaped, thereby to improve a productivity of compression-shaping. The forging apparatus includes a press having upper and lower dies; a tray plate supply assembly configured to supply, by one pitch, a tray plate from one side of the press to an opposite side of the press along a middle portion between front and rear portions of a top of the lower die such that the tray plate can ascend and descend each time the upper die is raised; a punching unit disposed on the upper and lower dies at one side thereof to continuously form a workpiece fixing hole in the tray plate; a workpiece plate supply assembly disposed in front of an opposite side of the punching unit for feeding the workpiece plate by one pitch to a position below the workpiece fixing hole defined in the tray plate, wherein the workpiece plate supply assembly forms a through-protrusion to pass through the workpiece fixing hole on a front-rear directional middle portion in a portion of the workpiece plate corresponding to the fed one pitch; a cutting and pressing and fixing assembly provided on the upper and lower die at an opposite side of the punching unit for cutting the workpiece plate to be fed to the position below the workpiece fixing hole of the tray plate by one pitch and for pressing and fixing the through-protrusion formed on the middle portion of the cut workpiece into the workpiece fixing hole; and a pressing and shaping unit disposed on the upper and lower dies at an opposite side of the cutting and pressing and fixing assembly for compressing and shaping the fed workpiece.

Provided is a method for manufacturing a tubular rotary component from a donut-shaped metal disc, wherein the generation of wrinkles or cracks due to a drawing process can be suppressed. This method for manufacturing a tubular rotary component 100B includes: an intermediate molding step in which the entirety of both surfaces of a donut-shaped metal disc 100 having a prescribed inner diameter D.sub.1 and outer diameter D.sub.2 are pressed by the respective tapered surfaces of a punch 10A and a die 20A provided with a prescribed taper to carry out bore-expansion drawing, thereby obtaining a frustoconical intermediate molded article 100A; and a final molding step in which the intermediate molded article 100A is pressed by a punch 10B and a die 20B having a desired shape to carry out bore-expansion drawing again, thereby obtaining a tubular rotary component 100B.

The present disclosure relates to a device with multiple coined areas having multiple mechanical properties, and systems and methods for manufacturing such a device. The device can include a central channel section with a spine and one or more legs, a flexible spring section extending from the spine at a first end of the channel section, and one or more compliant pins extending from the one or more legs at a second end of the central channel section. The device is integrally formed from a single piece of stock material having first mechanical properties and one or more of the spring section and the compliant pins are coined to produce one or more different mechanical properties.

A method for stamping and stacking sheet metal parts to form lamination stacks is disclosed. In order to facilitate the separation of joined sheet metal parts into lamination stacks, a second stamping-out of at least one second sheet metal part is performed in a step preceding the first stamping-out, as well as a pushing-back of the separating element into a region of the electrical steel strip from which the second sheet metal part has been stamped and a pushing-out of the separating element from the electrical steel strip with the first stamping-out.

A stock lifter for metal forming dies includes a self-contained assembly. The assembly includes a guide pin that reciprocates within a base. A hardened end cap, which contacts the stock, is attached to the guide pin. A spring is located on the exterior surface of a portion of the base and surrounds the guide pin body. One end of the spring contacts a surface on the cap, while the other end of the spring contacts a surface on the base or an optional mounting flange that is attached above the base. Thus, the stock lifter assembly has a hardened cap for the stock to slide on and a larger, externally mounted spring that provides longer life for the stock lifter. The stock lifter assembly can be made of several different lengths and sizes by using longer or wider guide pins and springs.

A stock lifter for metal forming dies includes a self-contained assembly. The assembly includes a guide pin that reciprocates within a base. A hardened end cap, which contacts the stock, is attached to the guide pin. A spring is located on the exterior surface of a portion of the base and surrounds the guide pin body. One end of the spring contacts a surface on the cap, while the other end of the spring contacts a surface on the base or an optional mounting flange that is attached above the base. Thus, the stock lifter assembly has a hardened cap for the stock to slide on and a larger, externally mounted spring that provides longer life for the stock lifter. The stock lifter assembly can be made of several different lengths and sizes by using longer or wider guide pins and springs.