A segmental tube section structure having a length and a circumference, the segmental tube section structure including a plurality of tube segments extending the length in a longitudinal direction of the segmental tube section structure and extending in a circumferential direction of the segmental tube section structure, wherein each tube segment of the plurality of tube segments extends in the circumferential direction to span an equal arc of the circumference of the segmental tube section, and wherein each of the plurality of tube segments are connected to adjacent tube segments of the plurality of tube segments in the circumferential direction to form the segmental tube section structure.

A forging press apparatus includes: a die with a die hole into which a material is to be contained and a relief hole smaller in diameter than the die hole; a molding punch configured to press an inner portion inside a peripheral portion of the material contained in the die hole; and a pressing member provided around an outer periphery of the molding punch to press the peripheral portion. A method includes: loading the material into the die; and forging the cup structure shaped by pressing the inner portion inside the peripheral portion of the material with the molding punch to cause the peripheral portion of the material to be brought into contact with the pressing member, and a part of the material to be pushed out into the relief hole by the molding punch to form a projection while a space is secured below the projection.

A forging press apparatus includes: a die with a die hole into which a material is to be contained and a relief hole smaller in diameter than the die hole; a molding punch configured to press an inner portion inside a peripheral portion of the material contained in the die hole; and a pressing member provided around an outer periphery of the molding punch to press the peripheral portion. A method includes: loading the material into the die; and forging the cup structure shaped by pressing the inner portion inside the peripheral portion of the material with the molding punch to cause the peripheral portion of the material to be brought into contact with the pressing member, and a part of the material to be pushed out into the relief hole by the molding punch to form a projection while a space is secured below the projection.

A primary beverage container includes a container body (102) and a container end (230). The container body includes an outer wall (104) and an inner wall (106). The outer wall defines an outer cavity (116), and the inner wall defines an inner cavity (122) with an opening (124) at a top end (108) of the container body. The inner wall is positioned within the outer cavity such that between the top end and a bottom end of the container body, the inner wall is spaced apart from the outer wall within the outer cavity. The container end is joined to the top end of the container body and covers the opening of the inner cavity.

The present invention discloses a current-assisted composite spinning forming device and method for deep cup-shaped thin-walled parts is provided, comprising a spinning mandrel, a tailstock, and a plurality of rollers evenly distributed on the circumference of the spinning mandrel; the rollers are arranged in a staggered manner in the axial and radial directions of the spinning mandrel, and the roller surface of each roller comprises a deep drawing roller surface, a flow spinning section, and a shaping roller surface, wherein the staggered arrangement means that the deep drawing roller surfaces, the flow spinning sections and the shaping roller surfaces of the rollers are distributed in a staggered manner in the axial and radial directions of the spinning mandrel. In the spinning process, with different arc-shaped surface shapes and structures of the rollers for deep drawing spinning, the rollers focus on applying pressure to different portions of a blank in the period of each revolution of the spinning mandrel, which is beneficial to increase the pass reduction and reduce the spinning pass. This can not only improve the production efficiency, but also contribute to reducing defects such as material rupture and unusability due to hardening of the workpiece that is caused by the discontinuous material forming process.

The present invention discloses a current-assisted composite spinning forming device and method for deep cup-shaped thin-walled parts is provided, comprising a spinning mandrel, a tailstock, and a plurality of rollers evenly distributed on the circumference of the spinning mandrel; the rollers are arranged in a staggered manner in the axial and radial directions of the spinning mandrel, and the roller surface of each roller comprises a deep drawing roller surface, a flow spinning section, and a shaping roller surface, wherein the staggered arrangement means that the deep drawing roller surfaces, the flow spinning sections and the shaping roller surfaces of the rollers are distributed in a staggered manner in the axial and radial directions of the spinning mandrel. In the spinning process, with different arc-shaped surface shapes and structures of the rollers for deep drawing spinning, the rollers focus on applying pressure to different portions of a blank in the period of each revolution of the spinning mandrel, which is beneficial to increase the pass reduction and reduce the spinning pass. This can not only improve the production efficiency, but also contribute to reducing defects such as material rupture and unusability due to hardening of the workpiece that is caused by the discontinuous material forming process.

A manufacturing method of a stainless-steel-made base member includes a first step of forming, from a stainless-steel-made first cup-shaped member held at an inside portion thereof by a holding member, a second cup-shaped member made thinner than the first cup-shaped member by ironing an outside portion of the first cup-shaped member with a ring-shaped member movable in a longitudinal direction of the holding member; a second step of extracting the second cup-shaped member out of the holding member; and a third step of cutting a bottom end portion of the second cup-shaped member with respect to the longitudinal direction. The first cup-shaped member has Vickers hardness of not less than 200 HV0.3/10 or more and not more than 280 HV0.3/10, and the holding member has Vickers hardness which is not less than four times and not more than nine times the Vickers hardness of the first cup-shaped member.

A manufacturing method of a stainless-steel-made base member includes a first step of forming, from a stainless-steel-made first cup-shaped member held at an inside portion thereof by a holding member, a second cup-shaped member made thinner than the first cup-shaped member by ironing an outside portion of the first cup-shaped member with a ring-shaped member movable in a longitudinal direction of the holding member; a second step of extracting the second cup-shaped member out of the holding member; and a third step of cutting a bottom end portion of the second cup-shaped member with respect to the longitudinal direction. The first cup-shaped member has Vickers hardness of not less than 200 HV0.3/10 or more and not more than 280 HV0.3/10, and the holding member has Vickers hardness which is not less than four times and not more than nine times the Vickers hardness of the first cup-shaped member.

A can end including a central panel and a coined rivet disposed on the central panel. A press, a station, and/or a tooling assembly structured to form a coined rivet as well as a method to form the coined rivet is also provided.

A can end including a central panel and a coined rivet disposed on the central panel. A press, a station, and/or a tooling assembly structured to form a coined rivet as well as a method to form the coined rivet is also provided.