A catalytic converter includes: a tubular casing including at least a pair of holding tubular parts and a reduced diameter tubular part that integrally connects the holding tubular parts to each other; and a monolithic catalyst carrier accommodated in each of the holding tubular parts, the reduced diameter tubular part being obtained by press-forming a portion, between the holding tubular parts, of a casing material of a tubular shape that corresponds to that of the holding tubular parts. Flat parts are formed respectively in a plurality of places at intervals in a peripheral direction of the reduced diameter tubular part, a sensor being attached to at least one of the flat parts. Accordingly, a press load when press-forming the reduced diameter tubular part is suppressed from becoming large and unequal in the peripheral direction of the reduced diameter tubular part.

A composite core with non-traditional geometries includes multiple elongate tubes arranged in a two-dimensional array. Each tube is made of a composite material. Each tube includes multiple curved sides. Each curved side inwardly curves toward a longitudinal axis passing through a geometric center of the tube to form a valley on an outer surface of the tube. An end of a first curved side connects to an end of a second curved side to form a crest on the outer surface of the tube. At least one crest formed on an outer surface of a first tube in the two-dimensional array contacts at least one valley formed on an outer surface of an adjacent second tube in the two-dimensional array.

A composite core with non-traditional geometries includes multiple elongate tubes arranged in a two-dimensional array. Each tube is made of a composite material. Each tube includes multiple curved sides. Each curved side inwardly curves toward a longitudinal axis passing through a geometric center of the tube to form a valley on an outer surface of the tube. An end of a first curved side connects to an end of a second curved side to form a crest on the outer surface of the tube. At least one crest formed on an outer surface of a first tube in the two-dimensional array contacts at least one valley formed on an outer surface of an adjacent second tube in the two-dimensional array.

A catalytic converter includes: a tubular casing including at least a pair of holding tubular parts and a reduced diameter tubular part that integrally connects the holding tubular parts to each other; and a monolithic catalyst carrier accommodated in each of the holding tubular parts, the reduced diameter tubular part being obtained by press-forming a portion, between the holding tubular parts, of a casing material of a tubular shape that corresponds to that of the holding tubular parts. Flat parts are formed respectively in a plurality of places at intervals in a peripheral direction of the reduced diameter tubular part, a sensor being attached to at least one of the flat parts. Accordingly, a press load when press-forming the reduced diameter tubular part is suppressed from becoming large and unequal in the peripheral direction of the reduced diameter tubular part.

A catalytic converter includes: a tubular casing including at least a pair of holding tubular parts and a reduced diameter tubular part that integrally connects the holding tubular parts to each other; and a monolithic catalyst carrier accommodated in each of the holding tubular parts, the reduced diameter tubular part being obtained by press-forming a portion, between the holding tubular parts, of a casing material of a tubular shape that corresponds to that of the holding tubular parts. Flat parts are formed respectively in a plurality of places at intervals in a peripheral direction of the reduced diameter tubular part, a sensor being attached to at least one of the flat parts. Accordingly, a press load when press-forming the reduced diameter tubular part is suppressed from becoming large and unequal in the peripheral direction of the reduced diameter tubular part.

A tool configured to form four evenly spaced indentations having an indentation radius and four evenly spaced projections about a circumference of a generally cylindrical seamless ferrule having a ferrule radius. Each projection of the four projections has a projection height equal to or less than a height threshold. The tool includes four crimping dies. Each crimping die of the four crimping dies defines a concave crimping surface having the indentation radius. The tool also includes four limiting dies. Each limiting die is located intermediate two adjacent crimping dies of the four crimping dies. Each limiting die defines a limiting surface that is configured to limit a height of each projection to the height threshold.

A tool configured to form four evenly spaced indentations having an indentation radius and four evenly spaced projections about a circumference of a generally cylindrical seamless ferrule having a ferrule radius. Each projection of the four projections has a projection height equal to or less than a height threshold. The tool includes four crimping dies. Each crimping die of the four crimping dies defines a concave crimping surface having the indentation radius. The tool also includes four limiting dies. Each limiting die is located intermediate two adjacent crimping dies of the four crimping dies. Each limiting die defines a limiting surface that is configured to limit a height of each projection to the height threshold.

A method for producing a corrugated foil bearing stiffener involves starting with an austenitic nickel superalloy sheet (15) having an elasticity limit higher than 500 MPa, and subjecting the sheet (15) to at least one step of press bending plastic deformation of the entire thickness of same with a deformation energy higher than 10 kJ in a time shorter than 10.sup.5 s in such a way as to create corrugations.

A method for producing a corrugated foil bearing stiffener involves starting with an austenitic nickel superalloy sheet (15) having an elasticity limit higher than 500 MPa, and subjecting the sheet (15) to at least one step of press bending plastic deformation of the entire thickness of same with a deformation energy higher than 10 kJ in a time shorter than 10.sup.5 s in such a way as to create corrugations.

The present invention relates to a device for forming a round bar into variable shapes, comprising: a main body provided with a plate portion with a circular shape having a plate hole formed in a center thereof, having plate protrusions protruding to the plate portion in a radial shape, and a turn gear connecting portion formed at an outer circumference surface of the plate portion; a round bar forming portion coupled between the plate protrusions and having a slide mold seated on the plate portion and a forming roll coupled to the slide mold to rotate; and a turn gear having a donut shape, provided with a turn gear protruding portion with a circular arc shape having different diameters from a center in an inner surface thereof, and disposed between the slide mold and the turn gear connecting portion.