Abstract: A circular saw blade for metal cutting includes a disk-shaped base metal, a plurality of circumferentially-spaced gullets opening radially outward at an outer periphery of the base metal, a plurality of tip-receiving seats recessed at rear ends of the gullets relative to a rotational direction of the circular saw blade. The circular saw blade also includes cutting tips mounted to the base metal within the tip-receiving seats and protruding radially outward from the base metal. A thickness of each cutting tip is greater than a thickness of the base metal. Each cutting tip has a thin portion on a radially inner side of the cutting tip that is thinner than or equal to a thickness of the base metal. The thin portion is located within a thickness of each of the tip-receiving seats in the thickness direction.

Abstract: An ignition coil for an internal combustion engine includes an iron core, a primary coil disposed around the iron core, a secondary coil disposed around the primary coil, and an insulating portion sealing the iron core, the primary coil, and the secondary coil. The insulating portion includes a resin and a linear aliphatic group-containing organic substance, and has a sea-island structure in which the organic substance is dispersed in a matrix of the resin.

Abstract: There is provided a method of manufacturing an outwardly flanged metal member, by which a metal member having outward flange portions which extend radially outwardly from a plurality of positions along a circumferential direction on an outer peripheral surface can be formed without a flash, or with a reduced amount of a flash. While surrounding a periphery of a metal blank 15 by a stationary die 21 and a movable die 22 and butting a distal face of the movable die 22 and a distal face of the stationary die 21, an axial end face of the blank 15 is plastically deformed by pressing the axial end face with the punch under a warm or hot condition to form the outward flange portions 7a by filling flange molding cavities 32 with a portion of the blank 15.

Abstract: There is provided a method of manufacturing an outwardly flanged metal member, by which a metal member having outward flange portions which extend radially outwardly from a plurality of positions along a circumferential direction on an outer peripheral surface can be formed without a flash, or with a reduced amount of a flash. While surrounding a periphery of a metal blank 15 by a stationary die 21 and a movable die 22 and butting a distal face of the movable die 22 and a distal face of the stationary die 21, an axial end face of the blank 15 is plastically deformed by pressing the axial end face with the punch under a warm or hot condition to form the outward flange portions 7a by filling flange molding cavities 32 with a portion of the blank 15.

Abstract: A manufacturing method of a raceway ring for a radial ball bearing, the radial ball bearing has the raceway ring has at least one of an outer ring formed with an outer ring raceway, of which sectional shape is arcuate, and which is formed entire of circumference on an axially intermediate portion of an inner circumferential face as a raceway surface; and an inner ring formed with an inner ring raceway, of which sectional shape is arcuate, and which is formed entire of circumference on an axially intermediate portion of an outer circumferential face as the raceway surface and plurality of balls rollably provided between the inner ring raceway and the outer ring raceway.

Abstract: A double head supporting mechanism for a magnetic disk drive including an arm body and a carriage. The arm body includes an upper arm and a lower arm which are supported at their rear ends in a mutually rotatable manner. Both arms support an upper head and a lower head, respectively. Both of these heads hold a magnetic disk from both sides, at a mutually facing position, by having the magnetic disk inserted between them. The carriage is able to make reciprocal movement along the direction of the disk diameter. The arm body is held on its rear end side by the carriage in such a manner that it can swing freely by means of a common supporting spring. Both heads are constructed with a design so that they can follow the vertical deviation of the magnetic disk caused during rotation of the disk. The carriage is provided with a stopper to stop the lower arm from moving excessively.