Abstract: A method and an apparatus for grinding an axial workpiece are capable of removing a turning lead portion of an axial workpiece having an oil seal fit portion on its outer circumferential surface by grinding without any grinding fluid. The apparatus includes a headstock of a lathe for rotatably supporting an axial workpiece about its axis, the workpiece having an oil seal fit portion on its outer circumferential surface, and a slide mount disposed so as to be radially movable with respect to a tool turret of the lathe. The apparatus also includes an air cylinder for moving the slide mount back and forth in alignment with the axis of the headstock, an elastic grinding stone wheel rotatably attached to the slide mount to be movable radially back and forth with respect to the oil seal fit portion by the slide mount being moved, and a brushless motor for rotating the elastic grinding stone wheel.

Abstract: In cutting the braking surface of a brake rotor-equipped wheel bearing device, which includes an outer member having a car body attaching flange in the outer periphery, an inner member having a wheel attaching flange in the outer periphery, a plurality of rows of rolling bodies incorporated between the two members and rotatably supporting the inner member, and a brake rotor attached to the wheel attaching flange, the cutting is performed such that subsequently to assembling the wheel bearing device in its mounted state, the end surface of a wheel pilot formed in the inner member is finish-cut. The brake rotor is then attached to the wheel attaching flange, whereupon the braking surface of the brake rotor is cut with the outer diameter of the wheel pilot gripped relative to the end surface of the wheel pilot.

Abstract: A method and an apparatus for grinding an axial workpiece are provided, which are capable of removing a turning lead portion of an axial workpiece having an oil seal fit portion on its outer circumferential surface by grinding without any grinding fluid. The apparatus for grinding an axial workpiece includes: a headstock of a lathe for rotatably supporting an axial workpiece about its axis, the workpiece having an oil seal fit portion on its outer circumferential surface; a slide mount disposed so as to be radially movable with respect to a tool turret of the lathe; an air cylinder for moving the slide mount back and forth in alignment with the axis of the headstock; an elastic grinding stone wheel rotatably attached to the slide mount to be movable radially back and forth with respect to the oil seal fit portion by the slide mount being moved; and a brushless motor for rotating the elastic grinding stone wheel.

Abstract: In cutting the braking surface (13a) of a brake rotor-equipped wheel bearing device (A) which comprises an outer member (1) having a car body attaching flange (4) in the outer periphery, an inner member (2) having a wheel attaching flange (6) in the outer periphery, a plurality of rows of rolling bodies (3) incorporated between the two members (1, 2) and rotatably supporting the inner member (2), and a brake rotor (13) attached to the wheel attaching flange (6), the cutting is performed such that subsequently to assembling the wheel bearing device in its mounted state, the end surface of a wheel pilot (9) formed in the inner member (2) is finish-cut, and then the brake rotor (13) is attached to the wheel attaching flange (6), whereupon the braking surface (13a) of the brake rotor (13) is cut with the outer diameter of the wheel pilot (9) gripped relative to the end surface of the wheel pilot (9).

Abstract: A cutting method which can efficiently cut braking surfaces of a brake rotor of a wheel bearing assembly. A reference surface on one side of a vehicle body-mounting flange provided on an outer member of the wheel bearing assembly is brought into abutment with positioning pieces of a positioning member, and a cylindrical outer peripheral surface of the outer member is clamped by a chuck device. By advancing pushrods of first and second pressing devices, a raceway member and a hub ring forming the inner member are pressed axially to put the assembly into an actual mounted state. The inner member and the brake rotor are rotated by rotating the pushrod of the second pressing device, and a cutting tool is moved in a direction parallel to the reference surface to cut the braking surfaces of the brake rotor.

Abstract: A cage having a plurality of pockets, and a pair of end faces of each pocket formed in the cage that oppose each other in a circumferential direction of the cage are formed by surfaces cut after hardening and their surface hardness is reduced to a value lower than the surface hardness of a pair of side faces of each pocket that oppose each other in an axial direction of the cage to impart toughness to the bridge portions defined between the pockets and thus to increase the strength of the cage.

Abstract: A cutting method which can efficiently cut braking surfaces of a brake rotor of a wheel bearing assembly. A reference surface on one side of a vehicle body-mounting flange provided on an outer member of the wheel bearing assembly is brought into abutment with positioning pieces of a positioning member, and a cylindrical outer peripheral surface of the outer member is clamped by a chuck device. By advancing pushrods of first and second pressing devices, a raceway member and a hub ring forming the inner member are pressed axially to put the assembly into an actual mounted state. The inner member and the brake rotor are rotated by rotating the pushrod of the second pressing device, and a cutting tool is moved in a direction parallel to the reference surface to cut the braking surfaces of the brake rotor.

Abstract: It is proposed to increase the strength of a cage of a constant-velocity joint. A pair of end faces of each pocket formed in the cage that oppose each other in a circumferential direction of the cage are formed by surfaces cut after hardening and their surface hardness is reduced to a value lower than the surface hardness of a pair of side faces of each pocket that oppose each other in an axial direction of the cage to impart toughness to the bridge portions defined between the pockets and thus to increase the strength of the cage.

Abstract: In a lathe of a type employing a movable main spindle, the main spindle (2) is moved in a leftward and rightward direction (Y-axis direction) perpendicular to the longitudinal axis of the main spindle (2) after a workpiece (W) has been machined, and during the movement of the main spindle (2), the machined workpiece (W) is unloaded from the main spindle (2). At a position to which the main spindle (2) has further been moved, another workpiece (W) to be subsequently machined is loaded on the main spindle (2). The unloading of the machined workpiece (W) is carried out by a method in which the machined workpiece (W) is ejected by a workpiece eject means (7) built in a chuck (2a) in the main spindle (2).