Abstract:
A method for manufacturing a gear includes providing a rim gear, a hub and a core wherein the core is annular and has a core forging temperature below a hot hardness temperature of the rim gear and the hub. The rim gear and the hub are rotated about an axis relative to the core. During the relative rotation, the rim gear and the hub are in contact with the core to generate friction heat to raise an interface temperature of the core to the core forging temperature. The hub is driven into the core to upset a first portion of the core into an outer annular groove defined in a first faying surface of the hub. The rim gear is driven over the core to upset a second portion of the core into an inner annular groove defined in a second faying surface of the rim gear.
Abstract:
PROBLEM TO BE SOLVED: To provide a starter ring gear for a vehicle, which can suppress reduction in hardness of outer circumferential teeth which occurs during welding of a drive plate.SOLUTION: The starter ring gear for a vehicle includes a plurality of circumferential direction grooves 94 formed in the circumferential direction of the other side face 90 to be longer than a welding bead 92, which function as heat resisting parts for suppressing conduction of heat of welding with the drive plate 26 to outer circumferential teeth 44a on, between the inner peripheral surface of the starter ring gear 44 and the tooth surface of the outer circumferential teeth 44a, on a plurality of welding parts with the drive plate 26, namely, on the outer circumferential side of the welding bead 92. Thus, since annealing of the outer circumferential teeth 44a of the starter gear 44 increased in hardness by high-frequency hardening welding of the starter gear 44 and the drive plate 26 is suppressed, reduction in hardness of the outer circumferential teeth 44a near the welding part by welding with the drive plate 26 is suppressed.
Abstract:
A method of manufacturing a mechanical part of the present invention includes a first process of forming, by performing a folding processing to an end portion of the material, a portion to be processed having a structure, in which a plurality of layers respectively having a thickness corresponding to a plate thickness of a material overlap each other, in the material such that a plate thickness direction of the layer is orthogonal to a plate thickness direction of the material; and a second process of changing, by performing a forging processing to the portion to be processed, a shape of the portion to be processed to a target shape while press-welding the layers of the portion to be processed to each other by plastic deformation.
Abstract:
Letting the direction in which a first member (10) and a second member (12) are arranged be a first direction and a direction orthogonal to the first direction be a second direction, this welding structure has: a pressure fit part (26); a first hollow part (32); a second hollow part (34); a first weld bead (20) formed between an end, which is on a joining part of the first member (10) and the second member (12) on one side in the second direction, and the first hollow part (32) by welding the first member (10) and second member (12) in a state in which the outside and the second hollow part (32) are linked; a second weld bead (22) formed between an end, which is on a joining part of the first member (10) and the second member (12) on the other side in the second direction, and the second hollow part (34); and a cutout groove (42) linking the first hollow part (32) and the second hollow part (34).
Abstract:
It is a task of the present application to provide a butt position detecting method for a weld joint and a butt position detecting device for a weld joint that can detect a position of a butt portion between both members with high accuracy while reducing costs, and a manufacturing a weld joint that carries out the butt position detecting method. Thus, according to one aspect of the invention, in a butt position detecting method for a weld joint, when an arrangement direction of a first member and a second member is defined as a first direction, and a direction that is perpendicular to the first direction is defined as a second direction, the first member has a corner portion and a chamfer portion, and a two-dimensional displacement sensor is arranged at a position offset from the butt portion toward the first member side in the first direction, and such that an angle θs at which the second direction and an optical axis direction of irradiation light of the two-dimensional displacement sensor intersect with each other and an angle θa at which the second direction and a formation direction of the chamfer portion of the first member intersect with each other satisfy a condition expression: 0°