Cup-shaped part with inner peripheral uneven surface section, method for manufacturing cup-shaped part, and device for manufacturing cup-shaped part

Abstract

A cup-shaped part (1) having an inner peripheral uneven surface section (210) has a bottom section (11), a cylinder section (2), and the inner peripheral uneven surface section (210). The inner peripheral uneven surface section (210) has inner peripheral protrusions (211) and inner peripheral recesses (212), the inner peripheral protrusions (211) and the inner peripheral recesses (212) being formed on the inner peripheral surface (21) of the cylinder section (2). Outer peripheral recesses (221) formed by recessing the outer peripheral surface (22) of the cylinder section (2) toward the inside of the cylinder section (2) in the radial direction are formed on the base end (231) side of the outer peripheral surface (22) of the cylinder section (2). A smooth outer peripheral section (224), in which the outer peripheral recesses (221) are not formed, is formed on the opening end (232) side of the outer peripheral surface (22) of the cylinder section (2), the opening end (232) side being the side located opposite to the side on which the bottom (11) of the outer peripheral surface (22) of the cylinder section (2) is provided.

Description

technical field [0001] The present invention relates to a cup-shaped member having an inner peripheral concave-convex portion, a manufacturing method, and a manufacturing apparatus thereof. Background technique [0002] As a clutch drum in an automatic transmission of an automobile or the like, a cup-shaped member is used which has a disc-shaped bottom and a cylindrical portion erected from the outer periphery of the bottom, and has an inner periphery of the cylindrical portion. The inner peripheral concave-convex part formed on the surface. The cup-shaped member having the inner peripheral concavo-convex portion can be manufactured by press processing or flow forming. Compared with stamping, the equipment structure of spinning is complicated, and the amount of waste generated after forming is large, so the cost of equipment and the unit price of parts are easy to increase. In addition, spinning requires a long processing time compared to stamping, so productivity is lower...

AI Technical Summary

Problems solved by technology

[0004] On the other hand, among the conventional press-worked products, there are only processed products in which concave-convex shapes are also provided on the outer peripheral surface in order to ensure the concave-convex shape of the inner peripheral surface.

Images