| 摘要 |
The present invention relates to a screw used for connecting a hard disk drive cover to a steel plate and a method for manufacturing the same. In conventional joints, the tightening force gets weaker when the threaded portion is shorter then the length of the screw because there is an un-threaded portion below the full length of the screw. To solve such problems, a screw is provided which has a head formed on one end and a threaded portion formed on the outer circumferential surface of the other side, wherein the threaded portion has a uniform outer diameter, and an edge intersecting the axial direction is formed on the front end of the threaded portion. The manufacturing method comprises: forming a head by forging and cutting a wire-shape material; roll forming a threaded portion with stationary and movable dies on the outer circumferential surface of a body with the head formed thereon; and cutting the threaded portion to a predetermined length with a cutting edge formed on the roll formed, stationary and movable dies. Accordingly, when the screw is fastened to a low-height female threaded portion of a target object, the fastening action is facilitated and the defect rate is reduced to a minimum, and this provides improved productivity, lower costs and increased joint force. |
