| 摘要 |
<p>Disclosed is a method of manufacturing a half-nut made of a steel plate in which a female screw is formed at an inner surface of a U-shaped steel plate member. In the method, if the steep plate having a predetermined size is prepared, the steel plate is cut to form a flat first preform including a first member perform. The first member preform of the flat first perform is subjected by primarily bending, to form a second preform including a second member perform. The second member preform includes a semicircular curved portion and a pair of inclined plane portions extending obliquely from distal ends of the semicircular curved portion. Simultaneous with the primary bending, an inner surface of the semicircular curved portion is subjected to coining, to form a female screw at the inner surface of the semicircular curved portion. The female screw includes a plurality of screw threads and screw valleys arranged alternately with each other. Then, the inclined plane portions of the second perform is subjected to secondary bending, to form a half-nut including a pair of flat plane portions extending parallel to each other from the distal ends of the semicircular curved portion. With the press forming such as bending and coining, etc., the female screw can be simply and precisely formed at the inner surface of the U- shaped steel plate member, resulting in an improved productivity and reduced manufacturing costs.</p> |
