| 摘要 |
<p>The present invention is directed at an improved thread rolling die (90), comprising the parallel longitudinal top and bottom edges (102, 104), flat tapered die ends (112, 114), and a vertical face (118) that is used in producing the thread. Formed on the face is a series of parallel ridges (120) which include a plurality of flanks (127, 128) positioned at a pre-determined angle. The ridges are complementary to the thread to be produced and are at an acute angle relative to the top and bottom edges (102, 104). The ridges are congfigured for producing a thread helix when a blank is rolled between a set of dies. The thread roll dies have have flat narrow surfaces (162) at an angle of less than 60 degrees from the vertical face of the die, rather than being perpendicular to the longitudinal axes of the ridges. The top edge of the die leading to the ends of the vertical face of the die and leading away from the top surface of the die at a 60 degree angle. The ends (162) of the die are positioned approximately 30 degrees from the perpendicular position to create smoother threads.</p> |
