| 摘要 |
PURPOSE:To form the flowing material into a continuous shape, to shorten the forming time, and to improve the producibility, by thread rolling the laminated gear blank which is passed while its outer circumference is being thrusted against the innermost part of the outer circumference of the thread rolling roll. CONSTITUTION:When the work W is moved down a stroke l by the plunger 13, the outer circumference of the work W makes the rolling contact with the innermost part of the rolling rolls 10a-10a ... 10e-10e. After the downward movement of the plunger 13 comes to the end point, the plunger 13 is moved so far as l upward, and the ram 4 is moved so far as l/2. That is, the work W moves so far as l/2 downward for every one reciprocation of the plunger 13 and the ram 4. The innermost parts of each couple of rolling rolls 10a-10a ... 10e-10e are located so as to be narrower than the upper stage; hereby, the work W gradually receives the thread rolling work; and after the finish forming by the ring wall 8e at the lowest stage, the work W passes through the hole of the backup ram 4, falls down from the stationary table 1, and is collected. |
