| 摘要 |
A system for forging a rack bar from a blank pipe. A blank pipe (1) is held between dies (2 and 3). Stockers (7L and 7R) are arranged on respective sides of the die set. In the stockers (7L and 7R), left-handed shuttles (6L 1 ,6L 2 ,6L 3 ,......6L n and right-handed shuttles (6R 1 ,6R 2 ,6R 3 ,.....6R n ) are stored. First, a left-handed presser rod (5L) inserts the shuttles (6L 1 ) to the blank pipe from the left-handed stocker (7L). Then, a right-handed presser rod (5R) inserts the shuttles (6R 1 )to the blank pipe from the right-handed stocker (7R), causing the shuttles (6L 1 ) to be entrained and returned to the left-handed stocker (7L). Vertical shift movement is alternately executed between the left-handed and right-handed stockers (7L and 7R), so that a shuttle of step-likely increased working height is selected for executing a working process. |
