| 摘要 |
PURPOSE:To manufacture inexpensively a knuckle for front wheels of automobiles through simple works which hardly produce burrs, by adopting a forge working process, molding process using metallic dies, etc. CONSTITUTION:A knuckle arm section 3 and head section 2 are formed by elongating a steel bar which is the blank material of a knuckle in the longitudinal direction by rolling by means of the reciprocating movement of a roller 4, etc. Then a tir rod arm 5 is formed from the head section 2 by pushing an upper die 7 downward in the direction shown by the arrow F by using the upper die 7 and a lower die 6. In this case, the thickness of the head section 2 at the central part is reduced by means of a projected section 15 provided on the inner side face of the lower die 6. Thereafter, a center boss 16, central depression 17, caliber bracket 18, and king pin boss 19 are formed by pressing the head section 2 with the upper and lower dies 6 and 7. Successively, the arm end bods 20 at the front of end of the knuckle arm 3, etc., are formed and, after removing a small quantity of produced burrs, a knuckle is finished. |
