| 摘要 |
PURPOSE:To obtain a very small, very thin nozzle or pipe by using a mandrel of wire rod and maintaining rigidity of the pipe by stopping drawing before arriving at the finish size and then making ironing. CONSTITUTION:An end of a mandrel 7 made of a wire rod is held by a mandrel chuck 6 and a pipe 5 fitted to the other end is held by a collet chuck 4. The pipe 5 is rotated and rollers 8 are pressed as the first process and brought into close contact with the mandrel 7 by drawing. In the first process, working is stopped leaving a part C which is larger than the finish size of the product. At the second process, the part l3 is ironed and finished to required thickness T. The part D is left unworked to prevent failure of worked part E. |
