| 摘要 |
PURPOSE:To manufacture a lengthy tube with an extra fine inner diameter industrially advantageously. CONSTITUTION:A tube material layer is formed on a metal wire having the breaking elongation of at least 20%, then the metal wire is drawn to manufacture an extra fine inner diameter tube. The drawing workability of the metal line from the tube material is improved, and by this method, the lengthy tube with an extra fine inner diameter can easily be manufactured and machined. |
