| 摘要 |
PROBLEM TO BE SOLVED: To improve a method for manufacturing rotational symmetrical parts from a tube for a simple and low cost one as much as possible. SOLUTION: The manufacturing steps and method are comprised of use of a tube whose wall thickness is equivalent to the minimum wall thickness of finished parts, partial heating on at least one portion of the tube, tube upsetting in the axial direction in the heated portion of the tube, and forging in the radial direction in the heated portion of the tube. |
