| 摘要 |
PROBLEM TO BE SOLVED: To manufacture an inner tube that has uniform inner and outer diameters even though being subjected to heat treatment, and has a reduced deflection.SOLUTION: This inner tube manufacturing apparatus comprises: a support part 11 that supports a tube C made of a metal material; and a press-fitting part 12 which is arranged so as to face the support part 11, presses a spherical body D that has an outer diameter larger than an inner diameter of the tube C and is made of a metal material harder than a material of the tube C, into the tube C, and makes the spherical body D pass through the tube C. |
