| 摘要 |
PURPOSE:To provide a method of easily and accurately forming a groove on a sheet-like member comprising a thermoplastic resin. CONSTITUTION:In a method of forming a groove 19a on a sheet-like skin 19 comprising a thermoplastic resin, a pressing member 22a having a shape corresponding to the shape of the groove 19a is pressed against the sheet-like skin 19 by a predetermined force while ultrasonic waves are applied to the pressing member to melt the skin, thus the groove 19a is formed. |
