| 摘要 |
In the invention, an oscillating horn (4C) of an ultrasonic processing apparatus (4) is moved along a planned process line and along the side of a rear face (3b) of a resin skin (3) which is fixedly held so that the front face is closely in contact with a flat face (la) of a surface table (1), whereby a resin for the skin is sequentially fused by ultrasonic vibration, and a fused resin (3d) is removed to sides to process a linear groove (6). Therefore, the linear groove (6) having a reproducible constant breakage resistance can be efficiently processed on the side of the rear face (3b) of the skin (3), without applying any damage to a design face, and with reduced power consumption and simple control. <IMAGE> |
