| 摘要 |
<p>An automatically controlled cutting machine, and related method, for cutting sheet material S employs a cutting tool 11 and a hard, smooth and continuous surface 14 on which the sheet material is spread for cutting. The cutting tool 11 has a cutting surface facing the support surface and is moved by a numerically controlled mechanism 26,30,32,38 relative to the support surface to move the cutting surface along the desired line of cut, and during this movement the tool is ultrasonically vibrated along an axis generally perpendicular to the support surface to cause the cutting surface to sever the sheet material with a crushing action. The tool may be force biased toward the support surface, either with open loop or closed loop control of the tool force, or may be maintained at a given fundamental elevation relative to the support surface as by means of an associated displacement sensing and controlling system. <IMAGE></p> |
