| 摘要 |
<p>Rather than dozens of kinds of flat plate-like lower molds of different sizes and shapes, a pair or small set of bar-like lower molds having push springs or the like serving as a rotation inhibiting function are used, a metal sheet surface is concomitantly closely contacted with the metal contact surfaces of the bar-like lower molds while inhibiting rotation of the bar-like lower molds, and the pressing force from the upper molds is properly transmitted to the metal sheet, neatly bending the metal sheet to provide a sharp bend depending on the purpose of use, without damage, thus improving the bending accuracy and quality of the metal sheet.</p> |
