| 摘要 |
<p>The metal structure is formed from a sheet without cutting, stretching, crimping or ripping. Folding is started along selected fold lines, and the metal is simultaneously folded along the lines which are straight fold lines in the formed structure. The structure has a number of surface sections each of which can be expanded or developed and which together form a complex surface. The groups of straight bending lines, in adjacent segments or sections, so meet each other within the surface of the structure, that a straight line which extends from free edge to free edge of the structure is not defined. The projections of the bending lines so meet each other within the projected matrix that the definition of a straight line, extending from free edge to free edge, is eliminated.</p> |
