Curved Folds over Dapping Forms
曲面折叠：配合窝砧的立体折
标签：曲面折叠, 窝砧, 立体折, 器皿
在半球窝砧上做弧线折叠可生成壳状立体形态（碗沿、叶状器皿）：板料覆在窝模上压出预弯，沿弧线折起 30–60°，展开后自然形成空间曲面。折叠线间距 15–25 mm 时曲面过渡最顺；折起顺序由中心向外防止边缘起皱。与平面折叠不同，弧折后展开率仅 40–60%（平面折可达 80%），下料需相应放大。
Folding along curved lines over a dapping form creates shell-like volumes (bowls, leaf vessels): pre-curve the sheet over the form, fold up 30–60° along the arc, and the sheet springs into a 3D curve on opening. Line spacing of 15–25 mm gives the smoothest transitions; fold from center outward to prevent edge wrinkling. Unlike flat folds, curved folds open only 40–60% (flat up to 80%)—size blanks accordingly. ---