Definition and Principle of Fold Forming
折叠成型的定义与原理
标签：折叠成型, 折轴记忆, 冷作成型, 无模成型, 塑性变形
折叠成型是一种"折叠—锤压—展开"的冷作成形法。其核心原理是：金属在折痕轴处受折叠约束，锤压时只能朝有限方向塑性流动，展开后这种受限变形被"锁定"成凸凹起伏的立体形态。它几乎只用锤、砧和台钳，是金工中最省模具的造型手段之一。
Fold forming is a "fold–hammer–open" cold-shaping method. Its core principle: constrained at the fold axis, metal under hammering can only flow in limited directions; once opened, that constrained deformation is locked into a raised relief. It needs little more than hammer, stake and vise, making it one of the least tool-dependent forming methods in metalwork. ---