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cdsl-cad/backend/agent/skills/cdsl-author-guidance/op-bend.md
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`bend_add` 以中面折线链定义等厚钣金折弯:正的 `thickness_mm`、`width_mm` 和至少一翼的 `chain`;非末翼必须给 `bend_angle_deg`(内角,0 < angle < 180,90 为直角折弯),可选 `inner_radius_mm`(>= 0,外半径恒为内半径加板厚)与 `side`(+1 / -1,折弯方向)。`frame` 可选,缺省为世界 XY 平面(首翼沿 +X,厚度沿法向)。相邻折弯圆角会消耗直段长度(约 `inner_radius + thickness/2` 的切线距离),每翼剩余直段必须为正,否则规格非法。仅用于意图明确的钣金折弯;单翼链退化为平板,普通平板轮廓应保留草图历史表达而非用 bend_add 替代。