Blank Diameter Calculation
圆坯落料尺寸计算
标签：坯料直径, 面积守恒, 修边余量, 展开计算
按"面积守恒"展开：先按成品中性层求得表面积，反推圆坯直径 D₀=√(4A/π)，并预留 3–5 mm 修边余量。对带凸缘件，应将凸缘面积一并计入。铜软而延展，计算值可直接用；若多次拉深，每道按中间半成品面积递推，避免累积误差。
Use the area-conservation method: compute the finished neutral-layer surface area A, then back-calculate blank diameter D₀=√(4A/π) and add a 3–5 mm trim allowance. For flanged parts include the flange area. Copper is soft and ductile, so the calculated value is directly usable; for multi-pass draws recurse from each intermediate blank to avoid accumulated error. ---