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折弯 · 回弹 · 模具 · 工艺

不锈钢折弯回弹:为什么角度总差一点,怎么补偿

回弹来自弹性恢复,与牌号、硬度、R 角与 V 槽宽度有关。可通过过弯补偿、模具与工艺调整解决,不能只靠加大压力。
不锈钢折弯后角度回弹是常见问题,原因与对策:
1) 原因:材料的弹性恢复;奥氏体钢(304)加工硬化明显,回弹大于低碳钢;R 角越大、V 槽越宽、板越厚,回弹越明显。 2) 补偿方法: • 过弯(overbend):按经验多折 1°–3°,再回弹到目标角; • 模具补偿:调整下模 V 槽宽度与上模 R 角; • 工艺:分次折弯、控制折弯速度与保压时间; • 材料:硬态料回弹更大,必要时选软态或调整设计。 3) 测量:用角度尺/样板检查首件,批量抽检;不同批次材料回弹可能不同,换批要重新试折。
注意:不锈钢折弯开裂常与 R 角过小、毛刺方向、材料硬态有关;R 角应大于板厚的合理倍数(按材料与状态),必要时做弯曲试验验证。
折弯工艺参数建议写入作业指导书,首件确认后再批量生产。
Compiled by SteelWe editors and industry experts. For industry exchange only; not trading or investment advice. Cite the source when quoting.
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