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一种内外径椭圆的环件单侧径向受限校形方法

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9Claims · 1 independent
§ Ⅰ

Dossier Overview

Inventor

冉兴; 王龙祥; 冀胜利; 朱明渝; 邹伟; 曹俊生; 任永海

IPC Classification

B21D 1/08 (2006.01)B21D 41/04 (2006.01)B21D 41/02 (2006.01)

本发明涉及金属环件塑性成形技术领域,公开了一种内外径椭圆的环件单侧径向受限校形方法。针对现有胀形/缩径工艺因单侧自由状态导致尺寸失控的问题,本方法采用交替约束策略:根据内外径椭圆度差异,先通过缩径锁定外径或胀形锁定内径;具体包括:将环件置于胀缩模具间,分次执行缩径和胀形工序,每次变形后保持一侧模具加载以约束自由侧变形;其中缩径位移量δ为环件外径0.05%~0.5%,旋转角度α为10°~60°。通过离散扇形模具与动态约束机制,解决了传统工艺中椭圆度加剧、贴模失效及应力集中问题,使环件圆度满足要求,大幅提高大型薄壁环件成品率。

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