锻压技术

小直径开缝衬套冷挤压强化性能

英文标题：Cold extrusion strengthening performance for small-diameter split sleeve

作者：吴小红孙朝

分类号：TG376.3

出版年,卷(期):页码：2025,50(7):106-111

摘要：

采用自主设计定制的专用卷圆成形设备了成功制备小直径（Ф3.0~Ф10.5 mm）开缝衬套，并能够满足冷挤压强化要求。研究了12Cr17Ni7不锈钢原材料硬度和润滑对开缝衬套冷挤压拉力的影响，以及7050-T7451铝合金冷挤压强化孔的疲劳性能。结果表明，12Cr17Ni7不锈钢原材料的硬度为465 HV时，对其表面采用二硫化钼+15%十六醇进行润滑可以降低成形拉力，防止衬套翻边处开裂，保证冷挤压孔质量。采用开缝衬套冷挤压强化技术对7050-T7451铝合金结构孔进行强化，能够提高其结构件的疲劳寿命。当结构件承受的最大载荷为破坏载荷的35%时，平均疲劳寿命提高5.5倍；当结构件承受的最大载荷为破坏载荷的50%时，平均疲劳寿命提高2.3倍。

The small-diameter(Ф3.0-Ф10.5 mm) split sleeve was fabricated successfully by an self-designed and customized special roll forming equipment which could meet the requirements of cold extrusion strengthening. Then, the influences of raw material hardness for 12Cr17Ni7 stainless steel and lubrication on the cold extrusion tensile force of split sleeve were studied, and the fatigue performance of cold extrusion strengthening holes for 7050-T7451 aluminum alloy was also investigated. The results show that when the raw material hardness of 12Cr17Ni stainless steel is 465 HV,lubricating its surface with molybdenum disulfide +15% cetyl alcohol can reduce the forming tensile force, prevent cracking at the flange of the bushing, and ensure the quality of cold-extruded holes.Strengthening the structure holes of 7050-T7451 aluminum alloy by cold extrusion strengthening technology of split sleeve can improve the fatigue life of their structural components. When the maximum load of structural components is 35% of the failure load, the average fatigue life is increased by 5.5 times. When the maximum load of structural components is 50% of the failure load, the average fatigue life is increased by 2.3 times.

基金项目：

航空连接技术创新科研项目（APA 2019-15）

作者简介：吴小红（1990-），男，硕士，工程师 E-mail：1736377828@qq.com

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