压合衬套二次冷挤压强化数值仿真与实验研究

刘儒军; 黄翔; 黄海鸿; 陶梅生; 殷超超; 班许可岭

doi:10.13433/j.cnki.1003-8728.20240071

压合衬套二次冷挤压强化数值仿真与实验研究

doi: 10.13433/j.cnki.1003-8728.20240071

刘儒军^{1, 2,},
黄翔^1, ,,
黄海鸿³,
陶梅生³,
殷超超³,
班许可岭²

1.
南京航空航天大学机电学院, 南京 210016
2.
国营芜湖机械厂, 安徽芜湖 241007
3.
合肥工业大学机械工程学院, 合肥 230009

基金项目:

国家自然科学基金项目 51975280

详细信息

作者简介:
刘儒军, 博士研究生, lrjdeyou@163.com

通讯作者:
黄翔, 教授, 博士生导师, xhuang@nuaa.edu.cn

中图分类号: TG376.3
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- 文章访问数: 771
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- 被引次数: 0
出版历程
- 收稿日期: 2023-11-14
- 刊出日期: 2024-07-25

Numerical Simulation and Experimental Study on Secondary Cold Extrusion Strengthening of Pressed Bush

1.
School of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2.
State-owned Wuhu Machinery Factory, Wuhu 241007, Anhui, China
3.
School of Mechanical Engineering, Hefei University of Technology, Hefei 230009, China

摘要

摘要: 采用压合衬套二次冷挤压工艺对7050铝合金耳片孔进行挤压强化; 通过X射线衍射仪、三坐标测量机和粗糙度仪, 研究二次冷挤压对耳片孔内表面的残余应力、塑性变形以及粗糙度的影响, 并通过有限元仿真进行验证。实验结果表明: 相较于一次冷挤压, 压合衬套二次冷挤压可有效改善试样两端残余应力的不均匀性。随着二次冷挤压相对挤压量增大, 残余压应力峰值和应力层深度都进一步增大, 塑性变形程度也更大, 同时降低了孔壁表面粗糙度。在相对挤压量为2.5%时, 最大残余压应力可达-400.3 MPa, 并形成了约14 mm的残余压应力层; 试样端面A与端面B内径分别增大了0.56 mm和0.54 mm; 孔壁表面粗糙度降低幅度达到71.0%。相较于一次冷挤压, 二次冷挤压强化后孔壁沿径向形成了更深的残余压应力层和塑性变形层, 显著提高了耳片孔的整体服役性能。
- 二次冷挤压 /
- 压合衬套 /
- 相对挤压量 /
- 残余应力 /
- 塑性变形
Abstract: The ear hole of 7050 aluminum alloy was strengthened by using the second cold extrusion of pressed bush; The effects of the second cold extrusion on the residual stress, plastic deformation, and roughness of the inner surface of the ear hole were studied via X-ray diffractometer, coordinate measuring machine, and roughness meter, and which were verified through finite element simulation. The experimental results show that comparing with that in first cold extrusion, the second cold extrusion of the pressed sleeve can effectively improve the non-uniformity of residual stress at both ends of the sample. As the relative extrusion amount of the second cold extrusion increases, the peak residual compressive stress and the depth of the stress layer increase, and the degree of the plastic deformation increases too, meanwhile the surface roughness of the hole wall decreases. When the relative extrusion amount is 2.5%, the maximum residual compressive stress can reach -400.3 MPa, and there is a residual compressive stress layer of about 14 mm. The inner diameters of the sample end face A and end face B increased by 0.56 mm and 0.54 mm, respectively; the surface roughness of the hole wall decreased by 71.0%. Comparing with the first cold extrusion, the second cold extrusion strengthening forms a deeper residual compressive stress layer and plastic deformation layer along the radial direction of the hole wall, significantly improving the overall service performance of the ear hole.
- second cold extrusion /
- pressed bush /
- relative extrusion amount /
- residual stress /
- plastic deformation

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图 1 耳片孔试样形状与尺寸(单位: mm)

Figure 1. Shape and size of ear hole sample (Unit: mm)

下载: 全尺寸图片幻灯片

图 2 压合衬套二次冷挤压强化工艺示意图

Figure 2. Schematic diagram of secondary cold extrusion strengthening process for compression bushing

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图 3 残余应力指标提取位置(单位/mm)

Figure 3. Residual stress index extraction location (unit: mm)

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图 4 二次冷挤压后孔壁沿径向残余应力分布

Figure 4. Distribution of radial residual stress on the hole wall after secondary cold extrusion

下载: 全尺寸图片幻灯片

图 5 一次与二次冷挤压后耳片孔残余应力对比

Figure 5. Comparison of residual stresses in the ear hole after primary and secondary cold extrusion

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图 6 压合衬套冷挤压强化有限元模型

Figure 6. Finite element model for cold extrusion strengthening of compression bushing

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图 7 耳片孔与衬套应变-应力曲线

Figure 7. Strain stress curve of ear hole and bushing

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图 8 二次冷挤压后耳片孔残余应力分布云图

Figure 8. Cloud map of residual stress distribution in the ear hole after secondary cold extrusion

下载: 全尺寸图片幻灯片

图 9 二次冷挤压后衬套内径变化

Figure 9. Changes in inner diameter of bushing after secondary cold extrusion

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图 10 二次冷挤压后耳片孔内径变化

Figure 10. Changes in inner diameter of ear hole after secondary cold extrusion

下载: 全尺寸图片幻灯片

图 11 耳片孔结点选取位置

Figure 11. Ear hole node selection location

下载: 全尺寸图片幻灯片

图 12 耳片孔内径仿真数据与实验数据对比

Figure 12. Comparison between simulation data and experimental data on the inner diameter of the ear hole

下载: 全尺寸图片幻灯片

图 13 一次与二次冷挤压后粗糙度R_a对比

Figure 13. Comparison of roughness R_a after primary and secondary cold extrusion

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表 1 7050铝合金材料各元素的质量分数

Table 1. Chemical composition of 7050 aluminum alloy material %

Zn	Mg	Cu	Zr	Si	Fe	Mn	Cr	Al
6.02	2.31	2.04	0.10	0.03	0.11	0.003	0.009	剩余

下载: 导出CSV

表 2 7050铝合金及压合衬套基本力学性能

Table 2. Basic mechanical properties of 7050 aluminum alloy and compression bushing

试样	材料	抗拉强度σ_b/MPa	屈服强度σ_s/MPa	弹性模量E/GPa	泊松比λ
耳片	7050铝合金	510	441	70	0.32
压合衬套	0Cr13Ni8Mo2A1	1 515	1 415	210	0.30

下载: 导出CSV

表 3 二次冷挤压后孔壁表面粗糙度测量结果

Table 3. Measurement results of surface roughness of hole wall after secondary cold extrusion

相对挤压量	R_a/μm
相对挤压量	挤压前	端面A	端面B
1.7%	0.974 5	0.376 4	0.380 2
2.0%	0.973 2	0.352 4	0.347 2
2.3%	0.977 3	0.310 9	0.319 6
2.5%	0.974 9	0.282 3	0.287 8

下载: 导出CSV

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