静压支撑单点渐进成形厚向应变分布研究

尚苗; 李言; 赵兴百; 杨明顺; 陈匡禹

doi:10.13433/j.cnki.1003-8728.20230298

静压支撑单点渐进成形厚向应变分布研究

doi: 10.13433/j.cnki.1003-8728.20230298

西安理工大学机械与精密仪器工程学院，西安　710048

基金项目: 国家自然科学基金项目（52075437）

详细信息

作者简介:
尚苗（1986−），副教授，博士，研究方向为先进制造与现代加工技术，goodseeding@outlook.com

通讯作者:
李言，教授，博士生导师，jyxy-ly@xaut.edu.cn

中图分类号: TG386
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- 文章访问数: 71
- HTML全文浏览量: 32
- PDF下载量: 8
- 被引次数: 0
出版历程
- 收稿日期: 2023-01-06
- 刊出日期: 2023-11-30

Study on Thickness-strain Distribution in Single-point Incremental Forming with Hydrostatic Supporting

School of Mechanical and Precision Instrument Engineering, Xi′an University of Technology, Xi′an 710048, China

摘要

摘要: 采用单点渐进成形技术单道次成形复杂形状的薄壁零件时，厚度分布不均匀及过度减薄易于引起板材的断裂和成形失效。将静压支撑引入单点渐进成形中，形成一种静压支撑单点渐进成形工艺；通过促进材料流动和厚向应变分布来提高板材厚度分布的均匀性。选用初始厚度为1 mm的1060铝板，以静压支撑单点渐进成形的圆锥台件为研究对象，通过数值模拟和实验研究分析了静压参数对厚向应变分布和材料流动规律的影响。结果表明：0 ~ 0.18 MPa的静压支撑有利于过渡变形区Ⅱ的快速成形，有利于主变形区Ⅲ的厚向应变分布；在有利压力范围内，静压压力越大，由Ⅱ区流向Ⅲ区的材料越多，厚向应变分布越均匀，制件成形性能越好。
- 渐进成形 /
- 静压支撑 /
- 厚向应变 /
- 材料流动
Abstract: Uneven thickness distribution and excessive thinning easily lead to sheet fractures and forming failures when forming thin-walled parts with complex shapes in a single pass by using single-point incremental forming process. Hydrostatic supporting was introduced into the single-point incremental forming, and a single-point incremental forming process with hydrostatic supporting was formed; the uniformity of the sheet thickness distribution was improved by promoting material flow and thickness strain distribution. The 1060 aluminum sheets with an initial thickness of 1mm were selected, and the hydrostatically supported single-point incremental forming conical parts were taken as the research objects, and the influence of the hydrostatic parameters on the thickness strain distribution and material flow laws were analyzed by using numerical simulation and experiments. The results show that hydrostatic supports of 0-0.18 MPa are favorable to the rapid forming in the transition deformation zone II and the thickness strain distribution in the main deformation zone III; within the favorable pressure range, the higher the hydrostatic pressure, the more material flows from zone II to zone III, the more uniform the thickness strain distribution and the better the forming performance of the parts.
- incremental forming /
- hydrostatic support /
- thickness strain /
- material flow

HTML全文

图 1 HS-SPIF原理

Figure 1. HS-SPIF principles

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图 2 三角单元剪切模型

Figure 2. Triangular unit shear model

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图 3 HS-SPIF的有限元模型

Figure 3. Finite element model of HS-SPIF

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图 4 模拟的最终形状

Figure 4. Simulated final shape

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图 5 刀具运动轨迹

Figure 5. Tool trajectory

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图 6 厚向应变分布云图

Figure 6. Thickness-strain distribution cloud

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图 7 静压支撑对不同区域厚向应变的影响

Figure 7. Effect of hydrostatic support on thickness strain indifferent regions

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图 8 HS-SPIF 实验装置

Figure 8. HS-SPIF Experimental Device

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图 9 0.19 MPa的成形制件

Figure 9. Formed parts of 0.19 MPa

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图 10 切割试件半剖图

Figure 10. Cutting specimen half-section diagram

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图 11 SPIF厚向应变分布（0 MPa）

Figure 11. Thickness-strain distribution of SPIF （0 MPa）

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图 12 HS-SPIF厚向应变分布（0.16 MPa）

Figure 12. Thickness strain distribution of HS-SPIF （0.16 MPa）

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图 13 各压力下的实验厚向应变分布

Figure 13. Experimental thickness strain distribution ofdifferent pressures

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表 1 HS-SPIF有限元模型各参数

Table 1. Parameters of HS-SPIF finite element model

类别	板材	工具头	夹具
网格划分	网格类型：S4R单元单元尺寸：1 mm × 1 mm 单元数量：7 606 节点个数：17 821	解析性刚体	解析性钢体
模型	壳体金属塑性	解析性钢体	解析性钢体
材料	1060铝板（密度2.71 g/mm³，弹性模量68 GPa，泊松比0.33，屈服强度138 MPa，抗拉强度145 MPa）	淬火高速钢	合金钢
接触条件	板材与工具头接触类型：面-面接触；板材与夹具接触类型：面-面接触
边界条件	X、Y、Z方向的转动被约束板材边缘表面的6个自由度被约束	X和Y方向的转动被约束转速700 r/min	6个自由度被约束

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