基于有限元仿真的聚酰亚胺切削参数优化

张航; 雷学林; 何云; 李子璇

doi:10.14135/j.cnki.1006-3080.20210210001

基于有限元仿真的聚酰亚胺切削参数优化

doi: 10.14135/j.cnki.1006-3080.20210210001

华东理工大学机械与动力工程学院上海 200237

基金项目: 上海航天科技创新基金（SAST2019-089）

详细信息

作者简介:
张航：张　航（1995-），男，陕西西安人，硕士生，主要从事切削理论与刀具的研究，E-mail：hang0228@outlook.com

通讯作者:
雷学林，E-mail：xuelinlei@ecust.edu.cn

中图分类号: TH133.3
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- 文章访问数: 216
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- 被引次数: 0
出版历程
- 收稿日期: 2021-02-10
- 网络出版日期: 2021-06-24
- 刊出日期: 2022-04-22

Optimization of Polyimide Cutting Parameters Based on Finite Element Simulation

School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China

摘要

摘要: 采用VUMAT子程序嵌入法，考察了聚酰亚胺高分子材料弹性变形阶段的应力-应变关系，并通过三维热-力耦合有限元模型分析了切削工艺参数对聚酰亚胺铣削过程中切削力、切削温度和切屑形态的影响规律。结果发现：随着进给量的增大，仿真的切削力、切削温度增加或升高，切屑的带状化程度变得严重。随后利用切削实验，验证了仿真模型的有效性与准确性，并获得了聚酰亚胺的最优切削工艺参数：进给量为0.20~0.30 mm/r。
- 聚酰亚胺 /
- 有限元 /
- 本构模型 /
- 铣削
Abstract: Using the VUMAT subroutine embedding method, the stress-strain relationship in the elastic deformation stage of the polyimide polymer material is described, and the effects of the cutting process parameters on the cutting force of the polyimide milling process are analyzed through the three-dimensional thermal-mechanical coupling finite element model. The influence law on cutting force, temperature and chip morphology of the polyimide milling process is analyzed through the three-dimensional thermal-mechanical coupling finite element model. The result is that as the feed rate increases, the simulated cutting force and cutting temperature increase as well, and the degree of banding of chips will become serious. Subsequently, the cutting experiment was used, and the cutting force difference between the simulation and experiment was up to 18%, and the cutting temperature difference was up to 23%. When the feed rate increases, the degree of chip curling increases and the surface texture becomes deeper. When the feed rate is 0.15 mm/r and 0.45 mm/r, the chip edge tears. Defects such as adhesion, drawing, and layup of tiny chips on the machined surface of the workpiece cause the material microporous flow channel to be blocked. This constitutive model has certain universality to polymer materials. The validity and accuracy of the simulation model have been verified, and the optimal milling process parameters for polyimide have been obtained: milling depth (a_p) is 1 mm, milling speed (v) is 75 m/min, and feed amount f = 0.20~0.30 mm/r.
- polyimide /
- finite element analysis /
- constitutive model /
- milling

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图 1 铣削聚酰亚胺的有限元模型

Figure 1. Finite element model for milling polyimide

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图 2 高分子材料应力-应变的曲线与仿真曲线比较

Figure 2. Comparison of real stress-strain curve and simulation curve of polymer materials

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图 3 程序整体流程

Figure 3. Overall process of the program

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图 4 铣削实验设置

Figure 4. Milling experimental device

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图 5 进给量对铣削力的影响

Figure 5. Effect of feed rate on milling forces

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图 6 刀具参考点及对应温度

Figure 6. Tool reference point and corresponding temperature

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图 7 不同进给量条件下的切屑形态

Figure 7. Chips under different feed rate

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图 8 仿真与实验的切削力对比

Figure 8. Comparison of cutting force between simulation and experiment

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图 9 仿真与实验的切削温度对比

Figure 9. Comparison of cutting temperature between simulation and experiment

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图 10 实验切屑形貌(a)及SEM图(b~e)

Figure 10. Chip morphology and SEM by experiment

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表 1 刀具和工件的物理参数

Table 1. Physical parameters of tool and workpiece

Material	ρ/(kg·m⁻³)	E /10⁻⁹Pa			ν	k/(W·m⁻¹·K⁻¹)	α/10⁻⁵ K⁻¹		c/(J·kg⁻¹·K⁻¹)	T_m/K
Material	ρ/(kg·m⁻³)	303 K	333 K	363 K	ν	k/(W·m⁻¹·K⁻¹)	323 K	373 K	c/(J·kg⁻¹·K⁻¹)	T_m/K
Polyimide	1110	4	3.61	3.12	0.34	0.85(373 K)	5.8	5.7	1250	600
YG8	14500	640	640	640	0.22	75.4	0.45	0.45	220	1 923

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表 2 铣刀尺寸参考值

Table 2. Reference value of milling inserts

Material	Species	Coating	D/mm	d/mm	l/mm	L/mm	θ/(°)
Carbide	Flat-end	AlTiN	5	6	13	50	45

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表 3 铣削仿真参数

Table 3. Milling simulation parameter

Group	a_p/mm	v_c/(m·min⁻¹)	f/(mm·r⁻¹)
1	1	75	0.10
2	1	75	0.15
3	1	75	0.20
4	1	75	0.25
5	1	75	0.30
6	1	75	0.35
7	1	75	0.40
8	1	75	0.45

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参考文献(14)

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