Research on Optimization of Polyimide Cutting Parameters Based on Finite Element Simulation
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摘要: 采用VUMAT子程序嵌入法，描述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、切削温度会升高，切屑的带状化程度会变得严重。随后采用切削实验，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为：铣削深度ap=1 mm，铣削速度v＝75 m/min，进给量f=0.2~0.3 mm/r。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 effect of the cutting process parameters on the cutting force and cutting force of the polyimide milling process is analyzed through the three-dimensional thermal-mechanical coupling finite element model. The influence law of temperature and chip morphology, the result is that as the feed rate increases, the simulated cutting force and cutting temperature will increase, and the degree of banding of chips will become serious. Subsequently, the cutting experiment was used, and the difference between the simulation and the experiment cutting force was up to 18%, and the difference in cutting temperature was up to 23%. When the feed rate increases, the degree of chip curling increases and the surface texture becomes deeper, and 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 ap = 1 mm, milling speed v = 75 (m/min), and feed amount f = 0.2 ~0.3 (mm/r).
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Key words:
- polyimide /
- finite element analysis /
- constitutive model /
- milling
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图 2 高分子材料真实测试曲线与仿真曲线比较
Figure 2. Comparison of real stress-strain curve and simulation curve of polymer materials
图 8 仿真与实验的切削力对比
Figure 8. Comparison of cutting force between simulation and experiment
图 9 仿真与实验的切削温度对比
Figure 9. Comparison of cutting temperature between simulation and experiment
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·K)−1)) α/10−5 K−1 c/(J((kg·K)−1)) Tm/K Polyimide 1110 4(303K)
3.61(333K)
3.12(363K)0.34 0.85(373K) 5.8(323K)
5.7(373K)1250 600 YG8 14500 640 0.22 75.4 0.45 220 1923 
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表 2 铣刀尺寸参考值
Table 2. Reference value of the 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 table
ap/(mm) v/(m·min−1) f/(mm·r−1) ap/(mm) v/(m·min−1) f/(mm·r−1) 1 75 0.1 1 75 0.3 0.15 0.35 0.2 0.4 0.25 0.45
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