Simulation and Analysis of Kinematic Pair Interfacial Damage Deformation from In⁃mold Micro Assembly Molding Process

doi:10.19491/j.issn.1001-9278.2021.06.010

Abstract

Abstract:

The micro assembly interfacial damage deformation is one of the main bottleneck issues in the industrial application of advanced in?mold micro assembly technology. Aiming at this issue， the simulation technology of interfacial damage deformation was established for in?mold micro assembly molding. The results indicated that two types of interfacial damage deformation of depression collapse and viscous drag flying edge were easily induced near the surface of the leading edge for upstream micro assembly Interface. The interfacial damage deformation exhibited a parabola evolution law with the injection speed of the secondary molding process， which decreased at first and then tended to increase. This was positively correlated with the depression collapse driven pressure of thermal fluid solid coupling， the depression collapse?driven normal stress of viscoelastic support and the flying edge driven shear stress of viscous drag. However， it was negatively correlated with the evolution region thickness of continuous phase transition. The reduction of the thermal fluid solid coupling impact load and the thickness of continuous phase transformation evolution region is beneficial to the depression of the kinematic pair interfacial damage deformation.

Key words: polymer, micro mechanical system, in mold micro assembly molding, damage deformation, simulation

CLC Number:

TQ320

ZHOU Guofa, ZHANG Xinyu, FU Binyi. Simulation and Analysis of Kinematic Pair Interfacial Damage Deformation from In⁃mold Micro Assembly Molding Process[J]. China Plastics, 2021, 35(6): 60-67.

Figures/Tables 17

Fig.1. In?mold micro assembly molding process

Fig.2. Experimental results of interfacial damage deformation

Fig.3. Solid and finite element model

材料	η/Pa·s	λ/s	ξ	β	η_r
PS	2267	0.1	1.87	0.22	0.067

Tab.1. PTT model parameter of PS

Fig.4. Stress?strain?temperature relation of ship PMMA

Fig.5. Cloud chart of damage deformation in matching interface

Fig.6. Damage deformationes vs injection flow

Fig.7. Cloud chart of thermal?fluid?solid coupling temperature field

Fig.8. Cloud chart of temperature field in middle cross section of micro shaft

Fig.9. Coupling temperature profile along line 1

Fig.10. Injection flow vs the highest coupling temperature

Fig.11. Thickness of transformation zone vs injection flow

Fig.12. Collapse driving pressure along line 1 vs coordinate y

Fig.13. Normal stress τ11 along line 1 vs coordinate y

Fig.14. Normal stress τ11 along line 1 vs coordinate y

Fig.15. Shear stress τ13 along line 1 vs coordinate y

Fig.16. Comparative analysis of interface damage deformation and strain under thermal mechanical loading

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