Effect of injection compression process parameters on residual stress of products based on numerical simulation

Zhu, Jie; Chen, Yanfang; Huang, Wenhan; Zhang, Qiurong; Liao, Xiaoming; Huang, Yizhi; Qiu, Zhiwen

doi:10.1088/1742-6596/1187/3/032031

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…A higher mold temperature reduces the cooling rate of the frozen layer, resulting in more uniform cooling throughout the entire thickness. The effect of mold temperature on residual stress is well supported and has been reported by other researchers [77,92]. Furthermore, the same authors establish in this work, and in a previous work [36], that prediction of residual stress numerical simulation by finite element only works properly from a qualitative point of view, as shown in Fig.…”

Section: Birefringencesupporting

confidence: 90%

Injection molding of high-precision optical lenses: A review

Peixoto

Valentim

Sousa

et al. 2022

Precision Engineering

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Section: Birefringencesupporting

confidence: 90%

Injection molding of high-precision optical lenses: A review

Peixoto

Valentim

Sousa

et al. 2022

Precision Engineering

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“…11 However, other process parameters, for example, the mold temperature, were found to be the most important factor in the reduction of flow-induced stress. 12 The different leading process parameters are not in conflict because the mold, material, and molded part are different and because the objectives for optimization are different. Chen et al extended the method for injection-compression molding (ICM) with Moldex 3D to optimize compression delay time, pressure and cycle times.…”

mentioning

confidence: 99%

Study of overflow effects on flow‐induced stress in injection molding

Lu,

Ma,

et al. 2023

Polymer Engineering & Sci

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Overflow is usually used to keep fluid continuously flowing to avoid the fluid from changing flow direction and subsequently inducing large stresses. To explore the mechanism of flow‐induced stress evolution, a flow model was established in terms of compressible, non‐isothermal, and viscoelastic flow. Based on the Leonov model and the mid‐plane approach, a pseudo‐Poisson type equation for pressure was derived to decouple the interdependence between velocity and pressure. To improve computational efficiency, a numerical approach involving double iterations was proposed to solve the flow problem. Two kinds of mold cavities, with and without overflow, were designed and manufactured. Molding experiments were conducted, and corresponding simulations based on the proposed model and algorithm were performed. The results show that the simulated contours of flow‐induced stress are in good agreement with the photoelastic streaks. The use of overflow can significantly reduce flow‐induced stresses. If the slot thickness is set to a proper value, the flow‐induced stress can be reduced by more than 80%. On the other hand, a slot that is too thick does not have significant reducing effects. Therefore, using overflow to reduce flow‐induced stresses during transparent part production is a promising approach if the material cost is worthy of the quality.Highlights A double iteration method is proposed for viscoelastic flow problem. Overflow can reduce the stress as much as 80% if the dimension is properly set. The simulated stress streaks are in good agreement with photoelasticities.

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Effects of the injection compression process parameters on residual stress of plastic lenses

Chen

Zhang

et al. 2020

Appl. Opt.

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Residual stress affects significantly the quality of plastic lenses. In this paper, the influence of process parameters on the residual stress of injection compression molded plastic lenses was investigated by orthogonal simulation. The results show that the effect of compression delay time on residual stress was the most significant, followed by compression distance and compression speed, which are both related to the compression process. Then, the relationship between the residual stress obtained by simulations and the optical path difference measured by the experiment was compared by single factor experiments of four key injection compression molding process parameters. The change trends were similar, which proves that the numerical simulation has the potential to predict the residual stress of plastic lenses and optimize the process parameters, so as to improve their optical quality.

show abstract

Effect of injection compression process parameters on residual stress of products based on numerical simulation

Cited by 4 publications

References 1 publication

Injection molding of high-precision optical lenses: A review

Injection molding of high-precision optical lenses: A review

Study of overflow effects on flow‐induced stress in injection molding

Effects of the injection compression process parameters on residual stress of plastic lenses

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