Simulation and experiment research on the proportional pressure control of water-assisted injection molding

Zhou, Hua; Chen, Yinglong; Zhang, Zengmeng; Yang, Huayong

doi:10.3901/cjme.2012.03.430

Cited by 9 publications

(6 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6,7 Water is easy to be recycled, making WAIM more economical and environmentally friendly, and the more efficient cooling effect of water contributes to a shorter molding cycle time, further reducing production costs. [8][9][10] In view of the unique advantages of WAIM, a considerable amount of research on WAIM has been carried out. Most research has mainly focused on the effect of processing parameters, the structures of water injection pins, as well as the water channel design on the water penetration behavior.…”

Section: Introductionmentioning

confidence: 99%

“…Most research has mainly focused on the effect of processing parameters, the structures of water injection pins, as well as the water channel design on the water penetration behavior. [1][2][3]6,9,10 However, research on the fiber orientation in overflow water-assisted injection molding (OWAIM) parts is limited. Although previous studies 1,[11][12][13] have revealed the difference of fiber orientation distribution across the part thickness between the short-shot water-assisted injection molding (SSWAIM) and CIM, the origin of fiber orientation development during water penetration is still unclear.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Formationmechanism of high‐pressure water penetration induced fiber orientation in overflow water‐assisted injection molded short glass fiber‐reinforced polypropylene

Zhang

Liu

Jiang

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

Recently, there has been growing interest in water‐assisted injection molding (WAIM) not only for its advantages over gas‐assisted molding (GAIM) and conventional injection molding (CIM), but also for its great potential advantages in industrial applications. To understand the formation mechanism of water penetration induced fiber orientation in overflow water‐assisted injection molding (OWAIM) parts of short glass fiber‐reinforced polypropylene (SGF/PP), in this work, the external fields and water penetration process within the mold cavity were investigated by experiments and numerical simulations. The results showed that the difference of fiber orientation distribution in thickness direction between WAIM moldings and CIM moldings was mainly ascribed to the great external fields generated by water penetration. Besides, fiber orientation depended on the position both across the part thickness and along the flow direction. Especially in the radial direction, fiber orientation varied considerably. The results also showed that the melt temperature is the principal parameter affecting the fiber orientation along the flow direction, and a higher melt temperature significantly facilitated more fibers to be oriented along the flow direction, which is quite different from the results as previously reported in short‐shot water‐assisted injection molding (SSWAIM). A higher water pressure, shorter water injection delay time, and higher melt temperature significantly induced more fibers to be orderly oriented in OWAIM moldings, which may improve their mechanical performances and broaden their application scope.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formationmechanism of high‐pressure water penetration induced fiber orientation in overflow water‐assisted injection molded short glass fiber‐reinforced polypropylene

Zhang

Liu

Jiang

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…The melts flow behavior, penetrated length, residual wall thickness, temperature, shear fields, and so on have been predicted based on the improved models . Based on Hele–Shaw flow model (which is widely used in modeling conventional injection molding (CIM)), Li et al and Zhang et al studied the residual wall thickness of tubes through computer simulations, and Zhang et al put forward the model and numerical simulation method for the second penetration (water injection).…”

Section: Current Researchmentioning

confidence: 99%

“…In order to achieve a better pressure control performance of the injecting water to meet the requirements of the WAIM, the proportional pressure control of the WAIM system was reported both numerically and experimentally . The simulation results indicate that a high flow area water injector is more suitable for the pressure control, and the increase of integrator gain could lead to overshoot and oscillation phenomena.…”

Section: Current Researchmentioning

confidence: 99%

Overview of the Experimental Trends in Water‐Assisted Injection Molding

Liu

Pan

Zheng

et al. 2018

Macro Materials & Eng

View full text Add to dashboard Cite

In recent years, a new and promising polymer processing technology known as water‐assisted injection molding (WAIM) has attracted attention not only for academic reasons but also for its industrial applications. WAIM technology provides a new way to fabricate hollow or other complicated products due to its faster cycling time and light weight. This paper aims to give an overview of the basic principles and applications of WAIM as well as the current research status in academia. The origin and development of WAIM technology are first described and then, their advantages and applications are given. This review focuses on the experimental trends of WAIM such as computer simulation, the effect of processing parameters on the WAIM samples, and the morphology as well as related WAIM–molded composites and polymer blends' work.

show abstract

“…The sleeve of the gap seal is hosted in the cylinder block, which creates a sealing surface by combining the gap, seal length, pressure, and viscosity of the working medium. 21…”

Section: Introductionmentioning

confidence: 99%

Tribological behavior of tribo-pairs in water hydraulic radial piston pumps

Wei

Líu

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

Friction and wear tests were performed on five Cu-based materials and three polyether ether ketone (PEEK)-based composites sliding against 17-4PH and 42CrMo4 coated with tungsten carbide-reinforced Ni-based coating. Two types of pin-on-disk specimens were used to represent the slipper/eccentric drive and piston/sleeve gap seal tribo-pairs in water hydraulic radial piston pumps. The experimental results showed that the QSn8-0.3 slipper material exhibited the highest steady-state friction coefficients for sliding against both 17-4PH (0.156) and coated-42CrMo4 (0.894). Glass fiber-reinforced PEEK exhibited the highest steady-state friction coefficients for sliding against the two specimens (0.540 and 0.420). The ZCuPb15Sn8/17-4PH showed the highest wear rate for the representative slipper/eccentric drive tribo-pair (26.86 × 10−6 mm/Nm); glass fiber-reinforced PEEK/17-4PH showed the highest wear rate for the representative piston/sleeve gap seal tribo-pair (46.91 × 10−6mm/Nm). The wear mechanisms of the two types of tribo-pairs were characterized through scanning electron microscopy, profilometry, and energy-dispersive spectroscopy analyses. Furthermore, the effects of hardness, pv values, coating, and reinforcement on the tribological behavior of the two types of tribo-pairs were analyzed.

show abstract

Simulation and experiment research on the proportional pressure control of water-assisted injection molding

Cited by 9 publications

References 12 publications

Formationmechanism of high‐pressure water penetration induced fiber orientation in overflow water‐assisted injection molded short glass fiber‐reinforced polypropylene

Formationmechanism of high‐pressure water penetration induced fiber orientation in overflow water‐assisted injection molded short glass fiber‐reinforced polypropylene

Overview of the Experimental Trends in Water‐Assisted Injection Molding

Tribological behavior of tribo-pairs in water hydraulic radial piston pumps

Contact Info

Product

Resources

About