Effects of gas-assisted extrusion on slip in the cable coating process

Yin, Hongna; Huang, Xingyuan; Liu, Tongke; Song, Minjie

doi:10.1515/polyeng-2020-0287

Cited by 6 publications

(3 citation statements)

References 28 publications

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“…In order to improve the solidification rate of melt during CASTEX, YIN et al [3] proposed a novel technique named as gas-assisted continuous casting and extrusion (GAC). The principle of GAC is shown in figure 1.…”

Section: Introductionmentioning

confidence: 99%

Cooling rate calculation of pure aluminum solidified during a novel gas-assisted continuous casting and extrusion process

Xie,

Yin,

Luo

et al. 2023

Eng. Res. Express

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Gas-assisted continuous casting and extrusion (GAC) process is a novel technique for the continuous preparation of non-equilibrium solidified materials. To evaluate the solidification rate of the melt during GAC, the cooling rate of pure aluminum melt solidified in the wheel groove is calculated, based on the Newtonian heat transfer model and the one-dimensional Fourier heat transfer model. Results show that the cooling rate of the melt during GAC mainly depends on the conduction heat transfer in the wheel groove and the melt thickness. When the thickness of the pure aluminum melt is between 1 and 2.5 mm, the cooling rate can reach 103-104 K s-1, which is much higher than that in CAXTEX (~10 K s-1). It means that GAC is a very effective process in the preparation of non-equilibrium solidification alloys.

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Section: Introductionmentioning

confidence: 99%

Cooling rate calculation of pure aluminum solidified during a novel gas-assisted continuous casting and extrusion process

Xie,

Yin,

Luo

et al. 2023

Eng. Res. Express

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show abstract

“…The application of gas-assisted techniques in the extrusion of plastic micro-tubes can effectively tackle these challenges by transforming the molten material within the die from a viscous flow to a slip flow regime [24][25][26][27][28]. Liang [29] introduced the slit inlet method, which utilizes gas-assisted technology to create a stable air cushion between the mold and the polymer melt, resulting in a significant reduction in die resistance.…”

Section: Introductionmentioning

confidence: 99%

Influence of Gas Inlet Slit Width on Gas-Assisted Plastic Micro-Tube Extrusion

et al. 2023

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In the process of the double-layer gas-assisted extrusion of plastic micro-tubes, the external size and surface quality of the micro-tubes are greatly affected by the size of the assisting gas inlet slit inside the mold. Therefore, in this experiment, a two-phase flow model was established based on a compressible gas and a non-compressible melt. The Polyflow finite element solution software module was used to solve the velocity field, temperature field, pressure field, and section size of the melt under the condition of double-layer gas-assisted extrusion in a mold under different gas inlet slit widths. The results show that, with an increase in the width of the gas inlet slit, the melt outlet velocity increases, the surface temperature increases, wall thickness shrinkage increases, and interior diameter expansion increases. In the process of gas-assisted extrusion, the thickness of the air cushion is affected by adjusting the size of the gas inlet slit, and, hence, changes the shape and size of the plastic micro-tubes.

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“…Gas-assisted extrusion technology involving the introduction of gas between the die and the melt can change the melt in the die from adhesive flow to slip flow, which can reduce the shear stress of the melt in the die and effectively eliminate the problem of extrusion expansion and distortion [ 20 , 21 , 22 ]. Gas-assisted extrusion technology can significantly improve production efficiency, save energy consumption, and improve product size accuracy [ 23 ]. However, the influence mechanism of complex process parameters on the coupling of microtubular external dimensions is not clear, which has some limitations in practical applications.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Studies on the Improvement of Gas Chamber Structure during Gas-Assisted Extrusion

et al. 2022

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In the gas-assisted extrusion process, the melt inside the die is in a low-viscosity molten state, so the flow field of the gas cushion layer has a great effect on the cross-sectional shape of the micro-tube. Therefore, this study establishes the gas distribution chamber model of the gas-assisted die. Ansys Fluent software was used to simulate the gas flow field of the gas distribution chamber. The effect of the gas chamber structure on the size of the micro-tube was analyzed by the extrusion experiment. The research shows that the velocity unevenness coefficient of the gas outlet of the single gas chamber die is 11.8%, which is higher than that of the double gas chamber die. The use of a double gas chamber die can improve the stability of the gas cushion layer and the wall thickness non-uniformity of the micro-tube, which verifies the simulation results.

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Effects of gas-assisted extrusion on slip in the cable coating process

Cited by 6 publications

References 28 publications

Cooling rate calculation of pure aluminum solidified during a novel gas-assisted continuous casting and extrusion process

Cooling rate calculation of pure aluminum solidified during a novel gas-assisted continuous casting and extrusion process

Influence of Gas Inlet Slit Width on Gas-Assisted Plastic Micro-Tube Extrusion

Numerical and Experimental Studies on the Improvement of Gas Chamber Structure during Gas-Assisted Extrusion

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