scholarly journals Worsted spinning process parameters inversion based on a mixed population genetic-ANN algorithm

2016 ◽  
Author(s):  
Jian-Guo Yang ◽  
Jing-wei Xiong ◽  
Lan Xu
Keyword(s):  
Process Parameters ◽  
Population Genetic ◽  
Mixed Population ◽  
Spinning Process ◽  
Parameters Inversion

Research on Ultimate Thinning Rate of Superalloy Spinning

2021 ◽  
Vol 1035 ◽  
pp. 152-160
Author(s):  
Hai Bao Wu ◽  
Fu Long Chen ◽  
De Gui Liu ◽  
Ji Zhen Li ◽  
Jian Fei Wang
Keyword(s):  
High Temperature ◽  
Process Parameters ◽  
Middle Level ◽  
Feed Ratio ◽  
Forming Limit ◽  
Body Parts ◽  
Influence Of Process Parameters ◽  
Process Guidance ◽  
Spinning Process ◽  
Thinning Rate

Spinning forming is an effective method for processing thin-walled rotating body parts. The influence of process parameters on the spinning forming limit of materials was studied for the four high-temperature alloys of GH3044, GH3625, GH3536 and GH4169 used in aero-engines. The results can be used as aero-engine high-temperature alloy parts spinning process and provides experimental basis and process guidance. The research results showed that the forming temperature had a significant effect on the spinning forming performance of superalloy materials. When the temperature increased to 800°C and above, the ultimate thinning rate raised 70%. The ultimate thinning rate of GH4169 was higher than the other three materials and GH3044 and GH3536 was at the middle level, GH3625 was relatively low. At the same time, the feed ratio and the corner radius of the rotary wheel had a certain influence on the ultimate thinning rate of different superalloys. The spinning process needs to select reasonable process parameters according to the actual situation when the spinning is applied to manufacture parts.

Fabrication of Carbon Nanotubes Reinforced Polyethylene Fibers by Melt Spinning: Process Optimization and Mechanical Strength Characterization

2007 ◽  
Vol 26-28 ◽  
pp. 289-292
Author(s):  
Abu Bakar Sulong ◽  
Joo Hyuk Park
Keyword(s):  
Carbon Nanotubes ◽  
Process Parameters ◽  
Melt Spinning ◽  
Polymer Fibers ◽  
Test Machine ◽  
Taguchi’S Method ◽  
Spinning Process ◽  
Strength Characterization ◽  
Surface Modified ◽  
Polyethylene Fibers

Optimization process for fabrication of Carbon nanotubes (CNTs) reinforced Polyethylene (PE) fibers by melt spinning has been studied. Three main melt spinning process parameters (spinning temperature, spinning distance, and spinning revolution) are evaluated by the Taguchi’s method to decrease the diameter of fibers. Decreasing diameter of fibers is greater influenced by spinning revolution and distance than spinning temperature. Moreover, fibers in diameter 22 μm (average) are successfully fabricated. Mechanical properties are measured by tensile test machine based on ASTM D3822 for single fibers which were fabricated at optimized melt spinning process parameters. Pure PE polymer fibers and chemically surface modified CNTs reinforced fibers also fabricated for comparison purpose. The interfacial bonding of CNTs with PE matrix is investigated through fracture surfaces image analysis by Scanning Electron Microscopy (SEM).

Numerical Analysis and Comparison of Airflow in Rotors with U and V Groove during Rotor Spinning Process

2016 ◽  
Vol 11 (4) ◽  
pp. 155892501601100
Author(s):  
Rui-Hua Yang ◽  
Chao Liu ◽  
Yuan Xue ◽  
Hongbo Wang ◽  
Weidong Gao
Keyword(s):  
Numerical Analysis ◽  
Process Parameters ◽  
Static Pressure ◽  
Optimum Process ◽  
Production Rates ◽  
Rotor Spinning ◽  
Yarn Quality ◽  
Spinning Process ◽  
High Production

Rotor spinning is known for high production rates and uniformity of the resulting yarn. However, determining machine components which will produce the optimum process parameters such as airflow speed to result in the best combinations of yarn quality and uniformity can be a difficult task. The aim of this study is to simulate and analyze the airflow characteristics in rotors with U and V grooves during the rotor spinning process. The results obtained showed that airflow speed resulting from a rotor with the V groove is higher than that of U type. As a result, the static pressure resulting from the use of the V type groove is lower than that of U groove.

scholarly journals Multiple-Jet Needleless Electrospinning Approach via a Linear Flume Spinneret

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2052 ◽  
Author(s):  
Liang Wei ◽  
Chengkun Liu ◽  
Xue Mao ◽  
Jie Dong ◽  
Wei Fan ◽  
...  
Keyword(s):  
Process Parameters ◽  
Applied Voltage ◽  
Mass Production ◽  
Solution Concentration ◽  
Average Error ◽  
High Quality ◽  
Needleless Electrospinning ◽  
Nanofiber Diameter ◽  
Multiple Jets ◽  
Spinning Process

There is a great limitation to improving the quality and productivity of nanofibers through the conventional single-needle method. Using needleless electrospinning technology to generate multiple jets and enhance the productivity of nanofibers has attracted lots of interest for many years. This study develops a novel linear flume spinneret to fabricate nanofibers. Multiple jets with two rows can be formed simultaneously on the surface of the spinneret. The solution concentration has a significant impact on the average nanofiber diameter compared with applied voltage and collection distance. The effects of different spinning process parameters on the productivity of nanofibers are investigated. High-quality nanofibers with small nanofiber diameter and error can be fabricated successfully. The average nanofiber diameter is 108 ± 26 nm. The average error is 24%. The productivity of nanofibers can reach 4.85 ± 0.36 g/h, which is about 24 times more than that of the single-needle method. This novel linear flume spinneret needleless electrospinning technology exhibits huge potential for mass production of nanofibers in the field of industrialization.

Manufacturing and Evaluation of Porous PLA Nano/Micro Fibres

2016 ◽  
Vol 368 ◽  
pp. 146-149
Author(s):  
Eva Macajová
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Image Analysis ◽  
Polymer Solution ◽  
Process Parameters ◽  
Fibre Diameter ◽  
Solution Composition ◽  
Structure And Morphology ◽  
Spinning Process ◽  
Scanning Electron

This study is mainly focused on the study of pore size and shape, fibre diameter and also on the optimization of polymer solution composition and electrospinning parameters with respect to the final structure and morphology of PLA nano/microfibrous layers. The nano/microfibres were produced by electrospinning from the needle. Except the spinning process parameters, the morphology of nanofibrous layers can be also affected by the composition of the polymer solution and by the used solvents. Variations in technological process allows us to design the shape and form of nanofibrous structures upon request. The morphology of nano/microfibres was observed by scanning electron microscopy (SEM). Following image analysis and calculation enables the assessment of porosity contribution to the increase in micro/nanofibre surface area.

scholarly journals Study on Spinning Process Parameters of the Copper Bushing by Tribological Properties and Physical Testing

2021 ◽  
Vol 2083 (2) ◽  
pp. 022084
Author(s):  
Xiaolu Hong ◽  
Hengqiu Xu ◽  
Ying Xu ◽  
Tao Huang ◽  
Yaming Guo ◽  
...  
Keyword(s):  
Fatigue Resistance ◽  
Process Parameters ◽  
Tribological Properties ◽  
Thermal Simulation ◽  
Feed Ratio ◽  
Mechanical Parts ◽  
Good Strength ◽  
Physical Testing ◽  
Spinning Process ◽  
Thinning Rate

Abstract The bushing is a kind of ring sleeve which acts as a liner outside the mechanical parts, which needs good strength, hardness and fatigue resistance. In this paper, the copper bushing was prepared by spinning forming method, and the process parameters of spinning were explored. According to the results of material thermal simulation and test, the conclusion is that the spinning process of copper bushing needs to be carried out in two passes by reverse spinning method. The thinning rate is 30% and 25% respectively. The gap between the mandrel and the roller is 10mm, the feed ratio is 1mm/r, and the spinning temperature is 250°C.

Morphological/alignment properties of thermoplastic polyurethane nanofiber affected by processing parameters

2020 ◽  
pp. 009524432096984
Author(s):  
Erdem Selver ◽  
Neslihan Karaca ◽  
Aysen Onen ◽  
Nuray Ucar ◽  
Pelin Altay
Keyword(s):  
Process Parameters ◽  
Biomedical Applications ◽  
Thermoplastic Polyurethane ◽  
Processing Parameters ◽  
Morphological Properties ◽  
Feeding Rates ◽  
Widespread Application ◽  
Nanofiber Diameter ◽  
Porous Surfaces ◽  
Spinning Process

Thermoplastic polyurethane (TPU) in nanofiber or submicron fiber has widespread application areas including the biomedical applications, such as artificial vein, cell cultivation etc. due to both TPU’s and nanofiber’s morphological properties. The morphology and aligment of nanofibers obtained from electrospinning are significantly affected by process parameters, which affect their end uses. This study aims to investigate the effect of process parameters of electrospinning (nozzle axis type, collector type, collector speed and filler types) on morphological properties (fiber orientation, fiber diameter and porous structure) of thermoplastic polyurethanes. Experimental results showed that nanofiber diameter increased with an increase of collector speed due to the relaxation of extensible TPU nanofiber after spinning process. When the rotational speed of collector reaches to 2000 rpm, the orientation could be observed. Using rotational wire collector resulted in thinner and more oriented fibers compared to rotating cylinder collector. Adding salt particles results in thinnest and highly oriented nanofiber webs. Higly porous surfaces were obtained using coaxial technique at the same feeding rates with miscible solvents for both shell and core. It was seen that using solvent with low boiling point in core may lead to higher porous surfaces. Nanofiber diameter increased using coaxial nozzle instead of single axis nozzle.

Sign in / Sign up

Export Citation Format

Share Document