An Immune-Enhanced Unfalsified Controller for a High-Speed Spinning Process

2011 ◽  
pp. 19-24 ◽  
Author(s):  
Lezhi Wang ◽  
Yongsheng Ding ◽  
Kuangrong Hao ◽  
Xiao Liang
Keyword(s):  
High Speed ◽  
Spinning Process

Numerical simulation of airflow characteristics in the spinning zone at starting time of air-jet spinning machine

2018 ◽  
Vol 89 (12) ◽  
pp. 2342-2352
Author(s):  
Thi Viet Bac Phung ◽  
Akihiro Yoshida ◽  
Yoshiyuki Iemoto ◽  
Hideyuki Uematsu ◽  
Shuichi Tanoue
Keyword(s):  
Fiber Bundle ◽  
High Speed ◽  
Three Dimensional ◽  
Swirl Flow ◽  
Air Pressure ◽  
Suction Force ◽  
Starting Time ◽  
Air Jet ◽  
Spinning Process ◽  
Center Axis

To clarify the formation mechanism of a source of yarn and to discuss the effects of supplied air pressure and exhaust air pressure on the fiber suction force and twist torque at the starting time of the spinning process in an air-jet spinning machine, we simulated, numerically, the three-dimensional airflow pattern without fibers in the spinning zone. Results obtained are as follows: High-speed air jetted through the starting nozzles into the yarn duct in the circumferential direction causes a swirl flow in the yarn duct and a negative pressure region near the center axis of the yarn duct. Hence, air and fibers at the fiber inlet are sucked through the processing duct into the yarn duct. A fiber bundle sucked into the yarn duct rotates, owing to the action of the swirl airflow, and twists the fiber bundle in the processing duct, hence generating a source of yarn. The fiber suction force takes a distribution with a peak against the supplied air pressure and is independent of the exhaust air pressure. The fiber twist torque increases monotonously with supplied air pressure.

Effects of modified air quenches on the high-speed melt spinning process

1991 ◽  
Vol 43 (8) ◽  
pp. 1511-1520 ◽  
Author(s):  
J. F. Hotter ◽  
J. A. Cuculo ◽  
P. A. Tucker
Keyword(s):  
High Speed ◽  
Melt Spinning ◽  
Spinning Process

The oscillation of fiber in high speed melt spinning process

2004 ◽  
Vol 2004.42 (0) ◽  
pp. 143-144
Author(s):  
Masayuki HAMADA ◽  
Satoru HARAMI ◽  
Katsuju IGARI ◽  
Yoshiyuki AOYAMA
Keyword(s):  
High Speed ◽  
Melt Spinning ◽  
Spinning Process

Numerical simulation of the airflow field in vortex spinning processing

2018 ◽  
Vol 89 (6) ◽  
pp. 1113-1127 ◽  
Author(s):  
Shanshan Shang ◽  
Jianping Yang ◽  
Chongwen Yu
Keyword(s):  
Numerical Simulation ◽  
High Speed ◽  
Stable Process ◽  
Three Dimensional ◽  
Experimental Result ◽  
Initial State ◽  
Suction Force ◽  
Spinning Process ◽  
Airflow Field ◽  
Yarn Tenacity

Three-dimensional numerical simulation of the airflow characteristics during the whole vortex spinning process, including the initial state of the yarn drawing-in process and the normal stable process, were obtained and analyzed. Spinning experiments, with the aid of a scanning electron microscope, were adopted to verify the results of the numerical simulation. The numerical simulation results show that the turbulence phenomenon in the normal spinning process is much more obvious than that in the initial spinning process; the air streamlines move orderly in the initial spinning process, which will produce a strong suction force that will be conducive to drawing the fiber bundle into the nozzle successfully, but the trajectory of airflow is complex in the normal stable spinning process and there is an upstream airflow with the same direction as the rotating airflow to provide extra tension for the yarn, which can improve the strength of the resultant yarn. The spinning experimental result is consistent with the result predicted by numerical simulation. The research further reveals the flow regularity and the turbulent phenomenon of the high-speed rotating airflow, predicts the effect of airflow motion on the spinning effect, and is helpful for stabilizing the spinning process and improving the yarn tenacity.

Fabrication of Inner Micro-Grooved Pipes

2008 ◽  
Author(s):  
Y. Chi ◽  
R. Du
Keyword(s):  
Electrical Discharge ◽  
High Speed ◽  
Electrical Discharge Machining ◽  
Heat Pipes ◽  
Minimum Size ◽  
Width Ratio ◽  
Wire Electrical Discharge Machining ◽  
Fabrication Method ◽  
Spinning Process ◽  
The One

Heat pipes have been applied popularly in microelectronic cooling, in which grooved heat pipes are the one of main types. Most of commercial grooved heat pipes with OD 6mm have 55 grooves and the groove width is larger than 200μm, which causes the biggest drawback of grooved heat pipes having no fine anti-gravity performance. In this paper, a fabrication method of inner micro-grooved pipes is investigated. First, a die with micro-tooth was fabricated by micro wire electrical discharge machining (WEDM). Utilizing micro wire with diameter in 30μm, it can machine micro slot with minimum size of 45μm wide, the surface roughness (Ra) is smaller than 0.1μm. Then, the die forms the micro grooves on the inner wall of pipes by high-speed spinning process. Last, the grooved pipes were draw to reduce the pipe diameter further, and then smaller grooves can be formed. The experiment results show that the width of obtained grooves is less than 100μm and the depth is about 250μm. The depth-to-width ratio increases significantly. The capillary force improves by double times, so the anti-gravity performance is better.

On-line measurement of orientation development in the high-speed melt spinning process

1999 ◽  
Vol 39 (12) ◽  
pp. 2349-2357 ◽  
Author(s):  
Takeshi Kikutani ◽  
Kazuhito Nakao ◽  
Wataru Takarada ◽  
Hiroshi Ito
Keyword(s):  
High Speed ◽  
Melt Spinning ◽  
Line Measurement ◽  
Spinning Process ◽  
On Line

Consolidation by Continuous Rotary Extrusion of Aluminium Alloys Cast by the Melt Spinning Process

2014 ◽  
Vol 59 (1) ◽  
pp. 309-312 ◽  
Author(s):  
W. Szymański ◽  
M. Bigaj ◽  
M. Gawlik ◽  
M. Mitka ◽  
M. Szymanek
Keyword(s):  
Rapid Solidification ◽  
Aluminium Alloys ◽  
High Speed ◽  
Melt Spinning ◽  
Optimum Conditions ◽  
Alloy Structure ◽  
High Speed Cutting ◽  
Composition And Structure ◽  
Spinning Process ◽  
Plastic Forming

Abstract One of the methods to produce aluminium alloys of an uncommon composition and structure is by the combined process of casting with rapid solidification and the following plastic forming. When modern advanced methods of rapid cooling of the melt are used, the alloy structure solidifies as a powder in the atomiser or as ribbons when cast onto a rapidly rotating copper wheel. If optimum conditions for the process of casting and rapid consolidation are satisfied, it is possible to control some structure parameters like the size of the particles, the size of the precipitates, etc. Additionally, the production of aluminium alloys by rapid solidification allows introducing the alloying constituents that are incompatible with the state of equilibrium. The consolidation of material made by rapid solidification is achieved in one of the numerous variations of the plastic forming processes, among which the most commonly used are the direct extrusion and continuous rotary extrusion (CRE). This paper presents the results of the consolidation in the process of continuous rotary extrusion (CRE) of selected aluminum alloys with an unusually high content of alloying elements cast in the process of rapid solidification by melt spinning and crushed in a high-speed cutting mill to as ”chips”.

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