scholarly journals Achievement of Automatic Copper Wire Elongation System

Algorithms ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 105
Author(s):  
Hsiung-Cheng Lin ◽  
Chung-Hao Cheng
Keyword(s):  
Copper Wire ◽  
Gear Ratio ◽  
Experimental Results ◽  
The Third ◽  
Heated Wire ◽  
The Wire ◽  
Elongation Process ◽  
Automatic Wire

Copper wire is a major conduction material that carries a variety of signals in industry. Presently, automatic wire elongating machines to produce very thin wiresare available for manufacturing. However, the original wires for the elongating process to thin sizes need heating, drawing and then threadingthrough the die molds by the manpower before the machine starts to work. This procedure repeatsuntil the wire threads through all various die molds. To replace the manpower, this paper aims to develop an automatic wire die molds threading system for the wire elongation process. Three pneumatic grippers are designed in the proposed system. The first gripper is used to clamp the wire. The second gripper fixed in the rotating mechanism is to draw the heated wire. The third gripper is used to move the wire for threading through the dies mold. The force designed for drawing the wire can be adjusted via the gear ratio. The experimental results confirm that the proposed system can accomplish the wiredies mold threading processin term of robustness, rapidness and accuracy.

scholarly journals Enhanced electrical conductivity and mechanical properties in thermally stable fine-grained copper wire

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Qingzhong Mao ◽  
Yusheng Zhang ◽  
Yazhou Guo ◽  
Yonghao Zhao
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Electrical Conductivity ◽  
Yield Strength ◽  
High Speed ◽  
Copper Wire ◽  
Rapid Development ◽  
Dislocation Slip ◽  
Ultrafine Grains ◽  
The Wire

AbstractThe rapid development of high-speed rail requires copper contact wire that simultaneously possesses excellent electrical conductivity, thermal stability and mechanical properties. Unfortunately, these are generally mutually exclusive properties. Here, we demonstrate directional optimization of microstructure and overcome the strength-conductivity tradeoff in copper wire. We use rotary swaging to prepare copper wire with a fiber texture and long ultrafine grains aligned along the wire axis. The wire exhibits a high electrical conductivity of 97% of the international annealed copper standard (IACS), a yield strength of over 450 MPa, high impact and wear resistances, and thermal stability of up to 573 K for 1 h. Subsequent annealing enhances the conductivity to 103 % of IACS while maintaining a yield strength above 380 MPa. The long grains provide a channel for free electrons, while the low-angle grain boundaries between ultrafine grains block dislocation slip and crack propagation, and lower the ability for boundary migration.

LED Display Image Correction Based on Computer Simulation

2012 ◽  
Vol 182-183 ◽  
pp. 1751-1755
Author(s):  
Xi Feng Zheng ◽  
Feng Chang
Keyword(s):  
Computer Simulation ◽  
Correction Method ◽  
Experimental Results ◽  
Image Correction ◽  
The Third

For the purposes of correcting the LED display image, a method based on computer simulation is proposed. First, the development of the LED display panel is introduced. Second, analyze the causes of the problem which image in LED display panel has serious high non-uniformity, and introduce the existed correction techniques which are used to reduce the non-uniformity of LED display image. Simultaneously, point out the ground for shortcomings of these techniques. Third, describe the principle of correction method based on computer simulation detail from two steps, which are the luminous collection and luminous copulation. Forth, describe the realization steps of this method in accordance with the third step. Finally, this method is supplied in a LED display panel, whose resolution is 640×480. Experimental results show that this method is able to reduce the non-uniformity of images from 11.06% to 0.98%..

Quanta of the Third Kind

2021 ◽  
Vol 6 (3) ◽  
Author(s):  
Frank Wilczek
Keyword(s):  
Quantum Mechanics ◽  
Experimental Results ◽  
Quantum Mechanical ◽  
The Third

Quantum mechanics is nearly one hundred years old; and yet the challenge it presents to the imagination is so great that scientists are still coming to terms with some of its most basic implications. Theoretical insights and recent experimental results in anyon physics are leading physicists to revise and expand their ideas about what quantum-mechanical particles are and how they behave.

Note on Mr Joseph O. Thompson's Results regarding Vibrating Wires

1899 ◽  
Vol 22 ◽  
pp. 598-600
Author(s):  
Dr W. Peddie
Keyword(s):  
Constant Temperature ◽  
Breaking Strength ◽  
Copper Wire ◽  
Physical Review ◽  
Logarithmic Decrement ◽  
Constant Amplitude ◽  
Vibrating Wire ◽  
Constant Quantity ◽  
The Wire ◽  
Lord Kelvin

In 1865 Lord Kelvin published the results of experiments which first made evident “a very remarkable fatigue of elasticity, according to which a wire which has been kept vibrating for several hours or days through a certain range came to rest much quicker when left to itself than when set in vibration after it has been at rest for several days and then immediately left to itself.” On the strength of Lord Kelvin's statement this elastic fatigue of metals has been regarded as a definitely ascertained fact. But, quite recently (Physical Review, March 1899), Mr Joseph O. Thompson has published a paper “On the period and logarithmic decrement of a continuously vibrating wire,” in which he states that it seems probable that “for constant temperature and constant amplitude the logarithmic decrement is constant.” This conclusion is based upon his observation that the logarithmic decrement, in the case of a copper wire, when the amplitude of vibration varied from about 185° to 175°, had the same value after it had been continuously vibrated through the average arc of 180° for fifty consecutive hours as it had at the commencement of that period. Observations upon other metals seemed to support the conclusion.Lord Kelvin also stated that fatigue caused an increase of the period of vibration. Mr Thompson finds that “no matter what metal was used, no matter whether the arc of vibration was as small as 20° or as high as 200°, no matter whether the wire was long or short, thick or thin (provided of course the breaking strength of the wire was at least twice the weight of the disc), the result was uniformly the same, namely, that when temperature and amplitude of vibration remained constant, the period of vibration was a constant quantity.”

The Production and Properties of Copper-Iron Particulate Composite Wire

1989 ◽  
Vol 203 (3) ◽  
pp. 175-184
Author(s):  
G I Lawal ◽  
D C Barton ◽  
A N Bramley ◽  
J Nutting
Keyword(s):  
Magnetic Properties ◽  
Structural Changes ◽  
Copper Wire ◽  
Particulate Composite ◽  
Iron Particle ◽  
Composite Wire ◽  
Particulate Form ◽  
Increasing Process ◽  
The Wire ◽  
Magnetic Hardness

A novel means of producing copper-based powder metallurgy wire containing sufficient iron in particulate form to impart useful magnetic properties has been investigated. The method, which involves encapsulating a powder mixture within a copper tube prior to rolling and die-drawing operations, has been successfully used to produce composite wire of diameter range 1.8-0.4 mm. Particular attention has been paid to the effect of composition, processing strain, heat treatment and iron particle size on the electrical, mechanical and magnetic properties of the wire. Microscopy studies have also been carried out to determine structural changes in the material during processing. It was found that the good conductivity and ductility of solid copper wire was not greatly reduced provided (a) the iron content of the composite wire was kept fairly low (<6 per cent) and (b) the annealing temperature was not sufficiently high for significant alloying to take place (650°C maximum). Saturation magnetization values increased with increasing process strain, as did the magnetic hardness. The latter, however, could be minimized by fully annealing the iron after processing the wire. The magnetic properties were undoubtedly influenced by the size and shape of the iron particles, smaller particles being more easily elongated and tending to give greater magnetic hardness.

Coordinated Excitation of Flexor Inhibitors in the Crayfish

1980 ◽  
Vol 86 (1) ◽  
pp. 187-195
Author(s):  
CHIKAO UYAMA ◽  
TAKASHI MATSUYAMA
Keyword(s):  
Giant Axon ◽  
Experimental Results ◽  
Abdominal Ganglion ◽  
Giant Axons ◽  
The Third ◽  
Nerve Cords

In isolated abdominal nerve cords of crayfish, the medial or lateral giant axons were stimulated at a position just rostral to the first abdominal ganglion. Recordings of the impulse sequences of the flexor inhibitor (FI) were made from the anterior five ganglia, three ganglia at a time. In 20% of our preparations, one giant axon impulse caused one to four FI impulses in every abdominal third root. An equal number of FI impulses were usually produced by each abdominal ganglion for any given stimulation. The earliest FI impulse was observed at the third root of the fourth ganglion. FI impulses occurred with increasing latencies rostrally and caudally from the fourth ganglion. The FI responses to medial and lateral giant axons stimulation were essentially equivalent. FI impulses were recorded from the rostral three abdominal ganglia, while the caudal ganglia were cut off one after another from the sixth to the third ganglion. Little change was noted until after the removal of the fourth ganglion, which usually caused all FI impulses to disappear. From these experimental results, we propose a model of central mechanisms for FI excitation.

An Analytical Model for the Effective Dielectric Constant of a 0-3-0 Composite

2010 ◽  
Author(s):  
K. A. Cook-Chennault ◽  
S. Banerjee
Keyword(s):  
Dielectric Constant ◽  
Aspect Ratio ◽  
Analytical Model ◽  
Experimental Results ◽  
Effective Dielectric Constant ◽  
The Third ◽  
Third Phase ◽  
Three Phase ◽  
Phase 0 ◽  
Experimental Values

An analytical expression for prediction of the effective dielectric constant of a three phase 0-3-0 ferroelectric composite is presented. The analytical results are verified with the experimental results from Nan et al [1]. We extend the analytical model, so that the influence of the shape of the third phase inclusion, on the effective dielectric constant of the composite, can be investigated. The results indicate that the dielectric constant increases ∼7 times, when the aspect ratio of the conductive inclusion is increased from 1 (sphere) to 10 (spheroid). The analytical predictions compare favorably with the experimental values.

Ab Initio Study the Transport Properties of Alumium-Phosphorus Dopped Si Atomic Nanowire

2011 ◽  
Vol 391-392 ◽  
pp. 1128-1131
Author(s):  
You Lin Peng ◽  
Yan Hong Zhou ◽  
Li Li Zhou
Keyword(s):  
Transport Properties ◽  
Silicon Atom ◽  
Density Functional ◽  
First Principles Calculation ◽  
Functional Theory ◽  
Pure Silicon ◽  
The Third ◽  
Current Voltage ◽  
The Density Functional Theory ◽  
The Wire

We perform first-principles calculation of the transport properties of alumium-phosphorus dopped Si atomic nanowire coupled to two Al(100) nanoscale electrodes using the non-equilibrium Green formalism combined with the density-functional theory. In particular, the alumium-phosphorus dopped silicon wire with seven atoms sandwiched between the Al(100) electrodes is considered. It is found that the transport properties are sensitive to the dopping position of the alumium and the phosphorus on the silicon wire. The equilibrium conductance of the pure silicon wire is rather big, close to 3 G0, Three eigenchannels which contribute to the equilibrium conductance are fully open. All cases of the alumium-phosphorus dopping reduce the conductivity of the pure silicon wire. In particular, the conductance of the wire decreases to 0.7 G0 when a phosphorus substitutes the third silicon atom and a alumium substitutes the sixed silicon atom. The current-voltage(I-V) curves of these cases vary dramatically. The current across the wire with a phosphorus substitutes the third silicon atom and a alumium substitutes the sixed silicon atom is rather smaller than the that across the pure silicon. A detailed analysis of the transmission coefficient of the eigenchannels, the projected density of states are made to reveal the mechanism of the differences.

scholarly journals Anisotropic Thermal Response of Packed Copper Wire

2017 ◽  
Vol 9 (4) ◽  
Author(s):  
Andrew A. Wereszczak ◽  
J. Emily Cousineau ◽  
Kevin Bennion ◽  
Hsin Wang ◽  
Randy H. Wiles ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Copper Wire ◽  
Thermal Response ◽  
Laser Flash ◽  
Test Methods ◽  
Element Analysis ◽  
Fea Model ◽  
Apparent Thermal Conductivity ◽  
The Wire ◽  
Packing Efficiency

The apparent thermal conductivity of packed copper wire test specimens was measured parallel and perpendicular to the axis of the wire using laser flash, transient plane source, and transmittance test methods. Approximately 50% wire packing efficiency was produced in the specimens using either 670- or 925-μm-diameter copper wires that both had an insulation coating thickness of 37 μm. The interstices were filled with a conventional varnish material and also contained some remnant porosity. The apparent thermal conductivity perpendicular to the wire axis was about 0.5–1 W/mK, whereas it was over 200 W/mK in the parallel direction. The Kanzaki model and an finite element analysis (FEA) model were found to reasonably predict the apparent thermal conductivity perpendicular to the wires but thermal conductivity percolation from nonideal wire-packing may result in their underestimation of it.

scholarly journals Effect of Process Parameters in Copper-Wire Drawing

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 105 ◽  
Author(s):  
Gustavo Aristides Santana Martinez ◽  
Wei-Liang Qian ◽  
Leonardo Kyo Kabayama ◽  
Umberto Prisco
Keyword(s):  
Hydrodynamic Lubrication ◽  
Copper Wire ◽  
Wire Drawing ◽  
Drawing Process ◽  
Stress Distributions ◽  
Operational Parameters ◽  
Die Geometry ◽  
Drawing Speed ◽  
Industrial Productivity ◽  
The Wire

The efforts to increase the operating speed of the wire drawing process play a crucial role regarding the industrial productivity. The problem is closely related to various features such as heat generation, material plastic deformation, as well as the friction at the wire/die interface. For instance, the introduction of specific lubricants at the interface between the die and the wire may efficiently reduce the friction or in another context, induce a difference in friction among different regimes, as for the case of hydrodynamic lubrication. The present study systematically explores various aspects concerning the drawing process of an electrolytic tough pitch copper wire. To be specific, the drawing speed, drawing force, die temperature, lubricant temperature, and stress distributions are analysed by using experimental as well as numerical approaches. The obtained results demonstrate how the drawing stress and temperature are affected by the variation of the friction coefficient, die geometry, and drawing speed. It is argued that such a study might help in optimizing the operational parameters of the wire drawing process, which further leads to the improvement of the lubrication conditions and product quality while minimizing the energy consumption during the process.

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