Results 211 to 220 of about 61,202 (261)
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Journal of the Textile Institute Proceedings, 1958
An investigation has been made into the variation in shape of the loadelongation curve of undrawn polyhexamethylene adipamide (nylon 6.6) filaments with change in ambient conditions, isotropic refractive index of the undrawn filament and speed of extension at low speeds of extension (0.008cm/sec–0.43cm/sec). The interaction of these variables and their
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An investigation has been made into the variation in shape of the loadelongation curve of undrawn polyhexamethylene adipamide (nylon 6.6) filaments with change in ambient conditions, isotropic refractive index of the undrawn filament and speed of extension at low speeds of extension (0.008cm/sec–0.43cm/sec). The interaction of these variables and their
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Numerical Analysis of Cold Drawing of Tubes
1988Up to now, empirical design of tubes multi-pass drawing schemes remains frequent. So, to improve the design, a new three steps strategy is developed: step one testing and grading the involved schemes set with kinematic and static element approaches; step two testing the selected scheme with analogical experiments; step three testing again the selected ...
J. M. Rigaut +4 more
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Extrusion, Tube-making and Cold Drawing
1969The process of extrusion consists of forcing a billet of metal through a die to produce a continuous length of constant cross section corresponding to the shape of the die orifice. A simple analogy of the process is the squeezing of toothpaste from a tube.
J. D. Radford, D. B. Richardson
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The necking and cold-drawing of rigid plastics
Polymer, 1960Abstract The phenomena of necking and cold-drawing have been examined theoretically and experimentally with polythene mouldings and unplasticized polyvinyl chloride sheet. It has previously been thought that these phenomena are caused by adiabatic heating of the sample. As a consequence of these investigations, we now believe the following. 1. (1)
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2019
Precision cold-drawn tubes are produced by cold drawing and cold pilgering. The cold drawing of the tubes is carried out at the so called draw bench, where the diameter of the tube from a larger diameter to the smaller is drawn through the die of certain dimensions.
Tarandek, Patrik +4 more
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Precision cold-drawn tubes are produced by cold drawing and cold pilgering. The cold drawing of the tubes is carried out at the so called draw bench, where the diameter of the tube from a larger diameter to the smaller is drawn through the die of certain dimensions.
Tarandek, Patrik +4 more
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The cold drawing of amorphous polyethylene terephthalate
Journal of Materials Science, 1975The cold drawing of amorphous polyethylene terephthalate has been studied at constant strain rate over a wide range of temperatures for samples of different molecular weight and different initial molecular orientation (pre-orientation). The natural draw ratio was found to be dependent on pre-orientation, confirming previous studies, and for low degrees
J. S. Foot, I. M. Ward
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The cold-drawing of high density polyethylene
Journal of Materials Science, 1970The cold-drawing of high density polyethylene has been studied over a wide range of temperatures and strain rates for a series of samples of very different molecular weight distribution. A natural draw-ratio was observed which was almost independent of temperature and strain rate, but was sensitive to the weight average molecular weight.
J. M. Andrews, I. M. Ward
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Improving the Drawing and Cold-Rolling of Tubes
Metallurgist, 2015Certain trends in the improvement of the operations that are carried out to make cold-deformed tubes are discussed and “technological niches” are identified. Mathematical modeling is performed of the operations executed in roller drawing through one and two roller dies, periodic drawing, and the nonuniform reduction of circular tubes that vary in the ...
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Production of duplex tubes by cold drawing
Metals Technology, 1978AbstractAn analytical solution based on the upper-bound technique is derivedfor coldplug drawmg of duplex tubes. A kinematically admissible axisymmetric velocity field is proposed which takes into account the strength and volume ratio of the component materials, redundant work, friction, and strain hardening. This analysis is considered to be the first
M. N. Islam, A. N. Bramley
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Cold drawing of polymers: Plasticity and aging
Journal of Non-Crystalline Solids, 2006Abstract Physical aging and mechanical deformation on polyisobutylmethacrylate (PIBMA) and polymethylmethacrylate (PMMA) have been investigated below but close to the glass transition temperature using calorimetry and elastic neutron scattering. We have studied the effect of physical aging before, during and after the deformation on the mechanical ...
F. Casas +3 more
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