Results 251 to 260 of about 63,948 (294)

Cold drawing of polymers: Plasticity and aging

Journal of Non-Crystalline Solids, 2006
Abstract 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, C. Alba-Simionesco, F. Lequeux, H. Montès   +3 more
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The necking and cold-drawing of rigid plastics

Polymer, 1960
Abstract 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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Repeated Cold Drawing and Annealing of Polypropylene

Journal of Applied Physics, 1967
Samples of polypropylene were cold drawn to a maximum extension of five times their original length and then annealed, under no load, at 160°C. Eighty percent of the extension was recovered on annealing. Samples were then redrawn and annealed again repeating the procedure through five drawing cycles.
Richard G. Crystal, David Hansen
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Lubrication in Cold Rolling and Drawing of Pipe

Steel in Translation, 2018
The use of lubricant in the cold rolling and drawing of pipe is considered in theoretical and practical terms. Its use proves positive. The transfer of lubricant to the deformation region is analyzed, as well as the influence of the lubricant on the surface microrelief of the pipe. Experimental data and industrial practice are analyzed. Recommendations
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Cold Pressing and Drawing—The Metallurgical Aspect

Proceedings of the Institution of Automobile Engineers, 1934
The process of cold pressing can only be applied to the more ductile metals, and the greater part of the material so treated is in the form of thin sheets. Leaving out of account such exceptional materials as lead, a ductile metal is appreciably hardened in the process, losing some of its ductility and having its “elastic limit” raised.
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Precision of the tubes produced by drawing and cold rolling

2015
This paper presents the drawbacks of tube cold deformation classical processes such as drawing through stationary dies and cold rolling by rolls and rollers. Large assortments of cold-deformed tubes are produced by these methods. In order to increase their quality, several improvements of cold deformation methods have been suggested. At the first stage,
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Thermal Mechanism of Cold-Drawing of Polymers

1970
The phenomenon of cold-drawing (formation and steady propagation of an abrupt contraction — “necking” — in stretching cylindrical samples) is one of the qualitative peculiarities of polymers and plays an important role in the production processes of strong fibres [1–4].
G. I. Barenblatt, V. M. Entov, A. E. Segalov   +2 more
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Improving the Drawing and Cold-Rolling of Tubes

Metallurgist, 2015
Certain 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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Cold Rolling. Deep Drawing. Wire Drawing. Coatings

2021
Luis Felipe Verdeja González, Daniel Fernández González, José Ignacio Verdeja González   +2 more
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Extrusion, Tube-making and Cold Drawing

1969
The 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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