scholarly journals Novel on-line twist extrusion process for bulk magnesium alloys

2019 ◽  
Vol 182 ◽  
pp. 108011 ◽  
Author(s):  
J. She ◽  
P. Peng ◽  
A.T. Tang ◽  
J.Y. Zhang ◽  
J.J. Mao ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Extrusion Process ◽  
Twist Extrusion ◽  
On Line

scholarly journals Experimental and modelling aspects of the reactive extrusion process

2019 ◽  
Vol 20 (8) ◽  
pp. 803 ◽  
Author(s):  
Philippe Cassagnau ◽  
Véronique Bounor-Legaré ◽  
Bruno Vergnes
Keyword(s):  
Chemical Reactor ◽  
Reactive Extrusion ◽  
Extrusion Process ◽  
Industrial Applications ◽  
Twin Screw Extruders ◽  
Single Screw Extruders ◽  
Twin Screw ◽  
On Line ◽  
Screw Extruders ◽  
Continuous Chemical

Reactive extrusion consists in using an extruder as a continuous chemical reactor. It is not a recent process, but it has been rapidly developed during the last thirty years and is more and more used today for the chemical modification of existing polymers. Among the various extrusion systems (single screw extruders, counter- and corotating twin-screw extruders, co-kneaders), the corotating twin-screw extruders are today the most widely used in reactive extrusion. After a presentation of the main advantages and drawbacks of the reactive extrusion, we will describe the way to control the process through on-line and in-line monitoring. Then, a modelling approach based on continuum mechanics will be presented, followed by an example of industrial applications of this particular process.

On-Line Monitoring of Molecular Weight Using NIR Spectroscopy in Reactive Extrusion Process

2013 ◽  
Vol 333 (1) ◽  
pp. 138-141 ◽  
Author(s):  
Björn Bergmann ◽  
Wolfgang Becker ◽  
Jan Diemert ◽  
Peter Elsner
Keyword(s):  
Molecular Weight ◽  
Nir Spectroscopy ◽  
Reactive Extrusion ◽  
Extrusion Process ◽  
On Line ◽  
Reactive Extrusion Process

On-Line Rheometry for Twin-Screw Extrusion (Along the Extruder) and its Applications

2002 ◽  
Vol 12 (1) ◽  
pp. 18-24 ◽  
Author(s):  
J. M. Maia ◽  
O. S. Carneiro ◽  
A. V. Machado ◽  
J. A. Covas
Keyword(s):  
Reactive Systems ◽  
Reactive Extrusion ◽  
Extrusion Process ◽  
Experimental Conditions ◽  
Capillary Rheometry ◽  
Existing Problems ◽  
Twin Screw ◽  
On Line ◽  
Dispersive Mixing ◽  
Carbon Fibre Composites

Abstract Due to a number of practical difficulties, both in- and on-line measurements of the rheological properties of complex systems during extrusion are usually performed at the end of the extruder, under very specific experimental conditions. This makes this type of instruments more useful for quality control than for process optimisation, since information about the influence of the geometry and/or processing conditions on the evolution of the material characteristics inside the extruder is not easily gathered. Recently, however, the authors have developed an on-line capillary rheometry system that overcomes most of the existing problems and allows small amounts of sample to be tested in very near real time, along the extruder. The present work aims at illustrating the usefulness of this concept for the study of physical compounding processes and some reactive systems. Two very different systems will be used for that purpose: a reactive extrusion process (the peroxide-induced thermal degradation of polypropylene) and the dispersive mixing involved in the preparation of thermoplastic/carbon fibre composites.

Microstructure and Mechanical Properties of Twist Extruded Pure Aluminum Processed by Post-Rolling

2011 ◽  
Vol 264-265 ◽  
pp. 183-187 ◽  
Author(s):  
S. Ranjbar Bahadori ◽  
Seyed Ali Asghar Akbari Mousavi ◽  
A.R. Shahab
Keyword(s):  
Grain Size ◽  
Pure Aluminum ◽  
Rolling Process ◽  
Extrusion Process ◽  
Ultrafine Grained ◽  
Twist Extrusion ◽  
Aluminum Sample ◽  
Deformation Processes ◽  
Ultrafine Grained Materials ◽  
Extrusion Method

Interest in processing of bulk ultrafine-grained materials has grown significantly over the last years. Severe plastic deformation processes such as twist extrusion have been the essence of these researches and used to decrease the bulk grain size. The bulk gain size can reduce if twist extrusion process combines with a conventional forming technique. In this study, the effects of reduction by employing the rolling process after the twist extrusion method were considered. The twist extrusion process of the commercially pure aluminum sample was carried out using a twisted die with 60º die angle, and the samples were processed through rolling subsequently. As a result of rolling, average microstructure grain size decreased significantly and the hardness amount increased accordingly

Wheel-Tooling Gap Measurement System for Conform™ Extrusion Machinery Based on a Capacitive Sensor

2005 ◽  
Vol 127 (2) ◽  
pp. 394-401 ◽  
Author(s):  
K. Khawaja ◽  
L. Seneviratne ◽  
K. Althoefer
Keyword(s):  
Measurement System ◽  
Capacitive Sensor ◽  
Extrusion Process ◽  
Monitoring And Control ◽  
Sensing System ◽  
Gap Measurement ◽  
Wide Range ◽  
On Line ◽  
And Control ◽  
First Time

Conform™ extrusion is a very versatile manufacturing process enabling the production of a wide range of extruded profiles. It is critical to maintain a precise predefined wheel-tooling gap for the efficient running of the Conform extrusion process and to maintain high product quality. However, this is a challenging task due to the hostile environment, high operating temperatures, and required accuracy. An accurate high-temperature gap measurement system for Conform extrusion machinery, using a capacitive sensing system, is developed in this study. The sensor is implemented in a copper Conform extrusion machine, and experimental results are presented, providing for the first time a detailed view of Conform Extrusion gap behavior during production. It is shown that the proposed gap-sensing and control system results in a number of advantages, including reduced machine setup times, reduced flash (waste) rates, and on-line monitoring and control of gap size. The research is carried out in collaboration with Holton Machinery Ltd., a leading manufacturer of Conform Extrusion machinery.

Effect of Process Parameters on the Microstructure Homogeneity of AA6082 Aluminum Alloy Deformed by Twist Extrusion

2013 ◽  
Author(s):  
V. S. Senthil Kumar ◽  
U. Mohammed Iqbal
Keyword(s):  
Aluminum Alloy ◽  
Process Parameters ◽  
Effective Strain ◽  
Extrusion Process ◽  
Work Piece ◽  
Hardness Testing ◽  
Twist Extrusion ◽  
Experimental Values ◽  
3D Software ◽  
Deform 3D

Twist extrusion is a severe plastic deformation in which the rectangular shaped work piece is extruded through a die with a twist channel. In this work the twist extrusion process of AA6082 T6 aluminum samples were carried out to investigate the effects of process parameters like temperature and deformation passes on the microstructure homogeneity. The results indicate that the grain refinement of AA 6082 T6 aluminum alloy leads to inhomogeneous microstructure after one twist extrusion pass. On further extrusion passes the inhomogeneity in the microstructure is found to be disappeared. The homogeneity of the distribution of the deformation was confirmed by micro hardness testing. Finite element modeling has been performed in DEFORM 3D software for determining the homogeneity of the effective strain distribution which agreed well with the experimental values.

Improved tension/compression asymmetry achieved in high-strength magnesium alloys via compression-extrusion process

2018 ◽  
Vol 736 ◽  
pp. 239-247 ◽  
Author(s):  
Haixuan Wang ◽  
Lixin Zhang ◽  
Wenzhen Chen ◽  
Daqing Fang ◽  
Wencong Zhang ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
High Strength ◽  
Extrusion Process ◽  
Tension Compression Asymmetry
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