Abstract
In this article cold extrution of carbon electrodes using the direct extrusion die that is designed using one of the theoretical concepts, Constancy of the Ratio of the Successive Generalized Homogeneous Strain-increment (CRHS), is presented. On the basis of the above concept we used three types of dies that are categorized as uniform (UCRHS),accelerated (ACRHS),and decelerated (DCRH) according to the deformation rates. All dies were with fixed reduction area of 50%. The mixture used (filler with binder) was extruded in round section carbon electrodes carried out at 60oC to 80oC. Ten samples are produced and tested for properties such as electrical resistivity, hardness, density and porosity. The results show that the extrusion die UCRHS is the more efficient die design for the production of carbon electrodes.
Highlights
March, 2009 generalised die profiles, such as conic functions by Chen and Ling (1968) and streamline by Yang et al (1986) were used in creating uniform extrusion flow and obtaining smaller extrusion load
The results show that the extrusion die UCRHS is the more efficient die design for the production of carbon electrodes
The current study focused on the application of CRHS dies for the cold extrusion of carbon electrodes
Summary
Extrusion is used to produce the large electrodes for electric furnaces, small rods for dry cell batteries, finer grained graphite for molds used by the metallurgical industry, electrolytic anodes, and the bulk material from which certain motor and generator brushes are made. Metal extrusion is a near-net-shape manufacturing process that can reduce the machining tasks. This process can be used to produce long and straight extrusion product such as gear spline, bar, wire, and seamless pipe. As far as the authors are aware, use of CRHS dies for extrusion of carbon electrodes has not been published so far. Against this background, the current study focused on the application of CRHS dies for the cold extrusion of carbon electrodes. It has been found that UCRHS die design is the best for the application
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