– Evaluation of Pulverised Strands of Cissus Populnea as Binder for Production of Foundry Cores –
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ABSTRACT
Core binding properties of pulverised strands of cissus populnea plant were evaluated with the view to adding to the list of core binders available locally. The strands of cissus populnea were extracted from the stem of the plant, dried and milled to obtain a fine powder that was sieved using sieve aperture of +200. Chemical analysis of the pulverised strands showed that it had 6.1% fatty acids (lipids).
Further analysis of the lipids showed that the pulverised strands had 61.76% Freidelan-3-one by weight of the lipids. Cores were produced using this powder as binder. The cores were baked at temperatures of 160, 180 and 2000C for a period of 1 to 2hours respectively.
Baking time was varied at 30 minutes intervals. The maximum baked tensile strength of 1380KN/m2 was developed at a binder content level of 7% at a baking time of 1.5hrs and baking temperature of 1600C.
A mathematical model was used to ascertain the reliability of the experimental data. This model produced a coefficient of +0.99 which quite confirms the reliability of the process. Trial casting of grey cast iron were made utilizing cores made with above composition while a mix containing 5% binder, 7% water, 0.5% cassava starch and 87.5% sand, baking time of 1.5hours and baking temperature of 1600C was used to make moulds and cores for the casting of aluminium alloys.
INTRODUCTION
Foundry is the most basic input to the metal forming industry. Stringent demands of quality and quantity are being placed on it with rapid industrialization of other fields as mentioned above. Generally, foundry deals with the process of making castings in moulds formed in either sand or some other material.
In the metal casting process, materials and design are of the utmost importance in creating a flawless part, but success also depends on the core. In the course of making castings containing hollow cavities, cores are employed. For the purpose of sand casting, cores are sand shapes which form the contour of a casting that is not moulded with a pattern.
They are thus used in forming internal cavities thus providing the casting process its ability to make most complex and intricate of shapes thus eliminating much machining (Dergamo et al., 2003; Hiene et al., 2004). Cores are also used in injection moulding. If the wrong sand binder is used, cores can degrade too quickly resulting in malfunctioned part, or worse, not break down sufficiently when being removed.
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