Testing of Already Existing and Developing New Compaction Equations during Cold Die Compaction of Iron-1.05% Graphite Powder Blends
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2014, Vol 4, Issue 10
Abstract
Powder Metallurgy (P/M) processing of materials to produce conventional P/M parts involve the compaction of the pre-determined mass of individual elemental, mixed elemental metal powders or alloy powders and or composite powders into green compacts and sintering them under reducing atmosphere and or under other protective coatings, thus, after sintering producing products after mild machining operations. Therefore, compaction represents one of the most important stages in the production of engineering components using the P/M route. However, the physical properties such as density and the stress distribution in the green compacts are determined not only by the properties of the constituents of the powder or the powder blend, but, also by the pressing modes and schedules. Thus, the present investigation pertains to generate experimental data on the compaction behaviour of Fe-1.05% graphitesystems with two different iron particle size ranges and two different powder masses in order to highlight the various aspects of compaction and also testing out the already existing compaction equations and search for the new ones. Powder blends of two different iron powder particle size ranges, namely, -106+53µm and -150+106µm respectively were blended with the required amount of graphite powder of 3 – 5 µm sizes for a period of 32 hours. Compaction studies have been carried out for two different amounts of both powder blends. The two amounts taken were 65g and 85g respectively. However, the main attempt was made to record the load and the corresponding heights and the top punch displacements for every two tons (0.02MN) of load which was applied in the steps of 0.02MN. Various equations for compaction were attempted empirically and the already existing ones were also tested. Critical analysis of the experimental data and the calculated parameters have resulted into several compaction equations which were arrived at empirically. The regression coefficient ‘R2’ in each case where compactions equations were empirically obtained was in very much close proximity to unity. However, it has been also confirmed that the data of the present investigation were well taken up by the earlier compactions equations, thus, validating them comprehensively
Authors and Affiliations
Miss Hemlata Nayak , C. M. Agrawal , Appu Kuttan , K. S. Pandey
Keywords
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