Production of semifinished items with set sizes and density on rolling powders

Autor: O. A. Katrus
Rok vydání: 1997
Předmět:
Zdroj: Powder Metallurgy and Metal Ceramics. 36:164-169
ISSN: 1573-9066
1068-1302
Popis: A classification is presented for schemes for rolling powders in terms of the homogeneity condition for strain in the feed zone. The minimal deformation occurs on supply to one of the rolls, when the thickness of the powder flow is less than the feed area. As the feed is to two rolls and is accompanied by maximum strain on account of the aggregate-block mechanism, the macrodefects that are formed in the feed zone are inherited by the product. The operations are detailed in selecting the rolling parameters D, B, and \gaf to provide stable formation of a porous product with given thickness and density, which are affected by the grain-size composition and poured density. A stable grading is provided if the roll roughness is constant, as are the geometrical conditions of the process, which is operated in the optimal speed range. The density homogeneity of the product is improved as the connectedness of the powder decreases and as the ratio hp/dp increases.
Databáze: OpenAIRE
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