Green Sand Management - Role Application of Carbonaceous Additives and Concept of total Carbon in a Green Sand System

摘要

The advent of High Volume, High Density & High Pressure Molding Lines has changed the logistics of Molding Techniques and selection of additives significantly. Having 4 main ingredients, Sand, Bentonite, Water & Additives, the properties of the Sand Mold resulting from this simple mixture to deliver target casting quality is complexly variable. Modern machine molding parameters demand increasing efficiency from the additives, many of which are natural resource based; having limitations for developing their inherent properties under the speed, force and load conditions of modern foundry installations. This challenge to optimize a given natural resource escalates sand preparation and management from being an 'art' to being a 'science'. Consequently, the importance of maintaining range-bound values of the prepared Sand in addition to the promotion of a 'reducing' atmosphere in the metal-mold interface can minimize the occurrence of sand related defects.