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Extra resources for Castings
Sample text
B. Raw material costs are significantly less than those used for other rapid cold setting or heat cured sands. c. In comparison with many other processes a quicker turnround of moulding and coremaking equipment is often possible. d . The gas evolution on casting is low and the fumes produced are not objectionable. There are few disadvantages to the process and those that exist depend very much on the individual foundry requirements. a. Although a great deal of research work has been carried out in recent years there still exists some problem with core breakdown properties.
Fig. 3. Naturally occurring sand, demonstrating sub-angular to rounded shapes ( x 16). 36 PHYSICAL PROPERTIES The physical properties of high silica foundry sands can be considered to be of greater importance than their chemical composition. The shape, size, screen distribution and surface characteristics of the sand grains are the fundamental properties that determine whether a sand is suitable for the production of castings. , :. J ,, OBSERVATION WINDOW ----+---_,(m the finer the sand the more prone it is to thermal expansion defects.
Table 1 illustrates how the Hydrosizer can improve the grading of a sand for foundry use. The production of a consistent foundry sand really begins in the quarry. It is essential to select the correct material in the first instance as subsequent processing is greatly facilitated. The foundryman is more concerned with a consistent quality of sand than obtaining the best possible material for the process employed. The key to quality coating production depends significantly on the control of foundry raw materials and so the importance of consistency in sand quality can be appreciated.