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Which of the following formulas is used for the determination of solid friction (fs) between the mould and casting during solidification?(a) fs = ηs-H(b) fs = ηs/H(c) fs = ηs+H(d) fs = ηs*HI had been asked this question at a job interview.My query is from Solidification with Predominant Resistance in Mould in chapter Cooling and Solidification of Casting-Forming-Welding I

Answer»

Correct choice is (d) fs = ηs*H

For explanation: When the relative MOVEMENT occurs between the casting and the solidified mould slag, then the friction force is generated by the solid-solid contact. The RESULTING solid friction (fs) is EXPRESSED as fs = ηs*H, where ηs is the COEFFICIENT of solid friction, and H is the Ferro-static PRESSURE of molten metal.



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