Question

Which of the following formulas is used for the calculation of shape factor for complex casting in risering system?

(a) (l – w)/h

(b) (l^2 + w)/h

(c) (l^2– w)/h

(d) (l + w)/h

I got this question by my school principal while I was bunking the class.

I'd like to ask this question from Riser Placement topic in portion Cooling and Solidification of Casting-Forming-Welding I

Answer 1

The correct answer is:

(b) (l2+w)/h(l2+w)/h

Explanation: In the context of riser placement and solidification in casting, the shape factor is a term used to relate the geometry of the casting to its ability to retain heat during solidification. This factor is important for determining the optimal size and placement of the risers, which act as reservoirs to supply molten metal during the solidification process, compensating for shrinkage.

The formula for the shape factor for a complex casting is generally derived based on the dimensions of the casting. Here:

• ll = length of the casting,
• ww = width of the casting,
• hh = height (thickness) of the casting.

The shape factor formula l2+whhl2+w​ accounts for the shape of the casting and helps predict how efficiently it will solidify, taking into account both the dimensions and the material's thermal characteristics.

Thus, the correct formula is (b).