In gating system design, the fist step is to calculate the optimal pouring time as:
t=K(1.41+T/14.59)√W
where,
K: fluidity factor
T: average section thickness (mm)
W: mass of casting with gating system (kg)
However, we are designing the gating system, so we have not known the weight of the gating system yet.
So, How to estimate mass of casting with gating system?
You are very correct Mr. Hanh. While doing the methoding of a casting depending on the alloy we are going to cast assume a yield as per the industry norms and estimate the weight of the gating system. After actual casting ,separate the gating system with the risers and measure the weight. The difference will be minimal.
A.V.Sethuraman
There is no correlation between casting weight and gating system at very beginning. First, you have to define either volume or weight of your casting part to reveal the gating system details, i.e. areas of this rigging system. Maybe, then you can make an approach that the weight of gating and risers is likely 20-30% of your casting part weight. In all cases, firstly, you have to define what you cast with respect to weight. Practically, we first determine weight then calculate the gating system. By the way, this formula is for ferrous casting, same issue but different formulae for non-ferrous. Good luck.
Gating design mainly depened on however your gating system is presurusized or non pressurised system. If your system is pressurised one this mean that the chock area will be area Ingate .
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