When making gating system for a die casting mold, it is better to list all the possible solutions and then compare with each other first.
After that, you will find a best gating system for the tooling. Here are several examples of die casting toolings.
Solution 1
Solution 2
Solution 3
The main difficulty of this part is to solve the filling on both Surface A and Surface B, and to avoid potential trapped air.
In the solution 3, a small inclined surface was specially added for the purpose of good filling, which successfully solved this problem.
The other solutions, even the inclined surface was added, it is not able to solve this problem.
Therefore, the solution 3 should be best one among all these solutions.