红圈位置的空挡在铸造造型时，是填充的砂子，模具需要有拔模斜度，拔模斜度

The neutral position when the red circle shape casting, sand is filled, the mold needs to have a draft angle, the draft angle is generally a positive amount plus +, this image is a mold parting surface, neutral minimum size 6.28mm. Pouring when filling this position sand is an island columnar pattern surrounded entirely surrounded by liquid aluminum, this location is in a superheated state, the strength of sand will heat decreases, now used is a low pressure casting process, the gravity (Europe gravity casting process, gravity casting sand will not stick) the filling pressure is larger, the aluminum is immersed in the liquid in the gap between the sand, eventually leading to sticky sand, i.e. a mixture of sand and liquid aluminum. Like concrete, like, due to the particularly high hardness of sand, machining mode can not be removed, the position of this space is small, tool Xiabu Qu. <br>You modify the position I personally think of little significance, but to increase the difficulty of casting.

The blank position of the red ring in the casting shape, is filled with sand, the mold needs to draft slope, draft slope is usually plus positive, this picture is the mold pattern face, the minimum size of the blank is 6.28mm. The sand in this position is an island column pattern, surrounded by aluminum liquid, this position is in the overheating state, the mould strength will be reduced by heat, now using a low-pressure pouring process, than gravity (Europe is gravity pouring process, gravity pouring will not stick to sand) the filling pressure is larger, the gap between the sand particles immersed in aluminum liquid , which eventually results in a mixture of viscous sand, i.e. aluminum and sand. Like concrete, because the hardness of the sand is particularly high, the machine way is impossible to remove, this position space is small, the tool can not go down.<br> The location of your modification i personally don't think it makes much sense, but it adds to the difficulty of casting.

The blank at the red circle position is filled with sand when casting. The mold needs draft angle, which is usually plus plus plus positive. This picture is the mold parting surface, and the minimum size of the blank is 6.28mm. When pouring, the sand at this position is an island columnar pattern, surrounded by aluminum liquid. This position is in an overheated state, and the strength of the sand mold will be reduced by heat. Now, the low-pressure pouring process is used, which is higher than the filling pressure of gravity (Europe is gravity pouring process, gravity pouring will not stick to sand). The gap between the sand particles is immersed in aluminum liquid, which eventually causes sticking Sand is a mixture of liquid aluminum and sand. Like concrete, due to the high hardness of the sand, the machining method can not be removed, and the space of this position is narrow, so the tools can not be removed.<br>I don't think it's meaningful for you to change your position, but it makes casting more difficult.