Replaceable in serts–One possible solution may be the use of replaceable inserts that can be put in the sprue well area.

The inserts can be designed either in a circle or square shape. The circular design has an obvious advantage as its shape can be more easily machined in the mold. The insert also may be shaped on both sides so it can be flipped if needed.

The insert is bolted from the back of the mold, and precautions must be taken to insure that molten metal will not enter the thread holes from the inside of the mold. In addition, the insert material must be the same as the base mold with equal coefficient of thermal expansion. When choosing the insert’s method of production, as-cast surfaces should he given preference over machining.

There are some disadvantages to the insert solution. Flash occurring at the contact area and between the mold and the insert may make the ejection of the casting from the mold difficult. This area also may be prone to the same form of deterioration. With this in mind, replaceable inserts must be considered only as a temporary measure that prolongs the life of the mold.

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