The overflow, also air bean mentioned, has the task in the pressure pouring to derive liquid metal, which contains air, parting agent steams or by turbulences oxides developed, from the form cavity.
The over runs are reaming in the moulding form near the form cavity, which are connected with the form cavity by a thin ingate. These are provided with vent holes, air and parting agent steams outward to take off are.
Over runs who that as in such a way as possible placed that oxides and remnants of the lubricant are washed, also they should provide for heating certain form ranges.
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|Overflow (pressure pouring)|