NEED ASSISTANCE WITH VENT RUNNERS?
Midland Technologies will offer a suggested vent block runner layout when Midland Ultimate Vent Blocks are purchased and a 3D layout of the tool is provided.
CONSIDERATIONS FOR RUNNERS
Midland Blocks allow for more efficient venting than conventional vents. Not only is more air evacuated and risk of flash reduced, but the vent runners that tie the block to the die cavity insert also do not oxidize during remelt as severely as conventional vents. This allows the caster to reclaim more casting alloy contributing to overall job profitability while at the same time reducing porosity through improved venting.
Correctly designing vent runners from the cavity to the vent block is critical to proper venting. Vent runners should be designed to control velocity of the exiting metal while providing sufficient area for air and gas evacuation. This is achieved by designing a vent runner system which creates a pressure drop and provides sufficient resistance to slow the metal. Proper ejection of the runners must also be taken into consideration.