SEALING CAP FOR HOLE JUNCTIONS IN VACUUM FILM CASTING MOULD FOR PRODUCTION OF ALUMINIUM AND OTHER ALLOY CASTINGS Russian patent published in 2017 - IPC B22C9/03 

FIELD: metallurgy.

SUBSTANCE: invention refers to casting production and can be applied in production of castings out of aluminium and other alloys. Sealing cap is made in the form of hollow case with flat end part interconnected with conical side wall with maximum outer diameter of 48-50 mm corresponding to the maximum diameter of a vent hole. Outer diameter of cap end collar is 1.40-1.70 of the maximum outer diameter of the side wall, and side wall thickness is 1.3-1.9 mm. The cap is made out of highly elastic thermoplastic elastomer. Thermoplastic elastomer shows Shore hardness A 65-75 units, minimum tensile strength of 4.5 MPa, minimum elongation to rupture of 300 %, density of 1.20-1.24 g/cm³ and melt flow index (190°C/2.16 kg) of 0.5-3.0 g/10 min.

EFFECT: reduced labour intensity and time of preparation operations of sand casting mould making, and improved quality of casting.

5 cl, 1 dwg, 14 ex