BLOCK MOLD FOR SHIP PROPELLERS BLADES CASTING FROM TITANIUM ALLOYS Russian patent published in 2016 - IPC B22D15/00 

FIELD: technological processes.

SUBSTANCE: invention relates to metallurgy, preferably, to large-sized ship propellers blades from titanium alloys casting into block mold. Block mold comprises working cavity 6, gating system with riser 3, heads 4, 5 and feeder 11. Block mold is made with vertical connector, passing along blade edges screw line, and horizontal connector 10. Outside mold closure belt 9 in form of collar is made along screw line, which width is less than wall thickness and is equal to 2-2.5 of blade edge casting radii, and height makes 0.3-0.4 of belt width. After closure belt in block mold connection point cavity is made filled with moulding mixture. Horizontal connector plane separates block mold into two parts, passes through blade axis and divides pitch angle between blade first and last radial sections in two. Block mold wall thickness in places of blade and hub implementation makes 0.6-0.8 and 0.4-0.5 of casting wall thickness, and in head system shaping points is 0.7-0.9 of feeder thickness.

EFFECT: invention allows to increase block mold service life, reduce its warpage and increase castings quality.

5 cl, 5 dwg