FIELD: foundry, in particular, production of gas turbine blades cooled by penetration cooling. SUBSTANCE: multiple core has main core and minicores connected with main core. Minicore is formed as frame with longitudinal partition wall, which is connected at both sides to longitudinal frame walls by connecting members, whose axes are offset one relative to the other. Device for fastening main core and minicores fixes them normally to profiled part of product. Fastening device may be made in the form of spline connection. EFFECT: increased efficiency and improved quality of products. 2 cl, 4 dwg
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