FIELD: metallurgy. SUBSTANCE: metal mould has movable half mould 1 and stationary half mould 2 and inserts 3, 4, that have correspondingly forming inner cavities teeth 5 and 6 conjugated by flat surfaces 7 and 8. In the case teeth 5 are made in the form of trapezium with smaller side in peak 9, slant side of which has bulge 10, and conjugation of inserts surfaces is made using the bulge. Teeth 5 are made in the form of equal-sided trapezium with bulges 10, 11 on both slant sides and mating inserts 4 have teeth 6 with flat sides contacting surface 7 of bulges 10 and 11. Besides, top of trapezium-shaped tooth has groove 14. EFFECT: improved mould design. 2 cl, 8 dwg
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