FIELD: foundry. SUBSTANCE: two walls of molding box with special surface are made of magnetizing material and located square to two walls made of nonmagnetizing material. Located at special surface of walls made of magnetizing material are permanent and replaceable sides. Sides are right triangle in cross-section. One leg of cross-section is installed in special surface, while the other, in wall made of magnetizing material. Side axis is straight or curved and side cross-section is variable or constant along axis length. Angle of side section facing inside the molding box equals 10-45 deg to special surface. Sides are made from material with high magnetic permeability. Side top facing inside molding box is positioned for location of surface of mold hollow near this top. EFFECT: excluded defected and reduced labor input. 4 cl, 2 dwg
