Zlochevska N. Providing mechanical properties of homogeneous and structural heterogeneous materials in plastic forming of parts

The actual scientific and technical problem of the increasing of mechanical properties of homogeneous and structural heterogeneous materials in plastic forming of parts. Theoretical and numerical calculations of helical expanding forging process have been carried out. The relationship of process parameters with the shape of die channel have been found out. The theoretical dependence of distribution of maximum level of accumulated strain intensity in the cross-section of workpiece after the helical expanding forging process which depends of geometrical die parameters. Comparison of theoretical and numerical results has shown that the error doesn't expands 15-19% after isothermal helical expanding forging process. Experimentally shown that after isothermal helical expanding forging process the limit of durability increases at 18-20% for AK7, 19-24% for alloy 1420, for alloy Zr-1%Nb at 15-17% and for eutectic-reinforced structural heterogeneous material Ті-ТіВn increases at 16-17%. Experimentally was shown the effectiveness of usage of two-state forging of eutectic-reinforced alloy: at first state provides prior breaking up of reinforced phase by the deformation in condition of large shear strain at the second state - forging of blade in conditions near of isothermal/ It was shown that the process realization provides the increasing mechanical conditions relatively to cast structure at 10-16% in lock zone of blade, and at 12-17% in blade body. Results of dissertation have been implemented at industrial enterprises. Key words: helical expanding forging process, mathematical model, mechanical properties, strain intense, blade workpiece.