Casting seeding section forming die capable of accurately controlling oriented growth of single crystal blade crystals

Abstract

The invention relates to the technical field of precision casting of aero-engine blades, particularly relates to a casting seeding section forming die capable of accurately controlling crystal orientation growth of a single crystal blade. The forming die comprises an upper die and a lower die, wherein the buckling surface of the upper die and the lower die is provided with a corresponding wax injection port, a runner and a seeding section forming cavity, one end of the seeding section forming cavity is communicated with the runner, the other end of the seeding section forming cavity is communicated with a placing groove for accommodating seed crystals, the outer end of the placing groove is provided with a spiral push rod capable of controlling the seed crystals to extend into the seedingsection forming cavity, and the lower die is also provided with a gauge parallel to the placing groove. According to the invention, the seeding section is manufactured by the die; the extending depthof the seed crystal can be accurately adjusted; the crystal oriented growth of the single crystal blade can be accurately controlled in casting; the method greatly reduces the probability of mixed crystals in the single crystal seeding process, effectively solves the problem of the mixed crystals in the initial growth stage of the seed crystals, improves the blade crystal orientation qualificationrate, enables the crystal orientation of the prepared single crystal blade to be consistent with the original seed crystal orientation, and realizes the seed crystal engineering application.

Description

technical field [0001] The invention relates to the technical field of precision casting of aero-engine blades, in particular to a casting seed segment forming mold capable of precisely controlling the crystal orientation growth of single-crystal blades. Background technique [0002] The preparation methods of single crystal blades mainly include crystal selection method and seed crystal method, while the traditional crystal selection method can only prepare single crystal blades with orientation and cannot guarantee that the growth direction of the blade is completely consistent with the direction of the stacking line, and there is a certain angle deviation , to a certain extent, the crystal orientation of single crystal blades prepared by crystal selection method is random, and the deviation of crystal orientation will seriously affect the high temperature mechanical properties of single crystal blades, which restricts the performance of aero-engines to a certain extent. T...

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Problems solved by technology

[0002] The preparation methods of single crystal blades mainly include crystal selection method and seed crystal method, while the traditional crystal selection method can only prepare single crystal blades with orientation and cannot guarantee that the growth direction of the blade is completely consistent with the direction of the stacking line, and there is a certain angle deviation , to a certain extent, the crystal orientation of single crystal blades prepared by crystal selection method is random, and the deviation of crystal orientation will seriously affect the high temperature mechanical properties of single crystal blades, which restricts the performance of aero-engines to a certain extent

The preparation of single crystal blades by the seed crystal method can realize precise control of crystal orientation in any direction, reduce the scrap rate of single crystal blades, and improve the performance of single crystal blades; but the disadvantage is that the process is difficult and there is no engineering application for the time being

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