Pouring system for large thin-wall casting with length of more than 650 mm

Abstract

The invention relates to a pouring system for a large thin-wall casting with the length of more than 650mm. The pouring system for the large thin-wall casting with the length of more than 650mm comprises a pouring cup, a main pouring gate, transverse pouring gates, wedge-shaped risers, a part wax mold and exhaust and auxiliary supports; the main pouring gate is vertically and fixedly connected to the bottom end of the pouring cup, the transverse pouring gates are horizontally and fixedly connected to the side part of the main pouring gate, the plurality of transverse pouring gates are arranged, and the plurality of transverse pouring gates are evenly distributed in the length direction of the main pouring gate; the part wax mold is located on the outer sides of the transverse pouring gates, the part wax mold and the main pouring gate are arranged in parallel, and the part wax mold and the transverse pouring gates are fixedly connected through the wedge-shaped risers; the pouring cup and the transverse pouring gates are fixedly connected through the plurality of exhaust and auxiliary supports; a plurality of rectangular inner risers are arranged on the back surface of the part wax mold and are distributed in three rows in the length direction of the part wax mold, the rectangular inner risers in the middle row directly face main ribs on the front surface of the part wax mold, and the rectangular inner risers in the left and right rows are symmetrically distributed on two sides of the rectangular inner risers in the middle row and are adjacent to the edge of the part wax mold; and a rectangular inner riser in the middle row of the back surface of the part wax mold is right against a convex lug on the front surface of the part wax mold.

Description

technical field [0001] The invention belongs to the technical field of manufacturing aero-engine parts, in particular to a pouring system for large thin-walled castings with a length of more than 650 mm. Background technique [0002] The expansion sealing sheet of an aero-engine tail nozzle has a casting length of 650mm, a width of 126mm, a minimum wall thickness of only 1mm, and the minimum wall thickness area accounts for 72% of the casting floor area, which is a typical flat large thin-walled part. It has the structural characteristics of large plane and multiple ribs, and has unevenly distributed mounting seats, bosses, ribs and other structures, and the thickness transition of castings is uneven, and there are many hot joints, which are prone to loose defects. Ni 3 Al-based intermetallic compounds, compared with traditional casting superalloys, have poor fluidity. Due to the long length of castings, the pouring and filling time in the casting process is increased, whic...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the present invention provides a pouring system for large thin-walled castings with a length of more than 650 mm, which has been successfully applied to the production of expansion sealing sheet castings with a length of more than 650 mm at the tail nozzle of an aero-engine, effectively reducing the looseness of the castings, Metallurgical defects such as under-injection and thermal cracks have greatly increased the pass rate of casting products by 30%, significantly reduced the consumption of master alloys, effectively shortened the delivery cycle of a single engine, and greatly reduced the defects caused by defects in the casting production process. The resulting useless man-hours significantly reduce production costs and further improve production efficiency

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