Shell manufacturing process for large directional blade mold shell

Abstract

The invention discloses a shell manufacturing process for a large directional blade mold shell. The shell manufacturing process comprises a step of preparing a mold shell by wrapping a wax mold with amold shell material to form the mold shell with a 15-layer structure, wherein each layer of the first three layers is subjected to windless drying for 7-16 hours, the relative humidity of an environment is adjusted to 50%-70% to ensure slow drying of the first three layers, and the slurry and the sand of each layer of the first three layers are pure zircon powder slurry and fused corundum sand, respectively; the fourth layer to the fourteenth layer are dried by strong wind for more than 8 hours, the relative humidity of the environment is adjusted to 35%-45%, and each layer of the fourth layer to the fourteenth layer is made of zircon powder-electric smelting mullite powder mixed slurry; the fifteenth layer adopts is dried with strong wind for more than 24 hours, the relative humidity ofthe environment is adjusted to 35%-45%, and the fifteenth layer adopts zircon powder-electric smelting mullite powder mixed slurry. The process is ingenious in design, and the yield of products is increased.

Description

technical field [0001] The invention relates to the technical field of precision machining, in particular to a large-scale directional blade mold shell manufacturing process. Background technique [0002] With the rapid development of my country's heavy-duty gas turbine industry, the high-temperature mechanical properties of its key components are increasingly demanding, and the precision casting process of high-temperature alloy hot-end components and complex structural parts has become one of the technical bottlenecks that urgently need to be broken through. As a key part of the precision casting process, the shell-making process has a vital impact on the dimensional accuracy, metallurgical quality and pass rate of the product. [0003] Compared with the aeroengine directional blade formwork, the large-size directional blade formwork bears heavier alloy hydrostatic pressure and impact force, and compared with the large equiaxed crystal casting formwork, it withstands longe...

AI Technical Summary

Problems solved by technology

[0004] For large-sized directional formworks with a length greater than 300mm, a width greater than 120mm, and a thickness greater than 80mm, it is difficult to take into account the appropriate strength and yield of the formwork according to the traditional shellmaking process, and the castings are prone to "surface sticking sand" and "running". "fire" and other defects, the pass rate of precision castings is less than 20%