Method for making guide vane inner ring by opening process window

Abstract

The invention relates to the technical field of precision casting, in particular to a method for making a guide vane inner ring by opening a process window. The method comprises the following steps of: designing a computer model of the guide vane inner ring by a UG solid modeling method; firing with a laser rapid forming machine; performing combination, sticking and wax-welding on a fixture with a fixing tenon; performing size detection and local trimming on the wax piece to finish the manufacturing of a wax mould; assembling the wax mould into a pouring system; smearing a mixed coating consisting of silica sol and fused corundum on the surface of the wax mould; dewaxing and sintering to obtain a shell of the pouring system; pouring on a vacuum furnace to obtain an integral mother casting of the guide vane inner ring; opening 14 process windows in 15 mm*20 mm on the annular thin wall of the integral mother casting of the guide vane inner ring; welding 15 through holes of the outer ring and 35 nozzle holes of the inner ring on the integral mother casting of the inner ring; and welding a 15 mm*20 mm blocker on the process window to obtain the final product.

Description

technical field [0001] The invention relates to the technical field of precision casting, in particular to a method for preparing an inner ring of a guide vane by opening a process window. Background technique [0002] The inner ring of the guide vane of a certain type of engine is a cavity complex structure, the outline size is ф620×85, the main body wall thickness is 2mm, the outer ring has 15 through holes, and the inner ring has 35 nozzle holes, which is a thin-walled ring structure. Its traditional preparation method is welding forming method. However, the thrust-to-weight ratio of the guide vane inner ring prepared by the welding method is very low, and raw materials are wasted, and the processing cycle is also very long. [0003] Using the integral precision casting method to prepare the guide vane inner ring with such a complex structure can not only shorten the processing cycle and save raw materials, but also greatly increase the thrust-to-weight ratio of the guid...

AI Technical Summary

Problems solved by technology

However, since this piece is a ring-shaped thin-walled complex cavity structure, the thickness of the thin-walled surface of the casting is 2 mm, and the inner cavity is a hollow structure. There are 35 hollow columns with an inner diameter of 8 mm on the side of the inner ring, and 15 on the outer surface. A hollow boss, the coating process is difficult, prone to defects such as surface bulging, shedding, bulging, dryness, etc., and the surface of the overall precision casting is prone to metallurgical defects such as porosity, cracks, cold shut, and insufficient pouring.

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