A method for splitting the deep hole in the slender inner cavity of an aero-engine

Abstract

The invention belongs to the technical field of aircraft engine repairing, and relates to a long and thin inner cavity deep hole splitting method for an aircraft engine. The method comprises the steps that firstly, the axial distance a between a tensioning pipe and the opening end of the air inlet side of an engine low-pressure rotor is measured to serve as the reference size for cutting off the tensioning pipe; the feeding amount is measured through a splitting device, and the splitting depth is calculated; the tool end of the splitting device enters from the engine air inlet side, the feeding amount b of the splitting device is measured, and when the difference between a and b is smaller than or equal to 0.1 mm, contact between a guiding core shaft end of the splitting device and the end face of the tensioning pipe is determined; then, high-temperature alloy deep hole cutting is carried out, the tensioning pipe starts to be split from a boss through the splitting device, and when the outer diameter of the tensioning pipe is equal to the outer diameter of a tool of the splitting device through cutting, in other words, the axial depth is the sum of a and 36 mm, the tensioning pipe is cut off; and a low-pressure unit body and the vortex rotor are split into two main assemblies from the front end and the rear end of a main machine. According to the long and thin inner cavity deep hole splitting method, the repairing cycle is shortened to the maximum degree, the cost is greatly saved, and meanwhile the function of assisting decomposition of the engine is achieved.

Description

technical field [0001] The invention belongs to the technical field of aero-engine repair, in particular to a method for splitting deep holes in an elongated inner cavity of an aero-engine. Background technique [0002] An aero-engine manufacturing technology originates from Russia. During manufacture, due to structural and cost constraints, the threaded part of the contact between the tension tube and the low-pressure rotor does not adopt anti-adhesion design, and is subject to large thermal stress and alternating stress during work. As a result, it is very easy to cause adhesion of metal parts with the connected low vortex shaft inner nut, forming a "dead weld", that is, the thread at the connection between the low pressure unit body and the low vortex rotor cannot be unscrewed, resulting in the failure of the engine to disassemble normally. Because there is no slender inner cavity in China (length and diameter are: 600, / Ф70. See figure 1 ) deep hole splitting method and...

AI Technical Summary

Problems solved by technology

When a problem occurs, the whole machine is often destructively disassembled or sent abroad for professional repair, resulting in a substantial increase in repair costs and an infinite extension of the engine delivery cycle

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