Precise butt-joint machining method for ultra-long diameter ratio turbine shaft with blind holes

Abstract

The invention discloses a precise butt-joint machining method for an ultra-long diameter ratio turbine shaft with blind holes. The method is characterized in that the ultra-long diameter ratio turbineshaft is provided with the small-bore inner hole blind hole in one end of the shaft and the large-bore inner hole blind hole in the center of the shaft, the whole turbine shaft is divided into a longshaft body and a short shaft body, the long shaft body and the short shaft body are machined, and then welded through electron beams in a connection vertical plane, the welding surface of the long shaft body and the short shaft body is the cross section of a large-bore inner hole portion in the center of the shaft; one end of the short shaft body is a small-bore inner hole, the other end, namelythe large end, of the short shaft body is a machined large-bore inner hole, one end of the long shaft body is a machined large-bore inner hole, and the other end of the long shaft body is the machinedblind hole; the outer circle sizes of the short shaft body and the long shaft body need to be kept consistent before welding; the size of the inner hole in the large end of the short shaft body is finely machined in place, and it is guaranteed that the coaxiality of an inner circle and an outer circle is less than or equal to 0.01 mm; the long shaft body and the short shaft body are arranged in awelding tool for assembly; and when the welding electron beams conduct welding, the two shaft bodies are welded and assembled in an interference mode, and it is guaranteed that the coaxiality is smaller than or equal to 0.02 mm.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a precise butt joint processing method for turbine shafts in aero-engines. Background technique [0002] The turbo shaft is an important part of the engine, especially an important part of the aero engine. Its role is to support the transmission parts and transmit torque, so that the compressor and other accessories can work at the same time. Due to the large power load in the aero-engine, the size of the turbine shaft itself is relatively large. Considering the requirements for weight reduction, cooling and dynamic balance, the structure of the turbine shaft is relatively complicated, with blind holes and even some shafts with more holes. The distance from the central turbine shaft puts forward some special requirements for the machining of the turbine shaft. [0003] The shaft length of the blind hole drilled at both ends is long. When processing the inner holes at both ends, ...

AI Technical Summary

Problems solved by technology

[0009] However, it cannot solve the equipment and manufacture of the super-long-to-diameter ratio turbine shaft with a blind hole with a small-diameter inner hole at the shaft end and a large-diameter inner hole in the center of the shaft.

Images