A method for measuring the size of the small step surface of the cantilever slender shaft

Abstract

A method for measuring the size of a small step surface of a cantilever slender shaft, which includes the following steps: step A, providing a positioning shaft, and inserting the positioning shaft into the long shaft of a power turbine, so that the inner circular step surface is closely connected to the step surface of the adjustment pad Fitting, step B, rotate the positioning shaft so that the measuring plate is located above the honeycomb end face of the guide, and use the depth ruler on the working surface of the measuring plate to measure the measuring plate to the honeycomb end face of the guide Then according to the formula: L1=L-L2, the dimension L1 from the installation step surface of the adjustment pad to the honeycomb end surface of the guider is obtained. The method for measuring the size of the small step surface of the cantilever slender shaft provided by the present invention converts the dimensional relationship of the cantilever beam structure, which is difficult to measure directly and accurately, into the dimensional relationship of the fixed characteristic surface by designing special tooling, thereby greatly improving the measurement accuracy and measure efficiency.

Description

technical field [0001] The invention relates to the technical field of aero-engine assembly, in particular to a method for measuring the size of a small step surface of a cantilever slender shaft during the assembly process of a turboprop engine Background technique [0002] figure 1 It is a schematic cross-sectional structure diagram of a turboprop engine assembly state, see figure 1 As shown, in the general assembly process of a certain turboprop engine, after the long shaft 100 of the power turbine is installed, it is necessary to measure the distance L1 between the adjusting pad installation step surface 101 on the long shaft (the radial dimension is only 2.72mm) and the honeycomb end face of the guider , to calculate the axial clearance between the honeycomb end face and the rotor blade crown of the object to check whether the clearance of the rotor and stator parts of the engine meets the design value, so as to ensure that there is no friction during the operation of ...

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Problems solved by technology

[0003] In the state where only the power turbine long shaft 100 is installed, the power turbine long shaft 100 is only figure 1 As shown, there is a support structure at a position far (300-500 mm) below the adjustment pad installation step surface 101, that is to say, the end of the long shaft 100 of the power turbine is in a cantilever state, and the radial swing is large. Due to the adjustment The size of the pad installation step surface 101 is small, so if the depth gauge is directly used to measure the L1 dimension from the adjustment pad installation step surface 101 to the honeycomb end surface of the guider, the side head of the depth gauge can only touch the edge of the step surface, and the data difference during the measurement process large, unstable data

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