Large-aspect-ratio hollow-thin-wall thin and long shaft precision detection equipment and detection method thereof

Abstract

The invention belongs to the large-aspect-ratio deep hole inner type cavity and external diameter form and location tolerance precision detection equipment filed and relates to large-aspect-ratio hollow-thin-wall thin and long shaft precision detection equipment and a detection method thereof. The detection equipment comprises a pedestal, a measuring bar, an inner measuring head and a movement mechanism, an outer measuring head and the movement mechanism, a workpiece-support mobile platform, a calibration ring, a measured workpiece and a control processing unit. The workpiece-support mobile platform can drive the measured workpiece to move along an X direction. The inner measuring head and the isntalled movement mechanism, and the outer measuring head movement mechanism move along a Z direction. The calibration ring is used for establishing connection between the inner and outer measuring head. The control processing unit is used for compiling and measuring the program, collecting measured data and carrying out data processing so as to acquire a demanded workpiece form and location tolerance. By using the large-aspect-ratio hollow-thin-wall thin and long shaft precision detection equipment and the detection method thereof, measurement accuracy is high, a measurement length is long, measuring efficiency is high and usage is convenient.

Description

technical field [0001] The invention belongs to the field of precision detection equipment for shape and position tolerances of inner cavity and outer diameter of a deep hole with a large aspect ratio, and relates to a precision detection equipment and a detection method for a hollow thin-walled slender shaft with a large aspect ratio. Background technique [0002] The flexible and slender shaft represented by the aero-engine power turbine transmission shaft has the characteristics of large aspect ratio (greater than 30), thin wall thickness, and high requirements for high-speed dynamic balance. The rotor is composed of blisk blades, etc., and is supported on the bearing for high-speed rotation. It is the core part of the turboshaft aero-engine. [0003] Flexible slender shafts are generally thin-walled hollow shafts, and the surface of the inner cavity is designed as a through hole or a stepped hole, with internal splines and threads, etc., the minimum diameter is less than...

AI Technical Summary

Problems solved by technology

[0005] (1) Due to the long extension rod connected to the single-coordinate probe sensor, the load of the probe is large, which causes the probe to be unbalanced, and the measurement accuracy and repeatability drop sharply. The longest extension rod of the coordinate measuring machine can reach 300mm, which cannot be detected deeper lumen

[0006] (2) The wall thickness difference of the three-coordinate measurement is indirectly calculated through the center and the inner and outer diameters, and there are errors

[0010] (3) Use one probe to measure the inner diameter and outer circle respectively, which seriously affects the measurement efficiency

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