A cylindricity evaluation approach with multi-systematic error for large rotating components

Abstract

For reduction of the cylindricity evaluation uncertainty for large rotating components with large radius and height, the cylindrical profile measurement model is designed with multisystematic error considering eccentricity, probe offset, probe radius, geometric axis tilt, support rod tilt, and guide rail tilt. In addition, an error separation method is proposed based on the multi-systematic error measurement model. The combined influence of multisystematic error on the measurement results is analyzed, and cylindricity results are evaluated based on the proposed method. It is verified that, compared with other measurement models, the cylindrical profile measurement model with six systematic errors is the most accurate and stable in the standard cylindrical component measurements using a large high-precision cylindricity measuring instrument. In this experiment, compared with the cylindrical profile measurement model with two systematic errors, the cylindricity evaluation uncertainty obtained by the proposed method reduces from 55.2 µm to 21.0 µm with increasing radius and height of the standard cylindrical component. The proposed method is especially suitable for the cylindrical component measurements with large radius and height. The paper provides an accurate measurement model for high-precision error separation, tolerance allocation and cylindricity comparison for accredited laboratories, national metrology institutes etc.

The Effect of Deflections and Elastic Deformations on Geometrical Deviation and Shape Profile Measurements of Large Crankshafts with Uncontrolled Supports

“…Specific procedures for measuring large machinery components have been discussed in several studies [ 2 , 3 , 4 ]. They include methods to measure geometrical deviations of cylindrical surfaces of such components and include a concrete, broadly understood analysis of systematic and random errors in the proposed methods [ 5 , 6 , 7 , 8 ]. These studies contain valuable information for understanding the discussed issues and for perfectly matching modern metrology trends [ 9 ].…”

An Iterative Minimum Zone Algorithm for assessing cylindricity deviation

“…Varatharajulu et al [37] developed the empirical model and optimised it through Desirability Function Approach for drilling magnesium AZ31. Sun et al [38] proposed an error separation method based on the multi-systematic error measurement model to reduce the cylindricity evaluation uncertainty for large rotating components with effective radii. Aamir et al [39] investigated the effect of the multi-spindle drilling process on dimensional hole tolerances.…”

Decoupling method for four-degree-of-freedom automatic centering and tilting worktable

“…The eccentricity angle, eccentricity amount, rotation angle and rotation axis coordinates of the marker section before and after rotation can be directly measured or calculated, then the rotation matrix P derived from equation ( 10) can be brought into equation (5) to obtain a set of equations about φ x , k, s.…”

“…Aero-engine assembly is the last part of the aero-engine manufacturing process, and its assembly quality will directly affect the performance, reliability, and life of the aero-engine [1][2][3][4][5], and the poor assembly may lead to serious vibration or even collision when the rotor rotates at high speed, which is related to the stable operation and safety of the aviation system [6][7][8][9]. The multi-stage rotors in aero-engines are cylindrical components of the rotary symmetry class, and there is a problem of gradual accumulation of machining errors of rotors at all levels during the assembly process [10][11][12], so the precision measurement of single-stage rotor circular contours is a prerequisite and basis for ensuring the rationality of the assembly process.…”