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A Cylindrical Profile Measurement Model for Large-Scale High-Speed ​​Rotary Equipment

A technology for measuring models and cylinders, applied in measuring devices, complex mathematical operations, instruments, etc., can solve problems such as offset errors affecting the sensor probe, influence, and the axis of the sensor ball support rod cannot be guaranteed, so as to improve ultra-precision measurement. Accuracy, the effect of avoiding principle flaws

Active Publication Date: 2021-03-30
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, most of the current research focuses on the measurement of the two-dimensional circular profile. The circular profile measurement model is very mature, and the research on the three-dimensional cylindrical profile measurement model is still relatively weak. The profile of the measured section will be elliptical; the tilt of the vertical guide rail will not only directly affect the profile measurement, but also affect the offset error of the sensor probe; in addition, some new error sources have not been studied, such as the axis of the horizontal guide rail cannot Ensure that it is completely parallel to the horizontal datum, and the axis of the sensor ball support rod cannot be guaranteed to be completely parallel to the vertical datum. Accuracy Requirements for Precision Measurement of Cylindrical Profile

Method used

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  • A Cylindrical Profile Measurement Model for Large-Scale High-Speed ​​Rotary Equipment
  • A Cylindrical Profile Measurement Model for Large-Scale High-Speed ​​Rotary Equipment
  • A Cylindrical Profile Measurement Model for Large-Scale High-Speed ​​Rotary Equipment

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Embodiment 1

[0030] A cylindrical profile measurement model for large-scale high-speed rotary equipment based on multiple offset errors. The measurement model includes seven offset error components, which are the eccentric error (α, e), which is the difference between the center of the base surface of the test piece and the center of rotation of the turntable. Deviation, geometric axis tilt error γ, sensor head offset error d j (j=1,2,...,p, p is the number of sampling sections), the sensor ball radius r, the sensor head rod tilt error The tilt error w of the axis of the horizontal guide rail and the tilt error φ of the axis of the vertical guide rail, the measurement model at different height sections of the cylindrical profile is:

[0031]

[0032] In the formula, ρ ij —The jth section i on the cylindrical profile of the tested piece, i=1, 2,...,n, n is the number of sampling points of each section, from the measuring point to the instantaneous measurement center O 3j distance; Δr ...

Embodiment 2

[0046] Such as figure 1 , figure 2 Shown is the seven-offset error cylinder profile measurement model proposed by the present invention, which improves the cylinder profile measurement model by introducing a new error source on the basis of the two-parameter cylinder profile measurement model. The geometric center of the base surface of the tested piece O 21 Impossible and turntable center of rotation O 11 The overall eccentricity error (α, e) is introduced due to complete coincidence; when there is an angle γ between the geometric axis of the test piece and the rotary axis of the turntable, it will not only bring about the secondary eccentricity of the sections at different heights, but also make each section ellipse; the sensor The measuring line does not pass through the measuring center of gyration O 1j The probe offset error caused by d j It will also affect the measurement results, causing the sensor to measure not relative to the measurement center of rotation O 1...

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Abstract

The invention discloses a large-scale high-speed rotary equipment cylinder contour measurement model based on multi-offset errors. The measurement model comprises seven bias error components, respectively including an eccentric error (alpha, e), a geometrical axis tilt error gamma, a sensor measuring head offset error dj( j = 1, 2, ..., p, p is the number of sampling sections), a sensor measuringball radius r, a sensor measuring head strut inclination error horizontal guide rail axis inclination error w, and a vertical guide rail axis inclination error phi, and measurement models at differentheight sections of a cylindrical contour. Error sources can generate great influence in cylindrical contour measurement, so that an existing model cannot meet the current precision requirement for cylindrical contour precision measurement of large-scale high-speed rotary equipment.

Description

technical field [0001] The invention belongs to the technical field of surface shape measurement; in particular, it relates to a cylindrical profile measurement model for large-scale high-speed rotary equipment based on multiple offset errors. Background technique [0002] Cylindricity error is the core technical index reflecting the surface shape of rotary parts. With the development of precision engineering technology and aerospace technology, the accuracy requirements for the cylindricity error of rotary parts are getting higher and higher. For example, the cylindricity error of a certain type of aeroengine low-pressure turbine shaft is required to be within 5 μm; accuracy, but the absolute existence of each system error has a great impact on the measurement of the surface shape of rotary parts. Therefore, it is necessary to study the possible bias error sources in the measurement system of large-scale high-speed rotary equipment, and further improve the accuracy of rotar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/20G06F17/15
CPCG01B21/20G06F17/15
Inventor 孙传智刘永猛谭久彬王晓明王宏业
Owner HARBIN INST OF TECH
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