Method for measuring sectional profile size of turbine blade

A technology of turbine blades and cross-section profile, applied in the field of aero-engine turbine blade measurement, can solve the problems affecting turbine blade measurement accuracy, compensation error, large compensation error, etc., and achieve the effects of high work efficiency, high measurement accuracy, and simple measurement process.

Active Publication Date: 2019-02-15
CHINA HANGFA SOUTH IND CO LTD
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Problems solved by technology

[0005] The invention provides a method for measuring the profile size of the cross-section of a turbine blade to solve the problem of the influence of the radius of the measuring probe when measuring the

Method used

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[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention may be implemented in a variety of different ways defined and covered below.

[0028] image 3 It is a schematic diagram of the measurement of the cross-sectional profile size of the turbine blade in the preferred embodiment of the present invention; Figure 4 It is a two-dimensional schematic diagram of theoretical leaf profile compensation in a preferred embodiment of the present invention; Figure 5 It is a schematic diagram of the theoretical blade shape compensation rolling ball (surface rounding operation) of the preferred embodiment of the present invention; Image 6 It is a three-dimensional schematic diagram of measuring radius compensation in a preferred embodiment of the present invention; Figure 7 It is a two-dimensional schematic diagram of measuring radius compensation in a preferred embodiment of the present invention.

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Abstract

The invention discloses a method for measuring the sectional profile size of a turbine blade. The sectional profile size of a turbine blade is reversely deduced through radius compensation of the spherical head of a three-coordinate measuring instrument. The method includes the following steps: constructing a theoretical blade profile curve of a standard turbine blade at a predetermined profile height by using three-dimensional modeling; constructing a theoretical blade compensation profile curve after radius compensation of the theoretical blade profile curve; comparing and evaluating the theoretical blade profile curve and the theoretical blade compensation profile curve to obtain a theoretical error value; obtaining a measured blade profile curve of a turbine blade to be measured at thepredetermined profile height through three-coordinate measurement; and reversely deducing the actual sectional profile size of the turbine blade through the theoretical error value and radius compensation. The whole measurement process is simple, and the work efficiency and the measurement efficiency are high. The method is suitable for measuring the profile size of various types of precision casting turbine blades.

Description

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Claims

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Application Information

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Owner CHINA HANGFA SOUTH IND CO LTD
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