Blade in-situ contact type three-dimensional measurement device and method

Abstract

The invention belongs to the technical field of blade measurement and discloses a blade in-situ contact type three-dimensional measurement device and method. The blade in-situ contact type three-dimensional measurement device comprises a working table, an X-directional motion platform, a Y-directional motion platform, a measurement mechanism and a rotating platform, wherein the X-directional motion platform is arranged on the Y-directional motion platform, and the Y-directional motion platform is arranged on the working table to form a two-dimensional motion platform; the measurement mechanismis arranged on the X-directional motion platform and moves in X and Y directions along with the two-dimensional motion platform; blades are mounted on the rotating platform and driven by the rotatingplatform to rotate. The blade in-situ contact type three-dimensional measurement method comprises maintaining constant-force contact between the measurement mechanism and the blades, reading the linear displacement of the measurement mechanism in the X and Y directions and the rotating angle theta of the blades through a grating rule and a rotary encoder, and performing coordinate transformationand bulb radius compensation to acquire the surface contour coordinates of the blades. The blade in-situ contact type three-dimensional measurement device has the advantages of being convenient to move, simple in measurement process and low in cost and can achieve precise in-situ measurement of the blades.

Description

technical field [0001] The invention belongs to the technical field of blade measurement, and more particularly relates to a blade in-situ contact type three-dimensional measurement device and method. Background technique [0002] Blades are important components of aero-engines, gas turbines and steam turbines. The surface machining accuracy not only affects the performance of the machine, but also determines the service life of the parts. During the machining process of the blade, the cutting depth is controlled solely by the theoretical machining allowance, and the machining quality of the blade surface cannot be guaranteed. In order to obtain the real machining allowance of the blade blank, it is necessary to obtain the contour model of the blade blank first. The blade part is a free-form surface part, and the size data of the blade cannot be detected by conventional measuring tools. The measurement of the blade is a difficult point in the current processing. [0003] Th...

AI Technical Summary

Problems solved by technology

The conventional three-coordinate measuring instrument has high measurement accuracy and can meet the accuracy requirements, but the equipment has poor mobility and is greatly affected by dust. The instrument needs to program and plan the stylus trajectory in advance, and programming separately for different types of blade parts is time-consuming and labor-intensive, and the work efficiency is low

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