Aviation blade tenon laser scanning measuring machine and measuring method

Abstract

The invention belongs to the technical field of laser detection and relates to an aviation blade tenon laser scanning measuring machine and a measuring method. The measuring machine is composed of a fixed bridge type measuring platform, a sensor part and a tenon tool clamp part. The measuring method comprises the following steps of firstly, calibrating three sensors, and installing to-be-measuredtenons to enable the tenons to be linearly arranged; adjusting and keeping the pose of the sensors unchanged, driving the to-be-measured tenons to move linearly by a linear motor, and completing linear laser single scanning; and performing secondary scanning or directly and reversely moving a linear motor workbench back to the initial position, performing coordination processing of obtained pointcloud data, generating a three-dimensional model with the measured tenons, and performing feature extraction and product qualification evaluation. The measuring machine and the measuring method are advantaged in that the three line laser sensors are carried by a fixed bridge type measurement platform, so that the disassembly and attitude adjustment times of the sensors are reduced, measurement repeatability and accuracy are improved, the position of the sensors is adjustable, and measurement adaptability is improved.

Description

technical field [0001] The invention belongs to the technical field of laser detection, and relates to a laser scanning measuring machine and a measuring method for tenons of aviation blades. Background technique [0002] Aviation blades are the core components of aero-engines, especially the machining accuracy of tenons seriously affects the installation quality of the blades, which in turn affects the overall performance and safe service life of the engine. Blade tenon detection is an important link, requiring high-precision and high-efficiency measurement. At present, the domestic measurement of blade tenon is mostly carried out by projection method combined with manual measurement with special measuring instruments. This method compares the projection with the standard sample, manually measures the concentric arc and the tenon tooth position, so as to ensure the measurement accuracy of the tenon. However, there are some problems with this method: one is that special pr...

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Problems solved by technology

However, there are some problems with this method: one is that special projection equipment is required; the other is that multiple sets of measuring instruments are required, and a large number of workers are required, so the measurement efficiency is low and the measurement consistency is poor; Matching; Fourth, the measurement workshop needs to be converted, and mechanical damage may occur during workpiece handling

[0004] In 2014, Tang Xiaodong et al. disclosed a rapid positioning detection mechanism for the tenon of the rotor blade in the patent CN201420644433.6. The inclination angle of the positioning surface of the device is the same as the inclination angle of the lateral end face of the tenon after positioning, and then the length of the tenon is detected by using a dial gauge. However, this device is only used for manual measurement of tenon length; in 2018, Hou Feilong et al. disclosed a device for measuring the straightness of dovetail tenons of aeroengine blades in the invention patent CN 201810541949.0. The locking mechanism of the base ensures the horizontal placement of the tenon in the fixture, which is detected by pushing the meter. However, this measuring device can only be used for the detection of the straightness of the tenon, and the measurement accuracy is not high

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