Propeller type surface contour error measurement instrument and method

Abstract

The invention discloses propeller type surface contour error measurement instrument and method. The propeller type surface contour error measurement instrument is characterized in that a gantry structure is adopted, a left upright, a right upright and a top cross beam are arranged on a base, and a revolving spindle is arranged on a cross beam; the lower end of the revolving spindle is horizontally and fixedly connected with a measuring arm; a linear guiderail is arranged on the bottom surface of the measuring arm along the radial direction of the revolving plane of the measuring arm, a working platform capable of doing linear movement along the linear guiderail is arranged on the linear guiderail, and a displacement sensor is arranged on the working platform; and a Y-direction working platform and an X-direction working platform are arranged on the base in an overlapping, and the blade of a detected propeller is arranged in a positioning groove at the top surface of the X-direction working platform. The measuring device and the measuring method are established by adopting a cylindrical coordinate system according to the axial symmetry structure characteristics of the propeller blade. The measuring device and the measuring method are fast in data acquisition, have no objective errors of an operator, and are simple in follow-up error processing and analysis, and can be used for precision measurement on size parameters and geometric error parameters of large revolving parts.

Description

technical field [0001] The present invention relates to a propeller profile error measuring instrument and measuring method, especially suitable for the detection of the propeller blade surface error of large ships and underwater vehicles, and can also be used for steam turbine blades, hydraulic turbine blades, aviation propellers and other large-sized Precision measurement of rotary parts. Background technique [0002] As a widely used propeller, the propeller is the core component of the power system of ships and underwater vehicles. Large mechanical parts with complex surfaces. The processing accuracy of its surface shape is an important factor affecting the service life, mechanical efficiency and noise level of the propeller. However, because its shape is a complex free-form surface, and its volume and weight are large, the measurement of the blade profile and related dimensions and parameters has always been a difficult problem in the industry during the manufacturing...

AI Technical Summary

Problems solved by technology

The templates used in the template method are all handmade, the surface accuracy is difficult to guarantee, and the rigidity is poor and easy to deform; although the three-coordinate measuring machine has high measurement accuracy, it has high environmental requirements and a small measurement range; the laser tracker has gradually developed in recent years The method and the photoelectric theodolite method can realize high-precision detection of blades. They measure the angle and distance of a single point in the space by the instrument, obtain the three-dimensional coordinates of the target point in real time, and use software to manage and process the data to obtain the spatial geometry of the blade surface. information

These methods require manual participation, such as adjusting the target mirror and moving the position of the target mirror at intervals to achieve point-by-point measurement. The measurement efficiency is low, and it cannot meet the dense point cloud collection requirements required for production and testing.

The current popular measurement mode using flexible joint coordinate measuring machines and scanning probes is increasingly being watched and welcomed by the market. It can quickly obtain 3D surface data of dense point clouds, but it still requires manual operation, and the measurement efficiency is relatively low, and the measurement accuracy is also low. to be further improved

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