Method and system for measuring machining allowance based on point laser displacement sensor

Abstract

The invention discloses a machining allowance measurement method and system based on a point laser displacement sensor. According to the surface data of the inner wall of the deep cavity of the part, the measurement path is planned; a point laser displacement sensor is installed at the end of the six-degree-of-freedom robot, and the transformation relationship between the point laser coordinate system and the robot end coordinate system is obtained by using the fixed-point position change method; according to the planned measurement path Carry out actual measurement of the parts, obtain the distance value from the laser at each point to the inner wall of the deep cavity, and the robot pose information at the corresponding point; perform coordinate transformation according to the distance value and pose information, and measure the base coordinates of the deep cavity inner wall on the robot The point cloud under the system; register the measured point cloud with its theoretical CAD model to obtain the margin to be processed. The invention adopts the method of robot clamping point laser displacement sensor to obtain the machining allowance of the inner wall of the deep cavity, and has good flexibility, strong versatility, high measurement efficiency, low cost and accurate results.

Description

technical field [0001] The invention belongs to the field of measurement of complex parts, and more specifically relates to a method and system for measuring a machining allowance based on a point laser displacement sensor. Background technique [0002] At present, with the continuous development of science and technology, high-end components with complex curved surfaces and deep cavities (such as aero-engine casings) are more and more widely used in the aviation and aerospace fields. Usually, these deep cavities with complex curved surface configurations require high machining accuracy and surface quality in order to achieve the required performance requirements. Therefore, the efficient and high-precision measurement and machining allowance acquisition of deep cavity parts with complex curved surface configurations has become an urgent problem to be solved. [0003] At present, the measurement methods for the inner wall of deep cavity parts with complex curved surface con...

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Problems solved by technology

[0004] Aiming at the defects of related technologies, the object of the present invention is to provide a machining allowance measurement method and system based on a point laser displacement sensor, which aims to solve the problem of poor flexibility, low measurement efficiency, high cost and resulting inaccurate question

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