Method for measuring diameter and coordinate position of spatial curved surface micro-hole in non-contact mode

Abstract

The invention belongs to the field of measurement of the diameter and the space coordinate geometric dimensioning of a spatial curved surface thin-wall micro-hole, and relates to a method for measuring the diameter and the coordinate position of the spatial curved surface micro-hole in a non-contact mode, in particular to the method for measuring the diameter and the coordinate position of the spatial curved surface micro-hole in a blade body of a blade by compositely designing and applying a telecentric optical lens and a five-axis coordinate measurement machine. A contact-type probe of the five-axis optical composite coordinate measurement machine is used for setting up a measuring basis of the diameter and the coordinate position of the spatial curved surface micro-hole of a workpiece, a two-dimensional rotating table is used for determining a spatial posture according to the direction of the axis of the spatial curved surface micro-hole, and the telecentric optical lens is used for extracting an image of the spatial curved surface micro-hole. The method can solve the difficult technical problem that data extraction and evaluation can not be conduced due to the fact that the image of the micro-hole is blurred, digitalized precise measurement of the diameter and the coordinate position of the spatial curved surface micro-hole is achieved, and the feasible measurement method is provided for effectively controlling machining quality of a gas film hole of the blade of an aviation engine and the like.

Description

technical field [0001] The invention belongs to the field of measuring the diameter of a thin-walled micro-hole on a curved space surface and the geometric dimensions of space coordinates, specifically a method for non-contact measurement of the diameter and coordinate position of a micro-hole on a curved space surface, in particular combining a telecentric optical lens with a five-axis coordinate measuring machine Composite design and application, and a method for measuring the diameter and coordinate position of tiny holes on the spatial curved surface of the blade body. Background technique [0002] In the prior art, the main methods and existing problems of measuring the diameter and coordinate position of the hole: [0003] (1) Three-coordinate measurement method [0004] Using a three-coordinate measuring machine and its equipped two-axis precision turntable (that is, a five-axis three-coordinate measuring machine), the measurement of the diameter and coordinate posit...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a non-contact method for measuring the diameter and coordinate position of tiny holes on a curved surface in space. The precise positioning of the blade space is realized by using a two-axis precision turntable and a blade positioning device. Through a telecentric optical lens and a five-axis coordinate measuring machine Composite design and application, to solve the technical problem of fuzzy micro-hole images that cannot extract data and evaluate, realize digital precision measurement of the diameter and coordinate position of micro-holes on the measurement space surface, and provide a tool for effectively controlling the processing quality of aero-engine blade air film holes, etc. a viable method of measurement

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