Core space dimension precision measurement apparatus based on ultrasound and method thereof

Abstract

The invention mainly discloses a core space dimension precision measurement apparatus based on ultrasound and a method thereof. An ultrasound measurement principle is employed to measure wall thickness of a piece to be measured, and through fusion processing of measurement data, core space dimension data of a measured piece is calculated. To a precision measurement problem of a slight inside dimension, the invention brings forward a core space dimension detection system based on ultrasound, and the system has the characteristics of a non-contact mode, fast detection speed, a simple principle, an accurate result and relative low cost. By utilizing multiple groups of ultrasonic probes, the wall thickness of the measured piece is subjected to non-contact measurement, extrusion and wearing of the measured piece are avoided, and measurement security is ensured. Simultaneously, fusion processing is carried out on the measurement data of the probes, through data of different angles, different times, different layers, different amplitudes and shapes and the like of the probes, an internal dimension, a shape and distribution of the measured object are determined, and comprehensive data of a core space dimension of the measured piece is provided.

Description

technical field [0001] The invention relates to the fields of machine vision technology and industrial detection technology, in particular to an ultrasonic-based precision measuring device for inner cavity size and a method thereof. Background technique [0002] Machine vision is a comprehensive technology that integrates digital image processing, machinery, control, computer software and hardware and other technologies. Machine vision systems can realize non-contact detection of products and can quickly obtain a large amount of information. Therefore, machine vision technology, as an important detection method, has attracted increasing attention and has been more and more widely used in industrial detection. . [0003] With the continuous development of manufacturing technology, the demand for precision workpiece inner cavity parts is growing rapidly, and its application fields are also expanding. The internal scale measurement technology of precision workpieces provides ...

AI Technical Summary

Problems solved by technology

Since the surface to be measured is inside, the measuring tool is limited by the space, so that the general probe cannot penetrate into the inside of the measured part, resulting in the inability to carry out the measurement process. Therefore, the development of precision workpiece internal scale technology is limited, making the principle and method of internal dimension measurement Become an important technical problem in this field in the world

At present, most domestic iron and steel companies use standard measuring tools such as vernier calipers to measure workpieces manually, which can only measure a limited number of dimensions. Not only is the accuracy low, but the measurement results cannot fully describe the condition of the workpiece.

Although scholars at home and abroad have conducted a lot of research on this and proposed some measurement methods, such as pneumatic measurement methods, which have met the requirements of some occasions to a certain extent and achieved a certain measurement accuracy, but combined with these measurement methods, they exist. The common problems are: (1) the measurement accuracy is not high enough; (2) the influence of impurities and burrs on the surface of the inner dimension cannot be eliminated; (3) the measurement task cannot be completed for deep holes or blind holes

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