Non-contact extreme value method inner diameter detection method and device

Abstract

The invention belongs to the technical field of high-precision non-contact detection. Only qualitative detection can be carried out by adopting contact detection; the surface of the part is possibly scratched during detection; sampling points are few, the detection efficiency and precision are low; by adopting a laser non-contact measurement three-point method, a least square method, normal and cosine laws and other methods, the calculation formula is tedious, the process is complex, the system operation is slow, and the efficiency is low. The invention provides a non-contact extreme value method inner diameter detection method and device. The rotation radius of the sensor is determined after the device is calibrated through a standard part; the sensor mounting rod extends into the inner cavity of the to-be-measured piece for measurement, and the inner diameter of the to-be-measured piece is calculated according to measured data and the rotation radius of the sensor. According to the method, nondestructive measurement is achieved, the detection precision is high, calculation is simple and efficient, large-batch offline or online detection can be met, and the requirement for the rotation control precision of the sensor is low.

Description

technical field [0001] The invention relates to the technical field of high-precision non-contact detection, and more specifically, relates to a non-contact extreme value method inner diameter detection method and device. Background technique [0002] In most machining parts, there are usually many inner diameter parts involved, such as the inner diameter of the shaft hole, the inner diameter of various rotating body parts, the inner diameter of cylindrical or tubular parts, etc. In order to ensure that the assembly is in good contact or meet the performance, etc., there are high requirements for the processing of the inner diameter, and the processing quality directly affects the assembly accuracy and performance. Such parts are used in all walks of life, and there are a large number of them. Therefore, it is of great significance to accurately and efficiently detect the inner diameter of parts. [0003] Since the inner diameter is an internal dimension, especially for par...

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Problems solved by technology

[0004] The above contact methods such as the plug gauge detection method can only be used for qualitative detection; the surface of the part may be scratched when there is another detection; there are few sampling points for detection, and the inner diameter cannot be accurately evaluated; the detection efficiency is low and the accuracy is low; Contact measurement, but the use of three-point method, least square method, sine law and other methods to calculate the formula is cumbersome, the process is complicated, the system runs slowly, and the efficiency is low. Therefore, with the rapid development of industry and technology, the amount of parts processed is increasing. The above calculation methods can no longer meet the simple and fast detection requirements

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