An In-Situ Detection Method of Inner Cavity Surface Roughness Based on Two-point Rotational Friction

Abstract

The invention discloses an inner cavity surface roughness in-situ detection method based on double-point rotary friction, which comprises the following steps: integrating a friction assembly with a friction ball and a micro direct-current brushless motor together to serve as a finger-shaped probe, and sending the finger-shaped probe to a specified measurement surface through a mechanical motion part; after the positions of the finger-shaped probe and the measurement surface are adjusted, pressing the friction ball of the finger-shaped probe on the measurement surface according to a set normalload, finally driving, by the motor, the friction ball to rotate and rub on the measurement surface, and estimating the surface roughness according to the feedback current of the motor. On one hand, the equipment structure is simple, requirement for the environment is low, and the method can be easily integrated on a machine tool and other devices to achieve in-place measurement; and on the otherhand, the direct-current brushless motor can be made to be very small (diameter millimeter magnitude), so that the integrated finger-shaped probe can be made into a finger shape and is suitable for measuring the surface of the inner cavity. The friction ball is easy to replace, the requirement for the precision of the force sensor is not high, and the manufacturing cost is relatively low.

Description

technical field [0001] The invention relates to an on-site detection method of surface roughness based on two-point rotational friction, which is applicable to the detection of inner cavity surfaces and belongs to the field of surface roughness detection. Background technique [0002] The surface quality of a part largely reflects the functional properties of the object's surface, which is important in many fields such as mechanics, electronics, biomedicine, and optics. At the same time, the surface quality of parts will directly affect the accuracy, reliability, shock resistance and service life of the instrument. As one of the important indicators for evaluating surface quality, the rapid evaluation and measurement of surface roughness is of great significance to the processing efficiency and quality control of parts. [0003] In recent years, the development of precision machining industry has promoted the great progress of surface roughness measurement technology. Howe...

AI Technical Summary

Problems solved by technology

However, this kind of instrument is expensive, more than one million yuan, and the experimental conditions are very demanding. It is only suitable for sampling testing and laboratory research, and its application range is greatly limited.

Images