Three-dimensional surface roughness evaluation method

The three-dimensional surface roughness evaluation method addresses the limitations of existing technologies by using a portable two-dimensional laser displacement meter to accurately measure large, non-transportable objects, ensuring efficient and precise surface roughness parameter acquisition.

JP7720267B2Active Publication Date: 2025-08-07CHUGOKU MARINE PAINTS
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Patent Information

Application Number
JP2022018712
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2016-07-27
Filing Date
2022-02-09
Publication Date
2025-08-07
Estimated Expiration
2037-07-24

AI Technical Summary

Technical Problem

Existing methods for evaluating the surface roughness of large, non-transportable objects like ship hulls are limited by the need for large and heavy measurement devices, which are difficult to handle and have restricted operating ranges, and they struggle to accurately measure shape parameters of relatively smooth surfaces.

Method used

A three-dimensional surface roughness evaluation method using a two-dimensional laser displacement meter moved by a mechanism, averaging displacement data in the Y-axis direction to generate reference plane data, correcting for eccentricity, and subtracting it from displacement data to obtain accurate three-dimensional surface roughness data.

Benefits of technology

Enables quick, continuous, and direct measurement of surface roughness parameters for large objects, ensuring portability and accuracy by correcting for mechanical errors and surface tilt, allowing for efficient evaluation of complex surfaces.

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Abstract

A three-dimensional surface roughness evaluation device and a three-dimensional surface roughness evaluation method are provided that can quickly obtain surface roughness parameters relating to the three-dimensional surface roughness of an untransportable object, structure, or the like. [Solution] A three-dimensional surface roughness evaluation device comprising a two-dimensional laser displacement meter, a movement mechanism that moves the two-dimensional laser displacement meter in the X-axis direction, a movement distance reading device that reads the movement distance of the two-dimensional laser displacement meter in the X-axis direction, and a calculation device that generates three-dimensional surface roughness data of the object to be measured based on the displacement data acquired by the two-dimensional laser displacement meter and the movement distance data acquired by the movement distance reading device. The two-dimensional laser displacement meter is positioned so that its width direction coincides with the Y-axis direction, and the calculation device is configured to average the displacement data acquired by the two-dimensional laser displacement meter at regular intervals in the X-axis direction in the Y-axis direction to generate reference surface data for each coordinate, and to generate three-dimensional surface roughness data for the object to be measured.
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