On-machine measurement of the grinding wheels’ 3D surface topography using a laser displacement sensor

A novel profilometer for three-dimensional (3D) surface topography measurement is presented. The profilometer has large measuring range, high precision and small measuring touch force. It is composed of a two-dimensional (2D) displacement sensor, a 3D platform based on vertical scanning, measuring and control circuits and an industrial control computer. When a workpiece is measured, the vertical undulation of the profile at a sampling point leads to a zero offset of the 2D displacement sensor. According to the zero offset, a piezoelectric actuator and a servo motor drive the vertical scanning platform to move vertically to ensure that the lever returns to its balance position. So the non-linear error caused by the rotation of the lever is very small even if the measuring range is large. When the stylus barges up against a steep wall, the horizontal resistance force results in another zero offset of the 2D displacement sensor. If the zero offset exceeds a quota, the vertical scanning platform descends to make the stylus climb the steep wall successfully. According to the theoretical and experimental analysis, the profilometer can measure roughness, profile of sphere, step, groove and other 3D surfaces with curvature precisely.

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A learning-based self-calibration for correcting distortion and field curvature in 3D surface topography measurement

Optics Letters ◽

10.1364/ol.427142 ◽

2021 ◽

Author(s):

Xiaoyu You ◽

Yuhang Wang ◽

Yifei Li ◽

Jian Liu ◽

Kang Gu

Keyword(s):

Surface Topography ◽

Self Calibration ◽

3D Surface ◽

Field Curvature ◽

3D Surface Topography

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Leakage Monitoring in Static Sealing Interface Based on Three Dimensional Surface Topography Indicator

Journal of Manufacturing Science and Engineering ◽

10.1115/1.4040620 ◽

2018 ◽

Vol 140 (10) ◽

Cited By ~ 10

Author(s):

Yiping Shao ◽

Yaxiang Yin ◽

Shichang Du ◽

Tangbin Xia ◽

Lifeng Xi

Keyword(s):

Surface Topography ◽

Three Dimensional ◽

Machining Process ◽

Void Volume ◽

Engineering Practice ◽

High Definition ◽

Monitoring Method ◽

3D Surface ◽

3D Surface Topography ◽

Leakage Monitoring

Leakage directly affects the functional behavior of a product in engineering practice, and surface topography is one of the main factors in static seal to prevent leakage. This paper aims at monitoring the leakage in static sealing interface, using three-dimensional (3D) surface topography as an indicator. The 3D surface is measured by a high definition metrology (HDM) instrument that can generate millions of data points representing the entire surface. The monitoring approach proposes a series of novel surface leakage parameters including virtual gasket, contact area percentage (CAP), void volume (VV), and relative void volume (SWvoid) as indicators. An individual control chart is adopted to monitor the leakage surface of the successive machining process. Meantime, based on the Persson contact mechanics and percolation theory, the threshold of leakage parameter is found using finite element modeling (FEM). Experimental results indicate that the proposed monitoring method is valid to precontrol the machining process and prevent leakage occurring.

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