| GUO Jing,WU Chang-jiang,LI Zhi-wei.3D Surface Profile Test on Auto Sheet 180BH[J],47(1):249-253 |
| 3D Surface Profile Test on Auto Sheet 180BH |
| Received:July 03, 2017 Revised:January 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.01.039 |
| KeyWord:auto sheet white-light-interference 3D test surface profile waviness roughness |
| Author | Institution |
| GUO Jing |
Research and Design Institute of Bengang Steel Plates Co. Ltd, Benxi , China |
| WU Chang-jiang |
Research and Design Institute of Bengang Steel Plates Co. Ltd, Benxi , China |
| LI Zhi-wei |
Research and Design Institute of Bengang Steel Plates Co. Ltd, Benxi , China |
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| Abstract: |
| The work aims to determine whether auto sheet surface meets requirements of automobile factory standards by testing 3D surface profile and surface structure parameters of the auto sheet waviness and roughness. 3D contours, waviness and roughness of the auto plate surface were measured with a 3D optical profiler utilizing white light interference according to relevant international standards provided with room temperature of 15~30 ℃, humidity of less than 80% and no coagulation condition. Principle and method of measurement based on white light phase-shift interferometry were introduced by analyzing formation process and classification of automobile plate surface structure. Taking auto sheet 180BH as an example, the thickness was 0.8 mm, maximum height of the surface reached 20 μm, height of the middle was lower, and the minimum height was -13 μm. Sampling length was 50 mm, and linear polynomial processing was performed in horizontal direction. Then, shape error in the sampling length was removed by performing 5-order polynomial fitting. Finally, λc=0.8 mm short wave part was used with Gaussian filter, and obtained waviness degree Wa was 0.404 μm, and surface roughness Ra was 1.089 μm. Test results show that waviness of the auto sheet 180BH is below 0.5 μm and surface roughness is below 1.2 μm, which are in line with the requirements for automotive plant products. White light phase-shift interference 3D optical profiler can clearly measure surface profile of the auto sheet and obtain surface structure parameters, hence it can provide an important means for evaluating surface quality of the auto sheet. |
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