摘要
目的测试汽车板的三维表面轮廓及表面结构参数波纹度和粗糙度,判定汽车板表面是否符合汽车厂标准的要求。方法利用白光干涉的三维光学轮廓仪,在15~30℃、湿度小于80%、无凝结的条件下,依照相关国际标准,测量汽车板表面三维轮廓及波纹度和粗糙度。通过分析汽车板表面结构的形成过程及其分类,介绍了基于白光相移干涉法测量的原理及方法。结果以180BH汽车板为例,厚度为0.8 mm,测试得到其表面最大高度可达到20μm,中间的高度较低,最低高度为-13μm。取样长度50 mm,水平方向经过一次多项式处理,然后经过5次多项式拟合,去除取样长度内的形状误差,最后利用高斯滤波器去除λc=0.8mm短波部分,得到取样长度内的波纹度Wa为0.404μm,表面粗糙度Ra为1.089μm。结论测试结果显示汽车板180BH的波纹度小于0.5μm,表面粗糙度小于1.2μm,均符合汽车厂产品的要求。白光相移干涉三维光学轮廓仪能够清晰地测量汽车板的表面轮廓,得到表面结构参数,为汽车板表面质量的评价提供了一个重要的手段。
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, 2c=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 pan. 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.
出处
《表面技术》
EI
CAS
CSCD
北大核心
2018年第1期249-253,共5页
Surface Technology
关键词
汽车板
白光干涉
三维测试
表面轮廓
波纹度
粗糙度
auto sheet
white-light-interference
3D test
surface profile
waviness
roughness
