Recent advances in separation of roughness, waviness and form

Raja, J.; Muralikrishnan, Balasubramanian; Fu, Sheng-Yu

doi:10.1016/s0141-6359(02)00103-4

Cited by 260 publications

(142 citation statements)

References 13 publications

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“…(13), was utilised as an earing judgement. Waviness presents a surface that appears periodically at longer intervals than the roughness [20]. Thus, through a cut-off filter, which is a low pass Gaussian filter, the roughness information was transferred into earing information.…”

Section: Resultsmentioning

confidence: 99%

Effects of hydraulic pressure on wrinkling and earing in micro hydro deep drawing of SUS304 circular cups

Luo

Wei

Wang

et al. 2016

Int J Adv Manuf Technol

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Influences of hydraulic pressure on forming features in micro hydro deep drawing are different from those in normal drawing due to the small size of specimens. In this study, micro hydro deep drawing of SUS304 sheets was carried out in order to study the impacts of the hydraulic pressure on the quality of the drawn cup. Experimental results indicate that there is a critical hydraulic pressure range from 3 to 6 % of the blank's initial yield stress, where wrinkling and earing development trends change twice. The wrinkling and the earing of the drawn cup also reach their local extremes in the critical pressure range. The cup earing value moves in the opposite direction from the wrinkling value. Hydraulic pressure affects the wrinkling and the earing of the drawn cup through changes in the micro-frictional condition, the shape of the blank and its strain-stress state. Micro-finite element (FE) simulation which takes these factors as well as the material size effects into consideration showed similar results to the experimental ones, thus validating the experimental results and the suitability of the micro-simulation model for micro-forming FE simulation. The experimental and simulation results indicate that the critical hydraulic pressure based on the blank's initial yield stress can restrict the wrinkling and the earing of the drawn cup. Ultra-high pressure has the potential to avoid the cup wrinkling and earing. AbstractInfluences of hydraulic pressure on forming feature of cups are different in micro hydro deep drawing due to size effects. In this study, the micro hydro deep drawing of SUS304 sheets was conducted to study the impacts of the hydraulic pressure on drawn cups' quality. Experimental results indicate that there is a critical hydraulic pressure range from three to six percent of blank's initial yield stress, where wrinkling and earing developing trends change twice. The wrinkling and earing also reach their local extremums in the critical pressure range. The earing is strongly related to the wrinkling phenomenon. Friction plays an important role in micro hydro deep drawing and significantly affects the wrinkling and the earing of the drawn cup. Moreover, micro scale simulation with consideration of the size effects and friction change presents similar wrinkling development trend to that in the experiments, which proves the influence and importance of the size effects and friction change.

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Section: Resultsmentioning

confidence: 99%

Effects of hydraulic pressure on wrinkling and earing in micro hydro deep drawing of SUS304 circular cups

Luo

Wei

Wang

et al. 2016

Int J Adv Manuf Technol

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“…The paperboard reels were provided by Iggesund Paperboard AB, Iggesund, Sweden and the Newspaper reels by SCA Ortviken Paper Mill, Sundsvall, Sweden. Raja et al 2002). Form and position error are also the topography components that can develop due to the shape of the sample under test and due to the insecure clamping or misalignment of the paper samples or incorrect positioning of the measuring device.…”

Section: Sample Reels Descriptionsmentioning

confidence: 99%

Online surface roughness characterization of paper and paperboard using a line of light triangulation technique

Alam¹,

Manuilskiy

Thim

et al. 2012

Nordic Pulp &Amp; Paper Research Journal

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SUMMARY:Within both the paper and paperboard industries, real time monitoring and measurement of surface roughness of a paper moving at high velocities is an important and challenging area of research. The uniform surface, for an entire production, can be effectively achieved by monitoring and controlling the paper surface roughness, in real time during the manufacturing steps. Presently the majority of paper industries rely on traditional laboratory profilometers. The obvious limitations of lab profilometers are that these are slow, do not measure the quality of entire reels but rather deal with only a few small pieces of samples taken from the end of the reels and it is difficult to make any possible correction in the production lines without knowing the online roughness data. To eradicate the disadvantages associated with conventional measurements, an online prototype instrument has been developed that measures the surface roughness during the manufacturing steps, and is based on a line of light triangulation technique. The prototype technique will be of assistance in ensuring tight process control in order to maintain both a better and a uniform quality throughout the entire production. It measures the whole reel, meter by meter, in traditional units of roughness and is also capable of characterizing the topography in a wide range of wavelength spectra. The article presents the online analyses results obtained from the developed prototype. The real time measurements, in a paperboard pilot mill, have successfully characterized and distinguished 16 different grades of newspaper and paperboard reels including reels which have the same family of quality grades and materials.

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“…The separation of roughness profile is usually based on a mean line and filtering methods are commonly adopted to determine the mean line. The filters include 2RC filter, Gaussian filter, Spline filter and Wavelet filter [3].…”

Section: Introductionmentioning

confidence: 99%

Separation of Surface Roughness Profile from Raw Contour based on Empirical Mode Decomposition

Liu

Zhou²

2015

Proceedings of the 2015 International Conference on Advances in Mechanical Engineering and Industrial Informatics

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Abstract. Engineering surfaces are comprised of different wavelength bands commonly referred to as roughness, waviness and form. The Gaussian filter is a common technique to separate surface roughness profile but it has some drawbacks. This paper presents an approach of utilizing Empirical Mode Decomposition (EMD) to separate surface roughness profile from raw contour. The EMD describes a time-signal with a series of Intrinsic Mode Functions (IMFs) and the residue. The residue and IMFs of frequency less than 10 within an evaluation length, are used for reconstructing EMD reference line. To achieve more accurate mean line, an Amplitude Weighting Factor (AWF) μ is applied to the IMF whose frequency is maximum among the selected IMFs. The EMD reference line is thus modified as EMD mean line. Surface roughness profile can be further separated and roughness parameters can be calculated. The comparison of EMD method and Gaussian filter is also presented.

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Recent advances in separation of roughness, waviness and form

Cited by 260 publications

References 13 publications

Effects of hydraulic pressure on wrinkling and earing in micro hydro deep drawing of SUS304 circular cups

Effects of hydraulic pressure on wrinkling and earing in micro hydro deep drawing of SUS304 circular cups

Online surface roughness characterization of paper and paperboard using a line of light triangulation technique

Separation of Surface Roughness Profile from Raw Contour based on Empirical Mode Decomposition

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