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Surface Texture Parameters

Surface Texture Parameters. Professor ： R. J. Chang Student ： R. Z. Huang Date ： 2004 / 04 / 14. Surface Texture Parameters. Amplitude Parameters Spacing Parameters Hybrid Parameters ADF and BRC Parameters. Roughness Amplitude Parameters. Ra Rq Rt 、 Rv 、 Rt

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Surface Texture Parameters

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  1. Surface Texture Parameters Professor：R. J. Chang Student：R. Z. Huang Date：2004 / 04 / 14

  2. Surface Texture Parameters • Amplitude Parameters • Spacing Parameters • Hybrid Parameters • ADF and BRC Parameters

  3. Roughness Amplitude Parameters • Ra • Rq • Rt、Rv、Rt • Rtm、Rvm、Rtm • Rymax • Rz

  4. Ra - Average Roughness Continuous: Discrete:

  5. Ra is Not the End of the Story These three surfaces all have the same Ra, even though the eye immediately distinguishes their different general shapes.

  6. Rq - Root-Mean-Square Roughness Continuous: Discrete: Rq is more sensitive to peaks and valleys

  7. Rt, Rp, and Rv

  8. Rtm, Rpm and Rvm

  9. Rymax (or Rmax) and Rz Rymax (or Rmax) - Maximum Roughness Height Within a Sample Length Rz(DIN), i.e. Rz according to the German DIN standard , is just another name for Rtm in the American nomenclature

  10. Roughness Spacing Parameters • Sm - Mean Spacing

  11. Roughness Hybrid Parameters Da - Average Absolute Slope Continuous: Discrete: Dq - RMS Average Slope Continuous: Discrete:

  12. Statistical Analysis • The Amplitude Distribution Function

  13. Rsk -Skewness Discrete: Continuous:

  14. The Bearing Ratio Curve The bearing ratio curve is the integral (from the top down) of the ADF tp as a parameter refers to the bearing ratio at a specified height

  15. Advanced Statistical and Bearing Ratio Analysis • Rk is the vertical height between the left and right intercepts of the - line through the ends of the minimum Htp 40% window. This part of the surface is called the "core roughness"

  16. Rk、Rpk、Rvk、MR1、MR2、A1 and A2 are determined by BRC

  17. Rpk、Rvk、MR1 and MR2 • Rpk Rpk is an estimate of the small peaks above the main plateau of the surface. • Rvk Rvk is an estimate of the depth of valleys which will retain lubricant in a functioning part. • MR1 MR1 is the fraction of the surface which consists of small peaks above the main plateau. • MR2 MR2 is the fraction of the surface which will carry load during the practical lifetime of the part.

  18. A1 and A2 • A1 The "area" of the peak portion of the bearing ratio curve is denoted by A1. It is related to Rpk and MR1 • A2 The "area" of the valleys in the Rk construction is denoted by A2. It is related to Rvk and MR2:

  19. Reference • http://www.predev.com/smg/parameters.htm#tp%20-%20Bearing%20Ratio • http://www.fujimfg.co.jp/benri/roughness.htm • http://www.htskorea.com/tech/spm/profile.pdf

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