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Fluid polishing technology known from data

Roughness parameter, a measure of quality stability

What is the maximum height Rz?

The distance between the peak line and the bottom line is measured in the direction of the vertical magnification of the roughness curve, and this value is expressed in micrometers (µm).
It is calculated as the sum of the highest part (maximum mountain height: Rp) and the deepest part (maximum valley depth: Rv).

Maximum height Rz
What is Arithmetic Mean Roughness Ra?

This is the value in micrometers (μm) obtained by extracting the standard length in the direction of the average line from the roughness curve, taking the X-axis in the direction of the average line and the Y-axis in the direction of the vertical magnification of this extracted portion, and expressing the roughness curve as y=f(χ).
The average value of the unevenness state.

Arithmetic mean roughness Ra

Mirror finish

  • The mirror surface generally required is Ra value of 0.1μm.
  • 『 "ALGOVISION's idea of a mirror finish is an ultra-mirror finish. 』
Improvement of Ra value in fluid polishing (for mirror finish)

If you just shave off Rp (the height of the largest peak in the roughness curve of the surface at the reference length), the Ra value will not improve as much as you would like because Rv remains.

Grinding Rp

By cutting down to Rv (the depth of the largest valley in the surface roughness curve at the reference length) and eliminating Rz, Ra value is improved and an ultra-mirror finish is achieved.

Grinding to Rv


KEYENCE Measurement Report

Internal surface roughness evaluation data before and after intelligent fluid polishing

  • ●Material
  • 1. SUS304( Φ0.3Pipe)

Use of machines

  • ●Measuring machine : KEYENCE VK-X3000
  • ●system : laser
  • ●resolution : 0.01 nm
1-Before. SUS304 Raw material (before grinding)
measured value
measured valueRa:1.478μm Rz:9.676μm
Φ0.3Raw Materialsデータ

1-After. SUS304 After intelligent fluid polishing
measured value
measured valueRa:0.070μm Rz:0.519μm
Φ0.3Data after polishing

《Measurement value comparison》

Ra:1.478μm → Ra:0.070μm
Rz:9.676μm → Rz:0.519μm


ZYGO Newview9000Measurement Report

Internal surface roughness evaluation data before and after intelligent fluid polishing

  • ●Material
  • 1. SUS316L( Semi-seamless pipe )

Use of machines

  • ●Measuring machine : ZYGO Newview9000
  • ●system : White interferometer
  • ●Measurement time : 5 th min
  • ●resolution : 0.1 nm
Use of machines
1-Before. SUS316L Raw material (before grinding)

《Roughness evaluation》
Ra:24.690nm = 0.024μm(micrometer transformation) 

Roughness evaluation
1-After. SUS316L After intelligent fluid polishing

《Roughness evaluation》
Ra:9.723nm = 0.009μm(micrometer transformation) 

Roughness evaluation after fluid polishing