表面粗さ測定 - 高速、3D、光学式

Quality control of optical polishing and optical components

Application note

Roping characterization methods on aluminum alloy sheets

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Surface quality control for additive manufacturing / 3D-printing

Application note

Surface roughness measurement, profile and areal evaluation of roughness parameters

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Additive manufactured parts produced with different machining parameters resulting in different surface textures

Classification chart of topography components: form deviation, texture and flatness

Opticlal profiler TopMap measuring various 3D surface texturings of additive manufacturing

3d texture of a 3D printed surface by whitelight interferometry

Additive manufactured parts produced with different machining parameters resulting in different surface textures

Classification chart of topography components: form deviation, texture and flatness

Opticlal profiler TopMap measuring various 3D surface texturings of additive manufacturing

3d texture of a 3D printed surface by whitelight interferometry

Definition and ISO standards for surface texture

Surface texture is defined and characterized using various parameters and standards, including those established by the International Organization for Standardization (ISO). The relevant ISO standards for defining and measuring surface texture include:

ISO 4287: This standard defines terms, definitions, and parameters related to surface texture. It provides a comprehensive guide to understanding surface texture terminology and tactile measurement methods.
ISO 25178: This standard addresses the measurement of surface texture using areal (3D) measurement techniques, such as contact profilometer, chromatic confocal gauge, coherence scanning interferometry and focus variation. It introduces parameters like Sa (arithmetical mean height) and Sq (root mean square height) for characterizing 3D surface texture.
New ISO 21920: This series featuring three parts replaces some of the standards, some of which are decades old, consolidating information and providing greater clarity in many areas. At the same time, there is a harmonization with the American ASME standard and ISO 25178 for surface finishes.

材料の質感向上

材料の表面処理技術はトライボロジー特性に大きく影響します。製品表面の摩耗特性、潤滑性、軽量化を最適化する必要がある場合には、質感（テクスチャ）は必須です。質感（テクスチャ）のマイクロナノレベルの分解能の特性評価手法は、ひいては燃焼エンジンやトランスミッション部品などの製品の機能性向上に極めて重要です。

ポリテックでは、お客様のご要望に応じて、材料の製造工程でも表面の構造を評価できるさまざまな非接触表面粗さ・形状測定機をご用意しています。

デモのご依頼

Application guide Roughness evaluation according to the ISO 21920 standard

Download the exclusive guide on ISO 21920

Read the full exlusive paper (login) about the relevance of technical drawings (replacing ISO 1302), why ISO 21920 is more than just Ra (replacing ISO 4287 and ISO 13565-2/ -3) and how to achieve valid measurement results (replacing ISO 4288).

Roughness evaluation according to ISO 21920
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Scheme of line profile evaluation of surface roughness according to ISO 4287, 4288 and ISO 3274

Characterize (3D) textures with optical and tactile profilometry

There are different approaches for measuring surface texture:

optical, non-contact measurements
and tactile, line-based measurements.

ISO standards provide a common framework for characterizing and specifying a surface texture, regardless of the measurement method used.

Tactile surface texture measurement

Tactile surface profilers use a stylus or probe to physically touch the surface of the material being measured. The stylus moves along the surface, recording height variations during movement. These profilers are used for measuring surface roughness and texture parameters like Ra, Rz, and Rq. They are typically ok for a wide range of surfaces, including those that may be transparent or opaque. Tactile measurement provides a direct contact with the surface, analyzing for detailed surface features. However, tactile profilers can potentially damage delicate or soft surfaces, and become time-consuming and slow when measuring large or entire areas. In addition the stylus is prone to wear resulting in measurement deviations over time.

お問い合わせ

Scheme of areal evaluation of surface roughness acc. to ISO 25178-1,-2,-3

Optical scanning of 3D textures

White-light profilometers or coherence scanning interferometers are optical surface profilers, providing a non-contact measurement approach, reliably capturing 3D surface topography data without physically touching the surface. They are excellent for measuring 3D surface roughness parameters and texture, such as Sa and Sq, as well as for capturing detailed surface structures and shapes. Optical profilers are non-destructive and suitable for all sorts of surfaces including fragile or delicate ones. They are also faster for measuring larger surface areas. However, optical profilers may have limitations on shiny and bent surfaces. In summary, the choice between optical and tactile surface profiling methods depends on the specific application, the type of surface being measured, the required accuracy, and other factors. Both methods have their advantages and limitations.