Hiontakarkeus

Hiontakarkeus is a Finnish term used to describe the surface roughness produced by grinding operations. It refers to the level of micro-roughness on a material surface after grinding and is typically quantified using standard roughness parameters such as Ra (arithmetic average roughness) and Rz (average peak-to-valley roughness). In Finnish technical literature, hiontakarkeus is used in process specifications, quality documentation, and metrology reports to define the acceptable finish of ground parts.

Measurement and characterization: Surface roughness is measured with contact profilometers or non-contact instruments. A cutoff length and evaluation length are defined according to relevant standards (for example ISO 4287). Measurements are often taken at multiple traces along a surface to capture variability and provide a representative assessment of the grind finish.

Impact and control: Hiontakarkeus influences wear, lubrication retention, fatigue life, and appearance. Generally, lower roughness improves wear resistance and sealing, but achieving a smoother finish may require more grinding passes. Control is achieved through grinding parameters (wheel grain size and hardness, grinding speed, feed rate, depth of cut), dressing practices, and coolant conditions. Proper workpiece preparation and fixturing also affect the resulting finish.

Standards and terminology: While hiontakarkeus is a Finnish-language descriptor rather than an international parameter, it aligns with international roughness concepts. International standards define the measurement methods and values (Ra, Rz, etc.) used to quantify the surface finish of ground parts.

Applications: Hiontakarkeus is a common consideration in manufacturing sectors where defined surface finish after grinding is required, such as automotive, machinery, tooling, and precision components.

See also: surface roughness, Ra, Rz, grinding, profilometry, ISO 4287.