Nyíróer

Nyíróerő, commonly written nyíróerő in Hungarian, denotes the force that a cutting tool must exert on the workpiece to shear material during metal cutting. It is a principal component of the cutting force and is typically considered in relation to the main cutting force acting in the direction of tool travel; other related components include thrust (along the tool axis) and, in some analyses, radial forces that affect tool wear and workpiece deflection. In texts where diacritics are omitted, the term may appear in non-accented spellings such as nyiroero or nyiroer, depending on the publication.

Measurement of nyíróerő is usually performed with dynamometers or force sensors mounted on machine tools, such as lathes or milling centers. Data are recorded in multiple directions to separate the main cutting force from the thrust and radial components. The measured forces depend on tool geometry, cutting conditions, and workpiece material, and they are often used to estimate chip formation, tool wear, and process stability.

Several factors influence nyíróerő, including material hardness and ductility, depth of cut, cutting speed, feed rate, and coolant application. Tool geometry—rake angle, edge radius, and clearance—also plays a critical role by altering chip formation and friction on the tool face. In engineering practice, nyíróerő is a key parameter in machinability studies, process modeling, and finite-element simulations of metal cutting.

See also: metal cutting, machinability, cutting forces, tool wear, dynamometry.