lyöntilapaa

Lyöntilapaa is a term used in Finnish metalworking that refers to a strike plate, a component of punching and stamping tools that absorbs and distributes the impact of the punch. It is part of the die assembly and is positioned to receive the force transmitted from the punch onto the workpiece.

The primary function of the lyöntilapaa is to provide a robust, wear-resistant surface that transfers impact energy evenly and guides the workpiece during shaping or cutting. In typical configurations, the plate sits under or adjacent to the work area and may include replaceable inserts or a hardened surface to extend tool life. The exact design—flat, contoured, or with specific radii—depends on the shape requirements of the intended production part.

Materials and maintenance are tailored to high wear resistance. Lyöntilapat are usually made from hardened steel or carbide and are selected for hardness, toughness, and compatibility with the punching process. Regular inspection is necessary to detect indentation, pitting, or cracking, and replacements should be performed when tolerances or surface finish degrade. Proper alignment and securing of the plate are essential to minimize tool wear and ensure consistent part quality.

In practice, lyöntilapaa appears in stamping presses and punching machines across metalworking industries. The term may appear alongside related tooling components such as lyönti (punch), muotti (die), and die-set assemblies. While its usage is specialized, it is a standard concept in the maintenance and operation of impact-based sheet-metal forming processes.