työstöilmiö

The työstöilmiö, often translated as "machining phenomenon" or "workpiece effect," refers to observable changes in the properties of a material that occur during a machining process. These changes are not a result of the intended material removal but rather the influence of the mechanical, thermal, and chemical interactions between the cutting tool and the workpiece.

Key aspects of the työstöilmiö include surface hardening, also known as work hardening, where the material at the surface and in the subsurface layer becomes plastically deformed and thus stronger and harder. This can be beneficial in some applications, improving wear resistance, but it can also negatively affect subsequent machining operations by increasing tool wear.

Thermal effects are also significant. The heat generated during cutting can alter the microstructure of the material, potentially leading to phase transformations, annealing, or even melting in extreme cases. These thermal changes can affect the material's ductility, toughness, and fatigue strength.

Chemical reactions can occur between the tool material, the workpiece material, and the cutting fluid (if used). These can lead to adhesion, diffusion, or the formation of new compounds at the interface, influencing friction, wear, and surface integrity.

The työstöilmiö is a crucial consideration in manufacturing as it impacts the final quality and performance of machined components. Understanding and controlling these phenomena allows for optimization of machining parameters, tool selection, and cutting fluid application to achieve desired surface properties and dimensional accuracy.