Tag Archive Common wear types of CNC machining parts

Common wear types of CNC machining parts

The common wear types in machining include running in wear, hard grain wear, surface fatigue wear, thermal wear, phase change wear and hydrodynamic wear.

Running in wear is a kind of wear under normal load, speed and lubrication, which develops slowly and has little effect on machining quality in a short time.

Hard grain wear is due to the parts themselves or from the outside into the machine tool hard particles, mixed into the processing area, by mechanical cutting or grinding, causing damage to the parts, which has a serious impact on the processing quality.

Surface fatigue wear is a kind of mechanical damage caused by micro cracks or pits under alternating load. This kind of wear is usually closely related to the pressure, load characteristics, parts material, size and other factors.

Hot wear refers to the phenomenon that the heat generated in the process of friction acts on the parts, such as tempering softening, burning and wrinkling. This kind of wear usually occurs in high-speed and high-pressure sliding friction, which is destructive and accompanied by accident wear.

Corrosion wear is a kind of chemical action, that is, chemical corrosion causes wear. When the part surface contacts with acid, alkali, salt liquid or harmful gas, it will be subject to chemical erosion, or the part surface combines with oxygen to form hard and brittle metal oxide which is easy to fall off and wear the part.

Phase transformation wear is a kind of wear caused by long-term work at high temperature, the grain of metal structure on the surface of the part becomes larger when heated, and the grain boundary is oxidized, resulting in a small gap, which makes the part fragile and wear resistance decreased. Hydrodynamic wear is caused by the impact of liquid or particles mixed in liquid on the surface of parts at a faster velocity.