The common types of wear and tear of precision parts machining mainly include running wear, hard grain wear, surface fatigue wear, thermal wear, phase change wear and hydrodynamic wear.
Run-in wear is the wear of machinery under normal load, speed and lubrication conditions, this kind of wear is generally slow to develop and has little impact on the machining quality in the short term.
Hard particle wear is due to the parts themselves fallen abrasive particles or by the outside world into the machine tool hard particles, mixed into the processing area, subject to mechanical cutting or grinding, causing damage to the parts, which is more serious impact on the quality of processing.
Surface fatigue wear is machinery in the role of alternating load, produced a small crack or class point-like crater, thus causing damage to the parts. This type of wear is usually closely related to the pressure size, load characteristics, machine material, size and other factors.
Heat-like wear is parts in the friction process generated by the heat on the parts, so that the parts have tempering softening, scorching creasing and other phenomena. This type of wear usually occurs in the high-speed and high-pressure sliding friction, wear is more destructive, and accompanied by the nature of accidental wear.
Corrosion wear is a chemical effect, that is, chemical corrosion caused by wear. When the parts surface and acid, alkali, salt liquid or harmful gas contact, it will be chemical erosion, or parts surface and oxygen combined to generate easy to fall off the hard and brittle metal oxides and make parts wear.
Phase change wear is parts of long-term work at high temperatures, parts of the surface metal tissue grain heat becomes large, the grain boundary around the oxidation, resulting in small gaps, so that parts fragile, wear resistance decreased, resulting in parts wear.
