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Mechanical wear is the friction between the surface of parts produced. Parts of the surface even after machining, not absolutely flat, part surface contact with each other, uneven, easily embedded in each other. When the parts to movement, raised the metal particles have continued to fall off. When combined with the gap increases to a certain extent, part due to increased impact load, lubrication conditions, wear the destruction continues to increase.

Parts of the surface friction, due to minimal friction of hard abrasive inclusions in the surface between the part surface scraping and abrasions caused by a phenomenon known as abrasive wear. By scraping off the metal powder can be used as abrasive grinding mixture by adding the friction surface, a long time, so that destruction of parts of the surface. Abrasive abrasive wear depends on the strength of the size, shape and nature of the part surface mechanical properties. Severe abrasive wear, in a very short period of time to lose the ability to work with the pieces.

1 corrosion

Corrosion is the part in contact with the surrounding medium, the role of chemical and electrochemical reactions caused by the surface of the metal part composition and nature of change, so that part is damaged. Corrosion generally start from the part surface, and gradually to internal development.

Corrosion can be divided into two kinds of chemical corrosion and electrochemical corrosion. Metal parts and substances such as acid-base chemical reaction caused by direct damage to parts known as chemical corrosion. Impurities such as lubricants or lubricants containing acid is oxidized to produce organic acids. These acid-base material can corrode metal. Electrochemical corrosion of metal parts in the electrolyte under the influence of different types of local electrolysis between the metal caused by the phenomenon of metal corrosion.

2 metal parts of fatigue damage

Construction machinery parts, especially the working device and its powertrain, often subject to repeated alternating loads, when the alternating loads caused by the alternating stress cycles than the material of the wing fatigue limit, fatigue damage occurs , resulting parts breakage or flaking.