Main Failure Forms Of Lining Board Of Ball Mill

Abrasive wear is seldom caused by a kind of wear mechanism. When lining plate is working under the condition of abrasive wear, its failure process is often very complex:

 

1, wear failure

 

Wear failure is the main failure form of lining plate. Abrasive wear is a complex system process. Under the condition of abrasive wear, two mechanisms of plastic removal and fracture are mainly caused by wear

 

The removal mechanism of plastic deformation caused by the material when contact and abrasive materials, not only to cut materials, will also push the material on both sides, which makes the material by plastic deformation, while the material near the trench is also affected by large deformation. Low hardness abrasive will make the surface shallow scratches however, the high hardness of the abrasive material is formed on the surface of the cutting groove. Scratches and cutting groove metal material was removed to form the debris and loss. In most cases, the plastic metal material in the trench, piled up on both sides of scratches and cutting groove, and finally the formation of furrow. Furrows produce plastic ridge. May the role of material when subjected to later time .It will flatten the accumulated material so that repeated plastic changes will cause the material to eventually peel off and form debris

 

The removal of material caused by the fracture mechanism of abrasive in the normal force under the action of pressure into the surface of the material, if the indentation depth is greater than the critical depth of material fracture occurs when the work piece will be caused by the material removal mechanism of fracture for brittle material fracture mechanism dominates, fracture of brittle materials, the external condition depends on the magnitude of load, the hardness and fracture toughness of the internal condition depends on the material.

 

2, uplift deformation

 

Liner in the use process, the impact of friction material makes the grinding ball and lining board surface to generate heat, and the work surface to the inner surface has a certain temperature, and the temperature of clinker production sometimes can be as high as 100 degrees Celsius, increases the liner temperature, which causes the liner inside and outside expansion and have a different stress. Especially the thermal deformation of high manganese steel is more serious than ordinary steel. If the stress is greater than the yield strength of the material, will be raised to the ball mill lining plate center and stress release. The working surface than the surface of the plate lining expansion effect, resulting in deformation of the bulge deformation. There are high manganese steel liner use in a small ball, because the lack of working hardening will cause serious deformation, and it is difficult to remove or even break the solid bolts of the lining board, thus causing serious accidents

 

3, in the case of wet grinding material, and a certain pH value of material contact, will inevitably produce corrosion. Corrosion and abrasion interaction, will accelerate the loss of material. In the wet mine lining corrosion, the common form of the pitting corrosion, crevice corrosion and corrosion. The general cell strain differences in wet grinding conditions under the consumption of steel 40%~90% is caused by corrosion. The synergy of corrosion and wear, mechanical properties of the material surface weakening, accelerated material corrosion and wear.

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