The wear of crusher liner is mainly abrasive wear. Abrasive wear is a kind of wear caused by the migration or falling off of surface materials due to the interaction between hard protrusions or particles and material surface in the process of friction. There are mainly two types of abrasive wear: according to the number of workpiece surfaces involved in wear in the wear system, abrasive wear can be divided into two-body abrasive wear and three-body abrasive wear, and its schematic diagram is shown in Figure 1. The wear caused by the embedding of abrasive particles or surface micro convex parts fixed on the grinding object into the workpiece surface is called two-body abrasive wear (Fig. 1a); The three body abrasive wear (Fig. 1b) is that loose abrasive particles roll or slide freely between the two ground surfaces and wear the two surfaces at the same time. However, this classification method is too simple. Under the actual complex wear conditions, simple two-body and three-body abrasive wear are very rare, and often occur at the same time.
For the lining plate of cone crusher, the complex wear mechanism of the combination of two body and three body abrasive wear is between ore, crushing wall and milky white wall (dynamic fixed cone lining plate). Micro cutting wear mechanism and micro brittle fracture wear are the most important wear mechanisms.
(1) Micro cutting wear
Micro cutting wear is a kind of wear often seen, especially in fixed abrasive wear and chiseling wear. It is the main mechanism of material surface wear. As shown in Figure 2, the force of abrasive on the material surface can be divided into normal force and tangential force. The normal force makes the abrasive particles press into the surface, and the tangential force makes the abrasive move forward. When the shape and direction of the abrasive are appropriate, the abrasive particles cut on the surface like a tool and form chips, and then the chips leave the surface. Because the depth and width of this cutting are very small, and the amount of chip is also very small, it is called micro cutting. These cuts can be clearly observed under the microscope. They have the characteristics of machine tool cutting. One side of the cutting is smooth, the other side has sliding steps, and some have curl.
(2) Micro fracture wear
As shown in Figure 3, most materials will undergo plastic deformation due to the stress state of hydrostatic pressure due to the abrasive pressing into the material surface during wear. However, for some materials, especially brittle materials, brittle fracture mechanism may play a major role. When fracture occurs, the materials around the indentation will be worn and peeled off, and the wear degree is greater than that of plastic materials. The external conditions of indentation fracture of brittle materials depend on the load, the size and shape of abrasive particles, the hardness of abrasive particles, fracture toughness and surrounding environment; The internal conditions mainly depend on the hardness and initial impact of the material.
