The failure mechanism of the jaw plate mill
It is visible through the jaw plate mill, jaw crusher teeth plate wear belongs to a chisel wear. The jaw plate material is commonly used in water toughening treatment ZCMn13 high manganese steel. The scanning electron microscope to observe the grinding of the jaw plate can be seen that the surface of the jaw plate is squeezed into the concave and convex portions of the material, then be abrasive pushed to the formation of the pressure of the tongue grinding surface grinding surface can be seen a lot of grinding sharp corners caused by short-range sliding wear scar, and can see the surface of the jaw plate micro-cracks. Jaw plate wear, mainly due to the abrasive relative jaw plate of short-range sliding the chisel to cut the metal caused by debris and abrasive repeated extrusion deformation caused by the jaw plate material repeatedly, leading to metal materials fatigue off. Wear failure process is: ① material is repeatedly squeezed the chisel tooth plate, the formation of micro cracks in the surface of the jaw plate area, or in a prominent part of the roots of the extruding metal, this micro crack continues to expand to a connected, resulting in the shedding of the surface of metallic materials, formation of wear debris; ② material repeatedly squeeze the jaw plate metal materials by local fracturing or reveal, rupture or reveal part of the formation of wear debris off with the extrusion of impact materials. The ③ materials relative jaw plate of short-range sliding the chisel to cut the tooth plate formation of wear debris.
Material selection of the jaw plate
Affect the jaw plate wear, hardness, toughness and wear-resistant materials. ① materials, hard materials extrusion shallow depth, small deformation, the material is also a small chisel to cut the amount of short-range sliding of the material; good ② toughness, ability to resist fracture, and to eliminate the brittle fracture process of extrusion impact to improve the anti-fatigue deformation cracking. The two factors sometimes are contradictory, how to match is a very difficult subject.
Different size specifications of the jaw crusher, feed size, sharpness (shape), extrusion of the tooth plate, the force of impact. Large and medium-sized specifications jaw crusher squeeze pressure, should also be considered by the impact of the impact and bending stresses in addition to considering the resistance of the material extrusion pressure and anti-sliding cutting. Large jaw crusher teeth plate is usually to adopt ZCMn13Cr2 modified high manganese steel. The high hardness of the material to resist the squeeze jaw plate material should be selected, micro chisel failure, and also have sufficient toughness to resist chisel impact fatigue failure. Be improved from both the structure of the jaw plate, in order to reduce the relative sliding of the materials and jaw plate, which is not only beneficial to improve productivity, but also beneficial to improve the life of the material; for our country, small jaw crusher, jaw plate The material is mainly high-manganese steel, very few factories producing low-alloy cast iron jaw pull. Due to the low toughness of the low alloy cast iron, during the use it is prone to fracture. Use in the manufacture of high-manganese steel, small jaw plate, in the fork due to the impact force is too small, the hardening is not obvious, its excellent wear resistance can play, and the jaw plate life is very short, usually for 200-400 h. The annual consumption is of a large number. Therefore, looking for new materials to improve its service life and reduce material consumption has received special attention.
Jaw crushers : http://www.ore-machine.com/jaw-crusher.html
Raw material mill : http://www.china-crusher.com/ball-mill5.html
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