What do you know about the jaw material of the jaw crusher?
Date：2019-10-16 13:13 Source：cementepcViews:
The upper part of the jaw plate of the jaw crusher is connected with the eccentric shaft, the lower part is supported by the thrust plate, while the fixed jaw plate is fixed on the frame.When the eccentric axis rotates, the moving jaw plate mainly bears the extrusion action of the material, while the fixed jaw plate mainly bears the sliding cutting action of the material.As a part with high breakage rate, the choice of jaw plate is related to the cost and benefit of the user.What do you know about the jaw material of the jaw crusher?
1. Jaw plate material of jaw crusher
1.1 high manganese steel
High manganese steel is the traditional material of jaw crusher jaw plate, has a good impact resistance load capacity, but because of the reason of jaw crusher structure, the opening Angle between moving and fixed jaw plate is too large, easy to cause abrasive sliding, because deformation hardening is not sufficient and make the jaw surface hardness is low, abrasive short-range cutting, jaw wear faster.
In order to improve the service life of jaw board, a variety of jaw board materials have been developed. For example, Cr, Mo, W, Ti, V, Nb and other elements have been added to modify high manganese steel, and high manganese steel has been dispersion strengthened to improve its initial hardness and yield strength.In addition, medium manganese steel, low alloy steel, high chromium cast iron and high manganese steel compound are also developed.
1.2 high chromium cast iron
Although high chromium cast iron has a high wear resistance, but its toughness is poor, so the use of high chromium cast iron as jaw crusher jaw plate is not necessarily good use effect.In recent years, the use of high chromium cast iron or bonding on the high manganese steel jaw plate, the composition of the compound jaw plate, the relative wear resistance up to more than 3 times, so that the service life of jaw crusher jaw plate significantly increased.This is also an effective way to improve the service life of the jaw plate, but its manufacturing process is more complex, so it is more difficult to manufacture.
1.3 medium carbon low alloy cast steel
Medium carbon and low alloy cast steel is also a kind of wear-resistant material widely used. Due to its high hardness (≥45HRC) and appropriate toughness (≥15J/cm ^ 2), it can resist the fatigue spalling caused by material cutting and repeated extrusion, thus showing good wear resistance.At the same time, medium carbon and low alloy cast steel can also adjust its hardness and toughness in a large range through the adjustment of its composition and heat treatment process, so as to meet the requirements of different working conditions of jaw crusher.The running test shows that the service life of the jaw plate of medium carbon and low alloy steel is more than 3 times longer than that of high manganese steel.
2. Recommendations for the selection of jaw plate quality of jaw crusher
To sum up, the selection of jaw plate quality of jaw crusher should ideally meet the requirements of high hardness and toughness, but the toughness and hardness of materials are often contradictory. Therefore, in the actual selection of materials, it is necessary to fully understand the working conditions and select the materials.
2.1 impact load is one of the important factors that should be considered in reasonable material selection.
The bigger the specification, the heavier the easy wear and tear parts, the more the fragmentation of the material, the greater the impact load.At this point, modified or dispersion reinforced high manganese steel can still be used as the object of material selection.
But for medium and small jaw crusher, its easy to wear the impact load is not very large, the use of high manganese steel, it is difficult to make it fully work hardening.In this condition, the choice of medium carbon low alloy steel or high chromium cast iron/low alloy steel composite material can obtain good technical and economic benefits.
2.2 the composition and hardness of materials are also factors that cannot be ignored in reasonable material selection.
Generally speaking, the material hardness is higher, it is easier to wear the hardness of a piece of material is also higher, so in the condition of meeting the toughness requirements, should choose high hardness material as far as possible.
2.3 wear mechanism of easily worn parts should also be considered in reasonable material selection.
If the main cutting wear, material selection should first consider the hardness;If plastic deformation wear or fatigue wear is the main, the material selection should first consider the plasticity and toughness.