Quartz Making Machine

Quartz Making Machine
Quartz Making Machine
Quartz Making Machine

Project Service

According to SBM's business coverage, we have established strong installation engineer teams and divided them into several parts according to the businesses, including building aggregate team, ore processing team and industrial milling team. Each team consists of young, middle-aged, and old engineers, fully satisfying business requirement and fulfilling talent cultivation objective.

Summary : Countermeasures for fatigue wear of Quartz Making Machine The process of fatigue wear of the Quartz Making Machine is the process of crack generation and expansion. According to the location of the crack, the mechanism of fatigue wear i…

Design Scheme

Countermeasures for fatigue wear of Quartz Making Machine

The process of fatigue wear of the Quartz Making Machine is the process of crack generation and expansion. According to the location of the crack, the mechanism of fatigue wear is as follows:

1. Rolling contact fatigue wear. Rolling bearings, transmission gears, etc. have pitting and falling off between the surfaces of the rolling friction pair, which are caused by rolling contact fatigue wear. It is characterized in that after a certain number of cyclic contact stresses, pitting or shedding occurs, leaving acne-like pits on the surface of the friction pair with a depth of 0.1-0.2 mm or less.

2, sliding contact fatigue wear. The two rolling contact objects have a large shear stress at 0.786 b below the surface (b is the half width of the planar contact area). The plastic deformation is severe at this point, and the repeated deformation under the cyclic load causes the material to be partially weakened, and cracks first appear there. Under the superposition of the shear stress caused by the sliding friction force and the shear stress caused by the normal load, the large shear stress is moved from the 0.786b to the surface to form rolling fatigue wear, and the depth of the peeling layer is generally 0.2-0.4 mm.

The countermeasure to reduce or eliminate the fatigue wear of the Quartz Making Machine is to control the factors that affect the crack generation and expansion. The main countermeasures are as follows:

1, material. The presence of inclusions in steel tends to cause stress concentration, and the edges of these inclusions are prone to cracks, which reduces the contact fatigue life of the material. The material state of the material, internal defects, etc. also have an important influence on the wear.

Generally, the crystal grains are fine and uniform, and the carbides are spherical and evenly distributed, which are all advantageous for improving the rolling contact fatigue life. After the bearing steel is treated, the more retained austenite and the coarser the needle-shaped martensite, the lower the residual compressive stress and the strength of the carburized layer, and the more likely the microcracks will occur. Under the same conditions of undissolved carbide state, when the mass fraction of carbon in martensite is about 0.4% to 0.5%, the strength and toughness of the material are better matched, and the contact fatigue life is high. For undissolved carbides, by appropriate heat treatment, it tends to be small, small, and uniform, avoiding the appearance of coarse or banded carbides, and is beneficial for eliminating fatigue cracks. When the hardness increases within a certain range, the contact fatigue resistance will increase. In addition, the hardness matching of the two contact rolling elements is also important.

2. The surface roughness of the lining. Appropriately reducing the surface roughness of the lining is an effective way to improve the fatigue wear resistance. The surface roughness requirements of the lining are related to the contact stress on the lining surface. Usually, the contact stress fire or the surface hardness of the lining is high. The surface roughness of the liner is low.

In addition, the stress state of the lining surface, the level of the matching precision, and the properties of the lubricating oil all affect the speed of fatigue wear. Generally, fatigue stress is exacerbated by excessive stress on the surface of the lining, too small or too large a matching gap, and corrosive substances generated by the lubricating oil during use.

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Auxiliary Facilities