The transmission process of gears and gearboxes is a complex movement process. The problems encountered in the production of wire and bar mills are: noise, vibration, impact, broken teeth, tooth surface pitting, etc. This reflects the gears. There are two basic aspects to the evaluation of a drive train.
The first aspect is gears. High-load rolling mill gears are generally mainly tooth surface damage such as tooth surface wear, pitting, spalling and tooth cracks.
The second aspect is the box. Due to the large transmission load, the box support sometimes appears to be offset, skewed or sunken, so that the box aperture is seriously misaligned.
The above two aspects are the basic ideas when designing hardened gears.
A few basic concepts:
l) Surface hardness: The hardness of an aluminum alloy ladder measured directly on the surface.
2) Core hardness: the hardness obtained at the middle section of the tooth width of the gear after finishing, at the intersection of the gear center line and the root circle.
3) Hardness: There is a certain relationship between material strength and hardness. The surface hardness of Jiangsu vacuum pump is an important basis for gear bearing capacity. Core hardness is an important factor affecting gear bending strength and impact strength.
4) Relationship between contact strength and bending strength Contact strength: Contact stress occurs on the tooth surface. Pitting corrosion is caused by the Hertz stress of the gear mesh exceeding the allowable value, and the Hertz stress is proportional to the square root of the action load of the gear teeth.
Bending strength: It is a measure of the bending stress of the toothed cantilever beam. The bending stress is directly proportional to the applied load on the gear teeth. The maximum bending stress occurs at the root of the tooth, and the dangerous section is at the root radius transition.
The purpose of the contact strength calculation is that the gear teeth do not undergo destructive pitting within the design life of the rated load.
The purpose of the bending strength calculation is that the gear teeth do not break or fail within the design life of the rated load.
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