How does heat treatment affect the noise level of the DFY560 gear reducer?

The heat treatment process has a significant impact on the noise level of DFY560 gear reducer, as follows:

Affects the performance of gear materials

Hardness and wear resistance: Appropriate heat treatment, such as surface quenching, carburizing quenching, etc., can improve the hardness of the tooth surface, reduce wear and plastic deformation during meshing, and thus reduce noise caused by wear and plastic deformation. If the hardness of the tooth surface is insufficient after heat treatment, the gear is prone to wear during operation, leading to changes in tooth profile and resulting in unstable gear meshing and noise.

Internal stress: Improper heat treatment can cause internal stress in gears or fail to effectively eliminate residual stress generated during the machining process. These stresses can cause deformation during gear operation, affecting the meshing accuracy of the gears and generating noise. Through appropriate heat treatment processes such as normalizing and quenching, residual stress can be eliminated, grain size can be refined, microstructure can be improved, mechanical properties of steel can be enhanced, and noise caused by stress and microstructure problems can be reduced.

Resilience: Heat treatment processes can also affect the toughness of gear materials. If the toughness of the gear is insufficient, it is prone to fracture or tooth surface peeling when subjected to impact loads, which can disrupt the normal meshing of the gear and produce significant noise. On the contrary, by reasonable heat treatment, the gear core can maintain sufficient toughness, which can improve the impact resistance of the gear and reduce noise.

Causing gear deformation: The carburizing and quenching heat treatment methods used to obtain hard tooth surfaces can easily cause gear deformation if the process parameters are not properly controlled. Gear deformation can lead to increased tooth profile and pitch errors, resulting in unstable gear transmission, increased noise, and shortened gear lifespan.

Changing the acoustic vibration attenuation performance of materials: Different heat treatment methods have almost no effect on the elastic modulus of materials, so they have little effect on the natural frequency of gears, but will affect the acoustic vibration attenuation performance of materials. For example, the sound and vibration attenuation performance of gears decreases after quenching, which can increase gear noise by 3-4dB. Therefore, for gears with low requirements for strength and wear performance, quenching treatment is not necessary to avoid noise increase caused by the deterioration of sound and vibration attenuation performance.