# Nonstandard Precision Machining# Turning processing What is the processing principle of the die-cast silencer cover?

• Acoustic principle: Utilize structures such as pipe cross-section mutations, acoustic impedance changes, or acoustic filters to cause sound waves to reflect, interfere, or filter during propagation, thereby reducing noise.

• Resistive sound attenuation: Use porous sound-absorbing materials, such as foam, fiber, etc., and fix them on the inner wall of the airflow channel. When sound waves pass through these materials, part of the sound energy is absorbed and converted into heat energy, thereby weakening the intensity of the sound waves.

• Resistance silencing: By changing the shape and size of the pipe, the propagation resistance of sound waves is increased, so that the sound waves are reflected and attenuated in the pipe to achieve the purpose of silencing.

• Combined silencing: Comprehensive use of resistance and resistance silencing principles, or combined with other silencing technologies, to obtain better silencing effects.

In actual processing, factors such as material selection, processing technology, and accuracy requirements also need to be considered to ensure the performance and quality of the silencer cover.