For fighter jets, the scroll compressor is a vital component of the engine. This device typically supplies a continuous, large volume of highly compressed air to the combustion chamber, ensuring the engine operates correctly. As precision components, both the scroll compressor and the exhaust turbine operate continuously at high speeds for extended periods. Consequently, high machining precision is essential for this type of power compressor. So, how is the machining precision of these critical parts guaranteed? In practice, these scroll compressors are cast individually using molds created personally by master craftsmen.
In the aviation industry, where component requirements are extremely stringent, engine production does not rely on fully automated robotic processes. To enhance manufacturing precision, producers often employ powder metallurgy to form components as single, integrated units; however, most parts of an aero-engine—including the scroll compressor—feature complex, irregular geometries. Once the firing process is complete, the part cannot be extracted without destroying the mold. Thus, the production rate of aero-engines is often constrained by the speed at which these molds can be manufactured.
Yet, even when high-precision, single-use molds establish a solid foundation for accuracy, that is merely the beginning. The components must undergo precise measurements to ensure that dimensional changes remain within limits, weight meets standards, and the center of gravity is correctly positioned. Finally, the parts undergo polishing to ensure they fit perfectly into their designated locations without any issues.