lavorazione cnc · 2021年7月27日 0

Perché le pale dei motori aeronautici sono progettate come strutture sciolte? 2021-07-17

Perché le pale dei motori aeronautici sono progettate come strutture sciolte?


I motori aerospaziali sono conosciuti come il fiore all’occhiello dell’industria moderna. La loro potenza di uscita è sorprendente. I motori aeronautici che pesano solo poche tonnellate possono spingere aerei passeggeri che pesano decine di tonnellate e centinaia di tonnellate. In generale, il costo di produzione dei motori aeronautici rappresenta circa il 30% del costo di produzione totale e l’importanza è evidente.

The internal structure of aero-engines is very precise and complex, and the connections between parts should be tightly connected. But when passing by the aircraft engine, a rattling sound can be heard from inside. Could it be that the fan blades inside the engine are loose? That’s right, it’s loose, but don’t be afraid, it was originally designed like this.

Perché le pale dei motori aeronautici sono progettate come strutture sciolte? 						 							2021-07-17
Why Are Aero Engine Blades Designed As Loose Structures

The aero engine completes the compression and expansion of the gas, and generates powerful power with the highest efficiency. The blade that drives the aircraft forward is a special part with a large number of complex shapes, high requirements, and difficult machining.

The curved configuration of aero-engine blades is extremely complex, which transmits considerable torque and extremely high combustion temperature. Therefore, the material of the blade is generally made of high-temperature resistant and high-strength materials. The initial material was a polycrystalline nickel-based superalloy. Later, a polycrystalline blade with oriented grain boundaries was made. The crystalline direction was consistent with the force direction, and the performance was improved a lot. Finally, it developed to the widespread use of titanium alloy materials. Integral blade machining technology.

As the load-cuscinetto component of the engine, the blades of these fans are not firmly fixed on the engine, but are stuck in the tongue and groove of the fan disc through the tenon. There is a gap between the tenon and the groove. When the fan rotates slowly, under the action of gravity, each blade will slide toward the axis when it is close to the twelve o’clock position, and when it is close to the six o’clock position, it will move towards The axis slides out in the opposite direction. As a result, the fan blades collided with each other in the process of slashing to and fro, making a rattling sound.

The mortise and tenon structure connecting the fan blades and the fan plate is called a “vertical tree” mortise, because it looks like a vertical tree and a fir tree, showing a toothed V-shaped tenon and a groove between the tenon and tenon. The obvious gap can facilitate the free sliding of the tenon within a certain range.

Perché le pale dei motori aeronautici sono progettate come strutture sciolte?

When the engine fan rotates rapidly and exceeds the critical speed, the rotating albero begins to approach its geometric center due to its elasticity, and then crosses the geometric center and approaches its imbalance. At this time, the direction of the centrifugal force received by the blade starts from the new rotating albero and passes through the position of the blade. The component along the tangential direction of the turbine disk points to the opposite direction to the unbalanced position, which makes the blades deviate in this direction, thereby re-adjusting the unbalanced position so that the center of gravity is close to its geometric center, thereby reducing vibration.

This process is dynamic, so the vibration of the fan at any high speed can be dynamically reduced, and the angle of the blades relative to the tangential direction of the turbine disk changes periodically, so the blades need to swing left and right.

In order to allow the blades to swing freely to a certain extent, the blades are not completely fixed on the turbine disk, but are left with gaps, and the shoulders cannot be completely close to the adjacent blades, also to allow the blades to swing. It is certain that not only the blades of the fan are loose, but the blades of the entire compressor are all loose.


Perché le pale dei motori aeronautici sono progettate come strutture sciolte? 						 							2021-07-17PTJ® offre una gamma completa di Custom Precision cnc lavorazione cina servizi.Certificato ISO 9001:2015 e AS-9100. Precisione rapida a 3, 4 e 5 assi Lavorazione CNC servizi tra cui fresatura, tornitura su specifiche del cliente,Capacità di parti lavorate in metallo e plastica con tolleranza +/-0.005 mm.I servizi secondari includono rettifica CNC e convenzionale, foratura,pressofusione,lamiera e stampigliatura.Fornire prototipi, cicli di produzione completi, supporto tecnico e ispezione completa.Serve il settore automobilisticoaerospaziale, stampo e apparecchio, illuminazione a led,medico,bicicletta e consumatore elettronica industrie. Consegna puntuale. Raccontaci un po’ del budget del tuo progetto e dei tempi di consegna previsti. Studieremo con te una strategia per fornire i servizi più convenienti per aiutarti a raggiungere il tuo obiettivo, benvenuto a contattarci ( [email protected] ) direttamente per il tuo nuovo progetto.