Case background: GH4169 high-temperature alloy integral blade processing requirements
In order to improve the performance of new engines, an aircraft engine manufacturer needs to optimize the blade processing technology. The goal is to reduce the surface roughness of the blade from Ra 3.1μm to Ra 0.51μm, and at the same time increase the contour accuracy to 0.04mm to achieve a 4.5% increase in engine efficiency. The processing object is a GH4169 high-temperature alloy integral blade with a diameter of 238mm and a thin-walled structure with a chord-thickness ratio of more than 40:1, which is a typical difficult area of low-vibration milling processing technology.
Traditional processing pain points
Thin-wall structure processing chatter mark problem: Insufficient rigidity of the blade tip causes cutting vibration and produces obvious chatter marks;
Poor surface roughness (Ra 0.93μm): affects subsequent polishing efficiency and contour accuracy;
Blade position tolerance: Tool wear causes processing path deviation;
Unsmooth blade edge transition: Insufficient traditional cooling and lubrication, cutting heat accumulation causes material deformation.
MID Solutions: Three-in-one ultrasonic green machine tool technology
In response to the above difficulties, MID launched the industry's first multi-purpose ultrasonic green vertical five-axis linkage processing solution, integrating three core technologies:
1.Integrated ultrasonic processing technology
Reducing cutting force by 46% through high-frequency vibration to solve the problem of thin-walled structure processing chatter marks;
Adopting ultrasonic internal cooling heat shrink tool holder to increase tool rigidity by 30% and ensure the stability of high-precision blade processing path.
2.Supercritical CO2 cooling technology (-78℃)
Low temperature environment reduces cutting temperature by 42%, inhibits thermal deformation of GH4169 high-temperature alloy, and optimizes blade edge transition smoothness;
With internal cooling ring spray taper ball head milling cutter, precise heat dissipation and chip removal are achieved.
3.MQL micro-lubrication technology
Reducing friction coefficient by 31% through nano-level oil mist lubrication, improving the overall blade surface roughness optimization effect;
Internal cooling channel design extends tool life and reduces the frequency of downtime and tool change.
Machining effect comparison: from Ra 0.93μm to Ra 0.408μm
After applying the MID solution, the surface roughness of the blade is reduced by 56% to Ra 0.408μm, and the contour accuracy is stable within 0.04mm. At the same time, the high-precision blade processing method brings the following advantages:
Reduced chatter marks: The thin-walled area of the blade tip has fine lines and improved contour consistency;
Shortened polishing time: The surface quality is close to the final processing requirements, and the efficiency of the post-process is increased by 40%;
Cost optimization: The tool life is extended by 25%, and the comprehensive processing cost is reduced by 18%.
