Aerospace Part CNC Machining: The Key Lies in These 2 Details

 Aerospace Part CNC Machining: The Key Lies in These 2 Details The precision requirements for aerospace parts are the "strict benchmark" of manufacturing—an aero-engine blade factory scrapped an entire batch of parts due to a 0.02mm deviation in blade profile, losing over 3 million RMB; an airframe structural part manufacturer delayed the aircraft assembly cycle by 2 weeks due to unqualified hole coaxiality. Whether it’s the complex curves of titanium alloy turbine blades or multi-hole machining of aluminum alloy frames, the core pain point of aerospace part CNC machining is never just "meeting standards," but "stably meeting standards." Most precision issues stem from ignoring two key details: "dynamic precision control" and "material stress relief." Below are actionable solutions for aero-engines, airframe structures, and avionics brackets.

1. Dynamic Precision Control: Fix "In-Process Deviations" Instead of "Post-Processing Corrections"
Traditional CNC relies on "static calibration + post-inspection," but dynamic factors like spindle heating, tool wear, and cutting vibration cause precision "drift" during aerospace part machining—when machining a turbine disk, the spindle temperature rose by 8℃ after 1 hour of operation, increasing radial runout from 0.003mm to 0.008mm, exceeding the ±0.005mm tolerance. 

3 key steps are needed:
Real-time temperature compensation: Install temperature sensors on the spindle and guide rails, collect data every 10 seconds, and the system automatically compensates (0.0005mm compensation for 1℃ temperature rise). Use an oil cooler to control oil temperature at 20±2℃ to avoid thermal deformation;
Dual monitoring of tool wear: Adopt "cutting force + vibration sensors"—when machining aerospace stainless steel, if cutting force increases by 15% (e.g., 800N→920N) and vibration exceeds 0.15mm/s, the system alerts for tool replacement to prevent surface roughness exceeding Ra≤0.8μm;
Dynamic path optimization: For complex curves (e.g., blades), use CAM to generate "variable-step paths"—0.05mm step for blade tips (high curvature) and 0.1mm for blade roots (low curvature). Enable "look-ahead control" to reduce impact.
Case: After adoption, an aero-engine factory stabilized turbine blade profile deviation within ±0.01mm, increasing the pass rate from 82% to 99%.

2. Material Stress Relief: Avoid "Post-Processing Deformation" by Controlling Stability from the Source
Aerospace-grade Ti-6Al-4V titanium alloy and 7075-T6 aluminum alloy retain internal stress after rolling and forging—without relief before machining, parts rebound. An airframe beam shrank by 0.03mm in length 24 hours after machining, exceeding the ±0.02mm tolerance.

 2 steps are required:
Customized aging before machining: Use "low-temperature aging" for titanium alloy (250℃ for 4 hours) and "artificial + natural aging" for aluminum alloy (120℃ for 8 hours + 72 hours at room temperature), achieving over 90% stress relief. Use a stress meter to ensure stress ≤30MPa;
Stepwise cutting + symmetrical machining in-process: For thick-walled parts (e.g., 10-15mm brackets), cut in steps (1-2mm per pass); for symmetrical parts (e.g., double-hole flanges), use "symmetrical paths" to control hole coaxiality within 0.005mm.
Case: After optimization, an airframe part factory reduced 7075 aluminum alloy deformation from 0.03mm to 0.01mm, eliminating secondary correction and increasing efficiency by 20%.

Why These 2 Details Are Key?
Aerospace parts require "micron-level precision + long-term mechanical stability." Dynamic precision control intercepts in-process deviations in real time, while material stress relief eliminates deformation causes. Together, they stabilize the precision pass rate above 95%. No equipment replacement is needed—only adding sensors and optimizing parameters. One manufacturer reduced monthly scrap losses by 500,000 RMB and shortened delivery cycles by 15%.