How Edge and Surface Quality Determine CNC Parts Success?

When standard as-machined quality falls short of high-end requirements, FRIMA delivers Ra 0.02μm to Ra 1.6μm high-precision finishes via systematic process optimization and secondary operations:

1. Custom High-End Tooling: German imported carbide and CBN (Cubic Boron Nitride) tools optimize rake angles, relief angles, and nose radii for different materials. R0.8mm nose radius tools boost surface finish by 50% without sacrificing efficiency.

2. High-Pressure Through-Coolant System: All machining centers feature 70bar high-pressure cooling with synthetic cutting fluid, precisely cooling cutting zones and flushing chips to eliminate built-up edge—achieving Ra 1.6μm as-machined finish.

3. Precision Grinding & Lapping: For Ra ≤0.8μm requirements, high-precision surface grinders, centerless grinders, and lapping machines remove micro-defects via multi-pass ultra-light cuts, consistently delivering Ra 0.1μm ultra-smooth surfaces.

4. Full-Process Environmental Control: High-finish workshops maintain constant temperature and humidity (±1℃ fluctuation) to prevent thermal deformation affecting precision and surface quality.

FRIMA Benchmark Case: A European new energy vehicle Tier 1 supplier required Ra 0.4μm surface finish and ≤0.005mm concentricity for drive system precision couplings. FRIMA’s team engineered a process flow: Rough Turning → Semi-Finish Turning → CBN Finish Turning → Centerless Grinding → Superfinishing. Final parts achieved Ra 0.32–0.38μm and ≤0.003mm concentricity, boosting motor transmission efficiency by 2.3% and reducing defect rates from 8% to <0.3%. Annual supply now reaches 500,000 pieces.