1. Impact of Process Parameters on Quality
The machining outcome of a CNC centerless grinding machine depends on the synergy of multiple parameters, including:
Wheel Speed: Typically 30–50 m/s; excessive speed causes burns, while low speed reduces efficiency.
Regulating Wheel Angle: 1°–5° adjusts feed rate; a larger angle increases feed but worsens roughness.
Depth of Cut: Rough grinding: 0.02–0.1 mm; fine grinding: 0.005–0.02 mm.
2. Principles of Wheel Selection
Material Compatibility:
Ordinary steel: White alumina (WA) wheels.
Hard alloys: CBN or diamond wheels.
Grit Size:
Rough grinding: 46#–80# grit.
Fine grinding: 120#–240# grit, achieving surface roughness Ra ≤ 0.2 µm.
3. Critical Role of Coolant
Cooling: Prevents thermal deformation; synthetic coolants with extreme pressure additives are recommended.
Chip Removal: High-pressure flushing (0.5–1 MPa) prevents wheel clogging.
4. Parameter Optimization Methods
Orthogonal Experiments: L9(3^4) design to analyze parameter weights.
AI Predictive Models: Neural networks trained on historical data recommend optimal parameter sets.