Achieving an excellent surface finish on stainless steel during machining requires careful attention to tooling, parameters, and techniques. Today, engineer would like to share a comprehensive guide to optimize your machining process:
- Tool Selection & Geometry
- Cutting Tools
Carbide tools (Grade K or S for stainless) with sharp edges
Ceramic or CBN tools for high-speed finishing
Coated tools (TiAlN, AlCrN) to reduce built-up edge (BUE)
- Tool Geometry
Positive rake angles (5-15°) for better shearing action
Sharp cutting edges to minimize work hardening
Large relief angles to reduce rubbing
- Machining Parameters Optimization
Parameter Recommended Setting
Cutting Speed 30-60 m/min (finishing)
Feed Rate 0.05-0.15 mm/rev
Depth of Cut 0.1-0.5 mm (finish pass)
Coolant High-pressure, water-soluble
Key Tips:
Higher speeds with lighter cuts produce better finishes
Climb milling produces better surface finish than conventional milling
Avoid dwell times to prevent work hardening
- Workholding & Rigidity
Secure clamping to minimize vibrations
Use soft jaws to prevent part marking
Dampening systems for slender parts
- Coolant & Lubrication Strategies
High-pressure coolant (70-100 bar) to control heat and chip evacuation
Oil-based coolants for better lubrication in tough alloys
Mist cooling for light finishing operations
- Special Techniques for Superior Finishes
- Vibration Damping
Tuned mass dampers for long tools
Anti-vibration tool holders
High-Speed Machining (HSM)
Spindle speeds > 10,000 RPM with light radial engagement
Produces surface finishes to Ra 0.4 μm or better
- Trochoidal Milling
Constant tool engagement reduces chatter
Especially effective for deep pockets
- Post-Machining Treatments
Light abrasive flow machining for final edge refinement
Electropolishing for micron-level smoothing
Passivation to restore corrosion resistance
For more information, you are welcome to talk to us.
