1. Processing characteristics of brass
materials:
excellent machinability (easy chip breaking, small tool wear).
low coefficient of friction (suitable for high speed machining).
common grades:
C36000 (free-cutting brass): Lead-containing, preferred machining material.
C26000 (shell brass): lead free, tool parameters need to be optimized.
2. Tool selection key
Tool Material:
Cemented Carbide (Class K): Universal choice, cost-effective.
diamond coated tools: used for super finishing (surface roughness Ra≤ 0.8 μm).
geometric parameters:
rake angle: 10 ° ~ 15 ° (balance sharpness and strength).
nose radius: 0.2~0.4mm (avoid burrs).
3. Optimization of process parameters
| parameters | recommend range | Description |
| spindle speed (S) | 800 to 1500 rpm(& phi;50mm workpiece) | speed is too high and easy to stick knife |
| feed speed (F) | 0.05~0.15 mm/rev | Finishing takes small value |
| depth of cut (ap) | Roughing 1~3mm, finishing 0.1~0.5mm | brass low plasticity, can be boldly cut deep |
4. Cutting fluid and lubrication
Dry Cutting:
Brass usually does not require cutting fluid (chips are dry and easy to clean).
special circumstances:
Micro lubrication (MQL) can be used to reduce thermal deformation during finishing.
5. Common problems and countermeasures
problem 1: surface burrs
reasons:tool wear or feed too fast.
Resolved:tool change, reduce feed or increase deburring process.
problem 2: size out of tolerance
reasons:clamp loose or thermal expansion (rare but still need to be checked).
Resolved:switch to hydraulic clamps to control ambient temperature.
6. Efficient processing techniques
Chip Breaking Control:
Use chip-splitting tool to avoid long chip winding.
multi knife synergy:
Rough turning tool (large cutting depth) + fine turning tool (high speed) combination to improve efficiency.
7. Industry Application Cases
Typical parts:
valve fittings (high finish of sealing surface required).
musical instrument parts (e. g. saxophone, no scratches required).
quality inspection:
Use pneumatic gauge to detect the accuracy of the inner hole and white light interferometer to measure the surface roughness.
Summary
brass turning: “sharp tool + moderate speed + dry cutting”. Mastering the above practical points can reduce the trial and error cost by more than 50%, especially suitable for mass production of precision parts such as medical and electronic parts.