Bronze CNC Machining
The classic bearing material — wear-resistant and self-lubricating.
Bronze — The Bearing Specialist
Bronze (copper-tin alloys) has been in use for millennia and remains indispensable in modern manufacturing. Its excellent sliding properties, high wear resistance, and good corrosion resistance make bronze the preferred material for plain bearings, bushings, and mechanical guide elements.
Bronze Grades Overview
| Type | Alloy | Property |
|---|---|---|
| Tin Bronze | CuSn12 (CC483K) | Classic bearing bronze, high wear resistance |
| Gun Metal | Rg7 (CuSn7ZnPb) | Valve material, pressure-tight |
| Aluminum Bronze | CuAl10Ni5Fe4 | Seawater resistant, highest strength |
| Phosphor Bronze | CuSn8 | Spring elements, contacts |
Machining and Special Characteristics
- Cutting speed: 80–200 m/min — depending on the alloy. Tin bronze slower, gun metal faster
- Tools: Uncoated or polished solid carbide. Sharp cutting edges required
- Chip form: Depending on alloy, continuous chips (tin bronze) or crumbly chips (gun metal)
- Coolant: Emulsion recommended, dry machining possible with gun metal
Pro tip: Gun metal (Rg7) machines similarly well to free-machining brass. Tin bronze (CuSn12) requires more care — the long continuous chips can cause issues with bar feeders.
Typical Applications
- Plain Bearings & Bushings — The classic. Bronze bearings are self-lubricating and wear-resistant
- Valves & Fittings — Gun metal for drinking water, steam, hydraulics
- Shipbuilding — Propellers, shaft seals (aluminum bronze)
- Mechanical Engineering — Worm wheels, lead screw nuts, guide bushings
Frequently asked Questions
Why is bronze used for plain bearings?
Bronze has natural sliding properties — the tin phase acts as a solid lubricant. Bronze bearings can still function briefly even under inadequate lubrication without seizing. Bronze is also insensitive to dirt.
What is the difference between bronze and brass?
Bronze = copper + tin (primary alloying element). Brass = copper + zinc. Bronze is harder, more wear-resistant, and has better sliding properties. Brass is easier to machine and less expensive.
Is bronze seawater resistant?
Yes — especially aluminum bronze (CuAl10Ni5Fe4) is excellently seawater resistant and is used in marine applications for propellers, pump housings, and valves.
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