CNC Bending Phosphor Bronze is a core capability at VT machining. We combine controlled forming with material-aware setup for Phosphor Bronze — an alloy that is springy, wear and corrosion resistant — to produce parts that meet your specification first time.
Process Data for CNC Bending Phosphor Bronze
| Minimum inside bend radius | ~2 × t (across the grain) |
|---|---|
| Press force, 2 mm sheet, V16 die | ~23 t per metre |
| Typical springback at 90° | 2-4° |
| Angle tolerance | ±0.5° (CNC back-gauge, angle measurement on first part) |
Shown for C510 Phosphor Bronze, the most common Phosphor Bronze grade we see for CNC Bending. Typical values for C510 Phosphor Bronze, Spring temper; confirmed on the first part.
CNC Bending Capability for Phosphor Bronze
- Angle accuracy ±0.5°
- Back-gauge positioning
- Bend allowance control
- Multi-bend sequencing
Phosphor Bronze Material Data
| Density | 8.86 g/cm³ |
|---|---|
| Tensile strength | 325–965 MPa |
| Yield strength (0.2%) | 140–550 MPa |
| Hardness | 60–200 HV |
| Melting point | 975–1060 °C |
| Thermal conductivity | 69 W/m·K |
| Thermal expansion | 17.8 ×10⁻⁶/K |
| Electrical conductivity | 15% |
| Machinability (C36000 = 100%) | 20% |
| Grades we run | C51000, C51900, C52100, C54400 free-cutting |
Published typical values for C51000. Other grades in the family differ — the certificate supplied with your order carries the actual heat-lot figures.
Spring temper is destroyed by heat. Contacts and spring fingers are etched or wire-EDM cut, never laser cut.
How CNC Bending Phosphor Bronze Works
The Phosphor Bronze blank is bent or formed against tooling under CNC-controlled ram travel and back-gauge positioning. Bend allowance and springback are compensated in the program so finished angles hit the print.
Every job begins from your CAD model or 2D drawing. Fixturing and tool paths are planned so the most critical dimensions are produced in the most rigid, repeatable setup. Critical dimensions are checked on the first part and monitored through the run.
Achievable Tolerances for CNC Bending Phosphor Bronze
| Feature | Standard | Precision |
|---|---|---|
| Bend angle | ±1.0° | ±0.5° |
| Flange length | ±0.30 mm | ±0.15 mm |
| Hole-to-bend distance | ±0.30 mm | ±0.15 mm |
| Minimum inside radius | 1.0 × thickness | 0.8 × thickness |
| Minimum flange height | 4 × thickness + radius | 3 × thickness + radius |
| Bend-to-bend spacing | ±0.30 mm | ±0.15 mm |
| Sheet thickness range | 0.5–8.0 mm | 0.5–4.0 mm |
Standard is what a normal quotation assumes. Precision is available on nominated features and is priced separately, because it needs extra setups, in-process gauging and CMM verification. Call out only the features that need it — blanket-tightening a drawing is the single most common reason a quote comes back expensive.
Design Tips for CNC Bending Phosphor Bronze
A few design choices make a real difference to cost and quality. Consistent bend radii, adequate flange lengths and grain-direction awareness reduce cracking and springback in formed Phosphor Bronze. If you send your model early, we will return practical DFM feedback before you commit to production.
Working with Phosphor Bronze
Phosphor Bronze offers a useful combination of properties: it is springy, wear and corrosion resistant. Those characteristics shape how we approach forming — from tool and parameter selection to work-holding and coolant.
If your application is sensitive to alloy condition, we agree the specification in writing and document it. Stock is sourced from reputable suppliers so what you order is what you receive.
CNC Bending Tolerances & Surface Finish
Formed Phosphor Bronze holds bend angles to about ±0.5° and consistent flange dimensions, with bend allowance compensated for the material and thickness.
Final tolerances are governed by the material's behaviour, wall thickness and overall stiffness. We give honest DFM feedback if a callout would be costly or better achieved another way.
Applications of CNC Bending Phosphor Bronze
CNC Bending of Phosphor Bronze supports parts across aerospace, medical, automotive, electronics, semiconductor, energy and general industrial sectors. We scale from one-off prototypes to ongoing production while holding the same quality.
Typical Phosphor Bronze Parts for CNC Bending
Illustrative examples of CNC Bending Phosphor Bronze parts and the callouts that usually drive the process plan. They show the kind of work that fits this process; they are not specific customer orders.
Radiused cover
- Material
- Phosphor Bronze
- Size
- R150 × 500 mm
- Key callouts
- Radius ±1 mm, no tool marks
- Batch
- 200 pcs
Bumped in 14 small steps rather than rolled, because the batch does not justify a roll set.
Mounting bracket
- Material
- Phosphor Bronze
- Size
- 120 × 60 mm, 2 bends
- Key callouts
- Angle ±0.5°, hole-to-bend ±0.15 mm
- Batch
- 3,000 pcs
Holes placed at least 2.5 × thickness from the bend line so they do not distort.
Sheet-metal enclosure
- Material
- Phosphor Bronze
- Size
- 300 × 200 × 120 mm
- Key callouts
- Bend angle ±0.5°, diagonal ±0.5 mm
- Batch
- 400 pcs
Bend sequence chosen so no flange collides with the tool on the last hit.
Finishing Options for Phosphor Bronze
| Finish | Thickness / effect | Why it gets specified |
|---|---|---|
| Deburr / edge break | 0.05–0.3 mm | All parts unless the drawing says otherwise |
| Bead blast | Ra 1.6–3.2 µm | Uniform matt finish, hides tool marks |
| Laser marking | — | Part number, lot code, data matrix |
No drawing yet? Build one in the browser.
Set the metal, dimensions and features, watch the 3D model update as you type, then switch to the 2D sheet to add dimensions and tolerances. Download it or send it straight to us with your RFQ.
What We Need to Quote CNC Bending Phosphor Bronze
- GeometrySTEP or IGES for the 3D model, plus a PDF drawing if you have tolerance callouts. A dimensioned sketch is enough to start.
- MaterialThe exact Phosphor Bronze grade and condition — temper, heat-treat state or hardness. If you are not sure, tell us the function and we will suggest one.
- QuantityPrototype count and the expected annual volume. Both change how the part is made and therefore what it costs.
- TolerancesWhich features are critical. Everything else runs to our standard tolerance, which is what keeps the price sensible.
- FinishSurface treatment, cosmetic requirements, and any faces that must be masked.
- DocumentsWhether you need a material certificate, dimensional report, FAIR or PPAP with the shipment.
Missing something from the list is not a problem — send what you have. We will come back with the specific questions rather than a generic form.
Other Metals for CNC Bending
Other Processes for Phosphor Bronze
Send the drawing, the Phosphor Bronze grade and the quantity. You get pricing, lead time and any DFM notes back — usually within one business day.
Request a QuoteFrequently Asked Questions
How clean are the edges produced by CNC Bending on Phosphor Bronze?
Machined Phosphor Bronze edges are clean and to specification; edge-break or deburring is added when your drawing calls for it.
Does CNC Bending Phosphor Bronze require dedicated tooling?
Most Phosphor Bronze forming work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.
What surface finish is achievable on Phosphor Bronze with CNC Bending?
Surface finish on Phosphor Bronze is controlled to your specification; we confirm the achievable Ra against your callout.
Can VT machining make custom Phosphor Bronze parts to my drawing?
Yes. Phosphor Bronze forming is made to order from your CAD/2D drawing. Share your geometry, material grade, tolerance and quantity and we will confirm feasibility, lead time and pricing.
Why is Phosphor Bronze a good choice for CNC Bending?
Phosphor Bronze is springy, wear and corrosion resistant, which makes it well suited to CNC Bending. We tune the process to the alloy so the finished Phosphor Bronze forming part meets your dimensional and functional requirements.
Which industries use CNC Bending Phosphor Bronze parts?
CNC Bending Phosphor Bronze parts are used across aerospace, medical, automotive, electronics, semiconductor and general industrial sectors — anywhere precise Phosphor Bronze components are required.