Five-axis milling of closed and semi-open impellers in 6061, 7075 and 2024. Blade profiles held to ±0.005 mm, with balancing and 100% inspection before shipment.
Most impeller scrap is decided before the first cut. These are the four we see most often.
A blade modeled at 1.2 mm that measures 0.9 mm at the tip loses pressure ratio and shifts the operating point. Thin-wall deflection is the usual cause, and it is invisible in a CMM report that only checks a few points.
An impeller that passes dimensional inspection but vibrates at 12,000 rpm is scrap. Unbalanced mass comes from uneven stock removal on the hub and from blade-to-blade variation that a drawing tolerance never captures.
One wrong work offset and a closed impeller with integral shroud becomes a paperweight. You lose the blank, the roughing hours, and the slot in the schedule. Rework is rarely possible once the flow path is cut.
As-machined flanks at Ra 3.2 μm add friction loss inside the passage. The part still fits and still spins. It just moves less air per watt, and nobody notices until the unit is on a test bench.
Five-axis simultaneous milling removes the need to re-fixture the flow path.
Impeller geometry punishes repositioning. Every new fixture adds a datum shift, and a datum shift on a twisted blade shows up as wall thickness variation. We rough and finish the flow path on simultaneous five-axis centers so the hub, blades and shroud stay in one coordinate system.
Tool access is the other half. A 4,000 × 400 × 150 mm envelope and a Ø400 mm rotary table let us tilt the part instead of reaching around it. That means shorter tools, less chatter, and blade tips that finish at the programmed thickness.
7075-T6 gives the highest strength for high-tip-speed rotors. 6061-T6 machines cleaner and welds if you need a repair path. 2024 is the middle option when fatigue life matters more than peak strength. We stock all three, plus 5052, 5083, 6082 and ADC12 for cast-then-machined work.
Cutting aluminum fast is easy. Holding balance is not. We control stock removal around the hub so the finished part starts close to balanced, then check residual unbalance before the impeller leaves the shop. Material certificates travel with the part.
Pick by geometry and volume, not by habit.
| Case | Best process | Why |
|---|---|---|
| Open or semi-open rotor, low volume | Five-axis milling from solid | No tooling cost, geometry changes stay cheap |
| Closed impeller with integral shroud | Five-axis from solid or split-and-bond | One setup keeps the flow path aligned |
| Casting-like shape, 500+ pieces | Die casting plus finish machining | Lower piece cost, aluminum still machines clean |
| Prototype for flow testing | Rapid prototyping | Iterate blade angles before committing to production |
Machining is one step. These are the ones that usually sit next to it.
Simultaneous five-axis milling for blades, hubs and integral shrouds. 16 centers available.
Rotary work for hubs and shafts where one face needs indexed access. 12 mills.
Mill-turn centers for impellers on an integral shaft, so runout stays controlled.
Flow-path iterations in days, before you cut aluminum.
Anodizing, bead blasting and polishing to bring passage walls down to Ra 0.8–1.6 μm.
ADC12 bodies cast close to shape, then finish machined on the same datums.
| Item | Range | Notes |
|---|---|---|
| Tolerance | ±0.005 mm (±0.0002 in) | Held on blade thickness and hub bores |
| Surface finish | Ra 0.2–0.8 μm fine, Ra 0.8–1.6 μm standard | Passage walls usually specified at 0.8–1.6 μm |
| Max part size | 4,000 mm maximum processing size | Large envelopes on selected machines |
| Rotary capacity | Ø400 mm rotary table | Splitter blades and closed rotors |
| Inspection | 100% before shipment | Reports available on request |
| Lead time | Quote in 12 h, parts ship in 3–5 days | Production can start within 24 h |
Fifteen years of aluminum cutting, measured rather than described.
Three wholly-owned plants and 7,600 m² of floor space in Dongguan, plus a Singapore factory.
16 simultaneous five-axis centers, 12 four-axis mills, 27 three-axis machines and 16 mill-turn centers.
Blade thickness, hub bores and shroud gaps inspected against the drawing, not against a sample.
Raw material check, in-process monitoring and final inspection on every lot.
IATF 16949, ISO 13485 and ISO 27001 cover automotive, medical and information security work.
From one prototype to 10,000+ part runs on the same process.
Turbocharger and cooling rotors that survive thermal cycling without losing balance.
Lightweight rotors where wall thickness and balance are both flight-critical.
Open and closed impellers in small lots, with repeat runs that match the first article.
Passage walls finished to Ra 0.8–1.6 μm to keep friction loss low.
7075-T6 when tip speed and stress are high and blade sections are thin. 6061-T6 when you want easier machining, better corrosion behavior and a repair path. 2024 sits between them for fatigue-driven duty cycles.
We keep 6061, 6061-T6, 2024, 5052, 5083, 6063, 6082, 7075 and ADC12 in stock, so the choice is driven by the application rather than availability.
Yes, down to ±0.005 mm on blade thickness when the geometry allows. The limit is usually blade height to thickness ratio, not the machine.
If a blade is very tall and very thin, we will tell you during the DFM review and suggest a change to the rib or fillet instead of quoting a tolerance we cannot repeat.
Yes. The Ø400 mm rotary table and five-axis tilting let us reach the passage without splitting the part.
For very narrow passages we may recommend a split-and-bond design, which is a mechanical decision rather than a machining limitation.
We control stock removal around the hub during roughing so the part starts close to balanced, then check residual unbalance before shipment.
If your drawing specifies a balance grade, send it with the model and we will machine to that requirement.
Standard as-machined finish is Ra 1.6–3.2 μm. Impeller flow paths are normally specified at Ra 0.8–1.6 μm, and fine finishing can reach Ra 0.2–0.8 μm.
Bead blasting, tumbling and polishing are available if you want a specific wall condition rather than a number.
Quotation and a free DFM analysis come back within 12 hours. Production can start within 24 hours of approval, and parts ship in 3–5 days.
No minimum order quantity applies. One prototype and a 10,000-part run go through the same process.
Yes. Uploads are secure and confidential, and an NDA is available on request before you share any geometry.
We work under ISO 27001:2022 for information security, which covers how customer data is stored and handled.
Every part is inspected before shipment, covering raw material check, in-process monitoring and final inspection. Reports are available on request.
For impellers, the report typically covers blade thickness at defined stations, hub bore, shroud gap and residual unbalance.
Upload a STEP file and get a quote with DFM feedback within 12 hours. No minimum order quantity, 100% inspection before shipment.
12-hour quote100% inspectionNo MOQNDA on request
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Upload your 3D model or 2D drawing and get a quotation with a free DFM analysis. Maximum processing size 4,000 mm.
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