Blisk Machining
We machine blisks (integrally bladed rotors, or IBRs) from Inconel, titanium and stainless steel forgings on a simultaneous 5-axis horizontal machining center. Each one is programmed blade by blade in ESPRIT EDGE.
Short answer: Yes, JEP Manufacturing machines blisks. We use simultaneous 5-axis milling to cut the blades, hub and fillets out of a solid forging. We work in Inconel 718/625, Ti-6Al-4V and stainless steel, from single prototypes to production. Our shop is in Houston, Texas, and we ship nationwide.
What is a blisk?
A blisk (short for bladed disk) is a rotor where the airfoils and the disk are one solid part. It's also called an integrally bladed rotor (IBR). A conventional rotor slots separate blades into the disk with dovetail or fir-tree roots. A blisk is machined from a single forging. There are no roots to add weight and no joints to leak or fret, so the rotor is lighter and more efficient. Blisks are standard in modern jet engine compressors, and common in gas turbines, turbochargers and high-speed industrial compressors.
That one-piece design is what makes blisks hard to machine. Most of the forging is cut away, blade passages are deep and narrow, and the airfoils get thinner as you cut. A mistake on the last blade scraps the whole part.
| Blisk machining capability | |
|---|---|
| Process | Simultaneous 5-axis milling: roughing, semi-finishing, blade flank/point finishing, hub floor, fillets, edges |
| Machine | Kitamura HX500 horizontal machining center, 5-axis simultaneous |
| Work envelope | Ø31.5 in × 43.5 in high (part fit confirmed per model) |
| CAM | ESPRIT EDGE, impeller/blisk strategies |
| Materials | Inconel 718, Inconel 625, Ti-6Al-4V, 17-4 PH, 13-8, aluminum 7075/6061 |
| Starting stock | Customer-supplied or JEP-sourced forgings and bar, with mill certs |
| Quantities | Prototype, development, first article, production |
| Documentation | First article inspection, material traceability to heat lot, certificate of conformance |
| Industries | Aerospace, defense, power generation, oil & gas compression, turbochargers |
How we machine a blisk
1. Review the model and print
Before quoting, we check blade height-to-gap ratios, minimum fillet radii, edge requirements and tool reach. These decide whether a part can be machined well and what it will cost. If a feature will cause trouble, we tell you before you place the order.
2. Turn the blank
The forging is turned to its hub, bore and outer profile on a mill-turn. That gives the 5-axis operation true datums and a balanced, consistent starting blank.
3. Rough the blade passages
Each passage between blades is roughed with 5-axis toolpaths that keep a constant tool load. That limits heat and tool wear in Inconel and titanium, and leaves even stock for finishing.
4. Semi-finish and finish the airfoils
Blades are semi-finished, then finished with flank or point milling in an order that keeps thin airfoils supported for as long as possible. That controls chatter and deflection.
5. Hub, fillets and edges
The hub floor and blade-root fillets are finished with tapered ball and barrel tools. Leading and trailing edges are machined to the specified form.
6. Inspect and document
Critical dimensions are verified and recorded. You receive a first article report on the first part, material traceability back to the heat lot, and a certificate of conformance with every shipment.
Where blisk jobs go wrong — and how we prevent it
- Thin-blade chatter and deflection. We plan the stepdown sequence, tool engagement and finishing order so each blade stays as stiff as possible while it is being cut.
- Heat and tool wear in superalloys. We use conservative surface speeds, sharp carbide, high-pressure coolant and tool-life limits that come from experience in Inconel and titanium, not from a catalog.
- Tool reach in deep passages. Tool length, taper and holder clearance are checked in a full machine simulation before metal is cut.
- Blade-to-blade consistency. All blades are cut in one clamping on one machine with the same tools, so they match each other.
- Scrap risk on expensive forgings. Programs are verified in simulation, and the first part is proved out step by step before production runs.
What to send
- STEP (or IGES) model of the finished blisk
- Drawing with tolerances, surface finish and edge requirements
- Material spec and forging/blank details, or ask us to source it
- Quantity and required delivery date
- Inspection and documentation requirements, such as FAI and material certifications
We are ITAR compliant. Export-controlled drawing? Tell us first and we will arrange how to receive it. Please don't upload ITAR data through the web form.
Related: Bling machining · Impeller machining · 5-axis CNC machining · Materials
Frequently asked questions
What is a blisk?
A blisk (bladed disk), also called an integrally bladed rotor (IBR), is a compressor or turbine rotor where the blades and the disk are one solid piece. It is usually machined from a single forging, not assembled from separate blades with dovetail roots. Blisks are lighter and have fewer leak paths than bladed assemblies. They are used in jet engines, gas turbines, turbochargers and industrial compressors.
Can JEP Manufacturing machine blisks?
Yes. We machine blisks to customer prints and 3D models using simultaneous 5-axis milling on a Kitamura HX500 horizontal machining center, programmed with ESPRIT EDGE's impeller and blisk toolpath strategies. We work in Inconel 718 and 625, Ti-6Al-4V titanium, and 17-4 PH and 13-8 stainless steel.
What is the largest blisk you can machine?
The HX500 work envelope is Ø31.5 in × 43.5 in high. The usable size for a given blisk depends on blade height, tool reach and fixturing, so send the model and we will confirm fit before quoting.
What materials are blisks made from?
Compressor blisks are commonly titanium (Ti-6Al-4V) or stainless steel. Hot-section and high-temperature stages use nickel superalloys such as Inconel 718. Aluminum is used for low-temperature stages, test articles and prototypes. We machine all of these.
What do you need to quote a blisk?
A STEP model of the finished part, the drawing with tolerances and notes, material and forging or blank details (or whether we supply material), quantity, and any inspection or documentation requirements, such as first article inspection or material certifications.
Do you machine prototype blisks or only production?
Both. We machine single prototypes and development units, first articles, and repeat production. For repeat work, programs, fixtures and setup sheets are saved and reused for consistency.
Have a print or a STEP model?
Send it over. We review every RFQ by hand and include a lead time with every quote.