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Hydraulic Purlin Machines: Features and Benefits
1. What the phrase usually buys
A hydraulic purlin machine in search ads is almost never a mill whose stands are driven by hydraulic motors. The host is still electric (chain, gearbox, or servo). “Hydraulic” on the RFQ usually means: hydraulic expand on the decoiler, hydraulic pre-punch, and/or hydraulic cut. Those are three purchase lines. Write them separately.
C vs Z vs C/Z interchange is a different fork — already covered. This page is only the hydraulic kit on those hosts.
2. Three hydraulic jobs on one line
| Job | What the oil does | What it does not do |
|---|---|---|
| Decoiler expand / press arm / car lift | Grip the eye, hold wraps, seat the coil | Does not set forming speed |
| Pre-punch / notch | Cylinder stroke through dies in the flat strip | Does not form the C or Z |
| Cutoff | Shear or twist-break the formed bar (or a flying carriage on other packages) | Does not replace a flying-saw motor when that variant is the one quoted |
The hydraulic-system wiki notes that decoiler packs are often independent so service on the reel does not kill the punch/cut pack. Catalog “few kW / ~20 MPa” decoiler packs are industry orientation, not a ZTRFM nameplate — use the OEM sheet for the machine you buy.
3. Why holes are punched in the flat
Structural C, Z and C/Z lines commonly punch connection holes before the stands. Production speed notes often already include punch/shear cadence. Punching after form fights a closed C and wrecks hole location when the section springs.
Multiple stations on one manifold need sequencing so pressure does not collapse mid-stroke. The CZ auto-changeover process sheet names three hydraulic pre-punch stations. The CUZ sheet names three stations with ellipse 14.3 × 25.4 mm (9/16 × 1 in). Those hole families are not interchangeable by HMI text.
4. Cut is a package, not a slogan
The purlin shear wiki lists stop-cut / hydraulic CTL, flying shear or flying saw, and twist-break. Compare speed only when punch method and shear type match. A flying-saw motor about 15 kW appears on some C/U references — that is a flying-saw package, not the CZ sheet’s “cut+punch 15 kW” tank, and not the fixed-C 5.5 kW stop shear.
5. Named packs (host kW ≠ punch kW)
| Build | Hydraulic items on that quotation | Electric host on that quotation |
|---|---|---|
| CZ auto-changeover | Dual-head decoiler 6 t/head (sheet also labels 12 t — two heads, not one 12 t mandrel); 3 hyd pre-punch; cut+punch power 15 kW; tank 300 L | Servo host 42 kW; high 32 / normal 12–18 m/min; 1–3.2 mm; 380 V/50 Hz |
| CUZ | 6 t hydraulic decoiler; 3 prepunch stations | Smart PC + servo (kW not copied from the CZ 42 kW row); 220 V/60 Hz |
| Fixed C 45×75 / 45×100 | Hydraulic stop cut 5.5 kW; 3 t manual decoiler on that quotation | 11 kW AC servo; ~20 m/min; 440 V/60 Hz |
| Automatic C80-300 wiki class | Hydraulic punching when the drawing needs holes; cut variant per package | Main ~15 kW; forming ~0–18 m/min; with punch/shear ~0–12 m/min |
Z Automatic baseline main ~18.5 kW stays on the Z page. It is not the motor for this page’s hydraulic punch or cut.
6. One tank or two
If punch and cut fire together, the pack must cover the peak or the PLC must sequence them. Undersize shows up as soft cuts and buckled ends. Fan-cooled stations appear on several named builds; that is cooling, not extra forming power.
Hydraulic expand on a 6 t head is still the decoiler. It does not make the mill a “hydraulic drive purlin machine.”
7. RFQ that names the hydraulics
- C only / Z only / C/Z / CUZ
- Decoiler: manual vs hydraulic expand vs dual-head; t per head
- Punch: number of stations, hole drawing, round vs ellipse vs slot
- Cut: stop hydraulic vs flying shear/saw vs twist-break; front vs post
- Whether decoiler oil is a separate pack
- Voltage / frequency (380 V/50 Hz, 220 V/60 Hz, 440 V/60 Hz are different named halls)
8. Buyer FAQ
Is a hydraulic purlin machine faster than a “normal” one?
Only if you compare matching punch and shear packages. Stop-cut cadence is not flying-saw cadence.
Does hydraulic punch replace a mechanical press?
On these lines the hydraulic stations are the usual flexible hole kit. Force still has to match thickness. It is not a 300 t guardrail punch copied onto a purlin.
Can I copy 15 kW from CZ cut+punch onto the fixed-C shear?
No. Fixed-C stop shear in this catalogue is 5.5 kW.
Is hydraulic decoiler the same as automatic decoiler?
Expand vs driven payoff — see the automatic-vs-manual decoiler page. Both can exist on one reel.
kW and voltages above are labeled to the named quotation or wiki class. Commercial terms come back on the offer.
References
- ZTRFM wiki: Hydraulic System (decoiler / punch / cutoff duties)
- ZTRFM wiki: Punching on Structural Purlin Lines; Stop-Cut vs Flying vs Twist-Break
- Process library: CZ auto-changeover; CUZ; Fixed-size C
- ZTRFM wiki: C vs Z (dedicated baselines — Z Automatic ~18.5 kW is the Z mill, not this page’s hydraulic auxiliary)