Hydraulic Folding Machine

Product Overview

We are a hydraulic duct folding machine manufacturer, and this is the model we build for shops that form duct edges, returns and folded joints from stainless steel and heavier-gauge sheet.

The working principle is straightforward. A hydraulic clamp holds the blank along its full length while the bent beam turns to an angle the PLC holds to a set number. The fold lands where it was planned rather than where an operator's eye judged it, and the same setting repeats on the next part.

The frame is a steel plate welded structure, not a bolted assembly. That matters with stainless, which work-hardens as it bends and pushes back against the beam; any flex in the frame shows up as a curve along a long part. A welded frame and a heavy bed hold that load steady, which is why we recommend this machine for stainless steel duct folding for HVAC fabrication workshops rather than for light galvanized sheet alone.

Day to day, the operator lays a blank on the horizontal bed, enters the angle on the control panel and uses the foot pedal to clamp and fold, so both hands stay on the sheet for alignment. The orange clamping beam is easy to see against the work, and the panel sits at standing height.

Two working lengths are available, and they share the same hydraulic system and PLC angle control. The difference is how long a blank you can fold in one pass, which is set out further down.

Folding sits between blanking and assembly, so the machine usually stands near the shear or the plasma table, with clear floor at both ends of the bed for long sheets to overhang.

Key Features

• Full-length hydraulic clamping — hydraulic pressure holds the blank along the entire bed, so the sheet cannot creep while the beam turns and the fold line stays parallel to the edge.
• PLC folding-angle control with encoder feedback — the angle is entered on the panel and the encoder stops the beam at that position, which is what makes a batch of duct sides come out identical.
• Bent beam rotation from hem to open return — the same setting routine covers a closed hem, a right-angle return and a wider open profile, so one machine handles every fold a duct section needs.
• Steel plate welded structure — the frame and bed are welded steel plate rather than bolted sections, and that rigidity is what keeps a long fold straight when stainless pushes back.
• Foot pedal operation — clamping and folding run from the pedal, leaving both hands free to seat and align the sheet against the bed.
• Control panel at standing height — angle, clamp and beam movements are within reach without stooping, which counts over a full shift.
• Built for stainless steel duct folding for HVAC fabrication workshops — stainless is harder on a folder than galvanized work, with higher springback and more resistance through the bend, and the hydraulic clamp and welded frame are there for exactly that.
• Two working lengths, one control package — the shorter and longer beds are operated the same way, so the decision comes down to the longest blank you fold, not to a difference in control.

Main Technical Parameters

PLC Folding-Angle Control

On this hydraulic folding machine for HVAC ducts, the angle is a setting rather than a judgement call. The operator enters the target angle on the control panel, an encoder follows the bent beam as it turns, and the machine stops at the set position. The next part starts from the same number instead of from a mark scribed on a sample.

That changes how a batch runs. Once the angle for a duct side is set and checked against the first part, the rest of the run follows without the operator stopping to measure every fold. Rework drops, and a new operator can hold the same tolerance as an experienced one after a short briefing, which helps in shops where folding skill sits with one or two people.

Changing from one profile to another is a value change on the panel rather than a mechanical adjustment. Edge returns, hems and open folds all come off the same setting routine, and the angles for repeat jobs can be written down and dialled back in when that job returns.

The control also makes long parts more consistent. A long fold made by hand tends to open slightly at one end as the operator works along the sheet; with a hydraulic clamp holding the full length and the beam driven to a number, the angle stays even from one end to the other.

Both working lengths use the same control package, so choosing a bed length does not change how the machine is operated or how the angle is set.

Bed Length & Material Range

• 2 m bed — the usual choice when your longest fold line is a duct side of roughly 2 m or less. Shorter footprint, easier to place in a busy shop, and a lighter power draw than the long-bed model.
• 2.5 m bed — for panels that run to 2.4-2.5 m, so a duct side is folded in one piece instead of being spliced, and for folding two shorter parts side by side in the same pass.
• Measure the fold line, not the panel — a 2.5 m sheet carrying a 1.8 m fold needs the shorter bed; the number that decides the model is the longest straight fold you will actually make.
• Leave room at both ends — long blanks overhang the bed, so keep the machine clear of walls, racks and doorways along its full length.
• The clamp is full length — a fold near the end of the bed behaves like one in the middle; there is no softer zone at the edges.
• Thickness and material are not the same thing — galvanized sheet folds more easily than stainless at the same thickness, so if your work sits at the top of the range in stainless, tell us before the order is placed.
• When stainless steel duct folding for HVAC fabrication workshops is the main workload — take the longer bed if your duct sizes allow it. Splitting a 2.4 m side into two pieces costs time on every duct, not just once.
• Room to grow — if you expect longer duct panels as your order book changes, the longer bed leaves that option open from the start.

Applications

A hydraulic folding machine for HVAC ducts sits between blanking and assembly, and that position decides what it is asked to fold.

In rectangular duct fabrication the machine forms the edge returns and folded joints that give a section its stiffness, and it turns out side panels in whatever length the job needs. Fittings work — transitions, offsets, plenum boxes, access openings — uses the same machine with short blanks and frequent angle changes, which is where the PLC setting pays for itself.

Stainless work is the case the machine was designed around: kitchen extract, industrial exhaust and similar ductwork where the material fights back against hand folding and a mallet can mark the surface. Galvanized HVAC work runs on the same settings, hems and returns included.

MEP prefabrication shops use it to build duct sections off site and deliver them ready to hang, and general sheet metal work — flashings, capping, folded panels — fits the same bed when the duct shop is quiet.

Because the machine is floor-standing and needs no pit, it can be placed where the material already flows instead of where a foundation happens to exist.

Installation & First-Run Checks

1. Choose a level concrete floor area with clear space at both ends of the bed, and enough standing room for the operator to keep clear of the clamp line.
2. Move the machine on a pallet truck or forklift rated for its weight, lifting from the frame rather than from the bent beam or the foot pedal.
3. Set it down and check the frame is level front to back and side to side; shim where the slab falls away, because a sheet metal folding machine standing on an uneven floor folds a twist into every long part.
4. Check the hydraulic oil level and look over the hoses and fittings before the first start, and confirm the oil grade against the manual for your workshop temperature.
5. Connect the foot pedal and confirm the panel responds — clamp, release, beam up, beam down — before any sheet goes on the bed.
6. Test-fold a scrap blank in the thinnest material you will run, then one in the thickest, and check both angles with a square or protractor.
7. Fold one full-length blank and check the fold line stays parallel to the edge along the whole part; if it drifts, re-check the levelling before adjusting anything else.
8. Brief the operators on the sequence — blank fully seated, hands clear of the clamp line, pedal control — and write down the angle settings for your regular jobs.
9. If you want our team involved in commissioning, arrange it with your sales contact before the machine ships so the visit can be planned around your installation date.

Care & Safety

• Wipe the bed and clamp faces after every job — stainless work leaves fine metal dust behind, and it prints onto the next blank if the bed is not cleaned.
• Watch the hydraulic oil — check the level regularly and top up to the manual's specification; a machine that needs topping up every week is telling you something.
• Keep the beam pivots lubricated — follow the manual's lubrication points; dry pivots make the hydraulic system work harder for the same fold.
• Check the foot pedal cable — route it away from walkways and swarf, and replace it at the first sign of a frayed sheath or a sticky pedal.
• Stay inside the thickness rating — folding beyond the rated sheet thickness strains the beam and shows up as a bowed fold that no angle setting can correct.
• Keep hands clear of the clamp line — operate the clamp from the pedal and never hold a blank across the closing line.
• Re-check the angle against a sample — a monthly test fold checked with a square catches drift before it reaches a customer's duct.
• Do not use the bed as a bench — heavy parts dropped on it knock a levelled machine out of alignment.

Ordering & Delivery

1. Tell us what you fold: material grade, thickness range, longest blank and the angles you use most.
2. Tell us your monthly volume and how many hours a day the machine will run, so the model is matched to the duty rather than to a catalogue line.
3. Confirm your site voltage and phase; the electrical build is agreed with you before the order is released.
4. Choose the bed length, and we confirm the model and order code against your longest fold.
5. Packing, shipping terms, lead time and payment are confirmed by your sales contact for your destination and order size.
6. Ask about commissioning support and operator training for your country if you want our team involved at start-up.
7. Published dimensions, configuration and technical parameters describe the standard build and are for reference; the configuration on your order confirmation is the one we manufacture to.
8. As a hydraulic duct folding machine manufacturer, we would rather ask about your material twice than ship a bed that falls short of your longest blank. Send the details through the enquiry form and we will come back with a specification for your work.

Hydraulic vs. Pneumatic Folding

Workshop Layout & Relocation

Built to be re-sited. This hydraulic folding machine for HVAC ducts is floor-standing: no pit, no foundation bolts, nothing built into the building. The frame sits on a level concrete slab and is held by its own weight — so moving it when the shop is reorganised is a lifting job rather than a building job. If you lease the premises, expect to add a longer duct range later, or plan to run folding in a second bay, that freedom is worth knowing about before the order is placed.

Leave room around the bed. The footprint follows the bed length you choose. Beyond each end of the bed keep clear floor at least as long as the longest blank that will overhang there — a 2.5 m side panel needs that space on one side even on the short-bed machine. Leave a full standing position along the operator side with room to step back, and keep one long side clear for a pallet truck or forklift.

Plan the services, not just the footprint. The machine needs its electrical supply and a cable route to your panel that can be disconnected and re-made without cutting conduit out of a wall; if you rent the building, agree that route with the landlord at the start. Nothing else ties the machine to the building.

When the move happens. Lift from the frame only, with a forklift or crane rated well above the machine weight, and never from the bent beam, the control panel or the foot pedal. Secure the bent beam so it cannot swing, keep the pedal cable off the floor, and move the machine on timber bearers rather than dragging it across the slab.

First day in the new position. Re-level the frame front to back and side to side before anything else, because a frame standing on a slab that falls away folds a twist into every long part. Look over the hoses for chafe after the move, then test-fold a thin blank and a thick one and check both against a square before the shop goes back into production.

Keep the record with the machine. Store the manual and the written angle settings for your regular jobs with the machine, so a move or a shift change does not undo what you already worked out.

Scale & Supply Capability

Tianjin Coorig Technology Co., Ltd. has been building sheet metal and MEP prefabrication equipment since 2004, with a team of around 200 people working from our own factory in Tianjin, China. In more than 20 years we have supplied buyers in over 35 countries — processing plants, mechanical installation contractors and agents — and we look after export, documentation and shipping as a one-stop service. A database of 3,000+ qualified suppliers, in-house quality control and our automated manufacturing systems keep build quality and delivery predictable. Reference work includes the Beijing Olympic Games, Egypt CBD, Guangzhou Baiyun Airport and BYD's European Center.

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