Corner codes are the small stamped angles that lock the corners of a rectangular duct joint, and a duct shop gets through them by the thousand. This line is built by a duct corner code production line manufacturer to produce them from coil rather than from pre-cut blanks: strip is unwound, leveled, indexed forward and stamped in one continuous cycle, and finished codes come off the press ready to pack and take to the bench.
Output averages 45 complete corner codes per minute. That pace matters because the parts are consumed on the assembly bench all day — running them in-house on an automatic duct corner code production line keeps the benches supplied without pulling an operator off rectangular duct fabrication work to stand at a press.
The line draws 9 kW in total, and it needs a level stretch of workshop floor rather than a building of its own.
Operation is deliberately plain. Coil goes on the rack, strip runs through the leveler, feed length and stamping cycle are set on the computer control system, and the machine forms each code in the mould set. The operator loads coils, checks the first parts and collects the finished codes while the press cycle runs on its own.
As a duct corner code production line manufacturer, Coorig builds this machine as one connected train rather than a set of separate units. The standard build is an electric feeding rack, a leveling machine, a powered feeding mechanism, a punch press, one set of moulds and a computer control system, arranged so the strip runs in a straight path from coil to press.
The feeding rack carries the coil and pays strip out under power, and that is what makes the cycle continuous — the operator changes coils instead of lifting blanks. From the rack the strip enters the leveling machine, where the rolls take out coil set and cross-bow so the material reaches the tool flat and stays flat through the stroke.
The punch press is the working heart of the line and the place where corner code stamping for rectangular HVAC duct assembly takes shape. It is a C-frame press with its own control cabinet standing at the side, and the mould set is mounted in the press bed. Strip is indexed into the tool in measured steps rather than by hand, and the press closes only after the feed has positioned the material.
Control sits in one place. The computer control system governs feed length and the stamping cycle, so the job is set at the start of a run from the panel and the line repeats it until the setting is changed.
Frames and guards are painted steel and the assembly shares a common base, which keeps the strip path aligned once the machine is level and anchored on your floor.
| Model | AC-12 |
|---|---|
| Order code | 3037 |
| Processing thickness | 0.9–1.2 mm |
| Output | 45 complete corner codes per minute (average) |
| Total power | 9 kW |
| Dimensions (L × W × H) | 5600 × 1800 × 2750 mm |
| Weight | 5500 kg |
| Coil handling | Electric feeding rack with powered pay-off |
| Leveling | Integrated leveling machine ahead of the feed |
| Stamping | Punch press with one set of moulds |
| Control | Computer control system for feed length and cycle |
| Standard configuration | Feeding rack, leveling machine, feeding mechanism, punch press, mould set, control system |
Corner codes are only useful if they match each other. Because the mould set and the feed length stay fixed through a run, the codes leaving the press are interchangeable — the fitter takes the next one out of the box without checking it against the last.
Two things protect that. The leveling machine flattens the strip before the tool sees it, so a coil with set or cross-bow does not turn into a short or bent part; and keeping the material within the gauge band the tool was set for means the formed code has the same shape and the same grip on every stroke.
At the bench that shows up as square duct ends and joints that close without extra work. Codes that vary in length or angle pull a joint out of square, and the fitter pays for it in adjustment time. Codes that repeat let the bench work at the pace the duct line sets.
Inspection is a bench habit rather than a laboratory procedure: a first-off part when a new coil goes on, a glance at the edges for the burrs that tell you a die is dulling, and finished codes packed clean and away from damp.
We cut the mould set to the profile your fitters assemble, so the part coming off the press is the part they already know how to use.
The mould set does the forming, so it is the first thing to treat as a wear part on this duct corner code machine. A dull punch and die will not stop the line — they start producing codes with burrs and slivers instead, which is why the edge of a finished part is worth a glance at the start of every coil.
Holding a second mould set is the simplest way to keep production running through tool maintenance: swap the set, send the worn one for sharpening, and the line keeps working instead of waiting on a toolroom. Because the profile has to match the codes your fitters assemble, confirm the spare-set option with us when you place the order.
Around the tool, the routine work is ordinary housekeeping. Feed rolls need to stay clean and gripping so the strip indexes the same length on every stroke; leveling rolls should be cleaned and reset whenever you change material; the control cabinet should stay closed and dust-free so the electronics run cool.
Lubrication and adjustment intervals are set out in the machine documentation — follow those rather than adding oil when something sounds dry. The press, the feed and the leveler each have their own points, and they take a few minutes on a planned stop rather than an unplanned one.
Tell us the strip you run and how many shifts a week the line works, and we will confirm the spares worth keeping on the shelf for your pattern of use — usually tooling and feed components rather than large assemblies.
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.
The machine is built for the light-gauge band shown in the specifications: standard light-gauge duct strip at the lower end and heavier gauge at the top, and the leveler is set to suit the material going through. If your strip falls outside that band, or you are unsure about the grade, send us a sample and we will tell you whether the line will run it.
45 complete corner codes per minute is the line's average output. What a full shift delivers depends on the code length you are running, the strip, and how often coils are changed, so plan against the average rather than a single peak minute. Work out your daily code consumption first, then compare it with the hours you actually intend to run the machine.
One operator is enough. They load coils onto the feeding rack, set the feed length and cycle, check a first-off part, and collect and pack finished codes. Everything between coil and finished part — unwinding, leveling, feeding and stamping — is handled by the automatic duct corner code production line itself, which is where the labour saving comes from.
Code length is a setting on the computer control system, so switching between lengths is a matter of entering the new figure. The corner profile is a different matter: it comes from the mould set, so a different code design needs a different set of moulds. Tell us which codes you assemble and we will confirm what the line needs.
Start from the bench rather than the machine. Count the rectangular duct joints your shop closes on a normal shift and how many codes each joint takes, then compare that total with what the line produces in the hours you actually run it, allowing for coil changes. Send us the joint count and the code length and we will work through the match with you before you commit to this line at that scale.
