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Press brake

Why is a press brake called a press brake?

Why not a sheet metal bender or metal?

Is it related to the old flywheel of the mechanical brake?

The flywheel has a brake, similar to a car, that allows me to stop the ram from moving before the plate or plate begins to form, or to slow down the speed of the ram during molding. The fresh brake is like a brake press. I had the honor of spending several years with one, and for many years I thought that was why the machine was called that, but I’m not sure if it’s right. This doesn’t sound very good, as the word “brake” was used to bend sheet metal long before the machines were powered. And a break in the press can’t be good because nothing is pieces or pieces. NC Press Brake machine


It have decided to do some research on this topic for many years. In addition, It have the answer and also a small history that I will share. Let’s start with how the sheet metal is formed and what tools are used to complete the task.

From T-stakes to Cornice Brakes

Before the machines arrived, if someone wanted to bend the sheet metal, they would attach a suitably large piece of sheet metal to a mold or 3D model in the desired shape. anvil; doll; or even in the shape of a bag filled with sand or lead shot.

Using a T-pole, a ballpoint pen hammer, a lead strap called a slapper, and tools called spoons, skilled tradesmen punch the sheet into the desired shape, such as a shield. on the chest for armor. It was a manual operation and is still practiced in many car repair shops and art shops. The first “brake” we know of was the ledge brake. It relies on a manually operated blade that forces the clamped piece of sheet metal to bend in a straight line. Over time, they became the machines we know today as leaf brakes, box and pan brakes, and folding machines.


Although these newer versions are fast, efficient, and beautiful in themselves, the beauty of the original machine is unmatched. Why did I say that? This is because modern machines are not hand-made from cast iron components assembled with fine craftsmanship and finished oak pieces. Flywheel brakes appeared about 100 years ago, in the early 1920s, on flywheel-driven engines. This was followed by various versions of hydromechanical and hydraulic press brakes in the 1970s and electric press brakes in 2000.

However, if it is a mechanical brake pedal like a modern electric brake, what can these machines be called brake? To answer this question, we must study some etymology.


The definition of a 15th century brake was a “crushing or punching tool.” Eventually, the term “brake” became synonymous with “machine,” derived from machines used to crush grain and vegetable fibers. So in their simplest form, the “pressure machine” and the “pressure brake” are identical. The pressure brake cannot “step on the brakes” to rotate, so why is it called the brake pedal? A brief history shows the answer in a few words. Photo courtesy of Getty Images.

Who puts the “press” in the press?

Where the term “brake” comes from, It already know what the press is? Of course, there are other definitions that have nothing to do with our topic today, such as journalism or publishing. Besides, where does the word “press” come from – describing the machines we know today?

In the 1300s, “press” was used as a noun that means “crush or multiply.” At the end of the 14th century, the “press” became a tool for cutting clothes or for obtaining juice from grapes and olives.

From this, the “press” evolved into a machine or mechanism that uses force by squeezing. In the manufacturer’s application, punches and dies may be called “presses” which force the sheet and cause it to bend.

Kneeling, braking

So here it is. The verb “to brake”, used in metal shops, comes from the Middle English verb, which means “to bend.” In modern use, the brake is a machine that rotates. Combine that with a modifier that describes what drives the machine, what tools are used to shape the workpiece, or what types of bends the machine makes, and you get our modern names for other sheet metal and sheet metal benders.

The cornice brake named after the ledge from which it can made) and its modern leaf brake hub use a blade or lead to bend movement. The box and pan brake, also called the finger brake, creates the types of bends needed to form boxes and pots by forming sheet metal around the split fingers at the top. Finally, in press brakes, the press (with stumps and dies) activates the brake (bends). As bending technology progresses, we add modifiers. We switched from manual press brakes to mechanical press brakes, hydromechanical press brakes, hydraulic press brakes and electric press brakes. However, whatever you call it, the brake pedal is simply a machine for crushing, squeezing, or – for our purposes – bending.

If someone wants to buy a press brake, sometimes they confuse a CNC press brake and an NC press brake. In fact, there are many differences between the two brake machines. Today we share some basic important tips on how to identify a CNC press brake and an NC press brake. We hope this helps you start your business. The torsion bar press brake will basically call “NC Press brake”. And the electrohydraulic type of press brake will  called “CNC Press brake”.



The design principle for both machines is different, the result will be different synchronous structures on both sides of the ram. The NC press brake uses torsion axes that connect both sides of the ram and forces the ram to move up and down simultaneously, in this way the NC press brake uses a mechanically forced synchronous method so that the parallelism of the ramp cannot be examined and adjusted on its own. . In a CNC press brake, two linear encoders are installed in the machine on both sides, and the CNC control unit can analyze the current state on both sides of the ram using feedback from the two linear encoders. If an error occurs, the controller makes adjustments using the proportional valve to maintain ram synchronization. The CNC control system, hydraulic system and linear coding include a closed loop control system.



The parallelism of the ram affects the accuracy of the workpiece. The synchronization of the NC press brake is mechanical and there is no real-time feedback error. And in addition, it cannot set itself and can cause low bending accuracy. In an NC press brake. There two rollers forced to move up and down on the torsion bar at the same time. If the part load is present for a long time. It will cause the torsion bar to deform. For a CNC press brake. The controller checks the ram synchronization via. It will the same proportional valve. And the linear encoder sends feedback to the controller error. bending accuracy. Speed ​​of work.

For the brake pedal, we always mention three speeds: Down speed, working speed and return speed.

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