4 Roll Bending Machine

What is a 4 roll bending machine?

The four-roll bending machines have over the 3-roll bending machines is simplicity.

Four-roll bending Machines produce the fastest and most accurate bends. It has fixed-position top rolls and two offset, or lateral, rolls, one on each side, and has an additional roller underneath the top roll, which constantly pinches the plate during rolling, and can prebend both workpiece (plate or profile) ends without removal.

Read More: Plate Rolling Machine – 6 Types, How To Choosing?

4 roll plate bending machine

Usability is a big reason why this is the case. 4-roll benders are better suited to have CNC controls, since the material is held between two pinch rolls and the position can be controlled. They help operators comfortably oversee production runs, as a computer monitors accuracy and throughput volume.

As well as advanced controls, fabricators use 4-roll bending machines for:

• Large material. Like 3-roll versions, these bending machines can handle plate thicknesses from about half an inch to four inches, depending on the model.
• High production runs. With automated rolling centres, many 4-roll benders reduce the time it takes to run basic applications. Short cycle times create opportunities for larger throughputs.
• Accuracy. CNC controls will improve accuracy. Your shop can rely on a 4-roll bender for applications that require a wide variety of shapes.

Type Of 4 Roll Bending Machine

BIT offers three types of 4-roll bending machines: PBH 4 roll profile bending machine, PBR 4 roll plate rolling machine, and the PBA 4 roll aluminum bending machine.

It should be pointed out that the working principle of the PBA 4 roll aluminum bending machine is different from the previous two.

Read More: Best Buyer’s Guide for 4 Roll Bending Machine

Work principle of 4-roll bending machine

The metal workpiece is held securely in place between the top and bottom rolls, while the side rolls move vertically to create the bend. The bottom roll moves up to hold the metal profile or plate surface securely against the top roll while the side roll is raised to form an accurate prebend, minimizing the flat zone on the workpiece edge. 4 roll bending machine workpieces are loaded horizontally at the feed level for pre-bending, which allows the use of horizontal motorized roller tables to help feed the workpiece.

The side rolls are positioned to the right and left of the bottom roll and are on their own axes. The independent axis of each roll helps make a perfect bend. The so-called “back” side roll (at the far side of the feeding point) also functions as a back gauge to square the plate for proper alignment. This eliminates the need for someone to assist the operator.

The plate is kept square without slipping during both pre-bending and rolling because of the constant secure clamping of the top and bottom rolls.

Four-roll machines do not require the operator to remove, flip, and then try to square the plate a second time after pre-bending, as is the case with three-roll, initial-pinch machines. Because the material can be kept in the machine, a cylinder can be rolled to the required diameter immediately following pre-bending.