Introduction to the structure of the R-radius roller bending upper die—save this now!

A press brake is a critical piece of equipment in the sheet-metal industry for bending workpieces, designed to press steel plates into various shapes according to process requirements. As shown in the “Schematic Diagram of the Hydraulic Press Brake Structure,” the machine frame consists primarily of left and right columns, a worktable, and a crossbeam. Hydraulic cylinders are mounted on the columns, with the slide connected to the cylinder pistons and moving vertically along guide rails fixed to the columns. The lower die is secured to the worktable, while the upper die is mounted at the bottom of the slide. The hydraulic system provides the driving force, and the electrical system issues control commands; under the action of the hydraulic cylinders, the slide drives the upper die downward to close against the lower die, thereby completing the bending of the sheet metal. The left and right columns, the worktable, and the slide—hereinafter referred to as the “three major components”—are the key parts of the press brake, accounting for 70% to 80% of the machine’s total weight. Their strength and rigidity directly determine the machine’s operational accuracy, service life, and the precision of the finished workpieces. What is the structure of the R-radius roller-type upper die used in press braking?

1. Slider Assembly: This assembly employs hydraulic actuation and consists of a slider, hydraulic cylinders, and a fine-adjustment mechanism with mechanical limit stops. The left and right hydraulic cylinders are securely mounted on the machine frame. The piston (or piston rod) drives the vertical reciprocating motion of the slider via hydraulic power. The mechanical limit stops are controlled and adjusted by the CNC machining system.

2. Worktable section: Operated via a push-button box, the electric motor drives the material-stop frame to move back and forth, with the travel distance controlled by the CNC system; the minimum resolution is 0.01 mm (limit switches are provided at both the forward and rear positions).

3. Synchronized Drive System: This machine is equipped with a mechanical synchronization mechanism consisting of a torsion shaft, oscillating arms, and spherical plain bearings. The structural design is simple, the performance is stable, safe, and reliable, and the synchronization accuracy is high. The mechanical limit stops are adjusted by a motor, with the control values internally managed by the CNC system.

4. Material-Stop Mechanism: The material stop is driven by separate motors, with chain transmission synchronizing the movement of two lead screws. The CNC control system precisely manages the stop position.

The service life of the R-radius roller bending upper die is inextricably linked to the material selected. To extend the lifespan of CNC press brake dies, the first step is to choose high-quality die materials; only with superior material quality can the die’s performance be fully realized. In addition, to further enhance die life, it is essential to ensure continuous cutting during the bending process—any interruption in the cutting action will significantly shorten the die’s service life.

What is the workflow of the R-radius roller bending upper die? Let’s take a look.

1. After connecting the press brake to the power supply, turn on the key switch on the control panel, then press the oil pump start button.

2. Stroke Adjustment: When operating a hydraulic CNC press brake, it is essential to properly adjust the stroke. Before starting work, always perform a test run. When the upper die of the press brake descends to the bottom, there should be a gap equal to the thickness of the sheet metal. Failure to do so may result in damage to the dies and the machine. Stroke adjustment can be accomplished either through rapid electric adjustment or fine manual adjustment.

3. Selection of the press brake die opening: generally, the die opening should be 10 times the thickness of the sheet metal. For example, when using a press brake to bend 4-mm-thick sheet metal, a die opening of approximately 32 mm is recommended.

4. The back gauge on a CNC press brake typically features both electric quick adjustment and manual fine adjustment, with the same operating procedures as those for conventional press brakes.

5. Press the foot pedal switch to start the press brake. Unlike a shearing machine, a hydraulic CNC press brake allows you to release the pedal at any time; releasing the pedal will stop the machine, while pressing it again will resume the downward stroke.