Crowning System

HIGH PRECISION & ADAPTIVE CROWNING SYSTEM

By avoiding machine deflection, the RAYMAX Crowning™ System creates precise parts, consistently parallel with every run.

What is press brake deflection?

Definition and generation of bending machine deflection

Bending machine deflection is the bending phenomenon of the pressure head and bed caused by the structural design of a long-stroke bending machine (≥8 feet/2.4 meters) under load, which is manifested as the blunting of the bending angle in the middle area (such as the 90° target becomes 98°), that is, the “canoe effect”. The root cause is that the structure driven by the hydraulic cylinders at both ends concentrates the support force on both ends of the machine, and the rigidity in the middle is insufficient.

Comparison of deflection compensation schemes and techniques

1. Shim compensation method (traditional inefficiency)

Principle: Insert thin metal sheets, paper or cardboard under the mold manually to partially raise the mold height to correct the angle deviation.
Limitations:

  • Relying on operator experience, repeated bending tests are required, high scrap rate, and low production efficiency.
  • Increased tool wear and long-term cost increase.
  • Only applicable to emergency or small batch scenarios (should be used as the last alternative).

2. Servo electronic pulley system (high-precision active control)

Principle: Some modern bending machines use servo electronic pulley systems to evenly distribute the driving force over the entire length of the machine and offset the deflection caused by concentrated loads at both ends.
Advantages: Almost eliminate deflection, suitable for high-precision continuous processing.
Key restrictions:

  • The mold V-mouth width must be strictly followed ≥ 8 times the material thickness (otherwise deflection may still occur). If you need to know the correct method of use, it is recommended to consult the manufacturer to obtain the highest accuracy.

3. Hydraulic crowning system (dynamic real-time compensation)

Working mechanism: Some bending machines have built-in hydraulic crowning when they leave the factory. The hydraulic cylinder preloads the bed to form a reverse deflection to offset deformation. The dynamic version can monitor the material/machine status in real time and adjust it.
Advantages:

  • Adaptive to material thickness fluctuations.
  • High integration and low maintenance cost.
  • Suitable for high dynamic load scenarios (such as high-strength sheet bending).

4. Mechanical crowning system (mainstream modification solution)

Application features:

  • Pre-bend the bed through mechanical structure (screw/cam) or CNC motor to compensate for deflection.
  • Support pre-installation on new machines or modification of old machines, and adapt to hydraulic/manual clamping needs.

Selection points:

  • Accuracy level (digital readout > analog).
  • Drive mode (CNC > hand crank).
  • System rigidity and long-term stability.

Technical selection suggestions: hydraulic crowning > mechanical crowning > servo electronic pulley > shim compensation;

RAYMAX’s recommendations

Unless your press brake is equipped with a hydraulic crowning system, a mechanical crowning system may be the solution you need to compensate for deflection. Don’t make the mistake of thinking that all mechanical crowning systems are the same and buy them at will. Before investing, consider your application scenarios and challenges, and determine which features you need to improve productivity and efficiency.

For more information on the press brake crowning system, please see below or call us！

Incorrect-Preload-Crowning

Proper Preload Crowning
Exaggerated to Demonstrate

RAYMAX Crowning System

CNC crowning: guaranteeing a perfect bend angle every time!

  • By preloading the machine, CNC crowning counteracts any possible deflection and tool wear under machine load, ensuring a constant bend angle throughout the entire length of the machine, guaranteeing smooth operation of the contact surface under load.
  • With the CNC clamping system, pre-programmed with advanced machine characteristics and deflection data, manual crowning allows quick and easy development of simple sub-tables or charts for each application.

Experience unprecedented precision, reliability and efficiency! Boost your machining capabilities today!

Deflection Compensation Workbench

Deflection Compensation Workbench

The workbench structure is characterized by being divided into a cover plate and a base. A rectangular groove is set on the base, within which multiple sets of wedge blocks are installed. These wedge blocks can be adjusted manually or by a motor, allowing their positions to change at different angles inside the workbench. This adjustment creates a deflection compensation curve along the length direction, enabling automatic adjustment of the deflection compensation amount across the entire length of the press brake. The CNC (electric) deflection compensation workbench enables the displacement signals of the wedge block groups to be automatically transmitted to the machine’s CNC system via displacement sensors.

RAYMAX PPO Family CNC Crowning

RAYMAX PPO® Family CNC Crowning

The RAYMAX Pro® adaptive CNC crowning system allows users to compensate for beam deflection during bending. This ensures consistent angles along the entire length of the plate.

  • Due to symmetrical adjustment, the tool can be easily reversed.
  • Hand crank with numerical readout or CNC electric drive directly connected to the machine.
  • Hardness reaches 28–32 HRC, significantly higher than competitors.
  • Micro-crowned every 200 mm.
  • T and Y adjustable 0–0.76 mm (0–0.030 in).
Get A Quote
Wila Tool Holders And Crowning System

Wila® Tool Holders And Crowning System

The WILA® system enables users to compensate for beam deflection during bending. As a result, the angle remains constant across the entire length of the plate.

Advantages:

  • Easy tool reversibility
  • Hydraulic clamping
  • Quick die clamping

Standard:

  • CNC deep-hardened tool seats
  • CNC drive unit, motor located on one end
  • Specifically designed for press brakes with UPB-II punch holder type

Please drop your contact to get in touch within 24 hours.