The methods of CNC press brake machine to achieve high-precision bending involve multiple aspects, including mechanical design, control system and operation technology.
Mechanical design optimization
Through finite element analysis and topology optimization, the structure of CNC press brake machine can be optimized to improve its rigidity and strength, thereby ensuring stability and accuracy during processing. For example, the use of parametric modeling methods can be used to optimize the design under different conditions to achieve the best mechanical performance.
High-precision control system
The use of advanced numerical control systems (CNC) is the key to achieving high-precision bending. These systems allow operators to input detailed bending parameters and ensure bending accuracy through precise mathematical calculations and model simulations. In addition, some high-end CNC press brake machines are also equipped with embedded controllers to improve the accuracy and speed of bending processing.
Mechanical compensation technology
In order to overcome the influence of the deformation of the machine tool itself on the bending accuracy, many CNC press brake machines are equipped with mechanical compensation systems. For example, hydraulic compensation and throat deformation compensation technology can ensure good bending strength and accuracy. In addition, the use of linear displacement feedback devices such as high-precision grating rulers can monitor and adjust the position error in the bending process in real time, thereby realizing closed-loop control and intelligent compensation.
Hydraulic compensation technology is mainly used to solve the deflection deformation problem caused by uneven force on the plate during the bending process. The specific working principle is achieved through a group of cylinders installed in the lower workbench. These cylinders can automatically adjust the position of the workbench according to the instructions of the CNC system to form an ideal convex curve, thereby ensuring that the relative position relationship between the slider and the workbench remains unchanged after force is applied. This compensation amount is automatically calculated and determined by the CNC system based on the plate thickness, mold opening and material properties. The hydraulic compensation system adopts a two-way oil supply solution to reduce pressure loss along the process and improve compensation speed and accuracy.
The throat deformation compensation device uses a magnetic scale to measure and feedback the distance between the slider and the workbench, and controls the hydraulic proportional servo valve through the CNC system to achieve precise synchronization. This structure can effectively prevent non-standard workpieces from colliding with the magnetic scale and interfering with the magnetic scale, thereby improving production efficiency.
Servo drive technology
The servo motor-driven Y-axis control system can provide high-precision bending operations, ensure the dimensional accuracy of the processed workpiece, and maintain consistency in repeated bending tasks. This technology can also achieve precise positioning of the X-axis, R-axis and Z-axis through servo control, further improving the bending accuracy.
The servo motor is one of the core components for achieving precise positioning. It can accurately control the position, speed and acceleration to ensure that the moving parts can move according to the predetermined path. The servo motor is usually used in conjunction with a servo drive to adjust the motor’s operating state in real time through feedback signals to achieve high-precision positioning requirements.
In specific applications, such as in CNC press brake machines, servo drive technology can significantly improve bending accuracy. Bending accuracy is affected by many factors, including the accuracy of the stopper positioning, the dimensional accuracy of the workpiece, and the straightness of the bending corners. By adopting servo drive technology, precise control of the X-axis, R-axis and Z-axis can be achieved, thereby reducing positioning errors and improving overall processing accuracy.
Operation and maintenance
Correct operation methods and regular maintenance are also important factors to ensure high-precision bending. Here are some key recommendations:
Regular maintenance: Regular cleaning, lubrication and calibration are key to ensuring the CNC press brake machine maintains optimal performance over the long term. This includes checking the insulation of electrical components, the shielding of transmission parts, and the reliability of the machine body.
Use advanced CNC systems: Using CNC systems with high-precision servo motor control can improve response speed and processing accuracy. In addition, the automatic calculation of the table deflection compensation function can also effectively improve processing accuracy.
Optimize mold design and adjustment: Control the processing accuracy of the upper and lower molds or modify the design gap, clean the mold in time, and adjust the length of the upper mold blade into the lower mold. Measures such as these can help improve bending accuracy.
Use a monitoring system: Real-time monitoring of vibration and cutting load data during processing can help detect abnormalities in time and make adjustments to avoid damage and improve processing quality.
Program optimization: Processing accuracy can be further improved by programming according to basic dimensions and using radius compensation to consider the position of the tolerance zone.
Safe operation: Follow safety guidelines to ensure that operators can maximize the life and reliability of the equipment.
