The working principle of the tandem CNC bending machine mainly involves the coordinated work of the hydraulic system, CNC system and mechanical system, and precise bending of metal sheets is achieved through precise control.
CNC system control
The core control part of the tandem CNC bending machine is the CNC system. The operator inputs the bending process parameters, including bending angle, bending length, number of bends, etc. through the CNC system. The CNC system generates control instructions based on these parameters to accurately control the working process of the bending machine.
The CNC system usually includes:
Operation panel: used to input programs and operate the machine.
CNC program: writes and stores the program code of the bending process.
Control unit: receives the input process parameters and outputs control instructions through the CNC system.
Hydraulic system
The hydraulic system is an important power source for CNC bending machines. It is responsible for driving the worktable up and down and controlling the pressure to complete the bending process of metal sheets.
Working process:
Hydraulic pump: The hydraulic pump is driven by a motor to pressurize the hydraulic oil and transport it to the hydraulic cylinder through a pipeline.
Hydraulic cylinder: The work of the hydraulic cylinder is to push the piston up and down through the action of hydraulic oil, thereby driving the worktable of the bending machine to move up and down.
Pressure regulation: The pressure control valve in the hydraulic system can adjust the pressure applied by the bending machine on the sheet to ensure that the metal sheet does not break or deform excessively during the bending process.
Mechanical system
The mechanical system includes the workbench, upper die, lower die, guide rails, etc., which directly undertake the actual bending work of the plate. The working process is precisely controlled by the instructions of the CNC system, and the mechanical parts and the hydraulic system work together to complete the precise bending.
Working process:
Up and down movement of the workbench: The upper die is pushed up and down by the hydraulic system, and the plate is placed on the workbench. The CNC system accurately controls the up and down position of the upper die to ensure that the bending force is applied at the correct position.
Mold: The upper die and the lower die are the key tools for the bending machine to bend the plate. Their shape and size determine the bending angle and bending radius. The CNC system automatically adjusts the up and down position of the mold according to the process requirements.
Clamping and support: During the bending process, the hydraulic system or mechanical system will clamp the plate to prevent the CNC bending machine from sliding or deforming during bending. The hydraulic system may also control the clamping force to ensure the stability of the workpiece.
Sensor and feedback system
Tandem CNC bending machines are usually equipped with high-precision sensors (such as displacement sensors, pressure sensors, etc.) to monitor the working status in real time and feed back data to the CNC system. This ensures that the machine can self-adjust and maintain processing accuracy throughout the entire processing process.
The role of the sensor:
Displacement sensor: Real-time detection of the vertical position of the upper die to ensure that it reaches the predetermined position accurately.
Pressure sensor: Real-time monitoring of the pressure of the hydraulic system to prevent the hydraulic pressure from being too high or too low, thereby affecting the bending quality.
Angle sensor: Used to detect the bending angle of the plate to ensure that the required angle is reached.
Principle of tandem control
The biggest difference between a tandem CNC bending machine and a traditional single-machine CNC bending machine lies in the tandem working principle of its control system.
In a tandem CNC bending machine, multiple stations or multiple machines are connected in series through a CNC system to complete more complex production tasks. This means that the actions of each bending machine are coordinated by a central control system, and each individual machine performs a specific task at a predetermined time, ensuring the overall smoothness and automation of the production line.
Main tandem workflow:
Workpiece preparation: The workpiece is sent to the first bending machine station.
Bending operation: The CNC system controls the bending machine at each station to perform the bending action and adjusts the mold settings as needed.
Transfer between stations: Between multiple bending machines, the workpiece is automatically transferred to the next station that needs further processing. This process is usually completed by an automated conveying system.
Final completion: After the workpiece passes through all stations, the final bending process is completed.
Integrated work
Under tandem control, the work of the CNC bending machine depends on the coordination between equipment. For example:
Multi-station synchronous control: multiple bending machine stations can perform bending work simultaneously or in different time periods to ensure production efficiency.
Feedback mechanism: The feedback system aggregates the data of each station to the central control system to ensure the smooth operation of the entire production line.
The tandem CNC bending machine can perform high-precision bending of metal sheets through the precise control of the CNC system, the power support of the hydraulic system and the efficient cooperation of the mechanical system. The whole process has a high degree of automation and can achieve efficient, precise and high-quality processing.