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Press brakes are essential equipment for forming sheet metal. They also serve as a core component in the sheet metal fabrication process. Not only do they enable precise forming of metal sheets, but they also determine the dimensional accuracy and surface finish of the final product.
A press brake is a mechanical device that utilizes die coordination to apply pressure to sheet metal, causing plastic deformation to achieve the desired angle or shape. It serves as essential equipment for cold forming of metal sheets and is widely used in sheet metal forming processes.
The fundamental components of a press brake include the following key parts:
Frame/Body: The main structural framework that bears the processing load.
Ram: Performs vertical movement to drive the upper die during bending.
Work Table: Supports the lower die and the workpiece.
Synchronization System: Ensures balanced ram movement.
Back Gauge: Enables precise positioning of the sheet metal.
Dies: Directly determine the bend shape and angle, used in combination with both upper and lower dies.
The press brake operates based on the principle of plastic deformation in metal. It applies pressure to the sheet metal via dies, forcing it into a V-shaped groove to achieve permanent deformation.
The primary steps are as follows:
Preparation Stage: Input the bending program and install the appropriate dies.
Positioning Stage: Secure the workpiece against the backstop to ensure precise bending positioning.
Bending Process: The ram descends, forcing the upper die to press the sheet into the lower die’s groove, causing plastic deformation.
Angle Compensation: The CNC system automatically corrects springback errors to ensure forming accuracy.
Return Pickup: The slide rises, the workpiece is removed, completing one cycle.
| Type | Drive Method | Advantages | Disadvantages | Application Scenarios |
|---|---|---|---|---|
| Mechanical | Flywheel + Clutch | Simple structure, high power, low cost | Cannot stop mid-operation, average precision, high noise | Suitable for high-volume, single-angle bending |
| Hydraulic | Hydraulic cylinder drive | Stable pressure, high precision, multi-angle capability | Requires hydraulic oil, must not exceed rated tonnage | Multi-purpose sheet metal processing |
| CNC Hydraulic | Hydraulic + CNC System | High precision, automatic compensation, programmable | High cost, requires training | Automotive, aerospace, precision sheet metal |
| Servo-Electric Type | Servo Motor + Ball Screw | Energy-efficient and eco-friendly, simple maintenance, no oil contamination | Limited torque, suitable only for small to medium tonnage | Precision bending, small workpieces |
| Pneumatic | Compressed air driven | High speed, simple structure, low cost | Low force, limited to thin sheets and small parts | Light industry, electronic product casings |
| Tandem | Multi-machine Tandem | Capable of processing extra-long panels with high efficiency | Requires large footprint and significant investment | Curtain walls, large-scale equipment |
Selecting a press brake requires consideration of processing requirements, tonnage, control systems, and die configuration.
Processing Requirements: Sheet material, thickness, length, and precision specifications.
Tonnage Selection: Determines the maximum sheet thickness and length that can be bent.
Control System: Systems like DELEM, ESA, and Cybelec vary significantly in functionality.
Die Selection: V-groove width and upper die shape influence bending capability.
Equip with light curtain protection and two-hand control buttons.
Operators must wear protective gear.
Conduct regular maintenance on hydraulic and electrical systems.
Never exceed the rated capacity.
The press brake is an indispensable core piece of equipment in modern sheet metal processing. Its evolution has significantly enhanced manufacturing efficiency and processing precision. With the advancement of smart manufacturing, the press brake will continue to play a pivotal role in industrial production.
Tags: Press brake
