Back Gauge

The back gauge is a critical component of a hydraulic press brake that provides precise positioning of sheet metal before bending operations. It consists of a movable stop or fence that can be adjusted to control the distance from the bend line to the edge of the material, ensuring accurate and repeatable bends. This component is essential for maintaining dimensional accuracy in metal fabrication processes. The back gauge operates by moving along the length of the press brake bed, either manually or through motorized control. When sheet metal is placed against the gauge fingers, it establishes a reference point for the bending operation. The position can be adjusted via manual cranks, servo motors, or CNC controls to achieve different bend positions. Some advanced systems feature multiple fingers that can be programmed independently for complex bending sequences. Typical specifications include a back gauge stroke of 100–600 mm, positioning speed of 50–200 mm/s, positioning accuracy of ±0.05 mm, and repeatability of ±0.02 mm. The maximum back gauge force ranges from 500 to 2000 N. Control voltage is typically 24 V DC (±10%), and motor power ranges from 0.4 to 1.5 kW. Protection class varies from IP54 to IP65 per IEC 60529, suitable for dusty or wet environments. Operating temperature range is -40 to 85 °C, and relative humidity should be 10–90% non-condensing. Guide rail material is high-carbon chromium bearing steel (GCr15) per GB/T 18254. Net weight ranges from 50 to 200 kg. Materials used include steel and aluminum alloy. These values are reference ranges; verify model-specific specifications with the manufacturer or supplier.

The back gauge positions sheet metal by moving a stop or fence along the press brake bed. The operator or CNC system sets the desired distance from the bend line to the material edge. The gauge fingers contact the sheet, establishing a reference point. The position is adjusted via manual cranks, servo motors, or CNC controls. Advanced systems allow independent programming of multiple fingers for complex sequences. The movement is guided by rails made of GCr15 steel, ensuring precision and wear resistance. The system operates within specified stroke, speed, and force limits to maintain accuracy.