cnc press brake china

First, the basic concept and classification of bending machine Step 1 Define A bending machine is a device that produces plastic deformation in a mold by applying pressure to a sheet metal to form a predetermined Angle or shape.   2. Main types Mechanical bending machine: pressure is provided by mechanical transmission (such as gears, crankshaft), simple structure but low precision, suitable for small machining. - Hydraulic bending machine: driven by hydraulic system, high pressure, high stability, suitable for medium and thick plate processing. Numerical control bending machine (CNC) : through the CNC system to control the bending Angle, pressure and rear stop material positioning, high precision, high efficiency, suitable for mass production of complex workpieces. - Servo electro-hydraulic bending machine: Combining hydraulic and servo motor technology, energy saving and fast response speed. Second, the core structure and function of the bending machine 1. Fuselage: The frame that supports the overall structure must have high rigidity to withstand bending forces. 2. Slide block: a pressure component that moves up and down to connect the upper die and apply pressure. 3. Workbench: a platform for fixing the lower die, usually equipped with an adjustable V-shaped slot. 4. Hydraulic system (hydraulic/electro-hydraulic model) : composed of oil pump, cylinder, valve group, etc., to control pressure and stroke. 5. Back Gauge: the key component of CNC bending machine, which is used for plate positioning and directly affects bending accuracy. 6. Numerical control system (CNC model) : input parameters (Angle, pressure, stroke) to control the bending process. Third, basic knowledge of bending process 1. Bending principle - Pressure is applied to the sheet through the die to cause plastic deformation of the material. - Key parameters: bending Angle, bending radius, bending force (related to material thickness and strength).   2. Material characteristics - Elastic modulus: the ability of the material to resist deformation (such as stainless steel, which needs over-bending compensation). - Minimum bending radius: Avoid material cracking, depending on material thickness and type. - Springback: The Angle bounce of the material after unloading needs to be compensated by bending or mold design.   3. Bending force calculation - Formula: 'P = (1.42 × σb × L × t²)/V' -σb: Material tensile strength (MPa) -L: Bending length (mm) -t: Material thickness (mm) -V: lower die opening width (mm)   Four, mold selection and use 1. Mold type - Upper die (Punch) : Common shapes include sharp knife die, curved knife die, gooseneck die. - Lower Die (DIE) : The bending radius is determined by the width of the V-shaped groove, which should be selected according to the thickness of the material (usually the width of the V-port = the thickness of the material ×8). - Special mold: used for rolling, flattening, multi-step molding and other processes.   2. Mold materials - Tool steel (Cr12MoV), alloy steel, heat treatment to improve wear resistance.   3. Matching principle - Ratio of plate thickness to V-groove width (usually 1:8) to avoid material deformation or mold damage.   5. Operation process and safety specifications 1. Procedure - Equipment inspection (hydraulic oil, lubrication system) → Select mold → input parameters (Angle, pressure) → Position plate → bending test → adjustment compensation → mass production.   2. Safety precautions - Wear protective gloves/glasses to avoid cutting the board burrs. - Do not put hands in the mold area. - Check the tightness of the hydraulic system regularly to prevent oil leakage.   Six, common problems and solutions 1. The rebound is too large - Solution: Increase bending Angle compensation, use mold with correction function or CNC system. 2. Bending crack - Reason: poor material ductility or bending radius is too small → Replace soft material or increase R Angle. 3. Size deviation - Calibrate rear stop, check mold wear or NC system parameters.   Seven, equipment selection and market positioning suggestions 1. Target customer analysis - Sheet metal processing plants, chassis cabinet manufacturers, auto parts companies, etc. 2. Equipment selection - Small enterprises: hydraulic CNC bending machine is recommended (economical and practical). - High-end market: servo electro-hydraulic bending machines or high-precision models with laser detection. 3. Technology trends - Intelligent: Integrated AI Angle compensation, automatic mold change system. - Energy saving: servo motor drive to reduce energy consumption. Maintenance and maintenance 1. Routine maintenance - Clean mold and table debris. - Check hydraulic oil level and oil quality. 2. Regular maintenance - Replace hydraulic oil filter every 500 hours. - Lubricate moving parts such as guide rails and lead screws.