Manufacturing Process of Bending Machines
Release time：2026-03-24
I. Preliminary Design and Material Preparation
- Scheme Design : Complete the design of the overall machine structure, hydraulics, electrical systems, and CNC system based on tonnage, precision, and control type (electro-hydraulic, torsion-bar, or CNC), and determine the tolerances and manufacturing processes for critical components.
- Material Selection The frame, slide block, and worktable are fabricated from high-strength steel plates such as Q345B and 45# steel, ensuring excellent rigidity and resistance to deformation.
- Raw Material Inspection : Steel plates are received into inventory for physicochemical testing and non-destructive examination, followed by pre-treatment for rust removal and leveling.
II. Precision Manufacturing of Structural Components (Core Processes)
- Cutting and Rough Machining
- CNC flame/laser cutting for blanking, and machining of weld bevels and datum surfaces.
- Assembly and Welding Quality Control
- Gas-shielded welding and robotic automatic welding are employed, with beveling and mortise-and-tenon joint assembly at critical locations to ensure adequate penetration and structural strength.
- Ultrasonic testing of welds to eliminate cracks, porosity, and slag inclusions.
- Stress relief (aging)
- Post-weld vibration stress relief, annealing, or normalizing is performed to completely eliminate residual stresses and prevent deformation during service.
- Precision Machining
- Large floor-mounted boring-milling and gantry milling machines undergo one-time, precision finishing of the frame, slide blocks, and worktable as a whole, ensuring geometric tolerances and fit accuracy.
III. Machining and Assembly of Core Components
- Hydraulic system : Precision machining of the main hydraulic cylinder, valve manifold, and pump station → cleaning → assembly → pressure-withstand test at 1.5 times the rated pressure.
- Synchronization mechanism : Electro-hydraulic servo/torsion-bar synchronous mechanism—grinding and final assembly, with control of synchronous error ≤0.02–0.05 mm.
- Mold : Forging of tool steel → CNC machining → Quenching and tempering → Precision grinding, ensuring hardness and dimensional accuracy.
- Rear stop : Servo motor, ball screw, and linear guide assembly ensure positioning accuracy.
IV. Final Assembly and System Integration
- Level the machine frame (horizontal deviation ≤ 0.02 mm/m) → lift and install the slide block → perform lapping of the guide rails → install the hydraulic cylinder, synchronization mechanism, worktable, and compensation device.
- Hydraulic pipeline connection, venting, and pressure maintenance; electrical and CNC system wiring, terminal connection, and commissioning.
V. System Commissioning and Quality Acceptance
- No-load commissioning : Inspect slider motion, synchronization, back gauge positioning, and CNC system functions.
- Load testing : Perform trial folding at the rated tonnage to verify the bending angle, straightness, and repeat positioning accuracy.
- Factory Inspection : Comprehensive performance testing, visual and safety inspections; upon passing, painting, packaging, and shipment follow.
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