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PBF-80 Stretch Forming Machine

The PBF-80-80 Stretch Forming Machine is an advanced solution, featuring a single stretching cylinder capable of exerting an impressive maximum pulling force of 80 tons. This versatile machine is engineered for handling elongated workpieces, accommodating materials with a maximum length of 8 meters and a minimum length of 2.5 meters, with the capability to achieve a minimum bending radius of 1500mm.

stretch forming machine
stretch forming machine

Primarily utilized across several industries including architectural decoration, steel structures, rail transportation, curtain walls, and conservatories, the machine excels in bending steel, stainless steel, and aluminum profiles into arc shapes. The feasibility of stretch bending materials is contingent on the material’s bending radius and thickness.

With its significant 80-ton pulling force, this Stretch Forming Machine ensures precise and controlled bending, facilitating the creation of curved structures from various materials. Its applications extend to sectors requiring precision-formed metal profiles for architectural embellishments, structural elements, transportation infrastructure, and more.

The PBF-80 Stretch Forming Machine’s capability to handle elongated workpieces and achieve small bending radii makes it a crucial tool for industries requiring curved profiles. Its ability to manipulate diverse materials into curved shapes caters to the demands of modern architectural designs, steel structures, transportation components, and various applications where precision-formed arcs are necessary.

Main Parameters

Length of stretchable2500~8000mmWith both ends
Max pulling force of a single stretch cylinder800KN 
Horizontal rotation angle of stretch cylinder≥35° 
Main oil pump nominal80+40 ml/rTwo plunger pumps, one for MCY: one for YCY
Hydraulic system max pressure25MpaMeet the range of processing requirements
Total motor power18.5+11KWTwo motors, 4 levels, 1480Rpm
Bending min radiusR1500mmMeet the range of processing requirements
Max angle of single-arm rotation95° 
Max distance between the end of the two chucks8000mmMeet the range of processing requirements
Min distance between the end of the two chucks2500mmMeet the range of processing requirements
Chuck clamping max sizeCustomized 
Control the number of cylinders6 
Motor drive screw travel stroke2500mAdjust the position of the stretching cylinder to ensure the effective control of the length of the stretched and bent material.
Bend angle180°Meet the range of processing requirements
Stretching cylinderD250/d160Meet the range of processing requirements
Bending cylinderD220/d90Meet the range of processing requirements
Collet cylinderD140/d90Meet the range of processing requirements
PLC controlSiemens 
Touch monitorWeilonProgrammable, store repeat operation.
Power supply  380V(AC)±15%  50HZCustomized
Ambient temperature -15℃ ~ 45℃ 
Working area14000*8000

Outsourced parts matching

Bearing3 seriesSKFSweden
Servo controller8-axis motion controllerSolid highShenzhen
Hydraulic power unitServo motor driveHaitianNingbo
Servo oil pumpA10Rexroth GermanyChina
Servo motor Eston/High MikeNanjing/Wuxi
Pressure SensorDanfossDenmark. DanfossChina
Motion detectorPull wireKaisiJinan
Photoelectric encoderEE-SX671 Slot photoelectricOmronChina
Low voltage componentsContactor, switch buttonSchneiderChina
High pressure oil filterDF-H30X10CDawnWenzhou
Oil return filterSPX-06X25DawnWenzhou
Lubrication device Flow all overWenzhou

Working Princple

The bending process follows the principle of die-based forming, where the shape of the mold is crafted to match the design specifications outlined in the product drawings. The curvature radius of the mold considers the material’s spring-back coefficient.

  1. Material filling: When dealing with thin-walled materials and tight bending radii, the internal cavity of the material requires filling. Fillers such as sand, wooden blocks, or PP boards are used. In cases where necessary, external clamps (F-clamps) secure the material’s outer surface to prevent deformation during bending. Solid core materials don’t require filling.
  2. The internal cavity at both ends (clamping ends) of the material utilizes steel processed into corresponding blocks to fit into the material’s cavity according to the mold’s shape. Solid core materials don’t require filling.
  3. Clamping the material in place.
  4. Stretching the material.
  5. The machine’s arms close gradually, bringing the material closer to the mold until it completely conforms to the mold’s shape, ultimately producing the required form.

Design, Fabrication, Installation and Acceptance Criteria

How to bend aluminum tubing (Stretch forming and other 3 methods)
  • JB/T1829-1997 General technical conditions for forging machinery
  • GB17120-1997 Safety technical conditions for forging machinery
  • JB/T8609-1997 Specifications for Welded Parts of Forging Machinery
  • JB3623-84 Forging Machinery Noise Measurement Method
  • GB3766-83 General technical conditions for hydraulic systems
  • GB16754-1997 Design principles of mechanical safety emergency stop
  • GB/T5226.1-1996 Industrial Machinery and Electrical Equipment Part 1: General Specifications
  • JB/T5936-1991 Construction machinery – General technical conditions for machining parts
  • JB/T5994-1992 General technical conditions for assembly
  • JB/T5946-1991 General technical conditions for construction machinery painting
  • QB/8273-2009 Technical conditions of hydraulic bending machine


The PBF-80-80 Stretch Forming Machine, with its 80-ton pulling force from a single stretching cylinder, epitomizes cutting-edge metalworking technology. Engineered to handle workpieces ranging from 2.5 meters to an impressive 8 meters in length, this machine effortlessly achieves a minimum bending radius of 1500mm, catering to various industries like architectural decoration, steel structures, rail transportation, curtain walls, and conservatories.

Its proficiency in bending steel, stainless steel, and aluminum profiles into intricate arc shapes meets the demands of modern architectural designs and structural applications. This precision is ensured by the substantial pulling force, guaranteeing consistent accuracy in crafting curved structures.

Featuring high-quality outsourced components from renowned brands, such as SKF, Siemens, Rexroth, and Omron, this machine assures reliability and efficiency in operation. The stretching process follows a meticulous die-based forming principle, meticulously filling, clamping, and stretching materials to achieve the desired product shape as outlined in product drawings.

Compliance with stringent industry standards for design, fabrication, installation, and safety underscores its commitment to quality and adherence to technical specifications.

In summary, the PBF-80-80 Stretch Forming Machine represents the pinnacle of technological innovation, offering versatility and precision for various industries. Its ability to create high-quality curved metal profiles serves as a cornerstone for contemporary architectural, structural, and transportation applications.