Skip to content

China High-Quality Aluminum Stretch Forming/Bending Machine Manufacturers Factory Price Sales

Stretch Forming Machine

BIT Stretch Forming Machines: AI Autonomous Learning Forming System.
Engineered For Safe Operations And Unparalleled Repeatability, With A Multi-Radius Axis, Multi-Radius, Multi-Angle, And Multi-Direction Bending Ability, Can Accurately Bend And Process Exquisite 3D Workpieces.
With The Robotic Arm, Fully Automatic Bending Processing.

Stretch Forming of Automobile Roof Rack
Automatic Profile Stretch Press

Advantages of BIT PBF Stretch Forming Machine

  • High working reliability;
  • high productivity;
  • High processing accuracy;
  • Low operation and maintenance costs;
  • Flexible, precise, and efficient.
stretch forming machine
PBF-C Stretch Forming Machine

PBF-C Stretch Forming Machine

PBF-C stretch forming machine is civil grade stretch bending equipment: hydraulic control, with unique rebound control technology, good stretch forming quality, stretch forming ability, and the position accuracy is over 0.01mm. It can realize the perfect stretch forming of each stretch and bending, and the super high accuracy makes the specifications of each workpiece have a unified standard.

High bending quality

  • After spraying, electrophoresis, electroplating, polishing, wire drawing, etc., the material can bend directly without damaging the surface of the material.
  • Profiles with cavities and complex cross-sections can be formed at one time. When the relative bending radius allows, the inner wall will not be wrinkled and the section will not be distorted.
  • Bending can effectively eliminate the residual stress inside the material, and the product has good dimensional stability.
  • Due to the cold work hardening of the metal material, the comprehensive mechanical properties of the material can be improved after the material is stretched and bent.

Strong Bending Ability

  • Maximum bending arc length: 12 meters
  • The maximum length of one molding can reach 12 meters, which can improve installation efficiency, reduce installation costs, save materials and improve project quality for projects that require a longer arc length.
  • Maximum cold-formed section: 500mmx350mm
  • Bending Radius: Unlimited as permitted by material mechanical properties (elongation)
  • The maximum tensile force of the PBF-C Stretch Forming Machine can reach 300 tons.

Standard Model Parameters

Standard longitudinal profile stretch forming press machines: The table hereunder is an indication to give you an overview of the machines we already installed. Each machine can be customized according to your requirements.

Model PBF-C-10PBF-C-40PBF-C-40+PBF-C-60PBF-C-80PBF-C-100PBF-C-100+PBF-C-160PBF-C-160+PBF-C-200PBF-C-300
Max. Stretching. Force (ton)1040406484108108168168200300
Max. Part. Length(mm)300040006000650065007000900012000120001200012000
Min. Part. Length(mm)400800120018001800250025004500450045004500
Max. Finished. Angle(deg)180180180180180180180180180180180
Min. Forming. Radius(mm)2502505005007507501500150015001500
Max. Section(mm)80×90140×140140×140200×180200×200250×300250×300300×350300×350350×400350×500
PBF-C has two forms of stretch forming press: PBF-C Stretch Forming Machine and PBF-CT Stretch Forming Machine
stretch forming machine
stretch forming machine

PBF-Plus Stretch Forming Machine

Customized to your specifications, our PBF-Plus series of stretch forming machines can manufacture complex shaped parts while maintaining precision and repeatability.

2D & 3D CNC Stretch Forming Machine & Stretch Bending Machine for automotive car roof rail, bumper, and pillar.
They are also suitable for automotive, escalator, aerospace, rail transit, conveyor, curtain wall, door and window, roof, lighting, and other industries.

Profile stretch forming is a very repeatable profile forming process in 2D or 3D space, which has the following advantages:

  • Good accuracy and repeatability due to the absence of springback and residual stress
  • Complex shapes can be formed
  • Reduce assembly operations
  • Parts are not deformed after welding or machining
Stretch Forming Automobile Bumper Beams

A stretch forming machine is a metalworking machine used to form metal sheets or extrusions into complex, curved shapes by stretching them beyond their elastic limit so that they can be bent around molds or dies.

Stretch forming machines can apply tension in various ways to shape metal sheets or extrusions, and they come in different types, depending on the direction in which the stretch occurs and the method used to apply tension to the workpiece.

In general, stretch forming machines consist of a gripper or clamp to hold the metal sheet or extrusion while it is stretched over a die or mold, a hydraulic or mechanical system to apply the necessary force to control the stretching, and a control system that manages the process.

Other name of stretch forming machine

The Stretch Bending Machine (also named Strech Forming Machine, and Profile Stretch Press) can be divided into rotary type Stretch Bending Machine and double arm type Stretch Bending Machine, and various special stretch bending machines, such as special stretch forming machines for shower rooms, special forming bending machine for train roof beam, and special stretch forming machine for the elevator.

The Stretch Bending Machine adopts full hydraulic control and can cold-form (cold bending) various steel pipes, square tubes, H-beams, I-beams, channel steels, angle irons, flat irons, and aluminum profiles with a section below 500mm.

What are the different types of stretch forming machine?

  • Longitudinal stretch forming machine stretches the workpiece along its length and is commonly used in the aerospace industry to create wing and fuselage skins, among other components.
  • Transverse stretch forming machine stretches the workpiece along its width and is typically used in the automotive industry, where it can create complex, curved shapes for components like fenders, hoods, and bumpers.
stretch forming machine
Stretch Forming Machine(Applied to Aluminum Roof Rack)

Stretch forming is a metal forming process used to shape sheet metal into contoured or curved profiles. It involves stretching a sheet of metal over a form or die to achieve the desired shape. Unlike traditional bending methods that rely on bending the metal around a single point, stretch forming distributes the deformation along the length of the material, allowing for greater control and precision in shaping complex curves.

The variety of materials with properties suitable for this forming process include stainless steel, clad metals, nickel, aluminum, brass and titanium alloys, and other heat-resistant and refractory metals. In some cases, parts formed using these materials are difficult or impossible to form by other methods.

The aerospace industry initially invented the stretch forming presses used to form aluminum aircraft parts to reduce weight to improve fuel efficiency. Today they are used worldwide across industries such as automotive for body and frame components, architecture to create curved structural elements, and the rail car industry for structure frame components. Read More: Profile Bending Machine: 5 Things Before Buy, 6 Steps to Bend

4 Pros of Stretch Bending

  • Minimizes internal stress: Stress is reduced due to the normalized grain structure of the metal after heat treatment and forming process, greatly reducing spring-back.
  • High volume output: Stretch forming is a rapid process and well suited to higher volume output.
  • Large parts: larger parts can be formed with senior aerospace thermal engineering’s open access cold stretch presses.
  • Lower cost: Stretch forming is lower cost than cold draw forming due to simpler forming tools being used.

Top 6 Steps of Stretch Forming Process

The variety of materials with properties suitable for this forming process includ

The stretch forming process typically involves the following steps:

  • Material Selection: The first step is to choose the appropriate sheet metal material, such as aluminum, stainless steel, or titanium, based on the desired strength, durability, and aesthetic properties of the final product.
  • Pre-Forming: Prior to stretch forming, the sheet metal may undergo pre-forming operations, such as cutting, trimming, or initial bending, to approximate the desired shape. This helps reduce excessive stretching and material deformation during the stretching process.
  • Clamping: The sheet metal is clamped at its edges or held in place using specialized clamping devices. This ensures that the material remains in position and prevents unwanted movement during the stretching process.
  • Stretching: The sheet metal is subjected to tension forces using hydraulic or mechanical devices. The stretching force is applied gradually and uniformly along the length of the material. This elongates the metal, allowing it to conform to the shape of the form or die.
  • Forming: As the metal is stretched, it is guided over the form or die, which imparts the desired curvature or profile to the sheet. The form may have a curved or contoured surface, depending on the specific shape required for the end product.
  • Release and Trimming: Once the stretching and forming are complete, the clamps are released, and the formed component is removed from the machine. Excess material or irregularities along the edges of the formed part are trimmed or removed to achieve the final desired shape and dimensions.

Conclusion

Stretch forming offers several advantages over other forming methods. It allows for the creation of complex and precise shapes with minimal deformation or distortion of the material. The process can accommodate a wide range of sheet metal thicknesses and can produce large, seamless components. Stretch forming is commonly used in industries such as aerospace, automotive, architecture, and construction for applications that require curved or contoured metal components with high strength, dimensional accuracy, and aesthetic appeal.

stretch forming machine
Stretch Bending Machine
stretch forming machine
Stretch Forming Machine
Stretch Forming Machine
Stretch Forming Machine( Aluminum Roof Rack Bending)
Profile Stretch Press(Alumiminoum Bumper Beam Bending)

Application of Stretch Forming Process

The variety of materials with properties suitable for this forming process include stainless steel, clad metals, nickel, aluminum, brass and titanium alloys, and other heat-resistant and refractory metals. In some cases, parts formed using these materials are difficult or impossible to form by other methods.

stretch forming machine
stretch forming machine
Profile Stretch Press

The aerospace industry initially invented the stretch forming presses used to form aluminum aircraft parts to reduce weight to improve fuel efficiency. Today they are used worldwide across industries such as automotive for body and frame components, architecture to create curved structural elements, and the rail car industry for structure frame components.

Aerospace Industry

Stretch forming plays a crucial role in the aerospace industry for the manufacturing of aircraft components. It is used to create curved and contoured shapes for wing skins, fuselage sections, and other structural parts. The process ensures precise dimensional accuracy, excellent surface finish, and structural integrity, meeting the stringent requirements of aerospace applications.

Automotive Industry

In the automotive sector, stretch forming is employed to produce various components, especially those requiring complex curves and contours. It is used for manufacturing automotive body panels, such as roof skins, hoods, fenders, and door panels. Stretch forming enables the creation of lightweight, aerodynamic, and visually appealing automotive components with excellent fit and finish.

Architecture and Construction

Stretch forming finds application in architectural and construction projects that involve the creation of curved metal structures. It is used to fabricate curved metal panels, roof systems, canopies, and other architectural elements. The process allows for the production of visually striking and structurally robust metal components that enhance the aesthetics and functionality of buildings and structures.

Marine Industry

In the marine industry, stretch forming is utilized for the fabrication of curved metal components for boats and ships. It is commonly used for manufacturing hulls, deck sections, and other structural parts. Stretch forming ensures the production of strong, lightweight, and corrosion-resistant metal components that withstand the harsh marine environment.

Rail and Transportation

Stretch forming is applied in the rail and transportation industry for manufacturing curved metal components for trains, subway cars, and other vehicles. It is used to create curved roofs, side panels, and structural members. The process enables the production of lightweight and durable components that meet the stringent safety and performance requirements of the transportation sector.

Furniture and Design

Stretch forming is sometimes utilized in the furniture and design industry to create unique and custom metal furniture pieces. It allows for the production of curved metal frames, chair bases, decorative accents, and other design elements. Stretch forming adds a touch of elegance and sophistication to furniture and architectural designs.

Industrial and Manufacturing Equipment

Stretch forming is employed in various industrial and manufacturing sectors to produce components for machinery, equipment, and infrastructure. It is used to create curved and contoured parts for conveyors, tanks, frames, and other industrial applications. Stretch forming ensures the production of components with precise geometries, structural strength, and dimensional accuracy.

These are just a few examples of the applications of stretch forming. The process is versatile and can be adapted to suit the requirements of different industries. With its ability to create complex shapes with excellent precision and quality, stretch forming continues to be a valuable manufacturing technique in various sectors.

Read More: The Best Guide to The Stretch Forming Process