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Aluminum Extrusion Stretch Forming Machine

Aluminum Extrusion Stretch Forming Machine

Aluminum extrusion stretch forming machine
Max tensile pull: 35 Tons.
Positioning control: repeatability accuracy <=±0.01mm
can bend material tensile requested range for 0.001 to 35 tons




Aluminum extrusion stretch forming machine

Max tensile pull: 35 Tons.

Positioning control: repeatability accuracy <=±0.01mm

can bend material tensile requested range for 0.001 to 35 tons

Tensile pull adjustable: 4 to 35 Tons.
Die table: 1963*1300 mm(customized by project request)
Automatic lubricating: standard equipped
Swing arms warped: rigidity deformation (measured under 30 tons tensile force, 6.5 meters position)
Gripper jaw decline: Within 5 years,2mm(decline tolerance while tension cylinders fully extended); Flatness adjustable.

Jaw height: Min center height 980mm, 0-60mm adjustable.
Jaw style: circle or rectangle as request, full liquid nitrogen.
Jaw rotation: manual, ±180°( or servo control,0-360°)
Jaw distance: Min 270mm , Max 6500mm
Jaw grip: grip speed, force adjustable, no break material.





Bending process analysis:

After the bending, due to the material's serious asymmetry in the width direction, the rebound will be unbalanced after the bending, and the distortion flatness of the two ends will not meet the requirements after forming.

Solution: A punches the ribs before punching, then bends, repairs and polishes.

The bending deformation of the B-bend male and female mold roots is pre-deformed. Process validation experiment.

After the bending, due to the large hardness range of the material, the rebound of the product is large, and the curvature of the product is poor.

At the same time, it will interact with the outer arc of the lower process.

Solution: A strictly control the extrusion hardness, so that the hardness changes within 2 degrees of Vickers hardness.

B hardness range is classified by grade. Every two degrees and one level, generally only need 2 levels, and individual incoming materials will exceed the two levels. Then open a set of molds at each level to deal with different hardness ranges.

C. The same batch of material is finished immediately. Don't wait for the next batch to be recycled.


Profile bending problems:


Panel fixture(laser cutting,observe the arc is tangent or not )
Notch(CNC mill the complete groove, or obtain key point(3d)), special fixture.

Quantity/ efficiency

1、High quality, large quantity, such as automotive parts, 40 seconds / piece, stretch bending, otherwise roll bending.
2、More than 2 times by roller bending, qualified rate guaranteed over 90%, otherwise below 40%;

Qualified rate

Roller bending: 2 times or more forming times, more than 85%; The rest 15% can be simply corrected; all saying that qualified rate more than 90% by once time deformation is deceptive, up to 50% (In roller bending there are high requirements for raw material, temperature, equipment and so on) .Stretch bending qualified rate can reach more than 99%, and the quality is higher.


Regarding to sampling or small production, shall choose roller bending,manual correction is one of the core processes (3D can not be corrected)

Checking plane

Detect inner arc or outer arc ? If outer arc stretching, internal arc will shrink or unchanged, the material must be deformed, the checking standard can only based on key point or key surface.

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