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Top 4 advantages of the stretch-forming process

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Stretch forming (stretch bending) machines can be divided into rotary-type stretch forming machines and double arm-type Stretch forming machines and various special bending machines, such as a special stretch forming/stretch bending machine for shower room, special stretch forming machine for train roof beam, and special stretch forming machine for the elevator. The stretch forming machine adopts full hydraulic control and can cold-form various steel pipes, square pipes, H-beams, I-beams, channel steels, angle irons, flat irons, and aluminum profiles with a section below 500mm.

4 advantages of the stretch forming process

Advantage 1#: Various profiles can be bent

  • Almost all sections of aluminum, steel, stainless steel, copper, and other metal profiles and pipes can be bent.

Advantage 2#: Good bending quality

  1. After spraying, electrophoresis, electroplating, polishing, wire drawing, etc., the material can be bent directly without damaging the surface of the material.
  2. 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.
  3. Bending can effectively eliminate the residual stress inside the material, and the product has good dimensional stability.
  4. 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.

Advantage 3#: Can bend a variety of curved shapes

  • In addition to bending conventional standard arcs, it can also bend a series of complex curves such as U-shaped, S-shaped, W-shaped, elliptical, parabolic, and circular arcs with straight segments, conical surface curves, and a curve with multiple radii. shape.

Advantage 4#: Strong bending ability

  1. Stretch forming (stretch bending) arc length: 12 meters
    • The one-time forming degree can reach 12 meters, which can improve the installation efficiency, reduce the installation cost, save materials and improve the quality of the project for projects that require a long arc length.
  2. Cold-formed section: 500mmx350mm
  3. Stretch forming (stretch bending) radius: Unlimited as far as the mechanical properties of the material (elongation) allow.

3 important parameters of the stretch forming process

stretch forming process
stretch forming process

Stretch Forming Radius

  • Minimum stretch forming radius: aluminum profile (R outside – R inside) / R outside ≤ 8%
  • Stainless steel profile (R outer-R inner)/R outer≤30%
  • Maximum bending radius is not limited

Stretch Forming Arc Radius Tolerance

  • The radius is less than 1 meter, and the deviation of each meter length is less than ±1mm
  • The radius is greater than 1 meter, and the deviation of each meter length is less than ±2mm

Stretch Forming Material Calculation

  • The amount of reserved chuck at the end is 300mm. Simple symmetrical small-section profiles do not need test materials, complex sections, or large sections
  • Surface profiles need to provide 1-2 test materials, and the material utilization rate is 95% based on a 6-meter profile.

4 characteristics of the stretch forming process

stretch forming machine
stretch forming machine
  1. After spraying, electrophoresis, electroplating, polishing, wire drawing, etc., the material can be stretched forming (bending) directly without damaging the surface of the material.
  2. Profiles with cavities and complex cross-sections can be formed at one time. When the relative stretch forming(stretch bending) radius allows, the inner wall will not be wrinkled and the section will not be distorted.
  3. Stretch forming(stretch bending) can effectively eliminate the residual stress inside the material, and the product has good dimensional stability.
  4. 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.