3 Types of Axial Fan Flange Fabrication Processes

General fan flange production adopts the method of rolling and processing with a section bending machine

Related:Attention point of cold bending of angle flanges

Types 1#: Flanges Rolled by Profile Bending Machine

• Step 1 – Determine the width, length and thickness of the roll flange:
  • Width: outside diameter-inside diameter +10;
    Length: [(outer diameter + inner diameter) ÷ 2+4~5]×3.14;
    Among them, the correction factor 4~5 is determined by the flange size, and 90 or more is 5mm;
    Thickness: Drawing flange thickness.
• Step 2 – Pre-bending pressure head: Pay attention to the sharp corner must be cut flat
• Step 3 – Roll flange: Angle Bending Machine rolled, with card template to correct the curvature of the circle.
• Step 4 – Shaping: Flange face straight
• Step 5 – Welding
  • Before welding, leave about 2mm welding seam at the flange joint;
  • After welding, the surface weld bead is polished and smoothed.
• Step 6 – Car processing
  • Stack flange welding, the number of flanges according to the length of the drill;
  • Outside diameter According to the drawing size, the inner diameter is +2mm according to the drawing size.
• Step 7 – Drilling: Line or template

Types 2#: Overall Cut Flange Manufacturing Process

When the flatness of the flange is required to be high, the whole set of cuts should be adopted as much as possible to reduce the material waste.

• Step 1 – Determine the inner diameter and outer diameter of the flange: Inner diameter: Drawing size + 5mm; Outside diameter: Drawing size + 5mm.
• Step 2 – Gas cutting ring forming: The principle of equal division circle is adopted, uniform arrangement is adopted, and material loss is minimized.
• Step 3 – Car processing
  • Stack flange welding, the number of flanges according to the length of the drill;
  • Outside diameter According to the drawing size, the inner diameter is +2mm according to the drawing size.
• Step 4 – Drilling: Line or template

Types 3#: Splicing Flange Production

• Step 1 – Determine the width, total length and thickness of the splicing flange:
  • Width: outside diameter – inside diameter +10;
  • Total length: [(outer diameter + inner diameter)÷2+4~5]*3.14;
  • Among them, the correction factor 4~5 is determined by the flange size, and 90 or more is 5mm;
  • Thickness: Drawing flange thickness.
• Step 2 – Determine the number of segments: According to the size of the total length, reasonable discharge is generally divided into 3-5 segments, that is, the total length ÷ (3-5) is the length of each segment.
• Step 3 – Welding: Segmented round, flat welding.
• Step 4 – Flange correction: Welds and weld bead smooth
• Step 4 – Drilling

Further reading:Bending Flat Bar