2018 Latest Article: 3 Axial Fan Flange Fabrication Processes-Blog_Borisbang Industrial Technology (NBIT) China

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Angle Bending Machine >>News >> 2018 Latest Article: 3 Axial Fan Flange Fabrication Processes

2018 Latest Article: 3 Axial Fan Flange Fabrication Processes



1. Angle Bending Machine Rolling Flange Fabrication Process

General fan flange production adopts the method of rolling and processing with Angle Bending Machine



1.1 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.

1.2 Pre-bending pressure head

Pay attention to the sharp corner must be cut flat

1.3 roll flange

Angle Bending Machine rolled, with card template to correct the curvature of the circle.

1.4 Shaping

Flange face straight

1.5 welding

1.5.1 Before welding, leave about 2mm welding seam at the flange joint;
1.5.2 After welding, the surface weld bead is polished and smoothed.

1.6 car processing

1.6.1 stack flange welding, the number of flanges according to the length of the drill;
1.6.2 Outside diameter According to the drawing size, the inner diameter is +2mm according to the drawing size.

1.7 Drilling

Line or template

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.
In Fig. 2, flange 1 is cut, flange 2 is cut, and so on.



1.1 Determine the inner diameter and outer diameter of the flange

Inner diameter: Drawing size + 5mm; Outside diameter: Drawing size + 5mm.

1.2 Gas cutting ring forming

The principle of equal division circle is adopted, uniform arrangement is adopted, and material loss is minimized.

1.3 Car processing

1.3.1 stack flange welding, the number of flanges according to the length of the drill;
1.3.2 Outside diameter According to the drawing size, the inner diameter is +2mm according to the drawing size.

1.4 Drilling

Line or template


3. Splicing flange production



Fig. 3, the method of adopting segmented circular arc gas cutting for flanges with large wall thickness and not very high requirements for flange planes:

1.1 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.

1.2 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.

1.3 Welding

Segmented round, flat welding.

1.4 Flange correction

Welds and weld bead smooth


1.5 drilling

Line or template