How to calculate the cutting of 90 elbow

How to calculate the cutting of 90 elbow

The company mainly according to the requirements of customers to produce a variety of different types and materials of elbow pipe fitting, in the production of production using the following calculation method.

The lofting of 90 elbow is also an important knowledge learned by many people. For the blanking of 90 degree elbow pipe fittings,

Diameter 300MM, bending 90 degrees, such feeding: draw a straight line length is (D-TD -- round pipe diameter, T -- plate thickness)

Divide the line segment 16 equally, from 0.1.2.3...... 16. Calculation formula for lofting two equal straight elbow: Yn= R cosα When 0°≤αn≤90° Yn=1/2(D-2T)cosα

When the 90 ° & lt; Alpha n, 180 ° or less Yn = 1/2 dcos alpha

In the formula, Yn-- the equal point of the circumference length of the expanded graph to the coordinate value of the curve;

R -- circle radius;

D -- Outer diameter of round pipe;

T - thickness;

α N -- circular bisecting Angle; 300mm diameter pipe,

N optional 16 alpha 1 = 16 = 22.5 ° 360 ° / 45 ° alpha 2 = alpha 3 = 67.5 ° alpha 4 = = 112.5 ° 90 ° alpha 5 alpha 6 = 135 °. Alpha 7 8 = = 157.5 ° alpha 180 °

Calculation formula: Y0=1/2(d-2t)cos0°=0.5(d-2t)

Y1 = 1/2 (d - 2 t) cos22.5 ° = 0.4619 (d - 2 t)

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