How are flanges drilled, and how many holes are there for various flanges?

There are two manufacturing methods for the holes in the flange, which correspond to the two manufacturing processes of the flange

1. Free forging. In free forging, the shape of the forging is gradually forged from the blank through some basic deformation processes. The basic processes of free forging include upsetting, lengthening, punching, bending, and cutting.

In this process, the holes in the flange are punched out of the blank with a punch. 】

2. Die forging. Die forging process: blanking, heating, pre-forging, final forging, punching skin, trimming, quenching and tempering.

Shot peening. [In this process, the hole of the flange is reserved by the mold processing. 】<

You can find the center of the flange by placing an iron plate or a wooden board in the inner hole of the flange and drawing a line from the edge of the flange in two directions of about 90° to the center. Then draw the diameter of the circle through the center of the circle, then draw the perpendicular line of this diameter with a right-angle ruler, and then draw the bisector line of the angle from the intersection of the two perpendicular diameters and the 120mm circle, draw the bisector line through the center of the circle to the intersection of the opposite side and the opposite side, and then draw another corner bisector line, you can draw 8 equal divisions. In addition, it is to check the calculation of the circumferential chord length coefficient table of the cutting manual, for example, the coefficient of the equal division of 8 equal parts is, adjust the gauge to this size, and directly go to the circumference of 120mm.

Many flanges with lower pressure ratings are. X0D X0a: The general conventional flanges are 4, 8, 12. Flange is a kind of mechanical product, according to the different needs of customers, or pressure and other factors can be designed as 6 holes, if it is not clear that the other party wants the use of this flange, you can ask the other party for drawings.

The flange is divided into holes with a calculation formula:

1. In the case of circumferential division:

The distance between the two adjacent holes = the diameter of the indexing circle * sin (180 degrees equal fractions) 2, the circumference is unequal

The distance between the two adjacent holes = the diameter of the indexing circle * sin (the angle between the two holes is 2) 3, rectangle:

Diagonal = (square of horizontal distance + square of vertical distance).

What is the calculation formula for each hole of flange punching? 1. The circumference is divided equally: the distance between the two adjacent holes = the diameter of the index circle * sin (180 degrees equal fraction).

2. The circumference is not equally divided: the distance between the two adjacent holes = the diameter of the indexing circle * sin (the angle between the two holes is 2).

3. Rectangle: Diagonal = square root of (square of horizontal distance + square of vertical distance).

The flange is divided into holes with a calculation formula:

1. In the case of circumferential division:

The distance between the two adjacent holes = the diameter of the indexing circle * sin (180 degrees equal fractions) 2, the circumference is unequal

The distance between the two adjacent holes = the diameter of the indexing circle * sin (the angle between the two holes is 2) 3, rectangle:

Diagonal = (square of horizontal distance + square of vertical distance).