How to determine the mass of a forging from a drawing?

An accurate calculation of the weight of rolled metal according to the drawing is necessary for accounting, as well as determining storage and transport costs. In addition, this will allow the buyer to determine whether the product claimed by the manufacturer is true.

Forgings can be different config. To accurately calculate the mass of such a workpiece, it is necessary to know two parameters: the density of the steel from which it is made, as well as the volume of the product. And if the density of steel can be found from metallurgical reference books, then the volume is easy to determine from the drawing. It is equal to the sum of the volumes of different parts of the product:

V_til = V₁ +V₂ + V₃ +…+ V_n.

Most often, forgings are of round or rectangular cross-section, so below are the options for calculating the volume for such products. So, the volume of a part of a forging of circular cross section is found by the formula for the volume of a cylinder:

V = πr²h,

where r – radius (half diameter), h – product length.

If the part is rectangular (or with rectangular parts), then the volume is equal to the product of the sides of the section and the length of the product:

V = abh,

where a and b &ndash ; section sides (for square profile a = b), h – forging length. All these values must be indicated on the drawing.

If there are holes in the forging, their volume must also be calculated in a similar way, and then subtracted from the total volume.

Finally, we determine the total volume of the forging and calculate the mass of the product from it:

m = ρV_pok,

where ρ – specific gravity of steel.