By which forging method are bolts produced?

Question

Question

This question was previously asked in

ALP CBT 2 Fitter Official Paper: Held on 21 Jan 2019 Shift 2

Answer 1

Explanation:

Forging is a process in which material is shaped by the application of localized compressive forces exerted manually or with power hammers, presses, or special forging machines.
The process may be carried out on materials in either hot or cold state.
Typical forged parts include rivets, bolts, crane hooks, connecting rods, gears, turbine shafts, hand tools, railroads, and a variety of structural components used to manufacture machinery.
The forged parts have good strength and toughness; they can be used reliably for highly stressed and critical applications.
Upset forging involves increasing the cross-section of material at the expense of its corresponding length. Examples of upset forged parts are fasteners, bolts, valves, nails, and couplings..

Important Points

Press forging:

Press forging, which is mostly used for forging of large sections of metal, uses a hydraulic press to obtain slow and squeezing action instead of a series of blows as in drop forging.
The continuous action of the hydraulic press helps to obtain uniform deformation throughout the entire depth of the workpiece. Therefore, the impressions obtained in press forging are cleaner.