Shot Peening Process and its Applications

Shot peening: 

In this process, we use shot (small balls made of castiron, steel, aluminium or ceramics sometimes depend upon the job requirements) that travel at a high speed and strike with the surface of job to do plastic deformation on the surface Due to that indentation occurs on the surface of the job, the localized compressive surface is formed which helps to prevent crack on its surface and increase its ability to retain oil.

How Shot peening is done?

To do the shot peening process we need special equipment. It consists of workpiece chamber in which our job/workpiece is held so when shot strikes on the surface after that it does not go any unwanted place. A shot blasting device whose purpose to throw the shots at very high speed (Air nozzle and centrifugal wheel type are normally used)

Air Nozzle Blasting device: In this, we use air at very high pressure (6 to 8atm compressed air) to throw the shots at the workpiece.

Centrifugal Wheel Blasting device: In this, no air is used for the shot peening process. In this we use a wheel mechanism and centrifugal force to throw shot in the workpiece chamber this method is preferred for heavy and big jobs

Advantage of Shot Peening Process

• Increase the life of the product
• Help to reduce the cracking the surface of the product
• Increase oil retaining capacity of the job
• Roughly machined workpiece becomes finer as compare to finish machined surface coarser

Application of Shot peening Surface:

• Torsion bar
• Leaf Spring shot peening increase its life considerably
• Gear teeth roots after carburizing
• Case hardening