Clogging of workpiece material in grinding wheel means

Explanation:

Grinding

• Grinding is a metal cutting operation performed by means of a rotating abrasive tool, called “grinding wheel”.
• Grinding is the most common form of abrasive machining.
• It is a material cutting process which engages an abrasive tool whose cutting elements are grains of abrasive material known as grit.
• These grits are characterized by sharp cutting points, high hot hardness, chemical stability, and wear resistance.
• The grits are held together by a suitable bonding material to give the shape of an abrasive tool.
• The following terms are related to the grinding operation.

Loading

When soft materials such as aluminium, copper, lead, etc.

\ are ground, the metal particles get clogged in the pores of the wheel. This condition is called loading.

Glazing

When a surface of the wheel develops a smooth and shining appearance, it is said to be glazed. This indicates that the wheel is blunt, i.e. the abrasive grains are not sharp.

Dressing

The purpose of dressing is to restore the correct cutting action of the wheel. Dressing removes the clogs on the surface of the wheel and the blunt grains of the abrasive, exposing the new sharp abrasive grains of the wheel which can be cut and brought to shape efficiently.

Truing

Truing refers to the shaping of the wheel to make it run concentric with the axis. When a new grinding wheel is mounted, it must be dried before use. The cutting surface of a new wheel may run out slightly due to the clearance between the bore and the machine spindle. Grinding wheels, which are in use, also can run out of true, due to uneven loading while grinding.