BALLIZING

BALLIZING

INTRODUCTION:

Drilling is operation producing a cylindrical hole by removing metal by retracting edge of cutting tool called as drill. At the starting of drilling we locate the hole center then punch it with the help of center punch and drilling operation is completed but drilling does not produces an accurate hole which we want that mean hole is always slightly oversize than the drill size because of vibration of spindle and drill.

In manufacturing there are numbers of finishing operation such as grinding, forming, reaming, burnishing, honing and the ballizing also one option for these processes, which is best & economical.

In ballizing process we use a tungsten carbide ball, which is precise in shape & size. This precise ball is pushed to a hole with help of standard sized known as push rod. In this process there is no removing of metal. With help of this ball when we push the ball in a hole the grain structure of inner surface of hole is change & compressed the metal & large amount of plastic flow take place. Plastic flow is causing a large increase by yield stress. In ball bore interference we use a soap lubricant because of this reduction in ballizing load is possible.

for more info visit.
http://www.enjineer.com/forum