After the high speed steel is heated to red, the shape of
Twist Drill can be quickly rolled out in one time. The subsequent heat treatment and surface treatment of twist drill can be used for cutting the head.
The biggest advantage of this process is high production efficiency, can make full use of raw materials; The internal structure of the processed bit body has fiber continuity, grain refinement, uniform carbide distribution and high red hardness.
But the rolling process also has obvious defects, that is, the bit body is easy to crack, or there will be some cracks that are not easy to detect, and because it is a one-time molding, the overall precision of the bit will not be particularly high.
At present, the twist drill on the work is generally used in this way of processing, but the general rolling twist drill factories are not on the work of this level of technology, so the foreign trade market are mainly in the middle and low grade rolled twist drill.
