How the carbide button installed into the tapered button bit

How the carbide button installed into the tapered button bit

There are three general methods for fixing the carbide button drill bits, namely welding, cold fixing and hot inserting. The welding process for the supply of tapered button bit is an earlier tooth fixing process. Its method is relatively simple. It is mainly to determine the size of the hole and the alloy cylindrical tooth through the welding gap, drill the corresponding hole on the bit body according to the structural form of the bit, and then weld the alloy carbide button on the bit body by brazing or silver welding. The requirements for drilling accuracy and cylindrical tooth size are not high. Its disadvantage is that it is relatively difficult to operate, It is easy to leave welding scar to affect the appearance, and it is easy to lack welding. The welding strength is not high, and the service life of the button bit is low. 

Tapered button bits are mostly used to produce tapered hole connection small diameter tapered button drill bits, which have been phased out. The cold fixing process is currently adopted by most enterprises. The key point of the process is to calculate the fit clearance between the hole and the tungsten carbide according to the yield of the steel used for the drill bit body. The carbide buuton is pressed into the hole by external force using the interference fit method. Its characteristics are that the process is easy to master, the production efficiency is relatively high, but the stability is lacking.