The main failure modes of rock drilling button drill bit
The drill bit violently and low impact breaks the rock during rock drilling, thereby achieving the purpose of drilling boreholes in the rock. During use, alloy teeth inevitably collide and rub against rocks, resulting in wear. Wear is a normal failure mode of alloy teeth without fracture. The ultimate failure mode of the drill bit is also due to the wear of the alloy teeth, which makes it impossible to continue drilling rocks and ends. Wear is usually caused by collisions and friction between alloy teeth and rocks during the drilling process. Hard particles in the rock first plow into the softer bonding parts of the alloy teeth, causing them to be worn away first. In the subsequent cutting motion, WC grains that lose their bonding phase protection peel off, thereby grinding off a small part of the alloy teeth. Under the loading of rock drilling machinery, the alloy teeth continuously wear out, and the relative motion and contact area between the alloy and the rock also increase, further accelerating the wear of the alloy teeth.
