milling machine's tool bit break so easily

milling machine's tool bit break so easily and why not?

Firstly, the milling machine tool bit tends to lose its cutting edge because of built-up edge and cannot machine efficiently. Since the workpiece starts to push on the tip of the tool bit, the tool bit will deflect slightly. The increase in tool deflection and also the stress generated through the Drilling milling machine with every rotation will eventually cause the breakage of the tool bit. This process can also be called extensive stress-related breakage.

Secondly , when metal is removed by machining, there's a substantial increase in the particular energy required as the chip thickness decreases. This means that regarding Vertical milling machine, as the chip gets thinner with smaller depths of cut, the micro tool bit is going to be subject to greater resistance in comparison with conventional machining. It is as if the workpiece material becomes harder during micro machining. This resistance force is sufficiently strong to exceed the bending strength limit of the vertical milling machine tool bit before the tool experiences any significant wear, and leads to the breakage from the tool bit. One method to prevent this really is to make the chip thickness small compared to the edge radius from the tool bit.

Third, a sharp rise in cutting forces and stress from chip clogging during the Universal milling machine process would make the tool bit to break. In many micro milling operations using miniature micro tool bit with two cutting edges, each leading edge removes the chips in the machining area only within half a rotation. However, if chip clogging occurs, the cutting forces and stresses will increase beyond the bending strength limit of the tool bit inside a few tool rotations, and the milling machine  tool bit will break. Some users prefer high-speed steel tool bits because these are very a lot more flexible and tolerate clogging better than carbide tool bits.