Stainless steel is a difficult material to machine, and its cutting performance is very poor, which causes great friction on the drill bit. Therefore, the drill bit for drilling stainless steel needs heat-resistant and wear-resistant materials, and the cutting edge of the NC tool must be sharp. Therefore, it is not practical to use the general Fried Dough Twists drill, but it is better to use the carbide drill bit and the stainless steel chip breaking drill bit.
The advantage of hard alloy drill bits is that they have no transverse edges and can reduce axial force by 50%. The front angle of the drill center is positive, the cutting edge is sharp, and the thickness of the drill center increases, improving the rigidity of the drill bit. The distribution of the circular cutting edge and chip discharge groove is reasonable, making it easy to cut chips into small pieces.
It is relatively suitable to use a hard alloy drill bit to drill stainless steel. If there is no hard alloy drill bit, a regular drill bit can also be used for drilling. However, it is important to note that the rotational speed should be lower during drilling, and the back corner of the drill bit should be ground larger and the side edge should be narrowed, which can reduce the friction between the side edge and the hole wall. In addition, when drilling, you can add some vinegar to the drill bit, which will make it easier to drill the hole.
The straightness of the hard alloy drill hole is good, and the cutting length is short. There are multiple pit shaped chip breaking grooves on the front face of the blade, which has good cutting performance, especially reliable chip breaking. The chips are in a consistent form of broken and curled chips.
Internal cooling allows the cutting fluid to be directly sprayed onto the drilling surface, improving the cooling effect and ensuring smooth chip removal. Especially, aluminum blades of different grades can be used according to the workpiece material, with a cutting speed of 80-120m/min, making drilling relatively light and fast.
