A. Material Category of Drill Bit
The material of the drill bit is generally divided into HSS, HSS containing cobalt, powder HSS and tungsten steel drill bit. The hardness of the above drill bit materials increases step by step. Under normal circumstances, it depends on whether the drill bit can drill the moving workpiece or wear resistance. The hardness of the drill bit and the hardness of the workpiece can be converted into HV Wechsler hardness. If the hardness of the drill bit is more than 3 times that of the workpiece, the bit is ok to be used on the workpiece. Of course, the surface hardness of the drill bit is greater than that of the workpiece. The higher the surface hardness, the better, and the longer the service life of the drill bit
B. Material Selection of Drill Bit
1) Drill holes on wood materials and use woodworking drill bits together. The sales volume of woodworking drill bits is large, and the requirements for tool hardness are not high. The tool material is generally general high speed steel (HSS).
2) Drill holes in general metal materials (alloy steel, non-alloy steel, cast iron, cast-steel, non-ferrous metal) and use metalworking bits. The material of the bits is generally high-speed steel (high-grade tools contain element cobalt HSS CO).
3) When drilling holes in concrete and stone materials, the impact drill is used together with the masonry bit, and the cutter head is generally made of cemented carbide.
4) Ceramic tile drill bits are used for drilling holes on ceramic tiles and glass with higher hardness. The tool material is tungsten carbon alloy. Due to the high hardness and poor toughness of the tool, attention should be paid to the use of low speed and no impact.
Post time: Nov-06-2021