Slect drill bits according to different applications:

Twist drill general twist drill made of high-speed steel; A deep hole drill usually refers to a tool for machining holes with a ratio of hole depth to aperture greater than 6. Commonly used are gun drill, BTA deep hole drill, jet drill, DF deep hole drill and so on; The reaming drill has 3 to 4 teeth and is used to enlarge the existing hole and improve the machining accuracy and finish. The countersink has more teeth, and the hole end is processed into the desired shape by forming method, which is used to process the countersink hole of various countersink screws, or the outer end face of the flat hole. The drill is used to drill the hole of the shaft workpiece, which is essentially composed of the twist drill and the countersink with a small spiral Angle, so it is also called the composite drill. Hollow drill The middle of the drill pipe is a hollow bit, mainly used for drilling core.

Consider the dimensional accuracy requirements of drilling processing

In general, the smaller the aperture to be machined, the smaller the tolerance. Therefore, it is generally used for hole processing with low precision requirements, or to complete the finishing of the hole by changing the boring blade.

Pay attention to the toughness of the drill

This is also the guarantee that some manufacturers can bring, and in this process, manufacturers can produce better results through a series of good material ratios and some production processes.

Consider the stability of the processing machine

Machine stability is crucial to the safe service life and drilling accuracy of the drill bit, so the working condition of the machine spindle, fixture and accessories needs to be carefully checked. In addition, the stability of the bit itself should also be considered. For example, the integral carbide bit has good rigidity, so high machining accuracy can be achieved. However, the structural stability of carbide indexable blade bit is poor, and it is easy to skew.