Michae
Posts 6
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The chisel edge of the drill is located near the central axis of rotation The chisel edge has a large secondary rake angle no chip space and low cutting speed so it will DHD Drill bit produce a large axial resistance If the chisel edge is ground to Type A or Type C in DIN1414 and the cutting edge near the central axis has a positive rake angle the cutting resistance can be reduced and the cutting performance can be significantly improved According to the shape material structure and function of the workpiece the drill bit can be divided into many types such as high-speed steel drill bit (twist drill group drill flat drill) solid carbide drill bit indexable shallow hole drill deep hole drill trepanning drill and interchangeable head drill bit 2
At the same time the short scrap iron makes the coolant flow to the drill tip more easily which further improves the heat dissipation effect and cutting performance in the processing process Moreover because the new chip-breaking edge penetrates the whole groove of the drill bit it can still maintain its shape and function after many times of dth hammer bit grinding In addition to the above functional improvements it is worth mentioning that the design strengthens the rigidity of the drill body and significantly increases the number of holes drilled before a single grinding III Drilling accuracy The accuracy of the hole is mainly composed of the hole size position accuracy coaxiality roundness surface roughness and hole burr
For cemented carbide drill the cutting edge has a large chamfer in the negative rake angle direction and the optional range of feed per revolution is smaller than that of high-speed steel drill If the feed per revolution exceeds this range during machining the service life of the drill will be reduced Because the heat resistance of cemented carbide drill is higher than that of high speed steel drill the rotary speed has little effect on the life of the drill so the method of increasing the rotary speed can be used to improve the processing efficiency of cemented carbide drill and ensure the life of the drill Borehole Drill Bits Rational use of cutting fluid
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