Drill with coating at flat base of straight groove, blind hole and single groove
A drill bit and coating technology, applied in drilling/drilling equipment, drill repairing, drilling tool accessories, etc., can solve the problems of mechanical fixed-depth drilling, high drilling force, surface burrs, and short life of the drill bit. Achieve the effect of improving the processing surface burr, strong chip removal ability and improving service life
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[0022] A straight-fluted, flat-bottomed coated blind hole single-fluted drill bit, the structure of which is as follows Figure 1-2 As shown, the rear part of the drill bit is a clamping part 1 with a diameter of 3.175 mm, and the front part is a cutting part. A chip removal groove 2 is arranged on the flank surface of the cutting part. The angle of the large helix angle is 25-30°, and the angle of the large rotation angle in this embodiment is 28°. The cutting edge of the drill bit passes through the center of the drill bit, and the length of the cutting edge is longer than the radius, so as to solve the problem of uneven hole bottom. The drill bit is made of hard alloy material, and the outside is coated with a layer of titanium aluminum nitride (TiAlN) coating. The diameter of the drill bit can be 0.4-3.0 mm, which is used for different cutting occasions. In this embodiment, the diameter of the drill bit is 1 mm, and the total length of the entire drill bit is 38.10 mm.
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