Single-lip drill
A single-edged drill bit and drill bit technology, which is applied in the direction of drill repair, drilling tool accessories, drilling/drilling equipment, etc., can solve the problems of not being able to maintain the original function for a long time, insufficient blade tip strength, and loss of adhesion. Achieves the effect of suppressing chipping or breakage of the chisel edge, preventing unstable adhesion, and stabilizing adhesion
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[0034] The following is based on the attached Figure 1-7 Embodiments of the present invention will be described. Figure 1 to Figure 6 A single-edged drill according to the first embodiment is shown. Each figure is enlarged for easy understanding. The drill 1 has a main body 2 integrally formed with a shank (not shown), a cutting edge 3 is formed at the front end of the main body 2, and a chip discharge groove 4 is formed on the main body. The chip discharge groove 4 is preferably a spiral groove as shown in the figure. The main cutting edge portion 3 a of the cutting edge 3 is located just past the center (in front of a line Y passing through the axis O in the drill rotation direction). In addition, the rotation direction of the drill bit in the present invention refers to the forward rotation direction of the drill bit.
[0035] In addition, in this drill 1, the relief portion at the front end is formed by a plurality of stages of relief surfaces. In the first embodime...
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