Method for preparing grinding-free drill head and drill head

Abstract

The invention provides a manufacturing method of a grinding-free drill bit, which comprises a drill body and a detachable cutting blade connected on the front end of the drill body; the manufacturing method is characterized by comprising the following steps: (1) according to the set depth and width, the front end of the drill body is equipped with a spiral groove for holding the cutting blade; both inner side walls of the spiral groove are arcwall faces, and the two arcwall faces are of central symmetry, so that the entire outline of the spiral groove is of S shape; each arcwall surface is a parallelogram after being unfolded; (2) the cutting blade with side walls being two symmetrical arcwall faces and matched with the inner wall shape of the spiral groove is prepared; (3) the cutting blade is placed into the drill spiral groove, and connected to prepare the grinding-free drill bit. No sequence exists between step (1) and step (2). The manufacturing method also provides the grinding-free drill bit prepared by using the method.

Description

technical field [0001] The invention relates to a drill bit, in particular to a preparation method of a wear-free drill bit and the drill bit. Background technique [0002] In the prior art, conventional drill bits, such as twist drills, comprise a cylindrical cutter body provided with at least one helical flute and land, wherein the flute and land follow the helical angle to the front edge. The rear end of the twist drill can be secured, for example, in the chuck of a hand tool or drill press. The cutting edge of the drill bit is generally conical with cutting edges whereby a pair of diametrically opposed cutting edges are bounded by a leading surface of the fluted land and a side of the bit forming the end face of the fluted land. The periphery of each grooved land has at its leading edge a radial protrusion, variously referred to as land, cylindrical land and support edge. The two supporting edges extend the length of the grooved land. [0003] This commonly used drill...

AI Technical Summary

Problems solved by technology

But because the groove section that it is set on the drill body is generally rectangular, and its side wall is a plane, after it is put into cutting head, because the cross section of cutting head is also the rectangle that fits with the groove, its side wall is also Plane, which has inaccurate positioning during assembly, loose connection, and the greater the force of the torque when it is working, the closer to the circumference of the drill body, the smaller the closer to the center of the circle, making the side wall of the groove prone to deformation , damaged, the life of the drill body is not long enough

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