Wing-shaped hard alloy fixed drill bit with blade, oblique planes and jackscrews

Abstract

The invention provides a wing-shaped hard alloy fixed drill bit with a blade, oblique planes and jackscrews. The wing-shaped hard alloy fixed drill bit is characterized in that the front of the blade is in the shape of a combination of two wings of an airplane, the rear of the blade is in the shape of a combination of two empennages of the airplane, the blade is positioned on a cutter by the aid of two symmetrical side surfaces of the rear of the blade, the two side oblique planes are arranged at the rears of two wings of the blade and are axially symmetrically distributed, the corresponding oblique planes are arranged at the fronts of two side empennages of the blade relative to the rears of the two side empennages, a straight slot and a groove are formed in the front of the cutter and are used for positioning the blade on the cutter, and the corresponding oblique plane is arranged at the bottom of the straight slot, is meshed with the oblique planes at the rears of the two wings of the blade and is used for locking the blade and the cutter; screw holes are formed in two side surfaces perpendicular to the groove and are connected with the two fastening jackscrews; the oblique planes on two sides of the front of each empennage of the blade are jacked by the two side jackscrews, so that the oblique planes at the rears of the two wings of the blade can be firmly meshed with the cutter, and the blade and the cutter can be fastened. The wing-shaped hard alloy fixed drill bit has the advantages that the wing-shaped hard alloy fixed drill bit is light in piece weight, simple in structure, high in positioning precision, good in rigidity and long in service life, is not easy to deform and is high in stability during usage, a firm and reliable clamping effect can be realized, the blade can be replaced conveniently and quickly, and the like.

Description

technical field [0001] The invention relates to a cemented carbide drill bit, in particular to a wing-shaped cemented carbide blade inclined top wire clamping drill bit. Background technique [0002] The basic types of cemented carbide drills can be divided into the following categories: solid carbide drills, carbide indexable insert drills, welded carbide drills, replaceable carbide crown drills, replaceable insert hard Alloy drill. Each has its advantages in specific applications, but at the same time there are disadvantages: solid carbide drills are brittle and expensive; indexable drills have better cost performance, but the cutting edge is asymmetrical, and the drilling process Subsequent reaming or boring must be carried out afterwards; welded carbide drills are prone to cracks after welding, and the quality of the drill is very unstable; the replaceable crown drill is a new generation of drilling tools developed in recent years, produced by different manufacturers T...

AI Technical Summary

Problems solved by technology

Each has its advantages in specific applications, but at the same time there are disadvantages: solid carbide drills are brittle and expensive; indexable drills have better cost performance, but the cutting edge is asymmetrical, and the drilling process Subsequent reaming or boring must be carried out afterwards; welded carbide drills are prone to cracks after welding, and the quality of the drill is very unstable; the replaceable crown drill is a new generation of drilling tools developed in recent years, produced by different manufacturers The structure of the crown bit is also slightly different, but the common feature is that the structure of the crown and the cutter body is relatively complex, the cost is high, and the assembly is not easy. The positioning and clamping of the blade occupies the space of the cutter body axis, which affects the rigidity of the cutter body. The structure of the replaceable carbide drill bit is also subject to certain restrictions; in recent years, many companies have developed a variety of new structures. The more representative drill bit is: NEOME insert drill bit. There are positioning grooves, positioning holes are set on the cutter body, the pin shaft is used to connect the blade and the cutter body is positioned, and a fixing hole is opened on both sides of the blade, and the blade and the cutter body are fastened by screws

Its disadvantages are: the clamping is not reliable enough, it is not suitable to bear large radial force, when drilling on irregular surface, the drill-in and drill-out will easily cause the blade to shift and other problems

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