Method for grinding self-centering drill bit

Abstract

The invention belongs to the technical field of grinding for cutting edges of drill bits, and particularly relates to a method for grinding a self-centering drill bit. The self-centering drill bit is ground by a grinding wheel after being fixed. The method particularly includes steps of adjusting angles among various ground surfaces of the self-centering drill bit and the grinding wheel with a sharp corner; and sequentially grinding a first rear knife face of a knife point, a first rear knife face of a drill point, a second rear knife face of the knife point and a second rear knife face of the drill point of the self-centering drill bit. The method has the advantages that the drill bit is ground by existing common grinding equipment, the practicality is high, and the usage cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of sharpening the cutting edge of a drill bit, in particular to a method for grinding a self-centering drill bit. Background technique [0002] According to the groove type, the drill bit can be divided into two types: straight groove and spiral groove. According to the direction of the helix angle, it can be divided into positive helix angle and reverse helix angle. The helix angle can be large or small according to actual needs. From the tool material, there are cemented carbide, high-speed steel, and welded PCD drills. There are two kinds of handles: straight handle and tapered handle. Most of the current drill bits are cemented carbide straight shank drill bits, because the current tool holders are all fixed in the form of hydraulic pressure, heat expansion and lateral solidification. Only a few special machines still use tapered shank drill bits. According to the top angle of the drill bit, the tradi...

AI Technical Summary

Problems solved by technology

It brings great inconvenience to the sharpening and reuse of tools

The cost of the tool is high, because the tool cannot be repaired by itself after wear and tear, it needs to be assigned to an external unit or returned to the factory for regrinding, and the cost is generally 30% or more of the new knife

It is necessary to pay a high amount of grinding costs, resulting in high tool costs for the enterprise; at the same time, due to the long tool grinding cycle, it is necessary to increase the turnover of the tools so as not to affect the normal use, causing capital occupation for the enterprise and bringing economic losses to the enterprise. loss

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