Thin wall drilling bit

Abstract

The present invention is one kind of thin wall drilling bit, and the thin wall drilling bit includes one bit body and one cobalt ring, which are connected through a curved tongue and groove structure to avoid the rotation and axial motion of the cobalt ring relatively to the bit body. The tongue and groove structure increases the welded area and welding binding force, and the bit body and the cobalt ring may be welded with small power laser welding apparatus in low cost. The thin wall drilling bit has high binding strength, long service life, high work efficiency and other advantages.

Description

(1) Technical field: [0001] The invention relates to a drill bit, in particular to a thin-walled drill bit. (two) background technology: [0002] Thin-wall drills are increasingly used in the processing of hard and brittle materials such as glass due to their superior performance such as high efficiency, high output rate, and low power consumption. At present, the diamond thin-walled drill bits at home and abroad generally adopt the traditional high-frequency high-frequency integral hot-press sintering, or the sintered drill ring (or multiple drill teeth) is manufactured by brazing (brazing, silver welding, laser welding, etc.) Welded on the substrate, the joint surface between the substrate and the drill ring is a plane. Due to the huge torque between the base body and the drill ring of the drill bit at high speed, but the base body and the drill ring only rely on the enveloping force (integral sintering) and welding bonding force at the joint surface to resist the huge to...

AI Technical Summary

Problems solved by technology

The plane butt joint concentrates the weakest area on the same plane, which is very unfavorable for reducing torsional deformation (rotating any two sections around the axis)

Moreover, the bonding strength of the traditional high-frequency overall hot-press sintering is not high, and the ability to resist torque is poor; copper, silver brazing and other welding methods, the solder softens at high temperatures, and the welding bonding force is reduced or even completely lost; therefore, in high-speed drilling When cutting, especially when dry drilling, it is easy to cause part of the working ring of the drill bit to fall off and be scrapped, and even cause accidents

In addition, due to the low hardness of the joint between the drill base and the drill ring, grooves are often worn out at the joint during use, which further reduces the joint surface, reduces the torque resistance strength of the joint surface, and causes the drill to be scrapped in advance

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