WO2022047810A1

WO2022047810A1 - Tool bit for drill bit

Info

Publication number: WO2022047810A1
Application number: PCT/CN2020/113899
Authority: WO
Inventors: 蔡胜永
Original assignee: 浙江东亚工具有限公司
Priority date: 2020-09-02
Filing date: 2020-09-08
Publication date: 2022-03-10
Also published as: CN111911081A

Abstract

The present invention relates to a tool bit for a drill bit, comprising a triangular pyramid, and wing blades extending from the pyramid surface of the triangular pyramid, wherein the included angle between adjoined wing blades is 120°, the tool bit is provided with an end surface used for connecting to a cutting rod, the end surface is orthogonal to ridge lines of the wing blades, the adjoined pyramid surfaces respectively connect to outer blade front surfaces and outer blade back surfaces, the three outer blade back surfaces and the three outer blade front surfaces are each a spiral, the outer blade front surfaces and the pyramid surface of the triangular pyramid are connected and located on the same plane. By means of arranging a triangular pyramid at the center of the tool bit, arranging outer blade front surfaces and outer blade back surfaces that are spirally-distributed on the wing blades, in the initial stage of drilling, a pyramid point of the solid triangular pyramid is used to find the target, once the spiral undergoes a few revolutions, the outer blade further expands a hole dug out by the triangular pyramid, the knife edge of the drill bit is distributed on the triangular pyramid and the wing blades, improving drilling effectiveness. Additionally, the triangular pyramid conducts vertical wall drilling, the outer blade of the wing blades pare down the inner wall of the drilled hole, and the tool bit is not easily worn down.

Description

bit of drill

technical field

The present invention relates to a cutter head of a drill bit.

Background technique

The blade of the traditional drill is in a straight shape, and the end is convergent. When the drill is screwed, the blade is easily worn by the hard wall. This kind of drill bit not only increases the working cost, but also has poor drilling effect.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a drill bit with a simple structure, easy processing, good drilling effect and not easy to wear.

In order to achieve the above purpose, the present invention adopts such a cutter head of a drill bit, which includes a triangular cone and a blade extending from the conical surface of the triangular cone, and the included angle between adjacent blades is 120°. The head has an end face for connecting with the knife rod, the end face is orthogonal to the ridgeline of the blade, and the adjacent conical surfaces are respectively connected to the back of the outer expanded blade and the front of the outer expanded blade, the back of the three outer expanded blades and the three The front surfaces of the outer expanding edges are each in a spiral shape, and the front surfaces of the outer expanding edges are in contact with the conical surface of the triangular pyramid and are located on the same plane. Compared with the prior art, the beneficial technical effect created by the present invention is: by arranging a triangular cone in the center of the cutter head, and arranging vortex-distributed outer-blade front and outer-blade backs on the blade, at the initial stage of drilling, the , first identify the target by the cone point of the solid triangular cone, and after a few turns of screw feeding, the hole drilled by the triangular cone is further expanded by the outer expanding edge, and the drill edge is distributed on the triangular cone and the blade to reduce the The stress on the wall is reduced, the recoil force is reduced, and the drilling efficiency is also improved. In addition, the vertical wall of the triangular cone is drilled, and the inner wall of the drilled hole is cut and expanded by the outer expanding edge on the blade, so that the cutter head is not easy to wear, and the drilling cost is reduced.

In particular, the included angle between the adjacent ridgelines of the triangular pyramid is 94°, and the included angle between the front surface of the outer expanding blade and the back surface of the outer expanding blade is set at 107°. Through the arrangement of the above structure, the drilling and cutting strength of the triangular cone and the outer expanding edge are further ensured, and the wear resistance of the cutter head is improved.

In particular, the end of the blade is provided with a tail edge, the tail edge is provided with a reinforcing block, and the angle between the plane tangent to the front face of the external expanding blade and the reinforcing block is less than 180°. Through the arrangement of the above structure, it is ensured that the outer expanding blade is not easily broken, and the service life of the cutter head is improved.

Particularly, the plane tangent to the front face of the reinforcing block and the outer edge is provided with a chamfer along the length of the edge. Through the arrangement of the above structure, the use performance of the outer expanding blade is further improved.

Description of drawings

1 is a three-dimensional structural diagram of an embodiment of the present invention;

FIG. 2 is a top view of an embodiment of the present invention.

In the figure: 1, triangular cone; 2, blade; 11, tapered surface; 12, the plane tangent to the reinforcement block 22 and the front 110 of the outer edge; 110, the front of the outer edge; 21, the back of the outer edge; 22, Strengthen the block. 120. Chamfering.

detailed description

As shown in Figures 1 and 2, a cutter head of a drill bit includes a triangular cone 1 and a blade 2 extending from the conical surface 11 of the triangular cone 1. The angle between adjacent blades 2 is 120°, The cutter head has an end face for connecting with the cutter bar, the end face is orthogonal to the ridgeline of the blade 2, and the adjacent tapered surfaces 11 are respectively connected to the back face 21 of the outer widening blade and the front face 110 of the outer widening blade, and the back faces 21 of the three outer widening blades. Each of the front surfaces 110 of the outer flared edges is in a spiral shape, and the front surfaces 110 of the outer flared edges are in contact with the tapered surfaces 11 of the triangular pyramid 1 and are located on the same plane.

The included angle between the adjacent ridgelines of the triangular pyramid 1 is 94°, and the included angle between the front surface 110 of the outer edge and the back surface 21 of the outer edge is set at 107°.

The end of the blade 2 is provided with a tail edge, and the tail edge is provided with a reinforcement block 22, and the angle between the plane 12 tangent to the front surface 110 of the outer edge 22 and the front surface 110 of the outer edge is less than 180°.

The plane 12 tangent to the reinforcing block 22 and the front face 110 of the outer edge is provided with a chamfer 120 along the length of the edge.

Claims

A cutter head of a drill bit is characterized in that it comprises a triangular cone and a blade extending from the conical surface of the triangular cone, the included angle between the adjacent blade blades is 120°, and the cutter head has a The end face of the knife rod connection, the end face is orthogonal to the ridgeline of the blade, and the adjacent tapered surfaces are respectively connected to the back of the outer expanded blade and the front of the outer expanded blade, and the back of the three outer expanded blades and the front of the three outer expanded blades are respectively In the shape of a vortex, the front surface of the outer expanding edge is in contact with the conical surface of the triangular pyramid and is located on the same plane.
The cutter head of a drill bit according to claim 1, wherein the included angle between the adjacent ridgelines of the triangular pyramid is 94°, the front surface of the outer edge and the back surface of the outer edge are The included angle is set at 107°.
The drill bit according to claim 1 or 2, characterized in that: the end of the blade is provided with a tail edge, the tail edge is provided with a reinforcing block, and the reinforcing block is tangent to the front of the outer expanding edge. The angle between the plane and the front of the outer edge is less than 180°
The cutter head of the drill bit according to claim 3, characterized in that: the plane tangent to the front surface of the reinforcing block and the outer edge is provided with a chamfer along the length of the edge.