CN212359635U

CN212359635U - Bit of drill

Info

Publication number: CN212359635U
Application number: CN202021885155.5U
Authority: CN
Inventors: 蔡胜永
Original assignee: Zhejiang Dongya Facility Co ltd
Current assignee: Zhejiang Dongya Facility Co ltd
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2021-01-15
Anticipated expiration: 2030-09-02

Abstract

The utility model relates to a tool bit of drill bit, including the triangular pyramid to and the wing that extends out by the conical surface of triangular pyramid, contained angle is 120 between the adjacent wing, and the tool bit has the terminal surface that is used for being connected with the cutter arbor, and the crest line quadrature of terminal surface and wing, adjacent conical surface connect out respectively and expand the sword back outward and expand the sword openly outward, and the sword back is expanded respectively outward with the three sword openly and is the vortex shape outward, expands the sword openly outward and meets and lie in the coplanar with the conical surface of triangular pyramid. Set up the triangular pyramid through the center at the tool bit, set up on the wing and be the outer sword front that expands that the vortex distributes and expand the sword back outward, at the drilling initial stage, aim at by the awl point of firm triangular pyramid earlier, several rings of back are fed to the spiral, further enlarge by the hole that the sword bored to the triangular pyramid that expands outward, distribute the drill bit cutting edge on triangular pyramid and wing, improved drilling efficiency. In addition, the triangular cone is used for drilling holes vertical to the wall surface, the outer expanding blades on the blades are used for expanding the inner wall of the drilled holes, and the tool bit is not easy to wear.

Description

Bit of drill

Technical Field

The utility model relates to a tool bit of drill bit.

Background

The cutting edge of the traditional drill bit is in a straight line shape, the end part is converged, and the cutting edge is easily worn by a hard wall surface when the drill bit is spirally fed. The drill bit not only increases the working cost, but also has poor drilling effect.

Disclosure of Invention

In view of this, the present invention provides a bit of a drill bit with simple structure, easy processing, good drilling effect and less wear.

In order to realize above mesh, the utility model discloses a tool bit of such drill bit, including the triangular cone to and the wing of extending out by the conical surface of triangular cone, the contained angle is 120 between the adjacent wing, the tool bit have and be used for the terminal surface be connected with the cutter arbor, the crest line quadrature of terminal surface and wing, adjacent conical surface connects out respectively and expands the sword back outward and expand the sword openly outward, the sword back is expanded outward three outward and the sword is expanded openly outward and is the vortex shape separately with three, the outer conical surface that expands the sword openly and triangular cone meet and be located the coplanar. Compared with the prior art, the utility model discloses the beneficial technological effect who creates lies in: set up the triangular pyramid through the center at the tool bit, set up on the wing and be the outer sword front and the outer sword back that expands that the vortex distributes, at the drilling initial stage, aim at by the awl point of firm triangular pyramid earlier, several rings of back are fed to the spiral, further enlarge by the hole that the sword bored to the triangular pyramid that expands outward, distribute the drill bit cutting edge on triangular pyramid and wing, have reduced the stress of wall, and recoil has reduced, has also improved drilling efficiency. In addition, the triangular cone is used for drilling holes perpendicular to the wall surface, the outer expanding blades on the blades are used for expanding the inner wall of the drilled hole, the tool bit is not easy to wear, and the drilling cost is reduced.

Particularly, an included angle between adjacent ridge lines of the triangular cone is 94 degrees, and an included angle between the front surface of the outer expanding edge and the back surface of the outer expanding edge is 107 degrees. Through the arrangement of the structure, the drilling and cutting strength of the triangular cone and the outward-expanding blade is further ensured, and the wear resistance of the cutter head is improved.

Particularly, the tail end of the blade is provided with a tail blade, the tail blade is provided with a reinforcing block, and the included angle between the plane tangent to the front face of the outward expanding blade and the front face of the outward expanding blade is smaller than 180 degrees. Through the arrangement of the structure, the outer expanding edge is guaranteed not to be broken easily, and the service life of the cutter head is prolonged.

In particular, the tangent plane of the reinforcing block and the front surface of the outward-expanding edge is provided with a chamfer angle along the edge length. Through the arrangement of the structure, the use performance of the outward expanding blade is further improved.

Drawings

FIG. 1 is a perspective view of an embodiment of the present invention;

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

In the figure: 1. a triangular cone; 2. a blade; 11. a conical surface; 12. a plane tangent to the stiffener 22 and the flared blade face 110; 110. the front surface of the outward expanding blade; 21. the back of the outward expanding edge; 22. and a reinforcing block. 120. And (6) chamfering.

Detailed Description

As shown in fig. 1 and 2, a tool bit of a drill comprises a triangular cone 1 and blades 2 extending from a conical surface 11 of the triangular cone 1, wherein an included angle between adjacent blades 2 is 120 °, the tool bit has an end surface for connecting with a tool holder, the end surface is orthogonal to a ridge line of the blades 2, the adjacent conical surfaces 11 are respectively connected with an outer expanding blade back surface 21 and an outer expanding blade front surface 110, the three outer expanding blade back surfaces 21 and the three outer expanding blade front surfaces 110 are respectively in a vortex shape, and the outer expanding blade front surfaces 110 are connected with the conical surface 11 of the triangular cone 1 and are located on the same plane.

The included angle between the adjacent ridges of the triangular cone 1 is 94 degrees, and the included angle between the front surface 110 of the outer expanding edge and the back surface 21 of the outer expanding edge is 107 degrees.

The tail edge is arranged at the tail end of the blade 2, the tail edge is provided with a reinforcing block 22, and the included angle between the plane 12 tangent to the front face 110 of the outward expanding blade and the front face 110 of the outward expanding blade is less than 180 degrees.

The plane 12 tangent to the stiffener 22 and the flaring front face 110 is chamfered 120 along the length of the edge.

Claims

1. A cutter head of a drill bit, characterized in that: the cutter comprises a triangular cone and blades extending out from the conical surface of the triangular cone, wherein an included angle between every two adjacent blades is 120 degrees, the cutter head is provided with an end surface used for being connected with a cutter bar, the end surface is orthogonal to the ridge line of the blades, the adjacent conical surfaces are respectively connected with the back surface of an outer expanding blade and the front surface of an outer expanding blade, the back surfaces of the three outer expanding blades and the front surfaces of the three outer expanding blades are respectively in a vortex shape, and the front surfaces of the outer expanding blades are connected with the conical surface of the triangular cone and are positioned on the same plane.

2. The cutter head of a drill according to claim 1, wherein: the included angle between the adjacent ridge lines of the triangular cone is 94 degrees, and the included angle between the front surface of the outer expanding blade and the back surface of the outer expanding blade is 107 degrees.

3. The cutter head of a drill according to claim 1 or 2, wherein: the tail end of the blade is provided with a tail blade, the tail blade is provided with a reinforcing block, and the included angle between the plane tangent to the front face of the outward expanding blade and the front face of the outward expanding blade is smaller than 180 degrees.

4. The cutter head of a drill according to claim 3, wherein: and a chamfer is arranged on the tangent plane of the reinforcing block and the front surface of the outward-expanding blade along the edge length.