CN212822922U

CN212822922U - Three-point drill bit

Info

Publication number: CN212822922U
Application number: CN202021722439.2U
Authority: CN
Inventors: 李虎; 吴品
Original assignee: Wuxi Xiuyan Precision Machinery Co ltd
Current assignee: Wuxi Xiuyan Precision Machinery Co ltd
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2021-03-30
Anticipated expiration: 2030-08-17

Abstract

The utility model relates to a drill bit, especially a three sharp drill bits, include: a knife handle; the drill bit is arranged at one end of the cutter handle, a cross blade, a positioning blade, a drilling blade and an auxiliary blade are arranged at the cutting end of the drill bit, the positioning blade is positioned at two sides of the cross blade, and two ends of the drilling blade are respectively connected with the positioning blade and the auxiliary blade; and the reaming cutting edge is positioned below the drilling cutting edge and positioned on the auxiliary cutting edge. The utility model provides a pair of position precision that punches can be guaranteed to three sharp drill bits when punching on the disc to the true circularity in hole is good, the entry in hole does not have the burr with the export.

Description

Three-point drill bit

Technical Field

The utility model relates to a drill bit, especially a three-point drill bit.

Background

When the drill bit punches on the excircle face or the interior disc of stainless steel material, because the harder reason of disc and stainless steel, the drill bit warp when the drill bit is pressed on the disc, takes place the offset easily, especially carries out the eccentric punching on the disc, and the drill bit deflection is great, has influenced the position precision of processing to it is relatively poor to lead to the true circularity of hole. When a common drill bit is used for drilling, burrs are arranged at the inlet and the outlet of the hole.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the utility model provides a can guarantee the position precision who punches when punching on the disc to the true circularity in hole is good, the entry in hole does not have a three pointed drill bit of burr with the export, and concrete technical scheme is:

a tricuspid drill comprising: a knife handle; the drill bit is arranged at one end of the cutter handle, a cross blade, a positioning blade, a drilling blade and an auxiliary blade are arranged at the cutting end of the drill bit, the positioning blade is positioned at two sides of the cross blade, and two ends of the drilling blade are respectively connected with the positioning blade and the auxiliary blade; and the reaming cutting edge is positioned below the drilling cutting edge and positioned on the auxiliary cutting edge.

Through adopting above-mentioned technical scheme, chisel edge and location cutting edge are used for the centering, the drilling cutting edge is used for cutting from the outside, when the drilling cutting edge contacts the work piece earlier, can cut earlier, the poor problem of cutting ability when circumference sword and work piece contact of current drill bit has been solved, thereby avoided leading to when feeding because of the cutting ability is poor to cause the drill bit to warp, the condition of skew takes place in the drilling center, can carry out the centering cutting after chisel edge and location cutting edge and work piece contact, the cutting output has been increased simultaneously, cut in step with the drilling cutting edge, the stability of drill bit has further been improved, drill bit non-deformable. When the chisel edge and the positioning blade are contacted with a workpiece, centering cutting is directly performed, then the drilling blade performs cutting, stable cutting is formed, the drill bit is not easy to deform, the machining precision is high, and the roundness of the hole is good. Because the drilling cutting edge cuts from the outermost side of the hole, the burrs at the inlet and the outlet of the hole are smaller, and the problem that the burrs at the inlet and the outlet of the existing drill bit are larger due to extrusion is solved.

The reaming cutting edge can enlarge the diameter of the hole, so that the hole is formed at one time, the processing efficiency is improved, particularly, the hole with the large diameter and high hole wall quality requirement is processed, a bottom hole is processed through the drilling cutting edge with the small diameter, then the hole is reamed through the reaming cutting edge, and the surface smoothness of the hole wall is good.

Further, the drilling top angle of the drill bit is 120 degrees.

Further, the inner inclination angle of the drilling blade is 10 degrees.

By adopting the technical scheme, the internal inclination angle of 10 degrees can ensure good cutting performance and avoid larger processing amount.

Further, the outer inclination angle of the reaming cutting edge is 45 degrees.

Further, the diameter of the tool shank is larger than that of the drill bit.

Through adopting above-mentioned technical scheme, the great intensity that can improve the drill bit of the diameter of handle of a knife reduces the deflection of drill bit, improves the machining precision.

Further, the three-point drill is made of tungsten carbide.

Compared with the prior art the utility model discloses following beneficial effect has:

the utility model provides a pair of position precision that punches can be guaranteed to three sharp drill bits when punching on the disc to the true circularity in hole is good, the entry in hole does not have the burr with the export.

Drawings

FIG. 1 is a schematic view of a three point drill;

FIG. 2 is an enlarged view of a portion of a tricuspid drill bit;

FIG. 3 is a top view of a tricuspid drill.

Detailed Description

The present invention will now be further described with reference to the accompanying drawings.

As shown in fig. 1 to 3, a tricuspid drill includes: a knife handle 6; the drill bit is arranged at one end of the cutter handle 6, the cutting end of the drill bit is provided with a chisel edge 1, a positioning blade 2, a drilling blade 3 and an auxiliary blade 4, the positioning blade 2 is positioned at two sides of the chisel edge 1, and two ends of the drilling blade 3 are respectively connected with the positioning blade 2 and the auxiliary blade 4; and the reaming cutting edge 5 is positioned below the drilling cutting edge 3, and is positioned on the auxiliary cutting edge 4.

Chisel edge 1 and location cutting edge 2 are used for the centering, drilling cutting edge 3 is used for cutting from the outermost side, when drilling cutting edge 3 contacts the work piece earlier, can cut earlier, the poor problem of cutting ability when circumference sword and work piece contact of current drill bit has been solved, thereby avoided leading to when feeding because of the cutting ability is poor to cause the drill bit to warp, the condition of skew takes place in the drilling center, can carry out the centering cutting after chisel edge 1 and location cutting edge 2 contact with the work piece, the cutting output has been increased simultaneously, cut in step with drilling cutting edge 3, the stability of drill bit has further been improved, drill bit non-deformable. When the chisel edge 1 and the positioning blade 2 are firstly contacted with a workpiece, centering cutting is directly carried out, then the drilling blade 3 carries out cutting, stable cutting is formed, the drill bit is not easy to deform, the processing precision is high, and the roundness of a hole is good. Because the drilling blade 3 cuts from the outermost side of the hole, the inlet and outlet burrs of the hole are smaller, and the problem that the inlet and outlet burrs of the existing drill bit are larger due to extrusion is solved.

The reaming cutting edge 5 can enlarge the diameter of the hole, so that the hole is formed at one time, the processing efficiency is improved, particularly, the hole with large diameter and high hole wall quality requirement is processed, a bottom hole is processed through the drilling cutting edge 3 with small diameter, then the hole is reamed through the reaming cutting edge 5, and the surface smoothness of the hole wall is good.

The drill tip angle a of the drill bit is 120 °.

The inclination angle B of the boring blade 3 is 10 °.

The inner inclination angle of 10 degrees can ensure good cutting performance and avoid larger processing amount.

The outside inclination C of the reamer blade 5 is 45 °.

The diameter of the shank 6 is greater than the diameter of the drill bit.

The drill bit has the advantages that the drill bit strength can be improved due to the fact that the diameter of the cutter handle 6 is large, the deformation of the drill bit is reduced, and machining precision is improved.

The three-point drill bit is made of tungsten carbide.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the claims of the present invention.

Claims

1. A tricuspid drill, comprising:

a knife handle;

the drill bit is arranged at one end of the cutter handle, a cross blade, a positioning blade, a drilling blade and an auxiliary blade are arranged at the cutting end of the drill bit, the positioning blade is positioned at two sides of the cross blade, and two ends of the drilling blade are respectively connected with the positioning blade and the auxiliary blade;

and the reaming cutting edge is positioned below the drilling cutting edge and positioned on the auxiliary cutting edge.

2. The tricuspid drill according to claim 1,

the drill bit has a drill vertex angle of 120 degrees.

3. The tricuspid drill according to claim 1,

the inner inclination angle of the drilling blade is 10 degrees.

4. The tricuspid drill according to claim 1,

the outer inclination angle of the reaming cutting edge is 45 degrees.

5. The tricuspid drill according to claim 1,

the diameter of the shank is greater than the diameter of the drill bit.

6. The tricuspid drill according to claim 1,

the three-point drill bit is made of tungsten carbide.