CN214236428U

CN214236428U - Two-edge drill bit with asymmetric supporting edge zone

Info

Publication number: CN214236428U
Application number: CN202120098124.3U
Authority: CN
Inventors: 谢叶飞
Original assignee: Astor Precision Tools Shanghai Co ltd
Current assignee: Astor Precision Tools Shanghai Co ltd
Priority date: 2021-01-14
Filing date: 2021-01-14
Publication date: 2021-09-21
Anticipated expiration: 2031-01-14

Abstract

The utility model discloses a two-edge drill bit with an asymmetric supporting cutting edge, which comprises a drill bit body, wherein the drill bit body comprises a handle part, a cutting part and a drill point, and the cutting part is provided with two asymmetric spiral grooves; the spiral groove comprises a first spiral groove and a second spiral groove, a first cutting edge is formed by the wall surface of the first spiral groove facing to the rotation direction and the outer wall of the edge part, and a first edge zone and a first cutting back are sequentially arranged on the back of the first cutting edge; the wall surface of the second spiral groove facing to the rotating direction and the outer wall of the edge part form a second cutting edge, and the back of the second cutting edge is sequentially provided with a second cutting edge zone, a second carving back and a third cutting edge zone. The utility model discloses a set up asymmetric three support margin, support the radial force that the margin received not on a straight line, every 180 offsides that support the margin is empty cutter body clearance, and the drill bit can give way a little in 180 orientations, has avoided high-speed friction, improves wear resistance, increase of service life.

Description

Two-edge drill bit with asymmetric supporting edge zone

Technical Field

The utility model relates to a drill bit especially relates to a two sword drill bits with asymmetric support margin.

Background

Most two sword drill bits on the existing market adopt the design of symmetry margin, advantage: simple manufacture, easy grinding and good drill rigidity. The disadvantages are as follows: because the supporting blade zones are designed by 180 degrees of symmetry, the radial forces borne by the two symmetrical supporting blade zones are on the same straight line in the machining process, the forces are theoretically equal in magnitude and opposite in stress direction, so the stress is balanced, and because the stress is balanced, the drill bit can be stably supported in the machining process, but because the drill bit rotates around the central axis of the cutter at high speed in the machining process, the two supporting blade zones of the drill bit play a mutual supporting role in a machined hole, meanwhile, because of high-speed rotation, the supporting blade zones bear great friction force, high-speed friction can generate high heat, the two symmetrical supporting blade zones can generate high temperature along with the machining process, because the drill bit machining is usually continuous in machining, the supporting blade zones are mutually stressed and pushed, but because of symmetrical distribution, no actual yielding space exists, therefore, the blade is always in a high-speed friction state with the hole wall, the generated heat enables the blade to be quickly softened, the hardness is reduced, and the rapid abrasion of the blade is caused. When the margin is worn rapidly, the support performance of the drill bit is rapidly reduced, and the service life of the drill bit is shortened. Accordingly, the prior art is yet to be improved and developed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a two sword drill bits with asymmetric support margin are provided, solve current two sword drill bits and support the setting of margin symmetry, lead to the rapid wear of margin, influence the problem in drill bit life-span.

The technical scheme adopted by the utility model for solving the technical problems is to provide a two-edge drill bit with an asymmetric supporting cutting edge zone, which comprises a drill bit body, wherein the drill bit body comprises a handle part, a cutting part and a drill point, the cutting part is provided with two asymmetric spiral grooves, the spiral grooves and the outer wall of the cutting part form cutting edges, and the spiral grooves form end edges at the drill point; two chip grooves are formed in the drill tip, and chip groove blades are formed by the chip grooves and the drill tip; the spiral groove comprises a first spiral groove and a second spiral groove, a first cutting edge is formed by the wall surface of the first spiral groove facing to the rotation direction and the outer wall of the edge part, and a first edge zone and a first cutting back are sequentially arranged on the back of the first cutting edge; the wall surface of the second spiral groove facing to the rotating direction and the outer wall of the edge part form a second cutting edge, and the back of the second cutting edge is sequentially provided with a second cutting edge zone, a second carving back and a third cutting edge zone.

Further, the included angle between the first blade edge and the second blade edge ranges from 190 degrees to 194 degrees, and the included angle between the first blade edge and the third blade edge ranges from 86 degrees to 90 degrees.

Furthermore, the wall surface of the first spiral groove facing to the rotation direction and the drill tip form a first end cutting edge, and the wall surface of the second spiral groove facing to the rotation direction and the drill tip form a second end cutting edge.

Furthermore, the chip flutes comprise a first chip flute and a second chip flute, the first chip flute is communicated with the first spiral flute, the second chip flute is communicated with the second spiral flute, the first chip flute and the drill tip form a first chip flute edge, and the second chip flute and the drill tip form a second chip flute edge.

Further, the first chip containing groove edge is in arc transition connection with the first end edge; and the second chip containing groove edge is in arc transition connection with the second end edge.

Further, the first chip flute and the second chip flute divide the drill tip into a first end face and a second end face, and the first end face and the second end face are connected at the center of the drill tip through a chisel edge.

The utility model discloses contrast prior art has following beneficial effect: the utility model provides a two sword drill bits with asymmetric support margin, through the three support margin of asymmetric setting, in high-speed course of working, the radial force that the support margin received is not on a straight line, 180 offsides of every support margin are empty cutter body clearance, therefore, the drill bit is when the actual high-speed processing is rotatory, because of the atress reason, the drill bit can give off a little in 180 directions, avoided high-speed friction, reduced thermal production, the margin can keep original hardness for a long time, keeps the wearability; the linear speed can be continuously improved on the basis of the conventional linear speed without increasing the abrasion of the blade area, and the service life of the cutter is prolonged while the efficiency is improved.

Drawings

FIG. 1 is a schematic view of a two-edged drill with asymmetrically supported lands according to an embodiment of the present invention;

fig. 2 is a side view of a two-edged drill with asymmetrically supported lands in accordance with an embodiment of the present invention.

In the figure:

1. a handle; 2. a blade part; 3. drilling a tip; 4. a helical groove; 5. a cutting edge; 6. an end blade; 7. a chip pocket; 8. a chip containing groove blade; 9. a first land; 10. a first back carving; 11. a second land; 12. secondly, back carving; 13. a third margin; 14. a first end face; 15. a second end face; 16. a chisel edge; 41. a first helical groove; 42. a second helical groove; 61. a first end blade; 62. a second end blade; 71. a first chip pocket; 72. a second chip pocket; 81. a first chip-containing groove edge; 82. and a second chip containing groove edge.

Detailed Description

The invention is further described with reference to the following figures and examples.

Fig. 1 is a schematic structural view of a two-edge drill with an asymmetrically supported margin according to an embodiment of the present invention.

Referring to fig. 1, the two-edge drill with the asymmetric supporting margin according to the embodiment of the present invention includes a drill body, the drill body includes a shank 1, a cutting portion 2 and a drill tip 3, the cutting portion 2 is provided with two asymmetric spiral grooves 4, the spiral grooves 4 form a cutting edge 5 with an outer wall of the cutting portion 2, and the spiral grooves 4 form an end edge 6 at the drill tip 3; two chip flutes 7 are arranged at the drill tip 3, and chip flute edges 8 are formed by the chip flutes 7 and the drill tip 3.

Referring to fig. 2, in the two-edge drill bit with the asymmetric supporting margin according to the embodiment of the present invention, the spiral groove 4 includes a first spiral groove 41 and a second spiral groove 42, a wall surface of the first spiral groove 41 facing to the rotation direction and an outer wall of the cutting part 2 form a first cutting edge, and a first margin 9 and a first back-to-back-up the first cutting edge; the wall surface of the second spiral groove 42 facing the rotation direction and the outer wall of the blade part 2 form a second cutting edge, and the back of the second cutting edge is provided with a second land 11, a second notch 12 and a third land 13 in sequence. The included angle between the first blade edge 9 and the second blade edge 11 is 190-194 degrees, and the included angle between the first blade edge 9 and the third blade edge 13 is 86-90 degrees. In the high-speed machining process, radial forces borne by the supporting blade zones are not on the same straight line, the 180-degree opposite side of each supporting blade zone is a concave back-carving or hollow cutter body gap, when the drill bit rotates in actual high-speed machining, high-speed friction is avoided, heat is reduced, the blade zones can keep original hardness for a long time, and wear resistance is improved.

Specifically, the wall surface of the first helical flute 41 facing the direction of rotation forms a first end edge 61 with the drill tip 3, and the wall surface of the second helical flute 42 facing the direction of rotation forms a second end edge 62 with the drill tip 3. The chip flutes 7 comprise first chip flutes 71 and second chip flutes 72, said first chip flutes 71 communicating with the first helical flutes 41, said second chip flutes 72 communicating with the second helical flutes 42, said first chip flutes 71 forming with the drill tip 3 a first chip flute edge 81, said second chip flutes 72 forming with the drill tip 3 a second chip flute edge 82. The first chip flute edge 81 is in arc transition connection with the first end edge 61; the second chip containing groove edge 82 is in arc transition connection with the second end edge 62, and the cutting edges are connected smoothly and alternately, so that the abrasion of the drill edge is reduced while the machining efficiency is ensured.

Preferably, the first chip flutes 71 and the second chip flutes 72 divide the drill tip 3 into a first end face 14 and a second end face 15, the first end face 14 and the second end face 15 are connected at the center of the drill tip 3 through the chisel edge 16, and the center of the chisel edge 16 is designed to play a role in centering and ensure the stability during machining.

To sum up, the two-edge drill bit with the asymmetric supporting blade bands provided by the embodiment of the invention has the advantages that through the three supporting blade bands which are asymmetrically arranged, in the high-speed machining process, the radial force borne by the supporting blade bands is not on the same straight line, and the 180-degree opposite side of each supporting blade band is an empty cutter body gap, so that when the drill bit rotates in the actual high-speed machining process, due to stress, the drill bit can slightly recede in the 180-degree direction, the high-speed friction is avoided, the heat generation is reduced, the blade bands can keep the original hardness for a long time, and the wear resistance is kept; the linear speed can be continuously improved on the basis of the conventional linear speed without increasing the abrasion of the blade area, and the service life of the cutter is prolonged while the efficiency is improved.

Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A two-edge drill with an asymmetric supporting blade zone is characterized by comprising a drill body, wherein the drill body comprises a handle part, an edge part and a drill point, the edge part is provided with two asymmetric spiral grooves, the spiral grooves and the outer wall of the edge part form cutting edges, and the spiral grooves form end edges at the drill point; two chip grooves are formed in the drill tip, and chip groove blades are formed by the chip grooves and the drill tip; the spiral groove comprises a first spiral groove and a second spiral groove, a first cutting edge is formed by the wall surface of the first spiral groove facing to the rotation direction and the outer wall of the edge part, and a first edge zone and a first cutting back are sequentially arranged on the back of the first cutting edge; the wall surface of the second spiral groove facing to the rotating direction and the outer wall of the edge part form a second cutting edge, and the back of the second cutting edge is sequentially provided with a second cutting edge zone, a second carving back and a third cutting edge zone.

2. The two-edged drill having asymmetrically supported lands of claim 1 wherein the angle between the first land and the second land is 190 ° to 194 °, and the angle between the first land and the third land is 86 ° to 90 °.

3. The two-edged drill having an asymmetrically supported land as defined in claim 1, wherein the wall surface of said first helical flute facing in the direction of rotation forms a first end edge with the drill tip, and the wall surface of said second helical flute facing in the direction of rotation forms a second end edge with the drill tip.

4. The two-edged drill having an asymmetrically supported land as defined in claim 3 wherein said flutes comprise a first flute communicating with a first flute and a second flute communicating with a second flute, said first flute forming a first chip flute edge with the drill tip and said second flute forming a second chip flute edge with the drill tip.

5. The two-edged drill having an asymmetrically supported land as defined in claim 4 wherein said first chip-receiving flute edge is in circular transition with said first end edge; and the second chip containing groove edge is in arc transition connection with the second end edge.

6. The two-edged drill having an asymmetrically supported land as defined in claim 4 wherein said first and second flutes divide the drill tip into first and second end faces connected by a chisel edge at the center of the drill tip.