CN212094499U

CN212094499U - Chip breaking drill for front cutter face

Info

Publication number: CN212094499U
Application number: CN202020105478.1U
Authority: CN
Inventors: 朱小坤; 何建国
Original assignee: Jiangsu Tiangong Precision Tools Co ltd
Current assignee: Jiangsu Tiangong Precision Tools Co ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-12-08
Anticipated expiration: 2030-01-17

Abstract

The utility model provides a knife face chip breaking bores, includes the cutter body of drillstock and twist form, its characterized in that: the top of cutter body is the drill point, spiral helicine heliciform helicla flute has been seted up to the outer wall of cutter body, the drill point includes two rake face and two back knife faces, the top of rake face is followed the chisel edge direction coping and is formed the face of polishing, two all be equipped with the chip groove on the rake face, the both ends of chip groove are for dividing the bits sword, two all form knife face behind first back knife face and the second through the coping processing on the back knife face, first back knife face with the intersect of knife face is the ascending pitch arc of opening behind the second.

Description

Chip breaking drill for front cutter face

Technical Field

The utility model belongs to the technical field of the instrument, specific saying so relates to a twist drill, especially a rake face chip breaking bores.

Background

The conventional twist drill has been widely used for decades, but under various use conditions, the twist drill gradually exposes defects and problems, such as long main blade, wide cutting chips, great difference of outflow speeds of the cutting chips at different points, large volume of occupied space for curling the cutting chips into wide coils, unsmooth chip removal and difficult inflow of cutting fluid. Therefore, it is very important to solve the problem that the cutting fluid is difficult to flow in due to the unsmooth chip removal during the cutting process of the drill.

Accordingly, the above-mentioned problems are problems that should be considered and solved in designing and using the twist drill structure.

SUMMERY OF THE UTILITY MODEL

To the problem that exists, the utility model provides an overcome the defect among the prior art, provide a rational in infrastructure rake face chip breaking bores.

The technical solution of the utility model is that: the utility model provides a rake face chip breaking bores, includes the cutter body of drillstock and twist form, the top of cutter body is the drill point, spiral helicine helicla flute has been seted up to the outer wall of cutter body, the drill point includes two rake faces and two back knife faces, the top of rake face forms the face of coping, two along the chisel edge direction coping all be equipped with the chip groove on the rake face, the both ends of chip groove are for dividing the bits sword, two knife face behind first knife face and the second is all formed through coping processing on the back knife face, first back knife face with the intersection of knife face is the ascending pitch arc of opening behind the second.

The utility model discloses a further improvement lies in: the thickness of the drilling belly of the cutter body is gradually increased towards the drilling tail.

The utility model discloses a further improvement lies in: the depth of the chip dividing groove is 0.5-1.5 mm.

The utility model discloses a further improvement lies in: the surface of the cutter body is coated with a titanium aluminum nitride coating.

The utility model discloses a further improvement lies in: the included angle between the first rear knife face of two rear knife faces is a first edge, the included angle between the two second rear knife faces is a second edge, and the angle of the first edge is greater than the second edge.

The utility model discloses a further improvement lies in: the angle of the first edge angle is 120-150 degrees, and the angle of the second edge angle is 60-75 degrees.

The utility model discloses a further improvement lies in: the grinding surface comprises two side edges and a bottom edge, the bottom edge is an arc line, and the side edges are respectively located on the side lines of the two first rear cutter surfaces.

The utility model has the advantages that: the drill bit has a simple structure and a reasonable design, and the chip dividing grooves and the chip dividing blades are arranged at the drill bit part, so that the drill bit can carry out chip dividing treatment during working, cutting fluid can conveniently flow in, the drill bit is protected from being worn by chips, and the service life of the drill bit is prolonged; the thickness of the drill belly of the cutter body is gradually increased towards the drill tail, the strength of the drill bit is enhanced, and the drill bit is not easy to break; the titanium aluminum nitride coating is coated on the surface of the cutter body, so that the wear resistance and the oxidation resistance of the cutter body are improved, the friction coefficient is reduced, and the adhesion is prevented; the cutting edge is polished along the direction of the chisel edge, the length of the chisel edge is shortened, the trouble of chip removal and chip breaking is improved, the drilling resistance is reduced, the axial force is reduced compared with the common twist drill, the cutting fluid can conveniently flow into a cutting area, and the temperature of the cutting edge is reduced; the back knife face is polished to form a double-vertex angle, so that the strength of the outer edge turning point of the cutting edge is improved, chip removal and cutting fluid flowing into the spiral groove are facilitated, the trouble of chip removal and chip breaking is improved, the heat load on the unit edge length is reduced, the abrasion of the cutting edge is reduced, the operation is safer, the durability of the drill bit is effectively improved, and the production efficiency is improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a front view of the drill tip of the present invention;

FIG. 3 is a top view of the drill tip of the present invention;

wherein: 1-spiral groove, 2-rake face, 3-grinding face, 4-chip dividing groove, 5-chip dividing edge, 6-first rear face, 7-second rear face and 8-bottom edge.

Detailed Description

In order to deepen the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and embodiments, which are only used for explaining the present invention and are not limited to the protection scope of the present invention.

As shown in the figure, this embodiment provides a rake face chip breaking drill, cutter body including drillstock and twist, cutter body surface coating has titanium aluminum nitride coating, the top of cutter body is the drill point, spiral helicine flute 1 has been seted up to the outer wall of cutter body, its thickness is progressively bodiness to the drill tail department in middle part promptly to the drill abdomen portion of cutter body, the drill point includes two rake face 2 and two back knife faces, the top of rake face forms along the chisel edge direction coping and repaiies face 3, two all be equipped with chip separation groove 4 on the rake face, the both ends of chip separation groove 4 are chip separation sword 5, the degree of depth of chip separation groove is 1mm, two all form first back knife face 6 and second back knife face 7 through coping processing on the back knife face, first back knife face 6 with the intersection line of second back knife face 7 is the ascending pitch arc of opening. Two rear knife face contained angle between the first rear knife face is first frontal angle, and contained angle between two second rear knife faces is second frontal angle, the angle of first frontal angle is greater than second frontal angle, the angle of first frontal angle is 135, the angle of second frontal angle is 60. The dressing surface 3 comprises two side edges and a bottom edge 8, wherein the bottom edge 8 is an arc line, and the side edges are respectively arranged on the side lines of the two first rear cutter surfaces.

The beneficial effect of this embodiment is: the drill bit has a simple structure and a reasonable design, and the chip dividing grooves and the chip dividing blades are arranged at the drill bit part, so that the drill bit can carry out chip dividing treatment during working, cutting fluid can conveniently flow in, the drill bit is protected from being worn by chips, and the service life of the drill bit is prolonged; the titanium aluminum nitride coating is coated on the surface of the cutter body, so that the wear resistance and the oxidation resistance of the cutter body are improved, the friction coefficient is reduced, and the adhesion is prevented; the cutting edge is polished along the direction of the chisel edge, the length of the chisel edge is shortened, the trouble of chip removal and chip breaking is improved, the drilling resistance is reduced, the axial force is reduced compared with the common twist drill, the cutting fluid can conveniently flow into a cutting area, and the temperature of the cutting edge is reduced; the back knife face is polished to form a double-vertex angle, so that the strength of the outer edge turning point of the cutting edge is improved, chip removal and cutting fluid flowing into the spiral groove are facilitated, the trouble of chip removal and chip breaking is improved, the heat load on the unit edge length is reduced, the abrasion of the cutting edge is reduced, the operation is safer, the durability of the drill bit is effectively improved, and the production efficiency is improved.

It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a knife face chip breaking bores, includes the cutter body of drillstock and twist form, its characterized in that: the top of cutter body is the drill point, spiral helicine heliciform helicla flute has been seted up to the outer wall of cutter body, the drill point includes two rake face and two back knife faces, the top of rake face is followed the chisel edge direction coping and is formed the face of polishing, two all be equipped with the chip groove on the rake face, the both ends of chip groove are for dividing the bits sword, two all form knife face behind first back knife face and the second through the coping processing on the back knife face, first back knife face with the intersect of knife face is the ascending pitch arc of opening behind the second.

2. A rake face chip breaker drill as set forth in claim 1, wherein: the thickness of the drilling belly of the cutter body is gradually increased towards the drilling tail.

3. A rake face chip breaker drill as set forth in claim 1, wherein: the depth of the chip dividing groove is 0.5-1.5 mm.

4. A rake face chip breaker drill as set forth in claim 1, wherein: the surface of the cutter body is coated with a titanium aluminum nitride coating.

5. A rake face chip breaker drill as set forth in claim 1, wherein: the included angle between the first rear knife face of two rear knife faces is a first edge, the included angle between the two second rear knife faces is a second edge, and the angle of the first edge is greater than the second edge.

6. The rake face chip breaker drill of claim 5, wherein: the angle of the first edge angle is 120-150 degrees, and the angle of the second edge angle is 60-75 degrees.

7. A rake face chip breaker drill as set forth in claim 1, wherein: the grinding surface comprises two side edges and a bottom edge, the bottom edge is an arc line, and the side edges are respectively located on the side lines of the two first rear cutter surfaces.