CN217647567U

CN217647567U - High-performance quick drill

Info

Publication number: CN217647567U
Application number: CN202221525082.8U
Authority: CN
Inventors: 吴宏; 何建国
Original assignee: Rugao Qianjun Tools Co ltd
Current assignee: Rugao Qianjun Tools Co ltd
Priority date: 2022-06-18
Filing date: 2022-06-18
Publication date: 2022-10-25
Anticipated expiration: 2032-06-18

Abstract

The utility model relates to a high performance bores soon, including drillstock and work portion, its characterized in that: the whole working part is of a cylinder structure, two spiral grooves extending to the top end face of the cylinder along the axial direction are symmetrically arranged in the center of the cylinder, the top end face of the cylinder structure is processed to form a pair of rear cutter faces inclined relative to the axis of the cylinder, the joint between the two rear cutter faces is a cross edge, the topmost part of the same spiral groove takes the cross edge as a boundary, one side of the top end face is used as a front cutter face, the other side of the top end face is used as a groove back face, and a main cutting edge is formed between the front cutter face and the rear cutter face; the main cutting edge comprises a main cutting section close to the lateral edge side and a grinding outer edge section far away from the lateral edge side, and an included angle smaller than 180 degrees is formed by the projection of the grinding outer edge section and the main cutting section on the cross section of the cylinder. The utility model has the advantages that: easy cutting, labor saving and long service life.

Description

High-performance quick drill

Technical Field

The utility model relates to a fluted drill, in particular to high performance is bored soon.

Background

Twist drills are tools for drilling round holes in workpieces by rotary cutting relative to a fixed axis, and are known as twist drills because the chip flutes are helical. The twist drill mainly comprises a drill rod with a cylindrical spiral groove cutting edge structure, a drill bit arranged at the front end of the drill rod and a connecting handle connected with the drill rod.

In order to improve the performance of the traditional twist drill, people adopt a plurality of methods, or chip dividing grooves are formed or the outer edge chisel edge is polished, so that the performance of the twist drill is greatly improved. However, the numerical value of the rake angle of each point on the main edge is changed greatly, a negative rake angle still exists near the drill core, and the cutting condition is poor and is not changed fundamentally.

Therefore, in view of the above phenomena, CN201147858Y discloses a high performance powerful twist drill, which comprises a shank and a working portion, wherein the working portion comprises a cutting portion and a guide portion, the cutting portion comprises a rake face, a flank face, a main cutting edge and a chisel edge, and the guide portion comprises a rear flute edge and a chip groove; the main cutting edge is inclined from outside to inside, the included angle between the main cutting edge and a central vertical line is 3-25 degrees in the cross section, the main cutting edge and the back of a groove are connected at a narrow chisel edge, the length of the narrow chisel edge is 0.03-0.5mm, and the rake angle degree at the drill core is a positive value.

In the process of drilling, the twist drill achieves the purposes of reducing drilling resistance, improving production efficiency and the like, but in actual use, the molded line is found to have larger resistance to a main cutting edge during cutting when the molded line is used for cutting some harder materials, so that the damage to a drill bit during cutting is larger, the corresponding service life is shorter, and the chip breaking effect is still in a space for improving.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a drilling chip breaking is effectual, fast high performance is bored soon.

In order to solve the technical problem, the utility model adopts the technical scheme that: the utility model provides a high performance bores soon, includes drill shank and working portion, and its innovation point lies in: the whole working part is of a cylinder structure, two spiral grooves extending to the top end face of the cylinder along the axial direction are symmetrically arranged in the center of the cylinder, the top end face of the cylinder structure is processed to form a pair of rear cutter faces inclined relative to the axis of the cylinder, the joint between the two rear cutter faces is a cross edge, the topmost part of the same spiral groove takes the cross edge as a boundary, one side of the top end face is used as a front cutter face, the other side of the top end face is used as a groove back face, and a main cutting edge is formed between the front cutter face and the rear cutter face; the front tool face and the back face of the same spiral groove are V-shaped on the section vertical to the spiral line of the spiral groove; the main cutting edge comprises a main cutting section close to the side of the cross edge and a grinding outer edge section far away from the side of the cross edge, and an included angle smaller than 180 degrees is formed by the projection of the grinding outer edge section and the main cutting section on the cross section of the cylinder. The length ratio of the main cutting section to the grinding outer edge section is 3~5:1, the included angle of the projection of the grinding outer edge section and the main cutting section on the cross section of the cylinder is 162 degrees.

The design of the grinding outer edge section is utilized, the cutting load distribution of the main cutting edge is effectively improved, the rigidity of the main cutting edge is increased, and the turning between the main cutting edge section and the grinding outer edge section can also play a certain chip dividing role, so that the chip dividing effect is improved.

The main cutting section is of a continuous step-shaped structure and is sequentially provided with a first cutting section, a second cutting section and a third cutting section from one side close to the chisel edge, the first cutting section, the second cutting section and the third cutting section are parallel to each other, and the first cutting section, the second cutting section and the third cutting section are respectively connected through an inclined transition section; a line coincident with the second cutting section is defined as a datum line, and the first cutting section and the third cutting section are respectively positioned on two sides of the datum line. And controlling the distance between the first cutting segment and the datum line and the distance between the third cutting segment and the datum line to be 0.010 to 0.016 of the diameter of the drill hole. The stress of the cutting edge of the main cutting edge is dispersed when the main cutting edge cuts, the chip dividing effect is further achieved, the original negative rake angle close to the central axis is ground into a positive rake angle through correction, the cutting is easier and more labor-saving, the drilling speed is improved by about 13% compared with that of a twist drill with the same specification standard, and the service life is prolonged.

Drawings

Fig. 1 is a top view of a high-performance fast drill according to an embodiment of the present invention.

Fig. 2 is a front view of the embodiment of the present invention.

Fig. 3 is a top view of the second embodiment of the present invention.

Detailed Description

The utility model discloses a quick fluted drill of high performance includes drillstock and working portion, and its working portion is whole to be a cylinder structure, and central symmetry is provided with the helicla flute that twice extended to cylinder top face along the axial on the cylinder.

Example 1

As shown in fig. 1 and 2, a pair of flank surfaces 1 inclined relative to the cylinder axis are machined on the top end surface of the cylinder structure, the joint between the two flank surfaces 1 is a chisel edge 2, the topmost part of the same spiral groove takes the chisel edge 2 as a boundary line, one side is a rake surface 3, the other side is a flute back surface 4, and a main cutting edge 5 is formed between the rake surface 3 and the flank surfaces 1; the rake face 3 and the groove back face 4 of the same spiral groove are V-shaped on the section perpendicular to the spiral line of the spiral groove.

The main cutting edge 5 comprises a main cutting section 51 close to the lateral edge side and a thinning outer edge section 52 far away from the lateral edge side, and the thinning outer edge section and the main cutting section form an included angle smaller than 180 degrees. In this embodiment, an included angle between the grinding outer edge section and the main cutting section is 162 °, and a length ratio of the main cutting section to the grinding outer edge section is 3:1.

example 2

The present embodiment is basically the same as embodiment 1, and includes a flank face 1, a chisel edge 2, a rake face 3, a groove back face 4, and a major cutting edge 5.

The main cutting edge 5 comprises a main cutting section close to the lateral edge side and a grinding outer edge section 52 far away from the lateral edge side, and an included angle smaller than 180 degrees is formed between the grinding outer edge section and the main cutting section.

The difference lies in that: as shown in fig. 3, the main cutting segment is a continuous step-like structure, and includes a first cutting segment 511, a second cutting segment 512, and a third cutting segment 513 in sequence from a side close to the chisel edge, wherein the first, second, and third cutting segments are parallel to each other, and the first, second, and third cutting segments are connected by an inclined transition segment. In this embodiment, the length ratio of the main cutting segment to the thinning outer edge segment is 5:1, the included angle between the first cutting section, the second cutting section and the third cutting section and the grinding outer edge section is 160 degrees, the length of the first cutting section is the same as that of the second cutting section, and the length of the third cutting section is slightly shorter than that of the first cutting section and that of the second cutting section.

A line coincident with the second cutting section is defined as a datum line, and the first cutting section and the third cutting section are respectively positioned on two sides of the datum line. And controlling the distance between the first cutting section and the reference line and the distance between the third cutting section and the reference line to be 0.010 to 0.016 of the diameter of the drill hole. In addition, the original main cutting edge negative rake angle close to the central axis is repaired into a positive rake angle, so that the cutting is easier and more labor-saving.

The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a high performance bores soon, includes drill shank and working portion, its characterized in that:

the whole working part is of a cylinder structure, two spiral grooves extending to the top end face of the cylinder along the axial direction are symmetrically arranged in the center of the cylinder, the top end face of the cylinder structure is processed to form a pair of rear cutter faces inclined relative to the axis of the cylinder, the joint between the two rear cutter faces is a cross edge, the topmost part of the same spiral groove takes the cross edge as a boundary, one side of the top end face is used as a front cutter face, the other side of the top end face is used as a groove back face, and a main cutting edge is formed between the front cutter face and the rear cutter face; the front cutter face and the back of the same spiral groove are V-shaped on the section vertical to the spiral line of the spiral groove;

the main cutting edge comprises a main cutting section close to the lateral edge side and a grinding outer edge section far away from the lateral edge side, and an included angle smaller than 180 degrees is formed by the projection of the grinding outer edge section and the main cutting section on the cross section of the cylinder.

2. The high performance fast drill of claim 1, wherein: the length ratio of the main cutting section to the grinding outer edge section is 3~5:1.

3. the high performance fast drill of claim 1, wherein: the included angle formed by the projection of the grinding outer edge section and the main cutting section on the cross section of the cylinder is 162 degrees.

4. A high performance fast drill according to claim 1, 2 or 3, characterized in that: the main cutting section is of a continuous step-shaped structure and is sequentially provided with a first cutting section, a second cutting section and a third cutting section from one side close to the chisel edge, the first cutting section, the second cutting section and the third cutting section are parallel to each other, and the first cutting section, the second cutting section and the third cutting section are respectively connected through an inclined transition section;

a line coincident with the second cutting section is defined as a datum line, and the first cutting section and the third cutting section are respectively positioned on two sides of the datum line.

5. The high performance fast drill of claim 4, wherein: the distance between the first cutting segment and the third cutting segment and the datum line is 0.010 to 0.016 of the diameter of the drill hole.