CN211516185U

CN211516185U - Hard alloy drill bit

Info

Publication number: CN211516185U
Application number: CN201922302408.5U
Authority: CN
Inventors: 蒋益民; 付军杰; 李军旗
Original assignee: Chengdu Zhundan Technology Co ltd
Current assignee: Chengdu Zhundan Technology Co ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-09-18
Anticipated expiration: 2029-12-17

Abstract

The utility model discloses a carbide drill bit, including stalk portion and cutting portion, the cutting portion includes: two cross blades close to the central axis of the drill, two end blade parts, two auxiliary cutting blades, two rear cutter faces and two spiral chip grooves, the end blade part comprises a main cutting edge which is connected with the corresponding chisel edge and is used for realizing the line contact with the product to be processed so as to realize the cutting of material scraps and a strip-shaped cutting curved surface which is connected with the main cutting edge, the strip-shaped cutting curved surface is used for further contacting with the surface of the product to be processed for cutting, the auxiliary cutting edge is connected with the main cutting edge, the rear cutter face is arranged at the periphery of the end cutter part and is adjacent to the auxiliary cutting edge, the spiral chip groove is arranged between the two rear cutter faces, by arranging the strip-shaped cutting curved surface, the thickness of the material scraps is increased when the hard alloy drill bit is processed, the scraps are easy to break after being curled during drilling, so that the replacement frequency of the drill bit is reduced, and the production cost is reduced.

Description

Hard alloy drill bit

Technical Field

The utility model relates to a drill bit especially relates to a carbide drill bit.

Background

Drilling plays a very important role in the field of manufacturing, and is one of the most important processes in machining, which accounts for about 36% of the machining time. In machining, in particular in the machining of structures with holes in the fields of aerospace, automotive manufacturing and the like, cemented carbide drill bits are used extremely widely. The aluminum alloy material is widely applied to the fields of aerospace, automobile manufacturing and the like due to the characteristics of light weight and easiness in processing, the service life of the conventional drill bit is remarkably shortened in the drilling processing of aluminum alloy materials such as die-cast aluminum, and the main reasons for shortening the service life are poor chip breaking of the drill bit and the breakage of a main cutting edge and a tool nose.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a hard alloy drill bit, which can ensure sufficient sharpness of the cutting edge, and increase the strength of the cutting edge, thereby preventing the cutting edge and the tool tip from collapsing and being cut short, and further realizing high-efficiency processing.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a hard alloy drill bit comprises a shank part and a cutting part connected with the shank part,

the cutting portion includes:

two chisel edges near the axial central axis of the drill,

two end edge parts, each end edge part comprises a main cutting edge, the main cutting edge is connected with a corresponding chisel edge and is used for realizing the cutting of the material scraps by the line contact with the product to be processed, and a strip-shaped cutting curved surface connected with the main cutting knife is used for being in surface contact with the product to be processed so as to increase the thickness of the material scraps during cutting and ensure that the material scraps are more easily bent and broken,

two auxiliary cutting knives connected with the main cutting knife,

two rear cutter faces which are respectively arranged at the periphery of the end cutting part,

two spiral chip grooves, spiral chip groove set up in between two back knife face.

Preferably, the edge of the elongated cutting curved surface corresponding to the spiral chip groove is smoothly connected with the secondary cutting edge.

Preferably, the width of the elongated cutting curved surface perpendicular to the edge direction is less than or equal to 0.15 mm.

Preferably, the length of the elongated cutting curved surface along the edge direction is 1.5-1.7 mm.

Preferably, the axial included angle of the strip-shaped cutting curved surface is formed by the strip-shaped cutting curved surface and the central axis, and the angle range of the axial included angle of the strip-shaped cutting curved surface is 5-12 degrees.

Preferably, the spiral direction of spiral chip groove with the axis forms the axial contained angle of spiral chip groove, the angular scope of the axial contained angle of spiral chip groove is 25 degrees-30 degrees.

Preferably, the intersection of the main cutting edge and the secondary cutting edge is a smooth circular arc line, and the length of the circular arc line is 0.1-0.2 mm.

Preferably, a chip groove for accommodating material chips is arranged in the spiral chip groove.

The utility model has the advantages as follows: the utility model provides a carbide drill bit, through inciting somebody to action the main cutting edge is connected with the chisel edge that corresponds and realizes the cutting of material bits with the line contact who treats the processing product, and set up rectangular shape cutting curved surface on the end cutting portion, this rectangular shape cutting curved surface through with the face contact of treating the processing product cuts to the cutting force that the material bits received when changing the drill chip, make the contact position passivation of drill bit and treating the processing product, make the material bits break more easily, show the life who promotes the drill bit, reduce the tool changing frequency, effectively reduce production manufacturing cost.

Drawings

Fig. 1 is a schematic view of the overall structure of the cemented carbide drill of the present invention.

Fig. 2 is a front view of the cemented carbide drill of the present invention.

Fig. 3 is a schematic structural diagram of the main cutting edge and the elongated cutting curved surface of the present invention.

Fig. 4 is a partially enlarged schematic view of an end blade of the cemented carbide drill of the present invention.

Fig. 5 is a schematic view of the axial included angle between the spiral flute and the elongated cutting curved surface of the cemented carbide drill of the present invention.

Fig. 6 is a schematic structural view of the chip pocket and the intersection of the main cutting blade and the auxiliary cutting blade of the cemented carbide drill of the present invention.

Description of the elements: the cutting tool comprises a shank 10, a cutting part 20, a cross cutter 201, an end cutter part 202, a main cutting cutter 202a, a long-strip-shaped cutting curved surface 202b, an edge 202c, a secondary cutting edge 203, a clearance surface 204, a spiral chip groove 30 and a chip groove 40.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the present invention, and the described embodiments are only some examples of the present invention, but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "axial", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings of the present invention, and are only for convenience of description of the present invention, and do not indicate or imply a specific position that the device or component indicated must have, and therefore should not be construed as limiting the present invention.

It should be noted that, in the present invention, the straight line along the axial center of the cemented carbide drill bit is defined as the central axis, and the axial angle described in the present invention is the included angle between the specific direction and the central axis, and those skilled in the art can understand and analyze the axial angle by combining the specific structure and the illustration.

As shown in fig. 1 and 2, the cemented carbide drill of the present invention includes a shank 10 and a cutting portion 20 connected to the shank 10. The cutting portion 20 includes two chisel edges 201 near the central axis and two end edge portions 202. Each end edge portion 202 includes a primary cutting edge 202 a. The main cutting edge 202a is connected to the chisel edge 201, so that the main cutting edge 202a is in line contact with the product to be machined, and the product to be machined is cut. The end edge portion 202 further includes an elongated cutting curved surface 202b, and the elongated cutting curved surface 202b is connected to the main cutting edge 202 a. The strip-shaped cutting curved surface 202b is cut by surface contact with a product to be processed, so that the thickness of material scraps in the cutting process is increased, the material scraps are more easily bent and broken, and the material scraps can be smoothly discharged.

The cutting portion 20 further includes two minor cutting edges 203, two flank surfaces 204, and two helical flutes 30. The helical flutes 30 are disposed between two relief surfaces 204. The product to be processed is in surface contact with the elongated curved cutting surface 202b, so that the cutting of the material scraps is performed. And the broken chips are discharged through the spiral chip grooves 30, so that the drilling processing of the product to be processed is realized.

As shown in fig. 3, the contact between the major cutting edge 202a and the elongated curved cutting surface 202b and the product to be machined is shown, so as to better understand the line contact and the surface contact between the end edge portion 202 and the product to be machined. The main cutting edge 202a is a sharp edge and is in line contact with a product to be processed during a drilling process to achieve a chip breaking function. In order to further reduce the chipping phenomenon of the main cutting edge 202a caused by the over-sharp drill, the elongated curved cutting surface 202b is disposed inside the drill, so as to realize the surface contact between the end edge portion 202 and the product to be processed. Effectively enhancing the stress bearing capacity of the drill bit in the processing process and preventing the drill bit from collapsing.

As shown in fig. 4, a partial enlarged view of the end blade portion 204 is shown. In this embodiment, the edge 202c of the elongated curved cutting surface 202b corresponding to the helical flute 30 is smoothly connected to the minor cutting edge 203. And a smooth connection mode is adopted, so that the integral smoothness of the drill bit can be ensured, and the abrasion of the drill bit is reduced.

In this embodiment, the width d of the elongated cutting curved surface 202b perpendicular to the edge 202c is less than or equal to 0.15 mm. The length of the elongated cutting curved surface 202b along the edge 202c direction is 1.5-1.7 mm. The specific size of the drill and the length and width of the elongated cutting curved surface 202b can be changed according to the actual processing requirements of the product to be processed so as to achieve the optimal use effect.

As shown in fig. 5, it shows the axial included angle formed by the spiral flute 30 and the central axis, and the axial included angle formed by the elongated cutting curved surface 202b and the central axis. In the present embodiment, the angle β 2 of the axial included angle of the elongated cutting curved surface 202b is in the range of 5 degrees to 12 degrees, and the angle β of the axial included angle of the helical flute 30 is in the range of 25 degrees to 30 degrees. The axial included angle is an included angle between the spiral direction of the spiral chip groove 30 and the central axis.

As shown in fig. 6, the intersection of the main cutting edge 202a and the minor cutting edge 203 is a smooth arc line, and the length of the arc line is 0.1-0.2 mm. By adopting the connection mode of the arc line, the smooth transition connection between the main cutting edge 202a and the auxiliary cutting edge 203 can be further increased, and the drill is ensured not to be easily broken when contacting with the product to be processed.

In the present embodiment, the spiral flutes 30 are provided with the chip flutes 40. The chip containing grooves 40 are arranged to increase the chip containing capacity of the spiral chip discharging grooves 30, so that processed chips can be discharged smoothly, the drill bit is prevented from being blocked when the die-casting aluminum material is processed, and the drilling and cutting of the product to be processed of the die-casting aluminum material can be finished smoothly.

In summary, the elongated curved cutting surface 202b is disposed in the end edge portion 202, so that the end edge portion 202 is in surface contact with the product to be processed during the cutting process of the drill, so as to increase the strength of the end edge portion 202. In addition, the arrangement of the strip-shaped cutting curved surface 202b enables the scraps to be curled and broken more easily, the drill bit is not easy to break, the service life of the drill bit can be prolonged, and the production and manufacturing cost is reduced.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the principles of the present invention may be applied to any other embodiment 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. A kind of hard alloy bit, including shank and cutting portion linking with said shank, characterized by that:

the cutting portion includes:

two chisel edges near the axial central axis of the drill,

two end edge parts, each end edge part comprises a main cutting edge, the main cutting edge is connected with a corresponding chisel edge and is used for realizing the cutting of the material chips by the line contact with the product to be processed, and a strip-shaped cutting curved surface is connected with the main cutting edge and is used for the surface contact with the product to be processed so as to increase the thickness of the material chips during cutting and ensure that the material chips are more easily bent and broken,

two minor cutting edges connected with the major cutting edge,

2. The cemented carbide drill bit of claim 1, wherein: the long strip-shaped cutting curved surface corresponds to the edge at the spiral chip groove and is smoothly connected with the secondary cutting edge.

3. The cemented carbide drill bit of claim 2, wherein: the width of the strip-shaped cutting curved surface perpendicular to the edge direction is less than or equal to 0.15 mm.

4. The cemented carbide drill bit of claim 2, wherein: the length of the strip-shaped cutting curved surface along the edge direction is 1.5-1.7 mm.

5. The cemented carbide drill bit of claim 1, wherein: the strip-shaped cutting curved surface and the central axis form an axial included angle of the strip-shaped cutting curved surface, and the angle range of the axial included angle of the strip-shaped cutting curved surface is 5-12 degrees.

6. The cemented carbide drill bit of claim 1, wherein: the spiral direction of spiral chip groove with the axis forms the axial contained angle of spiral chip groove, the angular scope of the axial contained angle of spiral chip groove is 25 degrees-30 degrees.

7. The cemented carbide drill bit of claim 1, wherein: the intersection of the main cutting edge and the auxiliary cutting edge is a smooth arc line, and the length of the arc line is 0.1-0.2 mm.

8. The cemented carbide drill bit of claim 1, wherein: and a chip groove for accommodating the material chips is arranged in the spiral chip groove.