CN203956165U

CN203956165U - A kind of drill bit

Info

Publication number: CN203956165U
Application number: CN201420393099.1U
Authority: CN
Inventors: 黄如; 鄢勤; 陈三东
Original assignee: AVIC HUNAN GENERAL AVIATION ENGINE Co Ltd
Current assignee: Hunan Nanfang General Aviation Engine Co., Ltd.
Priority date: 2014-07-16
Filing date: 2014-07-16
Publication date: 2014-11-26
Anticipated expiration: 2024-07-16

Abstract

The utility model provides a kind of drill bit, it comprises drillstock, operate portions, apex point, and the helical angle of described working portion is 14-16 degree, and the chisel edge length of described apex point is 0.08-0.11mm, described cutting edge center is crossed in the position of described chisel edge on described cutting edge, and described cutting edge is arc transition.A kind of drill bit provided by the utility model, it makes the wearing and tearing of drill bit cutter be mainly main cutting edge wearing and tearing, avoids chisel edge place to produce tipping, thereby can carry out the reconditioning use of repetition for the drill bit after wearing and tearing, greatly reduces the cost of charp tool.

Description

A kind of drill bit

Technical field

The utility model relates to cutter field, particularly a kind of drill bit.

Background technology

Drill bit is the common tool of boring, also has the technical standard of various drill bits now, still, in some specific boring situations, uses existing drill bit not to be well positioned to meet processing request.For example,

Fig. 1 is a kind of structural representation of axial workpiece, shown in Figure 1, on this axial workpiece, there is the hole 1 of 12 Φ 12.7+0.05/0, in process, need first roughing to Φ 12 ± 0.2, this shaft parts material is NI718 (nickel-base alloy), the working depth L1 in described hole 1 is 57.658mm, in process, the length L 2 that drill bit need to be dodged is 139.827mm, because this shaft parts material hardness, intensity are higher, cutting ability is very poor, therefore, drill bit is very easy to wear, and the life-span is low.Add man-hour carrying out above-mentioned hole, due to chip removal and the processing environment such as cooling poor, drill bit stretches out length, therefore, situation is more unfavorable.

In the time that preliminary working is carried out in the hole 1 in Fig. 1, can adopt horizontal four-axis process equipment, select existing common alloy bit to process, Fig. 2 a is a kind of existing Φ 12 alloy bit structural representations; Fig. 2 b is the structural representation of the cutting edge of Fig. 2 a; Fig. 2 c is A place structure enlarged diagram in Fig. 2 b.Shown in Fig. 2 a-2c, this drill bit comprises drillstock 2, operate portions 3, apex point 4, the extension elongation of described drill bit, the length L 3 that is described drillstock 2 is more than or equal to 240mm with length L 4 sums of described operate portions 3, can ensure like this to add and dodge length man-hour and reach 139.827mm, machined parameters is, adding man-hour rotating speed is 240 revs/min, feeding is 18mm/ minute, and linear velocity is about 9mm/ minute.In process, often there is tipping phenomenon in chisel edge 41 places of drill bit, as do not found in time and process, very easily causes large hole drill or cause the problem of broken drill to occur.Therefore, this drill bit can not ensure the quality of part, and after tipping, cutter is refaced, and to re-use rate low, and the cost of charp tool is high again, can not meet the needs of production.

Utility model content

The technical problems to be solved in the utility model is to provide a kind of drill bit, to reduce or to avoid problem noted earlier.

For solving the problems of the technologies described above, the utility model proposes a kind of drill bit, it comprises drillstock, operate portions, apex point, the helical angle of described operate portions is 14-16 degree, the chisel edge length of described apex point is 0.08-0.11mm, described cutting edge center is crossed in the position of described chisel edge on described cutting edge, and described cutting edge is arc transition.

Preferably, described operate portions length is more than or equal to 65mm, and described drillstock length is more than or equal to 175mm.

Preferably, described helical angle is 15 degree, and described chisel edge length is 0.1mm.

A kind of drill bit provided by the utility model, it makes the wearing and tearing of drill bit cutter be mainly main cutting edge wearing and tearing, avoids chisel edge place to produce tipping, thereby can carry out the reconditioning use of repetition for the drill bit after wearing and tearing, greatly reduces the cost of charp tool.

Brief description of the drawings

The following drawings is only intended to the utility model to schematically illustrate and explain, does not limit scope of the present utility model.Wherein,

Fig. 1 is a kind of structural representation of axial workpiece;

Fig. 2 a is a kind of existing Φ 12 alloy bit structural representations;

Fig. 2 b is the structural representation of the cutting edge of Fig. 2 a;

Fig. 2 c is A place structure enlarged diagram in Fig. 2 b;

Fig. 3 a is according to the structural representation of a kind of drill bit of a specific embodiment of the present utility model;

Fig. 3 b is the structural representation of the cutting edge of Fig. 3 a;

Fig. 3 c is B place structure enlarged diagram in Fig. 3 b.

Detailed description of the invention

Understand for technical characterictic of the present utility model, object and effect being had more clearly, now contrast brief description of the drawings detailed description of the invention of the present utility model.Wherein, identical parts adopt identical label.

Fig. 3 a is according to the structural representation of a kind of drill bit of a specific embodiment of the present utility model; Fig. 3 b is the structural representation of the cutting edge of Fig. 3 a; Fig. 3 c is that in Fig. 3 b, B place structure enlarged diagram is referring to shown in Fig. 3 a-3c, and the utility model provides a kind of drill bit, to reduce or to avoid problem noted earlier.

For solving the problems of the technologies described above, the utility model proposes a kind of drill bit, it comprises drillstock 2 ', operate portions 3 ', apex point 4 ', the pitch angle alpha will of described operate portions 3 ' is 14-16 degree, chisel edge 41 ' the length d of described apex point 4 ' is 0.08-0.11mm, described cutting edge 42 ' center 43 ' is crossed in the position of described chisel edge 41 ' on described cutting edge 42 ', and described cutting edge 42 ' is arc transition.

Described in background technology, in order to solve the hole 1 in Fig. 1 that background technology mentions while carrying out preliminary working, often there is tipping phenomenon in chisel edge 41 places of common alloy bit shown in Fig. 2 a-2c, as do not found in time and process, very easily causes large hole drill or cause the problem of broken drill.

The utility model has reduced the described pitch angle alpha will of drill bit to 14-16 degree, has improved the integral rigidity of described drill bit, and vibration in cutting is reduced; Meanwhile, the intensity that reduces also to have strengthened described cutting edge 42 ' part of described pitch angle alpha will; In addition, in the time of chisel edge described in reconditioning 41 ', make the position of described chisel edge 41 ' on described cutting edge 42 ' cross described cutting edge 42 ' center 43 ', so just increased described drill bit and held bits and area of dissipation; Described cutting edge 42 ' is grinding into arc transition by original wedge angle transition, is also just conducive to reduce stress and concentrates.By existing common alloy bit is carried out to above-mentioned transformation, make the wearing and tearing of drill bit cutter in using be mainly main cutting edge 42 ' wearing and tearing, avoid chisel edge 41 ' to locate to produce tipping, thereby can carry out the reconditioning use of repetition for the drill bit after wearing and tearing, greatly reduce the drill bit cost of charp tool.

In a preferred embodiment, described operate portions length L 3 ' is more than or equal to 65mm, and described drillstock length L 4 ' is more than or equal to 175mm.

In a preferred embodiment, described pitch angle alpha will is 15 degree, and described chisel edge 41 ' length d is 0.1mm.Described chisel edge 41 ' length d is 0.1mm, and axial cutting force can reduce like this cutting time makes cutting more smooth and easy.

Although it will be appreciated by those skilled in the art that the utility model is to be described according to the mode of multiple embodiment, be not that each embodiment only comprises an independently technical scheme.For the purpose of in description, so narration is only used to know; those skilled in the art should make description as a wholely to be understood, and regard technical scheme related in each embodiment as the mode that can mutually be combined into different embodiment understand protection domain of the present utility model.

The foregoing is only the schematic detailed description of the invention of the utility model, not in order to limit scope of the present utility model.Any those skilled in the art, is not departing from equivalent variations, amendment and the combination under the prerequisite of design of the present utility model and principle, done, all should belong to the scope of the utility model protection.

Claims

1. a drill bit, it comprises drillstock, operate portions, apex point, it is characterized in that, the helical angle of described operate portions is 14-16 degree, the chisel edge length of described apex point is 0.08-0.11mm, and described cutting edge center is crossed in the position of described chisel edge on cutting edge, and described cutting edge is arc transition.

2. drill bit according to claim 1, is characterized in that, drill neck length is more than or equal to 65mm, and described drillstock length is more than or equal to 135mm.

3. drill bit according to claim 1, is characterized in that, described helical angle is 15 degree, and described chisel edge length is 0.1mm.