CN112809047B

CN112809047B - Rolling support type deep hole drill

Info

Publication number: CN112809047B
Application number: CN202011609367.5A
Authority: CN
Inventors: 姚红飞; 金安生; 季能
Original assignee: ZHEJIANG XINXING TOOLS CO Ltd
Current assignee: ZHEJIANG XINXING TOOLS CO Ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2022-07-19
Anticipated expiration: 2040-12-30
Also published as: CN112809047A

Abstract

The invention relates to the technical field of drilling tools, and particularly discloses a rolling support type deep hole drill which at least comprises a cutter body, wherein blades in different forms are arranged at the front end of the cutter body, namely an inner blade, a middle blade and an outer blade, the outer wall of the cutter body is provided with at least two guide supporting parts, and each guide supporting part at least comprises a roller and a roller accommodating cavity for accommodating the roller. Roll formula direction supporting part in this embodiment only has the direction supporting role in prior art on the basis, not only reduces through rolling friction and generates heat, has reduced deep hole machining's the heat dissipation degree of difficulty, has carried out roll extrusion to the hole wall through the supplementary cutting of roll extrusion formula moreover, has promoted the surface quality of pore wall, and prior art has realized strideing across the progress, has especially important meaning to deep hole drilling.

Description

Rolling support type deep hole drill

Technical Field

The invention relates to the technical field of drilling tools, in particular to a rolling support type deep hole drill.

Background

The deep hole drill is a drill bit specially used for processing deep holes, and the problems of difficulty in heat dissipation and chip removal are generally solved in the deep hole processing process.

The BTA deep hole drill in the prior art is provided with an integral cutter body, cutting blades in different shapes, namely an outer blade, a middle blade and an inner blade, are arranged on the cutter body, and two supporting guide blocks in the form of cambered surfaces are arranged on the outer side of the cutter body.

The BTA deep hole of above-mentioned structure bores, and wherein the support guide block is fixed, and at the drilling in-process, the support guide block direct action has the friction with between the pore wall, and this friction must lead to the cutter body to generate heat, has increased radiating degree of difficulty.

Disclosure of Invention

The technical problem to be solved by the invention is to solve the technical defects of large heat productivity of a cutter body and increased heat dissipation difficulty caused by the friction between a fixed support guide block and a hole wall of a BTA deep hole drill in the prior art.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: the rolling support type deep hole drill at least comprises a cutter body, wherein blades in different forms are arranged at the end part of the front end of the cutter body, namely an inner blade, a middle blade and an outer blade, at least two guide supporting parts are arranged on the outer wall of the cutter body, each guide supporting part at least comprises a roller and a roller accommodating cavity for accommodating the roller, the maximum radius of the outer surface of each roller from the axis of the cutter body is R1, the maximum radius of the cutting edge of each outer blade from the axis of the cutter body is R2, R1 is larger than R2, and the difference between R1 and R2 is 0.005-0.01 mm.

In a preferred embodiment, the roller receiving cavity is provided with an opening at the radially outermost side, the width of the opening 53 being smaller than the diameter of the roller.

In a preferred embodiment, the axial distance L between the end of the roller and the edge of the outer blade is 0.4-1.2 mm.

In a preferred embodiment, L is 0.7 to 0.9 mm.

In a preferred embodiment, the roller is made of bearing steel or hard alloy bar stock.

In a preferred embodiment, the number of the guide support parts is 3-8.

In a preferred embodiment, the cutter body is provided with internal chip removal channels distributed on both sides of the blade.

In a preferred embodiment, the rolling support type gun drill is a BTA gun drill.

Compared with the prior art, the rolling support type deep hole drill has the following beneficial effects:

(1) during drilling, the roller and the rolling type guide supporting part formed by the roller accommodating cavity are used as a stress support of the outer blade, and the function of the stress support is consistent with the guide supporting function of the fixed type guide supporting part in the prior art.

(2) Rolling friction is formed between the roller and the hole wall, and as is known, the friction force of the rolling friction is smaller, the heating influence of the rolling friction between the roller and the hole wall on the cutter body is smaller, and the heat dissipation difficulty in the drilling process of the deep hole drill is obviously reduced.

(3) Because the maximum radius R1 of the outer surface of the roller from the axis of the cutter body is larger than the maximum radius R2 of the cutting edge of the outer blade from the axis of the cutter body, the roller performs a rolling action on the hole wall processed by the outer blade to form auxiliary cutting, and the rolling type auxiliary cutting reduces the surface roughness of the hole wall and smoothes the surface of the hole wall.

In summary, the rolling type guiding support portion in the embodiment has the guiding support function in the prior art, not only reduces heat generation through rolling friction and reduces the heat dissipation difficulty of deep hole machining, but also improves the surface quality of the hole wall by performing rolling type auxiliary cutting machining on the hole wall through rolling, and compared with the prior art, the rolling type guiding support portion realizes the leap type progress and has a particularly important significance for deep hole drilling machining.

Drawings

Fig. 1 is a schematic perspective view of a rolling support type deep hole drill according to the present embodiment;

FIG. 2 is a schematic structural diagram of the rolling support type gun drill in an exploded state according to the present embodiment;

fig. 3 is a schematic front view of the rolling support type deep hole drill according to the present embodiment;

fig. 4 is a schematic top view of the rolling support type gun drill of the present embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, integrally connected, or detachably connected; may be communication within two elements; they may be directly connected or indirectly connected through an intermediate, and those skilled in the art will understand the specific meaning of the above terms in the present invention in specific situations.

The rolling support type gun drill of the present embodiment will be described in detail below, taking BTA gun drill as an example.

As shown in fig. 1 to 4, the BTA deep hole drill of the present embodiment includes an integral cutter body 1, and the front end of the cutter body 1 is provided with different types of blades, namely an inner blade 2, a middle blade 3, and an outer blade 4, wherein the inner blade 2 is located in the middle, the middle blade 3 and the outer blade 4 are located on both sides of the inner blade, and the three blades are arranged side by side approximately. Inner chip removal channels 6 are respectively arranged on two sides of the blade group with the three blades arranged.

It should be noted that the above-described structures are all the prior art, and are the same as the BTA deep hole drill structure in the prior art.

As the greatest improvement of the present embodiment, which is different from the prior art, as shown in fig. 1 and fig. 2, 4 guide supports 5 are provided on the outer wall of the cutter body 1, and the guide supports 5 include rollers 51 and roller receiving cavities 52 provided on the outer wall of the cutter body for receiving the rollers 51.

It should be noted that, in the present embodiment, 4 guiding support portions 5 are provided, wherein the guiding support portions 5 may be in other numbers, for example, 2 to 8, preferably 3 to 8.

In a preferred embodiment, the roller receiving cavity 52 is provided with an opening 53 at the radially outermost side, the width of the opening 53 being smaller than the diameter of the roller 51. During assembly, the roller 51 is inserted from the upper end of the roller receiving chamber 52, and after the insertion, the upper end of the roller receiving chamber 52 is subjected to known necking or welding so that the roller 51 cannot be removed from the upper end but can rotate in the roller receiving chamber 52.

In the deep hole machining process, the part of the roller 51 exposed from the opening is in direct contact with the hole wall, so that the guide supporting effect on the outer blade is formed. During the interaction of the rollers 51 with the bore wall, the rollers 51 will rotate about their own axis, creating rolling friction with the front of the bore wall. Compared with the prior art, the friction force of rolling friction is very small, the influence of the rolling friction with small friction force on the heating of the cutter body is small, and therefore the difficulty of heat dissipation in the deep hole machining process is reduced.

As shown in FIG. 4, the maximum radius of the outer surface of the roller 51 from the cutter body axis is R1, the maximum radius of the cutting edge of the outer blade 4 from the cutter body axis is R2, wherein R1 is greater than R2, and the difference between R1 and R2 is 0.005-0.01 mm. Based on the size setting, the roller 51 has a rolling effect on the hole wall processed by the outer blade 4, and the surface roughness of the hole wall is reduced and the surface of the hole wall is smoother through the rolling type auxiliary cutting. The surface quality of the hole wall is greatly improved, and compared with the prior art, the cross-over type progress is realized, and the method has a particularly important significance on deep hole drilling.

Since the rollers 51 not only serve as a guide support but also serve as a rolling process, a high-hardness wear-resistant material such as bearing steel or cemented carbide is used.

As shown in FIG. 3, in the present embodiment, the axial distance L between the end of the roller 51 and the outer blade edge is 0.4 to 1.2mm, preferably 0.7 to 0.9 mm.

In summary, the above description is only a preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rolling support type deep hole drill at least comprises a cutter body, wherein the front end of the cutter body is provided with blades in different forms, namely an inner blade, a middle blade and an outer blade, and the rolling support type deep hole drill is characterized in that the outer wall of the cutter body is provided with at least two guide support parts, each guide support part at least comprises a roller and a roller accommodating cavity for accommodating the roller, the maximum radius of the outer surface of the roller from the axis of the cutter body is R1, the maximum radius of the cutting edge of the outer blade from the axis of the cutter body is R2, R1 is larger than R2, and the difference between R1 and R2 is 0.005-0.01 mm; the axial distance L between the end part of the roller and the cutting edge of the outer blade is 0.4-1.2 mm.

2. A rolling support gun drill according to claim 1, characterized in that the roller-receiving cavity is provided with an opening at the radially outermost side, the width of the opening being smaller than the diameter of the roller; the roller is inserted from the upper end of the roller accommodating cavity, and the upper end of the roller accommodating cavity is subjected to necking processing or welding processing after the roller is inserted.

3. The rolling support type gun drill according to claim 1, wherein L is 0.7 to 0.9 mm.

4. A rolling support gun drill according to claim 1, characterized in that the material of the rollers is bearing steel or cemented carbide.

5. The rolling support type gun drill according to claim 1, wherein the number of the guide support portions is 3 to 8.

6. The rolling support gun drill according to claim 1 wherein the cutter body is provided with internal chip removal channels distributed on both sides of the cutter blades.

7. A rolling support gun according to any one of claims 1-6, characterized in that the rolling support gun is a BTA gun.