CN117140641A - Carbon fiber drilling tool and feeding speed thereof - Google Patents

Abstract

The application discloses a carbon fiber drilling tool and a feeding speed thereof, wherein the tool comprises a handle and a tool body, the tool body is provided with a tool end part, the tool end part is provided with a first cutting edge, a second cutting edge and a chip pocket, the end part of the first cutting edge forms a first tool nose, the end part of the second cutting edge forms a second tool nose, and a third tool nose is arranged between the first tool nose and the second tool nose. The cutter adopts a three-point design, can accept from three points when drilling the carbon fiber material, and avoids layering and splitting of the material caused by over concentrated stress of single points; the three tool tips of the tool are designed at proper angles, so that the problem that the tool tips are too sharp to cause layering and splitting of materials easily is avoided, and the service life of the tool is influenced; the application reduces the feeding speed F by 5-10% when drilling the carbon fiber material, and can further reduce the layering and splitting of the material during drilling.

Description

Carbon fiber drilling tool and feeding speed thereof

Technical field:

the application belongs to the technical field of carbon fiber drilling tools, and particularly relates to a carbon fiber drilling tool and a feeding speed thereof.

The background technology is as follows:

the light weight of the material is one of important measures for realizing energy conservation and emission reduction, and has important significance for sustainable development of the national industry. Carbon fiber has the advantages of light specific gravity, high specific strength, good fatigue resistance and the like, and is widely applied to the fields of aerospace, rail transit, automobiles, medical treatment and the like. The application of carbon fibers in the field of lightweight automobiles has been significantly advanced. The carbon fiber material has the characteristics of high strength, high rigidity and low density, so that the carbon fiber material is suitable for various fields, can reduce weight, is used as a product part, and is required to be provided with a mounting hole, and layering and splitting often occur when a common drill bit is used for drilling the carbon fiber composite material. First, the carbon fibers have a layered structure, i.e., fiber bundles are aligned in the fiber axis direction and bonded together by a resin. When the drill contacts the fiber surface and applies cutting forces, if the drill does not properly select a reasonably suitable drilling tool, drilling parameters, and tool wear is severe, it is easy to cause the fiber bundles to be broken down and separated, thereby causing delamination. Second, carbon fiber is a brittle material, and is easily split. During drilling, the carbon fiber surface may develop high temperatures, which may lead to thermal damage and thermal decomposition of the fiber. Meanwhile, the cutting force in the drilling process can apply stress to the fiber, so that crack expansion is easy to initiate, and finally, splitting phenomenon is caused. Based on the characteristics, the application provides the special drilling tool for the carbon fiber, which can avoid layering and splitting of the carbon fiber.

The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.

The application comprises the following steps:

the object of the present application is to provide a carbon fiber drilling tool and a feed rate thereof, which overcomes the above-mentioned drawbacks of the prior art.

In order to achieve the above purpose, the application provides a carbon fiber drilling tool, which comprises a handle and a tool body, wherein the tool body is provided with a tool end part, the tool end part is provided with a first cutting edge, a second cutting edge and a chip pocket, the end part of the first cutting edge forms a first tool nose, the end part of the second cutting edge forms a second tool nose, and a third tool nose is arranged between the first tool nose and the second tool nose.

Further, the method comprises the steps of,preferably, the apex angle of the third nose is denoted as alpha ₁ ，α ₁ Is in the range of 125 deg. to 135 deg..

Further, preferably, the apex angle of the first and second tips is denoted as α ₂ ，α ₂ Ranging from 67 deg. to 72 deg..

Further, preferably, the angle between the first and third cutting edges and the angle between the second and third cutting edges are denoted as α ₃ ，α ₃ Also in the range 125 deg. to 135 deg..

Further, preferably, the angle between the first or second blade edge and the center line of the third blade edge is denoted as alpha ₄ ，α ₄ Ranging from 12 ° to 15 °.

Further, preferably, the helix angle of the chip flute is denoted as alpha ₅ ，α ₅ Also in the range 22 deg. to 27 deg..

Further, preferably, the chip flute extends to the tool body.

Further, preferably, the first, second and third blade edges have the same height.

The application also provides a feed rate of a carbon fiber drilling tool according to the following formula:

S＝1000Vc/π×D

F＝S×n×Z

wherein Vc refers to cutting speed, unit m/min, pi=3.14, D refers to cutter diameter, F refers to feed speed, S refers to spindle rotation speed, n refers to cutter blade number, Z=0.01-0.3;

the feeding speed of the cutter is 90-95% F.

Further, preferably, the feeding is performed in a spray environment.

Compared with the prior art, one aspect of the application has the following beneficial effects:

(1) The cutter adopts a three-point design, can accept from three points when drilling the carbon fiber material, and avoids layering and splitting of the material caused by over concentrated stress of single points;

(2) The three knife tips of the knife are designed at proper angles, so that the situation that the knife tips are too sharp to cause layering and splitting of materials easily is avoided, and the service life of the knife is influenced;

(3) The application reduces the feeding speed F by 5-10% when drilling the carbon fiber material, and can further reduce the layering and splitting of the material during drilling.

Description of the drawings:

FIG. 1 is a schematic view of a carbon fiber drilling tool according to the present application;

FIG. 2 is a front view of a carbon fiber drilling tool of the present application;

FIG. 3 is an enlarged schematic view of a portion of a carbon fiber drilling tool according to the present application;

FIG. 4 is a top view of a carbon fiber drilling tool of the present application;

reference numerals: 1-shank, 2-tool body, 21-tool end, 211-first edge, 212-second edge, 213-flute, 214-first nose, 215-second nose, 216-third nose, 217-secondary relief surface, 218-secondary cutting edge, 219-primary relief surface, 2110-primary cutting edge, 2111-rake surface.

The specific embodiment is as follows:

the following detailed description of specific embodiments of the application is, but it should be understood that the application is not limited to specific embodiments.

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

Example 1:

as shown in fig. 1-4, a carbon fiber drilling tool comprises a handle 1 and a tool body 2, wherein the tool body 2 is provided with a tool end 21, the tool end 21 is provided with a first cutting edge 211, a second cutting edge 212 and a chip flute 213, the end of the first cutting edge 211 forms a first tool tip 214, the end of the second cutting edge 212 forms a second tool tip 215, and a third tool tip 216 is arranged between the first tool tip 214 and the second tool tip 215.

In the present embodiment, the first nose 214 and the second nose 215 are also referred to as secondary corners, the third nose 216 is also referred to as a top corner, the arc surface from the secondary corner to the top corner is referred to as a secondary relief surface 217, and the arc is referred to as a secondary cutting edge 218; the face between the third nose 216 and the minor apex angle is referred to as the major relief face 219, the edge is referred to as the major cutting edge 2110, and the face between the major cutting edge 2110 and the tool body 2 is referred to as the rake face 2111.

In the embodiment, three knife tip designs are adopted, force is applied from three points when the carbon fiber is drilled, and material layering and splitting caused by too concentrated single-point stress can be avoided.

In the present embodiment, the apex angle of the third nose 216 is denoted as α ₁ ，α ₁ Is in the range of 125 deg. to 135 deg.. The third tool nose 216 plays a role in centering when being used as a middle position for drilling, adopts a larger vertex angle design, can avoid layering and splitting of materials while meeting the drilling capability, and ensures the service life of the tool nose.

In this embodiment, the apex angle of the first and second tips 214 and 215 is denoted as α ₂ ，α ₂ Ranging from 67 deg. to 72 deg.. The first knife tip 214 and the second knife tip 215 are used as knife tips on two sides, and are designed with larger vertex angles, so that the drilling capability is met, the layering and splitting of materials can be avoided, and the service life of the knife tips is ensured.

In this embodiment, the angle between the first tip 214 and the third tip 216 and the angle between the second tip 215 and the third tip 216 are denoted as α ₃ ，α ₃ Also in the range 125 deg. to 135 deg.. The angle design is beneficial to reducing drilling resistance, is beneficial to drilling, ensures machining precision and can also ensure the service life of the cutter.

In this embodiment, the angle between the center line of the first tip 214 or the second tip 215 and the center line of the third tip 216 is denoted as α ₄ ，α ₄ Ranging from 12 DEG to 15°。

In this embodiment, the helix angle of the flute 213 is denoted as α ₅ ，α ₅ Also in the range 22 deg. to 27 deg.. The angle is convenient for discharging the material scraps and can ensure the rigidity of the cutter.

In this embodiment, the chip flute 213 extends to the tool body 2. Extending to the tool body 2 further facilitates the discharge of material chips.

In this embodiment, the heights of the first tip 214, the second tip 215, and the third tip 216 are consistent, when the force is applied from three points simultaneously during drilling, the center and the circumference are uniformly stressed, so that the risk of delamination and splitting of the material can be reduced, and the generation of burrs is further reduced.

Example 2:

the application also provides a feed rate of a carbon fiber drilling tool according to the following formula:

S＝1000Vc/π×D

F＝S×n×Z

wherein Vc refers to cutting speed, unit m/min, pi=3.14, D refers to cutter diameter, F refers to feed speed, S refers to spindle rotation speed, n refers to cutter edge number, Z is an empirical value, and is 0.01-0.3;

the feeding speed of the cutter is 90-95% F. The carbon fiber material may be processed by adjusting the thickness of the material within a range.

The foregoing descriptions of specific exemplary embodiments of the present application are presented for purposes of illustration and description. It is not intended to limit the application to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the application and its practical application to thereby enable one skilled in the art to make and utilize the application in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the application be defined by the claims and their equivalents.

Claims (10)

1. A carbon fiber drilling tool, characterized by: the novel cutting tool comprises a handle and a tool body, wherein the tool body is provided with a tool end, the tool end is provided with a first cutting edge, a second cutting edge and a chip pocket, the end of the first cutting edge forms a first tool nose, the end of the second cutting edge forms a second tool nose, and a third tool nose is arranged between the first tool nose and the second tool nose.

2. A carbon fiber drilling tool as defined in claim 1, wherein: the apex angle of the third tool nose is marked as alpha ₁ ，α ₁ Is in the range of 125 deg. to 135 deg..

3. A carbon fiber drilling tool as defined in claim 1, wherein: the apex angle of the first and second knife tips is marked as alpha ₂ ，α ₂ Ranging from 67 deg. to 72 deg..

4. A carbon fiber drilling tool as defined in claim 1, wherein: the included angle between the first knife tip and the third knife tip is marked as alpha ₃ ，α ₃ Also in the range 125 deg. to 135 deg..

5. A carbon fiber drilling tool as defined in claim 1, wherein: the included angle between the first knife tip or the second knife tip and the central line of the third knife tip is marked as alpha ₄ ，α ₄ Ranging from 12 ° to 15 °.

6. A carbon fiber drilling tool as defined in claim 1, wherein: the helix angle of the chip flute is marked as alpha ₅ ，α ₅ Also in the range 22 deg. to 27 deg..

7. A carbon fiber drilling tool as defined in claim 1, wherein: the chip flute extends to the tool body.

8. A carbon fiber drilling tool according to any one of claims 1-7, wherein: the heights of the first knife tip, the second knife tip and the third knife tip are consistent.

9. A feed rate of a carbon fiber drilling tool, characterized by: the feed speed is according to the following formula:

S＝1000Vc/π×D

F＝S×n×Z

wherein Vc refers to cutting speed, unit m/min, pi=3.14, D refers to cutter diameter, F refers to feed speed, S refers to spindle rotation speed, n refers to cutter blade number, Z=0.01-0.3;

the feeding speed of the cutter is 80-95% F.

10. The feed rate of a carbon fiber drilling tool of claim 9, wherein: the feed is processed in a spray environment.