CN104028812A - Drill bit special for carbon fiber composite materials - Google Patents

Abstract

The invention provides a special drill bit which can reduce hole-making defects and exhibit excellent wear resistance and long service life in the cutting process of carbon fiber composite materials. The special drill bit for carbon fiber composite material of the present invention comprises: a cutter bar, the cutter bar has two spiral grooves, and the edge of the grooves has a chamfered structure. The tail of the groove is the drill body. The main body of the drill bit has two stages of main flanks; the first stage of the main flank forms the first heavy front angle, the first stage of the main flank has a longer chisel edge, and adopts a reinforced core thickness; The second-stage main flanks form a circular arc-shaped second heavy front angle, and the two-stage main flanks form a longer main cutting edge. The ends of the two-stage main flanks are chip splitters. The edges of the drill body are two outer cutting edges. The drill bit can be used in cutting processing, can reduce hole-making defects, has better wear resistance and has longer service life.

Description

Special drill bit for carbon fiber composite material

technical field

The patent of the invention relates to the design of a special drill bit structure, and belongs to the field of carbon fiber composite material processing.

Background technique

Drilling is currently the main method for processing carbon fiber composite materials, but during drilling, due to the difference in the strength of the interlayer binder and the strength of the fiber itself and the different performances of the fiber and the cutting edge angle, resulting in Defects such as burrs, tears, and delamination are prone to occur when drilling.

At present, twist drills are mostly used for drilling carbon fiber composite materials, and the cutting parameters of carbon fiber composite materials are selected with reference to the cutting parameters of drilling metal materials or the cutting parameters are improved to a certain extent. The problems of surface peeling, burring and resin fiber chipping lead to a large amount of tool wear and a short tool life.

Therefore, special design of carbon fiber composite processing tools is required.

Contents of the invention

The object of the present invention is to provide a special drill bit for carbon fiber composite materials. Through the design of the drill bit, it can overcome the problems of serious tool wear and low hole processing quality in the process of processing.

The special drill bit for carbon fiber composite materials proposed by the present invention has a main body of a cutter bar 1, and the cutter bar 1 is a cylindrical structure, and two spiral grooves 2 are evenly arranged on the cutter bar 1, and the cutter bar 1 and the two grooves 2 together form a twist-like structure, the tail of the cutter bar 1 is the drill body 4, wherein:

The drill body 4 includes a first-stage main flank 5 and a second-stage main flank 9. The first-stage main flank 5 has four pieces in total, which are located in the middle of the end of the drill body 4. The first stage The main flanks 5 intersect in pairs to form an umbrella structure. The intersection line between the two first-stage main flanks 5 on the left and the two knife planes on the right forms a chisel edge 7, and the two on the left There is an included angle of 112° between the first-stage main flank 5 and the two first-stage main flanks on the right. The included angle constitutes the first heavy front angle 8, and the second-stage main flank 9 has Two pieces, one of which is located on the periphery of the two first-stage main cutter faces 5 on the left, and the other is located on the periphery of the two first-stage main cutter faces 5 on the right, and the second-stage main relief surface 9 is connected to the first-stage main cutter surface 5 The connection constitutes a second heavy front angle 10; the end of the second-stage main flank 9 is a chip breaker 12; the first heavy front angle 8 has a larger angle, and the second heavy front angle 10 has a smaller angle; The larger first heavy front angle 8 is brittle in the axial direction and destroys the internal texture of the carbon fiber composite material, and the smaller second heavy front angle 10 can enhance the hole-making ability, reduce the cutting force, and effectively shear The interlayer structure of the material alleviates the problem of delamination; the outer edge of the drill body, that is, the area other than the groove of the cutter bar 1, is provided with a first cutting edge 13 and a second cutting edge 14, and the first cutting edge 13 is located below the chip splitting groove 12 , The angle between the first cutting edge 13 and the second cutting edge 14 is 120°; the first cutting edge 13 and the second cutting edge 14 can perform outer edge cutting, which can prevent cracks and wear during the cutting process.

In the present invention, both sides of the groove 2 have a chamfered drill body structure, which can strengthen the strength of the blade and avoid collapse.

In the present invention, the second-stage main flank surface 9 adopts an arc-shaped structure, which is beneficial to cutting flow.

In the present invention, the chip dividing groove 1 at the tail end of the second-stage main flank surface 9 has a pot-shaped structure, which is beneficial to chip removal and cutting fluid inflow.

In the present invention, the chisel edge 7 adopts a reinforced core thickness structure. The reinforced core thickness can prevent the drill bit from bending deformation due to torsion and vibration, and prolong the service life of the tool to a certain extent.

In the present invention, the material of the drill bit is polycrystalline diamond (PCD).

The beneficial effect of the present invention is that: the drill bit can be applied in cutting processing, can reduce hole-making defects, has better wear resistance, and has longer service life.

Description of drawings

Fig. 1 is a front view of a special drill bit for carbon fiber composite materials provided by the present invention.

Fig. 2 is a top view of the special drill bit for carbon fiber composite material provided by the present invention.

Fig. 3 is a rotating view of the special drill bit for carbon fiber composite materials provided by the present invention.

Numbers in the figure: 1 is the tool holder, 2 is the groove, 3 is the chamfered drill body structure, 4 is the main body of the drill bit, 5 is the first-stage main flank, 6 is the left sides of the first-stage main flank 7 is the chisel edge, 8 is the first heavy front angle, 9 is the second level main flank, 10 is the second heavy front angle, 11 is the reinforcing core, 12 is the chip splitter, and 13 is the The first cutting edge, 14 is the second cutting edge.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

Example 1:

The special drill bit for carbon fiber composite materials is shown in Figure 1-3. It is composed of a cutter bar 1 and a drill body 4. The cutter bar 1 has a cylindrical structure. There are two spiral grooves 2 evenly opened on the cutter bar 1. Each groove The two sides of the groove 2 are designed as a chamfered drill body structure 3, and the cutter bar 1 and the groove 2 together form a twist-shaped overall structure.

The drill body 4 includes a first-stage main flank 5 and a second-stage main flank 9. There are four first-stage main flanks 5, which are located in the middle of the ends of the drill body 4. The first-stage main flank 5 intersect in pairs to form an umbrella structure, the intersection line between the two first-stage main flanks 5 on the left and the two blade planes on the right forms a chisel edge 7, and the two first-stage main blades on the left There is an included angle of 112° between the surface 5 and the two first-stage main flanks on the right, and the included angle forms the first heavy front angle 8. There are two second-stage main flanks 9, one of which is located on the left The two first-stage main cutter faces 5 are peripheral, the other one is located on the right side of the two first-stage main cutter faces 5, and the connection between the second-stage main relief face 9 and the first-stage main cutter face 5 constitutes the second heavy front angle 10; the end of the second-stage main flank 9 is a chip splitter 12; the angle of the first heavy front angle 8 is relatively large, and the angle of the second heavy front angle 10 is small; the larger first heavy front angle 8 is on the axis The internal texture of the carbon fiber composite material is destroyed towards brittle fracture, and the smaller second heavy front angle 10 can enhance the hole-making ability, reduce the cutting force, effectively shear the interlayer structure of the material, and alleviate the delamination problem; the outer edge of the drill bit is The area outside the groove of the tool holder 1 is provided with a first cutting edge 13 and a second cutting edge 14, the first cutting edge 13 is located below the chip divider 12, and the angle between the first cutting edge 13 and the second cutting edge 14 is 120° ; The first cutting edge 13 and the second cutting edge 14 can cut the outer edge, which can prevent the phenomenon of cracking and wear during the cutting process.

In the present invention, both sides of the groove 2 have a chamfered drill body structure, which can strengthen the strength of the blade and avoid collapse. The second-stage main flank 9 adopts an arc-shaped structure, which is beneficial to the cutting flow. The chip dividing groove 1 at the tail end of the second-stage main flank surface 9 has a pot-shaped structure, which is beneficial to chip removal and the inflow of cutting fluid. The chisel edge 7 adopts a reinforced core-thick structure. The reinforced core thickness can prevent the drill bit from bending deformation due to torsion and vibration, and prolong the service life of the tool to a certain extent.

The special drill bit for carbon fiber composite material of the present invention is respectively designed with a first cutting edge 13 and a second cutting edge 14 on the edge of the drill body.

The drill bit can be used in cutting processing, can reduce hole-making defects, has better wear resistance and has longer service life.

Claims (5)

1. carbon fibre composite target drill, its main body is knife bar (1), described knife bar (1) is column construction, two spiral grooves (2) on knife bar (1), have been evenly arranged, knife bar (1) forms twisted shape structure jointly with two grooves (2), the afterbody of described knife bar (1) is drill main body (4), it is characterized in that:

Described drill main body (4) comprises after the first order master knife face (9) after knife face (5) and second level master, knife face after described first order master (5) has four, be positioned at the centre of drill main body (4) end, knife face after first order master (5) intersects formation umbrella-shaped structure between two, be positioned at knife face (5) and the intersection between two cutter planes on the right after two first order masters on the left side and form chisel edge (7), and be positioned at two first order operator faces (5) on the left side and between knife face, be 112 ° of angles after two first order masters on the right, described angle forms the first heavy sharp angle (8), after described second level master, knife face (9) has two, wherein a slice is positioned at two first order operator face (5) peripheries on the left side, another sheet is positioned at two first order operator face (5) peripheries on the right, and knife face after the master of the second level (9) forms the second heavy sharp angle (10) with the junction of first order operator face (5), after described second level master, knife face (9) end is chip dividing groove (12), the angle of the described first heavy sharp angle (8) is larger, and the second heavy sharp angle (10) angle is less, described the first larger heavy sharp angle (8) destroys the inside texture of carbon fibre composite in axial brittle failure, described the second less heavy sharp angle (10) can strengthen drilling ability, reduces cutting force, effectively shears material interlayer structure, alleviates lamination problem, described drill main body outer rim is that the region beyond knife bar 1 groove is provided with the first cutting edge (13) and the second cutting edge (14), the first cutting edge (13) is positioned at chip dividing groove (12) below, and the first cutting edge (13) and the second cutting edge (14) angle are 120 °, described the first cutting edge (13) and the second cutting edge (14) can carry out outer rim cutting, and what can prevent from occurring in working angles breaks and the phenomenon such as wearing and tearing.

2. target drill according to claim 1, is characterized in that described groove (2) both sides are chamfering shape drill body structure, can strengthen edge strength, avoids collapsing damage.

3. target drill according to claim 1, it is characterized in that described second level master after knife face (9) adopt arc structure, be conducive to the shunting of cutting.

4. target drill according to claim 1, is characterized in that the chip dividing groove (1) of the tail end of knife face (9) after described second level master is a pot shape structure, is conducive to the inflow of chip removal and cutting fluid.

5. target drill according to claim 1, is characterized in that described chisel edge (7) adopts the core thick structure of strengthening, and the core of described reinforcement is thick can prevent drill bit because reverse and vibration flexural deformation, and extends to a certain extent the service life of cutter.