Twist drill

Abstract

The utility model discloses a twist drill, which belongs to the field of hole machining tools and comprises a drill bit body. The other end of the drill point body is connected with one end of the drill bit body; the chisel edge is arranged at one end of the drill tip body; the two cutting edges are respectively arranged on two sides of one end of the drill tip body; the two chip grooves are formed in the two sides of one end of the drill tip body respectively; wherein the two sides of the chisel edge are correspondingly communicated with the two chip grooves, the two cutting edges are correspondingly communicated with the two chip grooves, and the angle B of the chisel edge is an obtuse angle or an acute angle along the first section D-D. The utility model has the technical effect that the processing efficiency is high.

Description

Technical Field

[0001] The utility model relates to a hole processing tool, in particular to a twist drill. Background Art

[0002] A twist drill is a tool for drilling circular holes in a workpiece by rotating and cutting relative to its fixed axis, and is widely used in the field of hole processing.

[0003] However, the centering stability of the related twist drill is poor. When drilling deep holes with a large length-diameter ratio, it is generally necessary to drill a pilot hole for centering first and then use the related twist drill for drilling, which easily leads to low processing efficiency. Summary of the Utility Model

[0004] Purpose of the Utility Model: The purpose of the utility model is to provide a twist drill, which is convenient for high processing efficiency.

[0005] Technical Solution: A twist drill includes:

[0006] A drill bit body;

[0007] A drill tip body, the other end of the drill tip body is connected to one end of the drill bit body;

[0008] A chisel edge provided at one end of the drill tip body;

[0009] Two cutting edges respectively provided on both sides of one end of the drill tip body;

[0010] Two chip flutes respectively provided on both sides of one end of the drill tip body;

[0011] Wherein, both sides of the chisel edge are correspondingly communicated with the two chip flutes, the two cutting edges are correspondingly communicated with the two chip flutes, and along the first cross-section D-D, the angle B of the chisel edge is an obtuse angle or an acute angle.

[0012] Optionally, the two flank faces corresponding to the two cutting edges are connected to form an integral flank face, the two flank faces are respectively provided on both sides of one end of the drill tip body, the chisel edge is connected between the two flank faces, and the shape of the integral flank face is S-shaped.

[0013] Optionally, the cutting edge includes a first chamfer and a second chamfer which are connected to each other, the first chamfer and the second chamfer are both provided at one end of the drill tip body, and one end of the first chamfer far from the second chamfer is connected to the chisel edge.

[0014] Optionally, the width L1 of the first chamfer is greater than the width L2 of the second chamfer, and the angle K1 of the first chamfer is greater than the angle K2 of the second chamfer.

[0015] Optionally, the chip removal groove includes a first groove body, a second groove body, and a third groove body that are connected in sequence. The first groove body, the second groove body, and the third groove body are all provided at one end of the drill tip body. The first groove body is connected to the web, and the first groove body, the second groove body, and the third groove body are all connected to the cutting edge.

[0016] Optionally, along the second cross-section U-U, the angle V1 of the first groove body is greater than the angle V2 of the second groove body.

[0017] Optionally, along the third cross-section F-F, the drill tip body is provided with at least two tip angles.

[0018] Optionally, along the first cross-section D-D, the angle B of the web is 100° - 175°.

[0019] Optionally, it further includes:

[0020] a shank connected to the other end of the drill bit body;

[0021] a first circumferential cutting band provided outside the drill bit body;

[0022] wherein, the first circumferential cutting band is connected to the chip removal groove.

[0023] Optionally, it further includes two internal cooling holes penetrating through the drill bit body and the drill tip body. Part of each internal cooling hole is located on the flank face, and the other part of each internal cooling hole is located on the rake face corresponding to the cutting edge.

[0024] Advantageous effects: The web is used for centering. Since along the first cross-section D-D, the angle B of the web is an obtuse angle or an acute angle, it is convenient to make the web have a certain taper, so that the centering stability of the drill tip of the present application is good. When drilling deep holes with a large length-diameter ratio, only the twist drill of the present application is needed to complete the drilling at one time, which is convenient for high processing efficiency. Among them, the angle B of the web is preferably an obtuse angle, specifically 100° - 175°, which is convenient to prevent the taper of the web from being too small, thereby preventing the web from breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is one of the partial views of a twist drill of the present invention;

[0026] Figure 2 is the second partial view of a twist drill of the present invention;

[0027] Figure 3 is Figure 2 the cross-sectional view of D-D in

[0028] Figure 4 is Figure 2 the cross-sectional view of U-U in

[0029] Figure 5 is Figure 2 the sectional view of F-F in

[0030] Figure 6 is Figure 2 the sectional view in the direction of C in

[0031] Figure 7 is Figure 6 the sectional view of E-E in

[0032] Figure 8 is Figure 6 the sectional view of G-G in

[0033] Figure 9 is the structural schematic diagram of a twist drill of the present utility model;

[0034] In the figure: 1, drill tip body; 11, chisel edge; 12, cutting edge; 121, first chamfer; 122, second chamfer; 13, chip flute; 131, first groove body; 132, second groove body; 133, third groove body; 14, integral flank; 15, flank; 16, rake face; 2, internal cooling hole; 3, drill bit body; 31, shank; 32, first circumferential cutting band. Specific embodiments

[0035] To make the technical solutions of the present utility model clearer, the following further describes the present utility model in detail with reference to the accompanying drawings and specific embodiments.

[0036] Embodiment 1

[0037] Combined with Figures 1-9 , this embodiment provides a twist drill, including: drill bit body 3; drill tip body 1, the other end of the drill tip body 1 is connected to one end of the drill bit body 3; chisel edge 11 provided at one end of the drill tip body 1; two cutting edges 12 respectively provided on both sides of one end of the drill tip body 1; two chip flutes 13 respectively provided on both sides of one end of the drill tip body 1; wherein, both sides of the chisel edge 11 communicate with the two chip flutes 13 correspondingly, the two cutting edges 12 communicate with the two chip flutes 13 correspondingly, and along the first section D-D, the angle B of the chisel edge 11 is an obtuse angle or an acute angle.

[0038] Specifically, the drill bit body 3 is used to carry the drill tip body 1; the drill tip body 1 is used to carry the web 11, two cutting edges 12, two chip flutes 13, etc.; the web 11 is used for centering. Since the angle B of the web 11 is an obtuse angle or an acute angle along the first cross-section D-D, it is convenient to make the web 11 have a certain taper, so that the centering stability of the drill tip of the present application is good. When drilling a deep hole with a large length-diameter ratio, only the twist drill of the present application is needed to complete the drilling at one time, and thus the processing efficiency is high. Among them, the angle B of the web 11 is preferably an obtuse angle, specifically 100°-175°, which is convenient to prevent the taper of the web 11 from being too small, so as to prevent the web 11 from breaking; the two cutting edges 12 are used for cutting; the two chip flutes 13 are used to correspondingly receive the waste chips from the two cutting edges 12, and the two chip flutes 13 are also used to receive the waste chips from the web 11.

[0039] Further, as Figures 1-2 , the two flank faces 15 corresponding to the two cutting edges 12 are connected to form an integral flank face 14. The two flank faces 15 are respectively arranged on both sides of one end of the drill tip body 1. The web 11 is connected between the two flank faces 15, and the shape of the integral flank face 14 is S-shaped.

[0040] Specifically, the S-shaped integral flank face 14 is convenient to increase the width of the web 11, so as to prevent the web 11 from breaking.

[0041] Further, as Figure 1 , the cutting edge 12 includes a first chamfer 121 and a second chamfer 122 that are connected to each other. The first chamfer 121 and the second chamfer 122 are both arranged at one end of the drill tip body 1, and the end of the first chamfer 121 far from the second chamfer 122 is connected to the web 11.

[0042] Specifically, both the first chamfer 121 and the second chamfer 122 are used for cutting.

[0043] Further, as Figures 6-8 , the width L1 of the first chamfer 121 is greater than the width L2 of the second chamfer 122, and the angle K1 of the first chamfer 121 is greater than the angle K2 of the second chamfer 122.

[0044] Specifically, the width L1 and the angle K1 of the first chamfer 121 are both relatively large, which is convenient to improve the edge strength of the cutting edge 12 and prevent the waste chips after the drill tip of the present application drills through from having central breakage and causing vibration.

[0045] Further, as Figure 1, the chip flute 13 includes a first groove body 131, a second groove body 132, and a third groove body 133 that are sequentially connected. The first groove body 131, the second groove body 132, and the third groove body 133 are all provided at one end of the drill tip body 1. The first groove body 131 is connected to the web 11, and the first groove body 131, the second groove body 132, and the third groove body 133 are all connected to the cutting edge 12.

[0046] Specifically, the first groove body 131 is used to receive waste chips from the web 11 and the cutting edge 12; both the second groove body 132 and the third groove body 133 are used to receive waste chips from the cutting edge 12.

[0047] Furthermore, as Figure 4 , along the second cross-section U-U, the angle V1 of the first groove body 131 is greater than the angle V2 of the second groove body 132.

[0048] Specifically, the angle V1 of the first groove body 131 is relatively large, which is equivalent to the thickness of the drill tip body 1 gradually increasing in the direction from one end to the other end of the drill tip body 1, presenting a variable core thickness design, which is convenient for increasing the chip evacuation smoothness of the first groove body 131 and the second groove body 132.

[0049] Furthermore, as Figure 5 , along the third cross-section F-F, the drill tip body 1 is provided with at least two apex angles.

[0050] Specifically, at least two apex angles are convenient for increasing the centering stability of the drill tip of the present application. When the drill tip body 1 is provided with two apex angles, the angle of the relatively smaller apex angle A1 is preferably 100° - 145°, and the angle of the relatively larger apex angle A2 is preferably 150° - 180°.

[0051] Furthermore, as Figure 3 , along the first cross-section D-D, the angle B of the web 11 is 100° - 175°.

[0052] Specifically, the angle B of the web 11 can specifically be 100°, 150°, or 175°, etc.

[0053] Furthermore, as Figure 9 , it further includes: a shank 31 connected to the other end of the drill bit body 3; a first circumferential cutting band 32 provided outside the drill bit body 3; wherein, the first circumferential cutting band 32 is connected to the chip flute 13.

[0054] Specifically, the shank 31 is used to cooperate with related drilling equipment; the first circumferential cutting band 32 is used for cutting, and waste chips are discharged through the chip flute 13.

[0055] Furthermore, as Figures 1-2, further comprising two internal cooling holes 2 penetrating the drill bit body 3 and the drill tip body 1, with a part of each internal cooling hole 2 located on the flank face 15 and the other part of each internal cooling hole 2 located on the rake face 16 corresponding to the cutting edge 12.

[0056] Specifically, the internal cooling holes 2 are used to pass coolant. Since a part of each internal cooling hole 2 is located on the flank face 15 and the other part of each internal cooling hole 2 is located on the rake face 16 corresponding to the cutting edge 12, it is convenient to make a part of the coolant in each internal cooling hole 2 flow to the flank face 15 and the other part of the coolant flow to the rake face 16 corresponding to the cutting edge 12, which is conducive to good cooling uniformity.

[0057] The above embodiments only represent several implementation manners of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. A twist drill, characterized in that, Comprising: The drill bit body; The drill tip body, with the other end of the drill tip body connected to one end of the drill bit body; The chisel edge provided at one end of the drill tip body; Two cutting edges respectively provided on both sides of one end of the drill tip body; Two chip flutes respectively provided on both sides of one end of the drill tip body; Wherein, both sides of the chisel edge communicate with the two chip flutes correspondingly, the two cutting edges communicate with the two chip flutes correspondingly, and along the first cross-section D-D, the angle B of the chisel edge is an obtuse angle or an acute angle.

2. The twist drill according to claim 1, characterized in that, The two flank faces corresponding to the two cutting edges are connected to form an integral flank face. The two flank faces are respectively provided on both sides of one end of the drill tip body. The chisel edge is connected between the two flank faces, and the shape of the integral flank face is S-shaped.

3. A twist drill according to claim 1 or 2, characterized in that, The cutting edge includes a first chamfer and a second chamfer connected to each other. The first chamfer and the second chamfer are both provided at one end of the drill tip body, and the end of the first chamfer away from the second chamfer is connected to the chisel edge.

4. A twist drill according to claim 3, characterized in that, The width L1 of the first chamfer is greater than the width L2 of the second chamfer, and the angle K1 of the first chamfer is greater than the angle K2 of the second chamfer.

5. A twist drill according to claim 1 or 2, characterized in that, The chip flute includes a first groove body, a second groove body and a third groove body that are sequentially communicated. The first groove body, the second groove body and the third groove body are all provided at one end of the drill tip body. The first groove body communicates with the chisel edge, and the first groove body, the second groove body and the third groove body all communicate with the cutting edge.

6. A twist drill according to claim 5, characterized in that, Along the second cross-section U-U, the angle V1 of the first groove body is greater than the angle V2 of the second groove body.

7. A twist drill according to claim 1 or 2, characterized in that, Along the third cross-section F-F, the drill tip body is provided with at least two tip angles.

8. A twist drill according to claim 1 or 2, characterized in that, Along the first cross-section D-D, the angle B of the chisel edge is 100° - 175°.

9. A twist drill according to claim 1 or 2, characterized in that, Further comprising: The shank connected to the other end of the drill bit body; The first circumferential cutting band provided outside the drill bit body; Wherein, the first circumferential cutting band communicates with the chip flute.

10. A twist drill according to claim 2, characterized in that, Further comprising two internal cooling holes penetrating through the drill bit body and the drill tip body. Part of each internal cooling hole is located on the flank face, and the other part of each internal cooling hole is located on the rake face corresponding to the cutting edge.

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