Drill bit with deep cutting groove

Abstract

The utility model relates to the technical field of drill bits, in particular to a drill bit with a deep cutting groove, which comprises a drill point, a spiral chip groove extending along the axis direction is arranged on the surface of the drill point, a rear cutter face is formed at the end of the drill point, and the spiral strip-shaped deep cutting groove is arranged on one side of the spiral chip groove close to the rear cutter face. According to the drill bit, the spiral strip-shaped deep cutting groove is deeply formed in the smooth arc surface of the original spiral chip removal groove, chip removal is more layered, and therefore the chip removal efficiency is improved, the tail end of the deep cutting groove extends to the rear tool face so that a notch can be formed in the edge of the rear tool face, the hardness and sharpness of the rear tool face of the drill bit are greatly improved, and the service life of the rear tool face of the drill bit is greatly prolonged. Therefore, the drill bit is not easy to break and damage.

Description

TECHNICAL FIELD

[0001] The utility model relates to drill bit technical field, concretely relates to a drill bit with deep cutting groove. BACKGROUND

[0002] The existing drill bit's flank is the inclined end face at the end of the drill needle, the flank directly connects with the spiral chip removal groove, when drilling, the waste cutting produced by the flank cutting is discharged to the outside through the spiral chip removal groove, but the structure setting makes the chip removal efficiency of the spiral chip removal groove general, and the hardness, sharpness and life of the flank of the drill bit need to be improved, and the drill bit is prone to breakage and damage. SUMMARY

[0003] The utility model aims at providing a drill bit with deep cutting groove to solve the above-mentioned technical problem.

[0004] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a drill bit with deep cutting groove, comprising a drill needle, the surface of the drill needle is provided with a spiral chip removal groove extending along the axial direction, the end of the drill needle forms a flank, a spiral strip-shaped deep cutting groove is formed on one side of the spiral chip removal groove close to the flank, and the end of the deep cutting groove extends to the flank to form a notch on the edge of the flank.

[0005] Preferably, the deep cutting groove is located in the middle region of the width direction of the spiral chip removal groove, and the spiral angle of the deep cutting groove is the same as the spiral angle of the spiral chip removal groove.

[0006] Preferably, the ratio of the width of the deep cutting groove to the width of the spiral chip removal groove ranges from 1 / 5 to 1 / 3.

[0007] Preferably, the flank comprises a first flank and a second flank connected with each other, the first flank and the second flank are gradually inclined downward in the direction away from each other, and the end of the deep cutting groove extends to the second flank to form a notch on the edge of the second flank.

[0008] Preferably, the notch is an arc-shaped notch on the edge of the second flank close to the first flank.

[0009] Preferably, the inclination of the second flank is greater than the inclination of the first flank.

[0010] Preferably, the area of the second flank is greater than the area of the first flank.

[0011] Preferably, the drill bit is a single-blade drill bit or a double-blade drill bit.

[0012] Preferably, the drill bit is a single-blade drill bit, the helical flute comprises a main helical flute and a secondary helical flute, the deep flute is located on one side of the helical flute close to the clearance face, the length of the main helical flute is greater than the length of the secondary helical flute, the secondary helical flute is located at the end of the drill bit, the edge blade close to one side of the main helical flute of the first clearance face is the main cutting edge, and the blade belt is formed between the main helical flute and the secondary helical flute.

[0013] Preferably, the drill bit is a double-blade drill bit, and the helical flute, the clearance face and the deep flute are centrally symmetrically arranged.

[0014] The drill bit has the following beneficial effects:

[0015] The utility model discloses a drill bit, the surface of drill bit is provided with the helical flute that extends along the axial direction, the end of drill bit forms the clearance face, the helical flute is close to the clearance face on one side and is equipped with the deep flute of spiral strip, namely the helical flute of smooth arc face is deepened and is equipped with the deep flute of spiral strip on originally, and the deep flute is more hierarchical to arrange the chip, thereby improving the chip removal efficiency, and the end of deep flute extends to the clearance face to make the edge of clearance face form the notch, make the hardness, sharpness and life of the clearance face of drill bit have been greatly promoted, thereby making the drill bit not easy to appear the broken edge, the damage condition. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the appearance schematic drawing and the local enlarged schematic drawing of the embodiment of the utility model under one angle.

[0017] Figure 2 It is the appearance schematic drawing and the local enlarged schematic drawing of the embodiment of the utility model under another angle.

[0018] Figure 3 It is the appearance schematic drawing and the local enlarged schematic drawing of the embodiment of the utility model under another angle.

[0019] Figure 4 It is the plan view of the drill bit of the embodiment of the utility model.

[0020] Fig. 1 is a drill handle, 2 is a drill bit, 3 is a helical flute, 31 is a main helical flute, 32 is a secondary helical flute, 4 is a deep flute, 41 is a notch, 5 is a clearance face, 51 is a first clearance face, 52 is a second clearance face, 6 is a main cutting edge, and 7 is a blade belt. DETAILED DESCRIPTION

[0021] To further illustrate the embodiments, the utility model provides has the drawing. These drawings are part of the utility model disclosure, which is mainly used to illustrate the embodiments, and can be combined with the related description of the specification to explain the operating principle of the embodiments. With reference to these contents, those skilled in the art should understand other possible implementations and the advantages of the utility model. The components in the figure are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0022] In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more than two; The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the utility model, it should be pointed out that, unless otherwise specified and limited, the terms "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; It can be mechanical connection, or electrical connection; It can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0024] Reference Figures 1-4 As shown in the figure, as an embodiment of the utility model, a drill bit with deep grooves is provided, which comprises a drill handle 1 and a drill needle 2 coaxially arranged, the surface of the drill needle 2 is provided with a spiral flute 3 extending along the axial direction, the end of the drill needle 2 (i.e. the end of the drill needle 2 away from the drill handle 1) is formed with a relief surface 5, a spiral strip-shaped deep groove 4 is formed on one side of the spiral flute 3 close to the relief surface 5, that is, a spiral strip-shaped deep groove 4 is formed on the smooth arc surface of the original spiral flute 3, the chip removal is more hierarchical, thereby improving the chip removal efficiency, and the end of the deep groove 4 extends to the relief surface 5 to form a notch 41 at the edge of the relief surface 5, thereby greatly improving the hardness, sharpness and service life of the relief surface 5 of the drill bit, so that the drill bit is not prone to chipping and damage.

[0025] In this embodiment, the deep groove 4 is located in the middle region of the width direction of the spiral flute 3, and the spiral angle of the deep groove 4 is the same as that of the spiral flute 3, so as to ensure the consistency of the chip removal direction, thereby further improving the chip removal efficiency.

[0026] In the embodiment, the ratio of the width of the deep groove 4 to the width of the helical flute 3 is in the range of 1 / 5 to 1 / 3, and specifically 1 / 4, so that the performance of chip removal, hardness, sharpness and service life of the drill bit are all in the most ideal state.

[0027] In the embodiment, the relief surface 5 comprises a first relief surface 51 and a second relief surface 52 which are connected to each other and are gradually inclined downward in a direction away from each other, and the end of the deep groove 4 extends to the second relief surface 52 so that the edge of the second relief surface 52 forms a notch 41. Specifically, the notch 41 is an arc-shaped notch 41 at the edge of the second relief surface 52 near the first relief surface 51, i.e. the notch 41 is near the tip area of the middle part of the drill bit, which is beneficial to cutting and chip removal, while ensuring the strength of the drill bit as a whole, thereby prolonging the service life.

[0028] In the embodiment, the drill bit is a single-edge drill bit, the helical flute 3 comprises a main helical flute 31 and a secondary helical flute 32, the deep groove 4 is located on the side of the helical flute 3 near the relief surface 5, the length of the main helical flute 31 is greater than that of the secondary helical flute 32, the secondary helical flute 32 is located at the end of the drill bit 2, and the higher edge of the first relief surface 51 near the main helical flute 31 is the main cutting edge 6 which plays a major cutting role in drilling work. The blade band 7 is formed between the main helical flute 31 and the secondary helical flute 32, which plays a guiding and extruding role.

[0029] Of course, in other embodiments, the drill bit can also be a double-edge drill bit, and correspondingly, the helical flute, the deep groove, the first relief surface and the second relief surface are respectively two center-symmetrically arranged.

[0030] Although the present application is specifically shown and described in connection with the preferred embodiments, those skilled in the art should understand that various changes in form and details can be made to the present application without departing from the spirit and scope of the present application as defined in the appended claims.

Claims

1. A drill bit with a deep groove, characterized in that: The drill bit includes a helical chip removal groove extending along the axial direction on its surface. A flank face is formed at the end of the drill bit. A helical deep groove is formed on the side of the helical chip removal groove near the flank face, and the end of the deep groove extends to the flank face so that the edge of the flank face forms a notch.

2. The drill bit with deep grooves according to claim 1, characterized in that: The deep groove is located in the middle region of the width direction of the spiral chip conveyor, and the helix angle of the deep groove is the same as that of the spiral chip conveyor.

3. The drill bit with deep grooves according to claim 1, characterized in that: The ratio of the width of the deep groove to the width of the spiral chip conveying groove is in the range of 1 / 5 to 1 / 3.

4. The drill bit with deep grooves according to claim 1, characterized in that: The flank face includes a first flank face and a second flank face that are in contact with each other. The first flank face and the second flank face are gradually inclined downward in a direction that moves away from each other, and the end of the deep groove extends to the second flank face so that the edge of the second flank face forms a notch.

5. The drill bit with deep grooves according to claim 4, characterized in that: The notch is an arc-shaped notch located on the edge of the second flank face near the first flank face.

6. The drill bit with deep grooves according to claim 4, characterized in that: The inclination of the second flank face is greater than that of the first flank face.

7. The drill bit with deep grooves according to claim 4, characterized in that: The area of ​​the second flank face is larger than the area of ​​the first flank face.

8. The drill bit with deep grooves according to claim 1, characterized in that: The drill bit is either a single-flute drill bit or a double-flute drill bit.

9. The drill bit with deep grooves according to claim 4, characterized in that: The drill bit is a single-edged drill bit. The helical chip removal groove includes a main helical chip removal groove and a secondary helical chip removal groove. The deep cutting groove is located on the side of the helical chip removal groove near the flank face. The length of the main helical chip removal groove is greater than the length of the secondary helical chip removal groove. The secondary helical chip removal groove is located at the end of the drill bit. The edge edge of the first flank face near the main helical chip removal groove is the main cutting edge. A cutting edge band is formed between the main helical chip removal groove and the secondary helical chip removal groove.

10. The drill bit with deep grooves according to claim 1, characterized in that: The drill bit is a double-edged drill bit, with the spiral chip removal groove, the flank face, and the deep cutting groove arranged in two centrally symmetrical positions.

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