A type of drill bit

Abstract

This utility model relates to a drill bit, comprising a drill rod, at least one chip removal groove spirally recessed from the outer peripheral wall of the drill rod, and a cutting edge located at the end of the drill rod. The chip removal groove includes a bottom wall and side walls located on both sides of the bottom wall. The bottom wall has multiple anti-clogging surfaces, which can be planar or curved. The multiple anti-clogging surfaces on the bottom wall of the chip removal groove disrupt the continuity of the spiral, thus forming a discontinuous curved surface structure. The cross-sectional dimension of the chip removal groove at the edge of the anti-clogging surface is smaller than the cross-sectional dimension at the center of the anti-clogging surface. As the chips move along the chip removal groove, the cross-section changes alternately, thereby reducing the phenomenon of chips squeezing and clogging the chip removal groove and improving the chip removal effect.

Description

Technical Field

[0001] This utility model relates to the field of drilling technology, and in particular to a drill bit. Background Technology

[0002] Drill bits are used for drilling to create holes in workpieces. The front end of the drill bit is equipped with a cutting edge for cutting, and the resulting chips are discharged through chip evacuation grooves on the drill rod. Existing chip evacuation grooves employ a continuous helical structure, with a cross-section of a C-shaped or U-shaped continuous smooth curved surface. For example, document CN207026552U discloses a carbide drill bit in which the chip evacuation groove is a helical arc-shaped groove.

[0003] Metal chips generated during drilling enter the chip removal groove. Because the cross-sectional dimensions of the arc-shaped groove are uniform and it is a continuous and smooth curved surface, the chips are easily squeezed and blocked, increasing the difficulty of chip removal. The chips can also squeeze the borehole, affecting the quality of the hole wall and increasing the resistance experienced by the drill bit, posing a risk of drill bit breakage. Therefore, improvements are needed. Utility Model Content

[0004] To overcome the problems existing in related technologies, this utility model provides a drill bit to solve the technical problems of chip compression clogging the chip discharge groove, high drilling resistance, and low drilling quality.

[0005] According to a first aspect of the present invention, a drill bit is provided, the drill bit including a drill rod, at least one chip removal groove spirally recessed from the outer peripheral wall of the drill rod, and a cutting edge provided at the end of the drill rod. The chip removal groove includes a bottom wall and side walls located on both sides of the bottom wall. The bottom wall is provided with a plurality of anti-clogging surfaces, the anti-clogging surfaces including planes or curved surfaces.

[0006] In one embodiment, an intersecting line is formed between two adjacent anti-blocking surfaces, and the minimum distance of the intersecting line from the outer peripheral wall of the drill pipe is smaller than the minimum distance of the anti-blocking surface from the outer peripheral wall of the drill pipe.

[0007] In one embodiment, the anti-clogging surface is set as a plane, and the inclination direction of the anti-clogging surface is parallel to the tangential direction of the chip removal groove.

[0008] In one embodiment, the intersection of two adjacent anti-blocking surfaces is at least partially misaligned.

[0009] In one embodiment, two or more chip removal grooves are provided.

[0010] In one embodiment, the cutting edge includes at least one main cutting edge fixed to the end of the drill rod, and one end of the chip removal groove and one side of the main cutting edge are spaced apart.

[0011] In one embodiment, the radius of rotation of the main cutting edge is greater than the radius of the drill rod.

[0012] In one embodiment, the cutting edge further includes a secondary cutting edge fixed to the end of the drill rod, the secondary cutting edge and the main cutting edge being spaced apart, and a chip removal groove being provided between the secondary cutting edge and the main cutting edge.

[0013] In one embodiment, the drill bit further includes an auxiliary groove disposed on the drill rod, the auxiliary groove being parallel to the centerline of the drill rod, and the secondary cutting edge being located between the auxiliary groove and the chip removal groove.

[0014] In one embodiment, the secondary blade comprises two oppositely arranged blades, the first included angle between the line connecting the centers of the two secondary blades and the primary blade is greater than 90 degrees, and the auxiliary groove is located within the range of the first included angle.

[0015] The technical solution provided by the embodiments of this utility model can include the following beneficial effects: The bottom wall of the chip removal groove is provided with multiple anti-clogging surfaces. These anti-clogging surfaces disrupt the continuity of the spiral, thus forming a discontinuous curved surface structure. The cross-sectional dimension of the chip removal groove at the edge of the anti-clogging surface is smaller than the cross-sectional dimension at the center of the anti-clogging surface. As the chips move along the chip removal groove, the cross-section changes alternately, thereby reducing the phenomenon of chips squeezing and clogging the chip removal groove, and improving the chip removal effect. Smooth chip removal by the drill bit can improve drilling quality and reduce drilling resistance. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0017] Figure 1 This is a structural schematic diagram showing the first angle of the drill bit according to an embodiment.

[0018] Figure 2 This is a structural schematic diagram showing the second angle of the drill bit according to one embodiment.

[0019] Figure 3 This is a schematic cross-sectional view of a drill bit according to one embodiment.

[0020] Figure 4 This is a schematic diagram of the end face of a drill bit according to one embodiment.

[0021] In the figure, drill rod 10; chip removal groove 20; groove bottom wall 21; anti-clogging surface 211; groove side wall 212; intersecting line 213; straight groove 214; auxiliary groove 215; cutting edge 30; main cutting edge 31; secondary cutting edge 32; assembly end 40. Detailed Implementation

[0022] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0023] like Figures 1 to 4 As shown, this utility model provides a drill bit, which includes a drill rod 10, at least one chip removal groove 20 spirally recessed on the outer peripheral wall of the drill rod 10, and a cutting edge 30 located at the end of the drill rod 10. The chip removal groove 20 has a spiral recessed structure and can be one or more. The chip removal groove 20 is distributed along the surface of the drill rod 10 to discharge chips generated by the cutting edge 30 during drilling. Preferably, two or more chip removal grooves 20 are provided to improve chip removal efficiency.

[0024] The chip removal groove 20 includes a bottom wall 21 and side walls 212 located on both sides of the bottom wall 21. The bottom wall 21 is provided with multiple anti-clogging surfaces 211, which may be planar or curved. In a preferred embodiment, the anti-clogging surface 211 is a planar surface, and its inclination direction is parallel to the tangential direction of the chip removal groove 20. The anti-clogging surface 211 is tangentially inclined along the spiral line of the chip removal groove 20 to conform to the direction of chip movement. In a preferred embodiment, the anti-clogging surface 211 is a concave curved surface or a convex curved surface.

[0025] The chip removal groove 20 has a U-shaped or C-shaped structure, and the bottom wall 21 is the bottom surface of the chip removal groove 20. Multiple anti-clogging surfaces 211 are provided on the bottom wall 21 of the chip removal groove 20. These anti-clogging surfaces 211 disrupt the continuity of the spiral, thus forming a discontinuous curved surface structure. The cross-sectional dimension of the chip removal groove 20 at the edge of the anti-clogging surface 211 is smaller than the cross-sectional dimension at the center of the anti-clogging surface 211. As the chips move along the chip removal groove 20, the cross-section changes alternately, thereby reducing the phenomenon of chips squeezing and clogging the chip removal groove 20 and improving the chip removal effect.

[0026] In addition, smooth chip removal from the drill bit can improve drilling quality and reduce drilling resistance.

[0027] Two adjacent anti-clogging surfaces 211 can be distributed at intervals on the bottom wall 21 of the groove to form the continuity of the discontinuous broken surface and improve the chip removal effect.

[0028] Further preferably, two adjacent anti-clogging surfaces 211 intersect, such that the anti-clogging surfaces 211 are arranged to intersect sequentially along the bottom wall 21 of the groove, and the anti-clogging surfaces 211 constitute the surface of the bottom wall 21 of the groove. The anti-clogging surfaces 211 are distributed along the spiral extension direction of the chip removal groove 20, and two adjacent anti-clogging surfaces 211 intersect to form an intersection line 213. Since the chip removal groove 20 is spiral, the intersection portion formed by the intersection of two anti-clogging surfaces 211 has a relatively convex structure.

[0029] The anti-clogging surface 211 is designed as a plane. When the bottom wall 21 of the groove is leveled, the distance between the center of the anti-clogging surface 211 and the outer peripheral wall of the drill rod 10 is maximized. Correspondingly, the minimum dimension of the distance between the intersecting line 213 and the outer peripheral wall of the drill rod 10 is smaller than the minimum dimension of the anti-clogging surface 211 and the outer peripheral wall of the drill rod 10. This allows the chips to pass through the chip removal groove 20, whose cross-sectional dimensions change repeatedly, greatly reducing the disadvantages of chip compression and clogging and improving the smoothness of chip removal.

[0030] Furthermore, the intersection of two adjacent anti-clogging surfaces 211 is at least partially misaligned, and the anti-clogging surface 211 is an inclined surface that changes in the direction of the spiral. The misalignment of the intersection of two adjacent anti-clogging surfaces 211 due to the change in the inclination angle can further flip and change the direction of the debris in the chip discharge groove 20, thereby reducing the risk of debris squeezing and clogging the chip discharge groove 20.

[0031] like Figure 1 and Figure 4 As shown, the cutting edge 30 is located at the end of the drill bit, and the cutting edge 30 is the cutting part at the end of the drill rod 10.

[0032] In one embodiment, the cutting edge 30 includes at least one main cutting edge 31 fixed to the end of the drill rod 10, with one end of the chip removal groove 20 and one side of the main cutting edge 31 spaced apart. The main cutting edge 31 is made of cemented carbide and fixed to the drill rod 10 to form an integral structure. Preferably, the main cutting edge 31 is a single piece, and the end of the main cutting edge 31 has a V-shaped cutting edge to improve cutting positioning accuracy.

[0033] Optionally, two main cutting edges 31 are provided, and the two main cutting edges 31 are in the same plane. The two main cutting edges 31 can cut the center line of the workpiece.

[0034] The end of the chip removal groove 20 is located on one side of the main cutting edge 31 to form a chip removal structure. Preferably, the end of the chip removal groove 20 is a straight groove 214, which is parallel to the center line of the drill rod 10.

[0035] In one embodiment, the radius of rotation of the main cutting edge 31 is greater than the radius of the drill rod 10, allowing for precise control of the drilled hole from the side of the main cutting edge 31, and allowing chips to be discharged along the chip removal groove 20. Preferably, the front end of the main cutting edge 31 is V-shaped to provide center positioning. More preferably, side cutting edges are provided on both sides of the main cutting edge 31, which cut the hole wall to achieve hole wall finishing.

[0036] In one embodiment, the cutting edge 30 further includes a secondary cutting edge 32 fixed to the end of the drill rod 10, the secondary cutting edge 32 being located between the auxiliary groove 215 and the chip removal groove 20. The secondary cutting edge 32 and the main cutting edge 31 are spaced apart, and the chip removal groove 20 is provided between the secondary cutting edge 32 and the main cutting edge 31. The secondary cutting edges 32 are distributed laterally on the drill rod 10, and the rotation diameter of the secondary cutting edge 32 is greater than or equal to the rotation diameter of the main cutting edge 31, so as to achieve hole wall finishing.

[0037] Preferably, multiple chip removal grooves 20 are provided, and two chip removal grooves 20 intersect with each other in the auxiliary groove 215.

[0038] Preferably, the main cutting edge 31 has a straight-line structure to form a first straight line. The secondary cutting edges 32 include two oppositely arranged blades 32, which are arranged in a straight line to form a second straight line. The first and second straight lines form an X-shaped structure.

[0039] Preferably, the first angle between the center line connecting the two secondary cutting edges 32 and the main cutting edge 31 is greater than 90 degrees, that is, the angle between the first and second lines is acute on one side and obtuse on the other side, and the straight groove 214 of the chip removal groove 20 is located in the area corresponding to the acute angle. The chips cut by the main cutting edge 31 can enter along the chip removal groove 20, and the secondary cutting edges 32 can cut and finish the hole wall.

[0040] In one embodiment, the drill bit further includes an auxiliary groove 215 disposed on the drill rod 10, the auxiliary groove 215 being parallel to the centerline of the drill rod 10. The auxiliary groove 215 and the straight groove 214 are disposed in parallel and can be distributed at intervals along the circumference of the drill rod 10 to improve the chip removal effect.

[0041] The auxiliary groove 215 and the chip removal groove 20 intersect, forming a near-Y-shaped structure in some areas. The secondary cutting edge 32 is located on the drill rod 10 within the area surrounded by the intersection of the auxiliary groove 215 and the chip removal groove 20. Specifically, the secondary cutting edge 32 is located within the Y-shaped area.

[0042] Further preferably, the auxiliary groove 215 is located within the first included angle range, the auxiliary groove 215 is provided with an arc-shaped curved surface, and the opening width of the auxiliary groove 215 is greater than the opening width of the straight groove 214.

[0043] In one embodiment, the drill pipe 10 is made of an alloy material.

[0044] In one embodiment, one end of the drill rod 10 is provided with an assembly end 40, and the assembly end 40 is provided with an assembly part. The assembly end 40 can be plugged into and connected to a drilling device, and the assembly part can transmit torque. The assembly part can be configured as a transmission groove or a transmission plane.

[0045] It should be understood that this invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this invention is limited only by the appended claims.

Claims

1. A drill bit, comprising a drill rod, at least one chip removal groove spirally recessed from the outer peripheral wall of the drill rod, and a cutting edge disposed at the end of the drill rod, characterized in that, The chip removal groove includes a bottom wall and side walls located on both sides of the bottom wall. The bottom wall is provided with multiple anti-clogging surfaces, which may be planar or curved. An intersecting line is formed between two adjacent anti-blocking surfaces, and the minimum distance between the intersecting line and the outer peripheral wall of the drill pipe is smaller than the minimum distance between the anti-blocking surface and the outer peripheral wall of the drill pipe.

2. The drill bit according to claim 1, characterized in that, The anti-clogging surface is set as a plane, and the inclination direction of the anti-clogging surface is parallel to the tangential direction of the chip removal groove.

3. The drill bit according to claim 2, characterized in that, The intersection of two adjacent blocking surfaces is at least partially misaligned.

4. The drill bit according to claim 1, characterized in that, The chip removal groove is provided in two or more ways.

5. The drill bit according to any one of claims 1 to 4, characterized in that, The cutting edge includes at least one main cutting edge fixed to the end of the drill rod, and one end of the chip removal groove and one side of the main cutting edge are spaced apart.

6. The drill bit according to claim 5, characterized in that, The radius of rotation of the main cutting edge is greater than the radius of the drill rod.

7. The drill bit according to claim 5, characterized in that, The cutting edge also includes a secondary cutting edge fixed to the end of the drill rod. The secondary cutting edge and the main cutting edge are spaced apart, and a chip removal groove is provided between the secondary cutting edge and the main cutting edge.

8. The drill bit according to claim 7, characterized in that, The drill bit also includes an auxiliary groove disposed on the drill rod, the auxiliary groove being parallel to the centerline of the drill rod, and the secondary cutting edge being located between the auxiliary groove and the chip removal groove.

9. The drill bit according to claim 8, characterized in that, The secondary blade comprises two oppositely arranged blades, and the first included angle between the center line connecting the two secondary blades and the main blade is greater than 90 degrees, with the auxiliary groove located within the range of the first included angle.

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