Drill bit

Abstract

The utility model belongs to the technical field of drill bits, and particularly relates to a drill bit which comprises a drill handle and a drill body, the drill body comprises a connecting part, a working part and drill teeth, one end of the connecting part is connected with the drill handle, the working part is connected with one end, far away from the drill handle, of the connecting part, a plurality of drill teeth are arranged, and the bottom sides of the drill teeth are connected with the working part. The ends, close to the drill handle, of the multiple drill teeth are arranged on the periphery of the working part at intervals, the ends, away from the drill handle, of the multiple drill teeth are connected, cutting edges are arranged at the tops of the drill teeth, a chip groove is formed in the interval between every two adjacent drill teeth, and a chip breaker groove with an opening in the direction away from the working part is formed in the top of the cutting edge of at least one drill tooth. The chip breaker groove is used for cutting off chips in the chip discharging groove when the drill bit rotates to drill holes. The chip breaker groove can cut off long-strip-shaped cuttings, the situation that the cuttings in the chip discharging groove are long is avoided, the cuttings can be conveniently discharged from the chip discharging groove, then the situation that drilling is affected by the cuttings is avoided, and the drilling precision is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of drill bits, in particular to a drill bit. Background Art

[0002] A drill bit is a tool used for drilling holes and is widely used in construction, machining, auto repair, and home maintenance.

[0003] An existing drill bit includes a drill shank and a drill body. The drill body is connected to the drill shank, and the drill shank is used to connect to a machine tool or a drilling rig. The drill body is provided with a plurality of drill teeth, each drill tooth being arranged at intervals on the outer periphery of the drill body. Each drill tooth extends from an end close to the drill shank to an end away from the drill shank. The interval between any two adjacent drill teeth forms a chip groove. When the drill bit is drilling, the chips generated by the workpiece cutting when the drill teeth rotate will be discharged from the drill hole through the chip groove.

[0004] However, the existing drill bit is prone to generate long strips of chips during drilling operations. If these chips cannot be discharged in time, they will be entangled around the outer periphery of the drill body, scratching the inner wall surface of the drill hole and affecting the finish of the drill hole. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide a drill bit to solve the problem that the existing drill bit is prone to generate long strip-shaped chips during drilling operation, which will scratch the inner wall surface of the drill hole and affect the smoothness of the drill hole.

[0006] To solve the above technical problems, an embodiment of the present invention provides a drill bit, comprising a drill shank and a drill body, wherein the drill body comprises a connecting portion, a working portion, and drill teeth, wherein one end of the connecting portion is connected to the drill shank, and the working portion is connected to an end of the connecting portion away from the drill shank, wherein a plurality of drill teeth are provided, the bottom side of the drill teeth is connected to the working portion, a plurality of the drill teeth are spaced apart and arranged on the outer periphery of the working portion near an end of the drill shank, and a plurality of the drill teeth are connected to an end away from the drill shank, a cutting edge is provided on the top of the drill teeth, and a chip removal groove is formed between two adjacent drill teeth;

[0007] A chip breaker groove is provided on the top of the cutting edge of at least one drill tooth and is opened in a direction away from the working portion. The chip breaker groove is used to shear chips in the chip removal groove when the drill bit rotates to drill a hole.

[0008] Optionally, the chip breaker groove is provided on the top of the cutting edge of each drill tooth.

[0009] Optionally, a plurality of chip breaker grooves are provided on the same drill tooth, and the plurality of chip breaker grooves are arranged at intervals along the extension direction of the drill tooth.

[0010] Optionally, the drill tooth includes a first working section and a second working section, the second working section is connected to the first working section at one end away from the drill shank, the first working sections of each drill tooth are connected, and the chip breaker groove is arranged on the cutting edge of the first working section.

[0011] Optionally, along the axial direction of the drill shank, the chip breaking grooves on any two adjacent drill teeth are arranged opposite each other.

[0012] Optionally, along the axial direction of the drill shank, the chip breaking grooves on any two adjacent drill teeth are staggered.

[0013] Optionally, on the same drill tooth, the spacing between any two adjacent chip breaking grooves is 0.63±0.5 mm.

[0014] Optionally, the chip breaker groove has a wall that is an arc surface.

[0015] Optionally, the chip breaker groove has a depth of 0.25±0.05 mm.

[0016] Optionally, the chip breaker groove has a width of 0.5±0.1 mm.

[0017] According to the drill bit of the embodiment of the present invention, when the drill bit rotates, the drill teeth will drill the workpiece, and the long chips generated by drilling will gather between the chip groove and the workpiece. Compared with the existing technology, when the chip breaker groove rotates with the drill teeth, the chip breaker groove will generate a shear force on the chips in the chip groove, thereby cutting off the long chips, avoiding the chips in the chip groove from being too long, facilitating the discharge of chips from the chip groove, and thus avoiding the chips from affecting the drilling and improving the drilling accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a drill bit provided in one embodiment of the present utility model;

[0019] Figure 2 for Figure 1 Another perspective;

[0020] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0021] Figure 4 for Figure 3 Enlarged view of point B in the middle.

[0022] The accompanying drawings in the specification are as follows: 1. drill shank; 2. drill body; 3. connecting part; 4. working part; 5. drill tooth; 6. first working section; 7. second working section; 8. cutting edge; 9. chip breaker; 10. chip removal groove. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] like Figures 1 to 4 As shown, an embodiment of the present invention provides a drill bit, comprising a drill shank 1 and a drill body 2, the drill body 2 comprising a connecting portion 3, a working portion 4 and a drill tooth 5, one end of the connecting portion 3 is connected to the drill shank 1, the working portion 4 is connected to the end of the connecting portion 3 away from the drill shank 1, a plurality of the drill teeth 5 are provided, the bottom side of the drill tooth 5 is connected to the working portion 4, a plurality of the drill teeth 5 are arranged at intervals on the outer periphery of the working portion 4 near one end of the drill shank 1, a plurality of the drill teeth 5 are connected to the end away from the drill shank 1, a cutting edge 8 is provided on the top of the drill tooth 5, a chip groove 10 is formed between two adjacent drill teeth 5, and a chip breaker groove 9 is provided on the top of the cutting edge 8 of at least one drill tooth 5, which is open in a direction away from the working portion 4, and the chip breaker groove 9 is used to shear chips in the chip groove 10 when the drill bit rotates to drill.

[0025] Specifically, the chip breaker groove 9 is arranged on the cutting edge 8 at the end of the drill tooth 5 away from the working part 4, and the opening of the chip breaker groove 9 is facing away from the working part 4. When the drill bit is drilling, the opening of the chip breaker groove 9 is facing the wall of the drill hole of the workpiece, and the long chips generated by drilling will gather between the chip groove 10 and the workpiece. When the chip breaker groove 9 rotates with the drill tooth 5, the groove wall of the chip breaker groove 9 and the edge of the chip breaker groove 9 will generate shear force on the chips in the chip groove 10, thereby cutting off the long chips, making it easier for the chips to be discharged from the chip groove 10, thereby avoiding the chips from affecting the drilling and improving the drilling accuracy.

[0026] In one embodiment, the drill teeth 5 are arranged in a spiral shape around the outer circumference of the working portion 4, and the chip breaker groove 9 is provided at the top of the cutting edge 8 of each drill tooth 5. The drill teeth 5 are spirally wound around the outer circumference of the working portion 4. The spiral shape of the drill teeth 5 can increase the length of the cutting edge 8 of the drill teeth 5, thereby increasing the cutting area of ​​the workpiece during one rotation of the drill bit, thereby improving work efficiency.

[0027] In one embodiment, the drill tooth 5 includes a first working section 6 and a second working section 7, the second working section 7 is connected to the first working section 6 at one end away from the drill shank 1, the first working section 6 of each drill tooth 5 is connected, and the chip breaker groove 9 is arranged on the cutting edge 8 of the first working section 6.

[0028] Specifically, the drill bit 5 comprises a first working section 6 and a second working section 7, the second working section 7 is connected with the drill shank 1, one end of the second working section 7 away from the drill shank 1 is connected with the first working section 6, the end of each drill bit 5 away from the second working section 7 is gathered together to form a drill tip of the drill bit, and the first working section 6 is located at the front side of the second working section 7 from the axial direction of the drill bit.

[0029] When the drilling operation is performed, the first working section 6 and the drill tip first contact the workpiece, the chip breaking groove 9 is arranged on the first working section 6, the chip breaking groove 9 can cut the chip between the first working section 6 and the workpiece, and the chip is discharged from the chip discharge groove 10, when the second working section 7 contacts the workpiece, the cutting edge 8 on the second working section 7 further cuts the hole wall of the drilled hole, the drilled hole is finished, and the drilling precision is improved.

[0030] In an embodiment, the chip breaking grooves 9 on any two adjacent drill bits 5 are staggered along the axial direction of the drill shank 1.

[0031] Specifically, the chip breaking grooves 9 on any two adjacent drill bits 5 are staggered along the axial direction of the drill shank 1, which means that when the drill bit is erected, the chip breaking grooves 9 on the adjacent two drill bits 5 are located at different heights, the shear force can be applied to different positions of the chip during one rotation of the drill bit, the chip can be cut shorter, and the shearing effect of the chip breaking groove 9 is improved.

[0032] In an embodiment, a plurality of chip breaking grooves 9 are arranged on the same drill bit 5, and the plurality of chip breaking grooves 9 are arranged at intervals along the extension direction of the drill bit 5.

[0033] Specifically, a plurality of chip breaking grooves 9 are arranged on the same drill bit 5, and the plurality of chip breaking grooves 9 are arranged at intervals along the length direction of the drill bit 5 on the cutting edge 8, the chip can be cut at different positions along the length direction of the chip during one rotation of the drill bit, the shearing efficiency of the chip breaking groove 9 is further improved, the chip can be cut shorter, and the chip is more easily discharged from the chip discharge groove 10.

[0034] In an embodiment, the distance between any two adjacent chip breaking grooves 9 on the same drill bit 5 is 0.63±0.5mm.

[0035] Specifically, the distance between any two adjacent chip breaking grooves 9 on the same drill bit 5 is 0.63±0.5mm, which means that the vertical distance between the front side groove of one chip breaking groove 9 located at the front side of the working part 4 and the front side groove of the other chip breaking groove 9 is a, and a=0.63±0.5mm. The shearing effect of the chip breaking groove 9 can be ensured.

[0036] In an embodiment, the groove wall of the chip breaking groove 9 is a circular arc surface, and the groove depth of the chip breaking groove 9 is 0.25±0.05mm.

[0037] Specifically, the groove wall of the chip breaker groove 9 is an arc surface, which can accommodate chips with a larger area, thereby exerting a greater shear force on the chips, facilitating chip shearing and improving shearing efficiency. The groove depth of the chip breaker groove 9 is 0.25±0.05mm, which means that the vertical distance between the groove edge where the chip breaker groove 9 meets the cutting edge 8 and the arc bottom of the chip breaker groove 9 is b, and b=0.25±0.05mm.

[0038] In one embodiment, the chip breaker groove 9 has a groove width of 0.5±0.1 mm. Specifically, the groove width of the chip breaker groove 9 is 0.5±0.1 mm, which means that the vertical distance between the groove edges on both sides of the chip breaker groove 9 and the cutting edge 8 is c, c=0.5±0.1 mm.

[0039] The working principle of the drill bit of the embodiment of the utility model is as follows:

[0040] When the drill bit is drilling, the opening of the chip breaker groove 9 faces the wall of the drill hole in the workpiece, and the long chips generated by drilling will gather between the chip groove 10 and the workpiece. When the chip breaker groove 9 rotates with the drill tooth 5, the groove wall and edge of the chip breaker groove 9 will generate shear force on the chips in the chip groove 10, thereby cutting off the long chips and facilitating the discharge of the chips from the chip groove 10, thereby avoiding the chips from affecting the drilling and improving the drilling accuracy.

[0041] According to the drill bit of the embodiment of the present invention, when the drill bit rotates, the drill teeth 5 will drill the workpiece, and the long chips generated by drilling will gather between the chip groove 10 and the workpiece. Compared with the prior art, when the chip breaker groove 9 rotates with the drill teeth 5, the chip breaker groove 9 will generate a shear force on the chips in the chip groove 10, thereby cutting off the long chips, avoiding the chips in the chip groove 10 from being too long, facilitating the discharge of chips from the chip groove 10, and thus avoiding the chips from affecting the drilling and improving the drilling accuracy.

[0042] In other embodiments, the chip breaker grooves 9 on any two adjacent drill teeth 5 are arranged opposite each other along the axial direction of the drill shank 1, which means that when the drill bit is erected, the chip breaker grooves 9 on all the drill teeth 5 are at the same height, and the same position of the chips can be cut multiple times during one rotation of the drill bit, so as to improve the shearing efficiency of the chip breaker grooves 9.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A drill bit, characterized in that: The drill body (2) comprises a drill shank (1) and a drill body (2), wherein the drill body (2) comprises a connecting portion (3), a working portion (4) and a drill tooth (5), wherein one end of the connecting portion (3) is connected to the drill shank (1), and the working portion (4) is connected to an end of the connecting portion (3) away from the drill shank (1). A plurality of drill teeth (5) are provided, and the bottom side of the drill tooth (5) is connected to the working portion (4). The plurality of drill teeth (5) are spaced apart and arranged on the periphery of the working portion (4) near an end of the drill shank (1). The plurality of drill teeth (5) are connected to an end away from the drill shank (1). A cutting edge (8) is provided on the top of the drill tooth (5), and a chip removal groove (10) is formed at a gap between two adjacent drill teeth (5). A chip breaker groove (9) opening in a direction away from the working portion (4) is provided on the top of the cutting edge (8) of at least one of the drill teeth (5); the chip breaker groove (9) is used to shear off chips in the chip removal groove (10) when the drill bit is rotated to drill a hole.

2. The drill bit according to claim 1, characterized in that The chip breaker groove (9) is provided on the top of the cutting edge (8) of each drill tooth (5).

3. The drill bit according to claim 1, characterized in that A plurality of chip breaker grooves (9) are provided on the same drill tooth (5), and the plurality of chip breaker grooves (9) are arranged at intervals along the extension direction of the drill tooth (5).

4. The drill bit according to claim 3, characterized in that The drill tooth (5) comprises a first working section (6) and a second working section (7), wherein the end of the second working section (7) away from the drill shank (1) is connected to the first working section (6), and the first working section (6) of each drill tooth (5) is connected, and the chip breaker groove (9) is provided on the cutting edge (8) of the first working section (6).

5. The drill bit according to claim 3, characterized in that Along the axial direction of the drill shank (1), the chip breaking grooves (9) on any two adjacent drill teeth (5) are arranged opposite each other.

6. The drill bit according to claim 3, characterized in that Along the axial direction of the drill shank (1), the chip breaking grooves (9) on any two adjacent drill teeth (5) are arranged in a staggered manner.

7. The drill bit according to claim 6, characterized in that On the same drill tooth (5), the distance between any two adjacent chip breaker grooves (9) is 0.63±0.5 mm.

8. The drill bit according to any one of claims 1 to 7, characterized in that The groove wall of the chip breaker groove (9) is an arc surface.

9. The drill bit according to claim 8, characterized in that The chip breaker groove (9) has a groove depth of 0.25±0.05 mm.

10. The drill bit according to claim 9, characterized in that The chip breaker groove (9) has a groove width of 0.5±0.1 mm.

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