Drill bit

Abstract

The utility model provides a drill bit, and belongs to the technical field of hardware tools. The technical problems that an existing drill bit is low in efficiency, poor in heat dissipation effect, short in service life and the like are solved. The drill bit comprises a drill rod and a tool bit, the tool bit is fixedly arranged at one end of the drill rod, the tool bit is provided with at least two cutting edges, all the cutting edges are evenly distributed in the circumferential direction of the tool bit at intervals, and the cutting edges are gathered at the center line of the tool bit to form a tool nose after extending in the direction of the center line of the tool bit in a linear inclination or arc inclination mode; a plurality of grooves are formed in the outer side face of each cutting edge, and the two ends, in the length direction, of each groove penetrate through the two sides of the corresponding cutting edge correspondingly. The cutting efficiency of the drill bit is greatly improved, the heat dissipation effect is good, the cutting edges are not prone to damage, and the service life is long.

Description

Technical Field

[0001] The utility model belongs to the technical field of hardware tools and relates to a drill bit. Background Art

[0002] A drill bit is a common tool for machining or production operations. It can be used to drill holes in workpieces or construction objects. It is used in various electric drills, drilling machines or drilling machines. It has a wide range of uses. At the same time, there are many types of drill bits. Usually, a drill bit includes a tool bar, which has a tip with a cutting edge and a chip groove. When used, the drill bit rotates around the vertical axis and moves axially at the same time. Under the action of the torque and axial force of the drill bit, a hole is cut out of the workpiece or construction object, and the chips are discharged from the chip groove.

[0003] The development of drill bits has gone through a long period of time, and the manufacturing process is relatively mature. In the prior art, drill bits are consumables that are used frequently, are easily worn, and are consumed a lot, resulting in high operating costs. In addition, the work efficiency of drill bits in the prior art also has room for further improvement, so improvements are needed. Utility Model Content

[0004] The utility model provides a drill bit in view of the above problems existing in the prior art. The technical problem to be solved by the utility model is: how to improve the drilling efficiency and service life of the drill bit when it is used.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A drill bit comprises a drill rod and a cutter head, wherein the cutter head is fixedly mounted on one end of the drill rod, and the cutter head has at least two cutting edges, all of which are evenly spaced along the circumference of the cutter head, and the cutting edges are straightly inclined or arc-shaped and extend toward the center line of the cutter head and then converge at the center line of the cutter head to form a cutting tip; a plurality of grooves are formed on the outer side surface of each of the cutting edges, and the two ends of the groove in the length direction respectively pass through the two sides of the cutting edge.

[0007] The principle is as follows: ordinary drill bits in the prior art usually have two or four cutting edges that are arranged opposite to each other. The cutting edges are usually in an arc shape and converge at one point to form a cutting tip. At present, drill bits will generate a lot of heat during chip cutting. If the heat dissipation effect is not good or not timely, the drill bit will heat up, which will affect the rigidity of the drill bit and thus affect its service life; at the same time, unsmooth chip removal will also affect the service life of the drill bit and the efficiency of chip drilling processing.

[0008] The present technical solution optimizes and improves the cutter head structure, and is applicable to a variety of drills with more than two cutting edges. Specifically, each cutting edge is improved, and a transverse groove is provided on the cutting edge, and the groove is preferably slightly inclined to the thickness direction of the cutting edge. When the drill is screwed into the hole, the groove can be used for both heat dissipation and chip removal, thereby improving the efficiency of the drill drilling process in the present application and increasing its service life; in addition, by setting a plurality of grooves and reasonably arranging the spacing between the grooves, the portion between adjacent grooves on the same cutting edge forms a serrated structure, so that during the rotary drilling process of the drill, the cutting resistance is reduced, and the chip removal efficiency is further improved.

[0009] After comparing actual production experimental data, the cutting efficiency has been greatly improved and the cutting edge is not easily damaged.

[0010] In the above-mentioned drill bit, the groove is a V-shaped groove or an arc-shaped groove, which is convenient for processing and also convenient for ventilation, heat dissipation and chip removal of the cutter head.

[0011] In the above drill bit, the length direction of the groove is inclined to the thickness direction of the cutting edge where it is located, and there is an acute angle between the two. During the drilling process, the drill bit performs both rotational motion and linear feed motion. The inclined groove is consistent with the spiral motion of the drill bit, which is convenient for efficient and rapid discharge of debris and is also beneficial for heat dissipation.

[0012] In the above drill bit, the number of the cutting edges is four, and a first chip removal groove is provided on the drill rod between any two adjacent cutting edges, and the first chip removal groove is arranged along the length direction of the drill rod. The four first chip removal grooves are used to speed up chip removal and can also be used for heat dissipation of the cutter head.

[0013] In the drill bit, the grooves on two adjacent cutting edges are staggered in the length direction of the cutting edges. The positions of the grooves on the two opposite cutting edges can be the same, while the positions of the grooves on the two adjacent cutting edges are staggered, which is more reasonable, has a fast drilling speed and a long working life.

[0014] In the above drill bit, the number of the grooves on each cutting edge is at least three, the grooves are arranged obliquely in the length direction, and the multiple grooves on different cutting edges are located on the same spiral line centered on the center line of the cutter head. In this way, when the drill bit is rotated and fed, the debris is discharged more smoothly and efficiently, and the heat dissipation effect is also better.

[0015] In the above drill bit, one end of the drill rod is a mounting section, and the cutter head is fixed on the mounting section; the other end of the drill rod has a clamping section with a polygonal cross section, and a polished rod section is provided between the mounting section and the clamping section, and the outer diameter of the mounting section is larger than the outer diameter of the polished rod section. In this way, the chip removal effect and heat dissipation effect are good.

[0016] In the above drill bit, the mounting section, the polished rod section and the clamping section are integrally formed, the end of the mounting section close to the tool tip has an arc surface, one end of the first chip removal groove extends through the arc surface, and the other end of the first chip removal groove extends through the end surface of the mounting section facing the polished rod section. In this way, the debris generated during the drilling process can be quickly discharged and will not accumulate and clog the first chip removal groove.

[0017] In the above drill bit, the drill rod and the cutter head are coaxially arranged, the cutter head is a cross cutter head, a cross groove is provided on the mounting section, one end of the cutter head forms the cutter tip, the other end is embedded in the cross groove, and the mounting section is welded and fixedly connected to the cutter head; the outer side surface of the cutting edge protrudes from the outer peripheral surface of the mounting section. The cutter head is made of alloy material with better hardness, and the drill rod can be made of cheaper stainless steel material, which is not only easy to process and assemble, but also can ensure the stability of the cutter head assembly connection, reducing the manufacturing cost of the drill bit.

[0018] In the above drill bit, the angle α between the outer side surface of each cutting edge and the thickness direction of the cutting edge is 15° to 30°. Further, α is preferably 20°. The two sides of the outer side surface of the cutting edge form a cutting edge; thus, through further improvement, the angle data is optimized, so that the cutting efficiency is further improved.

[0019] In the above-mentioned drill bit, as another solution, a spiral second chip removal groove is provided on the outer peripheral surface of the drill rod, and the second chip removal groove extends from one end of the drill rod where the cutter head is fixed to the middle of the drill rod. The second chip removal groove is a single-row groove or a double-row groove. This can increase the chip removal speed.

[0020] In the above drill bit, the diameter of the polished rod section is 4mm-5mm, and the outer diameter of the clamping section is 6mm-6.5mm; the clamping section also has two spaced-apart concave necks, the necks are concave arc surfaces, and a hexagonal bolt head is formed between the two necks. Furthermore, the cross section of the clamping section is a regular hexagon, the diameter of the polished rod section is preferably 4.5mm, and the outer diameters of the clamping section and the mounting section are preferably 6.35mm.

[0021] Compared with the prior art, the drill bit in the utility model has at least the following advantages:

[0022] 1. In the present application, each cutting edge is improved, and a transverse groove is provided on the cutting edge. The groove is preferably slightly inclined to the thickness direction of the cutting edge. When the drill bit is screwed into the hole, the groove can be used to dissipate heat, thereby avoiding heat accumulation on the metal cutter head, thereby reducing the rigidity of the cutter head due to high temperature. The groove can effectively dissipate heat and greatly increase the service life of the drill bit.

[0023] 2. The grooves on the cutting edge of the present application can be used for chip removal during the process of the drill bit being screwed into the hole, thereby avoiding the accumulation of drilling debris and improving the operating efficiency of the drill bit drilling process.

[0024] 3. In the present application, a number of grooves are provided on each cutting edge, so that the cutting edge forms a serrated structure, thereby reducing the cutting resistance during the rotary drilling process of the drill bit and further improving the chip cutting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the drill bit in Example 1.

[0026] Figure 2 It is a schematic cross-sectional view of the cutter head and the mounting section of the drill bit.

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the drill bit in Example 2.

[0028] In the figure,

[0029] 10. Drill rod; 11. Mounting section; 111. First chip removal groove; 112. Arc surface; 12. Polished rod section; 13. Clamping section; 14. Second chip removal groove;

[0030] 20. Cutting head; 21. Cutting edge; 211. Groove; 22. Cutting tip. DETAILED DESCRIPTION

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Example 1

[0032] Common drill bits in the prior art usually have two or four cutting edges 21 arranged opposite to each other, and the cutting edges 21 are in an arc shape and converge directly to a point to form a tool tip 22. In the prior art, a drill bit will generate a lot of heat during chip cutting. If the heat dissipation effect is not good or timely, the drill bit will heat up, which will affect the rigidity of the drill bit and thus its service life; at the same time, unsmooth chip removal will also affect the service life of the drill bit and the efficiency of chip cutting and drilling. In this embodiment, the drill bit structure is optimized and improved, and is suitable for a variety of drill bits with more than two cutting edges 21.

[0033] like Figure 1 and Figure 3As shown, the drill bit in this embodiment includes a drill rod 10 and a cutter head 20, the cutter head 20 is fixedly mounted at one end of the drill rod 10, the cutter head 20 has at least two cutting edges 21, the number of the cutting edges 21 in this embodiment is preferably four, all the cutting edges 21 are evenly spaced along the circumference of the cutter head 20, the cutting edges 21 are straightly inclined or arc-shapedly extended toward the center line of the cutter head 20 and then converge at the center line of the cutter head 20 to form a cutting tip 22; a plurality of grooves 211 are provided on the outer surface of each cutting edge 21, the grooves 211 are V-shaped grooves or arc-shaped grooves; the two ends of the groove 211 in the length direction respectively pass through the two sides of the cutting edge 21.

[0034] Specifically, the drill rod 10 and the cutter head 20 are coaxially arranged, and the cutter head 20 is a cross cutter head; one end of the drill rod 10 is a mounting section 11, and a cross groove is provided on the mounting section 11, and a cutting tip 22 is formed at one end of the cutter head 20, and the other end is embedded in the cross groove and the mounting section 11 is welded and fixedly connected with the cutter head 20; the other end of the drill rod 10 has a clamping section 13 with a polygonal cross section, and a polished rod section 12 is provided between the mounting section 11 and the clamping section 13, and the outer diameter of the mounting section 11 is greater than the outer diameter of the polished rod section 12; the mounting section 11, the polished rod section 12 and the clamping section 13 are integrally formed, and the end of the mounting section 11 close to the cutting tip 22 has an arc surface 112; the outer side surface of the cutting edge 21 protrudes from the outer peripheral surface of the mounting section 11, and the angle α between the outer side surface of each cutting edge 21 and the thickness direction of the cutting edge 21 is 15° to 30°; α is preferably 20°, and the two sides of the outer side surface of the cutting edge 21 form a cutting edge, and the cutting efficiency is improved by optimizing the angle data. The cutter head 20 is made of an alloy material with better hardness, and the drill rod 10 can be made of a cheaper stainless steel material, which is convenient for processing and assembly, and can ensure the stability of the assembly connection of the cutter head 20, thereby reducing the manufacturing cost of the drill bit.

[0035] Furthermore, in the present application, the number of grooves 211 on each cutting edge 21 is at least three, the length direction of the groove 211 is inclined to the thickness direction of the cutting edge 21 on which it is located and there is an acute angle between the two, and the grooves 211 on two adjacent cutting edges 21 are staggered in the length direction of the cutting edge 21, and the positions of the grooves 211 on the two opposite cutting edges 21 can be the same or staggered; as the best choice, in the present application, the length direction of the grooves 211 is inclined and the multiple grooves 211 on different cutting edges 21 are located on the same spiral line centered on the center line of the cutter head 20. During the drilling process, the drill bit performs both rotational motion and linear feed motion, and the inclined grooves 211 are consistent with the spiral motion of the drill bit, which is convenient for efficient and rapid discharge of debris and is also beneficial for heat dissipation.

[0036] Reference Figure 1As shown, a first chip removal groove 111 is provided on the drill rod 10 between any two adjacent cutting edges 21, and the first chip removal groove 111 is arranged along the length direction of the drill rod 10; one end of the first chip removal groove 111 extends through the arc surface 112, and the other end of the first chip removal groove 111 extends through the end surface of the mounting section 11 facing the polished rod section 12. The four first chip removal grooves 111 are used to speed up chip removal and can also be used for heat dissipation of the cutter head 20.

[0037] In the present application, the diameter of the polished rod section 12 is 4mm to 5mm, and the outer diameter of the clamping section 13 is 6mm to 6.5mm; the clamping section 13 also has two spaced-apart constricted necks, which are concave arc surfaces 112, and a hexagonal bolt head is formed between the two constricted necks. Furthermore, the cross section of the clamping section 13 is a regular hexagon, the diameter of the polished rod section 12 is preferably 4.5mm, and the outer diameters of the clamping section 13 and the mounting section 11 are preferably 6.35mm.

[0038] The implementation principle is as follows: the structure of the cutter head 20 is optimized and improved in the present application, and a groove 211 is provided on each cutting edge 21, and the groove 211 is slightly inclined to the thickness direction of the cutting edge 21. When the drill is screwed into the hole, the groove 211 can be used for both heat dissipation and chip removal, thereby improving the efficiency of the drill drilling process in the present application and increasing its service life; in addition, by setting a plurality of grooves 211 and reasonably arranging the spacing between the grooves 211, the portion between adjacent grooves 211 on the same cutting edge 21 forms a serrated structure, thereby reducing the cutting resistance during the rotary drilling process of the drill and further improving the chip cutting efficiency.

[0039] After comparing the actual production experimental data, the cutting efficiency has been greatly improved, and the cutting edge 21 is not easily damaged. For example, when drilling holes for medium-thick tiles in the decoration field, traditional drill bits need to be water-cooled to operate, and they will be damaged after less than 20 consecutive operations; while the drill bit in this application can achieve dry drilling, that is, it can be operated continuously for more than 7 times without the use of water cooling. If water cooling is used, it can be used for more than 30 times, which greatly improves the service life and has higher operating efficiency. Example 2

[0040] Reference Figure 3 As shown, this embodiment is substantially the same as Embodiment 1, except that a spiral second chip groove 14 is provided on the outer circumferential surface of the drill rod 10 in this embodiment, and the second chip groove 14 extends from one end of the drill rod 10 where the cutter head 20 is fixed to the middle of the drill rod 10, and the second chip groove 14 is a single-row groove or a double-row groove, which can increase the chip removal speed.

[0041] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A drill bit, comprising a drill rod (10) and a cutter head (20), wherein the cutter head (20) is fixedly mounted on one end of the drill rod (10), wherein the cutter head (20) has at least two cutting edges (21), wherein all the cutting edges (21) are evenly spaced and distributed along the circumference of the cutter head (20), wherein the cutting edges (21) are straightly inclined or arcuately extended toward the center line of the cutter head (20) and then converge at the center line of the cutter head (20) to form a cutting tip (22); wherein: A plurality of grooves (211) are provided on the outer side surface of each cutting edge (21), and two ends of the grooves (211) in the length direction respectively penetrate two sides of the cutting edge (21).

2. The drill bit according to claim 1, characterized in that The groove (211) is a V-shaped groove or an arc-shaped groove.

3. The drill bit according to claim 1 or 2, characterized in that: The length direction of the groove (211) is inclined to the thickness direction of the cutting edge (21) where the groove (211) is located, and an acute angle is formed between the two.

4. The drill bit according to claim 1 or 2, characterized in that: The number of the cutting edges (21) is four, and a first chip removal groove (111) is provided on the drill rod (10) between any two adjacent cutting edges (21), wherein the first chip removal groove (111) is arranged along the length direction of the drill rod (10).

5. The drill bit according to claim 1 or 2, characterized in that: The grooves (211) on two adjacent cutting edges (21) are staggered in the length direction of the cutting edges (21).

6. The drill bit according to claim 3, characterized in that The number of the grooves (211) on each cutting edge (21) is at least three, the grooves (211) are arranged in a straight line or arc-shaped inclined direction in the length direction, and the plurality of grooves (211) on different cutting edges (21) are located on the same spiral line centered on the center line of the cutter head (20).

7. The drill bit according to claim 4, characterized in that One end of the drill rod (10) is a mounting section (11), and the cutter head (20) is fixedly mounted on the mounting section (11); the other end of the drill rod (10) is provided with a clamping section (13) with a polygonal cross section, and a polished rod section (12) is provided between the mounting section (11) and the clamping section (13); the outer diameter of the mounting section (11) is greater than the outer diameter of the polished rod section (12).

8. The drill bit according to claim 7, characterized in that The mounting section (11), the polished rod section (12) and the clamping section (13) are integrally formed; the end of the mounting section (11) close to the tool tip (22) has an arcuate surface (112); one end of the first chip removal groove (111) extends through the arcuate surface (112); and the other end of the first chip removal groove (111) extends through the end surface of the mounting section (11) facing the polished rod section (12).

9. The drill bit according to claim 7, characterized in that The drill rod (10) and the cutter head (20) are coaxially arranged; the cutter head (20) is a cross cutter head; a cross groove is provided on the mounting section (11); one end of the cutter head (20) forms the cutter tip (22); the other end is embedded in the cross groove; and the mounting section (11) and the cutter head (20) are welded and fixedly connected; the outer side surface of the cutting edge (21) protrudes from the outer peripheral surface of the mounting section (11); and the angle α between the outer side surface of each cutting edge (21) and the thickness direction of the cutting edge (21) is an acute angle.

10. The drill bit according to claim 1, characterized in that A spiral second chip removal groove (14) is provided on the outer circumferential surface of the drill rod (10); the second chip removal groove (14) extends from one end of the drill rod (10) on which a cutter head (20) is fixed to the middle of the drill rod (10); the second chip removal groove (14) is a single-row groove or a double-row groove.

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