TWM601653U - Structure of drilling head - Google Patents

Abstract

A drill bit structure suitable for an electric screwdriver. The drill bit structure includes a joining section and a drilling section. The coupling section is used to insert into the electric screwdriver. The drilling section has a connecting end, a drill bit end and a plurality of spiral chip guide grooves. The connecting end is connected to the connecting section, the drill bit end is opposite to the connecting end, and the spiral chip guide groove extends spirally from the drill bit end to the connecting end. Wherein, the bit end has a drill point, a first cutting edge, a second cutting edge, a third cutting edge, and a fourth cutting edge. The first cutting edge and the second cutting edge are respectively drilled along a first axis penetrating the drill point. The sharp point extends on two opposite sides, the third knife edge and the fourth knife edge respectively extend along a second axis penetrating the drill point to two opposite sides of the drill point, and the first axis and the second axis form an obtuse angle.

Description

Drill bit structure

The present invention relates to a drill bit structure, especially a four-blade drill bit structure.

A drill bit is a tool with cutting ability through rotation, and is often used to drill holes in cement walls or other materials. Currently, the common drills on the market can be divided into two-edged and four-edged drills according to the number of blades. As the name implies, a two-blade drill has two blades on the head, and the angle between the two blades is 180 degrees to form a linear style. When the two-blade drill bit rotates on the cement wall, the two blades are linear, so there is a chip removal space in the drilling groove, so that the debris generated during drilling can be discharged to the connecting head Spiral chip guide, and then through the spiral chip guide to discharge out of the drilling groove.

In the same way, as the name implies, the four-blade drill has four blades on the head. Compared with the two-blade drill, the four-blade drill has more blades than the two-blade drill, so the cutting ability of the four-blade drill should be better than that of the two-blade drill. Cutting ability. However, because the increase in the number of blades will also compress the cutting space of the drill bit, the four-edge drill is often limited by insufficient chip removal ability, which makes it difficult for the cutting ability to grow multiple times as the number of blades increases.

The present invention provides a drill bit structure, so as to solve the problem that the drill bit in the prior art cannot balance the cutting ability and chip removal ability.

The drill bit structure disclosed in an embodiment of the present invention is suitable for an electric screwdriver. The drill bit structure includes a joining section and a drilling section. The coupling section is used to insert into the electric screwdriver. The drilling section has a connecting end, a drill bit end and a plurality of spiral chip guide grooves. The connecting end is connected to the connecting section, the drill bit end is opposite to the connecting end, and the spiral chip guide groove extends spirally from the drill bit end to the connecting end. Wherein, the bit end has a drill point, a first cutting edge, a second cutting edge, a third cutting edge, and a fourth cutting edge. The first cutting edge and the second cutting edge are respectively drilled along a first axis penetrating the drill point. The sharp point extends on two opposite sides, the third knife edge and the fourth knife edge respectively extend along a second axis penetrating the drill point to two opposite sides of the drill point, and the first axis and the second axis form an obtuse angle.

According to the drill structure disclosed in the above embodiment, because the first cutting edge and the second cutting edge respectively extend along a first axis penetrating the drill point to two opposite sides of the drill point, the third cutting edge and the fourth cutting edge are respectively extending along the penetrating drill A second axis of the sharp point extends to two opposite sides of the drill point, and the first axis and the second axis form an obtuse angle, which makes the angle between the two adjacent cutting edges obtuse, which can increase the row Crumb space. In this way, in addition to the cutting ability of the original four-edged drill, it can also take into account the chip removal ability of the two-edged drill, thereby increasing the cutting speed of the drill structure.

The above description of the content of the present invention and the description of the following embodiments are used to demonstrate and explain the principle of the present invention, and provide a further explanation of the scope of the patent application of the present invention.

Please refer to Figure 1 to Figure 5. Fig. 1 is a three-dimensional schematic diagram of the drill bit structure according to the first embodiment of the present invention. Fig. 1 is a three-dimensional schematic diagram of the drill bit structure according to the first embodiment of the present invention. Figure 2 is a bottom plan view of Figure 1; Figure 3 is a top view of the bit end of Figure 1; Figure 4 is a partial side view of Figure 1; Fig. 5 is a partial side view of Fig. 1 from another perspective.

The drill bit structure 10 of this embodiment is suitable for an electric screwdriver 11. The drill bit structure 10 includes a joining section 100 and a drilling section 200. The coupling section 100 is used to be inserted into the electric screwdriver 11. The drilling section 200 has a connecting end 210, a drill end 220, and two spiral chip guide grooves 230a, 230b. The connecting end 210 is connected to the joining section 100, the bit end 220 is opposite to the connecting end 210, and the spiral chip guide grooves 230 a and 230 b spirally extend from the bit end 220 to the connecting end 210. When the user wants to drill a hole on a concrete wall, first insert the joint section 100 of the drill bit structure 10 into the electric screwdriver 11, and the bit end 220 of the drilling section 200 abuts the concrete wall, and then activates the electric screwdriver 11 to drive the drill bit When the structure 10 rotates, the rotating bit end 220 is drilled into the cement wall to form a drilling groove, and the debris during drilling will be discharged through the rotating spiral chip guide grooves 230a, 230b to prevent debris from accumulating in the drilling groove It affects the smoothness of drilling.

As shown in FIGS. 1 and 2, the coupling section 100 of this embodiment is a cylinder, and the coupling section 100 has an outer wall surface 110, a bottom surface 120, two slots 130 and two grooves 140. The outer wall surface 110 is perpendicular to the bottom surface 120, and the bottom surface 120 is located on the side of the coupling section 100 away from the connecting end 210. The two slots 130 are recessed from opposite sides of the outer wall surface 110, and the two slots 130 face away from the connecting end 210. Extend to the bottom surface 120. The two grooves 140 are respectively recessed and formed from the other two opposite sides of the outer wall 110, the line of the two grooves 140 intersects and is perpendicular to the line of the two slots 130, and the two grooves 140 respectively extend away from the connecting end 210 , And the two grooves 140 keep a distance from the bottom surface 120. The two slots 130 and the two grooves 140 of the coupling section 100 are respectively clamped by the clamping elements of the power-driven screwdriver 11, so that the electric screwdriver 11 can drive the drill bit structure 10 to rotate for drilling.

As shown in FIG. 3, the drill end 220 has an arc-shaped top surface 221, a drill point point 222, a first cutting edge 223, a second cutting edge 224, a third cutting edge 225 and a fourth cutting edge 226. The arc-shaped top surface 221 is located on the side of the bit end 220 away from the connecting end 210. The drill point 222, the first cutting edge 223, the second cutting edge 224, the third cutting edge 225, and the fourth cutting edge 226 respectively protrude from the arc-shaped top surface 221. The drill point 222 is located in the central area of the arc-shaped top surface 221, and the first cutting edge 223 and the second cutting edge 224 are respectively connected to opposite sides of the drill point 222 and extend along a first axis A passing through the drill point 222. The third cutting edge 225 and the fourth cutting edge 226 respectively extend along a second axis B penetrating the drill point 222 to opposite sides of the drill point 222, and the included angle θ1 between the first axis A and the second axis B is an obtuse angle. The shapes of the first blade 223, the second blade 224, the third blade 225, and the fourth blade 226 are, for example, but not limited to, linear shapes. In other embodiments, the first blade, the second blade, the third blade, and the fourth blade may be in the shape of a sickle, respectively. In addition, the first cutting edge 223 has a first inclined surface 2231 and a second inclined surface 2232 facing different directions, the second cutting edge 224 has a first inclined surface 2241 and a second inclined surface 2242 facing different directions, and a third cutting edge 225 It has a first inclined surface 2251 and a second inclined surface 2252 facing different directions, and the fourth blade 226 has a first inclined surface 2261 and a second inclined surface 2262 facing different directions. The first inclined surface 2231 of the first cutting edge 223 is connected to the second inclined surface 2252 of the third cutting edge 225 and located on the same plane, and the second inclined surface 2232 of the first cutting edge 223 is connected to the second inclined surface 2262 of the fourth cutting edge 226 and is located On the same plane. The first inclined surface 2241 of the second blade 224 is connected to the first inclined surface 2251 of the third blade 225 and is located on the same plane, and the second inclined surface 2242 of the second blade 224 is connected to the first inclined surface 2261 of the fourth blade 226 and located on the same plane. On the plane.

The included angle θ1 between the first cutting edge 223 and the third cutting edge 225 is an obtuse angle, and the obtuse angle is greater than 110 degrees. A first chip discharge groove 227 is formed between the first cutting edge 223 and the third cutting edge 225, and the first chip discharge groove 227 communicates with one of the spiral chip guide grooves 230a. The first chip flute 227 has a first flat surface 2271, one end of the first flat surface 2271 is connected to the end of the third cutting edge 225 away from the drill point 222, and the other end of the first flat surface 2271 is connected to the first cutting edge 223.

The angle θ2 between the second knife edge 224 and the fourth knife edge 226 is an obtuse angle, and the obtuse angle is greater than 110 degrees. A second chip flute 228 is formed between the second knife edge 224 and the fourth knife edge 226, and the second chip flute 228 communicates with another spiral chip guide 230b. The second chip flute 228 has a second flat surface 2281, one end of the second flat surface 2281 is connected to an end of the fourth cutting edge 226 away from the drill point 222, and the other end of the second flat surface 2281 is connected to the second cutting edge 224. The first chip flute 227 and the second chip flute 228 are used to discharge the chips of the drill structure 10 during drilling into the spiral chip grooves 230a, 230b, and are formed by the rotating spiral chip grooves 230a, 230b. Drain the debris.

The larger the included angle θ1 between the first cutting edge 223 and the third cutting edge 225, the larger the space of the first chip flute 227, and because the included angle θ2 between the second cutting edge 224 and the fourth cutting edge 226 is the included angle θ1 Therefore, the space of the second chip flute 228 will also increase relatively.

The structure of the drill bit of this embodiment has an obtuse angle between the first cutting edge 223 and the third cutting edge 225, and the arrangement of an obtuse angle between the second cutting edge 224 and the fourth cutting edge 226 makes the first chip flute 227 and the second row The space of the chip flutes 228 is increased, thereby enhancing the chip removal ability of the drill bit structure 10 and increasing the cutting speed of the drill bit.

The material of the joining section 100 and the drilling section 200 of this embodiment is tungsten steel alloy, but it is not limited thereto. In other embodiments, the material of the bonding section and the drilling section may also be a chrome vanadium steel alloy.

The drill structure of the above embodiment only discharges the chips in the hole to the spiral chip guides 230a, 230b through the first chip removal groove 227 and the second chip removal groove 228, but it is not limited to this. Please refer to Figure 6 and Figure 7. Fig. 6 is a perspective view of a part of the drilling section according to the second embodiment of the present invention. Figure 7 is a top view of the bit end of Figure 6;

In addition to the arrangement of the first chip flute 227 and the second chip flute 228 of FIG. 1, the drill bit structure 20 of this embodiment also has other chip removal structures, that is, the drill bit end 320 of this embodiment has a first chip A groove 326 and a second groove 327. The first groove 326 is formed between the first blade 322 and the fourth blade 325, and the two ends of the first groove 326 respectively extend to the arc-shaped top surface 321 and the spiral guide Chip flute 330a. The second groove 327 is formed between the second cutting edge 323 and the third cutting edge 324, and the two ends of the second groove 327 respectively extend to the arc-shaped top surface 321 and the spiral chip guide 330b.

The coupling section in the above embodiment is a cylindrical arrangement, but it is not intended to limit the present invention. Please refer to FIG. 8. FIG. 8 is a perspective view of the drill bit structure according to the third embodiment of the present invention. The drill bit structure 30 of this embodiment changes the joining section 400 to a hexagonal cylinder, and the connecting end 510, the bit end 520, and the spiral chip guides 530a and 530b of the drilling section 500 are arranged as described in the embodiment of FIG. 1, so No longer.

According to the drill structure of the above embodiment, the first and third cutting edges are at an obtuse angle, and the second and fourth cutting edges are arranged at obtuse angles, so that the space between the first and second flutes is increased , Thereby enhancing the chip removal ability of the drill bit structure. As a result, the drill structure not only has the cutting ability of four blades, but also has a good chip removal ability, so that the cutting speed of the drill structure can be improved.

Although the present invention is disclosed in the foregoing preferred embodiments as above, it is not intended to limit the present invention. Anyone who is familiar with similar skills can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of patent protection for new models shall be determined by the scope of patent applications attached to this specification.

10, 20, 30: drill bit structure 11: Electric screwdriver 100, 400: combined segment 110: Outer wall 120: bottom 130: Slot 140: groove 200, 500: drilling section 210, 510: connecting end 220, 320, 520: bit end 221, 321: curved top surface 222: Drill Point 223, 322: First Blade 224, 323: Second Blade 225, 324: Third Blade 226, 325: Fourth Blade 227: First chip flute 2271: The first flat surface 228: Second chip flute 2281: second flat surface 230a, 230b, 330a, 330b, 530a, 530b: spiral chip guide 326: first groove 327: second groove A: The first axis B: second axis θ1, θ2: included angle L1, L2, L3, L4, L5, L6: length 2231, 2241, 2251, 2261: first slope 2232, 2242, 2252, 2262: second slope

Fig. 1 is a three-dimensional schematic diagram of the drill bit structure according to the first embodiment of the present invention. Figure 2 is a bottom plan view of Figure 1; Figure 3 is a top view of the bit end of Figure 1; Figure 4 is a partial side view of Figure 1; Fig. 5 is a partial side view of Fig. 1 from another perspective. Fig. 6 is a perspective view of a part of the drilling section according to the second embodiment of the present invention. Figure 7 is a top view of the bit end of Figure 6; Fig. 8 is a three-dimensional schematic diagram of the drill bit structure according to the third embodiment of the present invention.

10: Drill bit structure

11: Electric screwdriver

100: combined segment

110: Outer wall

130: Slot

140: groove

200: Drilling section

210: connection end

220: bit end

221: curved top surface

222: Drill Point

223: The First Blade

224: Second Blade

225: The Third Blade

226: The Fourth Blade

230a, 230b: Spiral chip guide

Claims (12)

A drill bit structure suitable for an electric screwdriver, including: A joint section for inserting into the electric screwdriver; and a drilling section having a connecting end, a drill bit end and a plurality of spiral chip guide grooves, the connecting end is connected to the joint section, and the drill bit end is relative to the connection End, the spiral chip guiding groove spirally extends from the drill end to the connecting end; wherein the drill end has a drill point, a first cutting edge, a second cutting edge, a third cutting edge, and a fourth cutting edge, The first cutting edge and the second cutting edge respectively extend along a first axis passing through the drill point to two opposite sides of the drill point, and the third cutting edge and the fourth cutting edge respectively extend along a point passing through the drill point. The second axis extends to two opposite sides of the drill point, and the first axis and the second axis form an obtuse angle. The drill bit structure described in item 1 of the scope of patent application, wherein the drilling section has two spiral chip guides, and the angle between the first cutting edge and the third cutting edge is an obtuse angle, and the first cutting edge and the third cutting edge are obtuse. A first chip flute is formed between the cutting edges, the first chip flute is connected to one of the spiral chip guide grooves, the angle between the second cutting edge and the fourth cutting edge is an obtuse angle, and the second cutting edge and the fourth cutting edge are obtuse. A second chip groove is formed between the cutting edges, and the second chip groove communicates with another spiral chip guide groove. According to the drill bit structure described in item 2 of the scope of patent application, the first chip flute has a first flat surface, one end of the first flat surface is connected to the end of the third cutting edge away from the drill point, and the The other end of a flat surface is connected to the first cutting edge, the second chip flute has a second flat surface, one end of the second flat surface is connected to the end of the fourth cutting edge away from the drill point, the first The other end of the flat surface is connected to the second blade. In the drill bit structure described in item 2 of the scope of patent application, the obtuse angle between the first cutting edge and the third cutting edge is greater than 110 degrees, and the obtuse angle between the second cutting edge and the fourth cutting edge is greater than 110 degrees. The drill bit structure described in item 2 of the scope of patent application, wherein the drill bit end further has a first groove and a second groove, and the first groove is formed between the first cutting edge and the fourth cutting edge, And the first groove extends to one of the spiral chip guide grooves, the second groove is formed between the second cutting edge and the third cutting edge, and the second groove extends to the other spiral chip guide groove . According to the drill structure described in item 1 of the scope of patent application, the shapes of the first blade, the second blade, the third blade, and the fourth blade are linear. The drill bit structure described in item 1 of the scope of patent application, wherein the joint section is a cylinder. The drill bit structure described in item 1 of the scope of patent application, wherein the joint section is a hexagonal cylinder. The drill bit structure described in item 1 of the scope of patent application, wherein the coupling section has an outer wall surface, a bottom surface, two slots and two grooves, the outer wall surface is perpendicular to the bottom surface, and the bottom surface is located far away from the coupling section. On one side of the connecting end, the two slots are respectively recessed from two opposite sides of the outer wall surface, and the two slots extend to the bottom surface in a direction away from the connecting end, and the two grooves are respectively from the other two opposite sides of the outer wall surface A recess is formed, the two grooves respectively extend in a direction away from the connecting end, and the two grooves are kept at a distance from the bottom surface. For the drill bit structure described in item 1 of the scope of patent application, the material of the joining section and the drilling section is tungsten steel alloy. For the drill bit structure described in item 1 of the scope of patent application, the material of the joining section and the drilling section is chrome vanadium steel alloy. The drill bit structure described in item 1 of the scope of patent application, wherein the first blade, the second blade, the third blade, and the fourth blade each have a first inclined surface and a second inclined surface facing different directions, The first inclined surface of the first cutting edge is connected to the second inclined surface of the third cutting edge and located on the same plane, and the second inclined surface of the first cutting edge is connected to the second inclined surface of the fourth cutting edge and located on the same plane On a plane, the first inclined surface of the second blade is connected with the first inclined surface of the third blade and is located on the same plane, and the second inclined surface of the second blade is connected with the first inclined surface of the fourth blade And are located on the same plane.

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