Drill bit

Abstract

The drill bit comprises a rod part and a tool bit arranged at the top end of the rod part, convex ribs are spirally arranged outside the rod part, spiral grooves are formed between the adjacent convex ribs on the rod part, the tool bit comprises a guide face, and the tail ends of the spiral grooves stop at the lower side of the guide face. A first blade head and second blade heads symmetrically arranged at the two ends of the guide face are arranged on the guide face, and chip removal grooves communicating the spiral groove with the guide face are formed between the second blade heads located on the left side and the right side of the first blade head and the first blade head. The drill bit has the beneficial effects that the chip removal groove is formed, so that the tool bit can guide chips gathered on the guide surface into the spiral groove in time when working and discharge the chips out of a machining position from the spiral groove along with the rotation of the drill bit, and therefore, the machining efficiency is effectively improved, and the chips are prevented from being accumulated at the tool bit to abrade the tool bit.

Description

Technical Field

[0001] The utility model relates to a processing tool, in particular to a drill bit. Background Art

[0002] The drill bit is made of carbide material and is highly favored in the field of industrial processing for its excellent hardness and wear resistance. This type of drill is particularly suitable for drilling hard materials such as alloy steel, stainless steel, etc., and can maintain performance without being affected by heat during high-speed drilling. The application of surface coating technology such as titanium nitride or titanium aluminum nitride further improves its durability and cutting efficiency. There are many types of carbide drill bits, including straight shank and tapered shank designs, which are suitable for different machining needs. Although the cost is relatively high, its long service life and high efficiency help reduce long-term production costs. It is an important tool for improving production efficiency in industries such as machining, aerospace, etc.

[0003] Chinese patent document CN218836183U discloses an alloy drill bit, comprising a main body and a head, wherein a double spiral groove structure is arranged on the outer circumferential surface of the main body, and the double spiral groove structure comprises two spiral grooves circumferentially wound on the outer circumferential surface of the main body, and the two spiral grooves are separated by a spiral convex rib spirally arranged along the outer circumferential surface of the main body, and the two sides of the spiral convex rib respectively constitute the inner side walls of the two spiral grooves, the main body is made of chromium alloy material, and the head is arranged at the front end of the main body, and the head includes a flat cutter head base, and the two sides of the cutter head base along the thickness direction are respectively connected to the upper ends of the two spiral grooves, and a flat cutter head made of tungsten steel is fixed on the cutter head base, and the two sides of the cutter head along the thickness direction are arranged corresponding to the two sides of the cutter head base.

[0004] The above scheme has a high structural strength. However, the above scheme has the following disadvantages: when the drill bit in the prior art is used, the cutter head of the workpiece to be processed has no connecting channel between the cutter head and the spiral groove, so the chips of the workpiece to be processed will be blocked at the cutter head, resulting in low drilling efficiency, and the chips blocked at the cutter head will easily increase the wear of the cutter head. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a drill bit which prevents debris from accumulating at the cutter head.

[0006] To achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a drill bit, including a rod and a cutter head arranged at the top end of the rod, the outer spiral of the rod is provided with ribs, and spiral grooves are formed between adjacent ribs on the rod, the cutter head includes a guide surface, the end of the spiral groove ends at the lower side of the guide surface, and the guide surface is provided with a first cutting head and a second cutting head symmetrically arranged at both ends of the guide surface, and a chip removal groove connecting the spiral groove and the guide surface is provided between the second cutting head located on the left and right sides of the first cutting head and the first cutting head.

[0007] The beneficial effects of the utility model are as follows: by arranging the chip withdrawal groove, the cutter head can timely guide the chips accumulated on the guide surface into the spiral groove when working, and discharge them from the spiral groove to the outside of the processing position as the drill bit rotates, thereby effectively improving the processing efficiency and preventing the chips from accumulating on the cutter head and wearing the cutter head; secondly, the end of the spiral groove stops at the lower side of the guide surface, which can ensure that the chips can flow into the spiral groove and will not flow to the side of the cutter head and wear the side of the cutter head; furthermore, the second cutting edges are symmetrically distributed at both ends of the guide surface, which can form a larger cutting surface when the drill bit rotates, further improving the processing efficiency.

[0008] Furthermore, the guide surface is an arc-shaped surface and the highest point of the arc-shaped surface is located at the center of the guide surface, and a protrusion extending toward the center of the guide surface is formed on the cross section of the chip removal groove.

[0009] The guiding surface is an arc-shaped surface and the highest point of the arc-shaped surface is located at the center of the guiding surface, that is, the height of the guiding surface gradually decreases from its center toward its edge. The protrusion extending toward the center of the guiding surface in conjunction with the chip removal groove cross-section makes it easier to discharge the chips on the guiding surface into the spiral groove, further preventing the chips from accumulating on the guiding surface.

[0010] Furthermore, the chip withdrawal groove partially extends into the spiral groove, and the portion of the chip withdrawal groove extending into the spiral groove makes the surface of the spiral groove located at the lower side of the guide surface no longer be arc-shaped.

[0011] The chip groove part extends into the spiral groove, that is, it is cut into the spiral groove located at the lower side of the guide surface according to the outer shape of the chip groove, thereby expanding the channel for the chips to flow from the guide surface to the spiral groove, which is more conducive to the discharge of the chips.

[0012] Furthermore, the second cutting edges are respectively located at the two side ends of the guide surface, the first cutting edges are obliquely distributed on the guide surface and the height of the first cutting edge is higher than the height of the second cutting edge, and the two ends of the cross section of the chip removal groove are respectively connected to the first cutting edge and the second cutting edge.

[0013] The second cutting edge is distributed on the outermost end of the guiding surface, and the height of the first cutting edge is higher than that of the second cutting edge, which is more conducive to guiding the chips at the first cutting edge to the guiding surface between the first cutting edge and the second cutting edge when rotating; since the chip groove is arranged on the guiding surface, the first cutting edge is inclined to divide the surface of the guiding surface, which can more effectively utilize the surface and the rod of the guiding surface, so that the first cutting edge can be more stably fixed on the drill bit; secondly, the two ends of the cross section of the chip groove are respectively connected to the first cutting edge and the second cutting edge, which can further expand the cross-sectional area of ​​the chip groove without affecting the connection strength of the first cutting edge and the second cutting edge, thereby enhancing the effect of the chip groove in draining chips.

[0014] Furthermore, the first cutting head includes a first cutting portion and a second cutting portion, both of which are inclined and intersect to form a cutting tip of the first cutting head; the second cutting head includes a third cutting portion and a fourth cutting portion, both of which are inclined and intersect to form a cutting tip of the second cutting head.

[0015] The first blade and the second blade are arranged from the two side edges of the first blade head toward the center of the first blade head in a gradually increasing height direction, and the two intersect at the center of the first blade head and form the tip of the first blade head there; similarly, the third blade and the fourth blade also form the tip of the second blade head at the center of the second blade head. The tip of the first blade head and the tip of the second blade head can form a convex portion when the drill bit rotates, so that the drill bit can enter the workpiece to be processed more easily, thereby improving the processing efficiency.

[0016] Furthermore, the blade tip of the first blade head is inclined from the edge of the first blade head toward the center of the first blade head and a first tip is formed at the center of the first blade head; the blade tip of the second blade head is inclined from the edge of the second blade head toward the center of the second blade head and a second tip is formed at the center of the second blade head.

[0017] The above-mentioned first tip and second tip may preferably be conical convex portions, and the top ends of the first tip and the second tip are arc-shaped. Therefore, after entering the interior of the workpiece to be processed, the processing efficiency can be improved, and the arc-shaped top ends can reduce the wear of the first tip and the second tip, thereby increasing the service life of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an axonometric diagram of an embodiment of the utility model;

[0019] Figure 2 It is a partial enlarged view of the cutter head of the embodiment of the utility model;

[0020] Figure 3 A top view of a cutter head according to an embodiment of the utility model;

[0021] Figure 4 It is a partial side view of the cutter head according to the embodiment of the utility model. DETAILED DESCRIPTION

[0022] The utility model embodiment of a drill bit such as Figure 1-4 As shown: it includes a rod 2 and a cutter head 1 arranged at the top of the rod 2, the rod 2 is spirally provided with ribs 21 on the outside, spiral grooves 22 are formed between adjacent ribs 21 on the rod 2, and the end of the spiral groove 22 ends below the cutter head 1. The cutter head 1 includes a guide surface 11 which is arranged in an arc shape and the highest point of the arc surface is located at the center thereof, the end of the spiral groove 22 ends below the guide surface 11, second cutting heads 13 are arranged at both ends of the guide surface 11, and a first cutting head 12 which is inclined and has a height higher than the second cutting head 13 is arranged in the middle of the guide surface 11, and a chip groove 111 is arranged between the first cutting head 12 and the second cutting head 13 located on the left side of the guide surface 11, and between the first cutting head 12 and the second cutting head 13 located on the right side of the guide surface 11, and the two starting ends of the chip groove 111 are respectively connected near the first cutting head 12 and near the second cutting head 13, and the chip groove 111 has a protrusion toward the center of the guide surface 11 when viewed from a top view, that is, from the cross section of the chip groove 111, and the chip groove 111 partially extends into the spiral groove 22 located below the guide surface 11 according to its outer shape, so as to expand the chip flow efficiency while connecting the guide surface 11 and the spiral groove 22.

[0023] The first cutting edge 11 is composed of a first cutting edge 121 and a second cutting edge 122 which are symmetrically arranged. The first cutting edge 121 and the second cutting edge 122 are both inclined from the guide surface 11 toward a direction away from the guide surface 11, and the first cutting edge 121 and the second cutting edge 122 intersect at the center of the first cutting edge 11 and form a cutting tip of the first cutting edge 11 there. Similarly, the second cutting edge 12 is also composed of a third cutting edge 131 and a fourth cutting edge 132 which are symmetrically arranged. The third cutting edge 131 and the fourth cutting edge 132 are both inclined from the guide surface 11 toward a direction away from the guide surface 11, and the third cutting edge 131 and the fourth cutting edge 132 intersect at the center of the second cutting edge 12 and form a cutting tip of the second cutting edge 12 there. The cutting edge of the first cutting head 12 is gradually increased in height from the edge of the first cutting head 12 toward the center of the first cutting head 12 when viewed from the side, and a first peak 123 is formed at the center of the first cutting head 12; similarly, the cutting edge of the second cutting head 13 is gradually increased in height from the edge of the second cutting head 13 toward the center of the second cutting head 13 when viewed from the side, and a second peak 133 is formed at the center of the second cutting head 13; the first peak 123 and the second peak 133 are both conical and have arc shapes at their top ends.

[0024] The following is a brief description of the use of this embodiment: during the drilling process, as the drill bit rotates, the first tip 123 and the second tip 133 form a convex portion of the rotating drill bit to improve processing efficiency. At the same time, since the height of the first cutting head 12 is higher than the second cutting head 13, the processed chips will be guided to the guide surface 11, and then the chips will be guided to the chip removal groove 111 under the cooperation of the centripetal force and the shape of the arc-shaped guide surface 11, and discharged to the outside through the spiral groove 22.

[0025] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A drill bit, comprising a rod and a cutter head arranged at the top of the rod, wherein the outer spiral of the rod is provided with ribs, and spiral grooves are formed between adjacent ribs on the rod, characterized in that: The cutter head includes a guide surface, the end of the spiral groove ends at the lower side of the guide surface, a first cutting head and a second cutting head symmetrically arranged at both ends of the guide surface are provided on the guide surface, and a chip removal groove connecting the spiral groove and the guide surface is provided between the second cutting head located on the left and right sides of the first cutting head and the first cutting head.

2. A drill bit according to claim 1, characterized in that: The guide surface is an arc-shaped surface, and the highest point of the arc-shaped surface is located at the center of the guide surface. The cross section of the chip removal groove is formed with a protrusion extending toward the center of the guide surface.

3. A drill bit according to claim 2, characterized in that: The chip-removing groove partly extends into the spiral groove, and the part of the chip-removing groove extending into the spiral groove makes the surface of the spiral groove located at the lower side of the guide surface no longer be arc-shaped.

4. A drill bit according to claim 2, characterized in that: The second cutting edges are respectively located at the two side ends of the guide surface, the first cutting edges are obliquely distributed on the guide surface and the height of the first cutting edge is higher than the height of the second cutting edge, and the two ends of the cross section of the chip removal groove are respectively connected to the first cutting edge and the second cutting edge.

5. A drill bit according to claim 1, characterized in that: The first cutting edge includes a first cutting edge portion and a second cutting edge portion, both of which are inclined and intersect to form a cutting edge of the first cutting edge; the second cutting edge includes a third cutting edge portion and a fourth cutting edge portion, both of which are inclined and intersect to form a cutting edge of the second cutting edge.

6. A drill bit according to claim 5, characterized in that: The tip of the first cutting edge is inclined from the edge of the first cutting edge toward the center of the first cutting edge and a first tip is formed at the center of the first cutting edge; the tip of the second cutting edge is inclined from the edge of the second cutting edge toward the center of the second cutting edge and a second tip is formed at the center of the second cutting edge.

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