Drill bit

Abstract

The utility model provides a drill bit, and belongs to the technical field of hardware tools. The technical problem that when an existing handheld electric drill drills holes, the drilling depth is not easy to control is solved. The drill bit comprises a drill rod and a tool bit with a cutting edge, the tool bit is fixedly arranged at one end of the drill rod, and a clamping part used for being connected with an electric tool or a machine tool in a limiting mode is arranged on the peripheral face of the end, away from the tool bit, of the drill rod; at least one circle of annular protrusions used for achieving an identification effect are arranged on the peripheral face of the drill rod. According to the drill bit, at least one circle of annular protrusions used for achieving the marking effect are arranged on the peripheral face of the drill rod, so that the annular protrusions can be conveniently seen in the process that the drill bit is screwed into a drill hole, the drilling position can be accurately and conveniently known, accurate control over the drilling depth is achieved, and the drilling quality is improved.

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 used in machining or production operations, used to bore holes in workpieces or construction objects. Used in a variety of electric drills, drilling machines, and drilling rigs, it has a wide range of applications, and there are also many different types of drill bits. Typically, a drill bit consists of a shank with a tip containing a cutting edge and a chip flute. During use, the drill bit rotates around a vertical axis while simultaneously moving axially. The torque and axial force of the drill bit create a hole in the workpiece or construction object, and chips are discharged through the chip flute.

[0003] Drill bits have been around for a long time, and their manufacturing processes are relatively mature. Existing drill bits sometimes require a specific drilling depth based on design requirements. CNC machine tools can precisely control this based on a pre-set axial feed rate. However, current handheld electric drills can only roughly estimate the drilling depth based on experience and feel, resulting in significant errors in drilling dimensions. Utility Model Content

[0004] The utility model aims to solve the above problems in the existing technology and provides a drill bit. The technical problem to be solved by the utility model is: how to control the drilling depth of a handheld electric drill more conveniently and reliably.

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

[0006] A drill bit comprises a drill rod and a cutter head with a cutting edge, wherein the cutter head is fixedly mounted on one end portion of the drill rod, and the outer peripheral surface of the end of the drill rod away from the cutter head comprises a clamping portion for limiting connection with an electric tool or a machine tool; and the outer peripheral surface of the drill rod is provided with at least one circle of annular protrusions for serving as an identification.

[0007] The principle is as follows: when the drill bit is in use, the drill rod of the drill bit is fixed to the drill chuck of the power tool through the clamping part. The entire drill bit rotates circumferentially and feeds axially at the same time. The cutter head uses the cutting edge to drill holes on the workpiece and feed. In this technical solution, the drill bit is optimized and improved. At least one circle of annular protrusions for marking is provided on the outer peripheral surface of the drill rod, so that the annular protrusions can be easily seen during the process of the drill bit being screwed into the hole. By knowing the drill bit size specification information in advance, the actual drilling depth of the drill bit can be clearly known. In particular, for some operation scenarios with predetermined drilling depths, the corresponding setting position of the specially made annular protrusion can be used to know the drilling position more accurately and conveniently, thereby achieving precise control of the drilling and improving the drilling quality.

[0008] In the drill bit, the cutting edges around the drill head protrude from the outer circumferential surface of the drill rod; the outer circumferential surface of the annular protrusion is a cylindrical surface, and the height of the annular protrusion protruding from the outer circumferential surface of the drill rod is less than or equal to the height of the cutting edges around the drill head protruding from the outer circumferential surface of the drill rod.

[0009] By adopting the technical scheme, even if the drill bit drills a deep hole whose depth exceeds the position of the annular protrusion on the drill rod, the annular protrusion can extend into the hole, without affecting the normal drilling, and the design of the annular protrusion does not affect the strength of the drill rod, but increases the diameter of the drill rod, is not easy to break compared with the annular groove, and improves the service life of the drill bit. In addition, the annular protrusion can also stabilize the drill rod in the hole, reducing the left and right swing or shaking of the drill rod.

[0010] In the drill bit, a spiral chip removal groove is arranged on the outer circumferential surface of the drill rod, one end of the chip removal groove is located at the drill head, and the other end is located at the middle of the drill rod; the annular protrusion is located between the chip removal groove and the clamping portion.

[0011] By adopting the technical scheme, the annular protrusion does not affect the normal chip removal function of the chip removal groove, and can meet the requirements of the usual design of the drilling depth.

[0012] In the drill bit, the axial straight length a of the chip removal groove on the drill rod is 20 mm, 30 mm, 40 mm, 50 mm or 70 mm, the spacing b between the end of the chip removal groove and the annular protrusion is 10 mm, and the spacing c between the annular protrusion and the clamping portion is 10 mm.

[0013] By adopting the technical scheme, the requirements of most drilling depth sizes at present can be met, and the normal chip removal and clamping of the drill bit are not affected.

[0014] In the drill bit, the number of the annular protrusions is one or two or three or four, and when the number of the annular protrusions is multiple, all the annular protrusions are uniformly spaced along the length direction of the drill rod.

[0015] By adopting the technical scheme, the requirements of multiple different drilling depth sizes can be met, thereby improving the versatility of the drill bit, and making the control of the drilling depth more accurate and reliable.

[0016] In the drill bit, the outer circumferential surface of the annular protrusion is coated with an identification color that is obviously different from the color of the outer circumferential surface of the drill rod.

[0017] The identification color can be red, blue or gold, etc., and can be painted or electroplated. By adopting the above technical solution, the color difference is more obvious, thereby facilitating observation.

[0018] Compared with the existing technology, the technical solution in the utility model is to provide at least one circle of annular protrusions on the outer peripheral surface of the drill rod for marking, so that the annular protrusions can be easily seen during the process of the drill bit being screwed into the drilling hole, thereby being able to know the drilling position more accurately and conveniently, achieving precise control of the drilling depth, and improving the drilling quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the drill bit in Example 1 of the present application.

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the drill bit in Example 2 of the present application.

[0021] In the picture:

[0022] 10. Drill rod; 11. Clamping portion; 12. Chip removal groove; 13. Annular protrusion;

[0023] 20. Cutting head; 21. Cutting edge; 211. Cutting tip; 212. Groove. DETAILED DESCRIPTION

[0024] 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.

[0025] Example 1

[0026] like Figure 1 As shown, the drill bit in this embodiment includes a drill rod 10 and a cutter head 20 with a cutting edge 21. The cutter head 20 is fixed to one end of the drill rod 10. The outer peripheral surface of the end of the drill rod 10 away from the cutter head 20 has a clamping portion 11 for limiting connection with an electric tool or a machine tool; the outer peripheral surface of the drill rod 10 is provided with at least one circle of annular protrusions 13 for marking.

[0027] The cutting edges 21 around the head 20 protrude from the outer circumferential surface of the drill rod 10; the outer circumferential surface of the annular protrusion 13 is a cylindrical surface, and the height of the annular protrusion 13 protruding from the outer circumferential surface of the drill rod 10 is less than or equal to the height of the cutting edges 21 around the head 20 protruding from the outer circumferential surface of the drill rod 10. When the drill bit drills a deep hole whose depth exceeds the position of the annular protrusion 13 on the drill rod 10, the annular protrusion 13 can extend into the hole without affecting the normal drilling process. At the same time, the design of the annular protrusion 13 does not affect the strength of the drill rod 10, but rather increases the diameter of the drill rod 10, which is less likely to break compared to opening an annular groove 212, thereby improving the service life of the drill bit. In addition, the annular protrusion can also stabilize the drill rod in the hole, reducing its left and right swing or shaking.

[0028] As shown in Figure 1 the outer circumferential surface of the drill rod 10 is provided with a spiral-shaped chip removal groove 12, one end of the chip removal groove 12 is located at the head 20, and the other end is located at the middle of the drill rod 10; the annular protrusion 13 is located between the chip removal groove 12 and the clamping portion 11. The drill bit can be provided in multiple different specifications, and the corresponding overall length is different, for example, it can be a No. 5 drill bit with an overall length of 85 mm, a No. 6 drill bit with an overall length of 95 mm, a No. 8 drill bit with an overall length of 105 mm, a No. 10 drill bit with an overall length of 115 mm, and a No. 12 drill bit with an overall length of 125 mm. The axial straight length a of the corresponding chip removal groove 12 on the drill rod 10 is 20 mm, 30 mm, 40 mm, 50 mm, and 70 mm, respectively. In the above-mentioned drill bits of different specifications, the spacing b between the end of the chip removal groove 12 and the annular protrusion 13 is 10 mm, and the spacing c between the annular protrusion 13 and the clamping portion 11 is 10 mm. The annular protrusion 13 in the present application does not affect the normal chip removal function of the chip removal groove 12, and at the same time can meet the usual design requirements of drilling depth.

[0029] The implementation principle is as follows: when the drill bit is in use, the drill rod 10 of the drill bit is fixedly connected to the drill chuck of the electric tool through the clamping portion 11, the entire drill bit rotates circumferentially and simultaneously moves axially, and the head 20 uses the cutting edges 21 to drill a hole in the workpiece. In the technical solution, the drill bit is optimized and improved, at least one annular protrusion 13 for identification is arranged on the outer circumferential surface of the drill rod 10, so that the annular protrusion 13 can be easily seen during the rotation of the drill bit into the hole, and the actual drilling depth of the drill bit can be clearly known by knowing the size specification information of the drill bit in advance. Especially in some predetermined drilling depth operation scenarios, the corresponding setting position of the specially designed annular protrusion 13 can accurately and conveniently know the drilling position, thereby realizing accurate control of drilling and improving the drilling quality.

[0030] Embodiment 2

[0031] As shown in Figure 2As shown, this embodiment is the same as embodiment 1, except that the structure of the cutter head 20 in this embodiment is different from that of the cutter head 20 in embodiment 1. In this embodiment, the outer periphery of the cutter head 20 is provided with four cutting edges 21, and all the cutting edges 21 are evenly spaced along the circumference of the cutter head 20. A cross groove is provided at the end of the drill rod 10, and the cutter head 20 is embedded in the cross groove and fixed to the drill rod 10 by welding; the four cutting edges 21 extend obliquely toward the center direction of the end of the cutter head 20 away from the cutter rod and then converge at the center line of the cutter head 20 to form a cutting tip 211; 2-5 grooves 212 are provided on the outer side surface of each cutting edge 21 of the outer periphery of the cutter head 20, and in this embodiment, the number of grooves 212 is preferably 3 or 4; the two ends of the groove 212 in the length direction respectively pass through the two sides of the cutting edge 21; the groove 212 can be an arc groove 212 or a rectangular groove 212, the groove width of the groove 212 is 3mm, 3.5mm, 6mm or 7mm, and the depth of the groove 212 is 0.5mm, 0.85mm, 1.1mm, 1.4mm or 1.8mm.

[0032] like Figure 2 As shown, the drill rod 10 in this embodiment can be provided with the same spiral chip flute 12 as in Example 1, or it can be omitted. The drill rod 10 is a polished rod. When provided with the chip flute 12, the number of annular protrusions 13 is one. When not provided with the chip flute 12, the number of annular protrusions 13 can be two, three, or four, in which case all annular protrusions 13 are evenly spaced along the length of the drill rod 10. This allows for the realization of multiple different drilling depth requirements, thereby improving the versatility of the drill bit and making drilling depth control more precise and reliable.

[0033] In this embodiment, the outer surface of the annular protrusion 13 is coated with an identification color that is distinct from the outer surface of the drill rod 10. This identification color can be red, blue, or gold, and can be applied using paint or electroplating. Multiple annular protrusions 13 on the same drill rod 10 can have different identification colors applied to their outer surfaces, making the color distinction more distinct and easier to observe.

[0034] As an alternative or equivalent solution, the cutter head 20 in the present application may also be a cutter head 20 of other styles in the prior art.

[0035] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A drill bit comprising a shank (10) and a head (20) having a cutting edge (21), said head (20) being fixed to one end of said shank (10), said shank (10) having a clamping portion (11) on the outer periphery of the end remote from said head (20) for limited connection with an electric tool or machine tool; characterized in that, The drill rod (10) is provided with at least one annular protrusion (13) for identification on the outer periphery thereof.

2. The drill bit of claim 1, wherein, The cutting edges (21) around the drill head (20) protrude from the outer periphery of the drill rod (10); the outer periphery of the annular protrusion (13) is a cylindrical surface, and the height of the annular protrusion (13) protruding from the outer periphery of the drill rod (10) is less than or equal to the height of the cutting edges (21) around the drill head (20) protruding from the outer periphery of the drill rod (10).

3. The drill bit of claim 1 or 2, wherein, The drill rod (10) is provided with a spiral-shaped chip removal groove (12) on the outer periphery thereof, one end of the chip removal groove (12) being located at the drill head (20) and the other end being located at the middle of the drill rod (10); the annular protrusion (13) is located between the chip removal groove (12) and the clamping portion (11).

4. The drill bit of claim 3, wherein, The axial linear length a of the chip removal groove (12) on the drill rod (10) is 20 mm, 30 mm, 40 mm, 50 mm or 70 mm, the spacing b between the end of the chip removal groove (12) and the annular protrusion (13) is 10 mm, and the spacing c between the annular protrusion (13) and the clamping portion (11) is 10 mm.

5. The drill bit of claims 1 or 2, wherein, The number of the annular protrusions (13) is one or two or three or four, and when the number of the annular protrusions (13) is more than one, all the annular protrusions (13) are uniformly spaced along the length direction of the drill rod (10).

6. The drill bit of claims 1 or 2, wherein, The outer periphery of the annular protrusion (13) is coated with an identification color that is obviously different from the color of the outer periphery of the drill rod (10).

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