Improved drill bit

Abstract

The present application provides an improved structure of a drill bit, which is formed with a cutting edge portion on one side of a shank portion, and the cutting edge portion comprises a cutting section and a chip flute extending around from the cutting section to the shank portion, and the cutting section comprises two main cutting edges, a first flank surface extending at different angles from the side edges of the two main cutting edges, a second flank surface, two thinning cutting edges, a thinning cutting bevel inclined at an acute angle from the side edges of the two thinning cutting edges, and at least one thinning auxiliary bevel, so as to increase the core thickness of the center of the drill bit and improve the cutting capacity of the drill bit.

Description

Technical Field

[0001] This invention relates to an improved drill bit structure, and more particularly to a drill bit structure that can increase the cutting range to improve drilling capability. It is achieved by adding two thinning cutting edges and a thinning cutting bevel with an acute angle on the side of the two thinning cutting edges, thereby extending the length of the original main cutting edge, increasing the core thickness at the center of the drill bit and improving the cutting capability of the drill bit. Background Technology

[0002] In machining operations, drilling is a crucial process. Many workpieces require drilling during manufacturing to create necessary holes for subsequent processing. Drill bits are essential tools for drilling various types of holes, such as through holes or blind holes. The cutting end of the drill bit, with its spiral cutting edges on both sides, is a critical structural element that affects the smoothness of the machining process. Depending on the outer diameter of the drill bit, the core thickness also varies, allowing for the drilling of holes of different sizes.

[0003] When a drill bit performs drilling operations, it cuts the workpiece by contacting the two cutting edges on its cutting end. The two cutting edges have inclined chip-removal surfaces extending to spiral chip-removal grooves on both sides for outward chip discharge. Please also refer to... Figures 9-11 As shown, the core thickness AH of the adjacent center positions of the two cutting edges A1 of drill bit A is relatively narrow, accounting for only about 30% to 40% of the diameter AOD (mm) of drill bit A. As a result, the strength of the two cutting edges A1 is poor, making them prone to collapse or breakage. Furthermore, there is no proper spacing or angle between the two cutting edges A1 and the adjacent chip grooves A2. This makes it difficult to cut the waste chips generated after the two cutting edges A1 drill the workpiece. The chips accumulate in the chip grooves A2 and are squeezed, which not only affects the smoothness of the drilling process of drill bit A, but also causes scratches to form on the wall of the drilled hole due to the friction of the waste chips accumulated in the chip grooves A2, resulting in poor drilling quality. In some cases, the waste chips squeezed in the chip grooves A2 may even cause drill bit A to break during drilling. Many defects affecting the structural strength of drill bit A and the smoothness of drilling operations need to be improved.

[0004] Therefore, how to solve the problems and troubles of poor chip removal during drilling and cutting operations, which leads to unstable drilling and cutting operations, and the trouble and shortcomings of chip removal grooves in drill bits that easily accumulate waste chips, which have adverse effects on both the drill bit and the workpiece to be processed, is the direction that relevant manufacturers in this industry are eager to research and improve. Summary of the Invention

[0005] Therefore, in view of the above-mentioned problems and deficiencies, the main objective of the present invention is to provide an improved structure for a drill bit.

[0006] This invention provides an improved drill bit structure, comprising a shank and a cutting edge, characterized in that:

[0007] The handle has a blade formed on one side, and the outer diameter of the handle is 1.9 to 3.3 mm.

[0008] The cutting edge includes a cutting section and a chip removal groove extending around the cutting section to the shank. The cutting section includes two main cutting edges, a first cutting face and a second cutting face that extend obliquely to the chip removal groove at different angles from the sides of the two main cutting edges, two thinning cutting edges, and at least one thinning auxiliary inclined surface that is inclined at an acute angle from the sides of the two thinning cutting edges. The two thinning cutting edges, the at least one thinning auxiliary inclined surface and the two main cutting edges are respectively provided with a thinning cutting inclined surface that is inclined at an acute angle to the center point between the two main cutting edges.

[0009] The improved structure of the drill bit, wherein the outer diameter of the cutting edge of the drill bit is 0.05 to 0.6 mm.

[0010] The improved structure of the drill bit, wherein: the central core thickness of the cutting edge formed by the first cutting surface, the second cutting surface and the two thinning auxiliary inclined surfaces on both sides of the two main cutting edges accounts for 40% to 70% of the diameter of the cutting edge.

[0011] The improved structure of the drill bit, wherein: the two thinning auxiliary inclined surfaces form an acute angle between the two main cutting edges and the center point, and each of the thinning cutting inclined surfaces forms a first thinning angle, and each of the first thinning angles has an acute angle of inclination of 25° to 70°.

[0012] The improved structure of the drill bit, wherein: the two thinning auxiliary inclined surfaces form an acute angle between the two main cutting edges and the center point, and the two thinning cutting inclined surfaces form a second thinning angle, and each of the second thinning angles has an acute angle of 5° to 55°.

[0013] The improved structure of the drill bit, wherein: the two thinning cutting edges of the cutting edge of the drill bit cross each chisel line extending from both sides of the center point, and are then respectively machined into at least one first thinning auxiliary bevel; or the two thinning cutting edges of the cutting edge of the drill bit are respectively machined into two first thinning auxiliary bevels and two second thinning auxiliary bevels in the shape of acute angle or obtuse angle along the edges of each chisel line extending from both sides of the center point.

[0014] This invention can increase the core thickness at the center of the drill bit and improve the cutting capability of the two main cutting edges of the drill bit. Attached Figure Description

[0015] Figure 1 This is a side view of the exterior of the present invention.

[0016] Figure 2 This is a front view of the cutting edge of the drill bit of the present invention.

[0017] Figure 3a , Figure 3b These are, respectively, a partially enlarged front view (a) and a side view (a) of the cutting edge of the drill bit of the present invention.

[0018] Figure 4a , Figure 4b These are, respectively, a partially enlarged front view (II) and a side view (II) of the cutting edge of the drill bit of the present invention.

[0019] Figure 5 This is a side cross-sectional view of the cutting edge of the drill bit of the present invention.

[0020] Figure 6 This is a front view of the first embodiment of the cutting edge of the drill bit of the present invention.

[0021] Figure 7 This is a front view of a second embodiment of the cutting edge of the drill bit of the present invention.

[0022] Figure 8 This is a front view of the cutting edge portion of the drill bit of the present invention, according to a third embodiment.

[0023] Figure 9 This is a front view of the cutting edge of a conventional drill bit.

[0024] Figure 10 This is a magnified side view of the cutting edge of a conventional drill bit.

[0025] Figure 11 This is a side sectional view of the cutting edge of a conventional drill bit.

[0026] Explanation of reference numerals in the attached drawings: 1-Drill bit; 11-Shantl; 11L-Shantl outer diameter; 12-Cutting edge; 121-Cutting section; 122-Chip groove; 1221-Main chip groove; 1222-Escape groove; 123-Thinning cutting edge; 1231-First cutting face; 1232-Second cutting face; 1233-First thinning auxiliary bevel; 1234-Thinning cutting bevel; 1235-Center point; 1236-Chisel line; 1237-Second thinning auxiliary bevel; 124-Main cutting edge; 12H-Center core thickness; 12OD-Diameter; θ1-First thinning angle; θ2-Second thinning angle; A-Drill bit; A1-Cutting edge; A2-Chip groove; AH-Core thickness; AOD-Diameter. Detailed Implementation

[0027] To achieve the above objectives and effects, the technical means, construction, and implementation methods adopted by the present invention are described in detail below with reference to the accompanying drawings, so as to facilitate a complete understanding.

[0028] Please see Figures 1-5 As shown in the figure, it can be clearly seen that the present invention provides an improved structure for a drill bit, the drill bit 1 including a shank 11 and a cutting edge 12, wherein:

[0029] The shank 11 of the drill bit 1 extends from one side to form a cutting edge 12, and the outer diameter (diameter 12OD) of the cutting edge 12 of the drill bit 1 is also referred to. Figure 2 , Figure 5 The preferred embodiment of the dimensions shown may be 0.05 to 0.6 mm; and the outer diameter 11L of the handle 11 (please also refer to...) Figure 1 The preferred embodiment (shown) may be 1.9 to 3.3 millimeters (mm), etc.

[0030] The cutting edge 12 includes a cutting section 121 and a chip removal groove 122 extending around the cutting section 121 to the shank 11. The cutting section 121 includes two main cutting edges 124, a first cutting surface 1231 and a second cutting surface 1232 located at different angles extending obliquely to the sides of the two main cutting edges 124, two thinning cutting edges 123, and at least one first thinning auxiliary inclined surface 1233 located at an acute angle to the sides of the two thinning cutting edges 123. Each first cutting surface 1231, each second cutting surface 1232, each thinning cutting edge 123, and each at least one first thinning auxiliary inclined surface 1233 extend obliquely to the chip removal groove 122. A thinning cutting inclined surface 1234 is provided between the two first thinning auxiliary inclined surfaces 1233 and the two thinning cutting edges 123. Each thinning cutting inclined surface 1234 forms a first thinning angle (θ1) with an acute angle between itself and the center point 1235.

[0031] The cutting edge 12 of the drill bit 1 of the present invention is formed by the two first cutting surfaces 1231, the second cutting surfaces 1232 and the two first thinning auxiliary inclined surfaces 1233 on both sides of the two thinning cutting edges 123, with a central core thickness 12H. The central core thickness 12H accounts for about 40% to 70% of the diameter 12OD (mm) of the cutting edge 12. The central core thickness 12H of the two thinning cutting edges 123 of the cutting edge 12 can increase the structural strength of the cutting edge 12 and improve the drilling and cutting efficiency of the two thinning cutting edges 123. This achieves the purpose of increasing the central core thickness 12H of the drill bit 1 and improving the cutting ability of the drill bit. It can be used for drilling and cutting operations on thin or soft materials (such as circuit boards, copper plates, aluminum plates or lead plates).

[0032] Furthermore, in the cutting edge portion 12 of the drill bit 1 of the present invention, the two first thinning auxiliary inclined surfaces 1233 are each thinning cutting inclined surface 1234 that can form an acute angle with the two thinning cutting edges 123. The first thinning angle (θ1) between each thinning cutting inclined surface 1234 and the center point 1235 can be an acute angle of inclination of 25° to 70° respectively (please refer to the accompanying document). Figure 4a , Figure 4b As shown, Figure 4a Front view of the blade 12 Figure 4b (This is a side view of the blade portion 12), and a second thinning angle (θ2) is also formed between it and the axial horizontal line of the center point 1235. This second thinning angle (θ2) can be an acute angle ranging from 5° to 55° (please also refer to...). Figure 3a , Figure 3b As shown, Figure 3a A front view of the blade section 12 from another perspective. Figure 3b (This is a side view of the cutting edge 12 from another perspective), which can improve the effect of the two thinning cutting edges 123 in cutting off the waste material during drilling and can guide the waste material into the second chip groove 122 and discharge it outward.

[0033] Furthermore, the two thinning cutting edges 123 of the cutting edge portion 12 of the drill bit 1 of the present invention are provided with two chip removal grooves 122 on each side. These include main chip removal grooves 1221 that extend spirally from the inner side of the thinning cutting slope 1234 on both sides to the shank portion 11. The outer side of each adjacent main chip removal groove 1221 is formed with a reduced width area escape groove 1222. That is, the area of ​​each main chip removal groove 1221 is larger than the area of ​​each escape groove 1222, which can effectively increase the chip removal space of the two chip removal grooves 122, thereby avoiding the accumulation and compression of waste chips in each chip removal groove 122 and effectively improving the chip removal capacity of the drill bit 1 during drilling and cutting.

[0034] Please see again Figures 1 to 8As shown in the figure, it can be clearly seen that the present invention provides an improved structure for a drill bit. In a preferred embodiment, the outer diameter (diameter) of the drill bit 1 can be 0.05 to 0.6 millimeters (mm). Furthermore, the two thinning cutting edges 123 of the cutting edge portion 12 of the drill bit 1 are respectively machined into two first thinning auxiliary bevels 1233 along the edges of each chisel cutting line 1236 extending from the center point 1235. (The two thinning cutting edges 123 are respectively close to each chisel cutting line 1236; please also refer to...) Figure 6 (as shown); or the two thinning cutting edges 123 of the cutting edge portion 12 of the drill bit 1 can respectively cross the chisel cutting lines 1236 extending from both sides of the center point 1235, and then be respectively machined into at least one first thinning auxiliary bevel 1233 (please also refer to as shown). Figure 6 , Figure 7 (As shown); Additionally, the two thinning cutting edges 123 of the cutting edge portion 12 of the drill bit 1 can be machined into two acute-angle (or obtuse-angle, etc.) first thinning auxiliary bevels 1233 and two second thinning auxiliary bevels 1237, respectively, extending along the edges of each chisel cutting line 1236 on both sides of the center point 1235 (the two thinning cutting edges 123 are respectively close to each chisel cutting line 1236; please refer to the following simultaneously). Figure 8 As shown); the drill bit 1, which is used for various types of machining, can be processed by at least one first thinning auxiliary inclined surface 1233 of different types on the side of the two thinning cutting edges 123 (such as curved surface, acute angle or obtuse angle, etc.). When the waste material generated by the drill bit 1 during machining using each thinning cutting edge 123 is processed, it can smoothly enter the main chip removal groove 1221 and the escape groove 1222 of each chip removal groove 122 along each first thinning auxiliary inclined surface 1233 and each second thinning auxiliary inclined surface 1237, and can be quickly discharged outward, so as to improve the machining cutting ability and good chip removal function of the drill bit 1, and also increase the cutting ability of the drill bit 1.

[0035] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Therefore, any simple modifications and equivalent structural changes made based on the description and drawings of the present invention should also be included within the patent scope of the present invention.

Claims

1. An improved structure for a drill bit, comprising a shank and a cutting edge, characterized in that: The handle has a blade formed on one side, and the outer diameter of the handle is 1.9 to 3.3 mm. The cutting edge includes a cutting section and a chip removal groove extending around the cutting section to the shank. The cutting section includes two main cutting edges, a first cutting surface and a second cutting surface that extend obliquely to the chip removal groove at different angles on the sides of the two main cutting edges, two thinning cutting edges, and at least one thinning auxiliary inclined surface that is inclined at an acute angle on the sides of the two thinning cutting edges. The two thinning cutting edges, the at least one thinning auxiliary inclined surface and the two main cutting edges are respectively provided with a thinning cutting inclined surface that is inclined at an acute angle to the center point between the two main cutting edges.

2. The improved drill bit structure as described in claim 1, characterized in that: The outer diameter of the cutting edge of this drill bit is 0.05 to 0.6 mm.

3. The improved drill bit structure as described in claim 1, characterized in that: The central core thickness of the cutting edge formed by the first cutting surface, the second cutting surface, and the two thinning auxiliary bevels on both sides of the two main cutting edges accounts for 40% to 70% of the diameter of the cutting edge.

4. The improved drill bit structure as described in claim 1, characterized in that: The two thinning auxiliary inclined surfaces form an acute angle between themselves and the two main cutting edges. Each thinning cutting inclined surface and the center point form a first thinning angle, and each first thinning angle has an acute angle of inclination of 25° to 70°.

5. The improved drill bit structure as described in claim 1, characterized in that: The two thinning auxiliary inclined surfaces form an acute angle between themselves and the two main cutting edges. The angle between each thinning cutting inclined surface and the center point forms a second thinning angle, and each second thinning angle has an acute angle of 5° to 55°.

6. The improved drill bit structure as described in claim 1, characterized in that: The two thinning cutting edges of the cutting edge of the drill bit cross each chisel line extending from both sides of the center point, and are then respectively machined into at least one first thinning auxiliary bevel; or the two thinning cutting edges of the cutting edge of the drill bit are respectively machined into two first thinning auxiliary bevels and two second thinning auxiliary bevels in the shape of acute angle or obtuse angle along the edges of each chisel line extending from both sides of the center point.

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