Improved structure of drill bit

Abstract

The utility model provides an improved structure of a drill bit, which is characterized in that a cutting edge part is formed on one side of a handle part of the drill bit, and the cutting edge part comprises a cutting section and a chip groove extending from the cutting section to the handle part in a surrounding manner; the cutting section comprises two main cutting edges, a first edge face, a second edge face, two thinning cutting edges, thinning cutting inclined faces and at least one thinning auxiliary inclined face, wherein the first edge face and the second edge face are located on the side edges of the two main cutting edges and obliquely extend at different angles, and the thinning cutting inclined faces are located on the side edges of the two thinning cutting edges and incline at acute angles. The core thickness of the center of the drill bit is increased, and the cutting capacity of the drill bit is improved.

Description

Technical Field

[0001] The utility model relates to an improved structure of a drill bit, and in particular to a drill bit structure capable of increasing the cutting range to enhance the drilling ability. The utility model increases two thinning cutting edges and a thinning cutting bevel with an acute angle on the side of the two thinning cutting edges, extends the length of the original main cutting edge, and achieves the purpose of increasing the core thickness at the center of the drill bit and improving the cutting ability of the drill bit. Background Art

[0002] In mechanical processing operations, drilling processing is a very important process in the mechanical processing process. Many objects to be processed may need to be drilled during the manufacturing process to produce necessary holes on the objects to be processed for subsequent processing. When performing drilling processing operations, a drill bit is a necessary tool for drilling various holes on the objects to be processed to form various through holes or non-through blind hole patterns, etc. In the processing process of the drill bit, the drill bits used are mostly spiral cutting blades on both sides of the drill bit. The cutting end at one end of the two spiral blades is an important structure of the drill bit, which affects the smoothness of the processing operation. According to the different outer diameters of the drill bit, the core thickness will also vary, and holes of different sizes can be drilled on the objects to be processed.

[0003] When a drill is used for drilling, the two cutting edges on the cutting end contact the object to be processed for cutting. Because the two cutting edges have inclined chip removal surfaces on both sides extending to the spiral chip removal grooves on both sides for chip removal, please also refer to Figures 9 to 11 As shown, however, since the core thickness AH of the adjacent center position of the second cutting edge A1 of the drill bit A is relatively narrow, the core thickness AH only accounts for about 30% to 40% of the diameter AOD (millimeter, mm) of the drill bit A, the strength of the second cutting edge A1 is poor and it is easy to cause defects such as collapse or breakage. In addition, there is no appropriate spacing or angle between the second cutting edge A1 and the adjacent chip grooves A2, resulting in the waste chips generated after the second cutting edge A1 drills the object to be processed. It is not easy to be cut off, and is accumulated at the second chip grooves A2 and squeezed, which not only affects the smooth drilling of the drill bit A, but also causes the waste chips accumulated at the second chip grooves A2 to rub against the wall of the drilled hole to form scratches, affecting the deterioration of the drilling quality. Even because the waste chips are squeezed at the second chip grooves A2, it is easy to cause the drill bit A to break during drilling and cutting. Many defects that affect the structural strength of the drill bit A and the smooth drilling operation need to be improved.

[0004] Therefore, how to solve the current problems and troubles such as the drill bit's poor chip removal during drilling and cutting operations, resulting in unstable drilling and cutting operations, and the drill bit's chip groove easily accumulating waste chips, which has an adverse effect on both the drill bit and the object to be processed, is the direction that the relevant manufacturers engaged in this industry are eager to study and improve. Utility Model Content

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

[0006] The utility model provides an improved structure of a drill bit, comprising a handle and a blade, and is characterized in that:

[0007] A blade portion is formed on one side of the handle, and the outer diameter of the handle is 1.9 to 3.3 mm;

[0008] The blade portion includes a cutting section and a chip groove extending from the cutting section to the shank portion, and the cutting section includes two main cutting edges, a first edge face located on the sides of the two main cutting edges and extending obliquely to the chip groove at different angles, a second edge face, two thinning cutting edges and at least one thinning auxiliary bevel located on the sides of the two thinning cutting edges and inclined at an acute angle, and thinning cutting bevels are respectively provided between the two thinning cutting edges, the at least one thinning auxiliary bevel and the two main cutting edges, and the thinning cutting bevels are 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 blade portion of the drill bit is 0.05-0.6 mm.

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

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

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

[0013] The improved structure of the drill bit, wherein: the two thinning cutting edges of the blade portion of the drill bit respectively cross the chiseling lines extending on both sides of the center point, and are then respectively processed to form at least one first thinning auxiliary bevel; or the two thinning cutting edges of the blade portion of the drill bit are the edges of the chiseling lines extending on both sides of the center point, and are respectively processed to form two first thinning auxiliary bevels and two second thinning auxiliary bevels in an acute or obtuse angle.

[0014] The utility model can increase the core thickness of the drill bit center and improve the cutting ability of the two main cutting edges of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side view of the appearance of the utility model.

[0016] Figure 2 It is a front view of the blade portion of the drill bit of the utility model.

[0017] Figure 3a , Figure 3b They are respectively a partially enlarged front view (I) and a side view (II) of the blade portion of the drill bit of the utility model.

[0018] Figure 4a , Figure 4b They are respectively a partially enlarged front view (two) and a side view (three) of the blade portion of the drill bit of the utility model.

[0019] Figure 5 It is a side cross-sectional view of the blade portion of the drill bit of the utility model.

[0020] Figure 6 It is a front view of the first embodiment of the blade portion of the drill bit of the utility model.

[0021] Figure 7 It is a front view of the second embodiment of the blade portion of the drill bit of the utility model.

[0022] Figure 8 It is a front view of the third embodiment of the blade portion of the drill bit of the utility model.

[0023] Fig. 9 The front view of the blade of a conventional drill bit.

[0024] Fig.10 It is a partial enlarged side view of the cutting edge of a conventional drill bit.

[0025] Fig.11 It is a side cross-sectional view of the blade portion of a conventional drill bit.

[0026] Explanation of the reference numerals: 1-drill bit; 11-shank; 11L-shank outer diameter; 12-blade; 121-cutting section; 122-chip groove; 1221-main chip groove; 1222-escape groove; 123-thinning cutting edge; 1231-first blade surface; 1232-second blade surface; 1233-first thinning auxiliary bevel; 1234-thinning cutting bevel; 1235-center point; 1236-chisel edge 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 blade; A2-chip groove; AH-core thickness; AOD-diameter. DETAILED DESCRIPTION

[0027] In order to achieve the above-mentioned purpose and effect, the technical means and its structure, implementation method, etc. adopted by the utility model are now described in detail with reference to the accompanying drawings for the preferred embodiment of the utility model, and its features and functions are as follows to facilitate a complete understanding.

[0028] See also Figure 1 to Figure 5 As shown in the figure, it can be clearly seen that the utility model provides an improved structure of a drill bit, the drill bit 1 includes a shank 11 and a blade 12, wherein:

[0029] The shank 11 of the drill bit 1 is extended from one side to form a blade 12, and the outer diameter (diameter 12OD, please also refer to Figure 2 , Figure 5 The preferred embodiment of the size of the handle 11 is 0.05 to 0.6 mm, etc.; and the handle outer diameter 11L of the handle 11 (please also refer to Figure 1 The preferred embodiment of the present invention (as shown) can be 1.9 to 3.3 millimeters (mm), etc.

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

[0031] The blade portion 12 of the drill bit 1 of the utility model has a central core thickness 12H formed by two first blade surfaces 1231, a second blade surface 1232 and two first thinning auxiliary inclined surfaces 1233 on two sides of the two thinning cutting edges 123, and the central core thickness 12H accounts for about 40% to 70% of the diameter 12OD (millimeter, mm) of the blade portion 12; the central core thickness 12H of the two thinning cutting edges 123 of the blade portion 12 can be used to increase the structural strength of the blade portion 12 and improve the drilling and cutting effect of the two thinning cutting edges 123, thereby achieving the purpose of increasing the central core thickness 12H of the drill bit 1 and improving the cutting ability of the drill bit, and can be used for drilling and cutting operations of thin or soft plates (such as circuit boards, copper plates, aluminum plates or lead plates, etc.) to be processed.

[0032] In addition, the blade portion 12 of the drill bit 1 of the utility model, the two first thinning auxiliary bevels 1233 are thinning cutting bevels 1234 that can form an acute angle with the two thinning cutting edges 123, and the first thinning angle (θ1) between each thinning cutting bevel 1234 and the center point 1235 can be an acute angle of 25° to 70° (please also refer to Figure 4a , Figure 4b As shown, Figure 4a is a front view of the blade portion 12, Figure 4b The second thinning angle (θ2) is formed between the axial horizontal line of the center point 1235, and the second thinning angle (θ2) can be an acute angle of 5° to 55° (please also refer to Figure 3a , Figure 3b As shown, Figure 3a is a front view of the blade portion 12 from another perspective, Figure 3b 12 is a side view from another angle of the blade portion 12), which can be used to enhance the effect of the two thin cutting edges 123 in cutting off the waste materials during drilling and cutting, and can guide the waste materials into the two chip discharge grooves 122 and be discharged outward.

[0033] Furthermore, the two thinned cutting edges 123 of the blade portion 12 of the drill bit 1 of the utility model are provided on each chip groove 122 on both sides, including main chip grooves 1221 extending spirally to the shank 11 from the inner sides of the thinned cutting bevels 1234 on both sides, and the outer sides of adjacent main chip grooves 1221 are respectively formed with escape grooves 1222 with reduced width areas, that is, the area of ​​each main chip groove 1221 is larger than the area of ​​each escape groove 1222, which can effectively increase the chip removal space of the two chip grooves 122, thereby achieving the purpose of avoiding the accumulation and squeezing of waste chips in each chip groove 122, and effectively improving the chip removal ability of the drill bit 1 during drilling and cutting processing.

[0034] Please see again Figures 1 to 8As shown in the figure, it can be clearly seen that the utility model provides an improved structure of a drill bit. The outer diameter (diameter) size of the drill bit 1 in a preferred embodiment can be 0.05-0.6 mm, etc., and the two thinning cutting edges 123 of the blade portion 12 of the drill bit 1 can be formed along the edges of each chisel edge line 1236 extending on both sides of the center point 1235, and two first thinning auxiliary inclined surfaces 1233 are respectively processed (the two thinning cutting edges 123 are respectively close to each chisel edge line 1236, please also refer to Figure 6 or the two thinning cutting edges 123 of the blade portion 12 of the drill bit 1 can respectively cross the chisel edge lines 1236 extending from both sides of the center point 1235, and then respectively form at least one first thinning auxiliary inclined surface 1233 (please also refer to Figure 6 , Figure 7 In addition, the two thinning cutting edges 123 of the blade portion 12 of the drill bit 1 can be formed into two first thinning auxiliary bevels 1233 and two second thinning auxiliary bevels 1237 (the two thinning cutting edges 123 are close to the chisel edge lines 1236, respectively, along the edges of the chisel edge lines 1236 extending on both sides of the center point 1235, respectively. Figure 8 As shown in the figure, the drill bit 1 for various types of processing can be used. By processing at least one first thinning auxiliary bevel 1233 of different types on the sides of the two thinning cutting edges 123 (such as curved surface, acute angle or obtuse angle, etc.), the waste chips generated when the various types of drill bits 1 use each thinning cutting edge 123 for processing can smoothly enter the main chip groove 1221 and the escape groove 1222 of each chip groove 122 along each first thinning auxiliary bevel 1233, each second thinning auxiliary bevel 1237, etc., and can be quickly discharged outward, so as to improve the processing and cutting ability of the drill bit 1 and the good chip removal function, and also increase the cutting ability of the drill bit 1.

[0035] The above description is only a preferred embodiment of the present utility model, and does not limit the patent scope of the present utility model. Therefore, all simple modifications and equivalent structural changes made by using the contents of the present utility model specification and drawings should be included in the patent scope of the present utility model and are hereby stated.

Claims

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

2. The improved structure of the drill bit according to claim 1, characterized in that: The outer diameter of the blade portion of the drill bit is 0.05 to 0.6 mm.

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

4. The improved structure of the drill bit according to claim 1, characterized in that: The two thinning auxiliary bevels and the two main cutting edges form an acute angle between each of the thinning cutting bevels and the center point, and each of the first thinning angles is an acute angle of inclination of 25° to 70°.

5. The improved structure of the drill bit according to claim 1, characterized in that: The two thinning auxiliary bevels and the two main cutting edges form an acute angle between each thinning cutting bevel and the center point to form a second thinning angle, and each second thinning angle is an acute angle of 5° to 55°.

6. The improved structure of the drill bit according to claim 1, characterized in that: The two thinning cutting edges of the blade portion of the drill bit respectively cross the chiseling lines extending on both sides of the center point, and are then processed to form at least one first thinning auxiliary bevel; or the two thinning cutting edges of the blade portion of the drill bit are the edges of the chiseling lines extending on both sides of the center point, and are respectively processed to form two first thinning auxiliary bevels and two second thinning auxiliary bevels in an acute or obtuse angle.

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