Drill structure

Abstract

To provide a drill structure that improves cutting ability. [Solution] The drill 1 includes a handle portion and a cutting portion 12, the handle portion having a cutting portion formed on one side, the outer diameter of the handle portion being 1.9 to 3.3 mm, the cutting portion including a cutting segment 121 and a chip discharge groove 122 extending circumferentially from the cutting segment toward the handle portion, the cutting segment including two main cutting edges 124, a first cutting surface 1231 and a second cutting surface 1232 extending obliquely from the side of the main cutting edges toward the chip discharge groove, a thin cutting edge 123, and at least one thin cutting auxiliary slope 1233, and the two main cutting edges, the thin cutting edge, and the thin cutting auxiliary slope each have a thin cutting slope 1234 inclined at an acute angle from the center point toward the two main cutting edges.

Description

[Technical field]

[0001] The present invention provides an improvement to the drill structure to expand the cutting range and improve the processing ability of the drill, by adding two thin cutting edges and thin cutting slopes with acute inclinations on their sides, the length of the original main cutting edge is extended, the thickness of the central core of the drill is increased, and the cutting ability of the drill is improved. [Background technology]

[0002] In mechanical processing, the drilling process is a very important process. Many workpieces undergo the drilling process during the processing to form the required holes in the workpieces, which can then be used for subsequent processing processes. In this case, the drill is a necessary tool, which is used to drill various holes in the workpieces. In the drill processing, a spiral cutting blade is mainly applied on the side of the drill, and a cutting end located at one end of the cutting blade is mainly applied, which is an important structure of the drill and affects the smoothness of the processing. In addition, according to the size of the outer diameter of the drill, the thickness of the core also has different changes, which can drill holes of various sizes in the workpieces. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3180456 Summary of the Invention [Problem to be solved by the invention]

[0004] In this invention, during machining, the cutting edge of the cutting edge contacts the workpiece to perform machining, and the cutting edge has an inclined chip surface that extends to the outer spiral chip groove and is discharged to the outside. However, referring to Figures 9 to 11, since the cutting edge A1 of the drill A is close to the center position, the core thickness AH is small, and the core thickness AH is about 30% to 40% of the diameter (mm) of the drill A.

[0005] In the above structure, the cutting blade A1 is not strong enough and breaks easily, and since there is no appropriate interval or angle between the cutting blade A1 and each adjacent chip groove A2, the waste material generated after the cutting blade A1 cuts the workpiece is difficult to separate and accumulates in the chip groove A2 and is pushed out, which makes the cutting process of the drill A less smooth, and the friction of the waste material in the chip groove A2 can scratch the wall of the hole, reducing the quality of the cutting process. In addition, the waste material is pushed out by the chip groove A2, which increases the possibility of the drill A breaking during cutting, and these problems affect the structural strength of the drill and the smoothness of the hole drilling process. Therefore, improving the smoothness and stability of chip removal during drill cutting operations, and solving the problem and inconvenience of chip material easily accumulating in the chip removal groove of the drill, which has a detrimental effect on both the drill and the workpiece, are important issues that need improvement in this field. [Means for solving the problem]

[0006] The object of the present invention is to provide a drill having a cutting portion molded on one side of a handle, the cutting portion including a cutting segment and a chip discharge groove extending from the cutting segment towards the handle, the cutting segment including two main cutting edges, a first cutting surface and a second cutting surface extending obliquely at different angles on each side, two thinning edges, a thinning cutting slope inclined at an acute angle on the sides of the two thinning edges, and at least one auxiliary thinning slope, thereby increasing the core thickness in the centre of the drill and improving the cutting ability of the main cutting edges.

[0007] A further object of the present invention is to improve the cutting ability of the drill by increasing the number of thin cutting edges, and a good example of the outer diameter dimension of the drill bit can be 0.05 to 0.6 millimeters (mm), and the thickness of the central core of the drill bit (12H, millimeters, mm) can be approximately 40% to 70% of the diameter of the bit (12OD, millimeters, mm), resulting in a good outer diameter dimension of the handle.

[0008] For the above purpose, the first hitting angle (θ1) can be set to an acute inclination angle of 25 degrees to 70 degrees.

[0009] For the above purpose, the second hitting angle (θ2) formed shows an acute inclination angle of 5 degrees to 55 degrees.

[0010] For the above purpose, two cutting edges of the drill bit are machined to form at least one first auxiliary bevel beyond each cutting line extending on both sides of the center point, and the two cutting edges of the drill bit can form a first auxiliary bevel and a second auxiliary bevel that are machined to form acute angles along the ends of each cutting line extending on both sides of the center point. Effect of the Invention

[0011] In the present invention, the drill has a cutting portion molded on one side of the handle, the cutting portion including a cutting segment and a chip discharge groove extending from the cutting segment toward the handle, the cutting segment including two main cutting edges, a first cutting surface and a second cutting surface extending at different angles on each side, two thinning edges, a thinning cutting slope inclined at an acute angle on the sides of the two thinning edges, and at least one auxiliary thinning slope, which can increase the core thickness in the center of the drill and improve the cutting ability of the main cutting edges. [Brief description of the drawings]

[0012] [Figure 1] 3D appearance diagram of the present invention; [Diagram 2] FIG. 2 is a front view of the drill bit of the present invention; [Diagram 3] A partially enlarged side view of the cutting edge of the left drill of the present invention (1); [Figure 4] (2) A partially enlarged side view of the cutting edge of the drill of the present invention; [Diagram 5] FIG. 2 is a side cross-sectional view of the cutting edge of the drill of the present invention; [Figure 6] FIG. 2 is a front view of the first embodiment of the drill bit of the present invention; [Figure 7] FIG. 2 is a front view of a drill bit according to a second embodiment of the present invention; [Figure 8]FIG. 3 is a front view of the third embodiment of the drill bit of the present invention; [Figure 9] FIG. 2 is a front view of a conventional drill bit according to the present invention; [Figure 10] FIG. 2 is a partially enlarged side view of a cutting edge of a conventional drill according to the present invention; [Figure 11] FIG. 2 is a side cross-sectional view of a conventional drill bit according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] In order to achieve the objectives and effects of the present invention, the technical means adopted by the present invention, its structure, implementation method, etc., the features and functions of the preferred embodiment of the present invention are described in detail as follows, with reference to Figures 1 to 5. The structural improvement of the drill according to the present invention is a drill 1 including a handle portion 11 and a cutting portion 12, specifically: the handle portion 11 of the drill 1 extends from one side to form a cutting portion 12, the optimal embodiment of the outer diameter (diameter 12OD, see also Figures 2 and 5) of the cutting portion 12 is 0.05 to 0.6 mm, and the optimal embodiment of the outer diameter 11L of the handle portion 11 (see also Figure 1) is 1.9 to 3.3 mm.

[0014] The blade portion 12 includes a cutting segment 121 and a chip discharge groove 122 extending circumferentially from the cutting segment 121 toward the handle portion 11. The cutting segment 121 includes a main cutting edge 124, a first cutting surface 1231 and a second cutting surface 1232 extending obliquely at different angles from a side of the main cutting edge 124, two scraping edges 123, and at least one first scraping auxiliary oblique edge inclined at an acute angle from a side of the two scraping edges 123. Each of the first cutting edge surfaces 1231, each of the second cutting edge surfaces 1232, each of the two scraping blades 123, and each of the first scraping auxiliary inclined surfaces 1233 extend obliquely to the debris discharge groove 122, and a scraping inclined surface 1234 is provided between each of the two scraping auxiliary inclined surfaces 1233 and the two scraping blades 123, and each of the scraping inclined surfaces 1234 forms an acute first scraping angle (θ1) with a center point 1235.

[0015] The above-mentioned blade portion 12 has a central core thickness 12H of the blade portion 12 formed by the first blade surface 1231, the second blade surface 1232, and the two auxiliary thin-cutting slopes 1233 on both sides of the two thin-cutting blades 123, which accounts for approximately 40% to 70% of the diameter 12OD (mm) of the blade portion 12. As a result, the structural strength of the blade portion 12 is improved, the cutting effect of the two thin-cutting blades 123 is improved, the central core thickness 12H of the blade portion 12 is increased, and the cutting ability is improved, which may be applied to drilling and cutting thin or soft plate materials (PCB, copper plate, aluminum plate, lead plate, etc.).

[0016] Furthermore, the two thinning auxiliary inclined surfaces 1233 of the blade portion 12 form respective thinning inclined surfaces 1234 inclined at an acute angle between the two thinning blades 123, and the first thinning angle (θ1) inclined at an acute angle of 25° to 70° is formed between each thinning inclined surface 1234 and the center point 1235, as shown in FIG. 4 (4-a is a front view of the blade portion 12, and 4-b is a side view of the blade portion 12). In addition, the second thinning angle (θ2) is formed between the center point 1235 and the horizontal line in the axial direction, as shown in FIG. 3 (3-a is a front view of the blade portion 12 from another viewpoint, and 3-b is a side view of the blade portion 12 from another viewpoint). This improves the effect of waste chips discharged during the drilling and cutting process by the two thinning blades 123, and the waste chips can be guided to the waste chip discharge groove 122 and discharged.

[0017] Furthermore, the two thin scraping edges 123 of the cutting portion 12 are provided with a main scrap groove 1221 on the inside, which extends spirally on each side of the scrap groove 122 and reaches the handle portion 11, and on the outside of each adjacent main scrap groove 1221, there are clearance grooves 1222 of reduced width. As is clear from Figures 1 to 8, the structural improvement of the drill according to the embodiment of the present invention can be seen, and the optimal embodiment of the outer diameter (diameter) of this drill 1 is 0.05 to 0.6 millimeters (mm).

[0018] In addition, the two thin cutting edges 123 of the cutting portion 12 of the drill 1 are individually machined by the first thinning auxiliary slope 1233 (the two thin cutting edges 123 approach each cutting line 1236, see FIG. 6) formed along the ends of each cutting line 1236 along both sides of the center point 1235, and the two thin cutting edges 123 of the cutting portion 12 of the drill 1 are individually machined beyond each cutting line 1236 along both sides of the center point 1235. , at least one first thinning auxiliary bevel 1233 (see also Figures 6 and 7), and the two thinning cutting edges 123 of the cutting portion 12 of the drill 1 are individually machined with acute-angled (or obtuse-angled, etc.) first thinning auxiliary bevel 1233 and second thinning auxiliary bevel 1237 (the two thinning cutting edges 123 approach each cutting line 1236, see also Figure 8) along the ends of each cutting line 1236 along both sides of the center point 1235. This allows the drill 1 to be applied to various different machining types, and allows the machining (curved, acute, obtuse, etc.) of at least one first auxiliary tapping slope 1233 by different shapes of the side of the two tapping blades 123. This allows the waste material generated by using each tapping blade 123 to be smoothly introduced into the main chip discharge groove 1221, the escape groove 1222, etc. along each first auxiliary tapping slope 1233 and each second auxiliary tapping slope 1237, etc., and quickly discharged, improving the machining cutting ability and chip discharge function of the drill 1, and increasing the cutting ability of the drill 1.

[0019] The above is only the best embodiment of the present invention, and does not limit the scope of the utility model registration claims of the present invention. Simple modifications and equivalent structural changes made based on the contents of the description and drawings of the present invention should be included in the scope of the utility model registration claims of the present invention. The drill structure of this invention achieves its effects and objectives in actual use, so this invention is a practical and excellent invention and meets the application requirements. [Explanation of symbols]

[0020] 1: Drill 11: Handle section 11L: Handle outer diameter 12: Blade part 121: Cutting segment 122: Waste drain groove 1221: Main waste discharge groove 1222: Escape groove 123: Thin shaving blade 1231: 1st blade surface 1232: 2nd blade surface 1233: First thin cutting auxiliary slope 1234: Thinly shaved slope 1235: Center point 1236: Scraping line 1237: 2nd thin cutting auxiliary slope 124: Main cutting blade 12H: Thickness of the center core 12OD: Diameter θ1: First cutting angle θ2: Second cutting angle A: Drill A1: Cutting blade A2: Waste drain groove AH: Core thickness AOD: Diameter

Claims

1. a cutting edge formed on one side of the cutting edge, the cutting edge having an outer diameter of 1.9 to 3.3 millimeters (mm); the cutting edge having a cutting segment and a chip discharge groove extending circumferentially from the cutting segment toward the cutting edge, the cutting segment having two main cutting edges, a first cutting surface and a second cutting surface extending obliquely from the side surfaces of the two main cutting edges toward the chip discharge groove, a thinning edge, and at least one auxiliary thinning bevel, the two main cutting edges, the thinning edge, and the auxiliary thinning bevel each having a thinning bevel inclined at an acute angle from a center point toward the two main cutting edges, the outer diameter of the cutting edge being 0.05 to 0.6 millimeters (mm); the cutting edge has a chipping line, both sides of which extend to the two main cutting edges, respectively, bringing the two thinning edges close to the chipping line.

2. A drill structure comprising a handle portion and a cutting portion, the handle portion forming the cutting portion on one side, the handle portion having an outer diameter of 1.9 to 3.3 millimeters (mm), the cutting portion including a cutting segment and a chip discharge groove extending circumferentially from the cutting segment towards the handle portion, the cutting segment including two main cutting blades, a first cutting surface and a second cutting surface extending obliquely from the side surfaces of the two main cutting blades towards the chip discharge groove, a thin cutting blade, and at least one auxiliary thin cutting slope, the two main cutting blades, the thin cutting blade, and the auxiliary thin cutting slope each having a thin cutting slope inclined at an acute angle from a center point towards the two main cutting blades, the outer diameter of the cutting portion being 0.05 to 0.6 millimeters (mm), the cutting portion having cutting lines, one end side of each of the main cutting blades being connected to one end of each of the thin cutting blades and one end of the cutting line.

3. The structure of a drill as described in claim 1, wherein the thickness of the central core of the cutting portion formed by the first cutting surface, the second cutting surface, and the thin-cutting auxiliary slope on the side of the two main cutting edges of the cutting portion accounts for 40% to 70% of the diameter (mm) of the cutting portion.

4. A drill structure as described in claim 1, wherein a first cutting angle (θ1) is formed between the auxiliary cutting surface and the two main cutting edges, at which the center point and each cutting surface are inclined at an acute angle, and each first cutting angle (θ1) has an acute inclination angle of 25 degrees to 70 degrees.

5. A drill structure as described in claim 1, wherein between the auxiliary thin cutting inclined surface and the two main cutting edges, the center point and each thin cutting inclined surface form an inclination angle of a second thin cutting angle (θ2), and each second thin cutting angle (θ2) has an acute inclination angle of 5 degrees to 55 degrees.

6. A drill structure as described in claim 1, wherein the cutting edge portion forms a first thin cutting auxiliary slope and a second thin cutting auxiliary slope, each having an acute angle.

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