A cutting bit

Abstract

The utility model discloses a cutting drill bit, including drill pipe and cutting head, and cutting head contains main slice and two vice slices. Main slice forms the "I" character cutting edge through the first bevel cutting edge and second bevel cutting edge that gradually contract to top, and the cutting edge is obliquely arranged one end and forms cutting tip, and is equipped with the recess on two bevel cutting edges, two vice slices are located main slice both sides, and are equipped with at least one ladder below the middle part. The "I" character cutting edge and obliquely arranged cutting tip can reduce the contact area in the early stage of cutting, reduce the cutting resistance, improve the cutting efficiency, especially suitable for hard material, the recess can divide the scrap, optimize the performance of the scrap and the ejection, reduce secondary cutting and blade wear, ensure the flatness of the processing surface, the ladder structure of vice slice can disperse load, avoid stress concentration, enhance structural strength, prolong the service life, improve the adaptability of drill bit under complex working conditions.

Description

Technical Field

[0001] This utility model relates to the field of cutting drill bit technology, specifically a cutting drill bit. Background Technology

[0002] In fields such as machining, construction, and geological exploration, cutting drill bits are the core tools for material cutting and drilling operations, and their performance directly affects work efficiency, machining accuracy, and tool life. With the continuous improvement of modern industry's requirements for machining quality and efficiency, and for the cutting needs of different materials (such as metals, concrete, and rocks), existing cutting drill bits have gradually revealed many shortcomings in their structural design.

[0003] In existing technologies, traditional cutting drill bits often employ a single-edge structure or a simple symmetrical edge design. For example, some drill bits have a straight or curved main cutting edge. During cutting, the contact area between the cutting edge and the workpiece is large, leading to increased cutting resistance. This not only reduces cutting efficiency but also makes the cutting edge prone to wear or chipping due to excessive instantaneous impact force, especially when machining hard materials. Furthermore, traditional main cutting edges lack effective chip-breaking structures, causing chips to accumulate near the cutting edge and fail to be removed promptly. This leads to secondary cutting, exacerbating edge wear and affecting the smoothness of the machined surface.

[0004] For drill bits with secondary cutting edges, the existing secondary cutting edge designs are often relatively simple, mostly consisting of continuous, smooth bevels or arcs. In actual operation, the secondary cutting edge mainly serves to assist cutting and enlarge the hole diameter. However, due to the lack of a reasonable load distribution structure, the middle and lower parts of the secondary cutting edge are prone to fatigue damage due to stress concentration during long-term cutting, leading to a shortened overall service life of the drill bit. Furthermore, some secondary cutting edges lack a stepped structure, resulting in uneven distribution of cutting loads at different depths during cutting. This not only affects cutting stability but also increases power consumption, hindering energy conservation and cost reduction.

[0005] In addition, in cutting operations involving complex materials or multi-layered structures, existing cutting drills are unable to meet the cutting needs of different depths and hardness areas, often resulting in insufficient cutting accuracy and excessive wear of the cutting edge in certain areas. This necessitates frequent drill replacements, increasing operating costs and downtime.

[0006] In summary, optimizing the structure of the main and secondary cutting edges of the cutting head to improve cutting efficiency, reduce edge wear, enhance chip removal performance, and improve the adaptability and service life of the drill bit under complex working conditions has become a pressing technical problem to be solved in this field. Utility Model Content

[0007] In view of the shortcomings of the prior art, this utility model provides a cutting drill bit.

[0008] The technical solution adopted by this utility model is: a cutting drill bit, comprising a drill rod and a cutting head, wherein the cutting head comprises:

[0009] The main slice has a "I"-shaped cutting edge formed by a first and a second inclined cutting edge that gradually tapers towards the top. The inclined cut surface of the "I"-shaped cutting edge has a cutting tip at one end, and the first and second inclined cutting edges have notches.

[0010] Two sub-slices are arranged on both sides of the main slice, and at least one step is provided below the middle of the sub-slices.

[0011] Furthermore, there are two steps, and the included angle between the first inclined plane and the second inclined plane is 130-160°, and the included angle of the upper step is smaller than that of the lower step.

[0012] Furthermore, the included angle of 'a' of the upper step is 130-140°, and the included angle of 'a' of the lower step is 145-155°.

[0013] Furthermore, the notch is an arc-shaped notch.

[0014] Furthermore, the first inclined cutting edge and the second inclined cutting edge are asymmetrically arranged, and the angle b between the first inclined cutting edge and the axis is smaller than the angle b between the second inclined cutting edge and the axis.

[0015] Furthermore, the angle between the first inclined cutting edge and the axis b is 15-17°, and the angle between the second inclined cutting edge and the axis b is 17-20°.

[0016] Furthermore, the drill rod is provided with a helical chip removal groove at one end of the cutting head.

[0017] The beneficial effects of this utility model are:

[0018] 1. Improved cutting efficiency and reduced cutting resistance: The main cutting edge uses a "I"-shaped cutting edge formed by a first and second inclined cutting edge, with an angled design forming the cutting tip. This results in a smaller contact area between the cutting edge and the workpiece material in the initial cutting stage, allowing for rapid material entry and effectively reducing cutting resistance. Simultaneously, the angled design of the "I"-shaped cutting edge disperses the cutting force in different directions, reducing instantaneous impact force, making it particularly suitable for cutting hard materials and significantly improving cutting efficiency. 2. Optimized chip breaking and removal performance: The notches on the first and second inclined cutting edges break continuous cutting chips into smaller fragments during the cutting process, preventing chip accumulation near the cutting edge. This chip breaking structure guides chips to be quickly discharged along the inclined surface, reducing secondary cutting phenomena. This not only reduces the wear rate of the cutting edge but also ensures the smoothness of the machined surface, improving machining quality.

[0019] 3. Enhanced structural strength and load distribution capability of the sub-slice: At least one step below the middle of the sub-slice disperses the load borne by the sub-slice during cutting to different step surfaces, preventing stress concentration in a certain area. This stepped structure effectively alleviates fatigue damage in the middle and lower parts of the sub-slice, extending its service life.

[0020] 4. Adapting to Complex Working Conditions and Enhancing Operational Adaptability: The collaborative design of the main slice and the two side sub-slices allows the drill bit to address the cutting needs of different depths and hardness areas when facing complex materials or multi-layered structures. This is achieved through the tip cutting of the main slice and the stepped cutting of the side slices. This not only improves cutting accuracy but also reduces the frequency of drill bit replacement due to excessive local wear, thereby reducing operating costs and downtime.

[0021] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The utility model will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a structural schematic diagram from another perspective of the present invention.

[0024] Figure 3 for Figure 1 Enlarged diagram of point A in the middle.

[0025] Figure 4 for Figure 2 Enlarged diagram of point B in the middle.

[0026] Figures 1-4In the middle: 1. Drill rod; 2. Cutting head; 3. Main slice; 4. First inclined cutting edge; 5. Second inclined cutting edge; 6. "I" shaped cutting edge; 7. Cutting tip; 8. Notch; 9. Secondary slice; 10. Step; 11. Inclined surface one; 12. Inclined surface two; 13. Chip removal groove. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0029] This utility model provides a cutting drill bit.

[0030] In this embodiment, refer to Figures 1-4 The cutting drill bit includes a drill rod 1 and a cutting head 2, wherein the cutting head includes:

[0031] The main slice 3 is formed by a first inclined cutting edge 4 and a second inclined cutting edge 5 that gradually taper towards the top to form a "I"-shaped cutting edge 6. The inclined cutting edge 6 has a cutting tip 7 at one end. The first and second inclined cutting edges are provided with notches 8.

[0032] Two sub-slices 9 are arranged on both sides of the main slice, and at least one step 10 is provided below the middle of the sub-slices.

[0033] In the above technical solution, the cutting head of this cutting drill bit has a main cutting edge as its core, supplemented by secondary cutting edges on both sides. The first and second inclined cutting edges of the main cutting edge taper upwards to form a straight cutting edge. The inclined structure allows the cutting tip to contact the workpiece material first, reducing the initial contact area. The notch can separate chips, and the steps on both sides of the secondary cutting edges can disperse the cutting load. The cutting tip reduces the cutting resistance and improves cutting efficiency; the notch separates chips, avoids chip accumulation, and reduces secondary cutting and edge wear; the steps of the secondary cutting edges disperse stress, enhance structural strength, extend service life, and overall improve the drill bit's adaptability in machining various materials.

[0034] Specifically, there are two steps. The step 10 includes an angle α between inclined plane 11 and inclined plane 2, which is 130-160°. The angle α of the upper step is smaller than that of the lower step.

[0035] In this embodiment, the sub-slice is provided with two steps, each step forming an angle α of 130-160° between inclined plane one and inclined plane two, with the angle of the upper step being smaller than that of the lower step. This design allows different steps to undertake cutting tasks at different depths during cutting, and the difference in angle adapts to the load requirements of different cutting stages.

[0036] Specifically, the included angle 'a' of the upper step is 130-140°, and the included angle 'a' of the lower step is 145-155°.

[0037] In this embodiment, the above angle range makes the upper step sharper and cuts smoother during shallow cutting; the lower step provides greater support and reduces deformation during deep cutting. The angle difference rationally distributes the load, further reducing stress concentration, extending the service life of the sub-slice, and improving cutting stability.

[0038] Specifically, the notch is an arc-shaped notch.

[0039] In this embodiment, the notch on the main slicing cutting edge is set as an arc-shaped notch. The arc-shaped structure is smoother when in contact with the debris, which can guide the debris to be discharged along the arc-shaped surface and avoid debris jamming that may be caused by right-angle or sharp-angled notches.

[0040] Specifically, the first inclined cutting edge and the second inclined cutting edge are asymmetrically arranged, and the angle b between the first inclined cutting edge and the axis is smaller than the angle b between the second inclined cutting edge and the axis.

[0041] In this embodiment, the first and second inclined cutting edges are asymmetrically arranged, and the angle b between the first inclined surface and the axis is smaller than that between the second inclined surface. This asymmetrical structure causes the two cutting edges to contact the material at different times and with different forces during rotary cutting, resulting in differentiated cutting.

[0042] Specifically, the angle between the first inclined cutting edge and the axis b is 15-17°, and the angle between the second inclined cutting edge and the axis b is 17-20°.

[0043] In this embodiment, the angle b between the first inclined plane and the axis is set to 15-17°, and the angle b between the second inclined plane and the axis is set to 17-20°, so that the asymmetrical angle is more in line with the laws of cutting mechanics and can be adapted to the cutting requirements of most materials.

[0044] Specifically, the drill rod is provided with a helical chip removal groove 13 at one end of the cutting head.

[0045] In this embodiment, the helical chip removal groove at the end of the drill rod near the cutting head can rotate with the drill rod, and the centrifugal force and pushing force generated by the helical structure are used to discharge the chips generated by the cutting head along the groove.

[0046] Attention all technical personnel: Although this utility model has been described according to the specific embodiments above, the concept of this utility model is not limited to this utility model. Any modification that utilizes the concept of this utility model will be included within the scope of protection of this patent right.

Claims

1. A cutting drill bit, comprising a drill rod and a cutting head, characterized in that... The cutting head includes: The main slice has a "I"-shaped cutting edge formed by a first and a second inclined cutting edge that gradually tapers towards the top. The inclined cut surface of the "I"-shaped cutting edge has a cutting tip at one end, and the first and second inclined cutting edges have notches. Two sub-slices are arranged on both sides of the main slice, and at least one step is provided below the middle of the sub-slices.

2. The cutting drill bit according to claim 1, characterized in that: The steps consist of two steps, and the included angle between the first inclined plane and the second inclined plane is 130-160°, with the included angle of the upper step being smaller than that of the lower step.

3. The cutting drill bit according to claim 2, characterized in that: The included angle 'a' of the upper step is 130-140°, and the included angle 'a' of the lower step is 145-155°.

4. The cutting drill bit according to claim 1, characterized in that: The notch is an arc-shaped notch.

5. The cutting drill bit according to claim 1, characterized in that: The first inclined cutting edge and the second inclined cutting edge are asymmetrically arranged, and the angle b between the first inclined cutting edge and the axis is smaller than the angle b between the second inclined cutting edge and the axis.

6. The cutting drill bit according to claim 1, characterized in that: The angle between the first inclined cutting edge and the axis of the axis b is 15-17°, and the angle between the second inclined cutting edge and the axis of the axis b is 17-20°.

7. The cutting drill bit according to claim 1, characterized in that: The drill rod has a helical chip removal groove at one end of the cutting head.

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