Cutting head and drill bit

Abstract

The utility model discloses a cutting head and a drill bit, which comprise a main cutting piece, two sides of the front end of the main cutting piece are contracted inwards to form a linear cutting end, and a linear cutting edge is arranged at the top of the cutting end; the two secondary cutting blades are arranged on the two sides of the main cutting blade, and the tops of the two secondary cutting blades are lower than the linear cutting edge. By means of the design, the drill bit can rapidly cut into materials when the linear cutting edge is used for opening holes in the initial stage, and the drilling efficiency is improved; meanwhile, due to the arrangement of the cross-shaped cutting edges, the stress concentration phenomenon in the working process is dispersed, the pressure on a single cutting edge is reduced, the contact area is increased, and therefore the service life of the drill bit is prolonged. In addition, the stability and controllability of the tool are enhanced through uniform cutting force in the four directions, vibration and deviation are reduced, and higher machining precision is guaranteed. The drilling machine is suitable for efficient and high-precision drilling operation of various materials.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bits, in particular to a cutting head connected to the top of the drill bit for cutting and a drill bit comprising the cutting head. Background Art

[0002] With the development of industry and construction, the demand for drilling operations is increasing. In order to meet the needs of different application scenarios, various types of drill bits have appeared on the market, among which the most common are slotted drill bits (flat head drills) and cross drill bits (Phillips heads). These two types have their own characteristics:

[0003] Slotted drill bits: Usually consist of a central shaft (i.e. drill rod) and two straight-line cutting edges on either side of the top of the drill rod. Its main advantage is that it can quickly cut into the material surface, thus achieving a high drilling speed. However, since most of the pressure during the entire drilling process is concentrated on the narrow slotted cutting edge, this type of drill bit is prone to wear, so their service life is relatively short.

[0004] Cross drill bit: In contrast, the cross drill bit is characterized by four cutting edges arranged in a "cross" shape at the top of the drill rod. Although this design sacrifices a certain degree of drilling speed, it is more durable than a slotted drill bit because the force is more evenly distributed in four directions, and it can complete more work without so frequent replacement.

[0005] Although the above two relatively mature solutions already exist in the existing technology, it is still difficult to achieve high efficiency and long life at the same time in practical applications. In view of this, the development of a new type of drill bit that can maintain high drilling performance and significantly improve durability has become an important issue in the industry.

[0006] This application is an innovative design proposed based on the above considerations. By comprehensively improving the structure of traditional slotted and cross drill bits, the shortcomings of a single type of drill bit are overcome, providing users with an ideal choice that combines excellent work efficiency and long service life. Utility Model Content

[0007] In view of the deficiencies in the background technology, the utility model provides a cutting head.

[0008] The technical solution adopted by the utility model is: a cutting head, comprising:

[0009] A main slice, wherein the front ends of the main slice are contracted inwardly to form an I-shaped cutting end, the top of the I-shaped cutting end is provided with an I-shaped cutting edge, and the two sides of the main slice are provided with a main cutting edge 1 and a main cutting edge 2, wherein the main cutting edge 1 is arranged higher than the main cutting edge 2;

[0010] Two sub-slices, the two sub-slices are arranged on both sides of the main slice, and the top of the sub-slice is arranged lower than the "I"-shaped cutting edge, and the tops of the two sub-slices have a secondary cutting edge 1 and a secondary cutting edge 2 arranged obliquely, and the secondary cutting edge 1 is arranged higher than the secondary cutting edge 2;

[0011] The secondary slices and the primary slices are arranged in a cross shape.

[0012] Furthermore, the four side surfaces of the “I”-shaped cutting end have cut surfaces inclined toward the inner side of the top, and the tops of the multiple cut surfaces form the above-mentioned “I”-shaped cutting edge.

[0013] Furthermore, main cutting edges are arranged on both sides of the main slice, and the main cutting edges include a main oblique edge and a main vertical edge at the top. The main vertical edges are symmetrically arranged on both sides of the secondary slice, and the inclinations of the main oblique edges on both sides of the secondary slice are arranged non-uniformly.

[0014] Furthermore, a secondary cutting edge is arranged on the side of the secondary slice away from the main slice, and the secondary cutting edge includes a secondary bevel edge and a secondary vertical edge at the top, and the secondary vertical edges are symmetrically arranged on both sides of the main slice, and the inclinations of the secondary bevel edges on both sides of the main slice are arranged inconsistently.

[0015] Furthermore, the inclination of the main bevel edge on one side is 2-8° greater than the inclination of the main bevel edge on the other side.

[0016] Furthermore, the slope of the minor cutting edge on one side is 2-8° greater than the slope of the minor cutting edge on the other side.

[0017] Furthermore, main cutting edge three and main cutting edge four are formed between the main oblique cutting edges and the main vertical cutting edges on both sides of the main slice, and secondary cutting edge three and secondary cutting edge four are formed between the secondary oblique cutting edges and the secondary vertical cutting edges on both sides of the secondary slice. The difference between the top of main cutting edge three and the top of the main slice is 45%-55% of the total length of the main slice, the difference between the top of main cutting edge two and the top of the main slice is 65%-70% of the total length of the main slice, the difference between the top of secondary cutting edge three and the top of the main slice is 50%-60% of the total length of the main slice, and the difference between the top of secondary cutting edge four and the top of the main slice is 70%-75% of the total length of the main slice.

[0018] Furthermore, the difference between the top of the main cutting edge 1 and the top of the main slice is 3%-7% of the total length of the main slice, the difference between the top of the main cutting edge 2 and the top of the main slice is 8%-15% of the total length of the main slice, the difference between the top of the secondary cutting edge 1 and the top of the main slice is 15%-20% of the total length of the main slice, and the difference between the top of the secondary cutting edge 2 and the top of the main slice is 20%-25% of the total length of the main slice.

[0019] Furthermore, the inclination angle of the cutting surface is 5-10°, and the inclination angles of the main cutting edge and the secondary cutting edge are both 10-15°.

[0020] The present application also provides a drill bit, comprising the above-mentioned cutting head and a drill rod connected to the cutting head.

[0021] The beneficial effects of the utility model are:

[0022] 1. Improve drilling efficiency: The two sides of the front end of the main slice shrink inward to form a "slotted" cutting end, and the design of the "slotted" cutting edge on the top enables rapid cutting into the material during the initial hole opening, similar to the advantages of traditional slotted drill bits. This helps to shorten the initial penetration time and improve overall work efficiency.

[0023] 2. Extend service life: Two secondary slices are set on both sides of the main slice and lower than the "I" cutting edge, forming a stable cross-shaped cutting structure. This layout not only disperses the stress concentration phenomenon during the working process and reduces the pressure on a single cutting edge, but also increases the contact area and reduces the wear rate, thereby effectively extending the overall service life of the drill bit.

[0024] 3. Improve cutting stability: Due to the cross-shaped cutting edge configuration, the cutting forces in four directions are more evenly distributed during subsequent hole expansion operations, which enhances the stability and controllability of the tool, reduces vibration and offset, and ensures higher processing accuracy.

[0025] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the utility model.

[0027] Figure 2 It is a side schematic diagram of the utility model.

[0028] Figure 3 It is a schematic diagram of the other side of the utility model.

[0029] Figure 4 Schematic diagram of the drill bit

[0030] Figure 1-4In: 1. Main slice; 2. “I” cutting end; 3. “I” cutting edge; 4. Secondary slice; 5. Cutting surface; 6. Main cutting edge; 7. Main bevel edge; 8. Main vertical edge; 9. Secondary cutting edge; 10. Secondary bevel edge; 11. Secondary vertical edge; 12. Cutting head; 13. Drill rod; 14. Main cutting edge one; 15. Main cutting edge two; 16. Secondary cutting edge one; 17. Secondary cutting edge two; 18. Main cutting edge three; 19. Main cutting edge four; 20. Secondary cutting edge three; 21. Secondary cutting edge four. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] The utility model provides a cutting head.

[0034] In this embodiment, refer to Figure 1-4 The cutting head comprises:

[0035] A main slice 1, wherein the front ends of the main slice 1 are contracted inwardly to form an I-shaped cutting end 2, the top of the I-shaped cutting end 2 is provided with an I-shaped cutting edge 3, and the two sides of the main slice are provided with a main cutting edge 14 and a main cutting edge 2 15, wherein the main cutting edge 1 is arranged higher than the main cutting edge 2;

[0036] Two sub-slices 4, the two sub-slices 4 are arranged on both sides of the main slice, and the top of the sub-slice 4 is arranged lower than the "I"-shaped cutting edge, and the tops of the two sub-slices have an inclined sub-edge 16 and a sub-edge 2 17, and the sub-edge 1 is arranged higher than the sub-edge 2;

[0037] The secondary slices and the primary slices are arranged in a cross shape.

[0038] The cutting head of the present application includes a main slice and a secondary slice. The front end of the main slice has a "straight" cutting end and a "straight" cutting edge. Therefore, the straight cutting edge is used to make holes in the initial cutting and the front end of drilling, so that the drill bit can quickly cut into the material surface when drilling, thereby improving the initial drilling efficiency. As the cutting extends, the main slice with a cross at the rear end and the cross cutting edge formed by the secondary slice participate in the drilling, forming a process from straight hole opening to cross hole expansion, thereby ensuring the drilling efficiency while helping to extend the service life of the drill bit.

[0039] In addition, the main cutting edge 1 and the main cutting edge 2 are set one high and one low, and the secondary cutting edge 1 and the secondary cutting edge 2 are also set one high and one low. When tilted, during the drilling process, the main cutting edge 1 will also be cut first, and gradually transition to the two-edge, three-edge and four-edge cutting process. The cutting transition is smooth, which helps to improve the stability, reliability, efficiency of the cutting process and the durability of the drill bit, and is more conducive to chip removal of the drill bit.

[0040] Specifically, the four side surfaces of the “I”-shaped cutting end 2 have cut surfaces 5 inclined toward the inner side of the top, and the tops of the multiple cut surfaces form the “I”-shaped cutting edge 3 mentioned above.

[0041] In this embodiment, the four side surfaces of the "I" cutting end are designed to be cut surfaces inclined toward the inner side of the top, and these cut surfaces converge at the top to form an "I" cutting edge. Such a design can optimize the cutting performance by changing the angle of the cut surface.

[0042] Specifically, main cutting edges 6 are arranged on both sides of the main slice, and the main cutting edges 6 include a main bevel edge 7 and a main vertical edge 8 at the top. The main vertical edges 8 are symmetrically arranged on both sides of the secondary slice, and the inclinations of the main bevel edges on both sides of the secondary slice are not uniformly arranged.

[0043] In this embodiment, if Figure 2 As shown in the figure, main cutting edges are set on both sides of the main slice, including the main bevel edge and the main vertical edge on the top. The main vertical edges are symmetrically distributed on both sides of the secondary slice, while the main bevel edges on both sides of the secondary slice are set with different inclinations. The main bevel edges with different inclinations can provide a more balanced cutting force distribution during drilling, reduce vibration and improve stability. In addition, the non-uniform inclination also helps to better control the chip flow direction, further improving cutting efficiency and chip evacuation.

[0044] At the same time, since the main bevel edges on both sides are set with non-uniform inclinations, the main bevel edges that are more inclined to the outside will have limited cutting during cutting. As the cutting progresses, there will be a smooth transition from one-edge cutting to two-edge cutting, which enhances the continuity and uniformity of the drilling process.

[0045] Specifically, a secondary cutting edge 9 is provided on the side of the secondary slice 4 away from the main slice, and the secondary cutting edge 9 includes a secondary bevel edge 10 and a secondary vertical edge 11 at the top. The secondary vertical edges are symmetrically arranged on both sides of the main slice, and the inclinations of the secondary bevel edges on both sides of the main slice are not uniformly arranged.

[0046] In this embodiment, if Figure 3 As shown, in this structure, the inclination of the non-uniform secondary bevel edge is similar to the effect of the non-uniform inclination setting of the main bevel edge mentioned above. The combination of the two realizes a smooth transition from single-edge cutting to multi-edge (four-edge) cutting during the drilling process, enhances the continuity and uniformity of the drilling process, and improves the overall work efficiency.

[0047] Specifically, the slope of the main bevel edge on one side is 2-8° greater than the slope of the main bevel edge on the other side; the slope of the secondary cutting edge on one side is 2-8° greater than the slope of the secondary cutting edge on the other side.

[0048] In this embodiment, different slope differences are selected according to actual working conditions to improve the cutting effect. Specifically, the slope difference of the primary bevel edge can be 5°, and the slope difference of the secondary bevel edge can be 5°. Such slope differences help the drill bit maintain good self-centering ability when operating on materials of different hardness or unevenness, and avoid deviation caused by changes in material properties.

[0049] Specifically, a main cutting edge three 18 and a main cutting edge four 19 are formed between the main oblique cutting edges and the main vertical cutting edges on both sides of the main slice, a secondary cutting edge three 20 and a secondary cutting edge four 21 are formed between the secondary oblique cutting edges and the secondary vertical cutting edges on both sides of the secondary slice, the difference between the top of the main cutting edge three and the top of the main slice is 45%-55% of the total length of the main slice, the difference between the top of the main cutting edge two and the top of the main slice is 65%-70% of the total length of the main slice, the difference between the top of the secondary cutting edge three and the top of the main slice is 50%-60% of the total length of the main slice, and the difference between the top of the secondary cutting edge four and the top of the main slice is 70%-75% of the total length of the main slice.

[0050] By setting cutting edges of different heights (main cutting edge three, main cutting edge four, secondary cutting edge three, secondary cutting edge four) on the main slice and secondary slice, the main cutting edge three, secondary cutting edge three, main cutting edge four and secondary cutting edge four are successively increased to form a continuous spiral cutting path, so that the drill bit can gradually penetrate the material during the drilling process and achieve multi-stage cutting. This not only improves the cutting efficiency, but also reduces the burden of a single cutting edge and prolongs the service life. The cutting edge design of different heights enables the drill bit to disperse stress more evenly when working, reduces the possibility of local overload, and thus reduces the tool wear rate. The multi-level cutting edge design helps to better control the chip flow, reduce the risk of chip blockage, and further improve the stability and controllability of the cutting process. Cutting edges of different heights can provide better guidance, especially in the early stage of entering the material, which helps the drill bit maintain good self-centering ability and ensure the accuracy and consistency of the hole position.

[0051] Specifically, the difference between the top of the main cutting edge 1 and the top of the main slice is 3%-7% of the total length of the main slice, the difference between the top of the main cutting edge 2 and the top of the main slice is 8%-15% of the total length of the main slice, the difference between the top of the secondary cutting edge 1 and the top of the main slice is 15%-20% of the total length of the main slice, and the difference between the top of the secondary cutting edge 2 and the top of the main slice is 20%-25% of the total length of the main slice.

[0052] Similarly, the top of the cutting head is also provided with main cutting edge 1, main cutting edge 2, secondary cutting edge 1 and secondary cutting edge 2 with gradually increasing heights, so that the drill bit can gradually penetrate into the material during the drilling process, which has the following effects:

[0053] Fast cutting: The height of the main cutting edge is set very close to the top of the main slice (3%-7%), so that it can quickly cut into the material at the beginning of drilling, improving the initial drilling efficiency.

[0054] Progressive cutting: As the drilling depth increases, the main cutting edge 1 transitions to the main cutting edge 2, then to the secondary cutting edge 1 and the secondary cutting edge 2, forming a progressive cutting process. This design ensures that the cutting force increases gradually, reduces the pressure on a single cutting edge, and prolongs the service life.

[0055] Reduce vibration: Due to the reasonable distribution of the height difference between the cutting edges, the drill bit can advance more smoothly during the cutting process, reducing vibration and improving processing accuracy.

[0056] Improve chip evacuation: Cutting edges of different heights help form a good chip evacuation channel, prevent chip accumulation, and ensure smoothness during the drilling process.

[0057] Adapt to a variety of materials: This multi-level cutting edge design enables the drill to better adapt to materials of different hardness and characteristics, improving its versatility and scope of application.

[0058] Specifically, the inclination angle of the cutting surface is 5-10°, and the inclination angles of the main cutting edge and the secondary cutting edge are both 10-15°.

[0059] The design of the cutting surface inclination angle (5-10°) helps to reduce the contact area between the drill bit and the material, thereby reducing friction. This makes the drill bit cut into the material more smoothly and increases the drilling speed. The inclination of the main cutting edge and the secondary cutting edge is set to 10-15°. This angle can not only ensure sufficient cutting force, but also effectively reduce cutting resistance, further improving cutting efficiency.

[0060] The present application also provides a drill bit, comprising the above-mentioned cutting head 12 and a drill rod 13 connected to the cutting head.

[0061] The drill bit is composed of a cutting head with the above-described features and a drill rod connected thereto. The drill rod is usually made of the same or compatible high-strength material as the cutting head and can be fixed together by welding, threaded connection, integral molding or other reliable methods.

[0062] Technical personnel should note: Although the utility model has been described according to the above specific implementation methods, the concept of the utility model is not limited to this utility model. Any modification using the concept of the utility model will be included in the scope of protection of this patent right.

Claims

1. A cutting head, characterized in that include: A main slice, wherein the front ends of the main slice are contracted inwardly to form an "I"-shaped cutting end, the top of the "I"-shaped cutting end is provided with an "I"-shaped cutting edge, and the two sides of the main slice are provided with a main cutting edge 1 and a main cutting edge 2, wherein the main cutting edge 1 is arranged higher than the main cutting edge 2; Two sub-slices, the two sub-slices are arranged on both sides of the main slice, and the top of the sub-slice is arranged lower than the "I"-shaped cutting edge, and the tops of the two sub-slices have an inclined sub-edge 1 and a sub-edge 2, and the sub-edge 1 is arranged higher than the sub-edge 2; The secondary slices and the primary slices are arranged in a cross shape.

2. The cutting head according to claim 1, characterized in that: The four side surfaces of the "I"-shaped cutting end have cut surfaces inclined toward the inner side of the top, and the tops of the multiple cut surfaces form the above-mentioned "I"-shaped cutting edge.

3. The cutting head according to claim 2, characterized in that: Main cutting edges are arranged on both sides of the main slice, and the main cutting edges include a main oblique edge and a main vertical edge at the top. The main vertical edges are symmetrically arranged on both sides of the secondary slice, and the inclinations of the main oblique edges on both sides of the secondary slice are arranged non-uniformly.

4. The cutting head according to claim 3, characterized in that: A secondary cutting edge is arranged on one side of the secondary slice away from the main slice, and the secondary cutting edge includes a secondary bevel edge and a secondary vertical edge at the top. The secondary vertical edges are symmetrically arranged on both sides of the main slice, and the inclinations of the secondary bevel edges on both sides of the main slice are arranged inconsistently.

5. The cutting head according to claim 4, characterized in that: The inclination of the main bevel edge on one side is 2-8° greater than the inclination of the main bevel edge on the other side.

6. The cutting head according to claim 4, characterized in that: The inclination of the minor cutting edge on one side is 2-8° greater than the inclination of the minor cutting edge on the other side.

7. The cutting head according to claim 4, characterized in that: Main cutting edge three and main cutting edge four are formed between the main oblique cutting edges and the main vertical cutting edges on both sides of the main slice, and secondary cutting edge three and secondary cutting edge four are formed between the secondary oblique cutting edges and the secondary vertical cutting edges on both sides of the secondary slice. The difference between the top of main cutting edge three and the top of the main slice is 45%-55% of the total length of the main slice, the difference between the top of main cutting edge two and the top of the main slice is 65%-70% of the total length of the main slice, the difference between the top of secondary cutting edge three and the top of the main slice is 50%-60% of the total length of the main slice, and the difference between the top of secondary cutting edge four and the top of the main slice is 70%-75% of the total length of the main slice.

8. The cutting head according to claim 1, characterized in that: The difference between the top of the main cutting edge 1 and the top of the main slice is 3%-7% of the total length of the main slice, the difference between the top of the main cutting edge 2 and the top of the main slice is 8%-15% of the total length of the main slice, the difference between the top of the secondary cutting edge 1 and the top of the main slice is 15%-20% of the total length of the main slice, and the difference between the top of the secondary cutting edge 2 and the top of the main slice is 20%-25% of the total length of the main slice.

9. The cutting head according to claim 4, characterized in that: The inclination angle of the cutting surface is 5-10°, and the inclination angles of the main cutting edge and the secondary cutting edge are both 10-15°.

10. A drill bit, characterized in that: The invention comprises the cutting head as described in any one of claims 1 to 6 and a drill rod connected to the cutting head.

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