Drill bit structure with combined cutting edges

Abstract

The utility model discloses a drill bit structure with a combined blade, which comprises a drill handle, a drill rod and a drill bit, a spiral chip groove is arranged on the drill rod, and a drill blade groove is arranged on the end face of the drill bit. The middle of the bottom wall of the drill lip groove is a protruding part, and the end edge of the drill lip groove is an inclined groove part inclining downwards from the protruding part. A blade structure is arranged at the end of the drill bit, the middle of the bottom face of the blade structure is a concave part, and the edge of the bottom face of the blade structure is an inclined protruding part. The blade structure is installed in the drill blade groove, the protruding part is attached to the concave part, and the inclined protruding part and the inclined groove part are attached and fixed in a welded mode. The drill bit is reasonable in structural arrangement, beneficial for increasing the connecting area of the drill bit and the groove wall, improving the strength and the toughness of the whole structure, beneficial for increasing the torsion of the drill bit, not prone to damage or head flat breakage in the using process, beneficial for improving the effectiveness and the efficiency of chip guiding, and capable of increasing the supporting force of the cutting edge structure through the thick side of the groove wall. And the torsion can be increased during drilling.

Description

Technical Field

[0001] This utility model belongs to the field of drill bit technology, specifically relating to a drill bit structure with combined cutting edges. Background Technology

[0002] A drill bit is a common drilling device, which typically includes a cutter body and a clamping part. The cutter body is equipped with a spiral chip removal groove. In practical applications, to improve drilling efficiency, multiple cutting edges are often provided at the front end of the cutter body. The number of cutting edges can be customized as needed, such as straight cutting edges or cross-shaped cutting edges. To reduce processing difficulty and save costs, the drill rod and cutting edges are sometimes separated. For example, Chinese patent application number 202123437849.X, entitled "A Three-Flute Drill Bit," includes a cutter body at the front end and a clamping part at the rear end. The cutter body includes a spiral section, a head integrally formed at the front end of the spiral section, and three protruding cutting edges integrally formed at the front end of the head. The three cutting edges are circumferentially symmetrically arranged along the axis of the cutter body, and the cutting edges are flat in shape, with their tips inclined radially along the cutter body.

[0003] While it can meet general usage needs, the drill bit has a groove on its end face, and the groove is flat. The cutting edge with a flat bottom is then installed and welded on. This limits its toughness and strength during drilling, and it is also not conducive to chip removal. The head is prone to breakage or damage, which will affect drilling efficiency and, to some extent, its stability during use. Utility Model Content

[0004] The purpose of this invention is to provide a drill bit structure with a combined cutting edge that has a reasonable structural design and is conducive to improving the stability of use.

[0005] The technical solution to achieve the purpose of this utility model is a drill bit structure with combined cutting edges, including a drill shank, a drill rod integrally formed on the drill shank, and a drill bit integrally formed on the drill shank. The drill rod is provided with a spiral chip removal groove, and the end face of the drill bit is provided with a drill cutting edge groove.

[0006] The bottom wall of the drill bit groove is a raised part in the middle, and the end edge of the drill bit groove is an inclined groove that slopes downward from the raised part.

[0007] The drill bit has a cutting edge structure at its end. The bottom surface of the cutting edge structure has a recessed part in the middle that matches the protrusion, and the bottom edge of the cutting edge structure has an inclined protrusion that matches the inclined groove.

[0008] The cutting edge structure is installed in the drill bit groove, the protrusion fits into the recess, and the inclined protrusion fits into the inclined groove and is welded and fixed.

[0009] A further preferred embodiment is that the side wall of the drill bit is provided with a chip guide groove that communicates with the spiral chip removal groove, and the thickness of one side wall of the chip guide groove is greater than the thickness of the other side wall of the chip guide groove.

[0010] A further preferred embodiment is that the protrusion is a platform protrusion;

[0011] The recessed portion is a planar recessed portion.

[0012] A further preferred embodiment is that the drill bit groove is a Y-shaped groove, a cross-shaped groove, or a large-character-shaped groove;

[0013] The blade structure is a three-blade, four-blade, five-blade, or six-blade structure.

[0014] A further preferred embodiment is that the inclination angle between the inclined groove and the platform protrusion is 110-170 degrees.

[0015] Alternatively, the protrusion is preferably an arc-shaped protrusion.

[0016] The recessed portion is an arc-shaped recessed portion.

[0017] A further preferred embodiment is that the drill bit groove is a cross-shaped groove;

[0018] The blade structure is either a four-blade structure or a six-blade structure.

[0019] A further preferred embodiment is that the edge and top edge of the cutting edge structure both extend beyond the surface of the drill bit.

[0020] This utility model has positive effects: The structure of this utility model is reasonably designed. The end face of the drill bit is provided with a drill cutting groove, the bottom wall of the drill cutting groove is a protrusion, and the end edge of the drill cutting groove is an inclined groove that slopes downward from the protrusion. It works in conjunction with the recessed part and the inclined protrusion of the cutting edge structure. When the two are assembled, the stability and reliability of the assembly can be improved. It is also beneficial to increase the connection area between the two, thereby improving the strength and toughness of the overall structure. It ensures that the stress point of the cutting edge structure is at the center point during drilling, reduces the stress point around the cutting edge structure, improves the efficiency and service life of drilling, and is stable and reliable in use.

[0021] Furthermore, the thickness of one side of the chip guide groove is greater than that of the other side. Guided chips from the thinner side can reduce the resistance to chip removal, which is beneficial to improving the effectiveness and efficiency of chip guiding. Moreover, the thicker side can also increase the support force of the cutting edge structure, thereby increasing the torque during drilling and ensuring the stability and reliability of drilling. Attached Figure Description

[0022] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0023] Figure 1 This is a schematic diagram of the first structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the disassembled structure of this utility model;

[0025] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle;

[0026] Figure 4 This is a schematic diagram of the specific structure of the blade in this utility model;

[0027] Figure 5 This is a schematic diagram of the second structure of this utility model;

[0028] Figure 6 for Figure 5 A schematic diagram of the split structure;

[0029] Figure 7 This is a schematic diagram of the third structure of this utility model;

[0030] Figure 8 This is a schematic diagram of the fourth structure of this utility model.

[0031] Reference numerals: 1. Drill shank; 2. Drill rod; 3. Spiral chip removal groove; 4. Drill cutting edge groove; 5. Protrusion; 51. Inclined groove; 52. Cutting edge structure; 6. Chip guide groove; 7. Recess; 8. Inclined protrusion; 9. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Example 1

[0034] See Figures 1 to 4 As shown, a drill bit structure with combined cutting edges includes a drill shank 1, a drill rod 2 integrally formed on the drill shank, and a drill bit 3 integrally formed on the drill shank. The drill rod is provided with a spiral chip removal groove 4. In this embodiment, the above structure is a conventional structure of the prior art, and it is simply applied, so it is not described in detail.

[0035] Meanwhile, in practical applications, the drill bit has a drill bit groove 5 on its end face; and the bottom wall of the drill bit groove has a protrusion 51 in the middle, and the end edge of the drill bit groove is an inclined groove 52 that slopes downward from the protrusion; in this embodiment, the inclination angle between the inclined groove and the platform protrusion is 110-170 degrees. The protrusion is a platform protrusion; by setting the inclined groove, the contact area of ​​the cutting edge structure can be increased, and its toughness and strength can also be improved.

[0036] Furthermore, in practical applications, the drill bit's end is provided with a cutting edge structure 6. The bottom surface of the cutting edge structure has a recessed portion 8 that mates with the protrusion, and an inclined protrusion 9 that mates with the inclined groove at the bottom edge. In this embodiment, the recessed portion is a planar recessed portion. During assembly, both the edge and top edge of the cutting edge structure extend beyond the surface of the drill bit. The cutting edge structure is installed within the drill bit groove, the protrusion fits into the recessed portion, and the inclined protrusion fits into and is welded to the inclined groove. This structure increases the contact area of ​​the cutting edge structure, which is beneficial for improving the overall structural stability and reliability.

[0037] In practical applications, the drill bit has a chip guide groove 7 on its side wall that communicates with the spiral chip removal groove. The thickness of one side wall of the chip guide groove is greater than the thickness of the other side wall. In this embodiment, the thickness of one side wall of the chip guide groove is greater than the thickness of the other side wall. Therefore, after the cutting edge structure is installed, one end of the chip guide groove is close to the side of the cutting edge structure or in complete contact with the cutting edge structure. This helps to reduce the resistance to chip removal during drilling, thereby improving the effectiveness of chip removal and chip guidance, and enhancing the reliability and smoothness of chip guidance.

[0038] Furthermore, in this embodiment, the cutting edge structure is a six-flute structure. In practical applications, the chip guide groove is an arc-shaped groove or a V-shaped groove. This structure also improves the effectiveness and reliability of chip guiding and removal.

[0039] This utility model has positive effects: The structure of this utility model is reasonably designed. The end face of the drill bit is provided with a drill cutting groove, the bottom wall of the drill cutting groove is a protrusion, and the end edge of the drill cutting groove is an inclined groove that slopes downward from the protrusion. It works in conjunction with the recessed part and the inclined protrusion of the cutting edge structure. When the two are assembled, the stability and reliability of the assembly can be improved. It is also beneficial to increase the connection area between the two, thereby improving the strength and toughness of the overall structure. It ensures that the stress point of the cutting edge structure is at the center point during drilling, reduces the stress point around the cutting edge structure, improves the efficiency and service life of drilling, and is stable and reliable in use.

[0040] Furthermore, the thickness of one side of the chip guide groove is greater than that of the other side. Guided chips from the thinner side can reduce the resistance to chip removal, which is beneficial to improving the effectiveness and efficiency of chip guiding. Moreover, the thicker side can also increase the support force of the cutting edge structure, thereby increasing the torque during drilling and ensuring the stability and reliability of drilling.

[0041] Example 2

[0042] See Figures 5 to 6 As shown, this embodiment is basically the same as embodiment 1, except that: the drill groove is a large-character groove; and the blade structure is a five-blade structure.

[0043] Example 3

[0044] See Figure 7 As shown, this embodiment is basically the same as embodiment 1, except that: in actual application, its drill groove is a cross-shaped groove, and the cutting edge structure is a four-blade structure.

[0045] Example 4

[0046] See Figures 5 to 6 As shown, this embodiment is basically the same as embodiment 1, except that: in actual application, its drill groove is a Y-shaped groove, and the cutting edge structure is a three-blade structure.

[0047] Example 5

[0048] This embodiment is basically the same as Embodiment 1, except that: the protrusion is an arc-shaped protrusion; the recess is an arc-shaped recess. The drill bit groove is a cross-shaped groove; the cutting edge structure is a four-flute structure. In this embodiment, a four-flute structure and a six-flute structure are used, which makes it easy to process into an arc shape and improves the convenience of processing.

[0049] Example 6

[0050] This embodiment is basically the same as embodiment 5, except that the blade structure is a six-blade structure.

[0051] Example 7

[0052] This embodiment is basically the same as embodiment 1, except that in actual application, the protrusion can be a stepped or other structure, and the recessed part can be matched with the protrusion.

[0053] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural parts described in the instruction manual can also be processed without any doubt based on existing technical common sense. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, these obvious variations or modifications derived from the essential spirit of this utility model still fall within the protection scope of this utility model.

Claims

1. A drill bit structure with combined cutting edges, comprising a drill shank, a drill rod integrally formed on the drill shank, and a drill bit integrally formed on the drill shank, wherein the drill rod is provided with a spiral chip removal groove, characterized in that: The drill bit has a drill cutting groove on its end face; The bottom wall of the drill bit groove is a raised part in the middle, and the end edge of the drill bit groove is an inclined groove that slopes downward from the raised part. The drill bit has a cutting edge structure at its end. The bottom surface of the cutting edge structure has a recessed part in the middle that matches the protrusion, and the bottom edge of the cutting edge structure has an inclined protrusion that matches the inclined groove. The cutting edge structure is installed in the drill bit groove, the protrusion fits into the recess, and the inclined protrusion fits into the inclined groove and is welded and fixed.

2. The drill bit structure with combined cutting edges according to claim 1, characterized in that: The drill bit has a chip guide groove on its side wall that is connected to the spiral chip removal groove. The thickness of one side wall of the chip guide groove is greater than the thickness of the other side wall.

3. The drill bit structure with combined cutting edges according to claim 2, characterized in that: The protrusion is a platform protrusion; The recessed portion is a planar recessed portion.

4. The drill bit structure with combined cutting edges according to claim 3, characterized in that: The drill bit groove is a Y-shaped groove, a cross-shaped groove, or a large-character-shaped groove; The blade structure is a three-blade, four-blade, five-blade, or six-blade structure.

5. The drill bit structure with combined cutting edges according to claim 4, characterized in that: The inclination angle between the inclined groove and the platform protrusion is 110-170 degrees.

6. The drill bit structure with combined cutting edges according to claim 2, characterized in that: The protrusion is an arc-shaped protrusion; The recessed portion is an arc-shaped recessed portion.

7. The drill bit structure with combined cutting edges according to claim 6, characterized in that: The drill bit groove is a cross-shaped groove; The blade structure is either a four-blade structure or a six-blade structure.

8. The drill bit structure with combined cutting edges according to claim 1, characterized in that: The edges and top edges of the cutting edge structure extend beyond the surface of the drill bit.

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