Arc angle drill bit

Abstract

The utility model relates to an arc-angle drill bit, which comprises a supporting seat, an arc-angle drill bit and an arc-angle drill bit, the multiple arc angle drill bits are arranged on the circumference and are all fixed to the supporting base, and cutting edge parts of the arc angle drill bits are arranged to be in a wave shape; and the multiple discharging holes are formed in the end face of the supporting base. According to the drill bit, the arc-angle drill bit is arranged, and the arc cutting edge of the arc-angle drill bit can disperse cutting stress and reduce the risk of edge tip cracking during drilling, so that the service life of the drill bit can be prolonged, the number of times of drill bit replacement can be reduced, burrs and microcracks on the edge of a drilled hole can be reduced, and the hole wall roughness can be reduced. The supporting seat and the arc-angle drill bit are made of steel, so that the impact resistance is high during drilling, tipping is not easy to occur under intermittent cutting, the price is lower than that of a sintered drill bit, and the practicability is improved.

Description

Technical Field

[0001] This utility model belongs to the field of drill bit design technology, and specifically relates to an arc-angle drill bit. Background Technology

[0002] In the existing technology, most drilling uses right-angle drill bits. Although right-angle drill bits can achieve fast drilling, the sharp corners (such as 118° apex angle) of right-angle drill bits are prone to local high stress, which can lead to chipping and make it impossible to achieve stable drilling. It is often necessary to change drill bits multiple times during the drilling process, which affects drilling efficiency. Moreover, to adapt to drilling of high hardness, sintered drill bits are usually selected. These drill bits are more expensive, resulting in insufficient practicality. Utility Model Content

[0003] To achieve the above objectives, this utility model provides the following technical solution: an arc-angle drill bit, comprising: a support base, mounted on an external drill rod;

[0004] The arc-angle drill bit has multiple circumferentially arranged parts, all of which are fixed on the support base. The cutting edge of the arc-angle drill bit is configured in a wave shape.

[0005] Multiple discharge holes are provided, all of which are opened inside the end face of the support base;

[0006] When the support base drives the arc-angle drill bit to rotate, the cutting edge of the arc-angle drill bit can disperse the cutting stress and achieve stable drilling.

[0007] As a further improvement of this utility model, the arc-angle drill bit includes a connecting seat and a cylindrical head; the connecting seat has multiple slots sequentially opened along the edge of the support seat to the center, and the cylindrical head is configured with multiple slots, which are detachably fixed in the multiple slots.

[0008] As a further improvement of this utility model, the slot is configured as a frustum, the cylindrical head is configured as a frustum, and the installation tolerance between the cylindrical head and the slot is ±0.5mm.

[0009] As a further improvement of this utility model, the small end of the cylindrical head is bonded with an installation key, and a T-shaped annular groove is formed on the inner wall of the small end of the slot, and an insertion hole that matches the installation key is formed on the wall of the T-shaped annular groove. The installation key passes through the insertion hole and is rotatably disposed in the T-shaped annular groove.

[0010] As a further improvement of this utility model, a material guide hole is provided in the support base, and the material guide hole is connected to a plurality of discharge holes.

[0011] As a further improvement of this utility model, the support base and the arc-angle drill bit are both made of steel.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. By setting the arc-angle drill bit, the arc-shaped cutting edge of the arc-angle drill bit can disperse the cutting stress during drilling, reduce the risk of tip breakage, thereby extending the life of the drill bit, reducing the number of drill bit replacements, and reducing burrs and micro-cracks on the drilling edge, thus reducing the roughness of the hole wall.

[0014] 2. The arc-angle drill bit consists of a connecting seat and a cylindrical head. On the one hand, during deep hole machining, the arc-shaped part between the two slots on the connecting seat is used for chip removal, thus expanding the inlet space of the chip removal groove, making the chip flow smoother and avoiding the blockage caused by the accumulation of material and slag during drilling. On the other hand, when the arc-angle drill bit has been used for a period of time, the cylindrical head can be directly replaced, reducing material waste, thereby reducing investment costs and improving practicality.

[0015] 3. By making the support base and the arc-angle drill bit into steel, it can ensure strong impact resistance during drilling, prevent chipping under intermittent cutting, and is cheaper than sintered drill bits, thus further improving its practicality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an arc-angle drill bit;

[0017] Figure 2 This is a top view schematic diagram of an arc-angle drill bit;

[0018] Figure 3 This is a schematic diagram showing the positional relationship between the discharge hole and the guide hole of an arc-angle drill bit.

[0019] Among them, 1. support base; 2. arc-angle drill bit; 21. connecting base; 22. cylindrical head; 23. slot; 3. discharge hole; 11. guide hole. Detailed Implementation

[0020] See Figures 1 to 3 As shown, an arc-angle drill bit includes: a support base 1, which is mounted on an external drill rod;

[0021] The arc-angle drill bit 2 has multiple circumferentially arranged parts, all of which are fixed on the support base 1. The cutting edge of the arc-angle drill bit 2 is configured in a wave shape.

[0022] Multiple discharge holes 3 are provided, all of which are opened inside the end face of the support base 1;

[0023] When the support base 1 drives the arc-angle drill bit 2 to rotate, the wavy cutting edge of the arc-angle drill bit 2 can disperse the cutting stress and achieve stable drilling.

[0024] During operation, the support base 1 is fixedly installed on the external drill rod, and the drill rod is connected to the output end of the drill. The drill will drive the arc-angle drill bit 2 to perform drilling work, and the slag after drilling will be discharged through the discharge hole 3.

[0025] Specifically, please refer to Figure 1 During the drilling process, the arc-shaped cutting edge of the arc-angle drill bit 2 can disperse the cutting stress during drilling, reduce the risk of tip breakage, thereby extending the life of the drill bit and reducing the number of times the drill bit needs to be replaced.

[0026] The arc-angle drill bit 2 can reduce burrs and microcracks at the drilling edge. Compared with the right-angle drill bit, which is prone to forming "tear-like" burrs at the hole opening, it can avoid secondary counterboring. At the same time, the hole wall roughness can reach Ra≤1.6μm (better than the right-angle drill bit Ra≥3.2μm). Therefore, it can be used for drilling precision assembly holes, thus improving its applicability.

[0027] In a preferred embodiment, the arc-angle drill bit 2 includes a connecting seat 21 and a cylindrical head 22; the connecting seat 21 has a plurality of slots 23 sequentially formed along the edge of the support seat 1 to the center, and the cylindrical head 22 is configured in a plurality of slots 23, which are detachably fixed in the plurality of slots 23.

[0028] The aforementioned cylindrical heads 22 form a wavy cutting edge between the connecting seat 21 and the above-mentioned cylindrical heads 22.

[0029] During deep hole machining, the arc-shaped part between the two slots on the connecting seat 21 is used for slag removal, thus expanding the inlet space of the chip removal groove, making the chip flow smoother, and avoiding the blockage caused by the accumulation of slag during drilling.

[0030] Moreover, since the cylindrical head 22 drills in first, after long-term use, the chip-cutting ability of the cutting edge of the cylindrical head 22 is weakened compared with that of the cutting edge of the connecting seat 21. Therefore, after a period of use, the cylindrical head 22 can be directly replaced, reducing material waste, thereby reducing investment costs and improving practicality.

[0031] In a preferred embodiment, the slot 23 is configured as a frustum, the cylindrical head 22 is configured as a frustum, and the installation tolerance between the cylindrical head 22 and the slot 23 is ±0.5mm.

[0032] In detail, the large end face of the cylindrical head 22 is the cutting surface. During the cutting and drilling process, when the cutting surface of the cylindrical head 22 completes the cutting, the slag can smoothly enter the gap between the two connecting seats 21 along the frustum surface of the slot 23, thus avoiding blockage.

[0033] In addition, the cylindrical head 22 and the slot 23 are very small during installation, which can ensure that the cylindrical head 22 is completely fitted into the slot 23, and can also prevent material residue from easily entering the gap between the cylindrical head 22 and the slot 23, thus preventing the cylindrical head 22 from being difficult to remove when it is replaced later.

[0034] In a preferred embodiment, the small end of the cylindrical head 22 is bonded with an installation key, and the inner wall of the small end of the slot 23 is provided with a T-shaped annular groove, and the wall of the T-shaped annular groove is provided with an insertion hole that matches the installation key. The installation key passes through the insertion hole and is rotatably disposed in the T-shaped annular groove.

[0035] When installing the cylindrical head 22, first insert the end with the mounting key into the slot 23, rotate the cylindrical head 22 so that the T-shaped groove passes through the insertion hole and enters the T-shaped groove, and then continue to rotate the cylindrical head 22 so that the inner wall of the T-shaped groove limits the mounting key, thereby ensuring that the slot 23 completely limits the cylindrical head 22 and prevents the cylindrical head 22 from falling out of the slot 23 during drilling; when disassembling the cylindrical head 22, first twist the cylindrical head 22 to align the mounting key with the insertion hole, and then pull out the cylindrical head 22.

[0036] In a preferred embodiment, the support base 1 is provided with a guide hole 11, which is connected to a plurality of discharge holes 3.

[0037] During the drilling process, the drilled slag is discharged into the guide hole 11 through multiple discharge holes 3, and finally the slag is discharged.

[0038] In a preferred embodiment, both the support base 1 and the arc-angle drill bit 2 are made of steel.

[0039] It should be explained that steel-bodied drill bits are made entirely of high-strength alloy steel (such as 42CrMo or 40Cr), and are a type of drilling tool that achieves its cutting function through heat treatment and precision machining. This material has strong impact resistance, is not prone to chipping under intermittent cutting, and is much cheaper than sintered material drill bits (e.g., a Φ10mm steel-bodied drill bit costs about 20 yuan, while a similar sintered material drill bit costs about 150 yuan).

[0040] In practical applications, before drilling, the support base 1 is connected to the drill rod, and then the drill rod is connected to the drilling machine. The drilling machine is started to carry out drilling work. During this process, the support base 1 drives the arc-angle drill bit 2 to rotate. The cutting edge of the wavy arc-angle drill bit 2 can disperse the chip stress, reduce the risk of tip breakage, and reduce the number of times the drill bit needs to be replaced. During the drilling process, the slag will enter the guide hole 11 through multiple discharge holes 3 and finally be discharged.

[0041] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be primarily defined by the scope of the claims.

Claims

1. An arc-angle drill bit, characterized in that: include: Support base (1), installed on the external drill pipe; The arc-angle drill bit (2) has multiple circumferentially arranged parts, all of which are fixed on the support base (1). The cutting edge of the arc-angle drill bit (2) is configured in a wave shape. Multiple discharge holes (3) are provided, all of which are opened inside the end face of the support base (1); When the support base (1) drives the arc-angle drill bit (2) to rotate, the cutting edge of the arc-angle drill bit (2) can disperse the cutting stress and achieve stable drilling.

2. The arc-angle drill bit according to claim 1, characterized in that: The arc-angle drill bit (2) includes a connecting seat (21) and a cylindrical head (22); the connecting seat (21) has multiple slots (23) sequentially opened along the edge of the support seat (1) to the center, and the cylindrical head (22) is configured in multiple ways, each of which is detachably fixed in multiple slots (23).

3. The arc-angle drill bit according to claim 2, characterized in that: The slot (23) is configured as a frustum, the cylindrical head (22) is configured as a frustum, and the installation tolerance between the cylindrical head (22) and the slot (23) is ±0.5mm.

4. The arc-angle drill bit according to claim 3, characterized in that: The small end of the cylindrical head (22) is attached with an installation key. The inner wall of the small end of the slot (23) is provided with a T-shaped ring groove, and the wall of the T-shaped ring groove is provided with an insertion hole that matches the installation key. The installation key passes through the insertion hole and is rotatably set in the T-shaped ring groove.

5. The arc-angle drill bit according to claim 1, characterized in that: The support base (1) has a guide hole (11) inside, and the guide hole (11) is connected to a plurality of discharge holes (3).

6. The arc-angle drill bit according to claim 1, characterized in that: The support base (1) and the arc-angle drill bit (2) are both made of steel.

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