Hole-making limiting structure and punching device thereof

Abstract

The utility model discloses a drilling limiting structure and a punching device thereof, the drilling limiting structure comprises a limiting ring and a base, and the limiting ring is used for movably sleeving the periphery of a drill bit of the punching device in the axial direction and is locked through a locking assembly; the lower end of the base in the axial direction is suitable for abutting against the outer surface of a punched part, and a middle cavity is formed in the upper end of the base in the axial direction. A limiting baffle seat is arranged in the middle cavity, extends out of the base along the axial upper end, and is used for abutting against the limiting ring; the axial lower end of the limiting stop seat is rotationally connected to the inner bottom wall of the middle cavity through a plane needle bearing in the axial direction; through holes allowing a drill bit to penetrate through are formed in the limiting blocking base, the plane needle bearing and the base in the axial direction in a penetrating mode. The base can be prevented from rotating relative to the outer surface of a part, and then the part is prevented from being scratched.

Description

Technical Field

[0001] The utility model relates to the technical field of aircraft blind hole machining, in particular to a hole-making limiting structure and a hole-drilling device thereof. Background Art

[0002] During the assembly of an aircraft, in order to connect various components, blind holes are usually machined on some components of the aircraft. Currently, most blind holes are machined on aircraft components by numerically controlled drilling equipment. In order to accurately machine blind holes with the required depth, a positioning ring is usually installed on the drill bit of the drilling equipment. When the drill bit descends until the positioning ring abuts against the outer surface of the aircraft component, it means that the blind hole with the required depth has been machined. However, after the positioning ring of the existing drilling equipment abuts against the outer surface of the aircraft component, it still rotates with the drill bit, which is likely to scratch the aircraft component. Summary of the Utility Model

[0003] Therefore, the technical problem to be solved by the utility model is to overcome the defect that the positioning ring of the drilling equipment in the prior art still rotates relatively after abutting against the outer surface of the part to be drilled, which is likely to scratch the part, so as to provide a hole-making limiting structure and a hole-drilling device thereof.

[0004] A hole-making limiting structure provided according to the first aspect of the utility model is applied and connected to a hole-drilling device. The hole-making limiting structure includes:

[0005] A limiting ring, which is used for axially sleeving around the outer periphery of the drill bit of the hole-drilling device and is locked by a locking assembly;

[0006] A base, the lower end along the axis is adapted to abut against the outer surface of the part to be drilled, and a middle cavity is arranged inside the upper end of the base along the axis;

[0007] A limiting stop seat is arranged in the middle cavity. The upper end of the limiting stop seat along the axis extends outside the base and is used for abutting against the limiting ring. The lower end of the limiting stop seat along the axis is rotationally connected to the inner bottom wall of the middle cavity through a flat needle bearing around the axis. The limiting stop seat, the flat needle bearing and the base are all axially penetrated with through holes for the drill bit to pass through.

[0008] The hole-making limiting structure according to the utility model has at least the following technical effects:

[0009] 1. By extending the upper end of the limit stop seat along the axial direction to the outside of the base, the other end is rotatably connected to the inner bottom wall of the middle cavity through a plane needle roller bearing, and the limit stop seat, the plane needle roller bearing and the base are all axially penetrated with a through hole for the drill bit to pass through; in the process of using the punching device equipped with the hole-making limit structure to process blind holes on parts, the base is firstly abutted against the outer surface of the part to be punched, and then the drill bit with a limit ring is passed through the through hole and axially descended on the part to punch; when the hole is punched to the required depth, the limit ring abuts against the upper end surface of the limit stop seat along the axial direction, exerts downward pressure on the limit stop seat, and drives the limit stop seat to rotate axially relative to the base with the plane needle roller bearing, thereby reducing the torque transmitted to the base, thereby avoiding relative rotation of the base relative to the outer surface of the part, and then avoiding scratches on the part, ensuring the quality of the blind hole processing on the part.

[0010] 2. By movably setting the limit ring on the drill bit along the axial direction and locking it through the locking assembly, the position of the limit ring can be flexibly adjusted to the required axial distance from the tip of the drill bit and locked according to the needs of different depths of the blind holes to be processed, which is more practical.

[0011] Preferably, the plane needle roller bearing includes a connecting ring arranged in the central cavity, and the end surface of the connecting ring axially away from the limiting ring is provided with a plurality of mounting grooves spaced circumferentially, and a needle roller is rotatably connected in the mounting groove, the needle roller is arranged radially along the limiting ring, and the relative lower end of the needle roller along the axial direction extends to the outside of the connecting ring.

[0012] Preferably, the mounting groove penetrates the connecting ring in the axial direction, and the upper end of the needle roller in the axial direction extends to the outside of the connecting ring.

[0013] Preferably, the projection of the limit stop seat along the axial direction falls within the range of the plane needle roller bearing.

[0014] Preferably, the outer diameter of the plane needle roller bearing is smaller than the inner diameter of the middle cavity, and the plane needle roller bearing is movably arranged on the inner bottom wall of the middle cavity along the radial direction of the limiting ring.

[0015] Preferably, a limiting protrusion is provided on the outer wall of the portion of the limiting stop seat located in the middle cavity, and an anti-loss ring is detachably connected to the axial upper end opening of the middle cavity, and the axial projection of the anti-loss ring overlaps with the limiting protrusion.

[0016] Preferably, the inner peripheral wall at the upper end opening of the middle cavity is provided with an internal threaded portion, and the outer peripheral wall of the anti-lost ring is provided with an external threaded portion matching the internal threaded portion.

[0017] Preferably, the anti-loss ring has at least two force-applying grooves evenly distributed along the circumferential direction on the upper end surface along the axial direction.

[0018] Preferably, a plurality of slots are circumferentially arranged on the lower end surface of the base, one end of each slot in the radial direction of the limiting ring penetrates through the base, and the other end communicates with the through hole of the base;

[0019] And / or, a threaded hole is formed through the outer side wall of the limiting ring in the radial direction of the limiting ring, and the locking assembly includes a locking screw matching the threaded hole; when the limiting ring is locked and connected to the outer peripheral surface of the drill bit, the locking screw is screwed into the threaded hole, and the tip of the locking screw abuts against the outer peripheral surface of the drill bit;

[0020] And / or, a polytetrafluoroethylene layer is arranged at the lower end of the base along the axis.

[0021] A hole punching device according to the second aspect of the present invention includes the hole making limiting structure provided in the first aspect above.

[0022] A hole punching device according to the present invention has at least the following technical effects:

[0023] 1. The hole making limiting structure extends the upper end of the limiting seat along the axis outside the base, and the other end is rotatably connected to the inner bottom wall of the middle cavity through a flat needle bearing, and the limiting seat, the flat needle bearing and the base are all axially penetrated with through holes for the drill bit to pass through; during the process of using this hole punching device to process a blind hole on a part, first abut the base against the outer surface of the part to be punched, and then pass the drill bit with a limiting ring through the through hole and descend along the axis to punch a hole on the part; when punching to the required depth, the limiting ring abuts against the upper end surface of the limiting seat along the axis, apply a downward pressure on the limiting seat, and drive the limiting seat to rotate relative to the base around the axis with the flat needle bearing, reducing the torque transmitted to the base, thereby avoiding relative rotation of the base relative to the outer surface of the part, and further avoiding scratching the part, ensuring the quality of processing the blind hole on the part.

[0024] 2. The hole making limiting structure axially movably arranges the limiting ring on the drill bit and locks it through the locking assembly, and can flexibly adjust the position of the limiting ring to reach the required distance from the tip of the drill bit along the axis according to the needs of different depths of the blind hole to be processed and lock it, with stronger practicability.

[0025] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0026] To more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 Structural schematic diagram of a hole-making limiting structure equipped with a drill bit for this embodiment;

[0028] Figure 2 For Figure 1 Partial sectional structural schematic diagram of another perspective;

[0029] Figure 3 Structural schematic diagram of a plane needle roller bearing in a hole-making limiting structure of this embodiment;

[0030] Figure 4 Structural schematic diagram of a base in a hole-making limiting structure of this embodiment;

[0031] Figure 5 Structural schematic diagram of a anti-loss ring in a hole-making limiting structure of this embodiment;

[0032] Figure 6 Structural schematic diagram of a limiting block seat in a hole-making limiting structure of this embodiment.

[0033] Explanation of reference numerals:

[0034] 100 - Limiting ring;

[0035] 200 - Drill bit;

[0036] 300 - Base, 310 - Middle cavity, 320 - Groove;

[0037] 400 - Limiting block seat, 410 - Limiting protrusion;

[0038] 500 - Plane needle roller bearing, 510 - Connecting ring, 511 - Installation groove, 520 - Needle roller;

[0039] 600 - Anti-loss ring, 610 - Force application groove;

[0040] 700 - Locking screw. Specific embodiments

[0041] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work shall fall within the protection scope of the present utility model.

[0042] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0043] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0044] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0045] Embodiment 1

[0046] Such as Figures 1 to 4 And Figure 6Shown is a hole-making limiting structure provided by this embodiment, which is applied and connected to a drilling device. The hole-making limiting structure includes a limiting ring 100 and a base 300. The limiting ring 100 is used to axially movably sleeved on the outer periphery of the drill bit 200 of the drilling device and is locked by a locking assembly. The lower end of the base 300 in the axial direction is adapted to abut against the outer surface of the part to be drilled. A middle cavity 310 is provided inside the upper end of the base 300 in the axial direction. A limiting seat 400 is arranged inside the middle cavity 310. The upper end of the limiting seat 400 in the axial direction extends outside the base 300 and is used to abut against the limiting ring 100. The lower end of the limiting seat 400 in the axial direction is rotationally connected to the inner bottom wall of the middle cavity 310 through a flat needle bearing 500 around the axial direction. The limiting seat 400, the flat needle bearing 500, and the base 300 are all axially penetrated with through holes for the drill bit 200 to pass through. It can be understood that the axial direction mentioned in the text refers to Figure 2 the axial direction in

[0047] In the hole-making limiting structure of this embodiment, by extending the upper end of the limiting seat 400 in the axial direction outside the base 300, and the other end is rotationally connected to the inner bottom wall of the middle cavity 310 through a flat needle bearing 500, and the limiting seat 400, the flat needle bearing 500, and the base 300 are all axially penetrated with through holes for the drill bit 200 to pass through. During the process of using the drilling device equipped with the hole-making limiting structure of this embodiment to process blind holes on parts, first, the base 300 is abutted against the outer surface of the part to be drilled, and then the drill bit 200 with the limiting ring 100 is passed through the through hole and lowered axially to drill holes on the part. When drilling to the required depth, the limiting ring 100 abuts against the upper end face of the limiting seat 400 in the axial direction, applying a downward pressure on the limiting seat 400, and driving the limiting seat 400 to rotate relative to the base 300 around the axial direction along with the flat needle bearing 500, reducing the torque transmitted to the base 300, thereby avoiding relative rotation of the base 300 relative to the outer surface of the part, and further avoiding scratching the part, ensuring the quality of processing blind holes on the part. Also, by axially movably arranging the limiting ring 100 on the drill bit 200 and locking it through a locking assembly, according to the needs of different depths of the blind holes to be processed, the position of the limiting ring 100 can be flexibly adjusted to reach the required distance from the tip of the drill bit 200 in the axial direction and locked, with stronger practicability.

[0048] Such as Figure 2 and Figure 3As shown, optionally, the planar needle roller bearing 500 includes a connecting ring 510 disposed in the middle cavity 310. A plurality of mounting grooves 511 are circumferentially and equally spaced along the end face of the connecting ring 510 that axially faces away from the limiting ring 100. Here, preferably, there are six mounting grooves 511. A needle roller 520 is rotatably connected in the mounting groove 511. The needle roller 520 is arranged radially with respect to the limiting ring 100, and the relative lower end of the needle roller 520 in the axial direction extends outside the connecting ring 510. By circumferentially arranging six rotatable needle rollers 520 on the connecting ring 510, and the lower end of the needle roller 520 in the axial direction extends outside the connecting ring 510 and abuts against the inner bottom wall of the middle cavity 310, the friction between the planar needle roller bearing 500 and the inner bottom wall of the middle cavity 310 is rolling friction, and the friction coefficient is small. Thus, after the limiting ring 100 abuts against the upper end face of the limiting seat 400 in the axial direction and applies a downward pressure on the limiting seat 400, the torque transmitted to the base 300 through the planar needle roller bearing 500 is reduced, more effectively avoiding relative rotation of the base 300 relative to the outer surface of the part, and further avoiding scratching the part, ensuring the quality of the blind hole machined on the part.

[0049] In specific applications, the number of the mounting grooves 511 is reasonably increased or decreased according to actual situations. For example, in other embodiments, the mounting grooves 511 are provided with two, three, four, five, seven, etc.

[0050] As Figure 2 and Figure 3 As shown, optionally, the mounting groove 511 axially penetrates the connecting ring 510, and the relative upper end of the needle roller 520 in the axial direction extends outside the connecting ring 510. By extending the upper end of the needle roller 520 in the axial direction outside the connecting ring 510 and abutting against the limiting seat 400, the friction between the planar needle roller bearing 500 and the lower end face of the limiting seat 400 is rolling friction, and the friction coefficient is small; the torque transmitted to the needle roller 520 can be reduced when the limiting ring 100 abuts against the upper end face of the limiting seat 400 in the axial direction and applies a downward pressure on the limiting seat 400, thereby further reducing the torque transmitted by the needle roller 520 to the base 300, more effectively avoiding scratching the part by the base 300, and ensuring the quality of the blind hole machined on the part.

[0051] As Figure 2 As shown, optionally, the axial projection of the limiting seat 400 falls within the range of the planar needle roller bearing 500. By increasing the contact area between the planar needle roller bearing 500 and the bottom end face of the middle cavity 310, the planar needle roller bearing 500 is more convenient to rotate around the axial direction relative to the base 300, thereby more effectively avoiding scratching the part by the base 300.

[0052] As Figure 2As shown, optionally, the outer diameter of the flat needle roller bearing 500 is smaller than the inner diameter of the middle cavity 310, and it is movably arranged on the inner bottom wall of the middle cavity 310 along the radial direction of the limit ring 100. By reserving the movement amount along the radial direction of the limit ring 100 between the flat needle roller bearing 500 and the base 300, it is avoided that the drill bit 200 is not centered during the limiting process of the limit ring 100 or the limit retaining seat 400, etc., and the hole-making accuracy is affected during the drilling cutting process of descending along the axial direction.

[0053] It can be understood that the radial directions of the limit ring 100, the base 300, the flat needle roller bearing 500, the limit retaining seat 400, and the anti-loss ring 600 are the same orientation.

[0054] As Figure 2 As shown, optionally, a limit protrusion 410 is provided on the outer side wall of the part of the limit retaining seat 400 located in the middle cavity 310. A detachable anti-loss ring 600 is connected to the upper end opening of the middle cavity 310 along the axial direction, and the projection part of the anti-loss ring 600 along the axial direction overlaps with the limit protrusion 410. Considering that the limit retaining seat 400 is rotationally connected to the middle cavity 310 along the axial direction through the flat needle roller bearing 500, and the flat needle roller bearing 500 is movably arranged on the inner bottom wall of the middle cavity 310 along the radial direction of the limit ring 100, therefore, in order to prevent the limit retaining seat 400 and the flat needle roller bearing 500 from disengaging from the upper end opening of the middle cavity 310 along the axial direction, in this embodiment, an anti-loss ring 600 is provided at the upper end opening of the middle cavity 310, and the lower end surface of the anti-loss ring 600 along the axial direction is in contact with the upper end surface of the limit protrusion 410 along the axial direction to realize the stroke limiting function of the limit retaining seat 400, effectively preventing the limit retaining seat 400 and the flat needle roller bearing 500 from disengaging from the middle cavity 310 of the base 300. At the same time, by providing a spacing space between the inner peripheral wall of the anti-loss ring 600 and the outer peripheral surface of the limit retaining seat 400 along the radial direction of the limit ring 100, a pad sleeve with a corresponding length can be sleeved outside the part of the limit retaining seat 400 located above the limit protrusion 410 according to the actual depth of the blind hole to be processed, so that the upper end surface of the corresponding pad sleeve along the axial direction is higher than the upper end surface of the limit retaining seat 400 along the axial direction, and the axial spacing between the two is a set distance, meeting the processing requirements for different depths of the blind hole to be processed.

[0055] Optionally, an internal thread part is provided on the inner peripheral wall of the upper end opening of the middle cavity 310, and an external thread part matching the internal thread part is provided on the outer peripheral wall of the anti-loss ring 600. By the way of screwing the internal thread part and the external thread part, it is not only convenient to firmly connect the anti-loss ring 600 and the base 300 into one body; but also convenient to remove the anti-loss ring 600 from the base 300 so as to take out the parts located in the base 300 for replacement or repair.

[0056] As shown Figure 5 In the figure, optionally, at least two force - applying grooves 610 are circumferentially and uniformly distributed on the upper end surface of the anti - loss ring 600 along the axial direction. The force - applying grooves 610 provide positions for the disassembly and assembly tool to apply force, so as to drive the anti - loss ring 600 to rotate, and screw the external thread part and the internal thread part tightly or loosen them from each other, making the operation more convenient.

[0057] As shown Figure 2 and Figure 5 In the figure, optionally, a plurality of slots 320 are circumferentially arranged on the lower end surface of the base 300. One end of each slot 320 along the radial direction of the limiting ring 100 penetrates through the base 300, and the other end communicates with the through - hole of the base 300. The slots 320 are used to discharge materials such as debris cut from the aircraft component during the hole - making process, avoiding scratching the aircraft component.

[0058] As shown Figure 1 and Figure 2 In the figure, optionally, a threaded hole is formed through the outer side wall of the limiting ring 100 along the radial direction of the limiting ring 100. The locking assembly includes a locking screw 700 that matches the threaded hole. According to the need for different depths of the blind hole to be machined, after the limiting ring 100 is flexibly and steplessly adjusted to move axially relative to the drill bit 200 to the required position, the locking screw 700 is screwed into the threaded hole, and the tip of the locking screw 700 abuts against the outer peripheral surface of the drill bit 200 to fix the limiting ring 100 and the drill bit 200 into one body, so as to meet the processing requirements for blind holes of different depths and have stronger practicability.

[0059] Optionally, a polytetrafluoroethylene layer is provided at the lower end of the base 300 along the axial direction. The polytetrafluoroethylene layer reduces the friction between the lower end of the base 300 and the outer surface of the part to be drilled, effectively avoiding scratching the part.

[0060] Embodiment 2

[0061] As shown Figures 1 to 6 In the figure is shown a hole - drilling device provided in this embodiment, including the hole - drilling device described in Embodiment 1.

[0062] In the hole-making limiting structure of the hole-drilling device in this embodiment, the limiting seat 400 extends axially upwards to the outside of the base 300, and the other end is rotatably connected to the inner bottom wall of the middle cavity 310 through a planar needle roller bearing 500. The limiting seat 400, the planar needle roller bearing 500, and the base 300 are all axially penetrated with through holes for the drill bit 200 to pass through. During the process of using the hole-drilling device in this embodiment to process blind holes on parts, first, the base 300 is abutted against the outer surface of the part to be drilled, and then the drill bit 200 with the limiting ring 100 is passed through the through hole and lowered axially to drill holes on the part. When drilling to the required depth, the limiting ring 100 abuts against the axially upper end surface of the limiting seat 400, applying a downward pressure on the limiting seat 400 and driving the limiting seat 400 to rotate axially relative to the base 300 along with the planar needle roller bearing 500, reducing the torque transmitted to the base 300, thereby avoiding relative rotation of the base 300 relative to the outer surface of the part, and further avoiding scratching the part, ensuring the quality of processing blind holes on the part.

[0063] The hole-making limiting structure of the hole-drilling device in this embodiment also axially movably arranges the limiting ring 100 on the drill bit 200 and locks it through a locking component. According to the needs of different depths of the blind holes to be processed, the position of the limiting ring 100 can be flexibly adjusted to reach the required position along the axis from the tip of the drill bit 200 and locked, with stronger practicability.

[0064] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A hole-making limiting structure, used to be connected to a punching device, characterized in that: The hole-making and limiting structure comprises: A limiting ring (100) is used to be movably sleeved on the outer periphery of a drill bit (200) of a punching device in the axial direction and locked by a locking assembly; A base (300), the lower end of which along the axial direction is suitable for abutting against the outer surface of the part to be punched, and a middle cavity (310) is provided in the upper end of the base (300) along the axial direction; A limit stopper (400) is arranged in the middle cavity (310); the upper end of the limit stopper (400) along the axial direction extends to the outside of the base (300) and is used to abut the limit ring (100); the lower end of the limit stopper (400) along the axial direction is connected to the inner bottom wall of the middle cavity (310) through a plane needle bearing (500) for axial rotation; the limit stopper (400), the plane needle bearing (500) and the base (300) are all axially penetrated by a through hole for the drill bit (200) to pass through.

2. A hole-making limiting structure according to claim 1, characterized in that: The plane needle roller bearing (500) comprises a connecting ring (510) arranged in the central cavity (310); the end surface of the connecting ring (510) axially away from the limiting ring (100) is provided with a plurality of mounting grooves (511) at intervals in the circumferential direction; a needle roller (520) is rotatably connected in the mounting groove (511); the needle roller (520) is arranged radially of the limiting ring (100), and the relative lower end of the needle roller (520) in the axial direction extends to the outside of the connecting ring (510).

3. A hole-making limiting structure according to claim 2, characterized in that: The mounting groove (511) penetrates the connecting ring (510) in the axial direction, and the upper end of the roller needle (520) in the axial direction extends to the outside of the connecting ring (510).

4. A hole-making and limiting structure according to any one of claims 1 to 3, characterized in that: The projection of the limit stop seat (400) along the axial direction falls within the range of the plane needle roller bearing (500).

5. A hole-making limiting structure according to claim 4, characterized in that: The outer diameter of the plane needle roller bearing (500) is smaller than the inner diameter of the middle cavity (310), and is movably arranged on the inner bottom wall of the middle cavity (310) along the radial direction of the limiting ring (100).

6. A hole-making and limiting structure according to claim 5, characterized in that: A limiting protrusion (410) is provided on the outer side wall of the portion of the limiting stopper (400) located in the middle cavity (310); an anti-lost ring (600) is detachably connected to the upper end opening of the middle cavity (310) along the axial direction; and a projection portion of the anti-lost ring (600) along the axial direction overlaps with the limiting protrusion (410).

7. A hole-making limiting structure according to claim 6, characterized in that: An inner peripheral wall at the upper end opening of the middle cavity (310) is provided with an internal thread portion, and an outer peripheral wall of the anti-lost ring (600) is provided with an external thread portion matching the internal thread portion.

8. A hole-making and limiting structure according to claim 7, characterized in that: The anti-lost ring (600) has at least two force-applying grooves (610) evenly distributed along the circumferential direction on the upper end surface along the axial direction.

9. The hole-making limiting structure according to claim 1, characterized in that: The lower end surface of the base (300) is provided with a plurality of slots (320) along the circumferential direction, one end of the slot (320) along the radial direction of the limiting ring (100) passes through the base (300), and the other end is connected to the through hole of the base (300); And / or, a threaded hole is formed on the outer wall of the limiting ring (100) along the radial direction of the limiting ring (100), and the locking assembly includes a locking screw (700) matching the threaded hole; when the limiting ring (100) is locked and connected to the outer peripheral surface of the drill bit (200), the locking screw (700) is screwed into the threaded hole, and the tip of the locking screw (700) is pressed against the outer peripheral surface of the drill bit (200); And / or, a polytetrafluoroethylene layer is provided at the lower end of the base (300) along the axial direction.

10. A punching device, characterized in that: It comprises a hole-making and limiting structure as described in any one of claims 1 to 9.

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