Manual drilling device with adjustable axial force and drilling method thereof

Abstract

The manual drilling device with the adjustable axial force comprises a mounting base, a drilling mechanism, a force sensor and a feeding driving mechanism, the force sensor is connected with the drilling mechanism and used for detecting the axial force of the drilling mechanism, and the feeding driving mechanism is arranged on the mounting base and used for driving the drilling mechanism to move in a feeding mode. And the force sensor is in telecommunication connection with the feeding driving mechanism. The invention further discloses a drilling method of the drilling device. The device has the advantages that the axial force is adjustable, the defects of burrs, layering and the like are reduced, and the drilling quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of drilling and milling tools, and in particular to a manual drilling device with adjustable axial force and a drilling method thereof. Background Art

[0002] Carbon fiber reinforced composite materials are widely used in aerospace, national defense, sports, wind power and other fields. However, due to the anisotropy of carbon fiber composite materials, fiber tearing, delamination, exit burrs and other damages are prone to occur during the drilling process. With the in-depth study of fiber reinforced composite materials, it is found that in the drilling process of fiber reinforced composite materials, the drilling axial force is extremely critical to the hole making quality. When the axial force is greater than the critical axial force of delamination, delamination defects are likely to occur. For structural parts with huge structural dimensions that cannot be processed by CNC machine tools, manual drilling devices are usually required for drilling at the assembly site. However, the existing manual drilling devices are unable to detect and control the axial force. The axial force is easy to exceed the critical axial force of delamination, causing defects such as delamination and burrs, reducing the processing quality. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a manual drilling device with adjustable axial force and a drilling method thereof, which can reduce defects such as burrs and delamination and improve drilling quality.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A manual drilling device with adjustable axial force comprises a mounting seat, a drilling mechanism, a force sensor and a feed drive mechanism, wherein the force sensor is connected to the drilling mechanism and is used to detect the axial force of the drilling mechanism; the feed drive mechanism is arranged on the mounting seat and is used to drive the drilling mechanism to feed and move; and the force sensor is electrically connected to the feed drive mechanism.

[0006] As a further improvement of the above technical solution:

[0007] The feed drive mechanism includes a feed motor, a screw and a connecting block. The feed motor is arranged on a mounting seat. One end of the screw is connected to the feed motor and the other end is rotatably connected to the mounting seat. The connecting block is threadedly connected to the screw, and the drilling mechanism is arranged on the connecting block.

[0008] The drilling mechanism includes a spindle motor, a sliding seat, an adapter seat and a drill bit. The sliding seat is detachably connected to the connecting block and is slidably mounted on the mounting seat. The spindle motor and the force sensor are respectively mounted on both ends of the sliding seat. The adapter seat is mounted on the force sensor. The drill bit is rotatably mounted on the adapter seat. The spindle motor is connected to the drill bit through a transmission assembly, and the transmission assembly is rotatably penetrated through the sliding seat, the force sensor and the adapter seat.

[0009] The mounting seat is provided with a motor bracket and a screw bracket, the feed motor is mounted on the motor bracket, both ends of the screw bracket are provided with screw support seats for mounting a screw, and the screw is rotatably mounted on the screw support seat.

[0010] The screw rod bracket is provided with a guide groove, and the sliding seat is slidably arranged in the guide groove.

[0011] The transmission assembly includes a motor connecting rod, a drill connecting rod and a transfer rod. One end of the motor connecting rod is connected to the output end of the spindle motor, and the other end is connected to the drill connecting rod through a linear motion bearing. The drill is detachably connected to the drill connecting rod through the transfer rod.

[0012] A bearing seat is arranged on the adapter seat, and the adapter rod is connected to the bearing seat.

[0013] The screw rod is a ball screw rod, and the motor connecting rod and the drill connecting rod are both provided with semicircular grooves for accommodating balls in linear motion bearings.

[0014] The feed motor and the lead screw are connected via a coupling.

[0015] A drilling method for the above-mentioned manual drilling device with adjustable axial force, wherein a feed drive mechanism drives the drilling mechanism to feed and drill, and the drilling axial force of the drilling mechanism is transmitted to a force sensor. When the force sensor detects that the axial force at this time is greater than the critical axial force, the feed drive mechanism is controlled to reduce the feed speed, thereby reducing the overall feed speed and ultimately reducing the axial force. When the force sensor detects that the axial force at this time is less than the critical axial force, the feed drive mechanism is controlled to increase the feed speed, thereby increasing the overall feed speed and ultimately increasing the axial force. The feed speed is continuously adjusted during the drilling process so that the overall feed speed is controlled at the feed speed corresponding to the critical axial force.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] The manual drilling device with adjustable axial force and the drilling method thereof disclosed in the present invention control the feed speed of the feed drive mechanism according to the comparison between the axial force detected by the force sensor and the critical axial force, thereby controlling the overall feed speed of the manual drilling, realizing the adjustment of the axial force of the drilling mechanism, and finally making the overall feed speed close to the feed speed corresponding to the critical axial force, thereby ensuring the drilling efficiency, reducing drilling defects such as delamination and burrs, and improving the drilling quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the manual drilling device with adjustable axial force of the present invention.

[0019] Figure 2It is a schematic diagram of the exploded structure of the manual drilling device with adjustable axial force of the present invention.

[0020] Figure 3 It is a three-dimensional structural schematic diagram of the screw rod in the present invention.

[0021] Figure 4 It is a three-dimensional structural schematic diagram of the sliding seat in the present invention.

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the screw rod bracket in the present invention.

[0023] The symbols in the figure represent:

[0024] 1. Mounting seat; 11. Motor bracket; 12. Screw bracket; 121. Screw support seat; 122. Guide groove; 2. Drilling mechanism; 21. Spindle motor; 22. Sliding seat; 23. Adapter seat; 24. Drill bit; 25. Transmission assembly; 251. Motor connecting rod; 252. Drill bit connecting rod; 253. Adapter rod; 254. Linear motion bearing; 255. Semicircular groove; 26. Bearing seat; 3. Force sensor; 4. Feed drive mechanism; 41. Feed motor; 42. Screw; 43. Connecting block; 44. Coupling. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "assemble", "connect", "connect", "fix" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Embodiment 1

[0030] Figures 1 to 5 An embodiment of a manual drilling device with adjustable axial force of the present invention is shown. The manual drilling device with adjustable axial force of this embodiment includes a mounting seat 1, a drilling mechanism 2, a force sensor 3 and a feed drive mechanism 4. The force sensor 3 is connected to the drilling mechanism 2. The force sensor 3 is used to detect the axial force of the drilling mechanism 2. The feed drive mechanism 4 is arranged on the mounting seat 1. The feed drive mechanism 4 is used to drive the drilling mechanism 2 to feed and move. The force sensor 3 is electrically connected to the feed drive mechanism 4.

[0031] There is a positive relationship between the axial force of the drill bit on the material and the overall feed speed during drilling. The overall feed speed of manual drilling is the vector sum of the feed speed generated by the feed drive mechanism 4 and the feed speed generated by the hand. During drilling, the axial force generated by the drilling mechanism 2 can be detected by the force sensor 3. When the force sensor 3 detects that the axial force at this time is greater than the critical axial force, the feed drive mechanism 4 is controlled to reduce the feed speed, thereby reducing the overall feed speed of the drilling mechanism 2, and finally reducing the axial force. When the force sensor 3 detects that the axial force at this time is less than the critical axial force, the feed drive mechanism 4 is controlled to increase the feed speed, thereby increasing the overall feed speed of the drilling mechanism 2, and finally increasing the axial force. The feed amount is continuously adjusted during the drilling process so that the overall feed speed of the drilling mechanism 2 is controlled at the feed speed corresponding to the critical axial force, thereby realizing the adjustment of the axial force. Of course, in other embodiments, the force sensor 3 can send the detected axial force to the controller, and the controller then controls the feed speed of the feed drive mechanism 4.

[0032] The manual drilling device with adjustable axial force controls the feed speed of the feed drive mechanism 4 according to the comparison between the axial force detected by the force sensor 3 and the critical axial force, thereby controlling the overall feed speed of the manual drilling, realizing the adjustment of the axial force of the drilling mechanism 2, and finally making the overall feed speed close to the feed speed corresponding to the critical axial force, thereby ensuring the drilling efficiency, reducing drilling defects such as delamination and burrs, and improving the drilling quality.

[0033] Furthermore, if Figure 1 , Figure 2 and Figure 3As shown, in this embodiment, the feed drive mechanism 4 includes a feed motor 41, a screw 42 and a connecting block 43. The feed motor 41 is arranged on the mounting seat 1, one end of the screw 42 is connected to the feed motor 41, and the other end is rotatably connected to the mounting seat 1, the connecting block 43 is threadedly connected to the screw 42, and the drilling mechanism 2 is arranged on the connecting block 43. The feed motor 41 drives the screw 42 to rotate, thereby driving the connecting block 43 to move, and finally driving the drilling mechanism 2 to move and feed, and the structure is simple. Preferably, the screw 42 is a ball screw, which has higher precision and more accurate axial force adjustment.

[0034] Furthermore, if Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment, the drilling mechanism 2 includes a spindle motor 21, a sliding seat 22, an adapter seat 23 and a drill bit 24. The sliding seat 22 is detachably connected to the connecting block 43 and is slidably arranged on the mounting seat 1. The spindle motor 21 and the force sensor 3 are respectively mounted on both ends of the sliding seat 22. The adapter seat 23 is mounted on the force sensor 3. The drill bit 24 is rotatably mounted on the adapter seat 23. The spindle motor 21 is connected to the drill bit 24 through a transmission assembly 25. The transmission assembly 25 is rotatably arranged in the sliding seat 22, the force sensor 3 and the adapter seat 23. The sliding seat 22 is detachably connected to the connecting block 43, and can drive the spindle motor 21 and the force sensor 3 to move, realize feeding, and facilitate the disassembly, cleaning and replacement of the drilling mechanism 2. The spindle motor 21 drives the drill bit 24 to rotate through the transmission of the transmission assembly 25 to realize drilling. The adapter seat 23 provides an installation basis for the connection between the drill bit 24 and the spindle motor 21, and the structure is more stable. Preferably, the force sensor 3 and the spindle motor 21 are both detachably connected to the sliding seat 22 to facilitate disassembly, assembly and replacement.

[0035] Furthermore, if Figure 1 , Figure 2 and Figure 5 As shown, in this embodiment, the mounting base 1 is provided with a motor bracket 11 and a screw bracket 12, the feed motor 41 is mounted on the motor bracket 11, and both ends of the screw bracket 12 are provided with screw support seats 121 for mounting the screw 42, and the screw 42 is rotatably mounted on the screw support seat 121. The motor bracket 11 provides a mounting base for the feed motor 41, and the screw bracket 12 and the screw support seat 121 provide a mounting base for the screw 42, and the structure is more stable.

[0036] Furthermore, if Figure 1 , Figure 2 and Figure 5 As shown, in this embodiment, the screw support 12 is provided with a guide groove 122, and the sliding seat 22 is slidably arranged in the guide groove 122. The guide groove 122 provides a limit and guide for the movement of the sliding seat 22 and the connecting block 43.

[0037] Furthermore, if Figure 2 As shown, in this embodiment, the transmission assembly 25 includes a motor connecting rod 251, a drill connecting rod 252 and a transfer rod 253. One end of the motor connecting rod 251 is connected to the output end of the spindle motor 21, and the other end is connected to the drill connecting rod 252 through a linear motion bearing 254. The drill 24 is detachably connected to the drill connecting rod 252 through the transfer rod 253. The spindle motor 21 drives the motor connecting rod 251 to rotate, and the motor connecting rod 251 drives the drill connecting rod 252 to rotate through the linear motion bearing 254, and finally drives the drill 24 to rotate through the transfer rod 253. The drill 24 is detachably connected to the drill connecting rod 252 through the transfer rod 253, which is convenient for disassembly and replacement of the drill 24. Preferably, the motor connecting rod 251 and the drill connecting rod 252 are both provided with a semicircular groove 255 for placing the ball in the linear motion bearing. The friction between the motor connecting rod 251 and the drill connecting rod 252 is reduced, and the transmission accuracy is higher.

[0038] Furthermore, if Figure 1 and Figure 2 As shown, in this embodiment, a bearing seat 26 is provided on the adapter seat 23, and the adapter rod 253 is connected to the bearing seat 26. A mounting base is provided for the adapter rod 253 to reduce friction.

[0039] Furthermore, if Figure 1 and Figure 2 As shown, in this embodiment, the feed motor 41 is connected to the screw rod 42 via a coupling 44. This facilitates the installation of the screw rod 42 and the connection with the feed motor 41.

[0040] Embodiment 2

[0041] In the drilling method of the manual drilling device with adjustable axial force in the present embodiment, the feed drive mechanism 4 drives the drilling mechanism 2 to feed and drill, and the drilling axial force of the drilling mechanism 2 is transmitted to the force sensor 3. When the force sensor 3 detects that the axial force at this time is greater than the critical axial force, the feed drive mechanism 4 is controlled to reduce the feed speed, thereby reducing the overall feed speed and finally reducing the axial force. When the force sensor 3 detects that the axial force at this time is less than the critical axial force, the feed drive mechanism 4 is controlled to increase the feed speed, thereby increasing the overall feed speed and finally increasing the axial force. The feed speed is continuously adjusted during the drilling process so that the overall feed speed is controlled at the feed speed corresponding to the critical axial force.

[0042] This drilling method controls the feed speed of the feed drive mechanism 4 based on the comparison between the axial force detected by the force sensor 3 and the critical axial force, thereby controlling the overall feed speed of manual drilling, realizing the adjustment of the axial force of the drilling mechanism 2, and finally making the overall feed speed close to the feed speed corresponding to the critical axial force, thereby ensuring the drilling efficiency and reducing drilling defects such as delamination and burrs, thereby improving the drilling quality.

[0043] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A manual drilling device with adjustable axial force, characterized in that: The invention comprises a mounting seat (1), a drilling mechanism (2), a force sensor (3) and a feed drive mechanism (4); the force sensor (3) is connected to the drilling mechanism (2); the force sensor (3) is used to detect the axial force of the drilling mechanism (2); the feed drive mechanism (4) is arranged on the mounting seat (1); the feed drive mechanism (4) is used to drive the drilling mechanism (2) to feed and move; and the force sensor (3) is connected to the feed drive mechanism (4) in a telecommunication manner.

2. The manual drilling device with adjustable axial force according to claim 1, characterized in that: The feed drive mechanism (4) comprises a feed motor (41), a screw rod (42) and a connecting block (43); the feed motor (41) is arranged on a mounting seat (1); one end of the screw rod (42) is connected to the feed motor (41) and the other end is rotatably connected to the mounting seat (1); the connecting block (43) is threadedly connected to the screw rod (42); and the drilling mechanism (2) is arranged on the connecting block (43).

3. The manual drilling device with adjustable axial force according to claim 2, characterized in that: The drilling mechanism (2) comprises a spindle motor (21), a sliding seat (22), an adapter seat (23) and a drill bit (24); the sliding seat (22) is detachably connected to a connecting block (43) and is slidably mounted on a mounting seat (1); the spindle motor (21) and a force sensor (3) are respectively mounted on two ends of the sliding seat (22); the adapter seat (23) is mounted on the force sensor (3); the drill bit (24) is rotatably mounted on the adapter seat (23); the spindle motor (21) is connected to the drill bit (24) via a transmission assembly (25); and the transmission assembly (25) is rotatably penetrated through the sliding seat (22), the force sensor (3) and the adapter seat (23).

4. The manual drilling device with adjustable axial force according to claim 3, characterized in that: The mounting seat (1) is provided with a motor support (11) and a screw support (12); the feed motor (41) is mounted on the motor support (11); both ends of the screw support (12) are provided with screw support seats (121) for mounting a screw (42); the screw (42) is rotatably mounted on the screw support seat (121).

5. The manual drilling device with adjustable axial force according to claim 4, characterized in that: The screw rod support (12) is provided with a guide groove (122), and the sliding seat (22) is slidably arranged in the guide groove (122).

6. The manual drilling device with adjustable axial force according to claim 3, characterized in that: The transmission assembly (25) comprises a motor connecting rod (251), a drill connecting rod (252) and a transfer rod (253); one end of the motor connecting rod (251) is connected to the output end of the spindle motor (21), and the other end is connected to the drill connecting rod (252) via a linear motion bearing (254); the drill (24) is detachably connected to the drill connecting rod (252) via the transfer rod (253).

7. The manual drilling device with adjustable axial force according to claim 6, characterized in that: A bearing seat (26) is provided on the transfer seat (23), and the transfer rod (253) is connected to the bearing seat (26).

8. The manual drilling device with adjustable axial force according to claim 6, characterized in that: The screw rod (42) is a ball screw, and the motor connecting rod (251) and the drill connecting rod (252) are both provided with a semicircular groove (255) for accommodating a ball in a linear motion bearing (254).

9. The manual drilling device with adjustable axial force according to any one of claims 2 to 8, characterized in that: The feed motor (41) and the screw rod (42) are connected via a coupling (44).

10. A drilling method using a manual drilling device with adjustable axial force according to any one of claims 1 to 9, characterized in that: The feed drive mechanism (4) drives the drilling mechanism (2) to feed and drill, and the drilling axial force of the drilling mechanism (2) is transmitted to the force sensor (3). When the force sensor (3) detects that the axial force at this time is greater than the critical axial force, the feed drive mechanism (4) is controlled to reduce the feed speed, thereby reducing the overall feed speed and ultimately reducing the axial force. When the force sensor (3) detects that the axial force at this time is less than the critical axial force, the feed drive mechanism (4) is controlled to increase the feed speed, thereby increasing the overall feed speed and ultimately increasing the axial force. The feed speed is continuously adjusted during the drilling process so that the overall feed speed is controlled at the feed speed corresponding to the critical axial force.

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