A boring bar arm structure capable of absorbing vibration impact

Abstract

The present application belongs to the technical field of boring tool arm structure, and particularly relates to a boring tool arm structure capable of absorbing vibration impact, comprising a rotary support assembly, a swing clutch assembly, a retraction locking assembly, a driving assembly and a boring tool assembly, wherein the rotary support assembly is arranged on the driving assembly, the swing clutch assembly is slidingly arranged in the rotary support assembly, the retraction locking assembly is symmetrically arranged between the rotary support assembly and the swing clutch assembly, and the boring tool assembly is arranged at the end of the swing clutch assembly. The present application designs a buffering mechanism to replace an integrated tool bar. When the radial load is too large, the swing mechanism can absorb the vibration and move away from the workpiece. In addition, the present application proposes the swing clutch assembly. When the tool bar is deflected, the clutch structure can cut off the power transmission between the tool bar and the motor, which can significantly reduce the safety hazards and leave sufficient operation time for shutdown and manual reset.

Description

Technical Field

[0001] This invention belongs to the technical field of boring bar arm structure, specifically referring to a boring bar arm structure that can absorb vibration and impact. Background Technology

[0002] Boring generally involves inserting a tool into the workpiece for machining. During machining, the tool holder is mainly subjected to radial load. To ensure accuracy, the tool holder is generally made of a material with high hardness. However, materials with high hardness generally have poor toughness, so the tool holder is prone to breakage during actual machining.

[0003] In addition to improving materials, this invention, under the premise of limited material properties, can effectively solve the problems of easy breakage of the tool holder, high wear and high cost during processing by improving the structure of the tool holder. Summary of the Invention

[0004] To address the above issues and overcome the shortcomings of existing technologies, this invention provides a boring bar arm structure capable of absorbing vibration and impact. This solution designs a buffer mechanism to replace the integrated tool holder. When the radial load is too large, the vibration is absorbed by swinging and the tool holder moves away from the workpiece. It can then be manually reset and reprocessed, avoiding economic losses and personal risks caused by the direct breakage of the tool or tool holder. During boring, the tool may rotate. If the tool holder wobbles, the wobble will increase under the action of centrifugal force, which may interfere with the workpiece and scratch it.

[0005] To address this issue, this invention proposes a swing clutch assembly. While the tool holder swings, the clutch structure cuts off the power transmission between the tool holder and the motor, which can significantly reduce safety hazards and provide sufficient operation time for stopping and manual reset.

[0006] The technical solution adopted by the present invention is as follows: The present invention proposes a boring arm structure capable of absorbing vibration and shock, including a rotary support assembly, a swing clutch assembly, a retraction locking assembly, a drive assembly, and a boring tool assembly. The rotary support assembly is disposed on the drive assembly, the swing clutch assembly is slidably disposed in the rotary support assembly, the retraction locking assembly is symmetrically disposed between the rotary support assembly and the swing clutch assembly, and the boring tool assembly is disposed at the end of the swing clutch assembly.

[0007] The swing clutch assembly includes a sliding clutch and a tool holder base, which are hinged together. The tool holder base has an outer arc-shaped surface that matches the rotary support assembly. When the tool holder base swings radially, it will cause the sliding clutch to slide axially.

[0008] Furthermore, the rotary support assembly includes a limiting block, the end of which is provided with an inner arc surface that matches the outer arc surface; the sliding clutch is provided with an end hole; the tool holder base is also provided with a fork portion; the swing clutch assembly also includes an end pin, and the end hole and the fork portion are hinged together by the end pin.

[0009] Preferably, the oscillating clutch assembly further includes a buffer spring disposed between the sliding clutch and the limit block.

[0010] Furthermore, the rotating support assembly also includes a fixed bracket, which is fixedly connected to the drive assembly, and the limiting block is rotatably disposed in the fixed bracket.

[0011] Furthermore, the retraction locking assembly includes a fixed seat, a locking steel ball, and a locking spring. The fixed seat is fixedly connected between the limiting blocks. The fixed seat is provided with a hemispherical groove that matches the locking steel ball. The sliding clutch is provided with a side hole. The locking steel ball is slidably disposed in the side hole. The locking spring is disposed between the side hole and the locking steel ball.

[0012] Furthermore, the drive assembly includes a drive motor and a machine tool side plate, wherein the drive motor is disposed on the machine tool side plate and the fixed bracket is disposed on the machine tool side plate.

[0013] Preferably, the drive motor is provided with an output shaft, and the sliding clutch is provided with an internal hexagonal connector, which is engaged and slidably disposed on the output shaft.

[0014] Furthermore, the boring tool assembly includes a tool shank, a tool head, and a mounting pin. The tool shank is mounted on the tool holder base and is coaxially arranged with the tool holder base. The tool shank is provided with a mounting groove, and the tool head is detachably mounted in the mounting groove. The tool head and the tool shank are connected by a mounting pin.

[0015] Preferably, the retraction locking assembly includes a fixed magnet and a sliding magnet, the fixed magnet being fixedly connected between the limiting blocks, the sliding magnet being fixedly connected to the sliding clutch, and there is a magnetic attraction between the fixed magnet and the sliding magnet.

[0016] The beneficial effects achieved by the present invention using the above structure are as follows:

[0017] (1) When the radial force on the tool holder is too large, on the one hand, it can avoid the tool by swinging away from the workpiece, and on the other hand, it can cut off the rotational power of the tool holder by separating the internal hexagonal connector and the output shaft, thereby preventing the eccentric tool holder from continuing to swing and damaging the workpiece due to rotational motion.

[0018] (2) By using the curved surfaces of the inner arc surface and the outer arc surface, when the angle of the tool holder base changes, the sliding clutch is pulled by the end pin, thereby separating the internal hexagonal connector and the output shaft and cutting off the power transmission.

[0019] (3) The buffer spring is initially stretched to a small extent. Therefore, after the sliding clutch slides, it will remain at the free length of the buffer spring to avoid the problem of the tool head hitting the workpiece when the tool holder is fully reset.

[0020] (4) As the sliding clutch slides, the compression of the buffer spring gradually increases, which not only prevents the yaw of the tool bar from being too large, but also forms a buffer between the sliding clutch and the limit block, preventing rigid impact between the sliding clutch and the limit block.

[0021] (5) The limit block has resistance when rotating in the fixed bracket. Therefore, when the internal hexagonal connector is separated from the output shaft, the limit block can quickly stop rotating, thereby avoiding damage to the workpiece by the boring tool assembly.

[0022] (6) The locking steel ball can lock and limit the initial position of the tool bar, so that the tool bar can withstand a certain amount of radial force. When the radial force reaches a certain value, the sliding clutch will slide. However, after the sliding clutch starts to slide, the sliding resistance of the sliding clutch will decrease rapidly, so that the tool bar can deflect the impact force through its own swing.

[0023] (7) Both the fixed magnet and the sliding magnet can achieve the locking and limiting function of the initial position, and can also quickly reduce the sliding resistance after the sliding clutch starts to slide. Attached Figure Description

[0024] Figure 1 This is a perspective view of a boring bar arm structure capable of absorbing vibration and shock, as proposed in this invention.

[0025] Figure 2 This is a front view of a boring bar arm structure capable of absorbing vibration and shock, as proposed in this invention.

[0026] Figure 3 This is a left view of a boring bar arm structure capable of absorbing vibration and shock according to the present invention.

[0027] Figure 4 for Figure 2 A cross-sectional view along the cutting line AA;

[0028] Figure 5 for Figure 2 A cross-sectional view along the cutting line BB;

[0029] Figure 6 for Figure 3A three-dimensional sectional view along the section line CC;

[0030] Figure 7 This is an exploded structural diagram of a boring bar arm structure capable of absorbing vibration and shock, as proposed in this invention.

[0031] Figure 8 for Figure 4 A magnified view of a section at point I;

[0032] Figure 9 for Figure 5 Enlarged view of a section at point II;

[0033] Figure 10 for Figure 7 A magnified view of a section at point III.

[0034] Among them, 1. Rotary support assembly, 2. Swing clutch assembly, 3. Retraction locking assembly, 4. Drive assembly, 5. Boring tool assembly, 11. Fixed bracket, 12. Limit block, 21. Sliding clutch, 22. Tool post base, 23. End pin, 24. Buffer spring, 31. Fixed magnet, 32. Sliding magnet, 33. Fixed seat, 34. Locking steel ball, 35. Locking spring, 41. Drive motor, 42. Machine tool side plate, 51. Tool bar, 52. Tool head, 53. Mounting pin, 121. Inner arc surface, 211. Hexagonal socket connection, 212. End hole, 213. Side hole, 221. Fork part, 222. Outer arc surface, 331. Hemispherical groove, 411. Output shaft, 511. Mounting groove.

[0035] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] like Figures 1-10 As shown, the present invention proposes a boring bar structure capable of absorbing vibration and shock, including a rotary support assembly 1, a swing clutch assembly 2, a retraction locking assembly 3, a drive assembly 4, and a boring tool assembly 5. The rotary support assembly 1 is disposed on the drive assembly 4, the swing clutch assembly 2 is slidably disposed in the rotary support assembly 1, the retraction locking assembly 3 is symmetrically disposed between the rotary support assembly 1 and the swing clutch assembly 2, and the boring tool assembly 5 is disposed at the end of the swing clutch assembly 2.

[0039] The swing clutch assembly 2 includes a sliding clutch 21 and a tool holder base 22. The sliding clutch 21 and the tool holder base 22 are hinged together. The tool holder base 22 is provided with an outer arc-shaped surface 222 that matches the rotary support assembly 1. When the tool holder base 22 swings radially, it will drive the sliding clutch 21 to slide axially.

[0040] When the radial force on the tool holder 51 is too large, it can avoid the tool from the workpiece by swinging itself. At the same time, it can cut off the rotational power of the tool holder 51 by separating the internal hexagonal connector 211 and the output shaft 411, thereby preventing the eccentric tool holder 51 from continuing to swing due to rotational motion and damaging the workpiece.

[0041] The rotating support assembly 1 includes a limiting block 12, the end of which is provided with an inner arc surface 121 that matches the outer arc surface 222. The sliding clutch 21 is provided with an end hole 212. The tool holder base 22 is also provided with a fork portion 221. The swing clutch assembly 2 also includes an end pin 23. The end hole 212 and the fork portion 221 are hinged together by the end pin 23.

[0042] By using the curved surfaces of the inner arc surface 121 and the outer arc surface 222, when the angle of the tool holder base 22 changes, the sliding clutch 21 is pulled by the end pin 23, thereby separating the internal hexagonal connector 211 from the output shaft 411 and cutting off the power transmission.

[0043] The swing clutch assembly 2 also includes a buffer spring 24, which is located between the sliding clutch 21 and the limit block 12.

[0044] The buffer spring 24 is initially in a slightly stretched state, so it will remain at the free length of the buffer spring 24 after the sliding clutch 21 slides, thus avoiding the problem of the cutter head 52 hitting the workpiece when the cutter bar 51 is fully reset.

[0045] As the sliding clutch 21 slides, the compression of the buffer spring 24 gradually increases, which not only prevents the yaw of the cutter bar 51 from being too large, but also forms a buffer between the sliding clutch 21 and the limit block 12, preventing rigid impact between the sliding clutch 21 and the limit block 12.

[0046] The rotating support assembly 1 also includes a fixed bracket 11, which is fixedly connected to the drive assembly 4, and the limiting block 12 is rotatably disposed in the fixed bracket 11.

[0047] The limiting block 12 experiences resistance when rotating within the fixed bracket 11. Therefore, once the internal hexagonal connector 211 separates from the output shaft 411, the limiting block 12 can quickly stop rotating, thereby preventing the boring tool assembly 5 from damaging the workpiece.

[0048] The retraction locking assembly 3 includes a fixed base 33, a locking steel ball 34, and a locking spring 35. The fixed base 33 is fixedly connected between the limiting blocks 12. The fixed base 33 is provided with a hemispherical groove 331 that matches the locking steel ball 34. The sliding clutch 21 is provided with a side hole 213. The locking steel ball 34 is slidably disposed in the side hole 213. The locking spring 35 is disposed between the side hole 213 and the locking steel ball 34.

[0049] The locking steel ball 34 can lock and limit the initial position of the tool bar 51, so that the tool bar 51 can withstand a certain amount of radial force. When the radial force reaches a certain value, the sliding clutch 21 will slide. However, after the sliding clutch 21 starts to slide, the sliding resistance of the sliding clutch 21 will decrease rapidly, so as to allow the tool bar 51 to deflect the impact force through its own swing.

[0050] The drive assembly 4 includes a drive motor 41 and a machine tool side plate 42. The drive motor 41 is mounted on the machine tool side plate 42, and the fixed bracket 11 is mounted on the machine tool side plate 42.

[0051] The drive motor 41 is provided with an output shaft 411, and the sliding clutch 21 is provided with an internal hexagonal connector 211, which is engaged and slidably mounted on the output shaft 411.

[0052] The boring tool assembly 5 includes a tool holder 51, a tool head 52, and a mounting pin 53. The tool holder 51 is mounted on the tool holder base 22 and is coaxial with the tool holder base 22. The tool holder 51 is provided with a mounting groove 511. The tool head 52 is detachably mounted in the mounting groove 511. The tool head 52 and the tool holder 51 are connected by the mounting pin 53.

[0053] The retraction locking assembly 3 includes a fixed magnet 31 and a sliding magnet 32. The fixed magnet 31 is fixedly connected to the limiting blocks 12, and the sliding magnet 32 ​​is fixedly connected to the sliding clutch 21. There is a magnetic attraction between the fixed magnet 31 and the sliding magnet 32.

[0054] Both the fixed magnet 31 and the sliding magnet 32 ​​can achieve the locking and limiting function of the initial position, and can also quickly reduce the sliding resistance after the sliding clutch 21 starts to slide.

[0055] In actual use, in the initial state, the internal hexagonal connector 211 is engaged with the output shaft 411, and the locking steel ball 34 is located in the hemispherical groove 331. At this time, the drive motor 41 can rotate with the sliding clutch 21, thereby rotating the limit block 12 and the tool holder 51 slowly (the rotation of the tool is mainly used for the machining of helical rifling or the adjustment of the tool angle, so the rotation speed is relatively slow). Combined with the rapid rotational motion of the workpiece itself and the axial feed, the boring machining of the workpiece is realized.

[0056] Due to the obstruction of the locking steel ball 34, the sliding clutch 21 needs to overcome a large resistance to slide in the limit block 12, so the tool bar 51 has the ability to withstand radial force.

[0057] During the boring process, if the radial force on the tool holder 51 is too large, the tool holder 51 will swing away from the workpiece. Due to the cooperation and limiting of the inner arc surface 121 and the outer arc surface 222, the tool holder 51 will pull the sliding clutch 21 to slide outward while swinging.

[0058] At this time, the locking steel ball 34 retracts into the side hole 213 over the elastic force of the locking spring 35, and the axial sliding resistance of the sliding clutch 21 is reduced sharply. Even if the workpiece has been separated from the tool and the tool is no longer subjected to radial force, the tool holder 51 will not reset.

[0059] The buffer spring 24 is initially stretched slightly. After the sliding clutch 21 starts to slide, as the compression of the buffer spring 24 increases, the sliding resistance of the sliding clutch 21 also increases. This not only prevents the sway of the tool bar 51 from being too large, but also forms a buffer between the sliding clutch 21 and the limit block 12, preventing rigid impact between the sliding clutch 21 and the limit block 12.

[0060] The limiting block 12 experiences resistance when rotating within the fixed bracket 11. Therefore, once the internal hexagonal connector 211 separates from the output shaft 411, the limiting block 12 can quickly stop rotating. After the sliding clutch 21 begins to slide, it will eventually stop at the free length of the buffer spring 24, thus avoiding the problem of the tool automatically resetting and impacting the workpiece.

[0061] After the above-mentioned unexpected situation occurs, since the power transmission between the slip clutch 21 and the output shaft 411 has been cut off, the drive motor 41 can be manually shut down or a sensor can be added to detect the position of the slip clutch 21 and automatically shut down.

[0062] After stopping the machine, manually rotate the tool holder 51 and push the sliding clutch 21 back into the limit block 12. A crisp mechanical locking sound is heard, indicating that the locking steel ball 34 has re-entered the hemispherical groove 331. After the reset is completed, the machining can be restarted.

[0063] As another new embodiment of the present invention: the fixed seat 33, the locking steel ball 34, the locking spring 35, and the side hole 213 feature can be replaced by the fixed magnet 31 and the sliding magnet 32; in the initial state, the fixed magnet 31 and the sliding magnet 32 ​​are in contact and attract each other, maintaining the locking of the sliding clutch 21; when the axial tension of the sliding clutch 21 is too large, the sliding magnet 32 ​​separates from the fixed magnet 31, and the attraction force between the two can also be reduced quickly after the sliding magnet 32 ​​separates from the fixed magnet 31, allowing the tool holder 51 to relieve the force by swinging.

[0064] When manually reset, a crisp mechanical locking sound will be emitted the moment the fixed magnet 31 and the sliding magnet 32 ​​come into contact.

[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0066] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A boring bar arm structure capable of absorbing vibration and impact, characterized in that: It includes a rotary support assembly (1), a swing clutch assembly (2), a retraction locking assembly (3), a drive assembly (4), and a boring tool assembly (5). The rotary support assembly (1) is disposed on the drive assembly (4), the swing clutch assembly (2) is slidably disposed in the rotary support assembly (1), the retraction locking assembly (3) is symmetrically disposed between the rotary support assembly (1) and the swing clutch assembly (2), and the boring tool assembly (5) is disposed at the end of the swing clutch assembly (2). The swing clutch assembly (2) includes a sliding clutch (21) and a tool holder base (22). The sliding clutch (21) and the tool holder base (22) are hinged together. The tool holder base (22) is provided with an outer arc surface (222) that matches the rotating support assembly (1). When the tool holder base (22) swings radially, it will drive the sliding clutch (21) to slide axially.

2. The boring bar arm structure capable of absorbing vibration and impact according to claim 1, characterized in that: The rotating support assembly (1) includes a limiting block (12), the end of which is provided with an inner arc surface (121) that matches the outer arc surface (222). The sliding clutch (21) is provided with an end hole (212). The tool holder base (22) is also provided with a fork portion (221). The swing clutch assembly (2) also includes an end pin (23). The end hole (212) and the fork portion (221) are hinged together by the end pin (23).

3. The boring bar arm structure capable of absorbing vibration and impact according to claim 2, characterized in that: The swing clutch assembly (2) also includes a buffer spring (24), which is disposed between the sliding clutch (21) and the limit block (12).

4. A boring bar arm structure capable of absorbing vibration and impact according to claim 3, characterized in that: The rotating support assembly (1) further includes a fixed bracket (11), which is fixedly connected to the drive assembly (4), and the limiting block (12) is rotatably disposed in the fixed bracket (11).

5. A boring bar arm structure capable of absorbing vibration and impact according to claim 4, characterized in that: The retraction locking assembly (3) includes a fixed seat (33), a locking ball (34) and a locking spring (35). The fixed seat (33) is fixed between the limiting blocks (12). The fixed seat (33) is provided with a hemispherical groove (331) that matches the locking ball (34). The sliding clutch (21) is provided with a side hole (213). The locking ball (34) is slidably disposed in the side hole (213). The locking spring (35) is disposed between the side hole (213) and the locking ball (34).

6. A boring bar arm structure capable of absorbing vibration and impact according to claim 5, characterized in that: The drive assembly (4) includes a drive motor (41) and a machine tool side plate (42). The drive motor (41) is mounted on the machine tool side plate (42), and the fixed bracket (11) is mounted on the machine tool side plate (42).

7. A boring bar arm structure capable of absorbing vibration and impact according to claim 6, characterized in that: The drive motor (41) is provided with an output shaft (411), and the sliding clutch (21) is provided with an internal hexagonal connector (211), which is engaged and slidably disposed on the output shaft (411).

8. A boring bar arm structure capable of absorbing vibration and impact according to claim 7, characterized in that: The boring tool assembly (5) includes a tool holder (51), a tool head (52), and a mounting pin (53). The tool holder (51) is mounted on the tool holder base (22) and is coaxial with the tool holder base (22). The tool holder (51) is provided with a mounting groove (511). The tool head (52) is detachably mounted in the mounting groove (511). The tool head (52) and the tool holder (51) are connected by the mounting pin (53).

9. A boring bar arm structure capable of absorbing vibration and impact according to claim 4, characterized in that: The retraction locking assembly (3) includes a fixed magnet (31) and a sliding magnet (32). The fixed magnet (31) is fixed between the limiting blocks (12), and the sliding magnet (32) is fixed on the sliding clutch (21). There is a magnetic attraction between the fixed magnet (31) and the sliding magnet (32).

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