A boring tool

Abstract

The application discloses a boring tool, which comprises a main body, a rough-fine integrated adjusting mechanism, a tool seat and a tool blade; a radial mounting hole is arranged at the head of the main body, the rough-fine integrated adjusting mechanism is arranged in the mounting hole, the end of the rough-fine integrated adjusting mechanism is connected with the tool seat, the tool blade is connected with the tool seat, and the end of the main body is used for connecting a special numerical control tool handle for the boring tool. The rough-fine integrated adjusting mechanism is used for quickly moving the tool blade when quick adjustment of the diameter change is needed and slowly moving the tool blade when accurate adjustment of the diameter change is needed. The boring tool can realize quick rough adjustment and slow accurate adjustment simultaneously.

Description

Technical Field

[0001] This invention relates to the field of machining equipment technology, specifically to a boring tool. Background Technology

[0002] The adjustment mechanism of a boring bar head is entirely composed of threaded connections. The thread pitch and manufacturing precision directly affect the adjustment accuracy of the boring bar and the dimensional accuracy of the bored hole. A smaller pitch results in higher adjustment accuracy, but also a smaller thread size and lower strength. Furthermore, the closer the clearance between the internal and external threads is to zero, the smaller the adjustment error. Fine boring bars require adjustment accuracy below 0.01mm, resulting in extremely small thread sizes. Therefore, thread manufacturing is difficult and demands high-precision equipment and processes. Multiple processes are typically required to ensure the accuracy and strength of the precision transmission threads, significantly increasing the manufacturing cost of the boring bar due to the difficulty of thread manufacturing. Further improvements in the adjustment accuracy of boring bars have reached a bottleneck due to limitations in precision thread manufacturing. Summary of the Invention

[0003] To solve the above technical problems, the main objective of this invention is to provide a boring tool that can simultaneously achieve efficient coarse and fine adjustment.

[0004] To achieve the above objectives, the present invention employs the following technical solutions.

[0005] A boring tool includes a main boring tool body, an integrated roughing and finishing adjustment mechanism, a tool holder, and a cutting blade. The main body has a radial mounting hole at its head, in which the integrated roughing and finishing adjustment mechanism is mounted. The end of the integrated roughing and finishing adjustment mechanism is connected to the tool holder, and the cutting blade is connected to the tool holder. The integrated roughing and finishing adjustment mechanism is used to: quickly move the cutting blade when rapid diameter adjustment is required, and slowly move the cutting blade when precise diameter adjustment is required. The end of the main body is used to connect to the boring tool shank.

[0006] Optionally, the coarse and fine integrated adjustment mechanism includes a coarse adjustment moving block and a coarse adjustment screw sleeve. The coarse adjustment screw sleeve is rotatably connected to one end of the mounting hole. One end of the coarse adjustment moving block is threaded to the coarse adjustment screw sleeve, and the other end is connected to a fine adjustment component. The tool holder is connected to the fine adjustment component.

[0007] The outer wall of the coarse adjustment moving block is provided with a first guide groove along the axial direction, and the main body is provided with a first anti-rotation screw hole. A first guide bolt is provided in the first anti-rotation screw hole, and the head of the first guide bolt is inserted into the first guide groove. Rotating the coarse adjustment screw sleeve can drive the coarse adjustment moving block to move radially along the main body.

[0008] Optionally, the outer wall of the coarse adjustment screw sleeve is provided with a circumferential annular groove, and the main body is provided with a backstop screw hole facing the annular groove. A backstop bolt is provided in the backstop screw hole, and the head of the backstop bolt is inserted into the annular groove.

[0009] Optionally, the inner wall of the coarse adjustment spiral sleeve is provided with a first trapezoidal internal thread, and the outer wall of the coarse adjustment moving block is provided with a first trapezoidal external thread that matches the first trapezoidal internal thread.

[0010] Optionally, the fine-tuning assembly includes a fine-tuning knob, a double-ended bolt, and a fine-tuning moving block;

[0011] The first end of the double-ended bolt is provided with a second external thread, and the coarse adjustment moving block is provided with a second internal thread. The first end of the double-ended bolt is threadedly connected to the coarse adjustment moving block.

[0012] The second end of the double-ended bolt is provided with a third external thread, and the fine-adjusting moving block is provided with a third internal thread. The second end of the double-ended bolt is threadedly connected to the fine-adjusting moving block.

[0013] The second external thread and the third external thread have the same direction of rotation, and the pitch of the second external thread is less than the pitch of the third external thread;

[0014] The outer surface of the fine-tuning moving block is provided with a second guide groove, the handle is provided with a second anti-rotation screw hole, the second anti-rotation screw hole is provided with a second guide bolt, the head of the second guide bolt is inserted into the second guide groove, and the radial movement of the tool holder can be finely adjusted by rotating the fine-tuning knob 23;

[0015] The fine-tuning knob is used to drive the double-ended bolt to rotate.

[0016] Optionally, it also includes a limiting ring, which is threadedly connected to the coarse adjustment moving block, and the inner diameter of the limiting ring is smaller than the outer diameter of the second end of the double-ended bolt.

[0017] Optionally, the fine-tuning assembly further includes a insert plate; the first end of the double-ended bolt is provided with an axial lead groove, one end of the insert plate is inserted into the lead groove, and the other end is fixedly connected to the fine-tuning knob; the fine-tuning knob is used to drive the insert plate to rotate;

[0018] Optionally, the double-ended bolt is fitted with a compression spring, one end of which abuts against the fine-tuning moving block and the other end of which abuts against the coarse-tuning moving block.

[0019] Optionally, both the second and third external threads are left-hand threads.

[0020] Optionally, the tool holder is connected to the fine-tuning moving block by a third bolt.

[0021] Through the above technical solution, the integrated coarse and fine adjustment mechanism can quickly move the blade to the approximate position when rapid adjustment of the diameter is required, and can achieve precise adjustment of the blade when precise adjustment of the blade is required. Thus, rapid movement and precise adjustment can be achieved in one adjustment mechanism, solving the technical problem of the contradiction between precision and diameter adjustment in related technologies.

[0022] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a perspective view of one embodiment of the boring tool disclosed herein;

[0025] Figure 2 This is an exploded view of one embodiment of the boring tool disclosed herein;

[0026] Figure 3 This is a longitudinal cross-sectional view of one embodiment of the boring tool disclosed herein;

[0027] Figure 4 This is a cross-sectional view of one embodiment of the boring tool disclosed herein.

[0028] In the above diagram:

[0029] 1-Main body; 11-Mounting hole; 12-First anti-rotation screw hole; 13-Anti-reverse screw hole; 14-Second anti-rotation screw hole; 2-Integrated coarse and fine adjustment mechanism; 21-Coarse adjustment moving block; 211-First guide groove; 212-First trapezoidal external thread; 213-Second internal thread; 22-Coarse adjustment screw sleeve; 221-Annular groove; 222-First trapezoidal internal thread; 23-Fine adjustment knob; 24-Double-ended bolt; 241-Second external thread; 242-Third external thread; 243-Lead groove; 25-Fine adjustment moving block; 251-Third internal thread; 252-Second guide groove; 26-Insertion plate; 27-Compression spring; 28-Limit ring; 3-Tool holder; 4-Blade; 5-First guide bolt; 6-Anti-reverse bolt; 7-Second guide bolt; 8-First set screw; 9-Second set screw; 10-Third bolt. Detailed Implementation

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Specific details are set forth in the following description to provide a full understanding of the invention. However, the invention can be practiced in many ways other than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0032] In related technologies, the adjustment mechanism of boring bars is entirely composed of threaded fits. The pitch and manufacturing precision of the thread directly affect the adjustment precision of the boring bar and the dimensional accuracy of the bored hole. A smaller pitch results in higher adjustment precision, but also a smaller thread size and lower strength. Furthermore, the closer the clearance between the internal and external threads is to zero, the smaller the adjustment error. Fine boring bars require adjustment precision below 0.01mm, resulting in extremely small thread sizes. Therefore, thread manufacturing is difficult and demands high-precision equipment and processes. Multiple processes are typically required to ensure the accuracy and strength of the precision transmission thread, significantly increasing the manufacturing cost of the boring bar due to the difficulty of thread manufacturing. Further improvements in the adjustment precision of boring bars have reached a bottleneck due to limitations in precision thread manufacturing.

[0033] According to exemplary embodiments of this disclosure, please refer to Figure 1 and Figure 2 A boring tool is provided, comprising a main body 1, a roughing and finishing integrated adjustment mechanism 2, a tool holder 3, and a cutting tool 4; the head of the main body 1 is provided with a radial mounting hole 11, the roughing and finishing integrated adjustment mechanism 2 is installed in the mounting hole 11, the end of the roughing and finishing integrated adjustment mechanism 2 is connected to the tool holder 3, and the cutting tool 4 is connected to the tool holder 3; the roughing and finishing integrated adjustment mechanism 2 is used to: quickly move the cutting tool 4 when a rapid adjustment of the diameter is required, and slowly move the cutting tool 4 when a precise adjustment of the diameter is required.

[0034] In the above technical solution, the coarse and fine integrated adjustment mechanism 2 can quickly move the blade 4 to the approximate position when rapid adjustment of the diameter is required, and can achieve fine adjustment of the blade 4 when precise adjustment of the blade 4 is required. Thus, rapid movement and fine adjustment can be achieved in one adjustment mechanism, solving the technical problem of the contradiction between precision and diameter adjustment in related technologies.

[0035] According to exemplary embodiments of this disclosure, please refer to Figure 2The coarse and fine integrated adjustment mechanism 2 may include a coarse adjustment moving block 21 and a coarse adjustment screw sleeve 22. The coarse adjustment screw sleeve 22 is rotatably connected to one end of the mounting hole 11. One end of the coarse adjustment moving block 21 is threadedly connected to the coarse adjustment screw sleeve 22, and the other end is connected to the fine adjustment component. The tool holder 3 is connected to the fine adjustment component. The outer wall of the coarse adjustment moving block 21 is provided with a first guide groove 211 along the axial direction. The main body 1 is provided with a first anti-rotation screw hole 12. A first guide bolt 5 is provided in the first anti-rotation screw hole 12. The head of the first guide bolt 5 is inserted into the first guide groove 211. Rotating the coarse adjustment screw sleeve 22 can drive the coarse adjustment moving block 21 to move radially along the main body 1.

[0036] In the above technical solution, the coarse adjustment moving block 21 and the coarse adjustment screw sleeve 22 constitute a screw nut mechanism. Rotating the coarse adjustment screw sleeve 22 and restricting the rotation of the coarse adjustment moving block 21 can drive the coarse adjustment moving block 21 to move linearly, thereby realizing the rapid adjustment and change of diameter of the tool holder 3 and the blade 4, i.e., rapid coarse adjustment.

[0037] According to exemplary embodiments of this disclosure, please refer to Figure 2 The outer wall of the coarse adjustment screw sleeve 22 is provided with a circumferential annular groove 221, and the main body 1 is provided with a locking screw hole 13 facing the annular groove 221. A locking bolt 6 is provided in the locking screw hole 13, and the head of the locking bolt 6 is inserted into the annular groove 221. In this way, when the coarse adjustment screw sleeve 22 is rotated, the coarse adjustment screw sleeve 22 can only rotate and cannot move within the mounting hole 11.

[0038] According to exemplary embodiments of this disclosure, please refer to Figure 2 and Figure 3 The inner wall of the coarse adjustment screw sleeve 22 is provided with a first trapezoidal internal thread 222, and the outer wall of the coarse adjustment moving block 21 is provided with a first trapezoidal external thread 212 that matches the first trapezoidal internal thread 222.

[0039] According to exemplary embodiments of this disclosure, please refer to Figure 2 and Figure 3The fine-tuning assembly includes a fine-tuning knob 23, a double-ended bolt 24, and a fine-tuning moving block 25; the first end of the double-ended bolt 24 is provided with a second external thread 241, and the coarse-tuning moving block 21 is provided with a second internal thread 213, the first end of the double-ended bolt 24 is threadedly connected to the coarse-tuning moving block 21; the second end of the double-ended bolt 24 is provided with a third external thread 242, and the fine-tuning moving block 25 is provided with a third internal thread 251, the second end of the double-ended bolt 24 is threadedly connected to the fine-tuning moving block 25; the second... The external thread 241 and the third external thread 242 have the same direction of rotation, and the pitch of the second external thread 241 is smaller than the pitch of the third external thread 242; the outer surface of the fine adjustment moving block 25 is provided with a second guide groove 252, and the handle is provided with a second anti-rotation screw hole 14. A second guide bolt 7 is provided in the second anti-rotation screw hole 14, and the head of the second guide bolt 7 is inserted into the second guide groove 252. Rotating the fine adjustment knob 23 can finely adjust the radial movement of the tool holder 3; the fine adjustment knob 23 is used to drive the double-ended bolt 24 to rotate.

[0040] In the above technical solution, the first end of the double-ended bolt 24 and the coarse adjustment screw sleeve 22 constitute a screw-nut mechanism, driving the double-ended bolt 24 to rotate. Since the first guide bolt 5 is inserted into the first guide groove 211, it restricts the rotation of the coarse adjustment moving block 21. Also, since the double-ended bolt 24 can only rotate on its own and cannot move, the coarse adjustment moving block 21 moves. At the same time, the second end of the double-ended bolt 24 and the fine adjustment knob 23 also constitute a screw-nut mechanism, driving the double-ended bolt 24 to rotate. While the second guide bolt 7 restricts the movement of the fine adjustment moving block 25, the fine adjustment moving block 25 can only move axially along the mounting hole 11.

[0041] Meanwhile, because the second external thread 241 and the third external thread 242 have the same direction of rotation, the coarse adjustment moving block 21 and the fine adjustment moving block 25 move in opposite directions. Furthermore, since the pitch of the second external thread 241 is smaller than the pitch of the third thread, the actual displacement of the blade 4 is equal to the displacement of the stud bolt 24 minus the displacement of the fine adjustment moving block 25. For example, if the pitch of the second external thread 241 is 1.25mm and the pitch of the third external thread 242 is 1.5mm, rotating the stud bolt 24 one revolution moves it 1.25mm, the fine adjustment moving block 25 moves it 1.5mm in the opposite direction, and the actual movement distance of the blade 4 is 0.25mm. That is, the fine adjustment of the blade 4 is achieved through the large pitch of the stud bolt 24.

[0042] According to exemplary embodiments of this disclosure, reference is made to Figure 2 and Figure 3 It also includes a limiting ring 28, which is threaded into the coarse adjustment moving block 21. The inner diameter of the limiting ring 28 is smaller than the outer diameter of the second end of the double-ended bolt 24. The limiting ring 28 is used to limit the double-ended bolt 24 and prevent it from being over-screwed into the coarse adjustment screw sleeve 22.

[0043] According to exemplary embodiments of this disclosure, reference is made to Figure 2 and Figure 3 The fine-tuning assembly also includes a plate 26; the first end of the double-ended bolt 24 is provided with an axial lead groove 243, one end of the plate 26 is inserted into the lead groove 243, and the other end is fixedly connected to the fine-tuning knob 23; the fine-tuning knob 23 is used to drive the plate 26 to rotate.

[0044] In the above scheme, during the coarse adjustment process, the coarse adjustment moving block 21 needs to move, which drives the fine adjustment component to move, that is, there will be relative movement between the insert plate 26 and the double-ended bolt 24. During the fine adjustment process, the double-ended bolt 24 rotates, and the double-ended bolt 24 and the insert plate 26 rotate simultaneously, with relative translational movement between the double-ended bolt 24 and the insert plate 26. In order to satisfy both states at the same time, the insert plate 26 is provided with a lead groove 243. The insert plate 26 is inserted into the lead groove 243. During the coarse adjustment, the double-ended bolt 24 can move relative to the insert plate 26. During the fine adjustment, the rotation of the insert plate 26 drives the double-ended bolt 24 to rotate, and the insert plate 26 and the double-ended bolt 24 move with relative translational movement.

[0045] According to exemplary embodiments of this disclosure, reference is made to Figure 2 and Figure 3 The double-ended bolt 24 is fitted with a compression spring 27. One end of the compression spring 27 abuts against the fine-adjustment moving block 25, and the other end abuts against the coarse-adjustment moving block 21. This eliminates the backlash between the threads.

[0046] According to an exemplary embodiment of this disclosure, both the second external thread 241 and the third external thread 242 are left-hand threads. In the above technical solution, for the double-ended bolt 24, rotating the fine-tuning knob 23 clockwise causes the double-ended bolt 24 to move toward the fine-tuning knob 23. During the fine-tuning process, the coarse-tuning moving block 21 is locked by the first set screw 8 and cannot move. For the fine-tuning moving block 25, rotating the double-ended bolt 24 clockwise causes the fine-tuning moving block 25 to move away from the fine-tuning knob 23. The movement direction of the double-ended bolt 24 is reversed, and the fine-tuning moving block 25 moves toward the extension direction of the tool holder 3. The actual moving distance of the tool holder 3 is equal to the moving distance of the fine adjustment moving block 25 minus the moving distance of the double-ended bolt 24. Since the pitch of the third external thread 242 is greater than the pitch of the second external thread 241, the tool holder 3 will eventually move in the direction of extension. Rotating the fine adjustment knob 23 clockwise increases the extension length of the tool holder 3, which is more in line with the operating habits of general mechanical equipment. Therefore, the second external thread 241 and the third external thread 242 need to be set to left-hand.

[0047] According to an exemplary embodiment of this disclosure, the tool holder 3 is connected to the fine-tuning moving block 25 by a third bolt 10.

[0048] According to exemplary embodiments of this disclosure, reference is made to Figures 1 to 4The working principle of this disclosure is as follows: When the boring tool needs to adjust the insert 4, taking the outward movement of the insert 4 as an example, first, turn the fine adjustment knob 23 counterclockwise to the limit to zero the fine adjustment part, then rotate the coarse adjustment screw sleeve 22. The coarse adjustment screw sleeve 22 drives the tool holder 3, the fine adjustment moving block 25, the double-ended bolt 24, and the coarse adjustment moving block 21 to move together at the speed of moving the pitch of the first trapezoidal external thread 212 per revolution. When the insert 4 moves to a size slightly smaller than the target size (less than 1mm), the first set screw 8 is used to circumferentially lock the coarse adjustment moving block. Move block 21, then perform fine adjustment. Use a hex wrench to rotate the fine adjustment knob 23 clockwise. The double-ended bolt 24 moves closer to the coarse adjustment screw sleeve 22, while the fine adjustment moving block 25 moves away from the fine adjustment knob 23. Since the pitch of the second external thread 241 is smaller than the pitch of the third external thread 242, the combined movement of the tool holder 3 and the cutting tool 4 is a movement away from the fine adjustment knob 23, and the speed of the combined movement is the difference between the speed of the fine adjustment moving block 25 and the speed of the double-ended bolt 24, thus achieving the purpose of fine adjustment. After adjustment, tighten the fine adjustment moving block 25 with the second set screw 9, and then the machining operation can be performed.

[0049] Although the present invention has been described in detail in this specification with general description and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the present invention are within the scope of protection claimed by the present invention.

Claims

1. A boring tool, characterized in that, The device includes a main body (1), a roughing and finishing integrated adjustment mechanism (2), a tool holder (3), and a cutting tool (4). The head of the main body (1) is provided with a radial mounting hole (11). The roughing and finishing integrated adjustment mechanism (2) is installed in the mounting hole (11). The end of the roughing and finishing integrated adjustment mechanism (2) is connected to the tool holder (3). The cutting tool (4) is connected to the tool holder (3). The roughing and finishing integrated adjustment mechanism (2) is used to: move the cutting tool (4) quickly when a rapid adjustment of the diameter is required, and move the cutting tool (4) slowly when a precise adjustment of the diameter is required. The end of the main body (1) is used to connect to the boring tool holder. The coarse and fine integrated adjustment mechanism (2) includes a coarse adjustment moving block (21) and a coarse adjustment screw sleeve (22). The coarse adjustment screw sleeve (22) is rotatably connected to one end of the mounting hole (11). One end of the coarse adjustment moving block (21) is threaded to the coarse adjustment screw sleeve (22), and the other end is connected to a fine adjustment component. The tool holder (3) is connected to the fine adjustment component. The outer wall of the coarse adjustment moving block (21) is provided with a first guide groove (211) along the axial direction. The main body (1) is provided with a first anti-rotation screw hole (12). A first guide bolt (5) is provided in the first anti-rotation screw hole (12). The head of the first guide bolt (5) is inserted into the first guide groove (211). Rotating the coarse adjustment screw sleeve (22) can drive the coarse adjustment moving block (21) to move radially along the main body (1). The outer wall of the coarse adjustment screw sleeve (22) is provided with an annular groove (221) along the circumferential direction. The main body (1) is provided with a back-locking screw hole (13) facing the annular groove (221). A back-locking bolt (6) is provided in the back-locking screw hole (13), and the head of the back-locking bolt (6) is inserted into the annular groove (221). The inner wall of the coarse adjustment screw sleeve (22) is provided with a first trapezoidal internal thread (222), and the outer wall of the coarse adjustment moving block (21) is provided with a first trapezoidal external thread (212) that matches the first trapezoidal internal thread (222). The fine-tuning assembly includes a fine-tuning knob (23), a double-ended bolt (24), and a fine-tuning moving block (25). The first end of the double-ended bolt (24) is provided with a second external thread (241), and the coarse adjustment moving block (21) is provided with a second internal thread (213). The first end of the double-ended bolt (24) is threadedly connected to the coarse adjustment moving block (21). The second end of the double-ended bolt (24) is provided with a third external thread (242), and the fine adjustment moving block (25) is provided with a third internal thread (251). The second end of the double-ended bolt (24) is threadedly connected to the fine adjustment moving block (25). The second external thread (241) and the third external thread (242) have the same direction of rotation, and the pitch of the second external thread (241) is smaller than the pitch of the third external thread (242); The outer surface of the fine adjustment moving block (25) is provided with a second guide groove (252), and the main body is provided with a second anti-rotation screw hole (14). A second guide bolt (7) is provided in the second anti-rotation screw hole (14). The head of the second guide bolt (7) is inserted into the second guide groove (252). The radial movement of the tool holder (3) can be finely adjusted by rotating the fine adjustment knob (23). The fine adjustment knob (23) is used to drive the double-ended bolt (24) to rotate.

2. The boring tool according to claim 1, characterized in that, It also includes a limiting ring (28), which is threadedly connected to the coarse adjustment moving block (21), and the inner diameter of the limiting ring (28) is smaller than the outer diameter of the second end of the double-ended bolt (24).

3. The boring tool according to claim 2, characterized in that, The fine-tuning assembly also includes a insert plate (26); the first end of the double-headed bolt (24) is provided with an axial lead groove (243), one end of the insert plate (26) is inserted into the lead groove (243), and the other end is fixedly connected to the fine-tuning knob (23); the fine-tuning knob (23) is used to drive the insert plate (26) to rotate.

4. The boring tool according to claim 3, characterized in that, The double-ended bolt (24) is fitted with a compression spring (27), one end of which abuts against the fine adjustment moving block (25), and the other end abuts against the coarse adjustment moving block (21).

5. The boring tool according to claim 4, characterized in that, The second external thread (241) and the third external thread (242) are both left-hand threads.

6. The boring tool according to claim 5, characterized in that, The tool holder (3) is connected to the fine-tuning moving block (25) by a third bolt (10).

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