A kind of PCBN cutter for high-speed cutting of nodular cast iron and cutting device

Abstract

The application discloses a nodular cast iron high-speed cutting PCBN cutter and a cutting device, and belongs to the technical field of nodular cast iron turning processing. The application comprises a workbench, a rotating table is rotationally connected to the top of the workbench, an expanding inner supporting mechanism is arranged on the top of the rotating table, an adaptive locking mechanism is arranged in the rotating table, the adaptive locking mechanism is used for automatically locking the position of the expanding inner supporting mechanism after the expanding inner supporting mechanism is lowered to the position, a driving arm is slidably installed on the top of the workbench, and a PCBN cutter is fixedly installed at the output end of the driving arm, the PCBN cutter is used for cutting a nodular cast iron brake disc workpiece, the inner wall of the brake disc of different inner diameters is automatically adapted through synchronous radial expansion of a push plate, self-adaptive centering and tensioning are realized, corresponding clamping claws do not need to be replaced for each kind of specification workpiece, thereby, the disassembly, reinstallation and re-centering operation during production change is completely avoided, eccentricity errors caused by manual adjustment are eliminated, and the clamping efficiency and machining consistency are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of ductile iron turning technology, and in particular to a PCBN cutting tool and cutting device for high-speed cutting of ductile iron. Background Technology

[0002] Ductile iron is a high-strength cast iron material that precipitates graphite in a spheroidal shape through spheroidization treatment. The spheroidal graphite in its microstructure effectively weakens the cutting effect of the matrix, thus combining the excellent casting properties of cast iron with the high strength and high toughness of steel. It is widely used in the manufacturing of mechanical parts that are subjected to impact and vibration.

[0003] Brake discs, as a core safety component of automotive braking systems, are typically made from ductile iron through a casting process. Because the brake surface requires high wear resistance, good thermal conductivity, and a stable coefficient of friction, brake discs must undergo precision machining after casting to achieve the flatness, roughness, and dimensional tolerances specified in the drawings. Currently, high-speed cutting technology (especially high-speed cutting with PCBN tools) has become the mainstream process for machining ductile iron brake discs. This process utilizes the extremely high hardness of PCBN tools (second only to diamond) and excellent red hardness (maintaining cutting ability at 800-1000℃) to perform dry cutting on the brake disc blank, thereby obtaining mirror-like surface quality and extremely high dimensional accuracy, while avoiding the environmental pollution problems caused by cutting fluid.

[0004] In high-speed machining, the clamping and fixing of brake disc blanks is a critical step. Existing technologies generally adopt the following clamping methods: for brake discs with ventilation grooves, wedge-shaped jaws are used to clamp into the ventilation grooves and tighten them from the inside; for ordinary disc brake discs, multi-jaw chucks are used to clamp the outer circle or inner hole. However, in practical applications, due to the wide variety of inner diameter specifications of ductile iron brake discs (different models and wheel hub sizes correspond to different inner diameters), traditional fixtures require changing the corresponding jaws for each inner diameter. The changeover process requires disassembly, reassembly, and readjustment of centering accuracy, resulting in long processing time, low efficiency, and difficulty in meeting the flexible needs of multi-variety, small-batch production. Summary of the Invention

[0005] The purpose of this invention is to solve the problems raised in the prior art, and to propose a PCBN cutting tool and cutting device for high-speed cutting of ductile iron.

[0006] To achieve the above objectives, the present invention employs a PCBN tool for high-speed cutting of ductile iron, comprising a worktable, a rotary table rotatably connected to the top of the worktable, an expansion inner support mechanism being provided on the top of the rotary table, an adaptive locking mechanism being provided inside the rotary table, the adaptive locking mechanism being used to automatically lock the position of the expansion inner support mechanism after it moves down into place, a drive arm being slidably mounted on the top of the worktable, and a PCBN tool being fixedly mounted on the output end of the drive arm, the PCBN tool being used to cut ductile iron brake disc workpieces;

[0007] The expansion internal support mechanism includes a lower pressure plate, and a lower pressure ring is fixedly connected to the bottom center of the lower pressure plate. A first spring is fixedly connected to the bottom of the lower pressure ring, and a bearing ring is fixedly connected to the end of the first spring away from the lower pressure ring. A plurality of first connecting blocks are fixedly connected to the outer walls of the lower pressure ring and the bearing ring in the circumferential direction. A rotating plate is rotatably connected to the outer walls of the plurality of first connecting blocks. A second connecting block is fixedly connected to the upper and lower ends of the rotating plate that are close to each other. A push plate is fixedly connected to the outer wall of the second connecting block. The push plate is used to support the workpiece from the inside.

[0008] Furthermore, a pressure plate is fixedly connected to the bottom of the pressure ring, and the bottom of the pressure plate is fixedly connected to the top of the rotary table.

[0009] Furthermore, the adaptive locking mechanism includes a first pressing rod that penetrates the interior of the lower pressure plate, and an inner groove that penetrates the interior of the first pressing rod. A second pressing rod is slidably connected to the inner wall of the inner groove, and a slider is slidably connected to one end of the second pressing rod located on the inner wall of the inner groove. A second spring is fixedly connected to the top of the slider. Two connecting rods are rotatably connected to the end of the slider away from the second spring. A protrusion is rotatably connected to the end of each of the two connecting rods away from the slider. A third spring is fixedly connected between the two protrusions. A mounting block is fixedly connected to the bottom of the rotating platform, and several inclined blocks slide through the interior of the mounting block. A fourth spring is fixedly connected to one end of each inclined block located inside the mounting block, and the end of the fourth spring away from the inclined block is fixedly connected to the interior of the mounting block.

[0010] Furthermore, the inner wall of the pressure ring is fixedly connected to the outer wall of the first pressure rod, so that the pressure ring drives the first pressure rod to move down synchronously. One end of the second pressure rod located inside the inner groove corresponds to the outer wall of the connecting rod. The end of the second spring away from the slider is fixedly connected to the inside of the second pressure rod. The outer wall of the connecting rod is slidably connected to the inner wall of the inner groove. The outer wall of the protrusion away from the third spring corresponds to the end of the inclined block, which is used to form a one-way lock after passing the inclined block.

[0011] Furthermore, the outer wall of the second connecting block is provided with a scraping and anti-slip mechanism, which is used to clean the working area of ​​the push plate and thus increase friction.

[0012] Furthermore, the scraping and anti-slip mechanism includes a guide rod, and two L-shaped plates are slidably connected to the outer wall of the guide rod. An L-shaped block is slidably connected inside each of the two L-shaped plates. A first tension spring is fixedly connected to one end of the L-shaped block inside the L-shaped plate, and a scraper is fixedly connected to the other end of the L-shaped block away from the L-shaped plate. A fixing block is fixedly connected to the side wall of each of the two L-shaped plates, and a second tension spring is fixedly connected between the two fixing blocks.

[0013] Furthermore, the outer wall of the guide rod is fixedly connected to the side wall of the second connecting block via a connecting plate, so that the scraping and anti-slip mechanism moves synchronously with the second connecting block. The end of the first tension spring away from the L-shaped block is fixedly connected to the inside of the L-shaped plate, and the side wall of the scraper corresponds to the outer wall of the push plate.

[0014] Furthermore, a support frame is fixedly connected to the bottom of the worktable, and a servo motor is fixedly installed on the top of the support frame. The output shaft of the servo motor is fixedly connected to the bottom of the rotary table, and the servo motor is used to drive the rotary table to rotate the workpiece.

[0015] A cutting device includes the aforementioned PCBN tool for high-speed cutting of ductile iron.

[0016] Compared with existing technologies, the above solution has the following advantages: 1. By driving the push plate to make a linear expansion motion in the radial direction and supporting it on the inner wall of the brake disc workpiece, since the size and connection angle of all rotating plates are completely consistent, the expansion stroke of each push plate is always synchronized. Therefore, regardless of the inner diameter of the workpiece, it can automatically complete centering and clamping. This achieves adaptive clamping support for brake discs with different inner diameters. Unlike traditional fixtures, there is no need to change the corresponding chucks for each specification. This completely eliminates the disassembly, reassembly and re-alignment operations during production changeovers. At the same time, it eliminates the eccentricity error caused by manual adjustment. It is especially suitable for mass production operations and improves work efficiency.

[0017] 2. The first spring's reset force drives the lower pressure ring and lower pressure plate to move upward, while several push plates simultaneously retract inward to complete the reset. This achieves automatic locking after the workpiece is clamped and pressed down, eliminating the need for additional bolt tightening or replacement of the claw plate. During disassembly, simply pressing the second lower pressure rod at the top will simultaneously unlock and automatically reset the workpiece. This significantly shortens loading and unloading time, achieving a dual improvement in production efficiency and processing accuracy.

[0018] 3. The tension of the first tension spring drives the scraper to slide against the surface of the push plate, thereby generating a scraping motion along the surface of the push plate to remove chips, dust and other impurities attached to the surface of the push plate. Through the automatic scraping of the scraper, it is ensured that the contact surface of the push plate is clean and free of debris each time it is clamped, which can increase the friction of the contact surface, improve the workpiece's ability to resist slippage, avoid the problem of decreased positioning accuracy due to chip contamination when cutting ductile iron at high speed, and improve the quality stability and positioning accuracy consistency of batch processing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure proposed in this invention; Figure 2 This is a schematic diagram of the internal structure of the workbench proposed in this invention; Figure 3 This is a schematic diagram of the internal structure of the rotary table proposed in this invention; Figure 4 This is a schematic diagram of the structural connection between the lower pressure plate and the bearing plate proposed in this invention; Figure 5 This is a schematic diagram of the internal structure of the first downward pressure rod proposed in this invention; Figure 6 This is a schematic diagram of the transmission structure of the slider and the fourth spring proposed in this invention; Figure 7 This is a schematic diagram of the transmission structure of the rotating plate and scraper proposed in this invention.

[0020] The labels in the attached diagram are as follows: 1. Worktable; 2. Rotary table; 3. Expansion internal support mechanism; 4. Adaptive locking mechanism; 5. Scraping and anti-slip mechanism; 6. Support frame; 7. Servo motor; 8. Drive arm; 9. PCBN tool; 301. Lower pressure plate; 302. Lower pressure ring; 303. First spring; 304. Pressure ring; 305. Pressure plate; 306. First connecting block; 307. Rotating plate; 308. Second connecting block; 309. Push Plate; 401, First pressing rod; 402, Inner groove; 403, Second pressing rod; 404, Slider; 405, Second spring; 406, Connecting rod; 407, Protrusion; 408, Third spring; 409, Mounting block; 410, Bevel block; 411, Fourth spring; 501, Guide rod; 502, L-shaped plate; 503, L-shaped block; 504, First tension spring; 505, Scraper; 506, Fixing block; 507, Second tension spring. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] In the description of this invention, it should be understood that the terms "upper," "lower," "top surface," "bottom surface," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the indicated position or element must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are only used to distinguish an entity or operation from another entity or operation, and do not require or imply any actual relationship, order, or relative importance between these entities or operations.

[0023] Example 1, please refer to Figures 1-4 A PCBN tool for high-speed cutting of ductile iron includes a worktable 1, a rotary table 2 rotatably connected to the top of the worktable 1, and an expansion internal support mechanism 3 provided on the top of the rotary table 2. A drive arm 8 is slidably mounted on the top of the worktable 1, and a PCBN tool 9 is fixedly mounted on the output end of the drive arm 8. The PCBN tool 9 is used to cut ductile iron brake disc workpieces. A support frame 6 is fixedly connected to the bottom of the worktable 1, and a servo motor 7 is fixedly mounted on the top of the support frame 6. The output shaft of the servo motor 7 is fixedly connected to the bottom of the rotary table 2, and the servo motor 7 is used to drive the rotary table 2 to rotate the workpiece.

[0024] Furthermore, the expansion internal support mechanism 3 includes a lower pressure plate 301, and a lower pressure ring 302 is fixedly connected to the bottom center of the lower pressure plate 301. A first spring 303 is fixedly connected to the bottom of the lower pressure ring 302, and a bearing ring 304 is fixedly connected to the end of the first spring 303 away from the lower pressure ring 302. Several first connecting blocks 306 are fixedly connected to the outer walls of both the lower pressure ring 302 and the bearing ring 304 in the circumferential direction. Rotating plates 307 are rotatably connected to the outer walls of the several first connecting blocks 306. A second connecting block 308 is fixedly connected to the upper and lower corresponding rotating plates 307 at their close ends. A push plate 309 is fixedly connected to the outer wall of the second connecting block 308. The push plate 309 is used to support the workpiece from the inside. A bearing plate 305 is fixedly connected to the bottom of the bearing ring 304, and the bottom of the bearing plate 305 is fixedly connected to the top of the rotary table 2.

[0025] Specifically, when high-speed machining of ductile iron brake discs is required, the workpiece must first be installed and fixed. When the ductile iron brake disc workpiece to be machined is placed above the lower pressure plate 301, the clamping pressure applied by the operator forces the lower pressure plate 301 to move downwards vertically. Then, the lower pressure plate 301 drives the lower pressure ring 302, which is fixedly connected to its bottom center, to move downwards synchronously. At this time, the lower pressure ring 302 first compresses the first spring 303 and transmits the downward pressure to the bearing ring 304. Simultaneously, several first connecting blocks 306, which are fixedly connected circumferentially to the outer wall of the lower pressure ring 302, move downwards. As the distance between the corresponding upper and lower first connecting blocks 306 becomes closer, the rotating plate 307, which is rotatably connected to the first connecting blocks 306, will rotate at an angle during the process, thus causing the corresponding upper and lower blocks to... The second connecting block 308, which is fixedly connected to one end of the rotating plate 307, moves outward, thereby driving the push plate 309, which is fixedly connected to its outer wall, to expand radially outward in a linear motion. Then, the outer wall of the push plate 309 contacts and supports the inner wall of the brake disc workpiece. Since the size and connection angle of all rotating plates 307 are completely consistent, the expansion stroke of each push plate 309 is always synchronized. Therefore, regardless of the inner diameter of the workpiece, it can automatically complete centering and tightening. This achieves adaptive clamping support for brake discs with different inner diameters. Unlike traditional fixtures, it does not require changing the corresponding chucks for each specification. This completely eliminates the disassembly, reassembly, and re-alignment operations during production changes. At the same time, it eliminates the eccentricity error caused by manual adjustment. It is especially suitable for mass production operations and improves work efficiency.

[0026] Example 2, please refer to Figures 1-6 Based on Embodiment 1, in this embodiment, the rotary table 2 is provided with an adaptive locking mechanism 4 inside, which is used to automatically lock the position of the expansion inner support mechanism 3 after it moves down into place.

[0027] The adaptive locking mechanism 4 includes a first pressing rod 401 that passes through the interior of the lower pressing plate 301, and an inner groove 402 that passes through the interior of the first pressing rod 401. A second pressing rod 403 is slidably connected to the inner wall of the inner groove 402. A slider 404 is slidably connected to one end of the second pressing rod 403 located on the inner wall of the inner groove 402. A second spring 405 is fixedly connected to the top of the slider 404. Two connecting rods 406 are rotatably connected to the end of the slider 404 away from the second spring 405. A protrusion 407 is rotatably connected to the end of each of the two connecting rods 406 away from the slider 404. A third spring 408 is fixedly connected between the two protrusions 407. A mounting block 409 is fixedly connected to the bottom of the rotating platform 2. Several inclined blocks 410 slide through the interior of the mounting block 409. A fourth spring 411 is fixedly connected to one end of the inclined block 410 located inside the mounting block 409. The end of the fourth spring 411 away from the inclined block 410 is fixedly connected to the interior of the mounting block 409.

[0028] Furthermore, the inner wall of the pressure ring 302 is fixedly connected to the outer wall of the first pressure rod 401 so that the pressure ring 302 drives the first pressure rod 401 to move down synchronously. One end of the second pressure rod 403 located inside the inner groove 402 corresponds to the outer wall of the connecting rod 406. One end of the second spring 405 away from the slider 404 is fixedly connected to the inside of the second pressure rod 403. The outer wall of the connecting rod 406 is slidably connected to the inner wall of the inner groove 402. The outer wall of the protrusion 407 away from the third spring 408 corresponds to the end of the inclined block 410, which is used to form a one-way lock after passing the inclined block 410.

[0029] Specifically, as the pressure plate 301 presses down, the inner wall of the pressure ring 302 is fixedly connected to the outer wall of the first pressure rod 401. Therefore, the pressure ring 302 will drive the first pressure rod 401 to move downward synchronously. At the same time, the first pressure rod 401, through the cooperation of the second pressure rod 403 and the second spring 405, drives the slider 404 and the protrusion 407 to move downward synchronously. Then, when the slider 404 moves down to the designated position with the first pressure rod 401, the protrusion 407 is located inside the rotary table 2, and its end will contact and press against the outer wall of the inclined edge block 410. Then, the outer wall of the inclined edge block 410 is subjected to the pressing force of the protrusion 407 pressing downward, forcing the inclined edge block 410 to overcome the downward movement. The elastic force of the fourth spring 411 retracts into the mounting block 409, thereby creating a channel for the protrusion 407 to move inside the rotary table 2. When the protrusion 407 completely passes over the squeezed inclined block 410, the inclined block 410 automatically resets under the elastic force of the fourth spring 411. At this time, the flat surface on the lower side of its end blocks the protrusion 407, thus completing the one-way blocking of the protrusion 407. Then, the operator releases the applied downward pressure to achieve automatic locking after the workpiece is installed. After that, the servo motor 7 is driven to make the rotary table 2 drive the ductile iron brake disc workpiece to rotate at high speed, while the drive arm 8 is controlled to drive the PCBN tool 9 to cut the workpiece.

[0030] When the ductile iron brake disc workpiece needs to be disassembled after machining, the worker presses the top of the second pressing rod 403, causing the second pressing rod 403 to slide downward relative to the first pressing rod 401. At the same time, the slider 404 slides along the inner wall of the second pressing rod 403 and remains in a fixed position, compressing the second spring 405. Then, the end of the downward-moving second pressing rod 403 contacts the outer wall of the connecting rod 406 and presses it, causing the two connecting rods 406 to flip and move closer to each other at the bottom of the slider 404. At the same time, the end of the connecting rod 406 drives the protrusion 407 to slide into the inner groove 402, compressing the third spring 408. After the protrusion 407 slides completely into the interior of the first pressing rod 401, the end of the protrusion 407 will disengage from the end of the inclined block 410, thus releasing the limit. At this time, under the reset force of the first spring 303, the pressing ring 302 and the pressing plate 301 will move upward, and at the same time, several push plates 309 will retract inward to complete the reset. This achieves automatic locking after the workpiece is clamped and pressed down, without the need to tighten bolts or replace the claw plate. When disassembling, only the second pressing rod 403 at the top needs to be pressed to release the lock and automatically reset. The loading and unloading time is greatly shortened, achieving a dual improvement in production efficiency and processing accuracy.

[0031] Example 3, please refer to Figures 1-7 Based on Embodiment 2, in this embodiment, the outer wall of the second connecting block 308 is provided with a scraping and anti-slip mechanism 5, which is used to clean the working area of ​​the push plate 309 and thus increase friction.

[0032] The scraping and anti-slip mechanism 5 includes a guide rod 501, and two L-shaped plates 502 are slidably connected to the outer wall of the guide rod 501. L-shaped blocks 503 are slidably connected inside the two L-shaped plates 502. A first tension spring 504 is fixedly connected to one end of the L-shaped block 503 inside the L-shaped plate 502, and a scraper 505 is fixedly connected to the other end of the L-shaped block 503 away from the L-shaped plate 502. Fixing blocks 506 are fixedly connected to the side walls of the two L-shaped plates 502, and a second tension spring 507 is fixedly connected between the two fixing blocks 506.

[0033] Furthermore, the outer wall of the guide rod 501 is fixedly connected to the side wall of the second connecting block 308 via a connecting plate, so that the scraping and anti-slip mechanism 5 moves synchronously with the second connecting block 308. The end of the first tension spring 504 away from the L-shaped block 503 is fixedly connected to the inside of the L-shaped plate 502, and the side wall of the scraper 505 corresponds to the outer wall of the push plate 309.

[0034] Specifically, because the chips produced by high-speed cutting of ductile iron are small, sharp, and contain hard carbide particles, these chips are easily splashed and adhered to various parts of the device under centrifugal force. When the second connecting block 308 and push plate 309 expand outward during clamping, the rotating plate 307 connected to both ends of the second connecting block 308 will flip and fold, and its outer wall will contact the end slope of the L-shaped plate 502. Then, it will press against it, causing the L-shaped plate 502 to slide along the outer wall of the guide rod 501. At the same time, the second tension spring 507 will be stretched, and the force generated by the stretching will be used to drive the L-shaped plate 502 to return to its original position and slide. Then, the L-shaped plate 502 will drive the L-shaped block 503 and scraper 505 to move outward synchronously. During the process, the cleaning surface of the scraper 505 will undergo relative displacement friction with the surface of the push plate 309. With the first tension spring 504 provided, its tension will drive the scraper 505 to always slide against the surface of the push plate 309 through the L-shaped plate 502, thereby generating a scraping motion along the surface of the push plate 309, scraping off the chips, dust and other impurities attached to the surface of the push plate 309. Through the automatic scraping of the scraper 505, it is ensured that the contact surface of the push plate 309 is clean and free of debris each time it is clamped, which can increase the friction of the contact surface, improve the workpiece's ability to resist slippage, avoid the problem of decreased positioning accuracy due to chip contamination when cutting ductile iron at high speed, and improve the quality stability and positioning accuracy consistency of batch processing.

[0035] A cutting device includes the aforementioned PCBN tool for high-speed cutting of ductile iron.

[0036] It should be noted that all the devices in this application are common devices on the market, and can be selected according to the needs of specific use. The circuit connection relationship of each device is a simple series and parallel connection circuit. There is no innovation in the circuit connection part. Those skilled in the art can easily implement it. It belongs to the prior art and will not be described in detail.

[0037] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A PCBN cutting tool for high-speed cutting of ductile iron, comprising a worktable (1), characterized in that: The top of the worktable (1) is rotatably connected to a rotary table (2), and the top of the rotary table (2) is provided with an expansion inner support mechanism (3). The interior of the rotary table (2) is provided with an adaptive locking mechanism (4). The adaptive locking mechanism (4) is used to automatically lock the position of the expansion inner support mechanism (3) after it moves down to the position. The top of the worktable (1) is slidably mounted with a drive arm (8), and the output end of the drive arm (8) is fixedly mounted with a PCBN tool (9) for cutting ductile iron brake disc workpieces. The expansion internal support mechanism (3) includes a lower pressure plate (301), and a lower pressure ring (302) is fixedly connected at the bottom center of the lower pressure plate (301). A first spring (303) is fixedly connected to the bottom of the lower pressure ring (302), and a bearing ring (304) is fixedly connected to the end of the first spring (303) away from the lower pressure ring (302). A plurality of first connecting blocks (306) are fixedly connected to the outer walls of the lower pressure ring (302) and the bearing ring (304) in the circumferential direction. A rotating plate (307) is rotatably connected to the outer walls of the plurality of first connecting blocks (306). A second connecting block (308) is fixedly connected to the upper and lower ends of the rotating plate (307) that are close to each other. A push plate (309) is fixedly connected to the outer wall of the second connecting block (308). The PCBN cutting tool also includes a scraping and anti-slip mechanism (5).

2. The PCBN cutting tool for high-speed cutting of ductile iron according to claim 1, characterized in that, The bottom of the pressure ring (304) is fixedly connected to a pressure plate (305), and the bottom of the pressure plate (305) is fixedly connected to the top of the rotary table (2).

3. The PCBN cutting tool for high-speed cutting of ductile iron according to claim 2, characterized in that, The adaptive locking mechanism (4) includes a first pressing rod (401) that penetrates the interior of the lower pressing plate (301), and an inner groove (402) is provided inside the first pressing rod (401). A second pressing rod (403) is slidably connected to the inner wall of the inner groove (402), and a slider (404) is slidably connected to one end of the second pressing rod (403) located on the inner wall of the inner groove (402). A second spring (405) is fixedly connected to the top of the slider (404), and two connecting rods (406) are rotatably connected to the end of the slider (404) away from the second spring (405). Each of the connecting rods (406) has a rotatable protrusion (407) at the end away from the slider (404). A third spring (408) is fixedly connected between two of the protrusions (407). A mounting block (409) is fixedly connected to the bottom of the rotary table (2). Several inclined blocks (410) slide through the interior of the mounting block (409). A fourth spring (411) is fixedly connected to one end of the inclined block (410) inside the mounting block (409). The end of the fourth spring (411) away from the inclined block (410) is fixedly connected to the interior of the mounting block (409).

4. A PCBN cutting tool for high-speed cutting of ductile iron according to claim 3, characterized in that, The inner wall of the pressure ring (302) is fixedly connected to the outer wall of the first pressure rod (401) so that the pressure ring (302) drives the first pressure rod (401) to move down synchronously. One end of the second pressure rod (403) located inside the inner groove (402) corresponds to the outer wall of the connecting rod (406). One end of the second spring (405) away from the slider (404) is fixedly connected to the inside of the second pressure rod (403). The outer wall of the connecting rod (406) is slidably connected to the inner wall of the inner groove (402). One end of the protrusion (407) away from the third spring (408) corresponds to the end of the inclined block (410) and is used to form a one-way lock after passing the inclined block (410).

5. A PCBN cutting tool for high-speed cutting of ductile iron according to claim 4, characterized in that, The scraping and anti-slip mechanism (5) is located on the outer wall of the second connecting block (308).

6. A PCBN cutting tool for high-speed cutting of ductile iron according to claim 5, characterized in that, The scraping and anti-slip mechanism (5) includes a guide rod (501), and two L-shaped plates (502) are slidably connected to the outer wall of the guide rod (501). An L-shaped block (503) is slidably connected inside the two L-shaped plates (502). A first tension spring (504) is fixedly connected to one end of the L-shaped block (503) located inside the L-shaped plate (502). A scraper (505) is fixedly connected to one end of the L-shaped block (503) away from the L-shaped plate (502). A fixing block (506) is fixedly connected to the side wall of the two L-shaped plates (502). A second tension spring (507) is fixedly connected between the two fixing blocks (506).

7. A PCBN cutting tool for high-speed cutting of ductile iron according to claim 6, characterized in that, The outer wall of the guide rod (501) is fixedly connected to the side wall of the second connecting block (308) through a connecting plate, so that the scraping anti-slip mechanism (5) moves synchronously with the second connecting block (308). The end of the first tension spring (504) away from the L-shaped block (503) is fixedly connected to the inside of the L-shaped plate (502). The side wall of the scraper (505) corresponds to the outer wall of the push plate (309).

8. A PCBN cutting tool for high-speed cutting of ductile iron according to claim 1, characterized in that, The bottom of the worktable (1) is fixedly connected to a support frame (6), and a servo motor (7) is fixedly installed on the top of the support frame (6). The output shaft of the servo motor (7) is fixedly connected to the bottom of the rotary table (2).

9. A cutting device, characterized in that, The invention includes a PCBN tool for high-speed cutting of ductile iron as described in any one of claims 1-8.

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