A thread turning chip removal mechanism and method

Abstract

The application discloses a female thread turning chip removal mechanism and a chip removal method, belongs to the field of machining manufacturing, and relates to female thread turning machining of carbon structural steel and alloy structural steel. The chip removal mechanism comprises a chip guide device and a cleaning device, a chip guide body is arranged on a tool shank of a turning tool, a chip cavity for guiding and extruding iron chips is formed in the chip guide body, and the opening of the chip cavity is aligned with the front surface of a blade. In the process of turning the female thread of a part, the generated iron chips enter the chip cavity of the chip guide body, the chip cavity guides and extrudes the iron chips, and at the same time, the cleaning device matched with the chip guide device sprays gas or liquid to the moving track of the iron chips, and the extruded iron chips are blown out of the inner contour of the part. The chip removal mechanism has the advantages of simple principle and structure, guaranteed machining quality of the part, increased service life of the tool, improved machining efficiency, and good popularization and application value.

Description

Technical Field

[0001] This invention belongs to the field of mechanical processing and manufacturing, and specifically relates to a chip removal mechanism and method for internal thread turning. Background Technology

[0002] When turning internal threads on a CNC lathe, if the chips cannot be broken or removed in a timely and effective manner during the machining process, the chips will scratch the machined surface of the inner contour. This not only affects the machining quality, but also has a serious impact on tool life and machining efficiency.

[0003] In the field of thread turning, the tooth profiles of triangular and trapezoidal threads result in excessively small cutting tool tips, making it impossible to design chip-breaking grooves on the rake face of the cutting edge. This leads to the generation of ribbon-like or strip-like chips during thread turning, and the direction of chip discharge is uncontrollable. Particularly during internal thread turning, the threading tool remains within the workpiece's internal contour throughout the process, exacerbating the phenomenon of chips entanglement on the tool and workpiece. This directly causes severe wear on the cutting edge and rake face, scratches on the machined surface of the workpiece's inner contour, and reduced surface quality. Currently, to address these issues, the industry commonly employs frequent manual intervention to remove chips during each turning process to reduce the impact of chip entanglement and scratching. However, this practice significantly reduces machining efficiency and, due to improper operation, can also pose safety hazards.

[0004] Generally speaking, existing methods for cleaning iron filings have the following problems:

[0005] (1) For CNC lathe cutting tools for internal threads, the cutting tip shape of the inserts for triangular threads, trapezoidal threads, etc. is too small, and the rake face at the cutting edge of the thread insert cannot be designed with a chip breaker groove, so the control and chip breaking functions cannot be realized. (2) In the internal thread turning process, the accumulation and entanglement of iron chips in the internal contour of the part is aggravated. The existing process method of using intermittent internal thread turning path can shorten the length of the strip-shaped iron chips, but the shortened iron chips still accumulate in the internal contour, and the problem of iron chips being discharged from the internal contour cannot be solved. (3) Using the process method, the insert cuts intermittently, which has a large impact on the cutting edge of the insert and seriously affects the durability of the tool insert; and the internal thread turning process requires manual intervention. Each turning cycle requires the use of an iron hook to hook out the iron chips, which is time-consuming and laborious.

[0006] It is evident that existing chip removal methods are insufficient to effectively remove iron filings from the machining area of ​​the inner contour of a part. Summary of the Invention

[0007] To overcome the above-mentioned technical defects, the present invention provides a chip removal mechanism and chip removal method for internal thread turning, which can solve the technical problem that existing chip cleaning methods have difficulty in effectively removing chips from the inner contour machining area of ​​the part.

[0008] To achieve the above objectives, the present invention employs the following technical content:

[0009] A chip removal mechanism for internal thread turning includes a chip guiding device, wherein the chip guiding device includes a chip guiding body disposed on the tool holder of the turning tool;

[0010] The chip guide body has a chip cavity, and the opening of the chip cavity faces the front of the blade.

[0011] It also includes a cleaning device that works in conjunction with the chip guiding device, the cleaning device being able to spray gas or liquid onto the movement path of the iron chips.

[0012] Furthermore, the debris cavity adopts an arc-shaped structure, and a chip guide groove is provided on the inner wall. The chip guide groove is in the shape of a circular arc spiral.

[0013] Multiple chip-blocking blocks are provided on the edge of the chip guide groove, and the multiple chip-blocking blocks are arranged in accordance with the spiral direction of the chip guide groove.

[0014] The bottom surface of the chip guide body is connected to the tool holder, and the top surface abuts against the side of the chip cavity, with a chip extrusion step provided at the abutment.

[0015] Furthermore, the cleaning device includes a cleaning body;

[0016] The cleaning body is connected to the top of the cutter bar, and the cleaning body, the chip guide body, and the cutter bar together form a semi-enclosed space;

[0017] The cleaning body has an air vent, which is positioned to face the trajectory of the iron filings.

[0018] Furthermore, the air outlet includes a first outlet, a second outlet, and a third outlet; the first outlet is directed towards the front of the blade; the second outlet is directed towards the axial direction of the blade holder; and the third outlet is directed towards the debris cavity.

[0019] Furthermore, the cleaning body has an air inlet that communicates with the air outlet, and a hollow positioning pin is inserted into the air inlet. The cleaning body is connected to the blade rod through the positioning pin. The blade rod has an inner through hole that is axially extended, and the positioning pin communicates with the inner through hole.

[0020] Furthermore, a sealing ring is provided between the air inlet and the positioning pin.

[0021] Furthermore, the sidewall of the cleaning body near the blade is configured as an arc surface.

[0022] Furthermore, it also includes a chip-breaking device for impacting iron chips discharged from the inner contour of the part.

[0023] A chip removal method based on the above-mentioned internal thread turning chip removal mechanism includes:

[0024] During the turning process, the generated iron chips enter the chip cavity of the chip guide body. The chip cavity guides and crushes the iron chips. At the same time, the cleaning device sprays gas or liquid onto the movement trajectory of the iron chips, blowing the crushed iron chips out of the inner contour of the part.

[0025] Furthermore, the chip removal method includes:

[0026] During the turning process, with the cooperation of the chip guiding device and the cleaning device, the iron chips enter the chip guide groove of the chip cavity. Under the impact of the chip blocking block, they accumulate and crush at the chip crushing step, resulting in plastic deformation. At the same time, the first outlet, the second outlet and the third outlet on the cleaning body spray gas or liquid onto the front of the cutting tool, the axial direction of the cutting tool holder and the chip cavity, respectively, blowing the crushed iron chips out of the inner contour of the part.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] This invention provides a chip removal mechanism for internal thread turning. The mechanism includes a chip guiding device and a cleaning device. A chip guiding body is mounted on the tool holder of the turning tool. The chip guiding body has a chip cavity for guiding and crushing iron chips, with the opening of the chip cavity aligned with the front of the cutting tool. During internal thread turning of the part, the generated iron chips enter the chip cavity of the chip guiding body. The chip cavity guides and crushes the iron chips. Simultaneously, the cleaning device, in conjunction with the chip guiding device, sprays gas or liquid along the movement trajectory of the iron chips, blowing the crushed iron chips out of the inner contour of the part. This chip removal mechanism has a simple principle and structure, ensures the machining quality of the part, increases the tool life, and improves machining efficiency, making it highly valuable for widespread application.

[0029] Preferably, in this invention, the chip cavity is arc-shaped, with chip guide grooves and multiple chip baffles arranged in a spiral pattern on the inner wall. Furthermore, a chip extrusion step is provided at the junction of the top surface of the chip guide body and the side of the chip cavity. In this way, as the iron filings enter the chip cavity, that is, into the chip guide grooves, they collide with the chip baffles and eventually accumulate and crush at the chip extrusion step, resulting in plastic deformation. With the cooperation of the chip guide grooves, chip baffles, and chip extrusion steps, the effective guidance and crushing effect of the iron filings is achieved.

[0030] Preferably, in this invention, the cleaning device includes a cleaning body disposed at the top of the tool holder, and the cleaning body, chip guide body, and tool holder together form a semi-enclosed space. Under this design, the cleaning device has two functions: First, its main function is to work in conjunction with the chip guide device to eject crushed iron chips at high speed from the inner contour machining area of ​​the part by spraying gas or liquid along the chip movement trajectory. Second, when the cleaning body, chip guide body, and tool holder together form a semi-enclosed space, the cleaning device also acts as a guide, effectively blocking forward-splashing iron chips. In actual production, iron chips mainly splash in three directions: left, front, and right of the cutting tool. The left side is the direction of contact between the cutting tool and the part during turning. Therefore, the splashed iron chips are blocked by the inner wall of the part and eventually collect in the chip guide device. Similarly, the iron chips in front are blocked by the cleaning device and also eventually collect in the chip guide device, greatly improving the efficiency of iron chip removal.

[0031] More preferably, the air outlet of the chip guide body includes a first outlet, a second outlet, and a third outlet, which correspond to the front of the cutting tool, the tool holder, and the chip cavity, respectively. In this way, the entire movement trajectory of the chips is covered, allowing the chips to be discharged at high speed from the inner contour machining area of ​​the part.

[0032] More preferably, considering the space occupied by the lathe, an internal channel is adopted. The tool holder of the turning tool is improved by setting an internal through hole for connecting the air source (water source). The cleaning body is connected to the tool holder through a hollow positioning pin. In this way, when gas or liquid needs to be sprayed, the air (liquid) pump is turned on, and the gas or liquid enters through the internal through hole, passes through the tool holder, positioning pin and air inlet to the cleaning body, and is sprayed outward from the air outlet of the cleaning body. This design saves space and facilitates standardized and unified configuration. At the connection end between the tool holder and the turret, air or water sources with different pressure values ​​can be connected according to the material specifications of the workpiece to be processed. The configuration and installation can be completed before turning, improving the work efficiency of the turning process.

[0033] Preferably, in this invention, the side wall of the cleaning body near the blade is set as an arc surface. Since the cleaning body will move axially with the blade, it is likely to come into contact with the inner wall of the part. The arc surface design can reduce the wear between the cleaning body and the inner wall of the part.

[0034] Preferably, the present invention also includes a chip-breaking device for impacting the iron chips discharged from the inner contour of the part. When the iron chips are discharged from the inner contour of the part, they will form a long strip structure that is not easy to break. The chip-breaking device impacts them to achieve the purpose of breaking the iron chips. Together with the chip guiding device and the cleaning device, the effect of controlling, discharging and breaking the iron chips in the turning process is realized.

[0035] This invention also provides a chip removal method for internal thread turning. Based on the aforementioned chip removal mechanism for internal thread turning, this chip removal method can solve the problem of chip accumulation during internal thread turning and effectively remove chips from the machining area of ​​the inner contour of the part. This method is simple in principle, easy to operate and implement, ensures the machining quality of the internal thread of the part, saves manpower and time, and improves production efficiency. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of an internal thread turning chip removal mechanism provided in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the structure of a CNC lathe turning system provided in an embodiment of the present invention;

[0038] Figure 3 An exploded view of the structure of a chip removal mechanism for internal thread turning provided in an embodiment of the present invention, wherein, Figure 3 (a) is a three-dimensional schematic diagram. Figure 3 (b) is a three-dimensional schematic diagram from another angle;

[0039] Figure 4 A schematic diagram of the chip guiding device of an internal thread turning chip removal mechanism provided in an embodiment of the present invention;

[0040] Figure 5 A schematic diagram of the cleaning device for a chip removal mechanism in internal thread turning provided in an embodiment of the present invention;

[0041] Figure 6 A schematic diagram of the air (water) blowing direction of a cleaning device for an internal thread turning chip removal mechanism provided in an embodiment of the present invention;

[0042] Figure label:

[0043] 1. CNC lathe; 2. Part; 3. CNC system; 4. Internal thread turning chip removal mechanism; 5. Turret; 6. First fixing screw; 7. Cleaning body; 8. Second fixing screw; 9. Chip guide body; 10. Tool holder; 11. Insert; 12. Positioning pin; 13. Sealing ring; 14. Internal through hole; 15. Chip block; 16. Chip guide groove; 17. Chip extrusion step; 18. Air inlet; 19. Air outlet;

[0044] 31. Turning tools; 41. Chip guide device; 42. Cleaning device. Detailed Implementation

[0045] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0048] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0049] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present 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, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0050] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0051] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0052] The present invention will now be described in further detail with reference to the accompanying drawings:

[0053] Example

[0054] As mentioned in the background technology, most existing cleaning methods for internal thread turning have the following problems: (1) For CNC lathe internal thread turning tools, the cutting edge shape of the inserts for triangular threads, trapezoidal threads, etc. is too small, and the rake face at the cutting edge of the thread insert cannot be designed with a chip breaking groove, so the function of controlling and breaking chips cannot be realized. (2) During the internal thread turning process, the accumulation and entanglement of iron chips in the internal contour of the part is aggravated. Although the existing process method of using intermittent internal thread turning paths shortens the length of the strip-shaped iron chips, the shortened iron chips still accumulate in the internal contour, and the problem of iron chips being discharged from the internal contour cannot be solved. (3) When using the process method, the insert cuts intermittently, which has a large impact on the cutting edge of the insert and seriously affects the durability of the tool insert; and the internal thread turning process requires manual intervention, and iron chips need to be hooked out with an iron hook in each turning cycle, which is time-consuming and laborious. Therefore, there is an urgent need for a device that can control, break, and discharge iron chips during internal thread machining to solve the current machining situation.

[0055] To achieve the above objectives, this embodiment provides a chip removal mechanism and method for internal thread turning, which can effectively solve the problem that chips are not easily removed from the machining area of ​​the inner contour of the part. This chip removal mechanism and method can be applied to CNC lathes and is also applicable to chip removal in the machining of triangular threads, trapezoidal threads, and other threads of various carbon structural steels and alloy structural steels.

[0056] The specific structure of this embodiment will be described in detail below with reference to the accompanying drawings:

[0057] like Figure 1 As shown, this embodiment provides a chip removal mechanism for internal thread turning, including a chip guiding device 41 and a cleaning device 42 connected to the turning tool 31; the components are connected and fixed with screws.

[0058] Of course, the cleaning device 42 here can be as follows Figure 1 The device shown is either connected to the tool holder 10 or not connected, and it meets the requirements as long as it can spray gas or liquid onto the movement trajectory of the iron chip.

[0059] The turning tool 31 includes a tool holder 10 and an insert 11. The insert 11 is fixed to the front end of the tool holder 10 at a horizontal position with screws.

[0060] like Figure 4 As shown, the chip guiding device 41 is designed with an irregular structure. The chip guiding body 9 is recessed inward to form a chip cavity, specifically including: a circular arc spiral chip guiding groove 16, a spirally distributed rectangular chip blocking block 15 (which can also be set to other shapes), and a chip extrusion step 17. It is an integral machining structure with a wear-resistant coating. The chip guiding device 41 is installed using the second fixing screw 8 as shown. Figure 1 The position in the middle.

[0061] like Figure 2 As shown, Figure 2 This is a structural diagram of the entire CNC lathe turning system, including the CNC lathe 1, the CNC system 3, and the tool turret 5. During machining, the part 2 is fixed on the CNC lathe 1, and the internal thread turning chip removal mechanism is fixed on the tool turret 5.

[0062] The working principle (chip removal method) of the internal thread turning chip removal mechanism in this implementation is as follows:

[0063] The internal thread turning chip removal mechanism 4 is installed on the tool turret 5 of the CNC lathe 1. During internal thread machining, the CNC machining program controls the turning tool 31 to drive the internal thread turning chip removal mechanism 4 in turning motion. Each time an internal thread is turned, the generated chips enter the chip guide device 41. The chips collide with the chip stop block 15 along the arc-shaped spiral groove of the chip guide groove 16, accumulating and crushing at the chip extrusion step 17, resulting in plastic deformation. Simultaneously, the cleaning device 42, which works in conjunction with the chip guide device 41, sprays gas or liquid along the chip movement trajectory, discharging the plastically deformed chips at high speed from the inner contour machining area, completing the chip removal for one turn (tool). Throughout the entire internal thread turning process, this process is repeated for each turn (tool) until the internal thread turning is complete.

[0064] In another embodiment of the present invention, such as Figure 3 (a) and Figure 3 As shown in (b), in combination Figure 5 The cleaning device 42 specifically includes: a first fixing screw 6, a hollow positioning pin 12, a sealing ring 13, an air inlet 18 (which can also be a water inlet), and three air outlets 19 (which can also be water outlets) in different directions. The positioning pin 12 is threadedly connected to the front end of the tool holder 10. The sealing ring 13 is fitted onto the step of the positioning pin 12 and inserted into the air inlet 18. The cleaning body 7 is mounted on the tool holder 10 using the first fixing screw 6. Figure 1 The front end of the tool holder 10.

[0065] Due to space constraints on the lathe, an internal channel was incorporated. Specifically, the tool holder 10 of the turning tool 31 was modified by adding an internal through-hole 14 for connecting an air (water) source. The cleaning body 7 is connected to the tool holder 10 via a hollow positioning pin 12. When gas or liquid needs to be injected, the air (liquid) pump is turned on, and the gas or liquid enters through the internal through-hole 14, passes through the tool holder 10, positioning pin 12, and air inlet 18, and is then ejected outwards through the air outlet 19. This design saves space and facilitates standardized and unified configuration. At the connection point between the tool holder 10 and the turret 5, air or water sources with different pressure values ​​can be connected according to the material specifications of the workpiece. Configuration and installation are completed before turning, improving the efficiency of the turning process.

[0066] In this embodiment, the turret 5 features a compressed air (1 MPa) pneumatic circuit design. This circuit connects to the internal through-hole 14 of each tool position. A solenoid valve controls the opening and closing of the pneumatic circuit, and machine tool M-code has been developed for invocation within the machining program. The cylindrical tool holder 10, with a standard diameter, can be directly mounted on the CNC lathe turret 5 using a standard tool sleeve. It can interface with the redesigned pneumatic circuit of the turret 5, allowing for on / off pneumatic circuit configuration under the control of the CNC system's M-code.

[0067] like Figure 6 As shown, in another embodiment of the present invention, the air outlet 19 is configured as a first outlet, a second outlet, and a third outlet. The first outlet sprays air towards the front of the blade 11; the second outlet sprays air towards the axial direction of the tool holder 10; and the third outlet sprays air towards the chip cavity. During internal thread machining, the CNC machining program controls the turning tool 31 to drive the internal thread turning chip removal mechanism 4 to perform turning motion. Each time an internal thread is turned, the generated chips enter the chip guide device 41. Iron chips impact the chip-blocking block 15 along the arc-shaped spiral groove of the chip guide groove 16, accumulating and crushing at the chip extrusion step 17 to produce plastic deformation. Simultaneously, the M code in the machining program opens the solenoid valve, and 1 MPa compressed air flows out at high speed from the air (water) outlet 19 in three directions: obliquely downward towards the internal thread cutting tool 11, straight backward towards the chip guide groove 16, and obliquely upward towards the chip extrusion step 17. This high-speed discharge of the plastically deformed iron chips from the inner contour machining area completes the removal of iron chips from one internal thread turning operation. Throughout the entire internal thread turning process, this process is repeated after each turning operation until the internal thread turning is completed.

[0068] In another embodiment of the present invention, the mechanism is further provided with a chip-breaking device for impacting the iron chips discharged from the inner contour of the part. For the strip-shaped iron chips generated by threading, the iron chips are broken by using a 5-7 MPa high-pressure coolant. First, an external high-pressure pump is used to pressurize the coolant to 5-7 MPa, and it is directly connected to the CNC tool turret's tool position 5 through the machine tool's high-pressure water circuit. The 5-7 MPa high-pressure coolant directly impacts the threading tool insert from the tool position outlet.

[0069] During the turning process, the high-speed iron chips are impacted by the high-pressure coolant, causing them to deform or curl up, thus achieving the purpose of breaking the iron chips.

[0070] In summary, this invention provides a chip removal mechanism and method for internal thread turning, which has the following advantages compared to existing chip cleaning methods:

[0071] By employing this mechanism and chip removal method, the problem of iron chips frequently entangled in the tool and workpiece during internal thread turning, affecting the inner contour and surface quality of the part, is solved. In actual production and processing, it increases tool life and improves processing efficiency; it also enables unmanned operation of the internal thread turning process, marking a significant step forward in the automation of internal thread turning in the machinery manufacturing industry.

[0072] First, it achieves the control, breaking, and removal of iron chips during internal thread turning.

[0073] Secondly, the chip guide device in this mechanism can control the discharge direction of iron chips during internal thread turning, so as to achieve plastic deformation by bending and crushing the iron chips.

[0074] Third, the cleaning device in this internal thread turning chip removal device can, under the control of the CNC machining program, have 1 MPa of compressed air flow out at high speed from the air outlet along three directions: downward obliquely towards the internal thread cutting tool 11, forward backward blowing towards the chip guide groove 16, and upward obliquely extruding chip step 17, so as to discharge the plastically deformed iron chips backward towards the inner contour machining area.

[0075] Fourth, this internal thread turning chip removal mechanism and method utilizes the CNC system and CNC turret of the CNC lathe. Under the control of the machining program, the chips are discharged from the machining area in a certain direction. The process is unattended, safe and efficient.

[0076] Fifth, the success rate of controlling, breaking, and removing iron filings generated during internal thread turning is 100%.

[0077] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A chip removal mechanism for internal thread turning, characterized in that, Includes a chip guiding device (41), which includes a chip guiding body (9) disposed on the tool holder (10) of the turning tool (31). The chip guide body (9) has a chip cavity, and the opening of the chip cavity is set facing the front of the blade (11); It also includes a cleaning device (42) that works in conjunction with the chip guiding device (41), the cleaning device (42) being able to spray gas or liquid onto the movement path of the iron chips; The debris cavity adopts an arc-shaped structure, and a chip guide groove (16) is provided on the inner wall. The chip guide groove (16) is in the shape of a circular arc spiral. Multiple chip-blocking blocks (15) are provided on the edge of the chip guide groove (16), and the multiple chip-blocking blocks (15) are arranged in accordance with the spiral direction of the chip guide groove (16). The bottom surface of the chip guide body (9) is connected to the tool holder (10), and the top surface abuts against the side of the chip cavity. A chip extrusion step (17) is provided at the abutment. The cleaning device (42) includes a cleaning body (7); The cleaning body (7) is connected to the top of the tool bar (10), and the cleaning body (7), the chip guide body (9), and the tool bar (10) together form a semi-enclosed space. The cleaning body (7) is provided with an air outlet (19), which is set toward the trajectory of the iron filings. The air outlet (19) includes a first outlet, a second outlet, and a third outlet; the first outlet is directed toward the front of the blade (11); the second outlet is directed toward the axial direction of the blade shank (10); and the third outlet is directed toward the debris cavity. The cleaning body (7) has an air inlet (18) that communicates with the air outlet (19). A hollow positioning pin (12) is inserted into the air inlet (18). The cleaning body (7) is connected to the knife bar (10) through the positioning pin (12). The knife bar (10) has an inner through hole (14) axially. The positioning pin (12) communicates with the inner through hole (14).

2. The chip removal mechanism for internal thread turning according to claim 1, characterized in that, A sealing ring (13) is provided between the air inlet (18) and the positioning pin (12).

3. The chip removal mechanism for internal thread turning according to claim 1, characterized in that, The sidewall of the cleaning body (7) near the blade (11) is set as an arc surface.

4. The chip removal mechanism for internal thread turning according to claim 1, characterized in that, It also includes a chip-breaking device for impacting iron chips ejected from the inner contour of the part.

5. A chip removal method based on the chip removal mechanism for internal thread turning according to any one of claims 1-4, characterized in that, include: During the turning process, the generated iron chips enter the chip cavity of the chip guide body (9), the chip cavity guides and crushes the iron chips, and at the same time, the cleaning device (42) sprays gas or liquid onto the movement trajectory of the iron chips, blowing the crushed iron chips out of the inner contour of the part.

6. The chip removal method according to claim 5, characterized in that, include: During the turning process, the iron chips enter the chip guide groove (16) of the chip cavity with the cooperation of the chip guide device (41) and the cleaning device (42). Under the impact of the chip block (15), the chips accumulate and are crushed at the chip crushing step (17) to produce plastic deformation. At the same time, the first outlet, the second outlet and the third outlet on the cleaning body (7) spray gas or liquid onto the front of the cutting tool (11), the axial direction of the tool holder (10) and the chip cavity respectively, blowing the crushed iron chips out of the inner contour of the part.

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