PCD precision boring cutter

Abstract

The invention discloses a PCD precise boring cutter, which relates to the technical field of cutters, and comprises a fixed seat, a protective shell, an air guide pipe, a push rod, a cutter head body, an injection unit and a liquid inlet pipe, the injection unit comprises a liquid storage bag body and a liquid discharge pipe; the interior of the liquid storage bag body is divided into two parts, namely a main cavity and a compensation cavity; a plurality of liquid discharge pipes are uniformly arranged in the circumferential direction of the main cavity and are communicated with the interior of the main cavity through a hose and an outlet pipe in sequence; the liquid discharging pipe is rotationally connected to the bottom of the protective shell through a ball hinge seat, a one-way liquid discharging valve is arranged in the liquid discharging pipe, a nozzle of the liquid discharging pipe is allowed to rotate by a corresponding angle along with vibration of the cutter, self-adaption of the spraying direction is ensured, and cutting liquid is preferentially sprayed to the direction opposite to vibration displacement; centrifugal force moment caused by mass eccentricity is partially counteracted, so that vibration is inhibited; the technical effects that cutting fluid flows in a self-adaptive guiding mode, automatic compensation is achieved, vibration is reduced, the machining precision is improved, and the service life of a cutter is prolonged can be achieved.

Description

A PCD precision boring tool Technical Field

[0001] This invention relates to the field of cutting tool technology, and in particular to a PCD precision boring tool. Background Technology

[0002] PCD (Polycrystalline Diamond) precision boring tools are superhard tools made of polycrystalline diamond composite materials. Their core is formed by sintering diamond micropowder under high temperature and pressure, combined with tungsten steel tool body to achieve a balance of high strength and wear resistance. They are designed for high-precision machining and are especially suitable for the internal hole finishing of non-ferrous metals such as aluminum and copper, as well as non-metallic materials.

[0003] Regarding the design of boring tools, Chinese invention patent CN114669769B discloses a PCD precision boring tool, comprising: a fixed base, a protective shell fixed to the lower side of the fixed base, a push rod fixed to the lower side of the fixed base and located inside the protective shell, a movable plate fixed to the telescopic end of the push rod, a cutting element disposed on the lower side of the movable plate, a U-shaped structure on the lower side of the protective shell, a pressing plate slidably disposed within the U-shaped structure, an elastic element connected to the side of the movable plate disposed on the upper side of the pressing plate, and a bladder installed on the lower side of the pressing plate. This invention is based on the boring tool's downward and upward strokes, and incorporates corresponding components for extracting and spraying cutting fluid. The cutting fluid is only sprayed during tool use, effectively saving cutting fluid and avoiding many problems caused by electrical control structures. Additionally, an air jet assembly for cleaning debris is included, facilitating the cleaning of the tool and workpiece.

[0004] While using this boring bar can improve work efficiency to some extent, in practical applications, due to the high-speed rotation of the boring bar and the fact that the tool is fixed by positioning bolts and limit plates (with a small number of bolts linearly distributed), uneven tool protrusion length adjustment or inconsistent locking force can easily lead to tool mass eccentricity, resulting in unbalanced mass. This unbalanced mass generates centrifugal force, which in turn produces chatter. Mass eccentricity exacerbates chatter energy, causing the tool trajectory to deviate from the preset path, resulting in uneven boring diameter. If vibration is not suppressed in time, it will affect machining accuracy, surface quality, and tool life. Summary of the Invention

[0005] This application provides a PCD precision boring tool, which solves the technical problems in the prior art where the boring tool experiences chatter due to centrifugal force caused by mass eccentricity during high-speed rotation, which affects machining accuracy, reduces surface quality, and shortens tool life. It achieves the technical effects of adaptive guiding flow of cutting fluid, automatic compensation, reduced vibration, improved machining accuracy, and extended tool life.

[0006] This application provides a PCD precision boring tool, including a fixed base, a protective shell, an air guide pipe, a push rod, a moving plate, a drive motor, an extrusion plate, a fixture, a tool head body, an injection unit, and a liquid inlet pipe. The injection unit includes a liquid storage bladder and a liquid outlet pipe. The liquid storage bladder is fixed below the extrusion plate and coaxially arranged with the tool head body. The liquid storage bladder is divided into two parts: a main cavity and a compensation cavity. Multiple liquid outlet pipes are provided, evenly arranged along the circumference of the main cavity and connected to the inside of the main cavity in sequence through a hose and an outlet pipe. The liquid outlet pipe is rotatably connected to the bottom of the protective shell through a ball joint, and a one-way liquid outlet valve is provided inside, allowing the liquid outlet nozzle to rotate at a corresponding angle with the tool vibration, ensuring that the injection direction is adaptive, so that the cutting fluid is preferentially sprayed in the opposite direction of the vibration displacement. The momentum reaction force generated by the liquid injection partially offsets the centrifugal torque caused by mass eccentricity, thereby suppressing vibration.

[0007] Furthermore, the protective shell is fixed to the bottom of the fixed base; from top to bottom, the bottom of the fixed base is fixed with a push rod, a moving plate, a drive motor, an extrusion plate, a clamp and a cutter head body, and the bottom of the cutter head body is connected to a boring tool body by bolts; the liquid inlet pipe is fixed to the outside of the protective shell, and a one-way liquid inlet valve is provided in the middle.

[0008] Furthermore, the main cavity and the compensation cavity are coaxially arranged and are connected to the inlet pipe through branch pipes. By moving the extrusion plate upward, negative pressure is generated inside the main cavity and the compensation cavity, and cutting fluid is drawn from the inlet pipe through the corresponding branch pipes.

[0009] Furthermore, the main cavity has a storage volume that accounts for 60% of the storage volume of the liquid reservoir, and its material has a hardness of Shore A70; the compensation cavity has a storage volume that accounts for 40% of the storage volume of the liquid reservoir, and its material has a hardness of Shore A50.

[0010] Furthermore, the inner wall of the compensation chamber is uniformly provided with multiple nozzles along its circumference; the outer wall of the cutter head is provided with a guide groove along its circumference, and the guide groove has a spiral structure; the outlet position of the nozzle is aligned with the guide groove of the cutter head, and the liquid is automatically thrown to the side of mass loss by using the centrifugal force of rotation.

[0011] Furthermore, the main cavity is evenly divided into multiple cavities along its circumference, and each cavity is connected to a corresponding drain pipe through an outlet pipe and a flexible tube.

[0012] Furthermore, a metal sheet is provided at the connection between the outlet pipe and the corresponding cavity. The metal sheet is a vibration-sensitive metal sheet with its plane direction parallel to the fluid flow direction. When the tool vibrates, the fluid impacts the metal sheet, causing oscillation, which changes the fluid resistance inside the pipe and generates a pressure difference. This restricts the discharge of fluid from the drain pipe in that area, thereby guiding the cutting fluid in the area with large vibration amplitude to flow out preferentially.

[0013] Furthermore, the drain pipe has a tree-like structure, consisting of a main pipe and several branch pipes; the main pipe is connected to a main nozzle at its end for conventional cooling; and the branch pipes are connected to auxiliary nozzles at their ends for pulse jetting.

[0014] Furthermore, the diameter of the main nozzle is three times that of the secondary nozzle.

[0015] Furthermore, the secondary nozzle is connected to the branch pipe via a ball joint, and the movable axis of the nozzle is always inclined at an angle of 15 to 30 degrees with the rotation axis of the cutter head body; the tangential jet of the secondary nozzle generates a reaction force to compensate for the vibration of the boring tool body caused by mass eccentricity.

[0016] One or more technical solutions provided in this application have at least the following technical effects or advantages: By partitioning the reservoir (i.e., the main cavity and the compensation cavity) and optimizing the material gradient, the cutting fluid pulse and base flow can be output in a coordinated manner under the action of the extrusion plate; the ball joint of the drain pipe can enable the nozzle to automatically turn with vibration and generate a reaction force in conjunction with the tangential spray of the tree-shaped branch pipe; the vibration sensing mechanism of the metal sheet guides the liquid flow to preferentially compensate the vibration source area; and the spiral structure of the guide groove is used to automatically distribute the liquid mass with the help of centrifugal force, so as to achieve dynamic balance with the cutting fluid as the medium; effectively solving the technical problems in the prior art of chatter caused by centrifugal force due to mass eccentricity when the boring tool rotates at high speed, which affects the machining accuracy, reduces the surface quality and tool life, and realizes the technical effects of cutting fluid adaptive guiding flow, automatic compensation, vibration reduction, improved machining accuracy and extended tool life. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the overall structure of a PCD precision boring tool according to the present invention.

[0018] Figure 2 is a three-dimensional cross-sectional view of a PCD precision boring tool according to the present invention.

[0019] Figure 3 is a longitudinal full-section schematic diagram of a PCD precision boring tool according to the present invention.

[0020] Figure 4 is a three-dimensional structural diagram of the jetting unit, fixture, and tool disc of a PCD precision boring tool according to the present invention.

[0021] Figure 5 is a front view of the jetting unit of a PCD precision boring tool according to the present invention.

[0022] Figure 6 is a full sectional view along line AA of a PCD precision boring tool according to the present invention.

[0023] Figure 7 is a partial three-dimensional cross-sectional view of a single drain pipe and a portion of the protective shell of a PCD precision boring tool according to the present invention.

[0024] Figure 8 is a longitudinal full sectional view of a single drain tube of a PCD precision boring tool according to the present invention.

[0025] In the diagram: 100, fixed base; 110, protective shell; 111, air guide pipe; 120, push rod; 130, moving plate; 140, drive motor; 150, extrusion plate; 160, fixture; 170, cutter head body; 171, boring tool body; 172, guide groove; 200, injection unit; 201, liquid inlet pipe; 202, branch pipe body; 210, liquid storage bladder body; 220, main cavity body; 221, outlet pipe; 222, hose; 230, compensation cavity body; 231, nozzle pipe; 240, drain pipe; 241, ball joint seat; 242, main pipe; 243, branch pipe; 244, main nozzle; 245, auxiliary nozzle; 250, metal sheet. Detailed Implementation

[0026] To facilitate understanding of the present invention, a more complete description of this application will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of the present invention.

[0027] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] Example 1: As shown in Figures 1 to 4, this application discloses a PCD precision boring tool, including a fixed base 100, a protective shell 110, an air guide pipe 111, a push rod 120, a moving plate 130, a drive motor 140, a pressing plate 150, a clamp 160, a tool head body 170, an injection unit 200, and a liquid inlet pipe 201; the injection unit 200 includes a liquid storage bladder 210 and a liquid outlet pipe 240; the liquid storage bladder 210 is fixed below the pressing plate 150 and coaxially arranged with the tool head body 170; the liquid storage bladder 210 is internally divided into two parts, namely a main cavity 220 and a compensation cavity. 230; Multiple drain pipes 240 are provided, evenly arranged around the circumference of the main cavity 220 and connected to the inside of the main cavity 220 in sequence through hoses 222 and outlet pipes 221; The drain pipes 240 are rotatably connected to the bottom of the protective shell 110 through ball joints 241, and are provided with a one-way drain valve inside, allowing the nozzle of the drain pipe 240 to rotate at a corresponding angle with the vibration of the tool, ensuring that the spray direction is adaptive, so that the cutting fluid is preferentially sprayed in the opposite direction of the vibration displacement, and the momentum reaction force generated by the liquid spray partially offsets the centrifugal torque caused by mass eccentricity, thereby suppressing vibration.

[0030] The protective shell 110 is fixed to the bottom of the fixed base 100; from top to bottom, the fixed base 100 is fixed with a push rod 120, a moving plate 130, a drive motor 140, a pressing plate 150, a clamp 160 and a cutter head body 170, and the bottom of the cutter head body 170 is connected to a boring tool body 171 by bolts; the liquid inlet pipe 201 is fixed to the outside of the protective shell 110, and a one-way liquid inlet valve is provided in the middle.

[0031] The main cavity 220 and the compensation cavity 230 are coaxially arranged and are connected to the inlet pipe 201 through the branch pipe 202. By moving the extrusion plate 150 upward, negative pressure is generated inside the main cavity 220 and the compensation cavity 230, and cutting fluid is drawn from the inlet pipe 201 through the corresponding branch pipe 202.

[0032] As shown in Figures 2 to 4, the storage volume of the main cavity 220 accounts for 60% of the storage volume of the liquid storage bladder 210, and its material hardness is Shore A70; the storage volume of the compensation cavity 230 accounts for 40% of the storage volume of the liquid storage bladder 210, and its material hardness is Shore A50.

[0033] The inner wall of the compensation cavity 230 is uniformly provided with multiple nozzles 231 along its circumference; the outer wall of the cutter head 170 is provided with a guide groove 172 along its circumference, and the guide groove 172 has a spiral structure; the outlet position of the nozzle 231 is aligned with the guide groove 172 of the cutter head 170, and the liquid is automatically thrown towards the side with mass loss by using rotational centrifugal force. That is, by using rotational centrifugal force, the liquid can be automatically thrown along the guide groove 172 towards the area where the cutter mass is lighter (i.e., the unbalanced mass side), and the injected liquid mass partially offsets the mass loss in this area, thereby reducing the centrifugal force imbalance through momentum distribution.

[0034] This application achieves adaptive guided flow of cutting fluid and compensates for mass imbalance by partitioning and optimizing the material gradient of the fluid reservoir 210. Specifically, when the extrusion plate 150 applies uniform pressure to the top of the fluid reservoir 210, due to the material gradient (i.e., the outer main cavity 220 is hard and the inner compensation cavity 230 is soft), the soft compensation cavity 230 deforms and is pressurized first. The pressure is transmitted through the extrusion plate 150, while the main cavity 220, due to its hard material resisting deformation, stably flows out of the cutting fluid for cooling. After the compensation cavity 230 is pressurized, the internal cutting fluid is pulsed out through the nozzle 231. At the same time, during the feed process, when the tool vibrates or experiences centrifugal force due to mass eccentricity, since the nozzle 231 is aligned with the spiral guide groove 172 of the cutter head body 170, the centrifugal force can automatically throw the liquid along the guide groove 172 to the side with mass deficiency (such as the light area caused by uneven tool installation) when the cutter head rotates at high speed. From a microscopic perspective, the liquid in the guide channel 172 is subjected to centrifugal acceleration. Driven, the flow moves towards the region with a larger radius of rotation (i.e., the side lacking mass), where... Angular velocity; Let the radius be [radius]. According to the fluid momentum theorem, the rate of change of momentum is related to force (e.g., the dynamic pressure formula). This means that the reaction force generated by the liquid jet can partially offset the centrifugal force. At the same time, the spiral structure of the guide groove 172 can increase the tangential velocity of the liquid, extend the flow path, and enhance the centrifugal separation effect, so that the cutting liquid forms a vortex in the groove, further enhancing the heat exchange with the tool surface.

[0035] Furthermore, since the drain pipe 240 is ball-jointed to the bottom of the protective shell 110, the nozzle can rotate at a corresponding angle as the tool vibrates, enabling the cutting fluid flow path to be adaptively guided; and in conjunction with the nozzle pipe 231 and the spiral guide groove 172, the liquid mass can be distributed to the unbalanced area in real time, offsetting the centrifugal torque, reducing the unevenness of the boring diameter (such as taper or ellipticity), thereby improving the machining accuracy and surface quality.

[0036] As shown in Figures 2 to 8, the main cavity 220 is evenly divided into multiple cavities along its circumference, and each cavity is connected to the corresponding drain pipe 240 through an outlet pipe 221 and a flexible hose 222.

[0037] A metal sheet 250 is provided at the connection between the outlet pipe 221 and the corresponding cavity. The metal sheet 250 is a vibration-sensitive thin metal sheet, and its plane is parallel to the fluid flow direction. When the tool vibrates, the fluid impacts the metal sheet 250, causing oscillations, which changes the fluid resistance inside the pipe and generates a pressure difference. This restricts the discharge from the drain pipe 240 in that area, thus guiding the cutting fluid from the area with larger vibration amplitude to flow out preferentially. In other words, when the tool vibrates, the fluid flow impacts the metal sheet 250, causing periodic oscillations. The flow state inside the pipe changes, increasing turbulence intensity or flow separation, thereby increasing local fluid resistance and generating a pressure gradient. This pressure gradient can restrict the discharge from the area with smaller vibration amplitude and guide the cutting fluid to flow out preferentially from the area with larger amplitude, achieving fluid distribution.

[0038] As shown in Figures 7 and 8, the drain pipe 240 has a tree-like structure, consisting of a main pipe 242 and several branch pipes 243. The main pipe 242 is connected to a main nozzle 244 at its end for conventional cooling. The branch pipes 243 are connected to auxiliary nozzles 245 at their ends for pulse injection.

[0039] The diameter of the main nozzle 244 is three times that of the secondary nozzle 245. By setting the smaller diameter of the secondary nozzle 245, the jet velocity can be enhanced, and the reaction force forms a negative feedback loop (such as when the centrifugal force increases, the jet reaction force increases synchronously), thus achieving a self-stabilizing effect.

[0040] The secondary nozzle 245 is connected to the branch pipe 243 via a ball joint, and the movable axis of the nozzle is always at an angle of 15 to 30 degrees to the rotation axis of the cutter head body 170. The tangential jet of the secondary nozzle 245 generates a reaction force to compensate for the vibration of the boring tool body 171 caused by mass eccentricity. The movable axis of the secondary nozzle 245 is at an angle of 15 to 30 degrees to the rotation axis to optimize the tangential jet direction, so that the reaction force vector is aligned with the node of the vibration mode, thereby effectively counteracting the torque caused by mass eccentricity.

[0041] This application achieves adaptive adjustment of the nozzle direction through the ball joint and multi-cavity configuration of the drain pipe 240. Specifically, when the tool rotates at high speed, if a mass shift causes vibration, the ball joint seat 241 allows the nozzle of the drain pipe 240 to rotate slightly with the vibration, changing the direction of the cutting fluid injection. The multi-cavity configuration allows the cutting fluid to flow out from different outlet pipes 221, and the vibration sensing metal plate 250 changes the fluid resistance or pressure difference in the outlet pipe 221 through oscillation, thereby restricting the discharge of the drain pipe 240 in that area, so that the cutting fluid can be preferentially discharged from the branch pipe 243 of the corresponding drain pipe 240. At the same time, the adaptive nozzle direction of the secondary nozzle 245 can ensure that the cutting fluid is accurately sprayed to the unbalance point (such as the opposite direction of the heavier side), and the centrifugal force is partially offset by the liquid momentum, realizing the automatic distribution of "strong liquid flow in the area of ​​large vibration", and the cutting fluid is concentrated to compensate for the mass loss in the vibration source area.

[0042] Furthermore, the fixed base 100, protective shell 110, air duct 111, push rod 120, moving plate 130, drive motor 140, extrusion plate 150, clamp 160, cutter head body 170, liquid inlet pipe 201, and springs shown in Figures 2 and 3 in this application are all referenced from a PCD precision boring tool in patent number CN114669769B, and belong to the prior art. Their specific structure and working principle have been described in detail in the cited patent, so this application will not elaborate further.

[0043] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: The PCD precision boring tool of this application, through the partitioning of the reservoir 210 (i.e., the main cavity 220 and the compensation cavity 230) and the optimization of the material gradient, can achieve the coordinated output of cutting fluid pulses and base flow under the action of the extrusion plate 150; the ball joint seat 241 of the drain pipe 240 can realize the automatic rotation of the nozzle with vibration, and generate a reaction force in conjunction with the tangential spray of the tree-shaped branch pipe 243; the vibration sensing mechanism of the metal sheet 250 guides the fluid flow to preferentially compensate the vibration source area; and the spiral structure of the guide groove 172 uses centrifugal force to automatically distribute the liquid mass, achieving dynamic balance with the cutting fluid as the medium; thus, it achieves the technical effects of cutting fluid adaptive guiding flow, automatic compensation, vibration reduction, improved machining accuracy, and extended tool life.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A PCD precision boring tool, comprising a fixed base (100), a protective shell (110), an air guide pipe (111), a push rod (120), a moving plate (130), a drive motor (140), a pressing plate (150), a clamp (160), a tool head body (170), an injection unit (200), and a liquid inlet pipe (201), characterized in that: The injection unit (200) includes a reservoir (210) and a drain pipe (240); the reservoir (210) is fixed below the extrusion plate (150) and coaxially arranged with the cutter head (170); the reservoir (210) is divided into two parts, namely a main cavity (220) and a compensation cavity (230); multiple drain pipes (240) are provided, evenly arranged around the circumference of the main cavity (220) and passing through a hose (222) and an outlet pipe (240) in sequence. 21) It is connected to the inside of the main cavity (220); the drain pipe (240) is rotatably connected to the bottom of the protective shell (110) through the ball joint seat (241), and a one-way drain valve is provided inside it, which allows the nozzle of the drain pipe (240) to rotate at a corresponding angle with the vibration of the tool, ensuring that the spray direction is adaptive, so that the cutting fluid is preferentially sprayed in the opposite direction of the vibration displacement. The momentum reaction force generated by the liquid spray partially offsets the centrifugal torque caused by the mass eccentricity, thereby suppressing the vibration.

2. The PCD precision boring tool as described in claim 1, characterized in that, The protective shell (110) is fixed to the bottom of the fixed base (100); the bottom of the fixed base (100) is fixed with a push rod (120), a moving plate (130), a drive motor (140), a pressing plate (150), a clamp (160) and a cutter head body (170) from top to bottom; the bottom of the cutter head body (170) is connected to a boring bar body (171) by bolts; the liquid inlet pipe (201) is fixed to the outside of the protective shell (110) and a one-way liquid inlet valve is provided in the middle.

3. The PCD precision boring tool as described in claim 1, characterized in that, The main cavity (220) and the compensation cavity (230) are coaxially arranged and are connected to the inlet pipe (201) through the branch pipe (202). By moving the extrusion plate (150) upward, negative pressure is generated inside the main cavity (220) and the compensation cavity (230), and cutting fluid is drawn from the inlet pipe (201) through the corresponding branch pipe (202).

4. A PCD precision boring tool as described in claim 3, characterized in that, The main cavity (220) has a storage volume that accounts for 60% of the storage volume of the liquid reservoir (210), and its material hardness is Shore A70; the compensation cavity (230) has a storage volume that accounts for 40% of the storage volume of the liquid reservoir (210), and its material hardness is Shore A50.

5. A PCD precision boring tool as described in claim 4, characterized in that, The inner wall of the compensation cavity (230) is uniformly provided with a plurality of nozzles (231) along its circumference; the outer wall of the cutter disc body (170) is provided with a guide groove (172) along its circumference, and the guide groove (172) has a spiral structure; the outlet position of the nozzle (231) is aligned with the guide groove (172) of the cutter disc body (170), and the liquid is automatically thrown to the side with mass loss by using the centrifugal force of rotation.

6. A PCD precision boring tool as described in claim 4, characterized in that, The main cavity (220) is evenly divided into multiple cavities along its circumference, and each cavity is connected to the corresponding drain pipe (240) through an outlet pipe (221) and a flexible hose (222).

7. A PCD precision boring tool as described in claim 6, characterized in that, A metal sheet (250) is provided at the connection between the outlet pipe (221) and the corresponding cavity. The metal sheet (250) is a vibration-sensitive metal sheet. The plane direction of the metal sheet (250) is parallel to the fluid flow direction. When the tool vibrates, the fluid impacts the metal sheet (250) and causes oscillation, which changes the fluid resistance in the pipe and generates a pressure difference, thereby restricting the discharge of the drain pipe (240) in this area, thereby guiding the cutting fluid in the area with large vibration amplitude to flow out preferentially.

8. A PCD precision boring tool as described in claim 6, characterized in that, The drain pipe (240) has a tree-like structure and consists of a main pipe (242) and several branch pipes (243). The main pipe (242) is connected to a main nozzle (244) for conventional cooling. The branch pipes (243) are connected to auxiliary nozzles (245) for pulse injection.

9. A PCD precision boring tool as described in claim 8, characterized in that, The diameter of the main nozzle (244) is three times that of the auxiliary nozzle (245).

10. A PCD precision boring tool as described in claim 9, characterized in that, The secondary nozzle (245) is connected to the branch pipe (243) via a ball joint, and the movable axis of the nozzle is always at an angle of 15 to 30 degrees to the rotation axis of the cutter head body (170). The tangential jet of the secondary nozzle (245) generates a reaction force to compensate for the vibration of the boring tool body (171) caused by mass eccentricity.

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