A profile milling cutter for precision machining of a sealed combined hole

Abstract

The present application relates to the technical fields of sealing combination hole forming milling cutter processing, in particular to a forming milling cutter for precision machining of sealing combination hole, comprising a cutter bar body, a plurality of axial guide anti-rotation members are fixedly installed on the side surface of the cutter bar body, the axial guide anti-rotation members are uniformly and spirally fixedly installed on the cutter bar body, an upper forming cutter fixing body is slidably installed on the axial guide anti-rotation members, a plurality of cutter bar anti-rotation key grooves are formed in the upper forming cutter fixing body, the cutter bar anti-rotation key grooves are in surface contact with the axial guide anti-rotation members, and the upper forming cutter fixing body is locked without axial movement gap after distance adjustment, the axial guide anti-rotation members are uniformly and spirally arranged, axial sliding guide and circumferential anti-rotation limiting dual functions are realized, the problems of cutter head deflection and blade phase dislocation during distance adjustment and cutting process are eliminated, the coaxial precision and contour alignment of the sealing combination hole multi-step machining are ensured from the structural root, and the machining requirements of no leakage and no eccentricity of the precision sealing element are met.

Description

Technical Field

[0001] This invention relates to a forming milling cutter device for precision machining of sealing combination holes, belonging to the field of forming milling cutter technology for sealing combination holes. Background Technology

[0002] In the fields of mechanical manufacturing, hydraulics and pneumatics, valves and pipe fittings and precision equipment, sealing combination holes are key structures for achieving sealed assembly, leakage prevention and positioning of parts. They are usually composed of an upper sealing groove, multi-stage stepped holes and a bottom reference hole. They have extremely high requirements for machining dimensional accuracy, roundness, coaxiality and hole wall smoothness, which directly determine the sealing performance of subsequent sealing components and the reliability of the whole machine.

[0003] Existing adjustable forming milling cutter axial positioning structures mostly use ordinary guide rod clearance fits and lack dedicated anti-rotation guide structures. After the tool is adjusted and locked, axial movement and circumferential slippage are easy to occur. During high-speed cutting, the cutting force impact can easily cause positional displacement, resulting in excessive axial depth of the combined hole, large coaxiality deviation of the upper and lower holes, difficulty in controlling machining accuracy, and high scrap rate.

[0004] Therefore, there is an urgent need to improve a forming milling cutter device for precision machining of sealing combination holes in order to solve the above-mentioned problems. Summary of the Invention

[0005] To achieve the above objectives, the main technical solution adopted by the present invention includes a tool holder body, wherein a plurality of axial guide anti-rotation components are fixedly installed on the side of the tool holder body, the axial guide anti-rotation components are uniformly spirally fixed on the tool holder body, and an upper forming tool fixing body is slidably installed on the axial guide anti-rotation components. A plurality of tool holder anti-rotation keyways are opened inside the upper forming tool fixing body, and the tool holder anti-rotation keyways are in surface contact with the axial guide anti-rotation components to prevent the upper forming tool fixing body from locking without axial movement clearance after adjustment. The axial guide anti-rotation component is threaded, and an upper axial locking sleeve is threadedly connected to the axial guide anti-rotation component. The upper axial locking sleeve is attached to the upper end of the upper forming tool fixing body, and a lower axial locking sleeve is attached to the lower end of the upper forming tool fixing body. The lower axial locking sleeve is threadedly connected to the thread on the axial guide anti-rotation component.

[0006] Preferably, the upper forming tool fixing body has a plurality of evenly distributed sliding grooves, and a blade clamping mechanism is slidably installed on the sliding grooves.

[0007] Preferably, the blade clamping mechanism includes a sliding block and a cutting blade fixing seat. The sliding block is slidably installed inside the sliding groove. A transmission screw is threadedly connected inside the sliding block. A second rotary bearing is fixedly installed at one end of the transmission screw, which is fixedly installed on the upper forming tool fixing body. A first rotary bearing is fixedly installed at the other end of the transmission screw, located at the end away from the second rotary bearing. The first rotary bearing is fixedly installed on the upper forming tool fixing body. A rotating bolt is fixedly installed at one end of the transmission screw, located at the end of the second rotary bearing.

[0008] Preferably, a cutting blade holder is fixedly installed on one side of the sliding block, and a guide locking member is fixedly installed on the upper end of the cutting blade holder. The guide locking member is located on the upper end of the sliding block, and a locking bolt is threadedly connected to one end of the guide locking member. The locking bolt is slidably installed inside the bolt fixing groove, and the threaded end of the locking bolt is pressed against the bottom end of the bolt fixing groove. The locking bolt is used for secondary fixing of the cutting blade holder, and the bolt fixing groove is formed on the upper surface of the upper forming tool fixing body.

[0009] Preferably, a first cutting blade is provided in a groove on the side of the cutting blade holder. The first cutting blade is located on the side away from the sliding block, and the first cutting blade is threadedly connected to the cutting blade holder by a first blade fixing bolt.

[0010] Preferably, a lower tool disc fixing seat is fixedly installed at one end of the tool holder body, and a plurality of lower tool disc anti-rotation guide keys are fixedly installed on the lower tool disc fixing seat, and the lower tool disc anti-rotation guide keys are evenly distributed on the outer side of the lower tool disc fixing seat.

[0011] Preferably, a lower forming tool fixing body is slidably mounted on the lower cutting tool fixing seat, and the groove opened inside the lower forming tool fixing body is tightly fitted to the lower cutting tool anti-rotation guide key.

[0012] Preferably, the lower forming tool fixing body has several grooves on its outer side, and a second cutting blade is fixedly installed in the groove. The second cutting blade is evenly distributed on the outer side of the lower forming tool fixing body, and a second blade fixing bolt is installed inside the second cutting blade. The second blade fixing bolt is threadedly connected to the lower forming tool fixing body.

[0013] Preferably, a lower forming disc positioning groove is provided at the center of the bottom end face of the lower forming tool fixing body, and an end face toothed rat toothed disc mating surface is snapped and installed inside the lower forming disc positioning groove.

[0014] Preferably, a center locking screw is installed through the through hole at the center of the mating surface of the end face toothed rat gear, and the center locking screw is threaded to the center of the tool holder body.

[0015] The present invention has at least the following beneficial effects: This invention employs a uniformly spirally arranged axial guide anti-rotation component to achieve dual functions of axial sliding guidance and circumferential anti-rotation limiting, eliminating problems such as tool disc deflection and tool edge phase misalignment during adjustment and cutting. It ensures the coaxiality accuracy and contour alignment of the multi-step machining of the sealing combination hole from the structural source, meeting the machining requirements of precision sealing components for leak-free and eccentric machining.

[0016] This invention integrates three core functions: guiding, anti-rotation, and locking, by directly opening external threads on the axial guide anti-rotation component body. With the help of upper and lower double locking fixing sleeves, it achieves bidirectional synchronous clamping and locking of the cutter head, completely eliminating the gap defects of traditional single nut single-sided clamping. After locking, there is no axial movement or radial loosening between the cutter head and the cutter bar.

[0017] This invention uses an axial guide anti-rotation component as a sliding reference. The upper forming tool fixing body can slide freely up and down along the axial guide anti-rotation component, and the axial distance between the upper and lower tools can be adjusted arbitrarily, thereby adapting to the processing of sealing combination holes with different step heights and different axial depths. One forming milling cutter can cover workpieces with various step heights, without the need to customize special tools for each step height.

[0018] This invention enables radial micro-precision adjustment by rotating the bolt to drive the cutting blade holder and the first cutting blade. Combined with the adjustable axial position structure of the forming tool holder, one tool can be adapted to the machining of sealing combination holes with different hole diameters and different step depths. There is no need to prepare multiple special forming milling cutters, reducing the number of tools in stock, shortening the product changeover and debugging time, and providing strong flexible production capabilities. Attached Figure Description

[0019] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0020] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the device provided by the present invention; Figure 2 This is a schematic diagram of the upper cutter head structure provided by the present invention; Figure 3 Provided by the present invention Figure 2 Enlarged view of part A; Figure 4 This is a cross-sectional schematic diagram of the upper cutter head structure provided by the present invention; Figure 5 Provided by the present invention Figure 4 Enlarged view of section B; Figure 6 A schematic diagram of the aperture adjustment mechanism provided by the present invention; Figure 7 This is a schematic diagram of the distribution of the upper cutter head clamping structure provided by the present invention; Figure 8 This is a schematic diagram of the lower cutter head structure provided by the present invention; Figure 9 This is a cross-sectional schematic diagram of the lower cutter head structure provided by the present invention.

[0021] In the diagram, 1. Tool holder body; 2. Upper forming tool fixing body; 3. Lower forming tool fixing body; 4. Axial guide anti-rotation component; 5. Upper axial locking fixing sleeve; 6. Tool clamping mechanism; 7. Bolt fixing groove; 8. Locking bolt; 9. Cutting tool fixing seat; 10. First tool fixing bolt; 11. First chip cutter; 12. Tool holder anti-rotation keyway; 13. First rotating bearing; 14. Transmission screw; 15. Second rotating bearing; 16. Sliding groove; 17. Lower axial locking fixing sleeve; 18. Lower forming disc positioning groove; 19. End face toothed toothed disc mating surface; 20. Center locking screw; 21. Second tool fixing bolt; 22. Second chip cutter; 23. Lower tool disc fixing seat; 24. Lower tool disc anti-rotation guide key; 25. Guide locking component; 26. Sliding block; 27. Rotating bolt. Detailed Implementation

[0022] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0023] like Figures 1-9 As shown, this embodiment provides a forming milling cutter for precision machining of sealing combination holes, including a cutter body 1. A plurality of axial guide anti-rotation components 4 are fixedly installed on the side of the cutter body 1. The axial guide anti-rotation components 4 are uniformly spirally fixed on the cutter body 1. An upper forming tool fixing body 2 is slidably installed on the axial guide anti-rotation component 4. A plurality of cutter anti-rotation keyways 12 are opened inside the upper forming tool fixing body 2. The cutter anti-rotation keyways 12 are in surface contact with the axial guide anti-rotation components 4 to prevent the upper forming tool fixing body 2 from locking without axial movement gap after adjustment. The axial guide anti-rotation component 4 has a thread, and an upper axial locking sleeve 5 is threadedly connected to the axial guide anti-rotation component 4. The upper axial locking sleeve 5 is attached to the upper end of the upper forming tool fixing body 2. A lower axial locking sleeve 17 is attached to the lower end of the upper forming tool fixing body 2. The lower axial locking sleeve 17 is threadedly connected to the thread on the axial guide anti-rotation component 4.

[0024] Thus, the axial guide anti-rotation components 4, evenly spirally distributed along the outer side of the tool holder body 1, are assembled into the upper forming tool holder fixing body 2. This ensures that the tool holder anti-rotation keyway 12 inside the upper forming tool holder fixing body 2 forms a surface contact fit with the axial guide anti-rotation component 4, guaranteeing that the upper forming tool holder fixing body 2 can only slide axially linearly along the axial guide anti-rotation component 4. Based on the axial machining dimensions and step depth requirements of the sealing assembly hole to be machined, the upper forming tool holder fixing body 2 is axially pushed along the axial guide anti-rotation component 4 to move it to the set machining position. After the position adjustment is completed, tighten the upper axial locking sleeve 5 and the lower axial locking sleeve 17 connected to the thread on the axial guide anti-rotation component 4 respectively, so that the lower end face of the upper axial locking sleeve 5 is tightly attached to the upper end face of the upper forming tool fixing body 2, and the upper end face of the lower axial locking sleeve 17 is tightly attached to the lower end face of the upper forming tool fixing body 2. Through the upper and lower bidirectional clamping and locking, the upper forming tool fixing body 2 is completely fixed in the set position of the axial guide anti-rotation component 4, completely locking the axial degree of freedom and preventing loosening or displacement during the cutting process.

[0025] Furthermore, such as Figures 1-7 As shown; the upper forming tool fixing body 2 has several evenly distributed sliding grooves 16, and a blade clamping mechanism 6 is slidably installed on the sliding grooves 16; the blade clamping mechanism 6 includes a sliding block 26 and a cutting blade fixing seat 9. The sliding block 26 is slidably installed inside the sliding groove 16, and a transmission screw 14 is threadedly connected inside the sliding block 26. A second rotary bearing 15 is fixedly installed at one end of the transmission screw 14 and is fixedly installed on the upper forming tool fixing body 2. A first rotary bearing 13 is fixedly installed at the other end of the transmission screw 14, located away from the second rotary bearing 15. The first rotary bearing 13 is fixedly installed on the upper forming tool fixing body 2. A rotating bolt 27 is fixedly installed at one end of the transmission screw 14. A cutting blade holder 9 is fixedly installed on one side of the sliding block 26 at one end of the second rotating bearing 15. A guide locking member 25 is fixedly installed on the upper end of the cutting blade holder 9. The guide locking member 25 is located on the upper end of the sliding block 26. A locking bolt 8 is threadedly connected to one end of the guide locking member 25. The locking bolt 8 is slidably installed inside the bolt fixing groove 7. The threaded end of the locking bolt 8 is pressed against the bottom end of the bolt fixing groove 7. The locking bolt 8 is used for secondary fixing of the cutting blade holder 9. The bolt fixing groove 7 is opened on the upper surface of the upper forming tool fixing body 2. A first chip cutter 11 is provided in the groove opened on the side of the cutting blade holder 9. The first chip cutter 11 is located on the side away from the sliding block 26. The first chip cutter 11 is threadedly connected to the cutting blade holder 9 by the first blade fixing bolt 10.

[0026] Thus, according to the inner diameter requirements of the sealing assembly hole to be processed, the rotating bolt 27 is rotated by a tool, driving the transmission screw 14 to rotate smoothly under the support of the first rotating bearing 13 and the second rotating bearing 15; the transmission screw 14 drives the sliding block 26 to make radial feed or retraction along the sliding groove 16 through the threaded engagement, and the sliding block 26 simultaneously drives the cutting tool holder 9 and the first cutting tool 11 to achieve precise adjustment of the radial position until the cutting edge of the first cutting tool 11 reaches the target processing diameter. After the radial position of the first cutting tool 11 is adjusted to the correct position, the locking bolt 8 on the guide locking member 25 is tightened, so that the locking bolt 8 slides along the bolt fixing groove 7 and presses the threaded end against the bottom end of the bolt fixing groove 7; the clamping force of the locking bolt 8 is transmitted to the cutting tool holder 9 through the guide locking member 25, and the cutting tool holder 9... A rigid clamping force is applied to the sliding block 26 as a whole to achieve secondary locking and fixing of the cutting blade fixing seat 9, completely eliminating the thread fit clearance and radial clearance space. When the tool is working, the upper forming tool fixing body 2 rotates at high speed, and the sliding groove 16 drives the sliding block 26, the cutting blade fixing seat 9 and the first cutting blade 11 to rotate synchronously for cutting. Under the action of cutting force, the locking bolt 8 and the guide locking part 25 continue to maintain the clamping state to prevent radial clearance and vibration offset between the cutting blade fixing seat 9 and the first cutting blade 11, ensuring stable cutting dimensions and consistent machining accuracy. When it is necessary to change the machining hole diameter specification, the locking bolt 8 is loosened in the opposite direction to release the clamping and locking of the cutting blade fixing seat 9. The radial position of the first cutting blade 11 can be readjusted by rotating the rotating bolt 27 again. After the adjustment is completed, it is re-locked to achieve rapid changeover and debugging.

[0027] Furthermore, such as Figures 8-9 As shown; a lower cutter head fixing seat 23 is fixedly installed at one end of the cutter head body 1, and several lower cutter head anti-rotation guide keys 24 are fixedly installed on the lower cutter head fixing seat 23. The lower cutter head anti-rotation guide keys 24 are evenly distributed on the outer side of the lower cutter head fixing seat 23; a lower forming tool fixing body 3 is slidably installed on the lower cutter head fixing seat 23, and the groove opened inside the lower forming tool fixing body 3 is tightly fitted to the lower cutter head anti-rotation guide keys 24; several grooves are opened on the outer side of the lower forming tool fixing body 3, and a second chip cutter 22 is fixedly installed in the groove. The second chip cutter 22 are evenly distributed. On the outside of the lower forming tool fixing body 3, a second blade fixing bolt 21 is provided inside the second chip cutter 22. The second blade fixing bolt 21 is threadedly connected to the lower forming tool fixing body 3. A lower forming disc positioning groove 18 is opened at the center of the bottom end face of the lower forming tool fixing body 3. An end face toothed rat toothed disc mating surface 19 is snapped and installed inside the lower forming disc positioning groove 18. A center locking screw 20 is installed through the through hole opened at the center of the end face toothed rat toothed disc mating surface 19. The center locking screw 20 is threadedly connected to the center of the tool holder body 1.

[0028] Thus, the lower forming tool holder 3 is axially pushed along the lower tool disc anti-rotation guide key 24 to the fitting and positioning position, so that the lower forming disc positioning groove 18 opened at the center of the bottom end of the lower forming tool holder 3 is aligned with the assembly station; the end face tooth rat gear mating surface 19 is coaxially snapped into the lower forming disc positioning groove 18, and a circumferential meshing and axial positioning relationship is formed between the end face tooth structure and the lower forming disc positioning groove 18, realizing the synchronous locking of the end face tooth rat gear mating surface 19 and the lower forming tool holder 3; the center locking screw 20 is passed through the through hole opened at the center position of the end face tooth rat gear mating surface 19, and the threaded end of the center locking screw 20 is coaxially tightened into the center threaded hole of the tool holder body 1; as As the center locking screw 20 is gradually tightened, the end face toothed rat gear mating surface 19 is axially pressed, and then the lower forming tool fixing body 3 is pressed and fixed onto the lower cutting disc fixing seat 23 through the lower forming disc positioning groove 18, completing the assembly and locking of the lower forming cutting unit. When it is necessary to disassemble, maintain or replace the second cutting tool 22, the center locking screw 20 is loosened from the center of the tool holder body 1, and the end face toothed rat gear mating surface 19 can be removed. Then the lower forming tool fixing body 3 is axially removed from the lower cutting disc fixing seat 23 along the lower cutting disc anti-rotation guide key 24. After the second cutting tool 22 is worn, the second cutting tool fixing bolt 21 can be loosened directly to replace the cutting tool separately. The disassembly and assembly are convenient and there is no need to replace the whole part.

[0029] The principle of the forming milling cutter for precision machining of sealed combination holes provided in this embodiment is as follows: Multiple sets of axial guide anti-rotation components 4 are evenly distributed spirally on the outer side of the cutter body 1. The upper forming tool fixing body 2 is in surface contact with the axial guide anti-rotation component 4 through the internal cutter anti-rotation keyway 12. The contact and limiting of the keyway with the anti-rotation component restricts the upper forming tool fixing body 2 from circumferential rotation relative to the cutter body 1, allowing it to slide only axially along the axial guide anti-rotation component 4. This structurally eliminates the axial movement gap after adjustment and locking. The axial guide anti-rotation component 4 has threads on its outer circumference, and the upper forming tool fixing body 2 is clamped from both the upper and lower ends by the upper axial locking sleeve 5 and the lower axial locking sleeve 17 respectively. After adjusting to the required axial height, the upper forming tool fixing body 2 is rotated... Two sets of locking sleeves are tightened, and the axial clamping force generated by the threaded locking is used to rigidly lock the upper forming tool fixing body 2 onto the axial guide anti-rotation part 4. During the processing, it is not affected by cutting impact or vibration, and there is no axial displacement or circumferential slippage. External force rotates the rotating bolt 27, which drives the transmission screw 14 to rotate synchronously. Relying on the threaded transmission, the sliding block 26 is driven to slide radially linearly along the sliding groove 16. The sliding block 26 drives the cutting tool fixing seat 9 and the first chip cutter 11 to move radially forward and backward synchronously, realizing precise micro-adjustment of the machining hole diameter. After the adjustment is in place, the locking bolt 8 is tightened. The locking bolt 8 moves down along the bolt fixing groove 7 and presses the bottom of the groove. Through the guide locking part 25, a mechanical clamping secondary lock is formed on the cutting tool fixing seat 9, eliminating the thread gap and The cutting retraction amount is controlled by the first cutting blade 11, which is detachably locked to the cutting blade fixing seat 9 by the first blade fixing bolt 10, enabling independent installation and removal of the blade and individual replacement of worn blades, ensuring that the cutting edge is firmly installed and accurately positioned; the lower cutting disc fixing seat 23 is fixedly connected to the end of the tool holder body 1, and the lower cutting disc anti-rotation guide keys 24 are evenly distributed on its outer side; the inner groove of the lower forming tool fixing body 3 is tightly fitted with the lower cutting disc anti-rotation guide key 24, realizing circumferential anti-rotation and axial sliding assembly, ensuring that the lower forming tool fixing body 3 and the tool holder body 1 rotate coaxially and synchronously without relative torsional offset; the lower forming tool fixing body 3 has a lower forming disc positioning groove 18 at the center of its bottom end, and the end face tooth rat tooth plate mating surface 19 is snapped in the groove, using the end face tooth meshing to achieve high-precision circumferential... The tool holder is positioned; then, the center locking screw 20 passes through the center through hole of the rat tooth plate and is threaded and locked to the center of the tool holder body 1. The end face rat tooth plate mating surface 19 is tightened and pressed from the axial direction, thereby axially and rigidly locking the lower forming tool fixing body 3, preventing axial movement and end face runout during machining, and ensuring high coaxiality of the upper and lower cutting units. Relying on the composite structure of multiple anti-rotation, bidirectional axial locking, secondary clamping of the cutting tool, and rat tooth plate end face positioning and locking, the cutting vibration, backlash and position drift are effectively suppressed, ensuring the machining hole diameter, coaxiality, end face accuracy and sealing assembly requirements. At the same time, the height of the upper forming tool fixing body 2 can be adjusted axially and the radius of the first cutting tool 11 can be adjusted radially to adapt to the flexible machining of sealing combination holes with different hole diameters and different step depths.

[0030] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A forming milling cutter for precision machining of sealing combination holes, comprising a cutter shank body (1), characterized in that: The tool holder body (1) has several axial guide anti-rotation components (4) fixedly installed on the side of the rod body. The axial guide anti-rotation components (4) are evenly spirally fixed on the tool holder body (1). The axial guide anti-rotation components (4) are slidably installed with an upper forming tool fixing body (2). The upper forming tool fixing body (2) has several tool holder anti-rotation keyways (12) inside. The tool holder anti-rotation keyways (12) are in surface contact with the axial guide anti-rotation components (4) to prevent the upper forming tool fixing body (2) from locking without axial movement gap after adjustment. The axial guide anti-rotation component (4) is threaded, and an upper axial locking sleeve (5) is threadedly connected to the axial guide anti-rotation component (4). The upper axial locking sleeve (5) is attached to the upper end of the upper forming tool fixing body (2). A lower axial locking sleeve (17) is attached to the lower end of the upper forming tool fixing body (2). The lower axial locking sleeve (17) is threadedly connected to the thread on the axial guide anti-rotation component (4).

2. The forming milling cutter for precision machining of sealing combination holes according to claim 1, characterized in that: The upper forming tool fixing body (2) is provided with several evenly distributed sliding grooves (16), and a blade clamping mechanism (6) is slidably installed on the sliding grooves (16).

3. A forming milling cutter for precision machining of sealing combination holes according to claim 2, characterized in that: The blade clamping mechanism (6) includes a sliding block (26) and a cutting blade fixing seat (9). The sliding block (26) is slidably installed inside the sliding groove (16). A transmission screw (14) is threadedly connected inside the sliding block (26). A second rotating bearing (15) is fixedly installed at one end of the transmission screw (14). The second rotating bearing (15) is fixedly installed on the upper forming tool fixing body (2). A first rotating bearing (13) is fixedly installed at the other end of the transmission screw (14). The first rotating bearing (13) is located at the end away from the second rotating bearing (15). The first rotating bearing (13) is fixedly installed on the upper forming tool fixing body (2). A rotating bolt (27) is fixedly installed at one end of the transmission screw (14). The rotating bolt (27) is located at one end of the second rotating bearing (15).

4. A forming milling cutter for precision machining of sealing combination holes according to claim 3, characterized in that: A cutting blade holder (9) is fixedly installed on one side of the sliding block (26). A guide locking member (25) is fixedly installed on the upper end of the cutting blade holder (9). The guide locking member (25) is located on the upper end of the sliding block (26). A locking bolt (8) is threadedly connected to one end of the guide locking member (25). The locking bolt (8) is slidably installed inside the bolt fixing groove (7). The threaded end of the locking bolt (8) is pressed against the bottom end of the bolt fixing groove (7). The locking bolt (8) is used for secondary fixing of the cutting blade holder (9). The bolt fixing groove (7) is opened on the upper surface of the upper forming tool fixing body (2).

5. A forming milling cutter for precision machining of sealing combination holes according to claim 4, characterized in that: The first cutting blade (11) is provided in the groove opened on the side of the cutting blade holder (9). The first cutting blade (11) is located on the side away from the sliding block (26). The first cutting blade (11) is threadedly connected to the cutting blade holder (9) by the first blade fixing bolt (10).

6. A forming milling cutter for precision machining of sealing combination holes according to claim 1, characterized in that: The tool holder body (1) is fixedly installed with a lower tool disc fixing seat (23) at one end. A number of lower tool disc anti-rotation guide keys (24) are fixedly installed on the lower tool disc fixing seat (23). The lower tool disc anti-rotation guide keys (24) are evenly distributed on the outside of the lower tool disc fixing seat (23).

7. A forming milling cutter for precision machining of sealing combination holes according to claim 6, characterized in that: The lower forming tool fixing body (3) is slidably installed on the lower cutting tool fixing seat (23), and the groove opened inside the lower forming tool fixing body (3) is tightly fitted to the lower cutting tool anti-rotation guide key (24).

8. A forming milling cutter for precision machining of sealing combination holes according to claim 7, characterized in that: The lower forming tool fixing body (3) has several grooves on its outer side, and a second cutting blade (22) is fixedly installed in the groove. The second cutting blade (22) is evenly distributed on the outer side of the lower forming tool fixing body (3). A second blade fixing bolt (21) is installed inside the second cutting blade (22). The second blade fixing bolt (21) is threadedly connected to the lower forming tool fixing body (3).

9. A forming milling cutter for precision machining of sealing combination holes according to claim 8, characterized in that: The lower forming tool fixing body (3) has a lower forming plate positioning groove (18) at the center of the bottom end face, and the lower forming plate positioning groove (18) has an end face toothed rat tooth plate mating surface (19) inside.

10. A forming milling cutter for precision machining of sealing combination holes according to claim 9, characterized in that: A center locking screw (20) is installed through the through hole at the center of the end face toothed rat tooth plate mating surface (19), and the center locking screw (20) is threaded to the center of the tool holder body (1).

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