Anti-cutter-breakage machining method for workpiece with side hole in hole wall

Abstract

The invention discloses an anti-breakage cutter machining method for a workpiece with a side hole in the hole wall, and aims to overcome the defects that when the hole wall with the side hole is machined, corner breakage and abrasion of a blade are easily caused, and a sealing rubber ring is easily clamped and damaged in the installation process. The method comprises the following steps that S1, the side hole is filled with a stopper rod, and the end face of the stopper rod is not lower than the hole wall; s2, the workpiece is clamped on a machine tool; s3, the workpiece rotates, and the cutter extends into the hole wall to cut the hole wall; s4, the workpiece is detached, and a sealing ring is installed on the hole wall; and S5, dismounting the stopper rod. When the hole wall with the side hole is machined, the cutter is not prone to corner chipping and abrasion, and the sealing rubber ring is not prone to being clamped and damaged in the installation process.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical processing, and more particularly to a chipping prevention processing method for a workpiece with a hole wall having a side hole. Background Art

[0002] At present, when machining the inner hole of a workpiece with a side hole on the inner wall, the blade is prone to chipping and wear due to intermittent cutting. When installing the sealing rubber ring, it is easy to get stuck at the side hole. The burrs at the side hole are difficult to clean, resulting in damage to the installation of the sealing rubber ring. For example, Chinese patent application No. 202110494163X discloses a hole machining cutting tool and a machining method thereof. The waste chips generated during the blade cutting process can be quickly and smoothly discharged to the outside through the chip removal channel, avoiding the presence of waste chips and affecting the machining quality and efficiency. However, when machining the hole wall with a side hole, the blade is prone to chipping and wear due to intermittent cutting, and the sealing rubber ring is prone to get stuck and damaged during installation. Summary of the Invention

[0003] In order to overcome the above shortcomings, the present invention provides a chipping prevention processing method for a workpiece with a side hole in the hole wall. When processing the hole wall with the side hole, the tool is not prone to chipping or wear, and the sealing rubber ring is not prone to getting stuck or damaged during the installation process.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: a method for preventing chipping of a workpiece with a side hole in the hole wall, comprising the following steps: S1, filling a stopper rod in the side hole, with the end face of the stopper rod not lower than the hole wall; S2, clamping the workpiece on a machine tool; S3, rotating the workpiece, and extending the tool into the hole wall to cut the hole wall; S4, removing the workpiece, and installing a sealing ring on the hole wall; S5, removing the stopper rod.

[0005] Before machining the hole wall of a workpiece with side holes, a stopper is used to fill the side holes. This allows the tool to continuously cut the hole wall, avoiding tool chipping and wear caused by intermittent cutting, preventing tool wear from causing inaccurate precision control, and avoiding burrs and cutting bumps at the side hole openings. After the hole wall is machined, remove the workpiece and wait until the seal is installed before removing the stopper to prevent the seal from getting stuck or breaking during installation.

[0006] As a preferred embodiment, in S1, first connect the fixed plug sleeve to the outer end of the side hole, then insert the plug rod into the fixed plug sleeve, adjust the extended length of the plug rod and then lock the fixed plug sleeve.

[0007] The stopper rod is positioned by fastening the fixed plug sleeve to the side hole, and the stopper rod is reliably installed to prevent the stopper rod from shaking during the cutting process.

[0008] Preferably, a plurality of long grooves are provided on the side wall of the fixed sleeve so as to form a multi-petal clip on the fixed sleeve.

[0009] When the fixed plug sleeve is inserted into the side hole, the clamping plate can move radially to reduce the wear between the clamping plate and the inner wall of the side hole and prevent damage to the inner wall of the side hole. In addition, the clamping piece is clamped onto the plug rod to realize the positioning of the plug rod.

[0010] Preferably, a threaded section is provided on the fixed sleeve, the fixed sleeve is threadedly connected to the side hole via the threaded section, and the long groove is provided in the threaded section.

[0011] The fixed plug sleeve is tightly connected to the side hole through a threaded section, and the connection is convenient and reliable.

[0012] Preferably, the outer wall of the clip is inclined.

[0013] The long groove is arranged on the threaded section. When the fixed plug sleeve is screwed into the side hole, the inclined clamping piece becomes tighter and tighter, thereby clamping the plug rod.

[0014] Preferably, the side hole is in a T-shaped structure, and the end of the fixed plug sleeve is pressed against the transition surface of the inner wall of the side hole to achieve positioning.

[0015] The end of the fixed sleeve is pressed against the transition surface to achieve positioning, and the connection is reliable.

[0016] Preferably, the hardness of the stopper rod and the fixed sleeve is lower than the hardness of the workpiece.

[0017] The hardness of the stopper rod and the fixed sleeve is lower than the hardness of the workpiece, which prevents the workpiece from being damaged during the process of connecting the stopper rod and the fixed sleeve to the workpiece and avoids damage to the tool due to excessive hardness.

[0018] Preferably, an adjustment seat is connected between adjacent fixed plug sleeves, and a plug rod adjustment mechanism is installed on the adjustment seat. The adjustment seat includes a connecting frame and a rotating sleeve connected together. The rotating sleeve is rotatably installed in the fixed plug sleeve. The plug rod is inserted into the fixed plug sleeve and placed in the rotating sleeve. The plug rod and the rotating sleeve are circumferentially locked, and the extended length of the plug rod is adjusted by the plug rod adjustment mechanism.

[0019] The adjustment seat is connected between adjacent fixed sleeves. The adjustment seat is connected to the fixed sleeves via a rotating sleeve. The fixed sleeves are rotatably connected to the rotating sleeve. Therefore, when the fixed sleeve is connected to the side hole, the rotating sleeve and the fixed sleeve move axially along the side hole together. Once the fixed sleeve is in place, the rod extension is adjusted using the rod adjustment mechanism to ensure that the rod end face is not lower than the hole wall. This allows for precise and convenient rod extension adjustment. After a single rod filling operation, it can be reused on workpieces of the same size. The amount of machining performed on the hole wall is minimal, so the rod end face after machining perfectly matches the hole wall shape. After the rod is next inserted into the workpiece side hole, the rod extension is adjusted using the rod adjustment mechanism. The rod and rotating sleeve are circumferentially locked, limiting rod movement to the axial direction of the side hole. Once the rod end is adjusted into place, the rod end face is flush with the workpiece hole wall, resulting in a complete annular surface. This ensures smoother, more evenly distributed force during tool cutting, and reduces the risk of chipping and wear.

[0020] Preferably, the stopper rod adjustment mechanism includes an adjustment sleeve and a return spring. The adjustment sleeve is threadedly connected to the upper part of the rotating sleeve, the upper end of the stopper rod is against the top of the adjustment sleeve, the return spring is abutted between the stopper rod and the rotating sleeve, and the adjustment sleeve is rotated to adjust the extension length of the stopper rod.

[0021] Under the action of the return spring, the end of the stopper rod presses against the top surface of the adjustment sleeve to achieve the positioning of the stopper rod. When adjusting the stopper rod, the adjustment sleeve is rotated, and the downward rotation of the adjustment sleeve pushes the stopper rod downward to the adjustment position, making adjustment convenient and reliable.

[0022] Another solution is that the stopper rod adjustment mechanism includes a worm, two turbines, and two driven gears. The worm is connected between the two turbines, a driving gear is provided on the turbine, a rack is provided on the outer wall of the stopper rod, and the driven gear is meshed and transmitted between the rack and the driving gear; the worm is rotated to adjust the extension length of the stopper rod.

[0023] When adjusting the stopper rod position, the worm is rotated, which in turn drives the two turbines, which in turn drive the two driven gears. The meshing of the driven gears and the rack drives the stopper rod, ensuring reliable adjustment. Furthermore, the worm and worm drive mechanism has a self-locking function, preventing the stopper rod from shaking during the cutting process.

[0024] Compared with the prior art, the present invention has the following beneficial effects: (1) when machining the hole wall with a side hole, the tool is not prone to chipping or wear, and the sealing rubber ring is not prone to getting stuck or breaking during the installation process; (2) the positioning of the plug rod is achieved by fastening the fixed plug sleeve to the side hole, the plug rod is reliably installed, and the plug rod shaking is prevented during the cutting process; (3) during the process of inserting the fixed plug sleeve into the side hole, the clamping plate can move radially, reducing the wear between the clamping plate and the inner wall of the side hole and preventing damage to the inner wall of the side hole, and the inclined clamping plate becomes tighter and tighter, thereby clamping the plug rod; (4) the hardness of the plug rod and the fixed plug sleeve is lower than the hardness of the workpiece, preventing the workpiece from being damaged during the process of connecting the plug rod and the fixed plug sleeve to the workpiece, and avoiding damage to the tool due to excessive hardness; (5) the plug rod extension length is adjusted by the plug rod adjustment mechanism, and the adjustment is accurate and convenient; after the end of the plug rod is adjusted into place, the end face of the plug rod can be flush with the hole wall of the workpiece, thereby forming a complete annular surface, which is smoother and more evenly stressed during the tool cutting process, and is not prone to chipping or wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a cross-sectional view of Example 1 of the present invention.

[0026] Figure 2 This is a structural diagram of a fixed sleeve according to embodiment 1 of the present invention.

[0027] Figure 3 It is a partial cross-sectional view of Example 2 of the present invention.

[0028] Figure 4 This is a partial cross-sectional view of Example 3 of the present invention.

[0029] Figure 5 It is a partial cross-sectional view of Example 4 of the present invention.

[0030] In the figure: 1. workpiece, 2. hole wall, 3. side hole, 4. stopper rod, 5. fixed sleeve, 6. long groove, 7. clip, 8. threaded section, 9. adjusting seat, 10. connecting frame, 11. rotating sleeve, 12. stopper rod adjustment mechanism, 13. reaming, 14. limiting ring, 15. anti-rotation groove, 16. anti-rotation rib, 17. adjusting sleeve, 18. return spring, 19. top cover, 20. worm, 21. turbine, 22. driven gear, 23. driving gear, 24. rack, 25. turntable, 26. rotary handle, 27. lifting and lowering plate, 28. guide rod, 29. screw. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1: A chipping prevention method for machining a workpiece with a side hole in the hole wall (see Figure 1 、 Figure 2), including the following steps: S1, filling the side hole 3 with a stopper rod 4, with the end surface of the stopper rod 4 not lower than the hole wall 2. The workpiece 1 has two side holes 3 on the top and two side holes 3 on the bottom. The two side holes 3 on the top and the two side holes 3 on the bottom are arranged opposite to each other, and each side hole 3 is filled with a stopper rod 4. During S1, a fixed plug sleeve 5 is first connected to the outer end of the side hole 3, and then the stopper rod 4 is inserted into the fixed plug sleeve 5. After adjusting the extended length of the stopper rod 4, the fixed plug sleeve 5 is locked. The fixed plug sleeve 5 is fastened to the side hole 3 to achieve the positioning of the stopper rod 4. The stopper rod 4 is reliably installed to prevent the stopper rod 4 from shaking during the cutting process. The hardness of the stopper rod 4 and the fixed plug sleeve 5 is lower than that of the workpiece 1. The hardness of the stopper rod 4 and the fixed plug sleeve 5 is lower than that of the workpiece 1, which prevents the workpiece 1 from being damaged during the process of the stopper rod 4 and the fixed plug sleeve 5 being connected to the workpiece 1, and avoids damage to the tool caused by excessive hardness. In this embodiment, the stopper rod 4 and the fixed plug sleeve 5 are both made of polytetrafluoroethylene.

[0032] Several elongated grooves 6 are formed in the sidewall of the fixed sleeve 5, forming a multi-lobed clip 7 that clamps onto the stopper rod 4. In this embodiment, four elongated grooves 6 are evenly spaced, forming a four-lobed clip 7. The fixed sleeve 5 is provided with a threaded section 8 at its lower portion. The fixed sleeve 5 is threadedly connected to the side hole 3 via the threaded section 8, and the elongated grooves 6 are located in the threaded section 8. The outer wall of the clip 7 is inclined. The side hole 3 is T-shaped, and the end of the fixed sleeve 5 rests on the transition surface of the inner wall of the side hole 3 to achieve positioning.

[0033] When the fixed plug sleeve 5 is installed into the side hole 3, the clamping plate can move radially to reduce the wear between the clamping plate and the inner wall of the side hole 3 and prevent damage to the inner wall of the side hole 3. In addition, the inclined clamping piece 7 becomes tighter and tighter, thereby clamping the plug rod 4.

[0034] S2, clamping the workpiece 1 onto the machine tool; clamping the workpiece 1 onto the three-jaw chuck, and the three-jaw chuck fixes the workpiece 1.

[0035] S3, the machine tool drives the workpiece 1 to rotate, and the tool extends into the hole wall 2 to cut the hole wall 2. During processing, rough processing is performed first, and then fine processing is performed.

[0036] S4, remove the workpiece 1 and install the sealing ring on the hole wall 2.

[0037] S5, remove the stopper rod 4. Rotate the fixed sleeve 5 and remove the fixed sleeve 5 from the side hole 3. The stopper rod 4 and the fixed sleeve 5 are removed together. The removed stopper rod 4 and the fixed sleeve 5 can be reused to process the hole wall 2 of the next workpiece 1.

[0038] Before machining the hole wall 2 of the workpiece 1 with the side hole 3, a stopper rod 4 is used to fill the side hole 3. This allows the tool to continuously cut the hole wall 2, avoiding tool chipping and wear caused by intermittent cutting, preventing tool wear from causing inaccurate control of precision, and avoiding burrs and cutting bumps at the mouth of the side hole 3. After machining the hole wall 2, the workpiece 1 is removed, and the stopper rod 4 is removed after the sealing ring is installed to prevent the sealing ring from getting stuck or breaking during installation.

[0039] Example 2: A chipping prevention method for machining a workpiece with a side hole in the hole wall (see Figure 3 ), including the following steps: S1, filling the side hole 3 with a stopper rod 4, the end face of the stopper rod 4 is not lower than the hole wall 2, the workpiece 1 has two side holes 3 on the top and two side holes 3 on the bottom, the two side holes 3 on the top and the two side holes 3 on the bottom are arranged opposite to each other, and each side hole 3 is filled with a stopper rod 4. During S1, first connect the fixed plug sleeve 5 to the outer end of the side hole 3, then insert the stopper rod 4 into the fixed plug sleeve 5, adjust the extended length of the stopper rod 4 and then lock the fixed plug sleeve 5. The stopper rod 4 is positioned by fastening the fixed plug sleeve 5 to the side hole 3, and the stopper rod 4 is reliably installed to prevent the stopper rod 4 from shaking during the cutting process. The hardness of the stopper rod 4 and the fixed plug sleeve 5 are both lower than the hardness of the workpiece 1. The hardness of the stopper rod 4 and the fixed plug sleeve 5 are both lower than the hardness of the workpiece 1, which prevents the workpiece 1 from being damaged during the process of the stopper rod 4 and the fixed plug sleeve 5 being connected to the workpiece 1, and avoids damage to the tool due to excessive hardness.

[0040] A plurality of long grooves 6 are provided on the side wall of the fixed sleeve 5 to form a multi-petal clip 7 on the fixed sleeve 5, with a gap left between the inner wall of the clip 7 and the outer wall of the plug rod 4. In this embodiment, four long grooves 6 are evenly distributed, thereby forming a four-petal clip 7. A threaded section 8 is provided on the fixed sleeve 5, and the threaded section 8 is provided at the lower part of the fixed sleeve 5. The fixed sleeve 5 is threadedly connected to the side hole 3 through the threaded section 8, and the long grooves 6 are provided on the threaded section 8. The outer wall of the clip 7 is inclined. The side hole 3 is a T-shaped structure, and the end of the fixed sleeve 5 is pressed against the transition surface of the inner wall of the side hole 3 to achieve positioning. During the process of installing the fixed sleeve 5 into the side hole 3, the clamp can move radially to reduce the wear between the clamp and the inner wall of the side hole 3 and prevent damage to the inner wall of the side hole 3.

[0041] An adjustment seat 9 is connected between two axially adjacent fixed sleeves 5. A stopper rod adjustment mechanism 12 is mounted on the adjustment seat 9. The adjustment seat 9 comprises a connecting frame 10 and two rotating sleeves 11, each rotatably mounted within the adjacent fixed sleeves 5. A counterbore 13 is provided on the inner wall of the fixed sleeve 5, and the rotating sleeve 11 is rotatably mounted within the counterbore 13. A retaining ring 14 is fastened to the upper end of the fixed sleeve 5, and the rotating sleeve 11 is axially restrained between the bottom surface of the counterbore 13 and the retaining ring 14. The stopper rod 4 is inserted into the fixed sleeve 5 and placed within the rotating sleeve 11. The stopper rod 4 and the rotating sleeve 11 are circumferentially locked. Anti-rotation grooves 15 are provided on the outer wall of the stopper rod 4, and anti-rotation ridges 16 are provided on the inner wall of the rotating sleeve 11. The anti-rotation ridges 16 are movably inserted into the anti-rotation grooves 15, allowing axial sliding and circumferential locking. The extended length of the stopper rod 4 can be adjusted using the stopper rod adjustment mechanism 12.

[0042] The stopper rod adjustment mechanism 12 comprises an adjustment sleeve 17 and a return spring 18. The adjustment sleeve 17 is threaded onto the upper portion of the rotating sleeve 11. The upper end of the stopper rod 4 rests on the top of the adjustment sleeve 17. The return spring 18 abuts between the stopper rod 4 and the rotating sleeve 11. The adjustment sleeve 17 is rotated to adjust the extension of the stopper rod 4. The upper end of the stopper rod 4 is securely connected to the top cover 19. The return spring 18 abuts between the upper end of the rotating sleeve 11 and the top cover 19, and the push rod abuts the top of the adjustment sleeve 17. A scale mark is provided on the outer wall of the rotating sleeve 11 to facilitate observation of the screw-in depth of the adjustment sleeve 17, thereby precisely controlling the extension of the stopper rod 4.

[0043] The adjusting seat 9 is connected between adjacent fixed sleeves 5. The adjusting seat 9 is connected to the fixed sleeve 5 through the rotating sleeve 11. The fixed sleeve 5 is rotatably connected to the rotating sleeve 11. Therefore, in the process of the fixed sleeve 5 being connected to the side hole 3, the rotating sleeve 11 and the fixed sleeve 5 move axially along the side hole 3 together. After the fixed sleeve 5 is installed in place, the extended length of the stopper rod 4 is adjusted by the stopper rod adjusting mechanism 12 so that the end face of the stopper rod 4 is not lower than the hole wall 2. The extended length of the stopper rod 4 can be adjusted accurately and conveniently. After completing one filling, the stopper rod 4 is reused on the workpiece 1 of the same size, and the amount of cutting processing of the hole wall 2 is very small. Therefore, the end face shape of the stopper rod 4 after the hole wall 2 is processed is completely matched with the shape of the hole wall 2. After the stopper rod 4 is installed into the side hole 3 of the workpiece 1 for the next time, the extension length of the stopper rod 4 is adjusted by the stopper rod adjustment mechanism 12, and the stopper rod 4 and the rotating sleeve 11 are locked circumferentially. The stopper rod 4 can only move axially along the side hole 3. After the end of the stopper rod 4 is adjusted into place, the end face of the stopper rod 4 can be flush with the hole wall 2 of the workpiece 1, thereby forming a complete annular surface. During the tool cutting process, it is smoother, the force is more evenly distributed, and it is not easy to break or wear.

[0044] S2, clamping the workpiece 1 onto the machine tool; clamping the workpiece 1 onto the three-jaw chuck, and the three-jaw chuck fixes the workpiece 1.

[0045] S3, the machine tool drives the workpiece 1 to rotate, and the tool extends into the hole wall 2 to cut the hole wall 2. During processing, rough processing is performed first, and then fine processing is performed.

[0046] S4, remove the workpiece 1 and install the sealing ring on the hole wall 2.

[0047] S5, remove the stopper rod 4. Rotate the fixed sleeve 5 and remove the fixed sleeve 5 from the side hole 3. The stopper rod 4 and the fixed sleeve 5 are removed together. The removed stopper rod 4 and the fixed sleeve 5 can be reused to process the hole wall 2 of the next workpiece 1.

[0048] Before machining the hole wall 2 of the workpiece 1 with the side hole 3, a stopper rod 4 is used to fill the side hole 3. This allows the tool to continuously cut the hole wall 2, avoiding tool chipping and wear caused by intermittent cutting, preventing tool wear from causing inaccurate control of precision, and avoiding burrs and cutting bumps at the mouth of the side hole 3. After machining the hole wall 2, the workpiece 1 is removed, and the stopper rod 4 is removed after the sealing ring is installed to prevent the sealing ring from getting stuck or breaking during installation.

[0049] Example 3: A chipping prevention method for machining a workpiece with a side hole in the hole wall (see Figure 4 ), including the following steps: S1, filling the side hole 3 with a stopper rod 4, the end face of the stopper rod 4 is not lower than the hole wall 2, the workpiece 1 has two side holes 3 on the top and two side holes 3 on the bottom, the two side holes 3 on the top and the two side holes 3 on the bottom are arranged opposite to each other, and each side hole 3 is filled with a stopper rod 4. During S1, first connect the fixed plug sleeve 5 to the outer end of the side hole 3, then insert the stopper rod 4 into the fixed plug sleeve 5, adjust the extended length of the stopper rod 4 and then lock the fixed plug sleeve 5. The stopper rod 4 is positioned by fastening the fixed plug sleeve 5 to the side hole 3, and the stopper rod 4 is reliably installed to prevent the stopper rod 4 from shaking during the cutting process. The hardness of the stopper rod 4 and the fixed plug sleeve 5 are both lower than the hardness of the workpiece 1. The hardness of the stopper rod 4 and the fixed plug sleeve 5 are both lower than the hardness of the workpiece 1, which prevents the workpiece 1 from being damaged during the process of the stopper rod 4 and the fixed plug sleeve 5 being connected to the workpiece 1, and avoids damage to the tool due to excessive hardness.

[0050] A plurality of long grooves 6 are provided on the side wall of the fixed sleeve 5 to form a multi-petal clip 7 on the fixed sleeve 5, with a gap left between the inner wall of the clip 7 and the outer wall of the plug rod 4. In this embodiment, four long grooves 6 are evenly distributed, thereby forming a four-petal clip 7. A threaded section 8 is provided on the fixed sleeve 5, and the threaded section 8 is provided at the lower part of the fixed sleeve 5. The fixed sleeve 5 is threadedly connected to the side hole 3 through the threaded section 8, and the long grooves 6 are provided on the threaded section 8. The outer wall of the clip 7 is inclined. The side hole 3 is a T-shaped structure, and the end of the fixed sleeve 5 is pressed against the transition surface of the inner wall of the side hole 3 to achieve positioning. During the process of installing the fixed sleeve 5 into the side hole 3, the clamp can move radially to reduce the wear between the clamp and the inner wall of the side hole 3 and prevent damage to the inner wall of the side hole 3.

[0051] An adjustment seat 9 is connected between two axially adjacent fixed sleeves 5. A stopper rod adjustment mechanism 12 is mounted on the adjustment seat 9. The adjustment seat 9 comprises a connecting frame 10 and two rotating sleeves 11, each rotatably mounted within the adjacent fixed sleeves 5. A counterbore 13 is provided on the inner wall of the fixed sleeve 5, and the rotating sleeve 11 is rotatably mounted within the counterbore 13. A retaining ring 14 is fastened to the upper end of the fixed sleeve 5, and the rotating sleeve 11 is axially restrained between the bottom surface of the counterbore 13 and the retaining ring 14. The stopper rod 4 is inserted into the fixed sleeve 5 and placed within the rotating sleeve 11. The stopper rod 4 and the rotating sleeve 11 are circumferentially locked. Anti-rotation grooves 15 are provided on the outer wall of the stopper rod 4, and anti-rotation ridges 16 are provided on the inner wall of the rotating sleeve 11. The anti-rotation ridges 16 are movably inserted into the anti-rotation grooves 15, allowing axial sliding and circumferential locking. The extended length of the stopper rod 4 can be adjusted using the stopper rod adjustment mechanism 12.

[0052] The stopper rod adjustment mechanism 12 comprises a worm 20, two turbines 21, and two driven gears 22. The worm 20, turbines 21, and driven gears 22 are all rotatably mounted on the connecting frame 10. The worm 20 is drivingly connected between the two turbines 21. A driving gear 23 is mounted on the turbines 21, and a rack 24 is mounted on the outer wall of the stopper rod 4. The driven gear 22 meshes and drives between the rack 24 and the driving gear 23. Rotation of the worm 20 adjusts the extension length of the stopper rod 4. A turntable 25 is mounted on the worm 20, and a handle 26 is connected to the turntable 25. The worm 20 is rotated by hand by turning the handle 26. Scale lines are provided on the stopper rod 4 for easy observation of the extension length of the stopper rod 4. To adjust the position of the stopper rod 4, the worm 20 is rotated, thereby rotating the two turbines 21. The two turbines 21 respectively rotate the two driven gears 22. The meshing transmission between the driven gears 22 and the rack 24 drives the stopper rod 4 to move, ensuring reliable adjustment. Moreover, the transmission cooperation between the turbine 21 and the worm 20 has a self-locking function, which prevents the stopper rod 4 from shaking during the cutting process.

[0053] The adjusting seat 9 is connected between adjacent fixed sleeves 5. The adjusting seat 9 is connected to the fixed sleeve 5 through the rotating sleeve 11. The fixed sleeve 5 is rotatably connected to the rotating sleeve 11. Therefore, in the process of the fixed sleeve 5 being connected to the side hole 3, the rotating sleeve 11 and the fixed sleeve 5 move axially along the side hole 3 together. After the fixed sleeve 5 is installed in place, the extended length of the stopper rod 4 is adjusted by the stopper rod adjusting mechanism 12 so that the end face of the stopper rod 4 is not lower than the hole wall 2. The extended length of the stopper rod 4 can be adjusted accurately and conveniently. After completing one filling, the stopper rod 4 is reused on the workpiece 1 of the same size, and the amount of cutting processing of the hole wall 2 is very small. Therefore, the end face shape of the stopper rod 4 after the hole wall 2 is processed is completely matched with the shape of the hole wall 2. After the stopper rod 4 is installed into the side hole 3 of the workpiece 1 for the next time, the extension length of the stopper rod 4 is adjusted by the stopper rod adjustment mechanism 12, and the stopper rod 4 and the rotating sleeve 11 are locked circumferentially. The stopper rod 4 can only move axially along the side hole 3. After the end of the stopper rod 4 is adjusted into place, the end face of the stopper rod 4 can be flush with the hole wall 2 of the workpiece 1, thereby forming a complete annular surface. During the tool cutting process, it is smoother, the force is more evenly distributed, and it is not easy to break or wear.

[0054] S2, clamping the workpiece 1 onto the machine tool; clamping the workpiece 1 onto the three-jaw chuck, and the three-jaw chuck fixes the workpiece 1.

[0055] S3, the machine tool drives the workpiece 1 to rotate, and the tool extends into the hole wall 2 to cut the hole wall 2. During processing, rough processing is performed first, and then fine processing is performed.

[0056] S4, remove the workpiece 1 and install the sealing ring on the hole wall 2.

[0057] S5, remove the stopper rod 4. Rotate the fixed sleeve 5 and remove the fixed sleeve 5 from the side hole 3. The stopper rod 4 and the fixed sleeve 5 are removed together. The removed stopper rod 4 and the fixed sleeve 5 can be reused to process the hole wall 2 of the next workpiece 1.

[0058] Before machining the hole wall 2 of the workpiece 1 with the side hole 3, a stopper rod 4 is used to fill the side hole 3. This allows the tool to continuously cut the hole wall 2, avoiding tool chipping and wear caused by intermittent cutting, preventing tool wear from causing inaccurate control of precision, and avoiding burrs and cutting bumps at the mouth of the side hole 3. After machining the hole wall 2, the workpiece 1 is removed, and the stopper rod 4 is removed after the sealing ring is installed to prevent the sealing ring from getting stuck or breaking during installation.

[0059] Example 4: A chipping prevention method for machining a workpiece with a side hole in the hole wall (see Figure 5), including the following steps: S1, filling the side hole 3 with a stopper rod 4, the end face of the stopper rod 4 is not lower than the hole wall 2, the workpiece 1 has two side holes 3 on the top and two side holes 3 on the bottom, the two side holes 3 on the top and the two side holes 3 on the bottom are arranged opposite to each other, and each side hole 3 is filled with a stopper rod 4. During S1, first connect the fixed plug sleeve 5 to the outer end of the side hole 3, then insert the stopper rod 4 into the fixed plug sleeve 5, adjust the extended length of the stopper rod 4 and then lock the fixed plug sleeve 5. The stopper rod 4 is positioned by fastening the fixed plug sleeve 5 to the side hole 3, and the stopper rod 4 is reliably installed to prevent the stopper rod 4 from shaking during the cutting process. The hardness of the stopper rod 4 and the fixed plug sleeve 5 are both lower than the hardness of the workpiece 1. The hardness of the stopper rod 4 and the fixed plug sleeve 5 are both lower than the hardness of the workpiece 1, which prevents the workpiece 1 from being damaged during the process of the stopper rod 4 and the fixed plug sleeve 5 being connected to the workpiece 1, and avoids damage to the tool due to excessive hardness.

[0060] A plurality of long grooves 6 are provided on the side wall of the fixed sleeve 5 to form a multi-petal clip 7 on the fixed sleeve 5, with a gap left between the inner wall of the clip 7 and the outer wall of the plug rod 4. In this embodiment, four long grooves 6 are evenly distributed, thereby forming a four-petal clip 7. A threaded section 8 is provided on the fixed sleeve 5, and the threaded section 8 is provided at the lower part of the fixed sleeve 5. The fixed sleeve 5 is threadedly connected to the side hole 3 through the threaded section 8, and the long grooves 6 are provided on the threaded section 8. The outer wall of the clip 7 is inclined. The side hole 3 is a T-shaped structure, and the end of the fixed sleeve 5 is pressed against the transition surface of the inner wall of the side hole 3 to achieve positioning. During the process of installing the fixed sleeve 5 into the side hole 3, the clamp can move radially to reduce the wear between the clamp and the inner wall of the side hole 3 and prevent damage to the inner wall of the side hole 3.

[0061] An adjustment seat 9 is connected between two axially adjacent fixed sleeves 5. A stopper rod adjustment mechanism 12 is mounted on the adjustment seat 9. The adjustment seat 9 comprises a connecting frame 10 and two rotating sleeves 11, each rotatably mounted within the adjacent fixed sleeves 5. A counterbore 13 is provided on the inner wall of the fixed sleeve 5, and the rotating sleeve 11 is rotatably mounted within the counterbore 13. A retaining ring 14 is fastened to the upper end of the fixed sleeve 5, and the rotating sleeve 11 is axially restrained between the bottom surface of the counterbore 13 and the retaining ring 14. The stopper rod 4 is inserted into the fixed sleeve 5 and placed within the rotating sleeve 11. The stopper rod 4 and the rotating sleeve 11 are circumferentially locked. Anti-rotation grooves 15 are provided on the outer wall of the stopper rod 4, and anti-rotation ridges 16 are provided on the inner wall of the rotating sleeve 11. The anti-rotation ridges 16 are movably inserted into the anti-rotation grooves 15, allowing axial sliding and circumferential locking. The extended length of the stopper rod 4 can be adjusted using the stopper rod adjustment mechanism 12.

[0062] The stopper rod adjustment mechanism 12 comprises a lifting plate 27 and a return spring 18. The lifting plate 27 presses against the upper end of the stopper rod 4. A guide rod 28 and a screw 29 are mounted parallel to the connecting frame 10. The lifting plate 27 and the guide rod 28 are flexibly connected, and the screw 29 is threadedly connected to the lifting plate 27. Rotation of the screw 29 drives the lifting plate 27 up and down. The screw 29 is connected to a turntable 25, which is connected to a handle 26. The screw 29 is manually rotated using the handle 26. The upper end of the stopper rod 4 is securely connected to the top cover 19, and the return spring 18 abuts between the upper end of the rotating sleeve 11 and the top cover 19. Scale lines are provided on the outer wall of the stopper rod 4 to facilitate observation of the travel distance of the stopper rod 4, thereby precisely controlling the extension length of the stopper rod 4.

[0063] The adjusting seat 9 is connected between adjacent fixed sleeves 5. The adjusting seat 9 is connected to the fixed sleeve 5 through the rotating sleeve 11. The fixed sleeve 5 is rotatably connected to the rotating sleeve 11. Therefore, in the process of the fixed sleeve 5 being connected to the side hole 3, the rotating sleeve 11 and the fixed sleeve 5 move axially along the side hole 3 together. After the fixed sleeve 5 is installed in place, the extended length of the stopper rod 4 is adjusted by the stopper rod adjusting mechanism 12 so that the end face of the stopper rod 4 is not lower than the hole wall 2. The extended length of the stopper rod 4 can be adjusted accurately and conveniently. After completing one filling, the stopper rod 4 is reused on the workpiece 1 of the same size, and the amount of cutting processing of the hole wall 2 is very small. Therefore, the end face shape of the stopper rod 4 after the hole wall 2 is processed is completely matched with the shape of the hole wall 2. After the stopper rod 4 is installed into the side hole 3 of the workpiece 1 for the next time, the extension length of the stopper rod 4 is adjusted by the stopper rod adjustment mechanism 12, and the stopper rod 4 and the rotating sleeve 11 are locked circumferentially. The stopper rod 4 can only move axially along the side hole 3. After the end of the stopper rod 4 is adjusted into place, the end face of the stopper rod 4 can be flush with the hole wall 2 of the workpiece 1, thereby forming a complete annular surface. During the tool cutting process, it is smoother, the force is more evenly distributed, and it is not easy to break or wear.

[0064] S2, clamping the workpiece 1 onto the machine tool; clamping the workpiece 1 onto the three-jaw chuck, and the three-jaw chuck fixes the workpiece 1.

[0065] S3, the machine tool drives the workpiece 1 to rotate, and the tool extends into the hole wall 2 to cut the hole wall 2. During processing, rough processing is performed first, and then fine processing is performed.

[0066] S4, remove the workpiece 1 and install the sealing ring on the hole wall 2.

[0067] S5, remove the stopper rod 4. Rotate the fixed sleeve 5 and remove the fixed sleeve 5 from the side hole 3. The stopper rod 4 and the fixed sleeve 5 are removed together. The removed stopper rod 4 and the fixed sleeve 5 can be reused to process the hole wall 2 of the next workpiece 1.

[0068] Before machining the hole wall 2 of the workpiece 1 with the side hole 3, a stopper rod 4 is used to fill the side hole 3. This allows the tool to continuously cut the hole wall 2, avoiding tool chipping and wear caused by intermittent cutting, preventing tool wear from causing inaccurate control of precision, and avoiding burrs and cutting bumps at the mouth of the side hole 3. After machining the hole wall 2, the workpiece 1 is removed, and the stopper rod 4 is removed after the sealing ring is installed to prevent the sealing ring from getting stuck or breaking during installation.

[0069] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A method for preventing chipping of a workpiece with a side hole in the hole wall, characterized in that: The following steps are involved: S1, fill the side hole with a stopper rod, with the end face of the stopper rod not lower than the hole wall; S2, clamp the workpiece on the machine tool; S3, rotate the workpiece, and extend the tool into the hole wall to cut the hole wall; S4, remove the workpiece and install the sealing ring on the hole wall; S5, remove the stopper rod.

2. The chipping prevention processing method for a workpiece with a side hole in the hole wall according to claim 1 is characterized in that: In S1, first connect the fixed plug sleeve to the outer end of the side hole, then insert the plug rod into the fixed plug sleeve, adjust the extended length of the plug rod and then lock the fixed plug sleeve.

3. The chipping prevention processing method for a workpiece with a side hole in the hole wall according to claim 2 is characterized in that: A plurality of long grooves are provided on the side wall of the fixed plug sleeve so as to form a multi-petal clip on the fixed plug sleeve.

4. A chipping prevention processing method for a workpiece with a side hole in the hole wall according to claim 3, characterized in that: A threaded section is arranged on the fixed plug sleeve, the fixed plug sleeve is threadedly connected with the side hole through the threaded section, and the long groove is arranged on the threaded section.

5. The chipping prevention processing method for a workpiece with a side hole in the hole wall according to claim 3 is characterized in that: The outer wall of the clip is arranged inclinedly.

6. The chipping prevention processing method for a workpiece with a side hole in the hole wall according to claim 2 is characterized in that: The side hole is in a T-shaped structure, and the end of the fixed plug sleeve is pressed against the transition surface of the inner wall of the side hole to achieve positioning.

7. A chipping prevention processing method for a workpiece with a side hole in the hole wall according to any one of claims 2 to 6, characterized in that: The hardness of the plug rod and the fixed plug sleeve is lower than the hardness of the workpiece.

8. The chipping prevention processing method for a workpiece with a side hole in the hole wall according to claim 2 is characterized in that: An adjusting seat is connected between adjacent fixed plug sleeves, and a plug rod adjustment mechanism is installed on the adjusting seat. The adjusting seat includes a connecting frame and a rotating sleeve connected together. The rotating sleeve is rotatably installed in the fixed plug sleeve. The plug rod is inserted into the fixed plug sleeve and placed in the rotating sleeve. The plug rod and the rotating sleeve are circumferentially locked, and the plug rod extension length is adjusted by the plug rod adjustment mechanism.

9. A chipping prevention processing method for a workpiece with a side hole in the hole wall according to claim 8, characterized in that: The stopper rod adjustment mechanism includes an adjusting sleeve and a return spring. The adjusting sleeve is threadedly connected to the upper part of the rotating sleeve. The upper end of the stopper rod is against the top of the adjusting sleeve. The return spring abuts between the stopper rod and the rotating sleeve. The adjusting sleeve rotates to adjust the extension length of the stopper rod.

10. A chipping prevention processing method for a workpiece with a side hole in the hole wall according to claim 8, characterized in that: The stopper rod adjustment mechanism includes a worm, two turbines, and two driven gears. The worm is connected between the two turbines, a driving gear is provided on the turbine, a rack is provided on the outer wall of the stopper rod, and the driven gear is meshed and transmitted between the rack and the driving gear; the worm is rotated to adjust the extension length of the stopper rod.

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