A stainless steel pipe inner hole diameter correction processing device and a correction processing technology thereof

Abstract

The application discloses a stainless steel pipe inner hole diameter correction machining device and a correction machining process thereof, which comprises a stand, a clamping assembly, a correction driving assembly and a boring rod group, the correction driving assembly is provided with a first driving motor, a second driving motor, a first rotating wheel, a second rotating wheel, a screw sleeve and a sliding sleeve, the boring rod group comprises a shaft and an expansion cone, the shaft is matched with the screw sleeve and the sliding sleeve to form a rotating guide and axial feeding structure, and the surface of the expansion cone is provided with a spiral thread for inner hole finishing machining of the steel pipe. Through double driving differential control, synchronous rotation, lifting feeding and continuous correction of the boring rod group can be realized, the application not only can process small-diameter steel pipes in stock into large-diameter steel pipes and improve the reuse rate of the steel pipes in stock, but also has the advantages of high machining precision, stable operation and good resource utilization effect.

Description

Technical Field

[0001] This invention relates to the field of steel pipe inner hole processing technology, specifically to a stainless steel pipe inner hole diameter correction processing device and its correction processing technology. Background Technology

[0002] During the production of stainless steel pipes, factors such as processing precision deviations, order adjustments, and specification mismatches can lead to a backlog of finished stainless steel pipes in inventory. Currently, the industry typically handles these inventory pipes by periodically disposing of them as scrap. This not only results in a significant waste of stainless steel raw materials but also increases inventory and scrap disposal costs for companies, contradicting the production principles of energy conservation, emission reduction, and resource recycling.

[0003] The inner hole of traditional stainless steel pipes is formed gradually through a continuous cold rolling process. The core characteristic of this processing method is that it is formed in one go. Once the inner hole diameter is determined, it cannot be adjusted through secondary processing. This technical limitation means that even if the outer diameter of the stainless steel pipes in stock meets some requirements, they cannot be adapted to different application scenarios with different hole diameter requirements because the inner hole diameter is fixed. Ultimately, they can only become scrap and cannot be reused.

[0004] To address the aforementioned inventory waste problem and overcome the technical bottleneck of the inability to perform secondary processing on the inner diameter of traditional stainless steel pipes, a special steel pipe inner diameter correction and processing device has been developed. This device is highly targeted and mainly applicable to finished stainless steel pipes with a length within 50cm. It can perform secondary precision processing on the inner diameter of inventory stainless steel pipes within this specification range.

[0005] The core function of this internal diameter correction processing device is diameter adaptation correction. Specifically, it can enlarge the internal diameter of stainless steel pipes with smaller diameters in inventory through secondary processing. While maintaining the outer diameter of the stainless steel pipe, by precisely correcting the internal diameter, inventory steel pipes with small diameters and thick walls can be processed into finished steel pipes with large diameters and thin walls. This processing method does not require changing the outer diameter of the steel pipe; it only adjusts the internal diameter to allow inventory steel pipes that were originally unsuitable for specific needs to meet the requirements for large-diameter steel pipes in different scenarios, thus realizing the secondary utilization of inventory stainless steel pipes.

[0006] The application of this device not only effectively solves the industry pain points of stainless steel pipe inventory backlog and waste, but also reduces the raw material consumption and inventory costs of enterprises and improves resource utilization. At the same time, by revitalizing inventory through secondary processing, it can also create additional economic benefits for enterprises, which is in line with the development trend of green production and circular economy. Summary of the Invention

[0007] This invention aims to solve the technical problems in the prior art, such as the difficulty in readjusting the inner diameter of stainless steel pipes after forming, the difficulty in reusing stock steel pipes due to the limited hole diameter specifications, and the technical problems of the traditional method of directly inserting a tapered mandrel to expand the hole, such as concentrated force, limited correction accuracy, and insufficient processing stability. The invention proposes a stainless steel pipe inner diameter correction processing device and processing technology to achieve secondary accurate correction of the inner diameter of stock steel pipes, thereby improving resource utilization and processing adaptability.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A stainless steel pipe inner diameter correction processing device includes a stand, a correction drive assembly, and a boring rod assembly. The correction drive assembly is fixedly installed on the surface of the stand and is used to drive the boring rod assembly to perform rotational and lifting movements. The boring rod assembly includes a shaft and an expansion cone disposed at the bottom end of the shaft. By combining the correction drive mechanism with the correction execution mechanism, the device can perform active correction processing on the inner diameter of the stainless steel pipe, which is suitable for the secondary use of stockpiled steel pipes.

[0009] The correction drive assembly includes a fixed base, a first rotating wheel, a second rotating wheel, and a support frame. The first and second rotating wheels are rotatably mounted inside the fixed base, and both have bevel gear rings on their opposing surfaces. A gear hobbing device that meshes with the bevel gear rings is rotatably mounted on the outer side of the support frame. A first drive motor and a second drive motor are located on one side of the fixed base. The outer sides of the first and second rotating wheels have outer ring teeth that are respectively connected to their corresponding drive ends. A threaded sleeve and a sliding sleeve are respectively installed on the inner sides of the first and second rotating wheels. Through the independent drive structure of the two rotating wheels, rotational output and feed adjustment relationships can be established separately, enabling the device to possess composite motion control capabilities.

[0010] The shaft is slidably sleeved within the threaded sleeve and the inner side of the sliding sleeve. The shaft surface has a groove that mates with the sliding sleeve, and the outer side of the shaft has a thread that mates with the threaded sleeve. By combining groove guidance with threaded feed, the speed difference between the two motors can be converted into axial displacement, enabling the boring bar assembly to maintain stable feed while rotating, thus improving the accuracy of inner hole correction.

[0011] In a preferred embodiment, the frame surface is further configured such that a clamping assembly is detachably mounted on it, located directly below the correction drive assembly, for clamping the stainless steel pipe to be processed. This detachable clamping structure allows for adaptation to steel pipes of different lengths and outer diameters, improving equipment versatility and clamping efficiency.

[0012] In a preferred embodiment, the fixed base is further configured such that two sets of transmission gears are provided on its inner side, respectively for power transmission between the first drive motor and the first rotating wheel, and between the second drive motor and the second rotating wheel. The first and second drive motors are geared motors. By reducing speed and increasing torque output, the stability of the driving force during correction machining can be improved, avoiding slippage or loss of steps under low-speed heavy-load conditions.

[0013] In a preferred embodiment, the support frame is further configured as follows: a plurality of hobbing teeth are evenly distributed along the circumference of the frame, and the upper and lower surfaces of each hobbing tooth mesh with the bevel ring teeth of the first and second rotating wheels, respectively. Through the ring support and multi-point bearing method, the running stability of the two rotating wheels can be improved, eccentric wear can be reduced, and the service life of the mechanism can be extended.

[0014] In a preferred embodiment, the expansion cone is further configured such that it has a conical structure and a surface with spiral patterns. When the first drive motor and the second drive motor rotate synchronously in the same direction, they drive the first rotating wheel, the second rotating wheel, the support frame, and the boring rod assembly to rotate synchronously, and the spiral patterns are used to achieve the screw-in insertion into the inner hole of the steel pipe. This screw-in insertion method can reduce the impact load caused by traditional high-pressure insertion and improve the smoothness of insertion.

[0015] In a preferred embodiment, the inner side of the slide sleeve is provided with a sliding key structure that mates with the surface of the slide groove. When the first drive motor and the second drive motor rotate synchronously in opposite directions, they drive the first and second rotating wheels to form relative motion, thereby realizing the lifting and rotating of the boring bar assembly. Through relative motion adjustment, a continuous dressing mode of simultaneous rotation and feeding can be achieved, improving processing efficiency and dimensional consistency.

[0016] In a preferred embodiment, the expansion cone is further configured such that it has a frustum structure with a tapered front end and an expanded rear end, and its outer circumference gradually tapers from the large diameter end to the small diameter end. The spiral pattern extends spirally from the large diameter end to the small diameter end of the expansion cone. By cooperating with the tapered guide surface and the spiral pattern, continuous trimming contact can be formed during the process of entering the inner hole of the steel pipe, reducing the risk of jamming and improving the trimming quality of the inner wall surface.

[0017] This invention also provides a machining process for correcting the inner diameter of stainless steel pipes. Using the aforementioned device, the process includes the following steps: First, the stainless steel pipe to be machined is fixed on the surface of the clamping assembly, and the inner diameter of the pipe is aligned with the boring bar assembly. Then, the first drive motor and the second drive motor are started, causing the boring bar assembly to enter the inner diameter of the pipe. Next, the two drive motors are controlled to rotate asynchronously in opposite directions, and the boring bar assembly is driven to move axially up and down through the threaded engagement between the sleeve and the shaft to correct the inner diameter of the pipe. Afterward, the speed ratio of the two drive motors is adjusted to control the motion ratio between the lifting motion and the rotation, so that the feed speed and the dressing force are adapted to steel pipes of different strengths. Finally, the correction action is repeated until the set dimensional accuracy is achieved, and the boring bar assembly is withdrawn to complete the machining.

[0018] The beneficial effects achieved by this invention are as follows: 1. In this invention, by setting up a steel pipe inner diameter correction processing structure, the existing inner hole of the stock stainless steel pipe can be expanded and corrected for the second time. Under the premise of keeping the outer diameter specification basically unchanged, the inner hole size can be readjusted, so that the stock steel pipe with originally limited specifications can be reused and the reuse rate of stock materials can be improved.

[0019] 2. In this invention, by setting up a dual-power coordinated transmission structure of a first drive motor, a second drive motor, a first rotating wheel, and a second rotating wheel, the rotational motion and axial feed motion of the boring rod group can be controlled separately, so that the device can complete the processing actions such as introduction, correction, and withdrawal within the same mechanism, reducing the traditional multi-station switching process and improving the efficiency and processing continuity of stainless steel pipe inner hole finishing.

[0020] 3. In this invention, by setting an expanding cone with a gradually narrowing truncated cone structure and its surface grooves, a self-guiding spiral advance can be formed when entering the inner hole of the steel pipe, and a continuous support and trimming effect can be generated on the inner wall. This not only facilitates the processing of the inner hole of stainless steel pipes of different specifications, but also reduces jamming and uneven wear, and improves the stability of the device operation and the finished product qualification rate. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention; Figure 2 This is a schematic diagram of the correction drive assembly and boring bar assembly structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the fixing base according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the exploded structure of a modified driving component according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the surface structure of the first and second rotating wheels according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the surface structure of the first rotating wheel according to an embodiment of the present invention; Figure 7 This is a schematic diagram of a boring bar assembly structure according to an embodiment of the present invention.

[0022] Figure label: 100. Frame; 110. Clamping assembly; 200. Correction drive assembly; 210. Fixing base; 211. First drive motor; 212. Second drive motor; 213. Transmission gear set; 220. First rotating wheel; 221. Screw sleeve; 222. Outer ring tooth; 223. Bevel tooth ring; 230. Second rotating wheel; 231. Sliding sleeve; 240. Support frame; 241. Gear hobbing; 300. Boring rod assembly; 310. Shaft; 311. Sliding groove; 312. Thread; 320. Expansion taper; 321. Spiral groove. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0024] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0025] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, a stainless steel pipe inner diameter correction processing device and its correction processing technology.

[0026] Combination Figures 1-7 As shown, the present invention provides a stainless steel pipe inner diameter correction processing device, including a stand 100, a correction drive assembly 200, and a boring rod assembly 300. The correction drive assembly 200 is fixedly installed on the upper part of the stand 100 and is used to output rotational power and axial feed power downward. The boring rod assembly 300 is arranged below the correction drive assembly 200 and facing the steel pipe to be processed. With the above structure, rotational correction and axial feed can be completed in the same mechanism, which is suitable for processes such as stainless steel pipe inner diameter correction, roundness correction, and local burr removal.

[0027] Combination Figure 1 As shown, in this embodiment, the support frame 100 is a portal frame structure with a base at the bottom and a mounting beam at the top to form a stable vertical load-bearing frame. A clamping assembly 110 is detachably installed in the middle of the support frame 100. The clamping assembly 110 is located directly below the correction drive assembly 200 and is used to clamp the stainless steel pipe to be corrected. The clamping assembly 110 can adopt a pressure block type, a claw type, a V-shaped support block type, or a combination clamping structure, enabling the rapid clamping of stainless steel pipes with different outer diameters and ensuring that the pipe axis corresponds with the boring bar assembly 300, improving machining coaxiality.

[0028] Combination Figures 2 to 4As shown, the correction drive assembly 200 includes a fixed base 210, a first rotating wheel 220, a second rotating wheel 230, and a support frame 240. The fixed base 210 serves as the main housing fixed to the surface of the support frame 100, and its interior forms an installation cavity. The first rotating wheel 220 and the second rotating wheel 230 are spaced vertically apart and are rotatably mounted inside the fixed base 210. Both the first rotating wheel 220 and the second rotating wheel 230 have beveled tooth rings 223 on their opposing surfaces. The support frame 240 is located between the two, and the support frame 240 has an overall annular structure with several evenly spaced hobbing teeth 241 on its outer circumference. Each hobbing tooth 241 can rotate freely and meshes with the corresponding beveled tooth ring 223 on its upper and lower sides, respectively. Therefore, when the two rotating wheels rotate, the support frame 240 provides stable support, ensuring smooth operation of the first rotating wheel 220 and the second rotating wheel 230, reducing sway and load concentration.

[0029] In this embodiment, a first drive motor 211 and a second drive motor 212 are mounted on one side of the fixed base 210, and two sets of transmission gear sets 213 are provided on the inner side of the fixed base 210. The two sets of transmission gear sets 213 are respectively used for power transmission between the first drive motor 211 and the first rotating wheel 220, and between the second drive motor 212 and the second rotating wheel 230. The first drive motor 211 and the second drive motor 212 preferably adopt a geared motor structure to improve the low-speed output torque and speed control accuracy. Through the independent drive mode of the dual motors, the direction and speed of the first rotating wheel 220 and the second rotating wheel 230 can be controlled separately, providing a basis for subsequent lifting and compound rotary motion.

[0030] Combination Figures 4 to 6 As shown, the first rotating wheel 220 has an outer ring tooth 222 on its outer side, and the second rotating wheel 230 also has an outer ring tooth 222 on its outer side, which mesh with the corresponding transmission gear set 213 respectively. A threaded sleeve 221 is fixedly installed at the center of the first rotating wheel 220, and the inner side of the threaded sleeve 221 has an internal thread structure that matches the external thread 312 of the shaft 310. A sliding sleeve 231 is fixedly installed at the center of the second rotating wheel 230, and the inner side of the sliding sleeve 231 has a sliding key structure. Through the upper and lower cooperation of the threaded sleeve 221 and the sliding sleeve 231, the shaft 310 can be stably guided and can generate axial displacement in the rotation state.

[0031] Combination Figure 2 and Figure 7As shown, the boring bar assembly 300 includes a shaft 310 and an expansion taper 320 fixed to the bottom end of the shaft 310. The shaft 310 is a long rod structure with a thread 312 on its outer side and a groove 311 axially formed on its surface. The shaft 310 is slidably sleeved on the inner side of the threaded sleeve 221 and the sliding sleeve 231, wherein the groove 311 and the sliding key on the inner side of the sliding sleeve 231 cooperate with each other to limit relative circumferential slippage between the shaft 310 and the sliding sleeve 231, while allowing axial sliding. After the thread 312 engages with the threaded sleeve 221, the rotational difference can be converted into lifting displacement.

[0032] In this embodiment, the expansion cone 320 is fixed to the bottom end of the shaft 310. The expansion cone 320 has a frustum-shaped structure with a tapered front end and an expanded rear end, and its outer circumference gradually tapers from the large diameter end to the small diameter end. This structure facilitates the insertion of the expansion cone 320 into the inner hole of the stainless steel pipe and allows it to gradually contact the inner wall of the pipe during the insertion process, avoiding instantaneous impact. The surface of the expansion cone 320 is provided with spiral patterns 321, which extend spirally from the large diameter end to the small diameter end. When the expansion cone 320 rotates into the inner hole of the pipe, the spiral patterns 321 can generate a guiding and traction effect and form continuous trimming contact with the inner wall, improving processing stability and surface consistency.

[0033] In this embodiment, when the first drive motor 211 and the second drive motor 212 rotate synchronously in the same direction, the first rotating wheel 220, the second rotating wheel 230, the support frame 240, and the boring bar assembly 300 rotate synchronously. Since the two rotating wheels rotate at the same speed, the shaft 310 does not produce any axial displacement relative to the threaded sleeve 221. At this time, the expansion cone 320 mainly relies on the spiral groove 321 to achieve screw-in and introduction, which is suitable for rapid entry into the tube, positioning, and light load dressing stages.

[0034] In this embodiment, when the first drive motor 211 and the second drive motor 212 rotate synchronously in opposite directions or have a speed difference, relative motion is formed between the first rotating wheel 220 and the second rotating wheel 230. Because the shaft 310 is limited by the sliding groove 311 and the sliding sleeve 231, the shaft 310 rotates and is guided by the second rotating wheel 230. Simultaneously, under the action of the threaded sleeve 221 and the thread 312, axial lifting displacement is generated, thereby realizing a composite motion of the boring bar assembly 300 rotating while feeding or rotating while retracting. By controlling the speed ratio of the two motors, the relationship between the axial feed speed and the rotational speed can be adjusted to adapt to stainless steel pipes with different wall thicknesses, hardnesses, and machining allowances.

[0035] The processing technology of the present invention can be implemented as follows: First, the stainless steel pipe to be processed is installed on the clamping assembly 110 and clamped and positioned so that the inner hole of the steel pipe is coaxial with the boring rod assembly 300; then, the first drive motor 211 and the second drive motor 212 are started so that the expansion cone 320 enters the inner hole of the steel pipe; then, the direction of rotation and speed ratio of the two motors are adjusted according to the processing requirements so that the boring rod assembly 300 performs rotational dressing and axial feed actions to correct the inner hole of the steel pipe segment by segment; during the processing, the feed, retraction and dressing can be repeated until the inner hole size and surface condition meet the set requirements; finally, the drive is stopped, the boring rod assembly 300 is controlled to exit the steel pipe, and the processed workpiece is removed.

[0036] In a preferred example, the expansion taper 320 with different outer diameters can be replaced according to the specifications of the stainless steel pipe, and the thread pitch and taper angle parameters of the thread 321 can be adjusted to suit the processing requirements of thin-walled pipes, medium-thick-walled pipes, or high-strength steel pipes. An auxiliary positioning block can also be added to the clamping assembly 110, and a lubrication structure or protective cover can be added to the fixed base 210 to further improve the service life of the equipment and processing stability.

[0037] In this embodiment, by setting up a steel pipe inner diameter correction processing structure, the existing inner hole of the stock stainless steel pipe can be expanded and corrected a second time. While keeping the outer diameter specification basically unchanged, the inner hole size is readjusted, so that the stock steel pipe with originally limited specifications can be reused, thereby improving the reuse rate of stock materials.

[0038] In this embodiment, by setting up a dual-power coordinated transmission structure of a first drive motor, a second drive motor, a first rotating wheel, and a second rotating wheel, the rotational motion and axial feed motion of the boring rod group can be controlled separately. This allows the device to complete the processing actions such as introduction, correction, and withdrawal within the same mechanism, reducing the traditional multi-station switching process and improving the efficiency and continuity of stainless steel pipe inner hole finishing.

[0039] In this embodiment, by setting an expanding cone with a tapered truncated cone structure and its surface grooves, a self-guiding spiral advance can be formed when entering the inner hole of the steel pipe, and a continuous support and trimming effect can be generated on the inner wall. This not only facilitates the processing of inner holes of stainless steel pipes of different specifications, but also reduces jamming and uneven wear, and improves the stability of the device operation and the yield of finished products.

[0040] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A stainless steel pipe inner diameter correction and processing device, characterized in that, include: The frame (100), the correction drive assembly (200), and the boring rod assembly (300) are provided. The correction drive assembly (200) is fixed to the surface of the frame (100). The correction drive assembly (200) is used to drive the boring rod assembly (300) to lift and rotate. The boring rod assembly (300) includes a shaft (310) and an expansion cone (320) fixed to the bottom end of the shaft (310). The correction drive assembly (200) includes a fixed base (210), a first rotating wheel (220), a second rotating wheel (230), and a support frame (240). The first rotating wheel (220) and the second rotating wheel (230) are rotatably mounted inside the fixed base (210), and both the first rotating wheel (220) and the second rotating wheel (230) have bevel gear rings (223) on their opposing surfaces. A hobbing gear (241) that meshes with the surface of the bevel gear ring (223) is rotatably mounted on the outer side of the support frame (240). A first drive motor (211) and a second drive motor (212) are provided on one side of the fixed base (210). The first rotating wheel (220) and the second rotating wheel (230) are connected to the ... The outer side of each wheel (230) is provided with an outer ring tooth (222) and is connected to the output end of the first drive motor (211) and the second drive motor (212) respectively through the outer ring tooth (222). The inner side of the first wheel (220) and the second wheel (230) are respectively fixedly installed with a screw sleeve (221) and a sliding sleeve (231). The shaft (310) is slidably sleeved on the inner side of the screw sleeve (221) and the sliding sleeve (231). The surface of the shaft (310) is provided with a groove (311) that slides against the inner side of the sliding sleeve (231). The outer side of the shaft (310) is provided with a thread (312) that matches the inner side of the screw sleeve (221).

2. The stainless steel pipe inner diameter correction processing device according to claim 1, characterized in that, The stand (100) is detachably mounted with a clamping assembly (110) for clamping the stainless steel pipe to be corrected. The clamping assembly (110) is located directly below the correction drive assembly (200).

3. The stainless steel pipe inner diameter correction and processing device according to claim 1, characterized in that, Two sets of transmission gears (213) are rotatably mounted on the inner side of the fixed base (210), which are used for meshing transmission between the first drive motor (211) and the first rotating wheel (220) and between the second drive motor (212) and the second rotating wheel (230), respectively. The first drive motor (211) and the second drive motor (212) are both geared motor structures.

4. The stainless steel pipe inner diameter correction processing device according to claim 1, characterized in that, The support frame (240) is annular, and a number of hobbing teeth (241) are evenly distributed in the circumferential direction on the outer periphery. The upper and lower surfaces of each hobbing tooth (241) mesh with the bevel ring (223) on the top surface of the first rotating wheel (220) and the bevel ring (223) on the bottom surface of the second rotating wheel (230) respectively, for supporting the rotation of the first rotating wheel (220) and the second rotating wheel (230).

5. The stainless steel pipe inner diameter correction and processing device according to claim 3, characterized in that, The inner side of the slide sleeve (231) is provided with a sliding key structure that matches the surface of the slide groove (311). The first drive motor (211) and the second drive motor (212) rotate in opposite directions in a synchronous reverse rotation, thereby realizing the lifting and rotating of the boring rod assembly (300).

6. A stainless steel pipe inner diameter correction processing device according to any one of claims 1 to 5, characterized in that, The expansion cone (320) is conical and has spiral patterns (321) on its surface. It drives the first rotating wheel (220), the second rotating wheel (230), the support frame (240) and the boring rod group (300) to rotate synchronously in the same direction as the first driving motor (211) and the second driving motor (212), and uses the spiral patterns (321) to rotate the stainless steel pipe inside.

7. A stainless steel pipe inner diameter correction processing device according to any one of claims 1 to 5, characterized in that, The expansion cone (320) has a truncated cone structure with a tapered front end and an expanded rear end. Its outer circumference is gradually tapered from the large diameter end to the small diameter end, so as to facilitate its insertion into the inner hole of the stainless steel pipe and generate a radial correction effect during the screwing process.

8. The stainless steel pipe inner diameter correction processing device according to claim 7, characterized in that, The spiral pattern (321) extends spirally from the large diameter end of the expansion cone (320) to the small diameter end, which is used to improve the spiral guiding ability and the stability of the inner wall finishing.

9. A machining process for correcting the inner diameter of a stainless steel pipe, characterized in that: The stainless steel pipe inner diameter correction processing device includes any one of claims 1 to 8.

10. The stainless steel pipe inner diameter correction processing technology according to claim 9, characterized in that, Includes the following steps: S1. Fix the stainless steel pipe to be processed on the surface of the clamping assembly (110) and make the inner hole of the pipe correspond to the boring rod assembly (300); S2. Start the first drive motor (211) and the second drive motor (212) to rotate asynchronously in opposite directions. Drive the boring rod group (300) to move axially up and down through the threaded engagement between the screw sleeve (221) and the shaft (310) to correct the inner hole of the steel pipe. S3. Adjust the speed ratio of the first drive motor (211) and the second drive motor (212) to control the motion ratio between the lifting and rotating motion of the boring rod assembly (300), and then adapt the appropriate feed and rotation ratio according to the strength of the stainless steel pipe. S4. Repeat the lifting, lowering, and rotating actions according to processing requirements until the inner hole of the steel pipe reaches the set dimensional accuracy. S5. Stop the drive and reverse the boring bar assembly (300) to remove the finished stainless steel pipe.

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