Thread damage correction device

Abstract

The utility model relates to the technical field of mechanical equipment repairing, in particular to a thread damage correcting device. The thread damage correction device comprises a calibration detection shaft, a detection mandrel and a tapping guide piece. The calibration detection shaft, the detection core shaft and the tapping guide piece respectively comprise a conical shaft section and a detection reference shaft section which are connected. The conical shaft section can be positioned and assembled in the shaft hole of the welded tube seat; and the outer edge of the detection reference shaft section is aligned with the outer edge of the tube seat. In the thread repairing process of the pipe seat, the thread damage correcting device can achieve accurate positioning and reliable repairing in the tapping process of the shaft hole and the outer edge of the pipe seat through the conical shaft section and the detection reference shaft section in the grinding and tapping stages, and can also conduct reliable grinding and repairing on the taper of the shaft hole of the pipe seat through the conical shaft section. Therefore, the thread damage correcting device can effectively improve the correcting efficiency of the thread damage of the tube socket, the tube socket does not need to be cut off and reassembled in the thread repairing process, the thread repairing process is simplified, and the repairing operation precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment repair, in particular to a thread damage correction device. Background Art

[0002] In the process of mechanical equipment production and maintenance repair, some structural components, as important load-bearing structures of the equipment, usually involve component disassembly, cutting and re-welding assembly of component thread mounting seats, pressure holding, and various process flows. For the thread damage repair process on structural components, in order to ensure that the repaired equipment still maintains assembly accuracy and can be successfully put into operation, usually all the processes involved in the above-mentioned assembly and repair process need to comply with specifications and high-precision operation processes. Otherwise, it is easy to cause problems such as thread extrusion due to impurities in the internal thread of the structural component, resulting in frequent disassembly and assembly of pipeline threads, leading to thread damage and affecting the resumption of work of the equipment.

[0003] In the original repair operation process, after the thread is damaged, it is usually necessary to cut the root of the thread, and then carry out a number of process flows such as subsequent re-welding of components, re-detection, pressure holding, and process flow. During the operation of these process flows, it is very difficult for the damaged repaired thread components to maintain precise positioning, especially it is difficult to ensure the accurate alignment of the axis of the repaired thread components, which seriously affects the restoration of the performance of the repaired thread to the original level. Summary of the Utility Model

[0004] The utility model provides a thread damage correction device to solve the defect that in the prior art, it is very difficult for the damaged repaired thread components to maintain precise positioning, especially it is difficult to ensure the accurate alignment of the axis of the repaired thread components, which seriously affects the restoration of the performance of the repaired thread to the original level. Thus, in the thread repair process flow, the accurate alignment of the thread components can be realized, the thread repair accuracy can be improved, and the performance of the repaired thread components can be restored to the original state.

[0005] The utility model provides a thread damage correction device, including a calibration detection shaft, a detection core shaft, and a tapping guide. The calibration detection shaft, the detection core shaft, and the tapping guide all include a connected conical shaft section and a detection reference shaft section. The conical shaft section can be positioned and assembled in the shaft hole of the welded pipe seat; the outer edge of the detection reference shaft section is aligned with the outer edge of the pipe seat.

[0006] According to a thread damage correction device of the utility model, the calibration detection shaft includes a connected first conical shaft section and a grinding calibration shaft section. The first conical shaft section can be struck and inserted into the shaft hole of the welded pipe seat, and the outer edge of the grinding calibration shaft section is aligned with the outer edge of the main body of the pipe seat.

[0007] A thread damage correction device according to the present utility model, wherein the detection mandrel includes a connected second tapered shaft section and a knife-edge detection shaft section. The second tapered shaft section can be rotatably inserted into the shaft hole of the polished socket, and the outer edge of the knife-edge detection shaft section is aligned with and connected to the outer edge of the main body of the socket.

[0008] A thread damage correction device according to the present utility model, wherein the detection mandrel further includes a shoulder. The second tapered shaft section is connected to the knife-edge detection shaft section through the shoulder. In the state where the second tapered shaft section is inserted into the shaft hole of the socket, the knife-edge detection shaft section abuts against and is connected to the end face of the main body of the socket through the shoulder.

[0009] A thread damage correction device according to the present utility model, wherein the detection mandrel further includes a journal. The shoulder is connected to the knife-edge detection shaft section through the journal, and a part of the knife-edge detection shaft section close to the journal is in interference fit with the shaft hole of the socket.

[0010] A thread damage correction device according to the present utility model, wherein the detection mandrel further includes a clamping portion. The clamping portion and the second tapered shaft section are respectively connected to both ends of the knife-edge detection shaft section, and the clamping portion, the knife-edge detection shaft section and the second tapered shaft section are coaxially arranged.

[0011] A thread damage correction device according to the present utility model further includes a die head assembly. The die head assembly is sleeved on the outer edge of the detection reference shaft section of the tapping guide member and can rotate and feed from the detection reference shaft section to the main body of the socket, so that the outer edge of the main body of the socket is formed into an external thread.

[0012] A thread damage correction device according to the present utility model, wherein the tapping guide member includes a connected guide shaft section and a taper transition shaft section. The outer edge of the guide shaft section is provided with a guide thread. The taper transition shaft section can be inserted into the shaft hole of the socket after dressing, and the outer edge of the guide shaft section is aligned with the outer edge of the main body of the socket. The die head assembly is assembled on the guide shaft section and can rotate and feed along the guide thread to the main body of the socket.

[0013] A thread damage correction device according to the present utility model, wherein the tapping guide member further includes a smooth shaft section. The smooth shaft section and the taper transition shaft section are respectively connected to both ends of the guide shaft section, and the smooth shaft section, the guide shaft section and the taper transition shaft section are coaxially arranged.

[0014] According to a thread damage correction device of the utility model, the die assembly includes a die body, a threaded tapping portion and a plurality of chip removal holes, the threaded tapping portion is threadedly constructed on the inner wall of the axial hole of the die body, the chip removal holes are penetrated through the die body, and the chip removal holes are connected to the axial hole of the die body.

[0015] The thread damage correction device provided by the utility model includes a calibration detection shaft, a detection mandrel and a tapping guide. The calibration detection shaft, the detection mandrel and the tapping guide all include a connected tapered shaft segment and a detection reference shaft segment. The tapered shaft segment can be positioned and assembled in the axial hole of the pipe seat after welding; the outer edge of the detection reference shaft segment is aligned with the outer edge of the pipe seat. In the thread repair process of the pipe seat, the thread damage correction device can not only use the tapered shaft segment and the detection reference shaft segment to realize the tapping process of the axial hole and the outer edge of the pipe seat in the grinding and tapping stages, but also use the tapered shaft segment to reliably repair the taper of the axial hole of the pipe seat. It can be seen that the thread damage correction device can effectively improve the correction efficiency of the pipe seat thread damage, and there is no need to cut and reinstall the pipe seat during the thread repair process, simplifying and optimizing the thread repair process, and improving the accuracy of the repair operation. The repaired pipe seat can fully retain the original performance, and ensure the subsequent use accuracy of the pipe seat, and can effectively ensure that the axis alignment is excellent after the pipe seat is assembled into the pipeline.

[0016] In summary, the thread damage correction device provided by the utility model can make the thread repair process unnecessary for cutting and reinstalling the structural parts for welding and subsequent cumbersome operation procedures, simplify and optimize the thread repair process of the threaded pipe seat, and thus greatly shorten the repair cycle of the overall structural parts, and realize efficient, accurate and rapid repair of the thread damage of the structural parts. In addition, the use of the thread damage correction device will not cause impact to the original structural parts during the thread repair operation, and the original structure of the original structural parts is well protected. It can also ensure that the thread axis of the pipe seat coincides with the axis of the tapered channel of the internal shaft hole, ensuring the close overlap of the outer cone plug of the pipeline and the inner cone plug of the frame during the subsequent assembly process, and will not cause air leakage in the pipeline. In addition, the thread damage correction device can also reduce the cost loss caused by the cumbersome multi-process operation in the original thread repair operation, and has certain economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1It is a schematic structural diagram of the first usage state of the thread damage correction device of the present utility model.

[0019] Figure 2 It is a schematic structural diagram of the second usage state of the thread damage correction device of the present utility model.

[0020] Figure 3 Is Figure 2 The left view of the thread damage correction device shown.

[0021] Figure 4 It is a schematic structural diagram of the third usage state of the thread damage correction device of the present utility model.

[0022] Figure 5 Is Figure 4 The left view of the thread damage correction device shown.

[0023] Reference numerals:

[0024] 1. Calibration and detection shaft; 11. First conical shaft section; 12. Grinding and calibration shaft section; 2. Pipe seat; 21. Main pipe body; 22. Outer edge; 23. Shaft hole; 24. External thread; 3. Chamber wall; 4. Tapping guide; 41. Optical shaft section; 42. Guide shaft section; 43. Guide thread; 44. Taper transition shaft section; 5. Die head assembly; 51. Die head body; 52. Chip removal hole; 53. Thread tapping part; 6. Detection mandrel; 61. Second conical shaft section; 62. Edge detection shaft section; 63. Clamping part; 64. Shaft shoulder; 65. Shaft neck; 7. Pulling hole. Detailed implementation manners

[0025] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions in the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without making creative efforts fall within the scope of protection of the present utility model.

[0026] Combined with Figures 1 to 5 As shown, in the embodiments of the present utility model, taking the bogie frame of a rail vehicle as an example, the structure and usage method of the thread damage correction device are described in detail.

[0027] Since the bogie is the load-bearing structure for vehicle operation and the front frame has been formed before the assembly process, it is necessary to weld the mounting seats for various pipelines and components of the bogie before the assembly operation, and the structural characteristics of the frame after welding tend to be in a stable state. For example, the pipe seat 2 described in this embodiment is welded to the cavity wall 3 of the frame air chamber, and the shaft hole 23 of the pipe seat 2 is coaxially connected to the through hole on the cavity wall 3. Specifically, the normal pipe seat 2 includes a main pipe body 21, and the main pipe body 21 is welded to the cavity wall 3 of the frame air chamber. An external thread 24 is formed on the outer edge 22 of the main pipe body 21, a shaft hole 23 is formed inside the main pipe body 21, one end of the shaft hole 23 is coaxially connected to the through hole on the cavity wall 3, and a tapered groove is formed at the other end of the shaft hole 23. The external thread 24 is used to connect the self - contained nut of the pipeline; the groove is tapered - mated with the front end of the pipeline to ensure its sealing performance and prevent leakage; the shaft hole 23 is connected to the through hole and is used to connect to the additional air chamber of the frame to realize the transfer of wind pressure. Before the overall assembly and connection of the pipeline, the pipeline is tightly connected by using its own external taper plug and self - contained nut. Because, in order to ensure a reliable sealed connection between the pipe seat 2 and the pipeline during use and realize the reliable transfer of wind pressure, the reliability of the assembly between the external thread 24 of the pipe seat 2 and the pipeline is particularly important. Therefore, in the case of thread damage to the pipe seat 2 on the frame, how to reliably repair the thread of the pipe seat 2 is one of the very important processes in the repair work of the frame wind pressure components.

[0028] In the original repair operation process, after the thread is damaged, it is usually necessary to cut the thread root of the pipe seat 2, weld a new pipeline thread mounting seat on the frame again, and at the same time, it is necessary to re - perform flaw detection, pressure - holding and other process flows on the newly installed mounting seat. The long operation process not only leads to the problem of cumbersome process cycles but also affects the normal flow of products. Moreover, when welding, cutting and grinding the original root, it is easy to cause impact on the base material, reducing the service life of the frame.

[0029] Such as Figures 1 to 5As shown in the figure, the embodiment of the present utility model provides a set of thread damage correction device. The thread damage correction device includes a calibration detection shaft 1, a detection core shaft 6 and a tapping guide 4. The calibration detection shaft 1, the detection core shaft 6 and the tapping guide 4 all include a connected conical shaft section and a detection reference shaft section. The conical shaft section can be positioned and assembled in the shaft hole 23 of the pipe seat 2 after welding repair; the outer edge of the detection reference shaft section is aligned with the outer edge of the pipe seat 2. In this embodiment, the outer edge of the pipe seat 2 includes at least one of the outer edge 22 of the main body 21 of the pipe seat in the grinding stage and the shaft hole reaming stage, and the major diameter (i.e., the nominal diameter of the external thread 24) of the external thread 24 in the tapping stage. During the thread repair process of the pipe seat 2, the thread damage correction device can not only use the conical shaft section and the detection reference shaft section to achieve precise positioning and reliable repair of the tapping process of the shaft hole 23 and the outer edge 22 of the pipe seat 2 in the grinding stage and the tapping stage, but also reliably ream the taper of the shaft hole 23 of the pipe seat 2 by using the conical shaft section. It can be seen that the thread damage correction device can effectively improve the correction efficiency of the thread damage of the pipe seat 2, and there is no need to cut and reinstall the pipe seat 2 during the thread repair process, which simplifies and optimizes the thread repair process, improves the repair operation accuracy, and the repaired pipe seat 2 can completely retain its original use performance, and ensures the subsequent use accuracy of the pipe seat, and can effectively ensure the excellent alignment of the axis after the pipe seat is assembled with the pipeline.

[0030] In summary, the thread damage correction device of this embodiment can make the thread repair operation process without the need for cutting, reinstalling, welding of structural parts and subsequent cumbersome operation processes, simplifies and optimizes the thread repair process of the threaded pipe seat 2, and then greatly shortens the repair cycle of the overall structural parts, realizing efficient, precise and rapid repair treatment of the thread damage of the structural parts. Moreover, using this thread damage correction device will not cause impact on the original structural parts during the thread repair operation process, plays a good protection for the original structure of the original structural parts, and extends the service life of the original structural parts; it can also ensure that the axis of the major diameter of the external thread 24 of the pipe seat 2 coincides with the axis of the conical hole of the internal shaft hole 23 of the pipe seat 2, ensuring the close fit and coincidence of the external taper plug of the pipeline and the internal taper plug of the frame during the subsequent assembly process, and will not cause air leakage of the pipeline. In addition, this thread damage correction device can also reduce the cost loss caused by the cumbersome multi-process operation in the original thread repair operation, and has certain economic benefits.

[0031] It should be noted that in this embodiment, the pipe seat 2 with damaged threads before repair includes a main body 21, a shaft hole 23 and an outer edge 22. The main body 21 is of a stepped structure as a whole. The end with a smaller outer diameter of the main body 21 is welded to the cavity wall 3 of the frame air chamber. The shaft hole 23 penetrates the axis of the main body 21 and communicates with the through hole on the cavity wall 3. The repaired pipe seat 2 has the same structure as the above-mentioned normal state pipe seat 2.

[0032] It should be noted that in the thread damage correction device described in this embodiment, the calibration detection shaft 1 is used in the grinding stage of the pipe seat 2, the detection mandrel 6 is used in the reaming stage of the shaft hole of the pipe seat 2, and the tapping guide 4 is used in the tapping stage of the pipe seat 2.

[0033] In some embodiments, as Figure 1 shown, the calibration detection shaft 1 includes a connected first tapered shaft section 11 and a grinding calibration shaft section 12. Among them, the first tapered shaft section 11 is the tapered shaft section of the calibration detection shaft 1, and the grinding calibration shaft section 12 is the detection reference shaft section of the calibration detection shaft 1. The first tapered shaft section 11 can be struck and inserted into the shaft hole 23 of the pipe seat 2 after welding repair, and the outer edge of the grinding calibration shaft section 12 is aligned with the outer edge 22 of the main body 21 of the pipe seat 2. In the grinding stage of the pipe seat 2, in order to ensure that the coaxiality between the circumferential center of the major diameter of the external thread 24 of the repaired pipe seat 2 and the center of the shaft hole 23 of the pipe seat 2, as well as the dimensional accuracy of the major diameter of the external thread 24 of the pipe seat 2, can meet the requirements of the pipe seat 2 in its original normal state before the thread is damaged, it is necessary to provide a reference benchmark for measurement starting from the grinding stage. Therefore, the calibration detection shaft 1 of this thread damage correction device can use the first tapered shaft section 11 as the positioning benchmark and the outer edge of the grinding calibration shaft section 12 as the grinding reference benchmark for the outer edge 22 of the main body 21 of the pipe seat 2, thereby greatly improving the accuracy of grinding and repairing the outer edge 22 of the pipe seat 2 and reducing or even avoiding the accuracy error generated by re-tapping the external thread 24 in the subsequent operation process.

[0034] In some embodiments, as Figure 2 and Figure 3 shown, the detection mandrel 6 includes a connected second tapered shaft section 61 and a blade detection shaft section 62. The second tapered shaft section 61 is the tapered shaft section of the detection mandrel 6, and the blade detection shaft section 62 is the detection reference shaft section of the detection mandrel 6. The second tapered shaft section 61 can be rotated and inserted into the shaft hole 23 of the ground pipe seat 2. On the one hand, the second tapered shaft section 61 can be inserted into the shaft hole 23 of the ground pipe seat 2 to achieve accurate positioning of the detection mandrel 6 and the shaft hole 23 of the pipe seat 2. On the other hand, the second tapered shaft section 61 can be rotated in the shaft hole 23 of the pipe seat 2, so that the coloring layer (red lead powder is used for coloring in this embodiment, and other coloring materials can be used) coated on the outer surface of the second tapered shaft section 61 can be evenly smeared in the shaft hole 23 of the pipe seat 2, so that the position of the taper high point in the shaft hole 23 can be clearly shown, so that the high point can be accurately removed by using a grinding wheel or a scraper, and then the taper of the shaft hole 23 of the pipe seat 2 can be restored to a qualified state through repeated grinding. The outer edge of the blade detection shaft section 62 is aligned and connected with the outer edge of the main body 21 of the pipe seat 2, so as to ensure that the outer edge 22 of the pipe seat 2 and the outer edge of the detection mandrel 6 are on the same straight line parallel to the axis, and ensure that the axis of the shaft hole 23 of the pipe seat 2 is coaxial with the outer edge 22 during the reaming process of the shaft hole 23, meeting the coaxiality requirements.

[0035] In some specific embodiments, such as Figure 2 and Figure 3 shown, the detection mandrel 6 further includes a shoulder 64. The second tapered shaft section 61 is connected to the edge detection shaft section 62 through the shoulder 64. In this embodiment, the shoulder 64 is completely matched with the groove position of the tube socket 2, so that when the second tapered shaft section 61 is inserted into the shaft hole 23 of the tube socket 2, the edge detection shaft section 62 abuts against and is connected to the end face of the main body 21 of the tube socket 2 through the shoulder 64. This structure can ensure that the second tapered shaft section 61 of the detection mandrel 6 can be completely inserted into the shaft hole 23 of the tube socket 2. Thus, during the rotation of the detection mandrel 6, the second tapered shaft section 61 can be inserted into the deepest part of the shaft hole 23 of the tube socket 2 to the greatest extent, and it is ensured that the edge detection shaft section 62 and the main body 21 of the tube socket 2 are connected through the end face, so that the grinding degree of the shaft hole 23 is more complete and accurate.

[0036] In some specific embodiments, such as Figure 2 shown, the detection mandrel 6 further includes a journal 65. The shoulder 64 is connected to the edge detection shaft section 62 through the journal 65. The journal 65 can be used as a process relief edge to facilitate the machining of the edge detection shaft section 62, and can also facilitate the accurate positioning of the tapered shaft section and the shaft hole 23 and improve the assembly concentricity.

[0037] To further improve the accuracy of positioning and the assembly reliability between the tapered shaft section and the shaft hole 23, it is preferred that the part of the edge detection shaft section 62 close to the journal 65 is in interference fit with the shaft hole 23 of the tube socket 2. During the thread repair process, as Figure 2 shown, the end dimension of the edge detection shaft section 62 close to the journal 65 is 0.06 mm to 0.11 mm larger than the inner diameter dimension of the shaft hole 23 of the tube socket 2, so that there is an interference fit surface between the part of the edge detection shaft section 62 close to the journal 65 after assembly and the shaft hole 23. The shaft section length of this interference fit surface is Figure 2 the L shaft section shown, that is, the distance between the part of the edge detection shaft section 62 close to the journal 65 and the mid-diameter position of the edge detection shaft section 62. The shaft section length of this interference fit surface is about 6 mm, which not only eliminates the gap but also ensures the concentricity.

[0038] In some specific embodiments, such as Figure 2 shown, the detection mandrel 6 further includes a clamping portion 63. The clamping portion 63 and the second tapered shaft section 61 are respectively connected to both ends of the edge detection shaft section 62, and the clamping portion 63, the edge detection shaft section 62 and the second tapered shaft section 61 are coaxially arranged. The clamping portion 63 can facilitate the fixing of the detection mandrel 6 and ensure that the detection mandrel 6 in rotation has very precise concentricity in each shaft section, so as to improve the accuracy and efficiency of the taper grinding of the shaft hole 23 of the tube socket 2.

[0039] In some embodiments, such asFigure 4 and Figure 5 As shown in Figure 5 , the thread damage correction device described in this embodiment further includes a die head assembly 5. The die head assembly 5 is sleeved on the outer edge of the detection reference shaft section of the tapping guide 4, and can rotate and feed from the detection reference shaft section of the tapping guide 4 to the main body 21 of the pipe socket 2, so as to form an external thread 24 on the outer edge 22 of the main body 21 of the pipe socket 2 by using the die head assembly 5.

[0040] In some specific embodiments, as Figure 4 As shown in Figure 4 , the tapping guide 4 includes a connected guide shaft section 42 and a taper transition shaft section 44. The outer edge of the guide shaft section 42 is provided with a guide thread 43. The taper transition shaft section 44 can be inserted into the shaft hole 23 of the pipe socket 2 after grinding, and the outer edge of the guide shaft section 42 is aligned with the outer edge 22 of the main body 21 of the pipe socket 2. The die head assembly is assembled on the guide shaft section 42 and can rotate and feed along the guide thread 43 to the main body 21 of the pipe socket 2, so as to form an external thread 24 on the outer edge 22 of the main body 21 of the pipe socket 2 by threading (tapping). Under the guiding action of the guide thread 43 of the guide shaft section 42, the outer edge 22 of the main body 21 of the pipe socket 2 can be formed into an external thread 24 with the required size according to actual needs. That is, the major diameter dimension of the guide thread 43 of the guide shaft section 42 is consistent with the dimensional accuracy of the external thread 24 of the pipe socket 2 after predetermined repair. Through the accurate positioning and precise grinding of the shaft hole 23 and the outer edge 22 of the pipe socket 2 in the aforementioned grinding stage and the shaft hole grinding stage, an external thread 24 with the required size can be quickly formed by using the guide thread 43 in the tapping stage, improving the operation efficiency of thread threading and reducing the operation difficulty. It can also improve the dimensional accuracy of the repaired thread, achieving the purpose of perfectly restoring the service performance of the pipe socket 2.

[0041] In some specific embodiments, as Figure 4 As shown in Figure 4 , the tapping guide 4 further includes a smooth shaft section 41. The smooth shaft section 41 and the taper transition shaft section 44 are respectively connected to both ends of the guide shaft section 42, and the smooth shaft section 41, the guide shaft section 42 and the taper transition shaft section 44 are coaxially arranged. The smooth shaft section 41 can facilitate the fixation of the tapping guide 4 and can also form a stop effect on the rotation of the die head assembly 5 at the end of the guide thread 43, improving the use safety of the whole set of devices. Moreover, this setting can also ensure the accurate feeding of the die head assembly 5, that is, ensuring that the smooth shaft section 41, the guide shaft section 42 and the taper transition shaft section 44 reach a very precise coaxiality, so as to improve the tapping accuracy and efficiency of the external thread 24 of the pipe socket 2.

[0042] In some specific embodiments, as Figure 5As shown, the die assembly 5 includes a die body 51, a threaded tapping portion 53 and a plurality of chip removal holes 52. The threaded tapping portion 53 is threadedly constructed on the inner wall of the axial hole of the die body 51, and can serve as a cutting edge for the outer edge 22 of the tube seat 2. The chip removal hole 52 is set through the die body 51, and the chip removal hole 52 is connected to the axial hole of the die body 51. The setting of the chip removal hole 52 can ensure that the cutting debris can be discharged smoothly during the tapping process without obstructing the cutting edge.

[0043] In some specific embodiments, in order to ensure the accuracy of the tapping process, balanced tapping force and simple operation, it is preferred that at least four chip removal holes 52 are provided on the above-mentioned die body 51 along the thickness direction, and each chip removal hole 52 is evenly arranged around the axial hole of the die body 51, and a threaded tapping blade structure is respectively constructed on the inner wall of the axial hole of the die body 51 between adjacent chip removal holes 52, so that the inner wall of the axial hole of the entire die body 51 forms the above-mentioned controlled thread tapping part 53, which can facilitate and smoothly realize the tapping operation and improve the tapping accuracy.

[0044] It should be noted that in common die assemblies, the chip removal holes 52 are arranged along the thickness direction of the die body 51. However, the chip removal holes 52 may also be constructed radially on the side wall of the die body 51, as long as the debris generated during the tapping process can be smoothly discharged through the chip removal holes, thereby improving the tapping efficiency and safety of the die assembly 5 as much as possible without affecting the tapping accuracy of the die assembly 5.

[0045] It should be noted that the die assembly 5 described in this embodiment is a standard round die, and any one of a die wrench, a square die (square die), a hexagonal die (hexagonal die), a tubular die and a pipe die may also be used.

[0046] It should be noted that the tapered shaft segment described in this embodiment is provided with a preset taper ɸ, and the taper range of the preset taper ɸ is 0.8 degrees to 1 degree.

[0047] It should be noted that the end surface of the detection reference shaft section facing away from the tapered shaft section in this embodiment is configured with a drawing hole 7. The drawing hole 7 is arranged along the axial direction of the detection reference shaft section, and preferably the drawing hole 7 is a threaded blind hole, so that the corresponding thread damage correction device can be more conveniently pulled out of the shaft hole 23 of the pipe seat 2 by using a threaded connection drawing tool.

[0048] The following is a detailed description of the method of using the thread damage repair device provided by the present invention. The method of using the thread damage repair device described below can be referenced to the thread damage repair device described above.

[0049] The method of using the thread damage repair device described in this embodiment mainly includes a pre-processing stage, a grinding stage, a shaft hole repair stage and a tapping stage. The details are as follows.

[0050] The pre - treatment stage includes two steps: removing the damaged part and welding and repairing the socket 2.

[0051] The step of removing the damaged part means grinding the damaged external thread 24 on the outer edge 22 of the main body 21 of the socket 2 until the bottom diameter size of the external thread 24 of the socket 2 is reached, so as to completely remove the damaged thread structure.

[0052] The step of welding and repairing the socket 2 means welding the circumferential part of the outer edge 22 of the socket 2 after grinding, ensuring that the welding height exceeds the crest line of the external thread 24 (that is, the welding height is controlled within more than 2 mm to 3 mm greater than the thread outer diameter), and paying attention to the uniform welding amount around the hole during welding.

[0053] The grinding stage means grinding and repairing the major diameter size of the external thread 24 of the socket 2, that is, as Figure 2 shown, grinding and repairing the circumferential part of the outer edge 22 of the socket 2. The grinding stage specifically includes the following three sub - steps.

[0054] Grinding sub - step one: To ensure the coaxiality between the center of the major diameter circumference of the external thread 24 of the socket 2 after repair and the center of the shaft hole 23 of the socket 2, and at the same time ensure the dimensional accuracy of the major diameter of the external thread 24 of the socket 2, a reference datum needs to be provided for measurement during grinding. Therefore, the calibration and detection shaft 1 in the thread damage correction device described in this embodiment is selected. The rear end of the calibration and detection shaft 1 is a cylindrical grinding calibration shaft section 12, and the diameter of the grinding calibration shaft section 12 is the major diameter size of the external thread 24 of the socket 2 expected to be obtained after repair. The front end of the calibration and detection shaft 1 is provided with a first tapered shaft section 11 with a preset taper, which is similar to the structural setting of the above - mentioned detection core shaft 6. The size of the larger end of the first tapered shaft section 11 is 0.06 mm to 0.11 mm larger than the actual size of the shaft hole 23 of the socket 2, preferably with a difference of 0.1 mm between the two, so that there is an interference fit surface of at least 6 mm between the part of the first tapered shaft section 11 of the calibration and detection shaft 1 close to the grinding calibration shaft section 12 and the shaft hole 23 of the socket 2, thus ensuring that there is no clearance between the calibration and detection shaft 1 and the shaft hole 23 and ensuring the centering.

[0055] Grinding sub - step two: Coarsely grind the outer edge 22 of the socket 2 after welding and repair with a bullet - shaped grinding wheel, and use a vernier caliper to measure the size of the outer edge 22 of the socket 2. During grinding, measure the size of the outer edge 22 of the socket 2 and the wall thickness size of the socket 2 respectively to ensure the dimensional tolerance and coaxiality between the outer edge 22 of the socket 2 after coarse grinding and the shaft hole 23. The size of the outer edge 22 of the socket 2 after coarse grinding is greater than or equal to the outer edge size of the grinding calibration shaft section 12 of the calibration and detection shaft 1.

[0056] Grinding sub-step three: When the size of the outer edge 22 of the socket 2 is close to the major diameter of the external thread 24 by about 0.5 mm, the first tapered shaft section 11 of the calibration and inspection shaft 1 is driven into the shaft hole 23 of the socket 2 with a relatively small force. Specifically, the first tapered shaft section 11 with a preset taper range of 0.8 degrees to 1 degree at the front end of the calibration and inspection shaft 1 can be used to impact and roll the front end of the shaft hole 23, so that an interference fit surface of at least 6 mm is formed between the first tapered shaft section 11 and the shaft hole 23, and the surface finish of the inner surface of the shaft hole 23 is improved from Rc12.5 to above Rc1.6, forming a good fit surface and improving the centering accuracy. Then, with the grinding and calibration shaft section 12 of the calibration and inspection shaft 1 as a reference, the surface of the outer edge 22 of the socket 2 is finely ground. After each grinding, a ruler is used to clamp the grinding and calibration shaft section 12 of the calibration and inspection shaft 1 and the surface of the outer edge 22 of the socket 2, and the displayed gap situation is observed. The amount of grinding is determined according to the gap situation. The grinding is repeatedly measured until the grinding and calibration shaft section 12 of the calibration and inspection shaft 1 and the surface of the outer edge 22 of the socket 2 are on a straight line, and the gap measured by the film coating method and the knife-edge ruler is controlled between 0.01 mm and 0.002 mm.

[0057] The shaft hole reconditioning stage refers to reconditioning the shaft hole 23 of the socket 2 by using the thread damage correction device described in this embodiment, so that the shaft hole 23 of the socket 2 is configured into an internal tapered hole.

[0058] Specifically, since the shaft hole 23 of the socket 2 will be deformed after the outer edge 22 of the socket 2 is welded and repaired, it is necessary to grind and repair the shaft hole 23 of the socket 2. The detection mandrel 6 of the thread damage correction device described in this embodiment is selected, and the outer surface of the second tapered shaft section 61 of the detection mandrel 6 is coated with red lead powder as a coloring layer. Then, the second tapered shaft section 61 with a 1° taper at the front end of the detection mandrel 6 is inserted into the shaft hole 23 of the socket 2, and the whole detection mandrel 6 is rotated so that the red lead powder is evenly coated around the inner taper of the shaft hole 23 of the socket 2 to show the high point positions; then, a grinding wheel or a scraper is used to remove the high point positions where the coloring layer adheres, and the tapered shaft hole 23 of the socket 2 is repaired to a qualified state after repeated grinding. During the grinding and repair process, a knife-edge ruler is used to detect the straightness of the knife-edge detection shaft section 62 at the rear end of the detection mandrel 6. The knife-edge detection shaft section 62 is a cylindrical structure with the same diameter as the outer edge 22 of the socket 2, so that the outer circumferential surface of the outer edge 22 of the socket 2 and the knife-edge detection shaft section 62 of the detection mandrel 6 are on a straight line, and the end faces of the two are ensured to be abutted and connected through the shaft shoulder, so as to ensure that the axis of the tapered shaft hole 23 of the socket 2 after reconditioning is coaxial with the axis of the outer edge 22 of the socket 2, and the maximum coaxiality can reach no more than 0.005 mm.

[0059] The tapping stage refers to tapping the outer edge 22 of the socket 2 by using the thread damage correction device described in this embodiment to repair the external thread 24 of the socket 2.

[0060] Specifically, select the tapping assembly of the thread damage correction device described in this embodiment. The tapping assembly includes a tapping guide member 4 and a die head assembly 5. Before the tapping stage is implemented, first screw the thread tapping portion 53 of the die head assembly 5 reversely onto the guiding thread 43 of the tapping guide member 4, push against the optical axis section 41 of the tapping guide member 4 to insert the taper transition shaft section 44 into the shaft hole 23 of the polished pipe socket 2, and tighten the rear part of the optical axis section 41 of the tapping guide member 4; then screw the thread tapping portion 53 of the die head assembly 5 forward from the guiding thread 43 of the tapping guide member 4 onto the welding repair position on the outer edge 22 of the pipe socket 2 to perform thread threading on it.

[0061] It should be noted that for different types of threads, different types of die head assemblies 5 can be selected and installed.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A thread damage correction device, characterized in that: It includes a calibration and detection shaft, a detection mandrel and a tapping guide. The calibration and detection shaft, the detection mandrel and the tapping guide all include a connected tapered shaft segment and a detection reference shaft segment. The tapered shaft segment can be positioned and assembled in the shaft hole of the pipe seat after welding; the outer edge of the detection reference shaft segment is aligned with the outer edge of the pipe seat.

2. The thread damage repairing device according to claim 1, characterized in that: The calibration detection shaft includes a connected first tapered shaft section and a polished calibration shaft section, the first tapered shaft section can be struck and inserted into the shaft hole of the pipe seat after welding, and the outer edge of the polished calibration shaft section is aligned with the outer edge of the main pipe body of the pipe seat.

3. The thread damage repairing device according to claim 1, characterized in that: The detection mandrel includes a connected second tapered shaft section and a knife-edge detection shaft section, the second tapered shaft section can be rotatably inserted into the polished shaft hole of the tube seat, and the outer edge of the knife-edge detection shaft section is aligned with and connected to the outer edge of the main tube body of the tube seat.

4. The thread damage repairing device according to claim 3, characterized in that: The detection core shaft also includes a shaft shoulder, and the second conical shaft segment is connected to the knife-edge detection shaft segment through the shaft shoulder. When the second conical shaft segment is inserted into the shaft hole of the tube seat, the knife-edge detection shaft segment abuts against and is connected to the end face of the main tube of the tube seat through the shaft shoulder.

5. The thread damage repairing device according to claim 4, characterized in that: The detection mandrel also includes a journal, the shaft shoulder is connected to the knife-edge detection shaft section via the journal, and a portion of the knife-edge detection shaft section close to the journal is interference-fitted with the shaft hole of the tube seat.

6. The thread damage repairing device according to claim 3, characterized in that: The detection mandrel also includes a clamping portion, and the clamping portion and the second tapered shaft segment are respectively connected to two ends of the knife edge detection shaft segment, and the clamping portion, the knife edge detection shaft segment and the second tapered shaft segment are coaxially arranged.

7. The thread damage repairing device according to any one of claims 1 to 6, characterized in that: It also includes a die assembly, which is sleeved on the outer edge of the detection reference shaft section of the tapping guide and can be rotated and fed from the detection reference shaft section to the main body of the tube seat so that the outer edge of the main body of the tube seat is configured as an external thread.

8. The thread damage repairing device according to claim 7, characterized in that: The tapping guide includes a connected guide shaft section and a tapered transition shaft section, the outer edge of the guide shaft section is constructed with a guide thread, the tapered transition shaft section can be inserted into the axial hole of the pipe seat after grinding, and the outer edge of the guide shaft section is aligned with the outer edge of the main body of the pipe seat; the die assembly is assembled on the guide shaft section and can be rotated and fed toward the main body of the pipe seat along the guide thread.

9. The thread damage repairing device according to claim 8, characterized in that: The tapping guide also includes an optical axis segment, and the optical axis segment and the tapered transition axis segment are respectively connected to two ends of the guide axis segment, and the optical axis segment, the guide axis segment and the tapered transition axis segment are coaxially arranged.

10. The thread damage repairing device according to claim 7, characterized in that: The die assembly includes a die body, a threaded tapping portion and a plurality of chip removal holes. The threaded tapping portion is threadedly structured on the inner wall of the axial hole of the die body. The chip removal holes are arranged through the die body and are connected to the axial hole of the die body.

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