A C-ring stress corrosion specimen high-efficiency processing device and method

Abstract

The present invention provides an efficient processing device and method for a C-ring stress corrosion specimen, relating to the technical field of metal material specimen processing technology. The device comprises a C-ring fixed connecting shaft, a positioning member, and a pressing member. The positioning member and the pressing member are respectively mounted on both ends of the C-ring fixed connecting shaft. The C-ring fixed connecting shaft comprises a guide pin, a positioning outer cone, a threaded sleeve, a multi-purpose polygon, and a shaft. The guide pin is connected to the positioning outer cone, the positioning outer cone is connected to the threaded sleeve, the threaded sleeve is connected to the multi-purpose polygon, and the multi-purpose polygon is connected to the shaft. The C-ring specimen is sleeved on the C-ring fixed connecting shaft. The present invention completes the clamping and positioning of the C-ring fixed connecting shaft by providing the positioning member and the pressing member. By providing the guide pin, the positioning outer cone, the threaded sleeve, the multi-purpose polygon, and the shaft, a C-ring specimen with a thickness of less than 20 mm can be quickly fixed to the C-ring fixed connecting shaft, thereby improving the processing quality and efficiency of the C-ring specimen.

Description

Technical Field

[0001] The present invention relates to the technical field of metal material sample processing, and in particular to a device and method for efficiently processing a C-ring stress corrosion sample. Background Art

[0002] The C-ring is a common constant strain stress corrosion specimen used to determine the stress corrosion cracking sensitivity of metal materials. It is a widely used and economical specimen suitable for various product forms, including stress corrosion detection tests of weldments, pipes, rods and plates. It is one of the important specimens for evaluating the stress corrosion resistance of metals. Its processing and testing are usually based on ISO 7539-5:1989 "Corrosion stress corrosion testing of metals and alloys Part 5: Preparation and application of C-ring specimens" and GB / T 15970.5-1988 "Corrosion stress corrosion testing of metals and alloys". C-ring specimens are usually loaded with constant displacement, that is, the bolts are tightened along the center of the diameter of the ring to generate tensile stress on the outer surface of the ring. The ring can also be expanded and loaded in the opposite direction to generate tensile stress on the inner surface, such as Figure 1 As shown. Based on the shape factor of a specimen of a specific size, this type of specimen can be subjected to precise stress loading within the yield strength. The C-ring specimen is one of the smallest stress corrosion specimens. Due to its compact structure, it can be placed in any environment for testing and is low-cost. In stress corrosion testing of plates, specimens are usually prepared in the LT (the former is the length direction of the C-ring, and the latter is the crack propagation direction) or TL direction to determine the crack propagation life of the material along the rolling direction or transverse direction. However, in reality, due to differences in material pressure processing methods, the material may have significant anisotropy. It is necessary to simultaneously measure the stress corrosion resistance in the SL or ST direction (the length direction of the C-ring is perpendicular to the plate surface) to obtain comprehensive stress corrosion resistance.

[0003] According to standard drawings, C-ring specimens are generally 20mm long. Conventional C-ring specimens with their axes extending in the L or T direction of the plate typically have a certain allowance along the length of the blank to facilitate clamping during processing. Processing primarily utilizes equipment such as wire cutting, sawing machines, CNC lathes, and CNC machining centers. The general process steps can be divided into blanking, turning the outer cylindrical surface, turning the inner cylindrical surface, milling the notch, and drilling. These processes are relatively mature. Because the blank has a clamping end along its length, the effective portion of the specimen can be machined and formed in one go, effectively ensuring the surface roughness and dimensional tolerances of the entire ring. For C-ring specimens with SL or ST orientations (axis extending through the plate thickness), when the plate thickness exceeds 20mm, the specimen length is generally 20mm. When the plate thickness is less than 20mm, the specimen length can only be based on the original plate thickness. At this time, conventional processing methods are used, and there is no position for clamping in the length direction. If the clamping is reversed and clamped twice, it will cause traces of cutting. Since the direction of the principal stress of the C-type ring should be perpendicular to the surface with the lowest resistance to stress corrosion cracking, unqualified roughness or traces of cutting can easily cause uneven stress on the ring's stress surface, resulting in cracks somewhere outside the center of the ring, which will have a great impact on the test results.

[0004] Publication No. CN117600863A discloses a device and method for processing C-ring specimens. The device comprises a base, a clamping plate, and a positioning block. The positioning block is disposed on the top of the base. The clamping plate is connected to or separated from the base via the positioning block. The base is connected to or separated from a CNC machine tool. A receiving groove is formed between the clamping plate and the base. The C-ring specimen is disposed within the receiving groove. The top of the C-ring specimen is connected to the bottom of the clamping plate. The bottom and / or outer sidewall of the C-ring specimen are both connected to the base. This prior art device cannot process the outer diameter of a C-ring and can only process C-rings with a thickness greater than 20 mm. Summary of the Invention

[0005] In view of this, the present invention aims to provide a highly efficient C-ring stress corrosion specimen processing device and method to solve the problem that the prior art device cannot process the outer circle of the C-ring and can only process C-rings with a thickness greater than 20 mm.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A high-efficiency processing device for C-ring stress corrosion specimens includes a C-ring fixed connecting shaft, a positioning member, and a pressing member. The positioning member and the pressing member are respectively installed at the two ends of the C-ring fixed connecting shaft. The C-ring fixed connecting shaft includes a guide pin, a positioning outer cone, a threaded sleeve, a multi-purpose polygon, and a shaft. The guide pin is connected to the positioning outer cone, the positioning outer cone is connected to the threaded sleeve, the threaded sleeve is connected to the multi-purpose polygon, and the multi-purpose polygon is connected to the shaft. The C-ring specimen is sleeved on the C-ring fixed connecting shaft.

[0008] By setting positioning parts and pressing parts, the clamping and positioning of the C-ring fixed connecting shaft are completed. By setting guide pins, positioning outer cones, threaded sleeves, multi-purpose cubes, and shafts, C-ring specimens with a thickness of less than 20 mm can be quickly fixed on the C-ring fixed connecting shaft, thereby improving the processing quality and efficiency of the C-ring specimens.

[0009] Furthermore, the guide pin, positioning outer cone, threaded sleeve, multi-purpose cube and shaft are an integrated structure.

[0010] This arrangement improves the connection firmness between the positioning piece and the C-ring fixed connecting shaft, as well as the positioning efficiency of the C-ring fixed connecting shaft, thereby improving the quality and efficiency of C-ring specimen processing.

[0011] Furthermore, the positioning member includes a positioning spline shaft and an adapter sleeve, the positioning spline shaft cooperates with the guide pin and the positioning outer cone, and the adapter sleeve cooperates with the threaded sleeve.

[0012] The positioning spline shaft in this arrangement is used to achieve coaxial positioning of the positioning member and the C-ring fixed connecting shaft, and can also achieve common rotation of the positioning member and the C-ring fixed connecting shaft.

[0013] Furthermore, a first avoidance groove and a second avoidance groove are provided on the shaft body. The diameter of the first avoidance groove is larger than the diameter of the second avoidance groove. The first avoidance groove is close to the threaded sleeve, and the second avoidance groove extends toward an end away from the threaded sleeve and extends to the end of the shaft body.

[0014] In this setting, the first avoidance groove can avoid machining the shaft body itself when machining the outer cylindrical surface of the C ring, thereby improving machining quality and efficiency, and the second avoidance groove is conducive to machining the C ring gap.

[0015] Furthermore, a notch indicator is provided on the shaft body, and the notch indicator is located between the multi-purpose cube and the first air-avoiding groove.

[0016] The notch indicator in this setting is used to position the C-ring notch during machining, improving machining quality and efficiency.

[0017] Furthermore, the positioning spline shaft includes a cylindrical shaft body, a positioning inner cone, and a first transmission spline. The cylindrical shaft body is connected to the positioning inner cone, and the positioning inner cone is connected to the first transmission spline; the cylindrical shaft body cooperates with the guide pin, the positioning outer cone cooperates with the positioning inner cone, and the first transmission spline cooperates with the adapter sleeve.

[0018] This setting ensures the stability of the locating spline shaft connection, improves processing quality and efficiency, and also ensures the coaxiality of the locating piece and the C-ring fixed connecting shaft.

[0019] Furthermore, a second transmission spline and a first internal thread are provided in the adapter sleeve, the second transmission spline cooperates with the first transmission spline, and the first internal thread is connected to the external thread of the threaded sleeve.

[0020] This setting improves the connection stability of the adapter sleeve and the coaxiality with the positioning spline shaft, thereby improving the coaxiality of the C-ring fixed connection shaft and improving the quality and efficiency of C-ring sample processing.

[0021] Furthermore, the clamping part includes a notch reducing sleeve, a hexagonal reducing sleeve, a clamping nut, and a positioning anti-slip nut, and the notch reducing sleeve, hexagonal reducing sleeve, clamping nut, and positioning anti-slip nut are all sequentially sleeved on the C-ring fixed connecting shaft.

[0022] The notched reducing sleeve in this setting is used to fix the C-ring specimen, and the compression nut is used to fix the C-ring, the notched reducing sleeve, and the hexagonal reducing sleeve on the C-ring fixed connecting shaft, thereby improving the firmness of the C-ring specimen and improving the quality and efficiency of the C-ring specimen.

[0023] Furthermore, the hexagonal reducing sleeve includes a positioning boss, and the positioning boss is embedded in the second air-avoiding groove.

[0024] This arrangement not only facilitates the clamping of the flat-nose pliers, but also enables the hexagonal reducer to correspond to the multi-purpose hexagonal body, so that the clamping positions of the two are consistent.

[0025] A highly efficient processing method for a C-ring stress corrosion test specimen, using the processing device described above, is characterized by comprising the following steps:

[0026] S1. Obtain a C-ring specimen, which is a cylindrical structure consisting of a preset outer cylindrical surface and an inner cylindrical surface;

[0027] S2, fix the positioning piece;

[0028] S3. Assemble the C-ring by fixing the connecting shaft and the pressing piece, install the C-ring sample, mark the notch position, and process the outer cylindrical surface of the C-ring;

[0029] S4. Process the C-ring notch.

[0030] The method in this setting only requires transferring the specimen and the device as a whole to other CNC equipment. The clamping end of the device can be automatically positioned and can be conveniently clamped on the machine tool flat-nose pliers. After flipping, it can be automatically positioned by deflecting at a fixed angle. There is no need to re-find the center reference of the specimen and it can be directly processed. It can effectively ensure the specimen processing quality and achieve high-quality and high-efficiency processing of C-ring specimens.

[0031] Compared with the prior art, the device and method for efficiently processing C-ring stress corrosion specimens described in the present invention have the following advantages:

[0032] 1) The present invention realizes one-step processing and forming of the outer cylindrical surface of the C ring through the cooperation of the positioning piece, the C ring fixed connecting shaft, and the pressing piece;

[0033] 2) In the present invention, the multi-purpose cube and the hexagonal reducer are used to realize the simultaneous clamping and processing of multiple C-ring specimens. The notched reducer, the compression nut, and the positioning anti-slip nut are used to realize the fixation of multiple C-ring specimens, thereby improving the processing difficulty and efficiency of the C-ring specimens.

[0034] 3) The multi-purpose polyhedron in the present invention is a multi-purpose polyhedron that can be used to position the 60-degree notch of the C-ring specimen during processing, thereby improving the processing difficulty and efficiency of the notch of the C-ring specimen;

[0035] 4) The present invention facilitates cutting by a machining center tool by providing the first avoidance groove and the notch of the hexagonal reducer;

[0036] 5) The processing device of the present invention is easy to position, can reduce or eliminate the need to search for a reference, has a convenient clamping method and can protect the specimen from damage. The device itself has good reliability and ease of use. The device can provide efficient and stable processing for the specimen, realize rapid clamping, positioning and high-quality processing of the C-ring, improve quality and efficiency, and provide an important processing method for the implementation of metal stress corrosion testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of different loading methods of existing C rings;

[0038] Figure 2 This is the C ring structure diagram of the present invention;

[0039] Figure 3 This is a partial structural diagram of a C-ring stress corrosion specimen high-efficiency processing device of the present invention;

[0040] Figure 4 This is an exploded view of a C-ring stress corrosion specimen high-efficiency processing device according to the present invention;

[0041] Figure 5 It is a structural schematic diagram of the positioning spline shaft of the present invention;

[0042] Figure 6 It is a structural schematic diagram of the adapter sleeve of the present invention;

[0043] Figure 7 This is a schematic diagram of the structure of the C-ring fixed connecting shaft of the present invention;

[0044] Figure 8 It is a structural schematic diagram of the hexagonal reducer sleeve of the present invention;

[0045] Figure 9This is a schematic structural diagram of the notched reducer sleeve of the present invention;

[0046] Figure 10 It is a structural schematic diagram of the support member of the present invention;

[0047] Figure 11 This is a structural schematic diagram of the positioning anti-slip nut of the present invention;

[0048] Figure 12 This is a comparison chart of the time taken to process 50 pieces using the method of the present invention and the traditional method;

[0049] Figure 13 This is a comparison chart of the qualified rates of 50 pieces processed by the method of the present invention and the traditional method;

[0050] Figure 14 This is a first-view image of the 13mm thin plate C ring in the embodiment;

[0051] Figure 15 This is a second viewing angle of the 13mm thin plate C ring in the embodiment.

[0052] Description of reference numerals:

[0053] 100-C ring, 101-outer cylindrical surface, 102-inner cylindrical surface, 103-pin hole, 104-C ring notch, 200-C ring without pin hole, 1-C ring fixed connecting shaft, 11-guide pin, 12-positioning outer cone, 13-threaded sleeve, 14-multi-purpose cube, 15-shaft body, 151-first avoidance groove, 152-second avoidance groove, 153-notch indicator, 154-first external thread, 155-center hole, 156-first section, 157-second section, 2-positioning piece, 21-positioning spline shaft, 211-cylindrical shaft body , 212-positioning inner cone, 213-first transmission spline, 22-adapter sleeve, 221-second transmission spline, 222-first internal thread, 3-pressing piece, 31-notch reducing sleeve, 311-notch, 312-first cylindrical sleeve, 32-hexagonal reducing sleeve, 321-positioning boss, 322-second cylindrical sleeve, 323-hexagonal clamping end, 33-pressing nut, 34-positioning anti-slip nut, 341-anti-slip embossing, 342-second internal thread, 4-support, 41-seat, 42-C ring support arc surface, 5-machining center end mill. DETAILED DESCRIPTION

[0054] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0055] The design concept of this invention is as follows: since the length of the C-ring specimen in the SL and ST directions is along the thickness of the sheet metal, meaning the total specimen length is equal to the sheet metal thickness, wire cutting is typically used to cut the blank into a cylinder with a diameter slightly larger than the outer diameter of the C-ring (allowing a certain machining allowance). Conventional machining methods typically first machine the inner cylindrical surface of the C-ring to the dimensions specified in the drawing using drilling, boring, milling, and reaming. These conventional machining processes and methods can ensure the dimensional accuracy and roughness of the inner cylindrical surface. The outer cylindrical surface, however, is typically clamped using a three-jaw chuck on a CNC lathe. Because there is no excess clamping allowance along the length of the blank, machining cannot be completed in one go. Reversing the clamping process is necessary, and only one piece can be machined at a time. Furthermore, reversing the clamping process can easily produce tool marks, which can affect the machining quality of the outer cylindrical surface of the C-ring. After the entire ring (both the inner and outer cylindrical surfaces are machined) is completed, it must be transferred to a CNC machining center for 60-degree notching. This requires further clamping, datuming, and positioning, which is labor-intensive and time-consuming. If the above problems can be solved, the problems of difficult processing and low efficiency of this type of C-ring specimens can be solved.

[0056] Based on the above problems, the present invention proposes a C-ring stress corrosion specimen high-efficiency processing device, such as Figures 1 to 15 As shown, the processed C-ring 100 includes an outer cylindrical surface 101, an inner cylindrical surface 102, a pin hole 103, and a C-ring notch 104. The thickness of the C-ring is less than 20 mm. The processing device includes a C-ring fixed connecting shaft 1, a positioning member 2, a clamping member 3, a support member 4, and a machining center end mill 5. The positioning member 2 and the clamping member 3 are installed at both ends of the C-ring fixed connecting shaft 1. The C-ring sample is sleeved on the C-ring fixed connecting shaft. The C-ring sample is a cylindrical structure, which consists of a preset outer cylindrical surface and an inner cylindrical surface. The C-ring sample is processed to obtain a C-ring. The support member 4 is used to support the C-ring fixed connecting shaft to reduce vibration during the machining of the C-ring notch and ensure the quality of machining. The machining center end mill 5 is used to machine the C-ring notch 104. The device of the present invention machines the preset outer cylindrical surface of the C-ring sample into the outer cylindrical surface of the C-ring and machines the C-ring notch. The thickness referred to in the present invention is as follows: Figure 2 L shown.

[0057] Specifically, the C-ring fixed connection shaft 1 includes at least a guide pin 11, a positioning outer cone 12, a threaded sleeve 13, a multi-purpose polygonal body 14, and a shaft 15. The guide pin 11 is connected to the positioning outer cone 12, the positioning outer cone 12 is connected to the threaded sleeve 13, the threaded sleeve 13 is connected to the multi-purpose polygonal body 14, and the multi-purpose polygonal body 14 is connected to the shaft 15. During processing, the C-ring specimen is mounted on the shaft 15. The provision of the guide pin, positioning outer cone, threaded sleeve, multi-purpose polygonal body, and shaft facilitates the clamping of the C-ring specimen, allowing the processing of C-ring specimens with a thickness of less than 20 mm, while also ensuring accurate positioning, high clamping efficiency, and higher quality of the processed C-ring.

[0058] Specifically, the selection of the multi-purpose polyhedron is determined according to the notch of the processed C-ring sample. As a preferred embodiment of the present application, the notch of the C-ring sample processed in the present application is 60 degrees, and the selected multi-purpose polyhedron is a multi-purpose hexagon. The multi-purpose hexagon has three main functions: First: the relative faces of the hexagon are parallel, and can be clamped with flat-nose pliers of a CNC machining center; Second: the hexagon is deflected ±60 degrees along the axis to ensure that its orientation remains unchanged, so that the milling of the 60-degree notch of the C-ring sample can be completed without tool alignment (the 60-degree notch is milled twice, and each time the connecting shaft is deflected ±60 degrees, and half of the notch is milled off); Third: the hexagon facilitates the disassembly and assembly between the C-ring fixed connecting shaft and the adapter sleeve using a wrench.

[0059] More specifically, the guide pin 11, the positioning outer cone 12, the threaded sleeve 13, the multi-purpose polygonal body 14, and the shaft body 15 are an integrated structure.

[0060] Specifically, the support member 4 includes a base body 41 and a C-ring support arc surface 42. The C-ring support arc surface is in contact with the C-ring sample. On the one hand, it can play a supporting role to avoid vibration during processing. On the other hand, it can perform positioning in the Z-axis direction of the machining center, and can realize batch processing without having to find the tool height reference each time processing.

[0061] Preferably, the guide pin 11 is a cylindrical guide pin.

[0062] Specifically, the diameter of the shaft body 15 is equal to the diameter of the inner cylindrical surface 102 of the workpiece to be processed or the C-ring, so that the C-ring with the processed inner cylindrical surface can be sleeved on the shaft body.

[0063] Specifically, the shaft body 15 is provided with a first clearance groove 151 and a second clearance groove 152. Preferably, the first and second clearance grooves are connected, with the first clearance groove being located near the threaded sleeve, while the second clearance groove extends toward the end away from the threaded sleeve and to the end of the shaft body. The second clearance groove is a tool clearance groove on the notch body used for machining the C-ring. The diameter of the second clearance groove (forming a step with the shaft body) is greater than the diameter of the inner cylindrical surface of the C-ring and smaller than the diameter of the outer cylindrical surface, thereby preventing the shaft body from being machined by the CNC lathe when machining the outer cylindrical surface.

[0064] Specifically, a notch indicator 153 is provided on the shaft body 15. The notch indicator 153 is a narrow notch milled by an end mill. The notch indicator 153 is located between the multi-purpose hexagon and the first air avoidance groove. The notch indicator is mainly used to locate the C-ring notch position. The 60-degree notch direction is generally divided into L or T direction, and marks will be made when processing the blank.

[0065] Specifically, the end of the shaft body 15 away from the threaded sleeve is provided with a first external thread 154 and a center hole 155 for fixing the sample with a nut and fixing the C-ring on the lathe center to fix the connecting shaft.

[0066] Specifically, the shaft body 15 includes a first section 156 and a second section 157 that are connected to each other. The diameter of the first section is larger than the diameter of the second section. The multi-purpose hexagon is sleeved on the first section. The notch indicator 153 and the first air avoidance groove are arranged on the first section, and the second air avoidance groove is arranged on the second section.

[0067] Specifically, the positioning member 2 includes a positioning spline shaft 21 and an adapter sleeve 22. The positioning spline shaft 21 cooperates with the guide pin 11 and the positioning outer cone 12, and the adapter sleeve 22 cooperates with the threaded sleeve 13. The guide pin and positioning outer cone in this arrangement facilitate connection with the positioning spline shaft and ensure coaxiality. The threads of the threaded sleeve are mainly used to connect with the adapter sleeve.

[0068] Specifically, the positioning spline shaft 21 includes a cylindrical shaft body 211, a positioning inner cone 212, and a first transmission spline 213. The cylindrical shaft body 211 is connected to the positioning inner cone 212, and the positioning inner cone 212 is connected to the first transmission spline 213. The cylindrical shaft body cooperates with the guide pin, the positioning outer cone cooperates with the positioning inner cone, and the first transmission spline cooperates with the adapter sleeve. In this setting, the cylindrical shaft body is used for clamping the three-jaw or four-jaw chuck of the CNC lathe. The diameter of the other end of the cylindrical shaft body is slightly larger and is used to press against the chuck for axial positioning. The inner conical surface of the cylindrical shaft body is used to cooperate with the outer conical surface of one end of the C-ring fixed connecting shaft to achieve coaxial positioning. The spline on the cylindrical shaft body is used to cooperate with the spline on the adapter sleeve, and the rotation of the chuck drives the spline and the connecting shaft to rotate together.

[0069] Specifically, the adapter sleeve 22 is provided with a second transmission spline 221 and a first internal thread 222. The second transmission spline 221 mates with the first transmission spline 213, and the first internal thread 222 connects to the external thread of the threaded sleeve. In this arrangement, the length of the first internal thread is shorter than that of the adapter sleeve, thereby providing axial fixation when connected to the C-ring fixed connection shaft.

[0070] Specifically, the clamping part 3 includes a notched reducing sleeve 31, a hexagonal reducing sleeve 32, a clamping nut 33, and a positioning anti-slip nut 34. The notched reducing sleeve 31, the hexagonal reducing sleeve 32, the clamping nut 33, and the positioning anti-slip nut 34 are all sequentially sleeved on the C-ring fixed connecting shaft. Specifically, the notched reducing sleeve 31, the hexagonal reducing sleeve 32, the clamping nut 33, and the positioning anti-slip nut 34 are all sequentially sleeved on the second section.

[0071] Specifically, the inner diameter of the notched reducer 31 is consistent with the diameter of the C-ring fixed connection shaft, and the outer diameter is smaller than the outer cylindrical diameter of the C-ring specimen. The main purpose is to fix the C-ring specimen on the C-ring fixed connection shaft by squeezing the nut and the reducer.

[0072] Specifically, the notch reducer 31 includes a notch 311 and a first cylindrical sleeve 312. The first cylindrical sleeve is arranged on the second section of the shaft body and extends to a point on the first external thread 154 to contact the fastening nut to fix the C-ring specimen. The notch is mainly used for avoiding the milling cutter when processing the 60-degree notch of the C-ring.

[0073] Specifically, the hexagonal reducing sleeve 32 includes a positioning boss 321, a second cylindrical sleeve 322, and a hexagonal clamping end 323. The positioning boss is embedded in the second air avoidance groove so that the orientation of the hexagonal clamping end is consistent with the orientation of the multi-purpose hexagon on the C-ring fixed connecting shaft, and the size of the hexagon is also consistent, so that it can be clamped with flat-nose pliers when performing 60-degree notch processing on the machining center.

[0074] Specifically, the compression nut 33 is used to fix the C-ring, the notched reducing sleeve, and the hexagonal reducing sleeve on the C-ring fixed connecting shaft.

[0075] Specifically, the positioning anti-slip nut 34 is used for axial positioning in the vise of a machining center, ensuring consistent positioning of each batch of specimens, eliminating the need for tool setting and datuming for each batch. Preferably, the outer diameter of the anti-slip nut is larger than the inscribed diameter of the hexagonal object held by the vise, so that its surface can be pressed against the side of the vise for positioning.

[0076] Specifically, the exterior of the positioning anti-slip nut 34 is provided with an anti-slip embossing 341 , and the interior of the positioning anti-slip nut is provided with a second internal thread 342 , which is threadably connected to the first external thread 154 .

[0077] The device of the present invention has the following advantages:

[0078] First, the device can use the inner cylindrical surface, which is easier to process, as a reference; second, it can realize the one-time processing of the outer cylindrical surface; third, it can realize the simultaneous clamping and processing of multiple C-ring specimens; fourth, it can take into account the processing of the 60-degree notch of the C-ring specimen; fifth, the device is easy to position, which can reduce or eliminate the need to find a reference; sixth, the device is convenient for cutting by the machining center tool; seventh, the clamping method is convenient and can protect the specimen from damage; eighth, the device itself has good reliability and ease of use.

[0079] The present invention also provides a method for efficiently processing a C-ring stress corrosion specimen, which uses the processing device described above and includes the following steps:

[0080] S1. Obtain a C-ring specimen, which is a cylindrical structure consisting of a preset outer cylindrical surface and an inner cylindrical surface;

[0081] Specifically, the blank is first cut into a cylinder using wire cutting. The outer diameter of the cylinder is designed to be slightly larger than the outer diameter of the C-ring (allowing a certain machining allowance of 1-3mm). The inner cylindrical surface is then machined on a CNC lathe. Drilling, boring, and reaming are typically used to ensure the dimensional accuracy and roughness of the hole, until the inner hole is machined to the dimensions specified on the C-ring drawing.

[0082] S2, fix the positioning piece;

[0083] Specifically, the cylindrical shaft body of the positioning spline shaft is fixed by a three-jaw or four-jaw chuck of a CNC lathe and aligned.

[0084] S3. Assemble the C-ring fixed connecting shaft and the pressing piece, install the C-ring specimen, mark the notch position, and process the outer cylindrical surface;

[0085] Place the C-ring specimen, with its machined inner cylindrical surface, onto the shaft of the C-ring fixed connection. Align the pre-marked 60-degree notch with the notch indicator on the shaft. Install the notch reducer and hexagonal reducer, respectively, and tighten with a compression nut. Thread the C-ring fixed connection shaft, with the C-ring specimen secured, onto the adapter sleeve. Then, align the outer tapered surface of the connecting shaft with the inner tapered surface of the spline shaft. Use the CNC lathe's tailstock center to push against the center hole at the end of the connecting shaft. This completes the clamping process on the CNC lathe.

[0086] S4. After the above clamping is completed, the outer cylindrical surface can be processed in batches by integral molding. The outer cylindrical surface is processed using existing technology. After the outer cylindrical surface is processed, the next step of 60-degree notch processing can be carried out. S4 specifically includes the following steps:

[0087] S41. Loosen the tailstock center of the CNC lathe, remove the adapter sleeve connected to the C-type fixed connecting shaft, and screw the positioning anti-slip nut on the other end of the C-type fixed connecting shaft;

[0088] S42. Place the entire C-shaped fixed connecting shaft into the flat-nose pliers of the CNC machining center, support it with a support base, and place the end face of the anti-slip positioning nut against the side of the flat-nose pliers. Clamp the connecting shaft and the hexagonal flat surface of the hexagonal reducer with the flat-nose pliers to begin machining the 60-degree notch. Because the tool axis of a three-axis machining center is always perpendicular to the worktable, after machining half of the notch, rotate the C-ring fixed connecting shaft 60 degrees and then machine the other half of the notch. If using a four-axis machining center, there is no need to flip the shaft; the entire 60-degree notch can be machined by rotating the machine's fourth axis.

[0089] Through the above steps, all the processing of the inner cylindrical surface, the outer cylindrical surface, and the 60-degree notch is completed, and the C ring 200 without the pin hole is obtained. Figure 4 As shown, multiple C-rings with unprocessed pin holes are superimposed. Since the pin holes have a relatively simple processing technology, they can be easily positioned through the processed 60-degree notches, so they can be processed according to conventional processing methods.

[0090] This method only requires transferring the specimen and the device as a whole to other CNC equipment. The clamping end of the device can be automatically positioned and can be conveniently clamped on the machine tool flat-nose pliers. After flipping, it can be automatically positioned by deflecting at a fixed angle. There is no need to re-find the center reference of the specimen and it can be directly processed. It can effectively ensure the specimen processing quality and achieve high-quality and high-efficiency processing of C-ring specimens.

[0091] According to the present invention, a highly efficient C-ring stress corrosion test specimen processing apparatus and method was developed. Processor A, a skilled worker with fifteen years of specimen processing experience and a technician qualification certificate, was employed. We selected a 13mm thick aluminum alloy sheet as the blank and processed 50 C-ring specimens. To compare with conventional processing methods, we also processed 50 C-ring specimens using conventional methods. For C-rings processed with sheet metal thicknesses less than 20mm, the length of the C-ring is equal to the thickness of the blank, resulting in a lack of clamping positions that allow for a single clamping process. Therefore, the conventional method involves machining the C-ring specimen's pre-set outer cylindrical surface in two stages. First, the lathe chuck clamps the pre-set outer cylindrical surface (pre-machined to a cylindrical shape with a certain margin) for approximately one-third of the specimen's length. The lathe then turns and machined the other end. After lathing, the intermediate cutter joint is smoothed with fine sandpaper. This process can only process one piece at a time, which is inefficient and will cause tool change each time, so it cannot be completed in one go. The quality is unstable and the notch needs to be re-clamped and positioned, making the process cumbersome. Figures 14 and 15 , and compiled the following relevant data.

[0092] Table 1 Statistics of samples before testing

[0093] method Number of pieces Material Sample shape before processing Specifications (mm) Qualified The present invention 50 aluminum alloy Inner cylinder machined 20-17-13 yes Conventional methods 50 aluminum alloy Inner cylinder machined 20-17-13 yes

[0094] Table 2 Test results of the present invention (time: minutes)

[0095] batch Number of pieces processed Processing personnel Clamping time Adjust time Processing time Total time Time per piece Pass rate 1 50 A 40 10 120 170 3.4 100%

[0096] Table 3 Conventional method test results (time: minutes)

[0097] batch Number of pieces processed Processing personnel Clamping time Adjust time Processing time Total time Time per piece Pass rate 1 50 A 240 120 250 610 12.2 70%

[0098] Through Tables 1~3 and Figure 12 、 Figure 13 As can be seen, the present invention saves a significant amount of clamping and adjustment time, and significantly improves specimen processing quality. This device and application method can complete the processing of C-ring specimens with high quality and efficiency; traditional processing methods have significant uncertainty in quality control and test progress. The invention of a high-efficiency C-ring stress corrosion specimen processing device and method provides a highly effective solution for processing such specimens.

[0099] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A C-ring stress corrosion specimen high-efficiency processing device, characterized in that: The invention comprises a C-ring fixed connecting shaft (1), a positioning member (2), and a pressing member (3), wherein the positioning member (2) and the pressing member (3) are respectively installed at the two ends of the C-ring fixed connecting shaft (1), and the C-ring fixed connecting shaft (1) comprises a guide pin (11), a positioning outer cone (12), a threaded sleeve (13), a multi-purpose multi-cube (14), and a shaft (15), wherein the guide pin (11) is connected to the positioning outer cone (12), the positioning outer cone (12) is connected to the threaded sleeve (13), the threaded sleeve (13) is connected to the multi-purpose multi-cube (14), and the multi-purpose multi-cube (14) is connected to the shaft (15), and the C-ring sample is sleeved on the C-ring fixed connecting shaft (1); the shaft (15) is provided with a first avoidance groove (151) and a second avoidance groove (152). The first avoidance groove (151) and the second avoidance groove (152) are connected, the first avoidance groove (151) is close to the threaded sleeve (13), and the second avoidance groove (152) extends to the end away from the threaded sleeve (13) and extends to the end of the shaft body (15); a notch indicator position (153) is provided on the shaft body (15), and the notch indicator position (153) is located between the multi-purpose multi-cube (14) and the first avoidance groove (151); the pressing member (3) includes a notch reducing sleeve (31), a hexagonal reducing sleeve (32), a pressing nut (33), and a positioning anti-slip nut (34), and the notch reducing sleeve (31), the hexagonal reducing sleeve (32), the pressing nut (33), and the positioning anti-slip nut (34) are all sequentially sleeved on the C-ring fixed connection shaft (1).

2. The processing device according to claim 1, characterized in that The guide pin (11), the positioning outer cone (12), the threaded sleeve (13), the multi-purpose cube (14), and the shaft (15) are an integrated structure.

3. The processing device according to claim 1, characterized in that The positioning member (2) comprises a positioning spline shaft (21) and an adapter sleeve (22); the positioning spline shaft (21) cooperates with the guide pin (11) and the positioning outer cone (12); and the adapter sleeve (22) cooperates with the threaded sleeve (13).

4. The processing device according to claim 3, characterized in that The positioning spline shaft (21) comprises a cylindrical shaft body (211), a positioning inner cone (212), and a first transmission spline (213); the cylindrical shaft body (211) is connected to the positioning inner cone (212); the positioning inner cone (212) is connected to the first transmission spline (213); the cylindrical shaft body (211) cooperates with the guide pin (11); the positioning inner cone (212) cooperates with the positioning outer cone (12); and the first transmission spline (213) cooperates with the adapter sleeve (22).

5. The processing device according to claim 4, characterized in that A second transmission spline (221) and a first internal thread (222) are provided in the adapter sleeve (22); the second transmission spline (221) cooperates with the first transmission spline (213); and the first internal thread (222) is connected to the external thread of the threaded sleeve (13).

6. The processing device according to claim 1, characterized in that The hexagonal reducing sleeve (32) comprises a positioning boss (321), and the positioning boss (321) is embedded in the second air-avoiding groove (152).

7. A method for efficiently processing a C-ring stress corrosion test specimen, using the processing device according to any one of claims 1 to 6, characterized in that: The steps include: S1. Obtain a C-ring specimen, which is a cylindrical structure consisting of a preset outer cylindrical surface and an inner cylindrical surface; S2, fix the positioning piece; S3. Assemble the C-ring by fixing the connecting shaft and the pressing piece, install the C-ring sample, mark the notch position, and process the outer cylindrical surface of the C-ring; S4. Process the C-ring notch.

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