A device for processing a C-ring specimen and a processing method thereof

Abstract

The application provides a device for processing a C-shaped ring sample and a processing method thereof. The device for processing the C-shaped ring sample comprises a base, a clamping plate and a positioning block. The positioning block is arranged on the top of the base. The clamping plate is connected or separated from the base through the positioning block. The base is connected or separated from a numerical control machine tool. A containing groove is formed between the clamping plate and the base. The C-shaped ring sample is arranged in the containing groove. The top of the C-shaped ring sample is connected with the bottom of the clamping plate. The bottom and / or the outer side wall of the C-shaped ring sample are connected with the base. The device and the processing method can guarantee quick positioning in the processing process, improve the processing quality of the C-shaped ring, improve the processing efficiency, reduce the complexity of the processing technology, enable the C-shaped ring sample to complete the processing of the bolt hole and the notch in one clamping, improve the safety of the sample, and prolong the service life of the processing device.

Description

Technical Field

[0001] This invention relates to the field of metal material sample processing technology, and more specifically, to a device and processing method for efficient positioning and processing of C-ring samples using a CNC machining center. Background Technology

[0002] C-rings are a versatile and economical specimen used to determine the stress corrosion cracking susceptibility of metallic materials. They are suitable for various product forms, including weldments, and are particularly suitable for testing pipes, rods, and plates. They are an important specimen form for evaluating the stress corrosion resistance of metals.

[0003] In addition, C-ring specimens are usually subjected to constant displacement loading, that is, the bolts are tightened along the central direction of the ring diameter, which generates tensile stress on the outer surface of the ring. Alternatively, the ring can be unfolded and loaded in the opposite direction to generate tensile stress on the inner surface. Therefore, C-ring specimens have high requirements for processing. The surface roughness, size, hole position deviation, etc. have a great influence on the test results, directly affecting the stress state and thus the test results.

[0004] Currently, the processing of this sample mainly utilizes equipment such as sawing machines, CNC lathes, and CNC machining centers. The general process can be divided into blanking, turning the outer diameter, turning the inner diameter, machining the notch, and machining the hole. Among these, the blanking, turning the inner and outer diameters are relatively mature processes, which can effectively ensure the surface roughness and dimensional tolerances of the entire ring. However, machining the notch and bolt holes requires the entire ring, which has already been precision-machined on the lathe, to be clamped twice on the CNC machining center. Since the lathe has already precision-machined the entire ring to its dimensions and surface roughness, the secondary clamping for machining the notch and bolt holes can easily cause damage to the ring surface, thus affecting the roughness. Furthermore, the secondary clamping makes it difficult to ensure that the bolt hole axis is perpendicular to the notch centerline (i.e., there is a positional deviation). Because the direction of the principal stress of the C-ring should be perpendicular to the surface with the least resistance to stress corrosion cracking, otherwise cracks may occur somewhere outside the center of the ring. The roughness and deviation of the bolt holes can easily cause uneven stress on the ring's bearing surface, which will have a significant impact on the test results. To ensure the processing quality of the specimen, the commonly used method is to first machine the notch with a machining center, then rotate the specimen 90 degrees, then use a square to press one side against the notch, and then clamp the specimen for hole processing. Since the annular specimen has no flat surface as support, it is very easy for the specimen to deflect when using a square for positioning. The operator needs to use the machining center tool setter to find the reference and adjust the machine tool's coordinate system. This method is highly dependent on the operator's skill level and is prone to problems such as unstable processing quality and low processing efficiency. Most of the literature and patents on C-rings are related to experimental research, and there is less research on sample preparation and processing methods. Therefore, it is of great significance to study how to improve the processing efficiency and accuracy of C-ring specimens.

[0005] Patent CN110514577A mentions an experimental apparatus and method for evaluating crevice corrosion of oil casing under stress, including a crevice clamp and a stress loading bolt. During the experiment, two circular holes are made circumferentially on a C-shaped ring sample of the oil casing. The crevice clamp is held on both sides of the C-shaped ring sample relative to its open end. The stress loading bolt passes through the two circular holes circumferentially on the C-shaped ring sample and is tightened with a nut. A set loading stress is applied to the C-shaped ring sample by rotating the nut. The C-shaped ring sample is made by machining an oil pipe or casing into a ring and cutting off 1 / 4 of the circumference. The line connecting the centerlines of the two circular holes passes through the center of the C-shaped ring sample. This method can characterize the crevice corrosion behavior of the oil casing string under stress. However, the processing efficiency and accuracy of the C-shaped ring sample are relatively low. Summary of the Invention

[0006] In view of this, the present invention aims to provide an apparatus and method for processing C-ring specimens, to solve the problems in the prior art where the C-ring specimen cannot be precisely and quickly positioned when machining notches and bolt holes using a CNC machining center, resulting in poor quality, low processing efficiency, and complex processing technology. This invention effectively improves the accuracy of machining notches and bolt holes on C-ring specimens using a CNC machining center, ensures rapid positioning during processing, thereby improving the quality of C-ring processing, increasing processing efficiency, reducing processing complexity, enabling the machining of bolt holes and notches on the C-ring specimen in a single clamping operation, and also improving specimen safety and extending the service life of the processing apparatus.

[0007] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0008] This invention relates to an apparatus and method for processing C-ring specimens. The apparatus includes 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 in the receiving groove. The top of the C-ring specimen is connected to the bottom of the clamping plate. The bottom and / or outer wall of the C-ring specimen are connected to the base. The apparatus is used to achieve precise positioning of the C-ring specimen through clamping action and to enable efficient processing of the specimen by a CNC machine tool.

[0009] Furthermore, the base includes a support seat 1 and a support seat 2. One end of the support seat 2 is connected to the support seat 1, and the other end of the support seat 2 is connected to or separated from the CNC machine tool. The positioning block is set on the top of the support seat 1 near one end of the support seat 2.

[0010] Furthermore, a support includes a bolt hole, which is provided on the support in a top-to-bottom manner.

[0011] Furthermore, the device includes a stud and a nut. One end of the stud is connected to or separated from a bolt hole, and the other end of the stud is detachably connected to the nut and the clamping plate, respectively. The inner sidewalls of the nut and the clamping plate are in contact with the outer sidewall of the stud. The nut is located on the top of the clamping plate and is used to press the clamping plate tightly against the top of the base through the interaction of the nut and the stud.

[0012] Furthermore, the clamping plate includes a buffer pad, which is located at the bottom of the clamping plate to prevent the sample from being damaged by the device and to improve the processing safety of the sample.

[0013] Furthermore, the clamping plate also includes a first clamping plate and a second clamping plate. One end of the first clamping plate is connected to the second clamping plate, and the other end of the first clamping plate is connected to the base through a positioning block. The end of the first clamping plate near the second clamping plate is connected to the base through a stud.

[0014] Furthermore, the clamping plate includes a first through hole and a second through hole, both of which are disposed through the clamping plate. The inner wall of the first through hole is connected to the outer wall of the stud, and the inner wall of the second through hole is fitted to the outer wall of the positioning block.

[0015] Furthermore, the positioning block includes a positioning block 1 and a positioning block 2. The bottom of positioning block 1 is connected to the base through positioning block 2, and the outer side of positioning block 1 is engaged with the clamping plate. Both positioning block 1 and positioning block 2 are prisms.

[0016] Furthermore, the support includes a support block, a first support plate, and a second support plate. One side of the support block is connected to the second support, and the other side of the support block is connected to the first support plate and the second support plate respectively. The first support plate and the second support plate are set perpendicularly. A bolt hole is provided on the side of the support block away from the second support, and a positioning block is provided on the side of the support block close to the second support. The support block is connected to the clamping plate through the studs and positioning blocks provided in the bolt hole respectively. A receiving groove is formed between the clamping plate, the support block, the first support plate, and the second support plate.

[0017] A processing method for a C-ring specimen processing apparatus, wherein the processing method uses the aforementioned C-ring specimen processing apparatus, and the method includes the following steps:

[0018] Step 1: Pre-machining of the ring: The blank material is machined into a ring with the required dimensions and surface roughness as specified in the drawing using a CNC machine tool;

[0019] Step 2: Clamping the ring in the processing device: Place the ring inside the base and engage the clamping plate with the positioning block on the base through the second through hole. The clamping plate is set outside the stud through the first through hole, and under the action of the nut, the clamping plate and the base cooperate to complete the ring clamping.

[0020] Step 3, Translational Machining: The CNC machine tool is connected to the two support bases for one-time sample machining;

[0021] Step 4, Secondary Rotation and Processing: The CNC machine tool drives the two support seats that are set in a self-centering and positioning manner to produce the required C-ring sample.

[0022] Compared with the prior art, the apparatus and method for processing C-ring samples described in this invention have the following advantages:

[0023] The aforementioned processing device and method can effectively improve the accuracy of machining notches and bolt holes on C-ring specimens using CNC machining centers, and ensure rapid positioning during the processing, thereby improving the machining quality of C-rings, increasing processing efficiency, reducing the complexity of the processing technology, and enabling the machining of bolt holes and notches on C-ring specimens in a single clamping operation. It also helps to improve the safety of the specimens and extend the service life of the processing device. In addition, the device is easy to position, reducing or eliminating the need to find a reference. When using the device for processing, it facilitates the cutting of the machining center tool. The clamping method is convenient and can protect the specimen from damage. The device itself is highly durable. Attached Figure Description

[0024] The accompanying drawings, which constitute a part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0025] Figures 1a-1c Schematic diagram of different loading states for a C-shaped ring;

[0026] Figure 2 An exploded view of the device for rapid and efficient positioning and machining of C-ring samples by a CNC machining center;

[0027] Figures 3a-3b A three-dimensional schematic diagram of a Y-shaped clamping plate at different angles;

[0028] Figure 4 This is a schematic diagram of a semi-enclosed base structure;

[0029] Figure 5 This is a schematic diagram of a precision-machined circular ring;

[0030] Figure 6 Schematic diagram of C-ring sample;

[0031] Figure 7 This is a schematic diagram of the device and sample installation;

[0032] Figures 8a-8b Different viewing angles corresponding to the clamping end and the center of the sample notch and screw hole (where, Figure 8aThis is a top view. Figure 8b (Rear view) Schematic diagram;

[0033] Figures 9a-9d For the semi-enclosed positioning base plane (where, Figure 9a Main view, Figure 9b Left view, Figure 9c This is a top view. Figure 9d First-person perspective 3D view (illustration);

[0034] Figures 10a-10c For the plane of the Y-shaped clamping plate (where, Figure 10a This is a top view. Figure 10b Main view, Figure 10c (Right view) Schematic diagram;

[0035] Figures 11a-11d Schematic diagrams of the Hopkinson tie rod sample drawing from different perspectives;

[0036] Figure 12 This diagram illustrates a comparison of processing time between existing techniques and the method described in this application.

[0037] Explanation of reference numerals in the attached drawings: 1. Base; 11. Support 1; 111. Bolt hole 1; 112. Support block; 113. First support plate; 114. Second support plate; 115. Drill hole clearance groove; 116. Tool clearance groove; 12. Support 2; 2. Clamping plate; 21. Clamping plate 1; 211. First through hole; 212. Second through hole; 22. Clamping plate 2; 23. Buffer protective pad; 3. Positioning block; 31. Positioning block 1; 32. Positioning block 2; 4. Receiving groove; 5. Stud; 51. Nut. Detailed Implementation

[0038] The inventive concepts of this disclosure will be described below using terminology commonly used by those skilled in the art to communicate the essence of their work to others skilled in the art. However, these inventive concepts may be embodied in many different forms and should not be construed as limited to the embodiments described herein.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0040] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] This embodiment pertains to a device for processing C-ring specimens. Similar to conventional devices for processing C-ring specimens, the overall structure consists of a C-ring, bolts, and clamps.

[0043] In existing technologies, to ensure the surface roughness and dimensional accuracy of the C-ring during processing, it is generally necessary to first use a CNC lathe to finish the entire ring; then use a machining center to process its notch and bolt holes. Since the center line of the notch and the axis of the bolt holes must be perpendicular, the processing cannot be completed simultaneously in one clamping, and the sample needs to be clamped twice. This means that whether the hole or the groove is processed first, one must be used to find the other reference and adjust the coordinate system of the machine tool. Manual clamping and finding the reference can easily cause cumulative errors, affecting the processing quality and resulting in low efficiency.

[0044] To address the problems in existing C-ring specimen machining processes using CNC machining centers, such as the inability to achieve precise and rapid positioning, resulting in poor quality, low efficiency, and complex processing, this embodiment proposes a device and method for machining C-ring specimens. The device includes a base 1, a clamping plate 2, and a positioning block 3. The positioning block 3 is positioned on top of the base 1. The clamping plate 2 is connected to or separated from the base 1 via the positioning block 3. The base 1 is connected to or separated from a CNC machine tool. A receiving groove 4 is formed between the clamping plate 2 and the base 1. The C-ring specimen is placed in the receiving groove. Inside the groove 4, the top of the C-ring sample is connected to the bottom of the clamping plate 2. The bottom and / or outer wall of the C-ring sample are connected to the base 1. This is used to achieve precise positioning of the C-ring sample through the clamping action of the device, and to enable efficient processing of the sample by a CNC machine tool. The base 1 is a semi-enclosed structure, and the clamping plate 2 is Y-shaped. In this embodiment, the bottom refers to the lower surface of the component in the direction shown in the figure, and the top refers to the upper surface of the component in the direction shown in the figure. Preferably, the base 1, the clamping plate 2, and the positioning block 3 are all made of Ti80 material to improve the portability of the device and to have the characteristics of high strength and good durability.

[0045] The semi-enclosed positioning base 1, Y-shaped clamping plate 2, and positioning block 3 effectively improve the accuracy of C-ring specimens when machining notches and bolt holes using a CNC machining center. They also ensure rapid positioning during the machining process, thereby improving the machining quality of the C-ring, increasing machining efficiency, reducing the complexity of the machining process, and enabling the C-ring specimen to complete the machining of bolt holes and notches in a single clamping operation. Furthermore, they help improve the safety of the specimen and extend the service life of the machining device.

[0046] The base 1 includes a primary support 11 and a secondary support 12. One end of the secondary support 12 is connected to the primary support 11, and the other end of the secondary support 12 is connected to or separated from the CNC machine tool. Specifically, the right side of the secondary support 12 is connected to the left side of the primary support 11, and the outer wall of the end of the secondary support 12 away from the primary support 11 is either in contact with or separated from the CNC machine tool. The positioning block 3 is located on the top of the primary support 11 near the end of the secondary support 12. The secondary support 12 is columnar to facilitate the connection between the base 1 and the CNC machine tool. A fixed connection is provided, with a support 11 including a bolt hole 111, which is arranged from top to bottom on the support 11. The bolt hole 111 is internally threaded. The device includes a stud 5 and a nut 51. One end of the stud 5 is connected to or detached from the bolt hole 111, and the other end of the stud 5 is detachably connected to the nut 51 and the clamping plate 2. The thread of the stud 5 is externally threaded. The inner wall of the nut 51 and the clamping plate 2 fits against the outer wall of the stud 5. The nut 51 is located on the top of the clamping plate 2 and is used to press the clamping plate 2 onto the top of the base 1 through the interaction of the nut 51 and the stud 5. The external thread of the stud 5 engages or disengages with the internal thread of the nut 51 and the internal thread of the bolt hole 111. The support base 11 also includes a drilling clearance groove 115 and a tool clearance groove 116. Both the drilling clearance groove 115 and the tool clearance groove 116 are provided on the support base 11 and are connected to the receiving groove 4. The empty slot 115 is set on the support base 11 in a front-to-back direction to facilitate the drilling action of the C-ring sample by the machining tool after the base 1 is flipped. The tool clearance slot 116 is set on the support base 11 in a top-to-bottom direction to facilitate the cutting action of the tool during the machining of the C-ring sample. The positioning block 3 includes a positioning block 31 and a positioning block 32. The bottom of the positioning block 31 is connected to the base 1 through the positioning block 32, and the outer side of the positioning block 31 is engaged with the clamping plate 2.Both positioning block 31 and positioning block 32 are prisms. The length and width of positioning block 31 are smaller than those of positioning block 32, and the height of positioning block 31 is greater than or equal to the height of positioning block 32. There is a gap between the top of positioning block 32 and the top of the C-ring sample to facilitate the tilting of the center of gravity of the Y-shaped clamping plate 2 towards the C-ring sample, thereby increasing the clamping force of the device on the C-ring sample. In this embodiment, a chamfer is provided at the end of positioning block 31 away from positioning block 32 to improve the ease of assembly between positioning block 3 and clamping plate 2. The two supporting bases 12 are prisms to facilitate the connection between the base 1 and the C-ring sample. The clamping force between the machine tools is more stable. The two support seats 12 are the clamping ends of the base 1, and the two support seats 12 are set in a self-centering and positioning manner. That is, the two support seats 12 can automatically adjust the center position to achieve automatic centering and positioning. They can also have an automatic positioning function, which can be easily clamped on one side of the machine tool's universal vise. After flipping, they can be automatically centered and positioned, and can be directly processed without re-finding the center datum of the sample. This can effectively ensure the sample processing quality and achieve high-quality and high-efficiency processing of C-ring samples. Preferably, the two support seats 12 are cuboids.

[0047] By providing support 11 and support 22, the connection tightness between base 1 and each component can be improved. The shape of support 22 can maintain a certain gap between positioning block 3 and machine tool, and facilitate the installation of base 1 and machine tool, thereby improving the processing efficiency of C-ring sample processing using the processing device of this application. It also helps to enhance the stability of sample processing and plays a role in preventing slippage and falling off during sample flipping. In addition, the positioning block 3 can not only position clamping plate 2, but also improve the stability of the connection between positioning block 3 and clamping plate 2 through the shape of positioning block 3, thereby enhancing the positioning effect of positioning block 3 on clamping plate 2 and improving the safety and reliability of the device in the process of processing C-ring sample.

[0048] The clamping plate 2 includes a buffer pad 23, which is located at the bottom of the clamping plate 2. The buffer pad 23 is made of soft rubber and is used to prevent the sample from being damaged by the device, thereby improving the processing safety of the sample. The clamping plate 2 also includes a first clamping plate 21 and a second clamping plate 22, which are integrally formed. One end of the first clamping plate 21 is connected to the second clamping plate 22, and the other end of the first clamping plate 21 is connected to the base 1 through a positioning block 3. The end of the first clamping plate 21 near the second clamping plate 22 is connected to the base 1 through a stud 5. The first clamping plate 21 includes a first through hole 211 and a second through hole 212, both of which are through the first through hole 211 and the second through hole 212. The inner wall of the first through hole 211 is connected to the outer wall of the stud 5, which is used to improve the clamping plate 2 and the base. The stability of the connection between 1 and 2 is achieved by the inner wall of the second through hole 212 fitting against the outer wall of the positioning block 3 to position the clamping plate 2. The top of the clamping plate 22 is triangular in shape and includes a first plate hole and a second plate hole. The first plate hole and the second plate hole are arranged linearly on the clamping plate 22 to facilitate the increase of the clamping force on the C-ring sample while avoiding affecting the C-ring cutting action. In addition, it is also beneficial to reduce the cost of the processing device. In this embodiment, the first through hole 211 is a round hole and the second through hole 212 is a square hole. The inner diameter of the first through hole 211 is equal to the maximum outer diameter of the stud 5 plus α, where α is the error coefficient and is a positive number. The maximum outer diameter of the stud 5 refers to the diameter of the outermost part of the external thread of the stud 5.

[0049] By setting the first through hole 211 and the second through hole 212, the tightness of the connection between the clamping plate 2 and the base 1 can be effectively improved. It can also facilitate the installation of various components in the processing device, improve the clamping force of the clamping plate 2 on the C-ring sample, and reduce the cost of the processing device.

[0050] The support base 11 includes a support block 112, a first support plate 113, and a second support plate 114. One side of the support block 112 is connected to the support base 12, and the other side of the support block 112 is connected to the first support plate 113 and the second support plate 114 respectively. The first support plate 113 and the second support plate 114 are arranged perpendicularly. A bolt hole 111 is provided on the side of the support block 112 away from the support base 12, and a positioning block 3 is provided on the side of the support block 112 close to the support base 12. The support block 112 is connected to the clamping plate 2 through the studs 5 and the positioning block 3 provided in the bolt hole 111 respectively. A receiving groove 4 is formed between the clamping plate 2, the support block 112, the first support plate 113, and the second support plate 114. A drilling clearance groove 115 is provided at the end of the first support plate 113 away from the support block 112. The front side of the first support plate 113 is connected to the right arc of the support block 112. The drilling clearance groove 115 is... The tool clearance groove 116 is arc-shaped and located at the end of the second support plate 114 away from the support block 112. The tool clearance groove 116 is arc-shaped, and the two sides of the second support plate 114 near the tool clearance groove 116 are also arc-shaped. This facilitates the entry and exit of the CNC machine tool and avoids double wear of the processing device and the tool due to collision between the tool and the base 1. This improves the protection of the processing device and the tool and also helps to extend the service life of the processing device. In this embodiment, when the C-ring sample is installed in the processing device, the top of the C-ring sample is in contact with the bottom of the clamping plate 2, the bottom of the C-ring sample is in contact with the top of the second support plate 114, and the outer side of the C-ring sample is in contact with the right side of the support block 112 and the front side of the first support plate 113, respectively. At this time, the base 1 provides semi-enclosed support for the C-ring sample, and the base 1 and the clamping plate 2 cooperate to provide semi-enclosed clamping.

[0051] The arrangement of support block 112, first support plate 113, and second support plate 114 enhances the support of base 1 for C-ring specimens. The drilling clearance groove 115 and tool clearance groove 116 within the first and second support plates 113 and 114 facilitate the entry and exit of workpieces during machine tool processing. Furthermore, by using the first and second support plates 113 and 114 as reference surfaces for flipping and machining, secondary clamping of the specimen is avoided, enabling efficient and precise positioning of the C-ring specimen. This also improves the device's accuracy in positioning the specimen, reducing or eliminating the need to find a reference point. When using this device for machining, it facilitates cutting by machining center tools, provides convenient clamping, protects the specimen from damage, and is highly durable.

[0052] Furthermore, the specific processing method of the processing device is as follows: Based on the dimensions of the C-ring sample, a device with a semi-enclosed positioning base 1 and a clamping plate 2 (i.e., a Y-shaped clamping plate) is set up. The semi-enclosed positioning base 1 of this device can conveniently place the sample on the base 1, and the sample is limited by the three adjacent surfaces of the base 1 (the top of the second support plate 114, the front side of the first support plate 113, and the right side of the support block 112). Then, the sample is fixed to the base 1 by the Y-shaped clamping plate. A tool clearance groove 116 is provided on the top of the second support plate 114 of the base 1 to avoid… When machining the notch of the C-ring sample, the machine tool tool collides with the base 1; a drilling clearance groove 115 is provided on the front side of the first support plate 113 to prevent the drill bit from colliding with the base 1 when machining the bolt hole of the C-ring. At the same time, it is flipped to the bottom surface when machining the bolt hole, which can play the role of bottom surface support; a rectangular clamping end with a square cross section, namely the support base 12, is machined on the X-direction positioning surface. This clamping end is not located at the exact center of the surface, but is calculated by the positional relationship between the base 1 and the sample so that the center of clamping can always be aligned with the bolt hole 111 or notch to be machined during the flipping process. The center of the notch remains consistent; that is, when machining the notch, the clamping center of the two supporting seats 12 is perpendicular to and intersects the center of the notch. Therefore, they are the same in the Y coordinate of the machine tool. The X direction of the machine tool is positioned by the positioning surface being close to the side of the jaws of the machine tool vise, and the Z direction is positioned by the top of the second support plate 114 of the device. Therefore, the three-axis machining coordinate system of the machine tool is fixed by this device. When the notch is machined and the rotating device is rotated 90 degrees to machine the bolt hole 111, its clamping center is still perpendicular to and intersects the center of the bolt hole 111. Since the cross-section is square, This ensures that even if the machine tool is rotated 90 degrees, the X and Y coordinates remain the same. The Z-axis coordinate is fixed at the front of the first support plate 113 of the device, thus ensuring that there is no need to find the reference again. The Z-axis difference can be directly input into the CNC system of the machine tool through the height difference after the rotation, which is very convenient and fast, and the machining accuracy is high. The base 1 is also equipped with a square positioning block 3 and studs 5 and nuts 51 for pressing the Y-shaped clamping plate. The square positioning block 3 can better avoid the problem of the Y-shaped clamping plate moving left and right when the bolts are turned when fixing the C-ring sample with the Y-shaped clamping plate.

[0053] The aforementioned preparation device can greatly improve the efficiency of device preparation, enhance the accuracy of the setting of bolt hole 111, drilling clearance groove 115, tool clearance groove 116, clamping end and support base 12 within the device, and more accurately ensure that the reference point before and after the flipping device remains unchanged by calculating the positional relationship between the support base 12 and the sample. This improves the reliability of C-ring sample processing, provides efficient and stable processing for the sample, enables rapid clamping, positioning and high-quality processing of C-rings, improves processing quality and efficiency, and provides an important processing method for conducting metal stress corrosion testing.

[0054] A processing method for a C-ring specimen processing apparatus, wherein the processing method uses the aforementioned C-ring specimen processing apparatus, and the method includes the following steps:

[0055] Step 1: Pre-machining of the ring: The blank material is machined into a ring with the required dimensions and surface roughness as specified in the drawing using a CNC machine tool;

[0056] Step 2: Clamping the ring in the processing device: Place the ring inside the base 1, and engage the clamping plate 2 with the positioning block 3 on the base 1 through the second through hole 212. The clamping plate 2 is positioned outside the stud 5 through the first through hole 211. Under the action of the nut 51, the clamping plate 2 and the base 1 cooperate to clamp the ring. Specifically, place the processed ring on the semi-enclosed base 1 of the device, so that the cylindrical surface of the ring is in contact with the first side and the second side of the base 1 respectively, and the bottom surface of the ring is placed on the third side of the base 1 to fix their relative positions. The first side refers to the right side of the support block 112, the second side refers to the front side of the first support plate 113, and the third side refers to the top of the second support plate 114. Next, fit the first through hole 211 and the second through hole 212 of the Y-shaped clamping plate 2 into the stud 5 and the square positioning block 3 on the base 1, and tighten the nut 51 to complete the clamping of the sample.

[0057] Step 3, Translational Machining: Connect the CNC machine tool to the support base 12 for one-time sample machining. Specifically, place the clamping end of the base 1 of the machining device after clamping the C-ring sample, i.e., the end of the support base 12 away from the support base 11, along the X direction of the machine tool into one side of the precision flat jaw of the machine tool. The X direction is the direction from front to back as shown in the figure. The placement method can be from front to back or from back to front. Specifically, expose the part of the base 1 except for the clamping end of the flat jaw. The X-direction positioning surface of the base 1, i.e. the plane where the second support plate 114 is located, is in contact with the side of the flat jaw. At this point, the clamping of the device and the machine tool is completed, and the machining of the C-ring notch can begin. After the notch is machined, proceed to step 4.

[0058] Step 4, Secondary Rotation and Machining: The CNC machine tool drives the two support seats 12, which are set in a self-centering and positioning manner, to produce the required C-ring sample. Specifically, the entire device is rotated 90 degrees, and the plane where the first side of the base 1 is located behind the first support plate 113 is used as the bottom surface to start machining the bolt holes of the C-ring. Since the square cross-section of the two support seats 12, i.e., the clamping end size of the device, is fixed, and the X-direction positioning surface of the base 1 and the size of the flat-jaw vise are fixed, after rotation, the X and Y origins of the workpiece coordinate system of the machine tool are still the same, and there is no need to perform secondary tool setting. The height difference in the Z direction is adjusted to a fixed value. After calculation, the value is input into the CNC system to fix the X, Y, and Z axis coordinates, thereby achieving high-precision and high-efficiency machining. In this embodiment, the X axis refers to the straight line from front to back, the Y axis refers to the straight line from top to bottom, and the Z axis refers to the straight line from left to right. The origin of the X and Y axes before and after flipping is set according to the requirements. Preferably, the origin is O shown in the figure, but it is not limited to this. The Y-axis positioning surface refers to the plane on the rear side of the first support plate 113.

[0059] The device, based on the idea of ​​clamping C-ring samples once to unify the reference, uses a fixing device to fix the sample once, enabling rapid clamping, precise positioning, and accurate reference finding during C-ring sample processing. The sample processing method, through the inclusion of components such as a semi-enclosed positioning base 1, a Y-shaped clamping plate 2, milling clearance grooves (tool clearance grooves 116 and drilling clearance grooves 115), a buffer protective pad 23, and self-centering positioning clamping ends (support seats 12), not only ensures the processing accuracy of the sample but also improves processing efficiency, facilitating widespread application and reducing the need for secondary sample clamping. The manual square positioning is transformed into a single-clamping process, requiring only the device to be flipped. This effectively enables the machining of bolt holes and notches in a single clamping operation, improves the positioning accuracy of the device during the machining of C-ring specimens, helps avoid damage to the specimen during clamping, and enhances the safety and reliability of the specimen machining process. Furthermore, the C-ring specimen preparation method eliminates the need for finding a reference datum and positioning, as the device automatically ensures machining accuracy. This method has broad application prospects and potential economic and social benefits, and is of great importance and wide applicability in both military and civilian products. Example

[0060] According to the present invention, a high-efficiency positioning and processing device and processing method for CNC machining center of C-ring specimens were used to process 50 C-ring specimens. In order to compare with the previous processing method, 50 C-ring specimens were also processed using conventional methods. All specimens were made of the same batch of 7-series aluminum alloy. The specific specimen specifications are shown in the figure. The relevant data are summarized in Tables 1-3 below.

[0061] Table 1. Statistical analysis of samples before testing

[0062]

[0063] Table 2 Test results of the present invention (time: minutes)

[0064]

[0065] Table 3. Test results using conventional methods (Time: minutes)

[0066]

[0067] As can be seen from Tables 1-3 above, this invention saved a significant amount of clamping and reference setting time in this test, and the processing quality of the sample was significantly improved. The device and application method can complete the processing of the sample with high quality and efficiency. Traditional processing methods rely too much on the skill level of operators, which has a large degree of uncertainty in ensuring quality control and test progress. The efficient positioning processing device and application method of the CNC machining center for C-ring sample of this invention provides an efficient solution for the processing of this sample.

[0068] In this invention, any device for processing C-ring specimens may include the device structure for processing C-ring specimens described in this embodiment. Based on the relevant structure and assembly relationship of the positioning block 3 and the base 1 provided in this embodiment, the device for processing C-ring specimens also includes conventional components such as C-rings, bolts, and clamps. Since these are all prior art, they will not be described in detail here.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An apparatus for processing C-ring specimens, characterized in that, The device includes a base (1), a clamping plate (2), and a positioning block (3). The positioning block (3) is located on the top of the base (1). The clamping plate (2) is connected to or separated from the base (1) through the positioning block (3). The base (1) is connected to or separated from the CNC machine tool. A receiving groove (4) is formed between the clamping plate (2) and the base (1). A C-shaped ring sample is placed in the receiving groove (4). The top of the C-shaped ring sample is connected to the bottom of the clamping plate (2). The bottom and / or outer wall of the C-shaped ring sample are connected to the base (1). The base (1) is a semi-enclosed structure, and the clamping plate (2) is Y-shaped. Specifically, the base (1) includes a support seat (11) and a support seat (12). One end of the support seat (12) is connected to the support seat (11), and the other end of the support seat (12) is connected to or separated from the CNC machine tool. The positioning block (3) is set on the top of the support seat (11) near the end of the support seat (12). The support (11) includes a support block (112), a first support plate (113), and a second support plate (114). One side of the support block (112) is connected to the support (12), and the other side of the support block (112) is connected to the first support plate (113) and the second support plate (114) respectively. The first support plate (113) and the second support plate (114) are arranged perpendicularly. A bolt hole (111) is provided on the side of the support block (112) away from the support (12). The support block (112) is provided with a positioning block (3) on one side near the second support base (12). The support block (112) is connected to the clamping plate (2) through the stud (5) provided in the bolt hole (111) and the positioning block (3). A receiving groove (4) is formed between the clamping plate (2), the support block (112), the first support plate (113) and the second support plate (114). The first support base (11) also includes a drilling clearance groove (115) and a tool clearance groove (116). The positioning block (3) includes a positioning block (31) and a positioning block (32). The bottom of the positioning block (31) is connected to the base (1) through the positioning block (32). The outer side of the positioning block (31) is engaged with the clamping plate (2). Both the positioning block (31) and the positioning block (32) are prisms.

2. The apparatus for processing C-ring specimens according to claim 1, characterized in that, The support base (11) includes a bolt hole (111), which is provided on the support base (11) in a top-to-bottom manner.

3. The apparatus for processing C-ring specimens according to claim 2, characterized in that, The device includes a stud (5) and a nut (51). One end of the stud (5) is connected to or separated from a bolt hole (111). The other end of the stud (5) is detachably connected to the nut (51) and the clamp (2). The inner wall of the nut (51) and the clamp (2) are in contact with the outer wall of the stud (5). The nut (51) is set on the top of the clamp (2) and is used to press the clamp (2) onto the top of the base (1) through the interaction of the nut (51) and the stud (5).

4. The apparatus for processing C-ring specimens according to claim 1, characterized in that, The clamp (2) includes a buffer pad (23) which is disposed at the bottom of the clamp (2).

5. The apparatus for processing C-ring specimens according to claim 3, characterized in that, The clamping plate (2) also includes a clamping plate (21) and a clamping plate (22). One end of the clamping plate (21) is connected to the clamping plate (22), and the other end of the clamping plate (21) is connected to the base (1) through a positioning block (3). The end of the clamping plate (21) near the clamping plate (22) is connected to the base (1) through a stud (5).

6. The apparatus for processing C-ring specimens according to claim 5, characterized in that, The clamping plate (21) includes a first through hole (211) and a second through hole (212). Both the first through hole (211) and the second through hole (212) are disposed through the clamping plate (21). The inner wall of the first through hole (211) is connected to the outer wall of the stud (5), and the inner wall of the second through hole (212) is attached to the outer wall of the positioning block (3).

7. A processing method for an apparatus for processing C-ring specimens, characterized in that, The processing method uses the apparatus for processing C-ring specimens as described in claim 6, and the method includes the following steps: Step 1: Pre-machining of the ring: The blank material is machined into a ring with the required dimensions and surface roughness as specified in the drawing using a CNC machine tool; Step 2: Clamping the ring in the processing device: Place the ring in the base (1) and clamp the clamping plate (2) to the positioning block (3) on the base (1) through the second through hole (212). The clamping plate (2) is set outside the stud (5) through the first through hole (211). Under the action of the nut (51), the clamping plate (2) and the base (1) cooperate to complete the clamping of the ring. Step 3, Translational Machining: The CNC machine tool is connected to the two support seats (12) for one-time sample machining; Step 4, flipping and secondary processing: The CNC machine tool drives the two support seats (12) that are set in a self-centering and positioning manner to obtain the required C-ring sample.

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