A grinding device for processing open elastic ring parts

Abstract

The utility model belongs to the technical field of machining, especially a kind of grinding device for opening elastic ring part processing, the device includes two parts for ring hole finish machining grinding assembly and for ring outer circle finish machining grinding assembly;Wherein for ring hole finish machining grinding assembly includes tail cone, main body, sleeve, nut, stopper I, adjusting washer I, adjusting washer II, stopper II;Ring outer circle finish machining grinding assembly includes mandrel, adjusting washer III, adjusting washer IV, adjusting washer V, stopper III, nut, the device proposed in the utility model can conveniently realize the quick conversion of each group of ring part from hole finish machining to outer circle finish machining on workbench, without grinding device main part repeatedly disassembled from machine tool with each group of ring part processing, not only reliably ensure that each group of ring part opening size and its hole and outer circle form position precision requirement, and worker operation is convenient and fast, improves opening elastic ring part processing quality and production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of machining technology, and in particular to a grinding device for machining open elastic expansion ring parts. Background Technology

[0002] An open-end elastic expansion ring is a functional component used in channel disc valves. It is installed on the disc and provides a seal in the channel when the valve is closed. Figure 1 The typical part drawing shows that the material is generally stainless steel, with a heat treatment hardness ≥345HV. The thickness L2 is generally designed to be 0.8~1.5mm, which is thin. The outer circle φd has a dimensional accuracy of r7, a surface roughness requirement of Ra0.4, and a roundness tolerance of 0.02mm. The inner hole φD has a dimensional accuracy of H10 and a surface roughness requirement of Ra0.8. Under the condition of meeting the closing dimension L1+0.10, the coaxiality tolerance of the outer circle φd relative to the inner hole φD is φ0.02mm, thus ensuring that the part can achieve its sealing function under certain tension. The part is characterized by high dimensional accuracy, strict geometric tolerances, and high machining difficulty.

[0003] Among the existing publicly available technologies, patent CN216912363U discloses a processing equipment for oil sealing expansion rings, belonging to the field of oil sealing expansion ring technology. It solves the problem of how to process oil sealing expansion rings used in high-speed and high-temperature applications. This processing equipment comprises three parts: an inner hole processing and installation equipment for installing the oil sealing expansion ring, an inner hole processing equipment for machining the inner hole of the oil sealing expansion ring, and an outer circle processing equipment for machining the outer circle of the oil sealing expansion ring. It features reusability, high efficiency, low processing cost, and a simple and practical process.

[0004] However, this method has the following drawbacks: Firstly, this process equipment is suitable for machining oil sealing rings on a lathe using turning methods. This machining method can meet the process requirements for machining rings made of aluminum bronze and other metal materials; however, it is difficult to meet the process requirements for machining open elastic rings made of stainless steel and other metal materials with high precision requirements, as mentioned in the background technology. Secondly, after machining a set of expansion ring inner holes using the internal hole machining structure, the first and second machining bodies need to be removed from the lathe while still in the installed state. After the external diameter machining structure is installed, the first and second machining bodies are removed again before the next set of expansion ring parts can be installed and machined. This structure is acceptable on a lathe, but it is inconvenient to operate and time-consuming and labor-intensive when used for grinding. Utility Model Content

[0005] The purpose of this utility model is: In order to overcome the shortcomings of the existing technology of machining expansion ring parts on a lathe using expansion ring process equipment, the purpose of this utility model is to provide a grinding device for group machining of open elastic expansion ring parts that is lightweight, easy to operate, has high machining accuracy, fast changeover speed, and high production efficiency.

[0006] The technical solution of this utility model: A grinding apparatus for machining open elastic expansion ring parts, comprising two parts: a grinding assembly for finishing the inner hole of the expansion ring and a grinding assembly for finishing the outer diameter of the expansion ring. The grinding assembly for precision machining of the inner hole of the expansion ring includes a tail cone, a main body, a sleeve, a nut, a stop block I, and a stop block II. The tail cone is fixed together with the left end connecting hole of the main body after being press-fitted. The main body also has a mounting hole with a large diameter. The sleeve is set in the mounting hole of the main body. The left and right ends of the sleeve are respectively fitted with stop blocks I and stop blocks II to limit the two sides of the expansion ring inserted into the inner hole of the sleeve. The nut is fitted with the right end of the main body to axially limit stop block II, thereby realizing the axial pressing and fixing of the expansion ring. The grinding assembly for precision machining of the outer diameter of the expansion ring includes a mandrel, a stop block III, and a nut. The mandrel is a stepped shaft with a smaller diameter section at the left end and a middle diameter section for mounting the expansion ring. The stop block III is mounted on the root of the smaller diameter section of the mandrel to limit the left side of the expansion ring, while the right side of the expansion ring is limited by the root of the larger diameter section of the mandrel. The nut is fixed to the smaller diameter section of the mandrel to achieve axial compression and fixation of the expansion ring.

[0007] Furthermore, multiple adjusting shims are provided on both sides of the expansion ring to ensure that stop blocks I, II, and III can reliably press the expansion ring parts together.

[0008] Furthermore, the number of adjusting shims used is determined based on the thickness of the expansion ring parts and the number of parts processed in each group.

[0009] Furthermore, multiple expansion ring assemblies can be placed inside the expansion ring inner hole finishing grinding assembly and the expansion ring outer circle finishing grinding assembly, with the opening positions of adjacent expansion rings staggered from each other.

[0010] Furthermore, the tail cone and the main body are fitted together by pressure and then welded together. The main body mounting hole is precision ground after the main body and the tail cone are welded together to ensure their coaxiality requirements.

[0011] Furthermore, both the stop block I and the stop block II are fitted with the sleeve connecting hole with a clearance, and their inner diameter is slightly larger than the inner diameter of the expansion ring part in the closed state.

[0012] Furthermore, the left and right ends of the sleeve are configured with stepped structures to match the stepped structures of stop block I and stop block II.

[0013] Furthermore, the outer diameter of the stop block III is smaller than the outer diameter of the expansion ring part to avoid interference from the grinding wheel during grinding.

[0014] Technical effects of this utility model: By adopting the above technical solution, during the processing of each group of expansion rings using the inner hole finishing grinding device and the outer circle finishing grinding device, a sleeve part that can be quickly installed and removed is set up to facilitate the rapid conversion of each group of expansion ring parts from inner hole finishing to outer circle finishing on the worktable. There is no need for the main body of the grinding device to be repeatedly disassembled from the machine tool during the processing of each group of expansion ring parts. This not only reliably ensures the opening size of each group of expansion ring parts and the positional accuracy requirements of the inner hole and outer circle, but also makes the operation convenient and quick for workers, improving the processing quality and production efficiency of the open elastic expansion ring parts. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a typical structure of a part with an expanding ring to be processed.

[0017] Figure 2 This is a schematic diagram of a typical structure of a rough-machined expansion ring part in a free state.

[0018] Figure 3 This is a schematic diagram of a typical structure of the inner hole of a precision-machined expansion ring part in the closed state.

[0019] Figure 4 This is a schematic diagram of a typical structure of the outer circle of a precision-machined expansion ring part in the closed state.

[0020] Figure 5 This is a schematic diagram of the grinding device for precision machining of the inner hole of an expansion ring part according to this utility model: 1-tail cone, 2-body, 3-sleeve, 4-expansion ring part, 5-nut, 6-stop block I, 7-adjusting shim I, 8-adjusting shim II, 9-stop block II.

[0021] Figure 6 This is a schematic diagram of the grinding device for precision machining of the outer diameter of expansion ring parts according to this utility model: Among them, 10-mandrel, 11-adjusting shim III, 12-adjusting shim IV, 13-adjusting shim V, 14-stop block III, 15-nut. Detailed Implementation

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings or specific implementation examples. It should be noted that some (but not all) of the disclosed examples are shown in the drawings. In fact, many different examples can be described, and these examples should not be construed as limited to the examples set forth herein. Rather, these examples are described to better demonstrate the positive effects of this utility model, and all aspects not detailed herein are considered to be well-known or conventional techniques in the art.

[0023] See appendix Figures 1-5 The present invention relates to a grinding device for machining open elastic expansion ring parts. This device comprises two parts: a grinding device for finishing the inner hole of the expansion ring and a grinding device for finishing the outer diameter of the expansion ring. During the machining of each set of expansion ring parts, this grinding device achieves rapid conversion from inner hole finishing to outer diameter finishing on the worktable through the setting of a sleeve part. This eliminates the need for repeated disassembly and reassembly of the main body of the grinding device from the machine tool with each set of expansion ring parts. This not only reliably ensures the opening size of each set of expansion rings and the positional accuracy requirements of its inner hole and outer diameter, but also makes operation convenient and quick for workers. It is a grinding device with a lightweight structure, high machining accuracy, fast changeover speed, and high production efficiency.

[0024] The grinding apparatus designed above for machining open elastic expansion ring parts includes two parts: a grinding apparatus for finishing the inner hole of the expansion ring and a grinding apparatus for finishing the outer diameter of the expansion ring. The grinding apparatus for finishing the inner hole of the expansion ring is as follows: Figure 5 As shown, it includes a tail cone, a main body, a sleeve, a nut, a stop block I, an adjusting shim I, an adjusting shim II, and a stop block II. The tail cone is press-fitted to the main body's connecting hole and then welded together. The sleeve is fitted with the main body's φD1 mounting hole with a clearance fit. Stop blocks I and II are both fitted with the sleeve's connecting hole with a clearance fit. Adjusting shims I and II are both fitted with the sleeve's connecting hole with a clearance fit. The nut is threaded to the main body. Its outer diameter precision grinding device is as follows: Figure 6 As shown, it includes a mandrel, adjusting shims III, IV, V, a stop block III, and a nut. The mandrel and the connecting holes of adjusting shims III, IV, and V are all clearance fits. The mandrel and the connecting hole of the stop block III are also clearance fits. The mandrel and the nut are threadedly fitted.

[0025] As designed above, when using the inner hole precision grinding device for the expansion ring for the first time, the mounting hole φD1 of the main body needs to be precision ground on a grinding machine after the main body and the tail cone are welded together to ensure their coaxiality requirements; the sleeve φD2 hole is manufactured with a certain machining allowance, and is used according to... Figure 3The outer diameter of the expansion ring part φd2 in the closed state shown is machined to ensure that the opening size L1 after the part is installed into the sleeve φD2 hole meets the process requirements; the inner diameter of the stop block I and stop block II should be greater than Figure 3 The inner diameter φD of the expansion ring part in the closed state shown should be greater than the inner diameter of the adjusting shims I and II. Figure 3 The inner diameter φD of the expansion ring part in the closed state shown is such that the inner diameter of the nut should be greater than... Figure 3 The inner hole size φD of the expansion ring part in the closed state is shown to avoid grinding wheel interference when grinding the inner hole of the expansion ring part.

[0026] As designed above, after the grinding device for finishing the inner hole of the expansion ring is successfully debugged, it is used by installing the grinding device onto an internal grinding machine. The tail cone of the grinding device mates with the taper hole of the grinding machine and is tightened by a screw. On the worktable, first connect the stop block II to the sleeve, then install the adjusting shim II, the expansion ring, and the adjusting shim I into the sleeve in sequence. Note that when installing the expansion ring, the opening positions should be staggered to ensure that the grinding wheel is evenly stressed when grinding the inner hole. Then, install the stop block I and visually check that the pressing surface of the stop block I is in good contact with one end face of the adjusting shim, and that the other step end faces do not interfere. Finally, install the sleeve, stop block, and adjusting shim with the expansion ring parts installed into the φD1 mounting hole of the main body of the grinding device. Tighten the nut with a wrench to secure the parts and complete the parts installation. Start the machine tool to finish the inner hole of the expansion ring parts. After the φD hole of the expansion ring part is machined, loosen the nut with a wrench and remove it. Keep the sleeve, stop block, and adjusting washer of the machined expansion ring part in the installed state and take them out from the φD1 mounting hole of the main body of this grinding device and place them on the worktable. Then remove the stop block I, adjusting washer I, stop block II, and adjusting washer II in sequence, leaving only the sleeve and expansion ring part in the installed state, ready to be installed into the expansion ring outer diameter finishing grinding device.

[0027] As designed above, when using a precision grinding device for finishing the inner hole of an expansion ring to finish the φD hole, while ensuring its dimensional tolerances, it is necessary to... Figure 6 The outer circle of the mandrel φd2 described herein is fitted with a machining clearance to reduce the clearance positioning error and ensure the high precision requirement of the coaxiality of the parts.

[0028] The grinding device for precision machining of the outer diameter of the expansion ring, as designed above, is as follows: Figure 6 As shown, the root of the outer circle of the mandrel φd2 should be cleaned to ensure good contact between the end face of the mandrel step and the end face of the adjusting shim III. The outer diameters of the adjusting shims III, IV, and V should all be smaller than the outer diameter φd of the expansion ring part. The outer diameter of the stop block III should also be smaller than the outer diameter φd of the expansion ring part to avoid interference from the grinding wheel during grinding. The number of adjusting shims is determined independently based on the thickness and quantity of each group of expansion ring parts being processed.

[0029] As designed above, when using the expansion ring outer diameter precision grinding device, the operator first installs the adjusting shim Ⅲ on the mandrel on the worktable, then inserts the mandrel into the pre-machined expansion ring part φD hole, and then installs the adjusting shim Ⅳ, adjusting shim Ⅴ, and stop block Ⅲ in sequence. Finally, the operator tightens the nut with a wrench. The clamping force is transmitted to the end face of the expansion ring part through the stop block Ⅲ and adjusting shims to secure the part. At this time, the operator must ensure that the part is pressed tightly and confirm that the elastic expansion ring will not loosen and the opening size will not change before removing the sleeve used in the above-mentioned inner hole precision grinding device.

[0030] Example 1: Figure 2 The diagram shows a rough machining structure of an open expansion ring in a free state. φd1 is the outer diameter, φD1 is the inner diameter, and L2 is the opening size at φd0. Figure 3 The diagram shows the internal hole structure of the opening expansion ring in the closed state after precision machining. φd2 is the outer circle dimension, φD is the inner hole dimension, and L1 is the opening dimension. Figure 4 The diagram shows the outer diameter of the precision machining of the opening expansion ring in the closed state. φd is the outer diameter, φD is the inner diameter, and L1 is the opening size. The purpose of this invention is to achieve high-quality and efficient group precision machining of the inner hole and outer circle of an elastic expansion ring part while shrinking the opening size of the expansion ring from L2 to L1 and keeping the L1 size unchanged, thus ensuring the technical requirements such as the dimensions, surface roughness, and geometric tolerances of the φD inner hole and φd outer circle. The specific implementation method is as follows: A grinding apparatus for machining open-end expansion ring parts comprises two parts: a grinding apparatus for finishing the inner hole of the expansion ring and a grinding apparatus for finishing the outer diameter of the expansion ring. The grinding apparatus for finishing the inner hole of the expansion ring is as follows: Figure 5 As shown, it includes a tail cone 1, a main body 2, a sleeve 3, a nut 5, a stop block 6, an adjusting shim 7, an adjusting shim 8, and a stop block 9. The tail cone 1 and the main body 2 are press-fitted together and then welded. The φD1 mounting hole of the main body 2 is precision ground after the main body 2 and the tail cone 1 are welded together to ensure their coaxiality requirements. The sleeve 3 is fitted with the φD1 mounting hole of the main body 2 with a clearance positioning fit. The φD2 hole of the sleeve 3 is manufactured with a certain machining allowance, which is used according to... Figure 3 The outer diameter of the expansion ring part φd2 in the closed state shown is machined to ensure that the opening size L1 of the part after installation into the φD2 hole of the sleeve 3 meets the process requirements. The stop blocks 6 and 9 are both clearance-fitted with the connecting hole of the sleeve 3, and their inner diameters should be greater than [missing information]. Figure 3 The inner diameter φD of the expansion ring part in the closed state is shown to avoid grinding wheel interference when grinding the inner diameter of the expansion ring part. The adjusting shims 7 and 8 are both fitted with the connecting hole of the sleeve 3 with clearance positioning, and their inner diameter should be greater than φD. Figure 3The inner diameter φD of the expansion ring part in the closed state is shown to avoid grinding wheel interference during grinding of the inner diameter of the expansion ring part. The number of adjusting shims used is determined according to the thickness of the expansion ring part and the number of parts processed in each group, to ensure that the stop block 6 and stop block 9 can reliably clamp the expansion ring part. The nut 5 is threaded to the body 2 and contacts the end face of the stop block 6. When the expansion ring part is installed into the sleeve 3, rotating the nut 5 transmits the clamping force to the end face of the expansion ring part through the stop block 6 and adjusting shims 7, thereby achieving clamping of the part. The inner diameter of the nut 5 should be greater than φD. Figure 3 The inner hole dimension φD of the expansion ring part in the closed state is shown to avoid grinding wheel interference during the grinding of the inner hole of the expansion ring part. After the initial debugging of the grinding equipment for the finishing of the inner hole of the expansion ring part is qualified, it can be put into production. The specific operating steps are as follows: The grinding device is installed on an internal grinding machine. The tail cone 1 of the grinding device mates with the tapered hole of the grinding machine and is tightened by a screw. On the worktable, first connect the stop block 9 to the sleeve 3, then install the adjusting shim 8, the expansion ring 4, and the adjusting shim 7 into the sleeve 3 in sequence. Note that when installing the expansion ring 4, the opening positions should be staggered to ensure uniform force when the grinding wheel grinds the internal hole. Then, install the stop block 6 and visually check that the pressing surface of the stop block 6 and the end face of the adjusting shim 7 are in good contact and that the end faces of the other steps do not interfere. Finally, with the sleeve 3, stop blocks 6 and 9, and adjusting shims 7 and 8 installed, the entire assembly is installed into the φD1 mounting hole of the main body 2 of the grinding device. Tighten the nut 5 with a wrench to secure the parts. Start the machine tool to perform finishing machining of the internal hole of the expansion ring. When finishing the φD hole of the expansion ring, while ensuring its dimensional tolerance, it is necessary to... Figure 6 The outer diameter of the mandrel 10 described herein is fitted with a machining clearance to reduce the positioning error of the clearance and ensure the high precision requirement of the coaxiality of the parts. After the φD hole of the expansion ring part is machined, the nut 5 is loosened and removed with a wrench. The sleeve 3, blocks 6 and 9, and adjusting washers 7 and 8 of the machined expansion ring part are taken out of the φD1 mounting hole of the main body 2 of this grinding device while still in the installation state and placed on the worktable. Then, blocks 6, adjusting washers 7, blocks 9, and adjusting washers 8 are removed in sequence, leaving only the sleeve 3 and the expansion ring part in the installation state, ready to be installed into the expansion ring outer diameter finishing grinding device.

[0031] A grinding apparatus for machining open-ended expansion ring parts, wherein the grinding apparatus for finishing the outer diameter of the expansion ring is as follows: Figure 6As shown, it includes a mandrel 10, adjusting shims 11, 12, and 13, a stop block 14, and a nut 15. The root of the outer diameter φd2 of the mandrel 10 should be cleaned to ensure good contact between the stepped end face of the mandrel and the end face of the adjusting shim 11. The connecting holes of the mandrel 10 and the adjusting shims 11, 12, and 13 are all clearance fits. The connecting hole of the mandrel 10 and the stop block 14 is also a clearance fit. The mandrel 10 and the nut 15 are threaded. The outer diameters of the adjusting shims 11, 12, and 13 should all be smaller than the outer diameter φd of the expansion ring part. The number of adjusting shims 11, 12, and 13 is determined based on the thickness and quantity of each group of processed expansion ring parts. The outer diameter of the stop block 14 should be smaller than the outer diameter φd of the expansion ring part. In use, the operator first installs the adjusting shim 11 on the mandrel on the worktable. Then, the mandrel 10 is inserted into the pre-machined φD hole of the expansion ring part. Next, adjusting shims 12, 13, and 14 are installed in sequence. Finally, the nut 15 is tightened with a wrench. The clamping force is transmitted to the end face of the expansion ring part through the 14, 13, and 12 to secure the part. At this time, the operator must ensure that the part is tightly pressed and confirm that the open elastic expansion ring will not loosen and the opening size will not change. Then, the sleeve 3 used in the inner hole finishing grinding device is removed. After the open elastic expansion ring is installed on the worktable, the operator can clamp the outer diameter finishing grinding device onto the outer diameter grinding machine through the center and start the machine to perform finishing of the outer diameter of the expansion ring part. After the outer diameter is measured to be within acceptable limits using a micrometer on the machine tool, the outer diameter finishing grinding device is removed from the machine tool. The nut 15 is loosened with a wrench, and the stop block 14, adjusting shims 13 and 12 are removed in sequence. The expansion ring parts are then removed, cleaned, and placed in the product box before the next set of expansion ring parts is produced.

[0032] Using the above technical solution, a grinding device for machining open elastic expansion ring parts includes a grinding device for finishing the inner hole of the expansion ring and a grinding device for finishing the outer circle of the expansion ring. During use, by setting a sleeve part that can be quickly loaded and unloaded, the conversion from finishing the inner hole to finishing the outer circle of the open elastic expansion ring parts on the worktable is very convenient. There is no need to repeatedly disassemble the main body of the grinding device from the machine tool with each set of expansion ring parts. This not only reliably ensures the opening size of each set of expansion rings and the positional accuracy requirements of the inner hole and outer circle, but also makes the operation convenient and quick for workers, improving the machining quality and production efficiency of the parts.

[0033] In this embodiment, when the outer diameter and inner diameter of expansion ring parts of the same family have different specifications and dimensions, the following can be done as needed: Figure 5 , Figure 6 As shown, by using this grinding device, the group grinding device can be designed and manufactured by replacing the sleeve 3 and the mandrel 10 and the corresponding adjustment shims and stops, thereby realizing the rapid changeover of open elastic expansion ring parts of different specifications.

[0034] The above specific embodiments or examples are only used to explain the technical solutions of this utility model and are not intended to limit this application. Parts not described in detail are considered to be conventional technical means or common knowledge in the field. It can be understood by those skilled in the art that, based on the design concept of this application, adaptive modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications, equivalent substitutions, and adaptive improvements do not depart from the technical essence of this utility model and should all be covered within the protection scope of this application.

Claims

1. A grinding apparatus for machining open elastic expansion ring parts, characterized in that, It consists of two parts: a grinding assembly for finishing the inner hole of the expansion ring and a grinding assembly for finishing the outer diameter of the expansion ring. The grinding assembly for precision machining of the inner hole of the expansion ring includes a tail cone, a main body, a sleeve, a nut, a stop block I, and a stop block II. The tail cone is fixed together with the left end connecting hole of the main body after being press-fitted. The main body also has a mounting hole with a large diameter. The sleeve is set in the mounting hole of the main body. The left and right ends of the sleeve are respectively fitted with stop blocks I and stop blocks II to limit the two sides of the expansion ring inserted into the inner hole of the sleeve. The nut is fitted with the right end of the main body to axially limit stop block II, thereby realizing the axial pressing and fixing of the expansion ring. The grinding assembly for precision machining of the outer diameter of the expansion ring includes a mandrel, a stop block III, and a nut. The mandrel is a stepped shaft with a smaller diameter section at the left end and a middle diameter section for mounting the expansion ring. The stop block III is mounted on the root of the smaller diameter section of the mandrel to limit the left side of the expansion ring, while the right side of the expansion ring is limited by the root of the larger diameter section of the mandrel. The nut is fixed to the smaller diameter section of the mandrel to achieve axial compression and fixation of the expansion ring.

2. The grinding apparatus for machining open elastic expansion ring parts as described in claim 1, characterized in that, Multiple adjusting shims are also provided on both sides of the expansion ring to ensure that the stop blocks I, II, and III can reliably press the expansion ring parts together.

3. A grinding apparatus for machining open elastic expansion ring parts as described in claim 2, characterized in that, The number of adjusting shims used is determined based on the thickness of the expansion ring parts and the number of parts processed in each group.

4. A grinding apparatus for machining open elastic expansion ring parts as described in claim 1, characterized in that, Multiple expansion ring assemblies can be placed inside the expansion ring inner hole finishing grinding assembly and the expansion ring outer circle finishing grinding assembly, with the opening positions of adjacent expansion rings staggered from each other.

5. A grinding apparatus for machining open elastic expansion ring parts as described in claim 1, characterized in that, The tail cone and the main body are fitted together by pressure and then welded together. The main body mounting hole is precision ground after the main body and the tail cone are welded together to ensure their coaxiality requirements.

6. A grinding apparatus for machining open elastic expansion ring parts as described in claim 1, characterized in that, Both the stop block I and the stop block II are positioned and fitted with the sleeve connection hole with a gap, and their inner diameter is slightly larger than the inner diameter of the expansion ring part in the closed state.

7. A grinding apparatus for machining open elastic expansion ring parts as described in claim 1 or 6, characterized in that, The left and right ends of the sleeve are set with stepped structures to match the stepped structures of stop block I and stop block II.

8. A grinding apparatus for machining open elastic expansion ring parts as described in claim 1, characterized in that, The outer diameter of the stop block III is smaller than the outer diameter of the expansion ring part.

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