Reconditioning process for metal gasket face seal joints

Abstract

The application discloses a rework process of a metal gasket face seal joint, relates to the field of the repairing technology of the metal gasket face seal joint, and can solve the problems of low efficiency and difficult guarantee of repairing quality of the manual polishing and polishing repairing of the metal gasket face seal joint in the prior art. The rework process comprises the following steps: plating polishing material on a sealing end of a standard metal gasket face seal joint, preparing a polishing tool, polishing the polishing tool by the metal gasket face seal joint through a polishing device, forming a polishing groove in the polishing tool, and polishing the metal gasket face seal joint to be repaired through the polishing device and the polishing tool, so as to grind and repair the sealing end of the metal gasket face seal joint to be repaired.

Description

Technical Field

[0001] This application relates to the field of repair technology for metal gasket face seal joints, and specifically to a repair process for metal gasket face seal joints. Background Technology

[0002] Metal gasket face seals are widely used in semiconductor, optoelectronic, and aerospace industries due to their excellent sealing performance and broad application range. They are typically used for sealing connections requiring high purity, high reliability, and high safety, such as in semiconductor manufacturing equipment, vacuum pipelines, and specialty gas delivery lines. Metal gasket face seals achieve efficient sealing by the deformation of the metal gasket under pressure, ensuring a tight fit with the sealing end face. The end faces of these joints are often designed with multiple curved surfaces to increase the effective contact area and optimize stress distribution, thereby improving overall sealing performance.

[0003] Typically, two metal gasket-sealed joints are mated at their sealing ends and sealed using metal gaskets. However, during installation or operation, improper handling such as excessive tightening force, uneven stress, or accidental impacts can cause minor damage and deformation to the sealing surfaces. These minor damages and deformations can severely affect sealing performance, especially in high-pressure or high-vacuum environments, and may even lead to problems such as contamination, leakage, and safety accidents.

[0004] In existing technologies, when the end face of a metal gasket-faced sealing joint is damaged or worn, it is usually necessary to cut and replace it with a new metal gasket-faced sealing joint to maintain its sealing performance. However, this practice significantly increases maintenance costs, especially in large-scale applications. Frequent replacement of parts not only wastes materials and money but also leads to increased equipment downtime, thus affecting overall production efficiency. Some companies choose to use handheld grinders for manual polishing and repair. However, manual handheld grinders are inefficient, especially when dealing with precision surfaces, and the rework speed cannot meet the requirements of industrial production. Secondly, the quality of manual grinding is difficult to guarantee, not only due to surface unevenness and morphology changes caused by human factors, but also because it requires a very high level of skill from the operators. Summary of the Invention

[0005] Therefore, this application provides a repair process for metal gasket surface sealing joints to solve the problems of low efficiency and difficulty in guaranteeing repair quality in the prior art of manually grinding and polishing to repair metal gasket surface sealing joints.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A rework process for a metal gasket-faced sealing joint, wherein the sealing end of the metal gasket-faced sealing joint has multiple continuous annular sealing end faces, and the outer periphery of the multiple annular sealing end faces forms a circumferential sealing surface, characterized by comprising the following steps:

[0008] S1, Abrasive material is plated on the sealing end of the standard metal gasket face sealing joint;

[0009] S2, Prepare the polishing tools, which have polishing surfaces;

[0010] S3, fix the grinding tool on the worktable of the grinding device, and connect the standard metal gasket sealing joint with the sealing end plated with abrasive in step S1 to the working shaft of the grinding device. The metal gasket sealing joint rotates to grind the grinding tool, so that the grinding surface of the grinding tool is ground to form a grinding groove that matches the sealing end of the metal gasket sealing joint. The grinding groove has multiple grinding annular surfaces, and the multiple grinding annular surfaces correspond one-to-one with multiple annular sealing end faces. Non-grinding annular planes and non-grinding circular planes are formed at the groove opening of the grinding groove, respectively. The non-grinding circular plane is located at the center of the grinding surface, and the non-grinding annular plane is located at the edge of the grinding surface.

[0011] S4. Connect the grinding tool to the working shaft of the grinding device, fix the metal gasket face sealing joint to be repaired on the worktable of the grinding device, and control the grinding tool to rotate and approach the sealing end of the metal gasket face sealing joint to be repaired. Multiple grinding ring surfaces of the grinding groove grind multiple annular sealing end faces of the metal gasket face sealing joint to be repaired, so as to grind and repair the sealing end of the metal gasket face sealing joint to be repaired.

[0012] Optionally, the polishing tool includes a polishing column and a connecting column connected to the end face of the polishing column and for connecting to the polishing device. The polishing surface is located on the side of the polishing column away from the connecting column, and the central axis of the polishing column and the central axis of the connecting column are collinear.

[0013] Optionally, the grinding device is a floating spindle grinding machine.

[0014] Optionally, after step S4, after prolonged use, the grinding tool's multiple grinding ring surfaces are ground by the multiple annular sealing end faces of the metal gasket sealing joint to be repaired, which deepens the grinding groove. The non-grinding annular plane of the grinding groove opening approaches or abuts against the circumferential sealing surface of the metal gasket sealing joint to be repaired, and the non-grinding circular plane of the grinding groove opening enters the pipe hole of the metal gasket sealing joint.

[0015] The non-grinding annular plane and non-grinding circular plane of the grinding tool are ground by grinding tools to reduce the depth of the grinding groove, so that a set gap is maintained between the non-grinding annular plane and the circumferential sealing surface, and the non-grinding circular plane is flush with the opening of the pipe hole of the metal gasket sealing joint.

[0016] Optionally, in step S4, the polishing device employs intermittent polishing.

[0017] Optionally, the abrasive is silicon carbide abrasive or diamond abrasive.

[0018] Optionally, the polishing tool is made of a mixture of silicone material and abrasive.

[0019] Optionally, the abrasive is diamond abrasive, silicon carbide abrasive, or alumina abrasive.

[0020] Compared with the prior art, this application has at least the following beneficial effects:

[0021] Minor depressions or protrusions (minor damage) on the annular sealing end face of the metal gasket face sealing joint to be repaired are ground away. In other words, multiple annular sealing end faces of the metal gasket face sealing joint to be repaired are simultaneously ground to the same depth. This process removes the minor damage while maintaining the consistency of multiple annular sealing end faces with the sealing end of a standard metal gasket face sealing joint. Compared to manual grinding in existing technologies, the process described in this application not only shortens the repair time but also improves the quality of the repair. Attached Figure Description

[0022] To more intuitively illustrate the prior art and this application, several exemplary figures are provided below. It should be understood that the specific shapes and structures shown in the figures should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary figures, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0023] Figure 1 This is a schematic diagram of the structure of a metal gasket face sealing joint provided in one embodiment of this application;

[0024] Figure 2 for Figure 1 A cross-sectional view along the aa direction;

[0025] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4This is a schematic diagram of the structure of a polishing tool provided in one embodiment of this application;

[0027] Figure 5 This is a schematic diagram of the structure of a polishing tool after polishing, according to one embodiment of this application.

[0028] Figure 6 for Figure 5 A sectional view along the bb direction;

[0029] Figure 7 for Figure 8 Enlarged view at point B in the middle;

[0030] Figure 8 for Figure 7 Enlarged view at point C;

[0031] Figure 9 This is a schematic diagram of the structure of a grinding tool and a metal gasket sealing joint provided in one embodiment of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Metal gasket face sealing joint; 11. Sealing end; 12. Pipe hole; 111. Annular sealing end face; 112. Circumferential sealing surface; 2. Grinding tool; 21. Grinding post; 211. Grinding surface; 212. Grinding groove; 2121. Grinding annular surface; 213. Non-grinding annular plane; 214. Non-grinding circular plane; 22. Connecting post. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0035] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "comprising," "including," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0036] refer to Figure 1-9This application discloses a repair process for a metal gasket face sealing joint 1. The sealing end 11 of the metal gasket face sealing joint 1 has multiple continuous annular sealing end faces 111. The multiple annular sealing end faces 111 are adjacent to each other in sequence, and some of the multiple annular sealing end faces 111 are planar and some are curved. The multiple annular sealing end faces 111 have the same central axis, and the central axis is collinear with the central axis of the pipe hole 12 of the metal gasket face sealing joint 1. A circumferential sealing surface 112 is formed on the outer periphery of the multiple annular sealing end faces 111. The circumferential sealing surface 112 is continuously formed with the outermost annular sealing end face 111 of the multiple annular sealing end faces 111. The circumferential sealing surface 112 generally does not wear, so it does not need to be ground and repaired.

[0037] The rework process includes the following steps:

[0038] S1, firstly, the sealing end 11 of the standard metal gasket face sealing joint 1 is cleaned, and then the sealing end 11 of the standard metal gasket face sealing joint 1 is plated with abrasive by physical vapor deposition or electroplating technology; in some embodiments, the entire surface of the metal gasket face sealing joint 1 can be plated with abrasive.

[0039] S2, Prepare polishing tool 2, polishing tool 2 has polishing surface 211;

[0040] S3, fix the grinding tool 2 on the worktable of the grinding device, and connect the standard metal gasket sealing joint 1 with abrasive material plated on the sealing end 11 in step S1 to the working shaft of the grinding device. The metal gasket sealing joint 1 rotates to grind the grinding tool 2, so that the grinding surface 211 of the grinding tool 2 is ground to form a grinding groove 212 that matches the sealing end 11 of the metal gasket sealing joint 1. The grinding groove 212 has multiple grinding annular surfaces 2121 (not shown in the figure). The multiple grinding annular surfaces 2121 correspond one-to-one with multiple annular sealing end surfaces 111. That is, the multiple grinding annular surfaces 2121 and the multiple annular sealing end surfaces 111 form a shape with matching male and female morphological features. Non-grinding annular plane 213 and non-grinding circular plane 214 are formed at the groove opening of the grinding groove 212, respectively. The non-grinding circular plane 214 is located at the center of the grinding surface 211, and the non-grinding annular plane 213 is located at the edge of the grinding surface 211.

[0041] S4, connect the grinding tool 2 to the working shaft of the grinding device, fix the metal gasket face sealing joint 1 to be repaired on the worktable of the grinding device, and control the grinding tool 2 to rotate and approach the sealing end 11 of the metal gasket face sealing joint 1 to be repaired. The multiple grinding ring surfaces 2121 of the grinding groove 212 grind the multiple annular sealing end faces 111 of the metal gasket face sealing joint 1 to be repaired, so as to grind and repair the sealing end 11 of the metal gasket face sealing joint 1 to be repaired, so that the small depressions, small protrusions or deformations (minor damage) on the annular sealing end faces 111 of the sealing end 11 of the metal gasket face sealing joint 1 to be repaired are ground away. That is, the multiple annular sealing end faces 111 of the metal gasket face sealing joint 1 to be repaired are ground away simultaneously with the same grinding depth. In this way, while grinding away the minor damage, the consistency of the multiple annular sealing end faces 111 with the sealing end 11 of the standard metal gasket face sealing joint 1 is maintained. Compared to the existing technology that relies on manual polishing, the process involved in this application not only shortens the rework time but also improves the quality of the rework.

[0042] Among them, the metal gasket face sealing joint 1 is the prior art, and the specific shape and structure of the multiple annular sealing end faces 111 and the circumferential sealing surface 112 of the metal gasket face sealing joint 1 will not be described in detail.

[0043] The grinding tool 2 includes a grinding column 21 and a connecting column 22 connected to the end face of the grinding column 21 and used for connecting to the grinding device. The grinding surface 211 is located on the side of the grinding column 21 away from the connecting column 22. The central axis of the grinding column 21 and the central axis of the connecting column 22 are collinear.

[0044] The grinding device is a floating spindle grinder. The floating spindle grinder is characterized by its spindle's ability to adjust displacement in both the axial and radial directions. In actual operation, when installing the metal gasket face seal joint 1 to be repaired and the grinding tool 2, the irregularity of the grinding tool 2's shape or deviation in positioning accuracy may cause the tool and joint surface to not be perfectly aligned. The floating spindle can adaptively adjust according to the actual position of the workpiece, thereby eliminating this positional deviation and ensuring that the grinding tool 2 maintains a suitable contact angle and position with the annular sealing end face 111 to be repaired throughout the grinding process. Since the sealing end 11 of the metal gasket face seal joint 1 typically has multiple curved surfaces, this floating characteristic ensures that the grinding column 21 always fits tightly against each annular sealing end face 111.

[0045] After step S4, after prolonged use, the multiple grinding annular surfaces 2121 of the grinding tool 2 are ground by the multiple annular sealing end faces 111 of the metal gasket sealing joint 1 to be repaired, thus deepening the grinding groove 212. As a result, the non-grinding annular plane 213 at the opening of the grinding groove 212 will approach or abut against the circumferential sealing surface 112 of the metal gasket sealing joint 1 to be repaired. The circumferential sealing surface 112 does not require grinding, especially when the non-grinding annular plane 213 abuts against the circumferential sealing surface 112. If the cover 112 is not properly polished, unnecessary grinding will be performed on the circumferential sealing surface 112. This will not only have an excessive impact on the entire polished surface 211, but also have a related impact on the polishing groove 212. In addition, the non-grinding circular plane 214 at the opening of the polishing groove 212 will also enter the pipe hole 12 of the metal gasket surface sealing joint 1 due to excessive grinding. The part that enters the pipe hole 12 will contact the hole wall of the pipe hole 12, forming additional friction, which may result in excessive grinding of the pipe hole 12 of the metal gasket surface sealing joint 1.

[0046] Therefore, by grinding the non-grinding annular plane 213 and non-grinding circular plane 214 of the grinding tool 2, the depth of the grinding groove 212 is reduced so that a set gap is maintained between the non-grinding annular plane 213 and the circumferential sealing surface 112, and the non-grinding circular plane 214 is flush with the opening of the pipe hole 12 of the metal gasket sealing joint 1, so that it restores the structural state of multiple grinding annular surfaces 2121 and multiple annular sealing end faces 111 that are adapted to each other.

[0047] Among them, the grinding tool can be a surface grinding wheel, etc.

[0048] It should be noted that, due to the structural characteristics of the multiple annular sealing end faces 111 of the metal gasket sealing joint 1, the non-grinding circular plane 214 of the grinding tool 2 is higher than the non-grinding annular plane 213.

[0049] In some embodiments, the grinding tool 2 may also experience excessive wear on one side due to radial misalignment of its own or the metal gasket sealing joint 1 to be repaired on the grinding apparatus, particularly radial misalignment of the grinding tool 2 or the metal gasket sealing joint 1 to be repaired. In such cases, it is necessary to appropriately grind and reduce the entire grinding surface 211 of the grinding tool 2 using a grinding tool, and then re-grind and correct the grinding tool 2 in step S3 to correct the grinding groove 212 to a standard grinding groove. In this way, the grinding tool 2 can be reused multiple times, significantly reducing the cost of material and tool replacement.

[0050] In step S4, the polishing device employs intermittent polishing. Intermittent polishing helps to effectively control temperature rise during the polishing process, avoiding the problem of high temperature accumulation caused by continuous grinding. High temperatures can cause changes in the physical properties of the material of the metal gasket sealing joint 1, and can also cause changes in the material properties of the polishing tool 2, affecting or eliminating the polishing effect.

[0051] The abrasive is either silicon carbide or diamond.

[0052] The grinding tool 2 is made of a mixture of silicone material and abrasive. The abrasive is diamond, silicon carbide, or alumina. The silicone material possesses certain flexible deformation properties. During the repair grinding process, if there is a radial deviation between the metal gasket sealing joint 1 to be repaired and the grinding groove 212 of the grinding tool 2, the silicone material can adaptably deform elastically during grinding, effectively compensating for this deviation. This flexible deformation characteristic allows the grinding tool 2 to better match the sealing end 11 of the metal gasket sealing joint 1, ensuring that the grinding groove 212 and the annular sealing end face 111 of the joint to be repaired are always in close contact, avoiding uneven grinding due to deviation. Simultaneously, the abrasive (diamond, silicon carbide, or alumina) in the grinding tool 2 ensures the grinding effect during the grinding process. The combination of the deformation properties of the silicone material and the high grinding performance of the abrasive gives the grinding tool 2 both good adaptability and sufficient grinding effect during the repair process.

[0053] In some embodiments, the polishing tool 2 may also be made of other materials such as rubber and abrasive.

[0054] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

[0055] The present application has been described in a relatively specific and detailed manner above through general descriptions and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.

Claims

1. A rework process for a metal gasket-faced sealing joint, wherein the sealing end of the metal gasket-faced sealing joint has multiple continuous annular sealing end faces, and the outer peripheral sides of the multiple annular sealing end faces form circumferential sealing surfaces, characterized in that, Includes the following steps: S1, Abrasive material is plated on the sealing end of the standard metal gasket face sealing joint; S2, Prepare the polishing tools, which have polishing surfaces; S3, fix the grinding tool on the worktable of the grinding device, and connect the standard metal gasket sealing joint with the sealing end plated with abrasive in step S1 to the working shaft of the grinding device. The metal gasket sealing joint rotates to grind the grinding tool, so that the grinding surface of the grinding tool is ground to form a grinding groove that matches the sealing end of the metal gasket sealing joint. The grinding groove has multiple grinding annular surfaces, and the multiple grinding annular surfaces correspond one-to-one with multiple annular sealing end faces. Non-grinding annular planes and non-grinding circular planes are formed at the groove opening of the grinding groove, respectively. The non-grinding circular plane is located at the center of the grinding surface, and the non-grinding annular plane is located at the edge of the grinding surface. S4. Connect the grinding tool to the working shaft of the grinding device, fix the metal gasket face sealing joint to be repaired on the worktable of the grinding device, and control the grinding tool to rotate and approach the sealing end of the metal gasket face sealing joint to be repaired. Multiple grinding ring surfaces of the grinding groove grind multiple annular sealing end faces of the metal gasket face sealing joint to be repaired, so as to grind and repair the sealing end of the metal gasket face sealing joint to be repaired.

2. The rework process according to claim 1, characterized in that, The polishing tool includes a polishing column and a connecting column connected to the end face of the polishing column and used for connecting to the polishing device. The polishing surface is located on the side of the polishing column away from the connecting column, and the central axis of the polishing column and the central axis of the connecting column are collinear.

3. The rework process according to claim 1, characterized in that, The grinding device is a floating spindle grinding machine.

4. The rework process according to claim 1, characterized in that, After step S4, after prolonged use, the grinding tool's multiple grinding ring surfaces are ground by the multiple annular sealing end faces of the metal gasket sealing joint to be repaired, which increases the depth of the grinding groove. The non-grinding annular plane of the groove opening approaches or abuts against the circumferential sealing surface of the metal gasket sealing joint to be repaired, and the non-grinding circular plane of the groove opening enters the pipe hole of the metal gasket sealing joint. The non-grinding annular plane and non-grinding circular plane of the grinding tool are ground by grinding tools to reduce the depth of the grinding groove, so that a set gap is maintained between the non-grinding annular plane and the circumferential sealing surface, and the non-grinding circular plane is flush with the opening of the pipe hole of the metal gasket sealing joint.

5. The rework process according to claim 1 or 3, characterized in that, In step S4, the polishing device uses intermittent polishing.

6. The rework process according to claim 1, characterized in that, The abrasive is silicon carbide abrasive or diamond abrasive.

7. The rework process according to claim 1 or 2, characterized in that, The polishing tool is made of a mixture of silicone material and abrasive.

8. The rework process according to claim 7, characterized in that, The abrasive material is diamond abrasive, silicon carbide abrasive, or alumina abrasive.

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