A processing method and processing device of sealing expansion ring

Abstract

A processing method and a processing device for a sealing expansion ring, belonging to the field of expansion ring production technology. The method is as follows: subjecting the production raw materials to aging heat treatment; grinding the two end faces and the outer diameter; cutting a Z-shaped opening on the outer wall; subjecting the opening state to heat treatment finalization; subjecting the two end faces to grinding after calibrating the opening size; subjecting the outer diameter to grinding processing; subjecting the inner diameter to grinding processing; subjecting the two end faces to grinding again after calibrating the opening size; and subjecting the leakage amount to leakage testing by means of a leakage measurement device. The present invention uses a gasket to fix the axial opening size of the expansion ring, and then performs rough grinding and fine grinding, so as to accurately control the processing process of the expansion ring, and ensure that the total thickness and axial opening size of the expansion ring meet the requirements of the parts at the same time. In addition, after the grinding treatment after heat treatment finalization, the leakage amount of the sealing expansion ring meets the final use performance, and the yield and performance of the cast iron sealing expansion ring products are improved.

Description

Technical Field

[0001] The invention relates to a method and a device for processing a sealing expansion ring, and belongs to the technical field of expansion ring production. Background Art

[0002] Sealing rings are used to seal between bearing parts and mounting housings. When used in groups, under the action of lubricating oil pressure, the sealing rings are tightly attached to one side of the ring groove, and the outer cylindrical surface and the close end surface of the ring are used to achieve a sealing effect.

[0003] During the application of the sealing ring, its close contact with the shell is the key to ensuring the sealing effect. In order to ensure that the outer cylindrical surface of the sealing ring can fit tightly against the inner diameter of the shell, the sealing ring needs to have sufficient radial tension. If the tension is too small, the fit between the outer cylindrical surface of the ring and the inner diameter of the shell is insufficient, and the sealing function cannot be effectively achieved. Therefore, the size of the radial tension is an important technical indicator in the design and manufacturing process of the sealing ring. In addition, the leakage of the sealing ring is also a key factor in measuring whether its performance is qualified. The size of the leakage directly reflects the sealing effect of the ring, which is of great significance to ensure the normal operation of the entire system.

[0004] The production process of the sealing expansion ring in the prior art is: blank - shape turning - aging treatment - shape fine turning - wire cutting opening - calibrating the opening size and then grinding the end faces on both sides. While the above method ensures the size requirements of the drawing, the opening size and leakage of the expansion ring are difficult to meet the use requirements. Summary of the invention

[0005] In order to solve the problems existing in the background technology, the present invention provides a method and a device for processing a sealing expansion ring.

[0006] To achieve the above object, the present invention adopts the following technical solution: a method for processing a sealing expansion ring, the method comprising the following steps:

[0007] S1: Aging heat treatment of production raw materials;

[0008] S2: Process the process part obtained in S1 into a ring-shaped part and grind its two end faces and outer diameter;

[0009] S3: Cut a Z-shaped opening on the outer wall of the process part obtained in S2;

[0010] S4: heat-treating and finalizing the opening state of the process part obtained in S3 by using a heat-fixing fixture in combination with a heat treatment method;

[0011] S5: After calibrating the opening size of the process part obtained in S4, grinding the two end surfaces thereof;

[0012] S6: performing outer diameter grinding processing on the process part obtained in S5 by using an outer diameter grinding fixture;

[0013] S7: performing inner diameter grinding processing on the process part obtained in S6 by using an inner diameter grinding fixture;

[0014] S8: After the opening size of the process part obtained in S7 is calibrated again, the two end surfaces thereof are ground again;

[0015] S9: Perform leakage test on the process parts obtained in S8 by using a leakage measuring device.

[0016] The thermal fixing fixture described in S4 of the present invention includes a base, a pull rod, a pressure plate, a wedge block, a positioning shaft, a stop pin and an adjustment shaft; the upper end of the base is plugged with a positioning shaft, multiple pull rods and multiple groups of stop pins, the upper end of the positioning shaft is plugged with an adjustment shaft, the upper ends of the adjustment shaft, multiple pull rods and multiple groups of stop pins are all plugged with the pressure plate, and a wedge block is plugged between each of the pull rods and the upper surface of the pressure plate.

[0017] The outer diameter grinding fixture described in S6 of the present invention includes a base plate, a support rod, a clamping bolt and a pressure plate; the upper surface of the inner end of the base plate is connected to the lower ends of multiple support rods and multiple clamping bolts, and multiple pressure plates are provided on the upper end of the base plate. The inner end of each pressure plate is connected to the corresponding support rod, and the middle part of each pressure plate is respectively plugged into the corresponding clamping bolt, and each pressure plate is clamped and connected to the base plate through the corresponding clamping bolt.

[0018] The inner diameter grinding fixture described in S7 of the present invention includes a base plate 2, a pressure plate 2, a clamping bolt 2 and a support rod 2; the upper surface of the outer end of the base plate 2 is connected to a plurality of clamping bolts 2 and the lower ends of a plurality of support rods 2, and a plurality of pressure plates 2 are provided at the upper end of the base plate 2, and the outer end of each of the pressure plates 2 is respectively connected to the corresponding support rod 2, and the middle part of each pressure plate 2 is respectively plugged into the corresponding clamping bolt 2, and each pressure plate 2 is clamped and connected to the base plate 2 by the corresponding clamping bolt 2.

[0019] The leakage measuring device described in S9 of the present invention includes a chassis, a vertical plate, a positioning plate, a sealing sleeve, an oil receiving nozzle, a support sleeve and an oil inlet nozzle; the upper surface of the chassis is fixedly connected to the lower end of the vertical plate, the side of the vertical plate is fixedly connected to the positioning plate, the positioning plate is a cylindrical structure with a closed end, the outer wall of the positioning plate is provided with an oil collecting groove and two expansion ring grooves, the outer side of the positioning plate is sleeved with a support sleeve, the support sleeve is a cylindrical structure, and the outer wall of the support sleeve is provided with a plurality of oil holes, and the oil holes are located between the two expansion ring grooves. The support sleeve is provided with a sealing sleeve on its outer side, the sealing sleeve is a cylindrical structure with a closed end, and an oil collecting chamber is formed between the closed end of the sealing sleeve and the closed end of the positioning plate; an oil inlet groove is provided on the inner wall of the sealing sleeve, and an oil inlet hole is provided on the upper end of the outer wall of the sealing sleeve, the oil inlet hole is connected with the oil inlet groove, and an oil inlet nozzle is inserted in the oil inlet hole; two oil outlet holes are provided at the lower end of the outer wall of the sealing sleeve, the two oil outlet holes are connected with the oil collecting groove and the oil collecting chamber respectively, and an oil nozzle is inserted in each oil outlet hole.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention adopts wire cutting to process the Z-shaped opening, which is simple and efficient to operate, saves the time occupied by traditional machining center milling, reduces the consumption cost of tool, and improves production efficiency.

[0022] 2. The present invention fixes the opening state of the expansion ring by heat treatment, so that the expansion ring has a more stable opening shape, ensuring that after the expansion ring is installed in the sealing groove of the part, it can closely fit the inner diameter of the installation body through the tensioning force, meeting the design requirements of the part.

[0023] 3. The present invention uses a gasket to fix the axial opening size of the expansion ring, and then performs rough grinding and fine grinding to accurately control the processing process of the expansion ring, ensuring that the total thickness and axial opening size of the expansion ring meet the requirements of the parts at the same time. In addition, after the grinding treatment after heat treatment and shaping, the leakage of the sealing expansion ring meets the final use performance, and improves the finished product rate and performance of cast iron sealing expansion ring products. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the thermal fixing fixture of the present invention;

[0025] Figure 2 yes Figure 1 A cross-sectional view of

[0026] Figure 3 It is a schematic diagram of the structure of the base;

[0027] Figure 4 yes Figure 3 A cross-sectional view of

[0028] Figure 5 It is a structural schematic diagram of the pressure plate;

[0029] Figure 6 yes Figure 5 A cross-sectional view of

[0030] Figure 7 It is a schematic diagram of the structure of the outer diameter grinding fixture;

[0031] Figure 8 It is a schematic diagram of the structure of the inner diameter grinding fixture;

[0032] Fig. 9 It is a schematic diagram of the structure of the leakage measurement device;

[0033] Fig.10 It is a structural schematic diagram of the positioning plate;

[0034] Fig.11 It is a structural diagram of the support sleeve;

[0035] Fig.12 It is a schematic diagram of the structure of the sealing sleeve;

[0036] Fig.13 It is a structural diagram of the Z-shaped opening of the part. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] A method for processing a sealing expansion ring, the method comprising the following steps:

[0039] S1: Perform aging heat treatment on the production raw materials (tube blank materials);

[0040] S2: Processing the process part obtained in S1 into a ring-shaped part with thickness and grinding the two end faces and outer diameter thereof;

[0041] S3: Using a wire cutting method, the process part obtained in S2 is wire cut to form a Z-shaped opening along the radial direction on the outer wall of the part;

[0042] S4: heat-treating and finalizing the opening state of the process part obtained in S3 by using a heat-fixing fixture in combination with a heat treatment method;

[0043] S401: stacking a group of ten sealing expansion rings 2 to be processed up and down and sequentially placing them between two stop pins 8 of each group of stop pins 8;

[0044] S402: Expand the Z-shaped opening of the sealing expansion ring 2 by adjusting the shaft 9;

[0045] S403: The sealing ring 2 is pressed tightly through the pressure plate 4 through six groups of stop pins 8, four tie rods 3 and one adjustment shaft 9;

[0046] S404: inserting the wedge blocks 5 into the corresponding wedge block mounting holes of the pull rods 3 respectively, so that the pressure plate 4 reaches a tightening state;

[0047] S405: performing vacuum heat treatment on a group of sealing expansion rings 2;

[0048] S406: performing furnace cooling treatment on the group of process parts obtained in S405;

[0049] S407: air cooling the group of process parts obtained in S406;

[0050] S408: Repeat S401-S407 for each remaining group of sealing rings 2.

[0051] S5: The opening size of the process part obtained in S4 is calibrated by using a weight and a grading gasket, and then both end surfaces are ground;

[0052] S501: Filling the axial opening of the expansion ring with a graded gasket for the process part obtained in S4 to achieve the required opening size;

[0053] S502: Install one set of graded gaskets into the axial opening of the expansion ring, and the thickness of the gasket meets the opening size requirement of the part;

[0054] S503: placing one end of the expanded ring obtained in S502 on a grinding table, pressing a heavy object on the other end, and grinding the lower end surface;

[0055] S504: Repeat the above steps to grind the other end surface.

[0056] The grading gasket for opening size calibration is an arc segment gasket, which is manufactured into 12 levels with a grade of 0.02mm. The grading gasket is used to fill the axial opening gap of the expansion ring and grind the two end faces of the expansion ring. The parallelism of the two ground end faces is continuously checked with heavy objects until the required position is met.

[0057] S6: performing outer diameter grinding processing on the process part obtained in S5 by using an outer diameter grinding fixture;

[0058] S601: Fit the sealing expansion ring 2 to be processed to the outer diameter of the bottom plate 7. If the number of parts is insufficient, use the corresponding gasket to replace the parts;

[0059] S602: After the parts are installed, install the pressing plate 12 on the supporting rod 10 and the clamping bolt 11;

[0060] S603: Rotate the nut on the compression bolt 11 to make the pressure plate 12 compress the sealing ring 2;

[0061] S604: Grind the outer diameter of the sealing ring 2.

[0062] S7: performing inner diameter grinding processing on the process part obtained in S6 by using an inner diameter grinding fixture;

[0063] S701: Install the sealing expansion ring 2 to be processed onto the inner diameter step surface of the bottom plate 13. If the number of parts is insufficient, use the corresponding gasket to replace the part;

[0064] S702: After the parts are installed, the second pressing plate 14 is installed on the second supporting rod 16 and the second pressing bolt 15;

[0065] S703: Rotate the nut on the second compression bolt 15 to make the second compression plate 14 compress the sealing ring 2;

[0066] S704: Grind the inner diameter of the sealing ring 2.

[0067] S8: the opening size of the process part obtained in S7 is calibrated again by using a weight and a grading gasket, and then the two end surfaces are ground again;

[0068] S9: Perform leakage test on the process parts obtained in S8 by using a leakage measuring device.

[0069] S901: The oil inlet nozzle 24 is connected to the lubricating oil pump, and the lubricating oil enters from the oil inlet nozzle 24;

[0070] S902: Lubricating oil enters the oil inlet groove 21 - 1 from the oil inlet hole 21 - 2;

[0071] S903: After the lubricating oil fills the oil groove 21 - 1 , it enters the gap between the positioning plate 19 and the support sleeve 23 through the plurality of oil holes 23 - 1 ;

[0072] S904: The lubricating oil flows through the two sealing rings 2 and enters the oil collecting groove 19-2 and the oil collecting cavity 25 respectively;

[0073] S905: The lubricating oil in the oil collecting groove 19 - 2 and the oil collecting cavity 25 flows out into the corresponding measuring cups through the corresponding oil receiving nozzles 22 .

[0074] S4 The thermal fixing fixture includes a base 1, a pull rod 3, a pressure plate 4, a wedge block 5, a positioning shaft 6, a stop pin 8 and an adjustment shaft 9; the upper end of the base 1 is plugged with a positioning shaft 6, multiple pull rods 3 and multiple groups of stop pins 8, the upper end of the positioning shaft 6 is plugged with an adjustment shaft 9, the upper ends of the adjustment shaft 9, multiple pull rods 3 and multiple groups of stop pins 8 are all plugged with the pressure plate 4, and a wedge block 5 is plugged between each of the pull rods 3 and the upper surface of the pressure plate 4.

[0075] The base 1 and the pressure plate 4 are both hollow disc structures. The base 1 is evenly distributed along its circumference with six groups of stop pin mounting holes 1-1, four tie rod mounting countersunk holes 1-2 and one adjustment shaft type mounting through hole 1-3. Each tie rod mounting countersunk hole 1-2 is processed with an angular limit hole 1-4.

[0076] Each group (6 groups) of stop pins 8 include two stop pins 8 radially arranged along the base 1, each stop pin 8 is a stepped shaft structure, and the small diameter end is assembled to the base 1 by means of a pin hole; the main body of each pull rod 3 is a stepped column structure, and a wedge block mounting hole is provided in the radial direction, which is inserted from the lower end of the base 1 and assembled into the pull rod mounting countersunk hole 1-2 of the base 1, and a cylindrical pin is used to limit the angular direction of the pull rod 3 relative to the pull rod mounting countersunk hole 1-2; the positioning shaft 6 is installed into the adjustment shaft type mounting through hole 1-3 from the lower end of the base 1; the adjustment shaft 9 has a stepped shaft structure in appearance, and a countersunk hole is processed on the large end, which enters from the upper end of the adjustment shaft type mounting through hole 1-3 of the base 1, and the countersunk hole is fitted to the small end of the positioning shaft 6.

[0077] The pressure plate 4 is evenly distributed along its circumferential direction with six keyway-shaped through holes 4-1, four large cylindrical through holes 4-2 and one small-diameter through hole 4-3. The six keyway-shaped through holes 4-1 are used to be plugged with the upper ends of the six groups of stop pins 8, the four large cylindrical through holes 4-2 are used to be plugged with the upper ends of the four pull rods 3, and the one small-diameter through hole 4-3 is used to be plugged with the upper end of the adjustment shaft 9.

[0078] S6 The outer diameter grinding fixture includes a base plate 7, a support rod 10, a clamping bolt 11 and a pressure plate 12; the inner end upper surface of the base plate 7 is connected to the lower ends of multiple support rods 10 and multiple clamping bolts 11, specifically: the base plate 7 is a bushing structure, the inner diameter and outer diameter of the bottom end are both flange structures, and the inner flange edge is evenly distributed along its circumference with eight groups of support rod mounting holes and eight groups of clamping bolt mounting holes. The support rods 10 and clamping bolts 11 are respectively installed in the mounting holes corresponding to the inner flange of the base, and the upper end of the base plate 7 is provided with multiple pressure plates 12 evenly distributed along its circumference, the inner end of each pressure plate 12 is respectively slidably connected to the corresponding support rod 10, the middle part of each pressure plate 12 is respectively plugged with the corresponding clamping bolt 11, and each pressure plate 12 is respectively clamped and connected to the base plate 7 through the corresponding clamping bolt 11.

[0079] S7 The inner diameter grinding fixture includes a bottom plate 13, a pressure plate 14, a clamping bolt 15 and a support rod 16; the upper surface of the outer end of the bottom plate 13 is connected to the lower ends of multiple clamping bolts 15 and multiple support rods 16, specifically: the bottom plate 13 is a flange structure; the inner diameter is a stepped diameter, which is used to install the grinding parts; the upper surface of the outer end is evenly distributed along its circumference with eight groups of support rod 2 mounting holes and eight groups of clamping bolt 2 mounting holes. The clamping bolts 15 and support rods 16 are respectively installed in the corresponding mounting holes of the base 2; the upper end of the bottom plate 13 is provided with multiple pressure plates 14 evenly distributed along its circumference, the outer end of each pressure plate 14 is respectively slidably connected to the corresponding support rod 16, the middle part of each pressure plate 14 is respectively plugged with the corresponding clamping bolt 15, and each pressure plate 14 is clamped and connected to the bottom plate 13 through the corresponding clamping bolt 15.

[0080] S9 The leakage measuring device includes a chassis 17, a vertical plate 18, a positioning plate 19, a sealing sleeve 21, an oil nozzle 22, a support sleeve 23 and an oil inlet nozzle 24; the upper surface of the chassis 17 is fixedly connected to the lower end of the vertical plate 18 by bolts, and the side of the vertical plate 18 is fixedly connected to the positioning plate 19 by bolts. The positioning plate 19 is a cylindrical structure with a closed end. The outer wall of the positioning plate 19 is provided with an oil collecting groove 19-2 and two expansion ring grooves 19-1 arranged around it in a circumferential direction in parallel along its axial direction. The outer side of the positioning plate 19 is sleeved with a support sleeve 23. A sealing ring 20 is provided between the support sleeve 23 and the positioning plate 19. The sealing ring 20 effectively seals the remaining outflow gap of the lubricating oil of the expansion ring. The support sleeve 23 is a cylindrical structure, and the outer wall of the support sleeve 23 is evenly distributed with a plurality of oil holes 23 running through its thickness direction along its circumferential direction. -1, the oil hole 23-1 is located between the two expansion ring grooves 19-1; a sealing sleeve 21 is sleeved on the outer side of the support sleeve 23, the sealing sleeve 21 is a cylindrical structure with a closed end, and an oil collecting chamber 25 is formed between the closed end of the sealing sleeve 21 and the closed end of the positioning plate 19; the inner wall of the sealing sleeve 21 is provided with an oil inlet groove 21-1 along its circumference, and the upper end of the outer wall of the sealing sleeve 21 is provided with an oil inlet hole 21-2 running through the thickness direction thereof, the oil inlet hole 21-2 is connected with the oil inlet groove 21-1, and an oil inlet nozzle 24 is inserted into the oil inlet hole 21-2; the lower end of the outer wall of the sealing sleeve 21 is provided with two oil outlet holes 21-3 running through the thickness direction thereof, the two oil outlet holes 21-3 are respectively connected with the oil collecting groove 19-2 and the oil collecting chamber 25, and an oil nozzle 22 is inserted into each oil outlet hole 21-3.

[0081] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0082] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for processing a sealing expansion ring, characterized in that: The method comprises the following steps: S1: Aging heat treatment of production raw materials; S2: Process the process part obtained in S1 into a ring-shaped part and grind its two end faces and outer diameter; S3: Cut a Z-shaped opening on the outer wall of the process part obtained in S2; S4: heat-treating and finalizing the opening state of the process part obtained in S3 by using a heat-fixing fixture in combination with a heat treatment method; S5: After calibrating the opening size of the process part obtained in S4, grinding the two end surfaces thereof; S501: Filling the axial opening of the expansion ring with a graded gasket for the process part obtained in S4 to achieve the required opening size; S502: Install one set of graded gaskets into the axial opening of the expansion ring, and the thickness of the gasket meets the opening size requirement of the part; S503: placing one end of the expanded ring obtained in S502 on a grinding table, pressing a heavy object on the other end, and grinding the lower end surface; S504: Repeat the above steps to grind the other end surface; S6: performing outer diameter grinding processing on the process part obtained in S5 by using an outer diameter grinding fixture; S7: performing inner diameter grinding processing on the process part obtained in S6 by using an inner diameter grinding fixture; S8: After the opening size of the process part obtained in S7 is calibrated again, the two end surfaces thereof are ground again; S9: Perform leakage inspection on the process parts obtained in S8 by using a leakage measuring device; The leakage measurement device comprises a chassis (17), a vertical plate (18), a positioning plate (19), a sealing sleeve (21), an oil receiving nozzle (22), a support sleeve (23) and an oil inlet nozzle (24); the upper surface of the chassis (17) is fixedly connected to the lower end of the vertical plate (18), the side surface of the vertical plate (18) is fixedly connected to the positioning plate (19), the positioning plate (19) is a cylindrical structure with a closed end, the outer wall of the positioning plate (19) is provided with an oil collecting groove (19-2) and two expansion ring grooves (19-1), the outer side of the positioning plate (19) is sleeved with a support sleeve (23), the support sleeve (23) is a cylindrical structure, and the outer wall of the support sleeve (23) is provided with a plurality of oil holes (23-1), the oil holes (23-1) are located between the two expansion ring grooves (19-1); the support sleeve A sealing sleeve (21) is sleeved on the outer side of the sealing sleeve (23), the sealing sleeve (21) being a cylindrical structure with a closed end, and an oil collecting chamber (25) is formed between the closed end of the sealing sleeve (21) and the closed end of the positioning plate (19); an oil inlet groove (21-1) is provided on the inner wall of the sealing sleeve (21), and an oil inlet hole (21-2) is provided on the upper end of the outer wall of the sealing sleeve (21), the oil inlet hole (21-2) is connected to the oil inlet groove (21-1), and an oil inlet nozzle (24) is inserted into the oil inlet hole (21-2); two oil outlet holes (21-3) are provided on the lower end of the outer wall of the sealing sleeve (21), the two oil outlet holes (21-3) are connected to the oil collecting groove (19-2) and the oil collecting chamber (25) respectively, and an oil receiving nozzle (22) is inserted into each oil outlet hole (21-3).

2. A method for processing a sealing expansion ring according to claim 1, characterized in that: S4 The thermal fixing fixture comprises a base (1), a pull rod (3), a pressure plate (4), a wedge block (5), a positioning shaft (6), a stop pin (8) and an adjustment shaft (9); the upper end of the base (1) is plugged with a positioning shaft (6), a plurality of pull rods (3) and a plurality of groups of stop pins (8); the upper end of the positioning shaft (6) is plugged with an adjustment shaft (9); the upper ends of the adjustment shaft (9), a plurality of pull rods (3) and a plurality of groups of stop pins (8) are all plugged with the pressure plate (4); and a wedge block (5) is plugged between each of the pull rods (3) and the upper surface of the pressure plate (4).

3. A method for processing a sealing expansion ring according to claim 2, characterized in that: The S4 comprises the following steps: S401: stacking a group of sealing expansion rings (2) to be processed up and down and sequentially placing them between each group of stop pins (8); S402: expanding the Z-shaped opening of the sealing expansion ring (2) by adjusting the shaft (9); S403: Pressing the sealing ring (2) by means of the pressure plate (4); S404: inserting the wedge blocks (5) into the wedge block mounting holes of the corresponding pull rods (3) respectively, so that the pressure plate (4) reaches a tightening state; S405: performing vacuum heat treatment on a set of sealing expansion rings (2); S406: performing furnace cooling treatment on the group of process parts obtained in S405; S407: air cooling the group of process parts obtained in S406; S408: Repeat S401 to S407 for each remaining set of sealing rings (2).

4. A method for processing a sealing expansion ring according to claim 1 or 3, characterized in that: S6 The outer diameter grinding fixture comprises a base plate (7), a support rod (10), a clamping bolt (11) and a pressure plate (12); the upper surface of the inner end of the base plate (7) is connected to the lower ends of a plurality of support rods (10) and a plurality of clamping bolts (11); a plurality of pressure plates (12) are provided at the upper end of the base plate (7); the inner end of each pressure plate (12) is respectively connected to the corresponding support rod (10); the middle part of each pressure plate (12) is respectively plugged into the corresponding clamping bolt (11); and each pressure plate (12) is respectively clamped and connected to the base plate (7) by the corresponding clamping bolt (11).

5. A method for processing a sealing expansion ring according to claim 4, characterized in that: The S6 comprises the following steps: S601: Fitting the sealing expansion ring (2) to be processed onto the outer diameter of the bottom plate (7); S602: Install the pressure plate 1 (12) on the support rod 1 (10) and the clamping bolt 1 (11); S603: Rotate the nut on the clamping bolt 1 (11) to allow the clamping plate 1 (12) to clamp the sealing ring (2); S604: Grind the outer diameter of the sealing ring (2).

6. A method for processing a sealing expansion ring according to claim 1 or 5, characterized in that: S7 The inner diameter grinding fixture comprises a base plate 2 (13), a pressure plate 2 (14), a clamping bolt 2 (15) and a support rod 2 (16); the upper surface of the outer end of the base plate 2 (13) is connected to the lower ends of a plurality of clamping bolts 2 (15) and a plurality of support rods 2 (16); a plurality of pressure plates 2 (14) are provided at the upper end of the base plate 2 (13); the outer end of each pressure plate 2 (14) is respectively connected to the corresponding support rod 2 (16); the middle part of each pressure plate 2 (14) is respectively plugged into the corresponding clamping bolt 2 (15); and each pressure plate 2 (14) is clamped and connected to the base plate 2 (13) by the corresponding clamping bolt 2 (15).

7. A method for processing a sealing expansion ring according to claim 6, characterized in that: The S7 comprises the following steps: S701: Install the sealing ring (2) to be processed onto the inner diameter step surface of the second bottom plate (13); S702: Install the second pressing plate (14) on the second supporting rod (16) and the second pressing bolt (15); S703: Rotate the nut on the second clamping bolt (15) to allow the second clamping plate (14) to clamp the sealing ring (2); S704: Grind the inner diameter of the sealing ring (2).

8. A method for processing a sealing expansion ring according to claim 7, characterized in that: The S9 comprises the following steps: S901: Lubricating oil enters from the oil inlet nozzle (24); S902: Lubricating oil enters the oil inlet groove (21-1) from the oil inlet hole (21-2); S903: After the lubricating oil fills the oil groove (21-1), it enters the gap between the positioning plate (19) and the support sleeve (23) through the plurality of oil holes (23-1); S904: The lubricating oil flows through the two sealing rings (2) and enters the oil collecting groove (19-2) and the oil collecting cavity (25) respectively; S905: The lubricating oil in the oil collecting groove (19-2) and the oil collecting cavity (25) flows out into corresponding measuring cups through corresponding oil receiving nozzles (22).

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