A processing method and processing device for a three-petal combined graphite circumferential seal

Abstract

A processing method and a processing device for a three-petal combined graphite circumferential seal, belonging to the technical field of graphite seal production. The method is as follows: rough turning to obtain a blank; drawing lines on the large end face of the blank; dividing each blank into two petal seals; milling the Z-shaped interface and the arc notch of the seal; grinding the axial deflection fitting surface of the Z-shaped interface of the seal; taking the three-petal seal to form a three-petal combined graphite circumferential seal, and checking the tightness of the axial deflection fitting surface of the Z-shaped interface; turning the inner diameter and the auxiliary sealing surface and grinding the auxiliary sealing surface; turning the main sealing surface, the end face groove and the outer diameter groove and grinding the main sealing surface; rough and fine milling the outer shape and the auxiliary sealing surface; processing the main sealing surface and the auxiliary sealing surface. The present invention adopts a marking process to ensure that the processing allowance of the blank body is uniform, and adopts a processing method combining turning, rough grinding, milling, and fine grinding to improve the processing yield and performance of the three-petal combined graphite circumferential seal product.

Description

Technical Field

[0001] The invention relates to a processing method and a processing device of a three-petal combined graphite circumferential seal, and belongs to the technical field of graphite seal production. Background Art

[0002] The three-petal composite graphite circumferential seal forms a complete circumferential seal through the combination of three petal structures, in which the main sealing surface is in close contact with the sealing track, and the auxiliary sealing surface is in contact with the sealing seat, together achieving a reliable sealing effect. However, in the actual production process, the processing accuracy and qualified rate of the seal have become technical bottlenecks that restrict its widespread application.

[0003] In the prior art, the production steps of three-petal combined graphite circumferential seals are: blank - rough turning of the shape - semi-finishing turning of the shape - milling of the seal shape - fine milling of the Z-shaped sealing surfaces at both ends of the seal - fine turning of the inner diameter of the spring support and the end face groove. The above processing process has the following problems:

[0004] 1. Since the graphite material itself is very brittle, the above process is very likely to break or form gaps due to uneven force during turning or milling, causing angle deviation and reducing the qualified rate of the product.

[0005] 2. The Z-shaped sealing surface at both ends of the seal is a key sealing structure, and its processing accuracy directly affects the sealing effect. However, the spatial angle characteristics of the Z-shaped opening significantly increase the difficulty of processing, and it is also necessary to ensure that the axial deflection fitting surface between the two petals after assembly can achieve sufficient close contact. The above process cannot meet the requirements for effective detection of close contact.

[0006] 3. After the three-petal combined graphite circumferential seal is spliced, the flatness of the auxiliary sealing surface needs to reach the thousandth level to ensure a close fit with the sealing seat and effective sealing, which increases the processing difficulty. The above process is difficult to achieve stable production with a high pass rate. Summary of the invention

[0007] In order to solve the problems existing in the background technology, the present invention provides a processing method and a processing device of a three-petal combined graphite circumferential seal.

[0008] To achieve the above object, the present invention adopts the following technical solution: a method for processing a three-petal combined graphite circumferential seal, comprising the following steps:

[0009] S1: Cutting the blank tube to obtain a ring-shaped blank;

[0010] S2: annular blank obtained by rough turning S1;

[0011] S3: Draw horizontal lines and vertical lines on the large end surface of the annular blank obtained in S2;

[0012] S4: Each annular blank obtained in S3 is divided into two sealing parts;

[0013] S5: milling the Z-shaped interfaces at both ends of each single-valve seal and processing four axial arc notches on the inner diameter of each single-valve seal;

[0014] S6: Use a Z-shaped mating surface grinding fixture to grind the Z-shaped interface axial deflection mating surfaces at both ends of the single-flap seal;

[0015] S7: Take the three petals of the qualified grinding seal obtained in S6 to form a three-petal combined graphite circumferential seal, and use the tightness inspection auxiliary fixture to inspect the tightness of the axial deflection fitting surface of the Z-shaped interface;

[0016] S8: Use the inner diameter and end face turning fixture to turn the inner diameter and auxiliary sealing surface of the three-petal combined graphite circumferential seal, and grind the auxiliary sealing surface;

[0017] S9: Use the outer diameter and end face turning fixture to turn the main sealing surface, end face groove and outer diameter groove of the three-petal combined graphite circumferential seal, and grind the main sealing surface;

[0018] S10: using the main sealing surface and inner diameter of the three-petal combined graphite circumferential seal as the positioning surface, rough milling and fine milling the outer shape and auxiliary sealing surface of the three-petal combined graphite circumferential seal respectively;

[0019] S11: Use a sealing surface grinding fixture to process the main sealing surface and auxiliary sealing surface of the three-petal combined graphite circumferential seal by a combination of turning, semi-finishing grinding and finishing grinding.

[0020] S6 The Z-shaped bonding surface grinding fixture includes a left inclined surface grinding fixture and a right inclined surface grinding fixture which are arranged in a mirror-image manner, and the left inclined surface grinding fixture and the right inclined surface grinding fixture both include a base, a positioning seat, a grinding pressure plate, an angle block, an adjustable seat and a grinding block; the upper end of the base is fixedly connected to the positioning seat and the adjustable seat, and the positioning seat includes an integrally formed semicircular ring bottom plate and a semicircular ring protrusion, and the semicircular ring protrusion is concentrically arranged on the inner side of the upper surface of the semicircular ring bottom plate, and a semicircular ring groove is concentrically arranged on the inner side of the upper surface of the semicircular ring protrusion, and an inclined groove is arranged on one side wall of the semicircular ring protrusion, and the upper surface of the semicircular ring protrusion is connected to two grinding pressure plates, and the adjustable seat includes an integrally formed rectangular bottom plate and a trapezoidal protrusion, and the trapezoidal protrusion is arranged in the middle of the upper surface of the rectangular bottom plate, and the inclined surface of the trapezoidal protrusion is used in conjunction with the grinding block; the angle block is a rectangular plate structure, and a wedge-shaped protrusion is provided on the upper end of the back side of the angle block, and the angle block is cooperatively arranged between the positioning seat and the adjustable seat.

[0021] The S6 comprises the following steps:

[0022] S601: placing the single-flap seal in the semicircular ring groove of the positioning seat;

[0023] S602: Adjust one end of the single-flap seal to make it close to the adjustable seat;

[0024] S603: placing an angle block between the positioning seat and the adjustable seat, so that the front side of the angle block fits with the adjustable seat, the wedge-shaped surface of the wedge-shaped protrusion of the angle block fits with the edge line of the end to be ground of the seal, and the radial edge position of the surface to be ground is adjusted by using the angle block;

[0025] S604: After the wedge-shaped surface of the wedge-shaped protrusion coincides with the radial edge of the surface to be ground of the sealing member, the sealing member is pressed by the grinding pressing plate on the positioning seat;

[0026] S605: Remove the corner block;

[0027] S606: The grinding end of the grinding block is reciprocated along the inclined surface of the trapezoidal protrusion of the adjustable seat to grind the axial deflection fitting surface of the Z-shaped interface of the seal.

[0028] S7 The tightness inspection auxiliary fixture includes a chassis and an inspection pressure plate; a through hole is provided in the middle of the chassis, and a concentrically arranged outward expansion groove is provided at the upper end of the inner wall of the through hole. The upper end of the chassis is connected to multiple inspection pressure plates, and the multiple inspection pressure plates are all arranged in coordination with the outward expansion groove.

[0029] The S7 comprises the following steps:

[0030] S701: placing a three-petal composite graphite circumferential seal in the external expansion groove;

[0031] S702: using corresponding plugs to adjust the interface gap between each two adjacent petal seals to ensure that the outer diameters of the three petal seals are in contact with the inner wall of the outer expansion groove;

[0032] S703: Check that the pressure plate is pressed tightly against the three-petal combined graphite circumferential seal;

[0033] S704: Check the horizontal contact surface of each two adjacent seals by coloring.

[0034] S8 The inner diameter and end face turning fixture includes a spindle, a positioning disk, a support ring, a turning pressure plate and a top pin; the spindle is an external stepped hollow cylindrical structure, a sinker is provided in the middle of a large end face of the spindle, a positioning disk is matchedly installed in the sinker, the positioning disk is a circular ring structure, a three-step mounting hole is concentrically provided in the middle of the positioning disk, a support ring is matchedly installed in the mounting hole at the lower end, and a plurality of top pins are provided on the inner wall of the support ring; the mounting hole at the upper end is used to install a three-petal combined graphite circumferential seal; the outer end face of the positioning disk is fixedly connected to a plurality of turning pressure plates, and the plurality of turning pressure plates and the plurality of top pins are all arranged in conjunction with the three-petal combined graphite circumferential seal.

[0035] The S8 comprises the following steps:

[0036] S801: Turning the end face of a three-piece composite graphite circumferential seal:

[0037] S80101: Remove the turning plate;

[0038] S80102: Install the three-petal combined graphite circumferential seal in the uppermost mounting hole of the three-step mounting holes so that the outer diameter of the three-petal combined graphite circumferential seal fits the inner diameter of the uppermost mounting hole of the three-step mounting holes;

[0039] S80103: Adjust the gap between the interfaces of the three-petal combined graphite circumferential seal to the specified state;

[0040] S80104: Screw in the push pin so that its pressing end presses against the inner diameter of the three-petal combined graphite circumferential seal;

[0041] S80105: Turning the end face of a three-piece composite graphite circumferential seal;

[0042] S802: Turning the inner diameter of a three-piece composite graphite circumferential seal:

[0043] S80201: Install the turning pressure plate and press it against the end face of the three-petal combined graphite circumferential seal;

[0044] S80202: Unscrew the top pin so that its pressing end is away from the inner diameter of the three-petal combined graphite circumferential seal;

[0045] S80203: Turning the inner diameter of a three-piece composite graphite circumferential seal.

[0046] S9 The outer diameter and end face turning fixture includes a second spindle, a centering shaft, a second positioning disk, an inner ring pressure plate and an outer ring pressure plate; the second spindle is an externally stepped hollow cylindrical structure, a second sinker is provided in the middle of the large end face of the second spindle, a second positioning disk is matchedly installed in the second sinker, the second positioning disk and the centering shaft are both circular ring structures, an integrally formed annular boss is concentrically provided in the middle of the second positioning disk, the outer end face of the second positioning disk is fixedly connected with multiple outer ring pressure plates and multiple inner ring pressure plates, a centering shaft is matchedly installed in the annular boss, and the centering shaft is arranged between the inner ring pressure plate and the outer ring pressure plate.

[0047] The S9 comprises the following steps:

[0048] S901: Turning the outer diameter of the three-petal combined graphite circumferential seal and the outer end face of the main sealing surface:

[0049] S90101: Remove the outer ring pressure plate;

[0050] S90102: Install the three-petal combined graphite circumferential seal on the outer side of the centering shaft;

[0051] S90103: The end face of the three-petal combined graphite circumferential seal is pressed by the inner ring pressure plate;

[0052] S90104: Turning the outer diameter of three-petal combined graphite circumferential seal and the outer end surface of the main sealing surface;

[0053] S902: Turning the inner end face of the main sealing surface of the three-piece combined graphite circumferential seal:

[0054] S90201: Remove the inner ring pressure plate;

[0055] S90202: The end face of the three-petal combined graphite circumferential seal is pressed by the outer ring pressure plate;

[0056] S90203: Turn the inner end surface of the main sealing surface of the three-petal combined graphite circumferential seal.

[0057] The sealing surface grinding fixture comprises a positioning sleeve, a bushing and a pressing block; the positioning sleeve is tightly inserted with the pressing block and the bushing which are arranged to fit up and down, and the end of the bushing is provided with a concentrically arranged integrally formed mounting platform.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] 1. The present invention changes the milling Z-shaped interface processing method to a five-axis machining center with a forming milling cutter, thereby reducing the angle deviation caused by secondary positioning using a fixture and effectively ensuring the spatial angle requirements and precision requirements of the Z-shaped interface.

[0060] 2. The present invention moves the milling process of the Z-shaped interface between the single-petal seals to after the semi-finishing turning of the blank ring, and adds the Z-shaped interface grinding and tightness inspection processes. The Z-shaped interface fitting surfaces at both ends of the single-petal seals are ground using a Z-shaped fitting surface grinding fixture and a tightness inspection auxiliary fixture. After grinding, the tightness of the two surfaces of the sealing assembly is checked. After the tightness is qualified, the remaining processes are carried out, thereby effectively ensuring the sealing performance of the sealing assembly when it is used.

[0061] 3. The present invention adopts a combination of turning and grinding to correct the inner and outer diameter dimensional accuracy of the end face of the seal assembly before and after the seal assembly, thereby increasing the qualified rate and performance of the three-petal combined graphite circumferential seal on the basis of the qualified tightness of the Z-shaped interface.

[0062] 4. The present invention firstly adopts a scribing process to ensure that the processing allowance of the blank body is uniform, and then adopts a processing method combining turning, rough grinding, milling and fine grinding to improve the processing yield and performance of the three-petal combined graphite circumferential seal product. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 is a schematic structural diagram of an annular blank obtained in S1 of the processing method of the present invention;

[0064] Figure 2 is a schematic diagram of the position of the marking line described in S2 of the processing method of the present invention;

[0065] Figure 3 It is a schematic diagram of the working process described in S3 of the processing method of the present invention;

[0066] Figure 4 yes Figure 3 CC section view;

[0067] Figure 5 yes Figure 3 A schematic diagram of the structure in the G direction;

[0068] Figure 6 yes Figure 3 PP cross-sectional view;

[0069] Figure 7 is a schematic diagram of the structure of a single-flap seal;

[0070] Figure 8 yes Figure 7 AA section view;

[0071] Fig. 9 yes Figure 8 A schematic diagram of the structure in the F direction;

[0072] Fig.10 It is a structural schematic diagram of the left inclined surface grinding fixture;

[0073] Fig.11 yes Fig.10 BB cross-sectional view;

[0074] Fig.12 It is a structural schematic diagram of the positioning seat;

[0075] Fig.13 yes Fig.12 The main view;

[0076] Fig.14 It is a schematic diagram of the structure of the adjustable seat;

[0077] Fig.15 yes Fig.14 A cross-sectional view of

[0078] Fig.16 Schematic diagram of the structure of the angle block, wherein: (a) is a front view, (b) is a rear view, (c) is a top view, and (d) is a side view;

[0079] Fig.17 It is a schematic diagram of the structure of the grinding block;

[0080] Fig.18 It is a structural schematic diagram of the auxiliary fixture for tightness inspection;

[0081] Fig.19 yes Fig.18 A top view of

[0082] Fig. 20 It is a schematic diagram of the structure of the inner diameter and end face turning fixture;

[0083] Fig.21 yes Fig. 20 DD cross-sectional view;

[0084] Fig. 22 It is a schematic diagram of the structure of the outer diameter and end face turning fixture;

[0085] Fig.23 yes Fig. 22 EE cross-sectional view;

[0086] Fig.24 It is a structural schematic diagram of the sealing surface grinding fixture; DETAILED DESCRIPTION

[0087] 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.

[0088] A method for processing a three-petal combined graphite circumferential seal, the method comprising the following steps:

[0089] S1: Cutting the blank tube to obtain a ring-shaped blank;

[0090] S2: Rough turning the annular blank obtained by S1, so that the two end faces of the rough turned blank meet the flatness requirements (the large end face meets the parallelism ≤ 0.03, and the small end face meets the flatness ≤ 0.05);

[0091] S3: Draw a horizontal line 8 and a vertical line 9 on the large end surface of the annular blank obtained in S2 to ensure that the subsequent processing has a uniform allowance;

[0092] S4: Each annular blank obtained in S3 is divided into two single-petal sealing members 16;

[0093] S5: Use a dovetail milling cutter in conjunction with a five-axis machining center to respectively mill the Z-shaped interfaces at both ends of each single-valve seal 16 and to machine four axial arc notches 25 on the inner diameter of each single-valve seal 16;

[0094] In order to improve the spatial angle accuracy requirements of each surface of the Z-shaped interface, a five-axis machining center is selected for spatial angle deflection, and then the Z-shaped interface processing can be completed in conjunction with a formed dovetail milling cutter.

[0095] S6: grinding the Z-shaped interface axial deflection bonding surfaces at both ends of the single-flap seal 16 using a Z-shaped bonding surface grinding fixture;

[0096] There is a fitting surface at each end of each seal. In view of the different angles and directions of the fitting surfaces at both ends, a Z-shaped fitting surface grinding fixture is designed to grind the fitting surface of the single-sided seal until it meets the part requirements, effectively improving the sealing degree of the fitting surfaces of the two adjacent seals.

[0097] S6 The Z-shaped laminating surface grinding fixture comprises a left inclined surface grinding fixture and a right inclined surface grinding fixture which are arranged in a mirror image, and the left inclined surface grinding fixture and the right inclined surface grinding fixture both comprise a base 1, a positioning seat 2, a grinding pressure plate 3, an angle block 4, an adjustable seat 5 and a grinding block 7; the base 1 is a rectangular metal plate structure; the upper end of the base 1 is fixedly connected to the positioning seat 2 and the adjustable seat 5, and the positioning seat 2 comprises an integrally formed semicircular ring bottom plate 13 and a semicircular ring protrusion 1 0, the semicircular protrusion 10 is concentrically arranged on the inner side of the upper surface of the semicircular bottom plate 13, the inner side of the upper surface of the semicircular protrusion 10 is concentrically provided with a semicircular recessed groove 11, and one side wall of the semicircular protrusion 10 is provided with an inclined groove 12, that is: a Z-shaped fitting surface; the semicircular bottom plate 13 is provided with a threaded hole, which is connected to the base 1 by bolts, and the upper surface of the semicircular protrusion 10 is connected to two grinding pressure plates 3 arranged along its radial direction by bolts, and the upper end surface of the semicircular bottom plate 13 has two threaded holes for installation The grinding pressure plate 3 is used to press the single-flap seal 16, and the semicircular ring groove 11 is used to install the single-flap seal 16; the adjustable seat 5 includes an integrally formed rectangular bottom plate 14 and a trapezoidal protrusion 15, and the trapezoidal protrusion 15 is arranged in the middle of the upper surface of the rectangular bottom plate 14, and the middle width of the rectangular bottom plate 14 is greater than the width of the two sides. Two rectangular through holes are processed on both sides of the rectangular bottom plate 14 along the length direction, and the stepped guide pillars 6 are respectively inserted into the corresponding rectangular through holes and then inserted into the installation of the base 1 through interference. The sliding direction of the adjustable seat 5 relative to the base 1 is limited in the mounting hole, and then bolts are used to pass through two rectangular through holes to lock the adjustable seat 5 with the base 1 and ensure that the flatness of the fitting surface of the adjustable seat 5 and the positioning seat 2 is ≤0.015. The inclined surface of the trapezoidal protrusion 15 is used in conjunction with the grinding block 7; the angle block 4 is a rectangular plate structure, and a wedge-shaped protrusion 17 is provided on the upper end of the back of the angle block 4. A handle 14 is fixed on the upper end of the angle block 4, and the angle block 4 is arranged between the positioning seat 2 and the adjustable seat 5. The main body of the grinding block 7 is an I-shaped structure, the upper end is a cylindrical handle end and the surface is processed by a mesh pattern, the lower end is a bowl-shaped structure, and the large end face of the bowl is a grinding end face.

[0098] The S6 comprises the following steps:

[0099] S601: placing the single-petal seal 16 in the semicircular ring groove 11 of the positioning seat 2;

[0100] S602: Adjust one end of the single-flap seal 16 to make it close to the adjustable seat 5;

[0101] S603: placing the angle block 4 between the positioning seat 2 and the adjustable seat 5, so that the front surface of the angle block 4 fits with the adjustable seat 5, the wedge surface of the wedge-shaped protrusion 17 of the angle block 4 fits with the edge line of the end to be ground of the seal 16, and the radial edge position of the surface to be ground is adjusted by using the angle block 4;

[0102] S604: After the wedge-shaped surface of the wedge-shaped protrusion 17 coincides with the radial edge of the surface to be ground of the seal 16, the seal 16 is pressed by the grinding pressing plate 3 on the positioning seat 2;

[0103] S605: Remove the angle block 4;

[0104] S606: The grinding end of the grinding block 7 is reciprocated along the inclined surface of the trapezoidal protrusion 15 of the adjustable seat 5 to grind the axially deflected fitting surface of the Z-shaped interface of the sealing member 16 so that its flatness is not greater than 0.01 mm.

[0105] S7: Take the three petals of the qualified grinding seal 16 obtained in S6 to form a three-petal combined graphite circumferential seal, and use a tightness inspection auxiliary fixture to inspect the tightness of the axial deflection fitting surface of the Z-shaped interface;

[0106] S7 The tightness inspection auxiliary fixture includes a chassis 18 and an inspection pressure plate 19; the chassis 18 is a rectangular plate, and semicircular open keyways 26 are processed on both sides of the chassis 18. A through hole 27 is provided in the middle of the chassis 18, and a concentrically arranged outer expansion groove 28 is provided at the upper end of the inner wall of the through hole 27. The aperture size of the outer expansion groove 28 matches the outer diameter size of the seal 16. The upper end of the chassis 18 is connected to a plurality of inspection pressure plates 19 evenly distributed along its circumference by bolts, and the plurality of inspection pressure plates 19 are all arranged in conjunction with the outer expansion groove 28.

[0107] The S7 comprises the following steps:

[0108] S701: placing a three-petal combined graphite circumferential seal in the outer expansion groove 28;

[0109] S702: Using corresponding plugs to adjust the interface gap between each two adjacent petal seals 16 to ensure that the outer diameters of the three petal seals 16 are in contact with the inner wall of the outer expansion groove 28;

[0110] S703: Check that the pressure plate 19 is pressed tightly against the three-petal combined graphite circumferential seal;

[0111] S704: Check the horizontal contact surface of each two adjacent seals 16 by coloring. The close contact degree is required to be no less than 60%, and the axial deflection fitting surface of the Z-shaped interface is not less than 80% and uninterrupted.

[0112] Whether the grinding meets the requirements is determined by the colored area and continuity of the fitting surface. If the close contact does not reach the requirement of 90%, it will be returned for re-grinding until it is qualified, which effectively guarantees the actual performance of the two adjacent petals of the seal.

[0113] S8: Use the inner diameter and end face turning fixture to turn the inner diameter and auxiliary sealing surface of the three-petal combined graphite circumferential seal, and grind the auxiliary sealing surface to make its flatness not greater than 0.01mm;

[0114] S8 The inner diameter and end face turning fixture includes a spindle 20, a positioning plate 21, a support ring 22, a turning pressure plate 23 and a top pin 24; the spindle 20 is an external stepped hollow cylindrical structure, a sinker is provided in the middle of the end face of the large end of the spindle 20, a positioning plate 21 is matched and installed in the sinker, and a machine tool alignment ring is processed on the outer wall of the large end of the spindle 20; the positioning plate 21 is a circular ring structure, a three-step mounting hole is concentrically provided in the middle of the positioning plate 21, a support ring 22 is matched and installed in the mounting hole at the lower end, and the support ring 22 The inner wall of is evenly distributed along its circumference with a plurality of countersunk holes arranged along its axial direction, and each of the countersunk holes is screwed with a corresponding top pin 24; the top pin 24 has a standard bolt structure, but its small end is a spherical structure, and the outer diameter of the large end is processed with a mesh pattern for manual adjustment; the top mounting hole is used to install a three-petal combined graphite circumferential seal; the outer end surface of the positioning plate 1 21 is fixedly connected with a plurality of turning pressure plates 23 evenly distributed along its circumference, and the plurality of turning pressure plates 23 and the plurality of top pins 24 are all arranged in cooperation with the three-petal combined graphite circumferential seal. The main body of the turning pressure plate 23 is a hook-shaped pressure plate, and copper is welded at the pressing end to prevent scratching the seal.

[0115] The S8 comprises the following steps:

[0116] S801: Turning the end face of a three-piece composite graphite circumferential seal:

[0117] S80101: Remove the turning pressing plate 23;

[0118] S80102: Install the three-petal combined graphite circumferential seal in the uppermost mounting hole of the three-step mounting holes so that the outer diameter of the three-petal combined graphite circumferential seal fits the inner diameter of the uppermost mounting hole of the three-step mounting holes;

[0119] S80103: Adjust the gap between the interfaces of the three-petal combined graphite circumferential seal to the specified state through the corresponding plugs;

[0120] S80104: Screw in the top pin 24 so that its pressing end presses against the inner diameter of the three-petal combined graphite circumferential seal;

[0121] S80105: Turning the end face of a three-piece composite graphite circumferential seal;

[0122] S802: Turning the inner diameter of a three-piece composite graphite circumferential seal:

[0123] S80201: Install the turning pressure plate 23 and make it press against the end face of the three-petal combined graphite circumferential seal;

[0124] S80202: Unscrew the top pin 24 so that its pressing end is away from the inner diameter of the three-petal combined graphite circumferential seal;

[0125] S80203: Turning the inner diameter of a three-piece composite graphite circumferential seal.

[0126] S9: Use the outer diameter and end face turning fixture to turn the main sealing surface, end face groove and outer diameter groove of the three-petal combined graphite circumferential seal, and grind the main sealing surface to make its flatness not greater than 0.01mm;

[0127] S9 The outer diameter and end face turning fixture includes a second spindle 29, a centering shaft 30, a second positioning disk 31, an inner ring pressure plate 32 and an outer ring pressure plate 33; the second spindle 29 is an external stepped hollow cylindrical structure, a second sinker is provided in the middle of the large end face of the second spindle 29, a second positioning disk 31 is matchedly installed in the second sinker, and a machine tool alignment ring is processed on the outer wall of the large end of the second spindle 29; the second positioning disk 31 and the centering shaft 30 are both circular ring structures, and an integrally formed annular boss 34 is concentrically provided in the middle of the second positioning disk 31, and the outer end face of the second positioning disk 31 is fixedly connected with a plurality of outer ring pressure plates 33 evenly distributed along its circumference and a plurality of inner ring pressure plates 32 evenly distributed along its circumference, and a centering shaft 30 is matchedly installed in the annular boss 34, and the centering shaft 30 is arranged between the inner ring pressure plate 32 and the outer ring pressure plate 33. The second spindle 29, the centering shaft 30, and the second positioning plate 31 are connected by bolts.

[0128] The S9 comprises the following steps:

[0129] Since the main sealing surface has an end face groove structure, it is divided into an inner end face and an outer end face of the main sealing surface based on the end face groove of the main sealing surface;

[0130] S901: Turning the outer diameter of the three-petal combined graphite circumferential seal and the outer end face of the main sealing surface:

[0131] S90101: Remove the outer ring pressure plate 33;

[0132] S90102: Sleeve a three-petal combined graphite circumferential seal on the outer side of the centering shaft 30;

[0133] S90103: Press the end face of the three-petal combined graphite circumferential seal by the inner ring pressure plate 32;

[0134] S90104: Turning the outer diameter of three-petal combined graphite circumferential seal and the outer end surface of the main sealing surface;

[0135] S902: Turning the inner end face of the main sealing surface of the three-piece combined graphite circumferential seal:

[0136] S90201: Remove the inner ring pressure plate 32;

[0137] S90202: Press the end face of the three-petal combined graphite circumferential seal by the outer ring pressure plate 33;

[0138] S90203: Turn the inner end surface of the main sealing surface of the three-petal combined graphite circumferential seal.

[0139] S10: using the main sealing surface and inner diameter of the three-petal combined graphite circumferential seal as the positioning surface, rough milling and fine milling the outer shape and auxiliary sealing surface of the three-petal combined graphite circumferential seal respectively;

[0140] S11: Use a sealing surface grinding fixture to process the main sealing surface and auxiliary sealing surface of the three-petal combined graphite circumferential seal by a combination of turning, semi-finishing grinding and finishing grinding to achieve the expected size and shape and position tolerance requirements.

[0141] The sealing surface grinding fixture comprises a positioning sleeve 35 , a bushing 36 and a pressing block 37 ; the positioning sleeve 35 is tightly inserted with the pressing block 37 and the bushing 36 which are arranged to fit up and down, and the end of the bushing 36 is provided with a concentrically arranged integral mounting platform 38 .

[0142] The positioning sleeve 35 is an annular structure with an I-shaped cross section. The inner diameter of the positioning sleeve 35 matches the outer diameter of the three-petal combined graphite circumferential seal, and different inner diameter levels are added according to the size conditions used in different processes; the three-petal combined graphite circumferential seal is mounted on the outside of the mounting platform 38, and the pressing block 37 is a tubular structure. The outer diameter of the pressing block 37 matches the inner diameter of the positioning sleeve 35; during grinding, the pressing block 37 transfers its own gravity to the three-petal combined graphite circumferential seal through the bushing 36, which plays the role of pressing the seal during grinding.

[0143] 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.

[0144] 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 three-petal combined graphite circumferential seal, characterized in that: The method comprises the following steps: S1: Cutting the blank tube to obtain a ring-shaped blank; S2: annular blank obtained by rough turning S1; S3: Draw a horizontal line (8) and a vertical line (9) on the large end surface of the annular blank obtained in S2; S4: Each of the annular blanks obtained in S3 is divided into two sealing parts (16); S5: milling the Z-shaped interfaces at both ends of each single-flap seal (16) and processing four axial arc notches (25) on the inner diameter of each single-flap seal (16); S6: grinding the axially deflected mating surfaces of the Z-shaped interfaces at both ends of the single-flap seal (16) using a Z-shaped mating surface grinding fixture; S6 The Z-shaped laminating surface grinding fixture comprises a left inclined surface grinding fixture and a right inclined surface grinding fixture which are arranged in a mirror image, and the left inclined surface grinding fixture and the right inclined surface grinding fixture both comprise a base (1), a positioning seat (2), a grinding pressure plate (3), an angular block (4), an adjustable seat (5) and a grinding block (7); the upper end of the base (1) is fixedly connected to the positioning seat (2) and the adjustable seat (5), and the positioning seat (2) comprises an integrally formed semicircular ring bottom plate (13) and a semicircular ring protrusion (10), and the semicircular ring protrusion (10) is concentrically arranged on the inner side of the upper surface of the semicircular ring bottom plate (13), and the upper surface of the semicircular ring protrusion (10) is A semicircular groove (11) is concentrically arranged on the inner side of the surface, an inclined groove (12) is arranged on one side wall of the semicircular protrusion (10), the upper surface of the semicircular protrusion (10) is connected to two grinding pressure plates (3), the adjustable seat (5) comprises an integrally formed rectangular bottom plate (14) and a trapezoidal protrusion (15), the trapezoidal protrusion (15) is arranged in the middle of the upper surface of the rectangular bottom plate (14), and the inclined surface of the trapezoidal protrusion (15) is used in conjunction with the grinding block (7); the angle block (4) is a rectangular plate structure, the upper end of the back side of the angle block (4) is provided with a wedge-shaped protrusion (17), and the angle block (4) is arranged in conjunction between the positioning seat (2) and the adjustable seat (5); S7: Take the three petals of the qualified grinding seal (16) obtained in S6 to form a three-petal combined graphite circumferential seal, and use a tightness inspection auxiliary fixture to inspect the tightness of the axial deflection fitting surface of the Z-shaped interface; The S7 comprises the following steps: S701: placing a three-petal combined graphite circumferential seal in the outer expansion groove (28); S702: using corresponding plugs to adjust the interface gap between each two adjacent petal seals (16) to ensure that the outer diameters of the three petal seals (16) are in contact with the inner wall of the outer expansion groove (28); S703: Check that the pressure plate (19) is pressed tightly against the three-petal combined graphite circumferential seal; S704: Coloring and inspecting the horizontal contact surface of each two adjacent sealing pieces (16); S8: Use the inner diameter and end face turning fixture to turn the inner diameter and auxiliary sealing surface of the three-petal combined graphite circumferential seal, and grind the auxiliary sealing surface; The S8 comprises the following steps: S801: Turning the end face of a three-piece composite graphite circumferential seal: S80101: Remove the turning press plate (23); S80102: Install the three-petal combined graphite circumferential seal in the uppermost mounting hole of the three-step mounting holes so that the outer diameter of the three-petal combined graphite circumferential seal fits the inner diameter of the uppermost mounting hole of the three-step mounting holes; S80103: Adjust the gap between the interfaces of the three-petal combined graphite circumferential seal to the specified state; S80104: Screw in the push pin (24) so ​​that its pressing end presses against the inner diameter of the three-petal combined graphite circumferential seal; S80105: Turning the end face of a three-piece composite graphite circumferential seal; S802: Turning the inner diameter of a three-piece composite graphite circumferential seal: S80201: Install the turning pressure plate (23) and make it press against the end surface of the three-petal combined graphite circumferential seal; S80202: Unscrew the top pin (24) so ​​that its pressing end is away from the inner diameter of the three-piece combined graphite circumferential seal; S80203: Turning the inner diameter of a three-piece composite graphite circumferential seal; S9: Use the outer diameter and end face turning fixture to turn the main sealing surface, end face groove and outer diameter groove of the three-petal combined graphite circumferential seal, and grind the main sealing surface; The S9 comprises the following steps: S901: Turning the outer diameter of the three-petal combined graphite circumferential seal and the outer end face of the main sealing surface: S90101: Remove the outer ring pressure plate (33); S90102: Sleeve a three-petal combined graphite circumferential seal on the outer side of the centering shaft (30); S90103: Pressing the end face of the three-petal combined graphite circumferential seal by means of the inner ring pressure plate (32); S90104: Turning the outer diameter of three-petal combined graphite circumferential seal and the outer end surface of the main sealing surface; S902: Turning the inner end face of the main sealing surface of the three-piece combined graphite circumferential seal: S90201: Remove the inner ring pressure plate (32); S90202: Pressing the end face of the three-petal combined graphite circumferential seal by means of the outer ring pressure plate (33); S90203: Turning the inner end surface of the main sealing surface of the three-petal combined graphite circumferential seal; S10: using the main sealing surface and inner diameter of the three-petal combined graphite circumferential seal as the positioning surface, rough milling and fine milling the outer shape and auxiliary sealing surface of the three-petal combined graphite circumferential seal respectively; S11: Use a sealing surface grinding fixture to process the main sealing surface and auxiliary sealing surface of the three-petal combined graphite circumferential seal by a combination of turning, semi-finishing grinding and finishing grinding.

2. The method for processing a three-petal combined graphite circumferential seal according to claim 1, characterized in that: The S6 comprises the following steps: S601: placing the single-flap seal (16) in the semicircular ring groove (11) of the positioning seat (2); S602: Adjust one end of the single-flap seal (16) so that it is close to the adjustable seat (5); S603: placing the angle block (4) between the positioning seat (2) and the adjustable seat (5), so that the front face of the angle block (4) is in contact with the adjustable seat (5), the wedge-shaped surface of the wedge-shaped protrusion (17) of the angle block (4) is in contact with the edge line of the end to be ground of the sealing member (16), and the radial edge position of the surface to be ground is adjusted using the angle block (4); S604: After the wedge-shaped surface of the wedge-shaped protrusion (17) and the radial edge of the surface to be ground of the sealing member (16) are overlapped, the sealing member (16) is pressed by the grinding pressing plate (3) on the positioning seat (2); S605: Remove the angle block (4); S606: The grinding end of the grinding block (7) is reciprocated along the inclined surface of the trapezoidal protrusion (15) of the adjustable seat (5) to grind the axially deflected fitting surface of the Z-shaped interface of the sealing member (16).

3. The method for processing a three-petal combined graphite circumferential seal according to claim 1, characterized in that: S7 The tightness inspection auxiliary fixture comprises a chassis (18) and an inspection pressure plate (19); a through hole (27) is provided in the middle of the chassis (18); the upper end of the inner wall of the through hole (27) is provided with a concentrically arranged outer expansion groove (28); the upper end of the chassis (18) is connected to a plurality of inspection pressure plates (19), and the plurality of inspection pressure plates (19) are all arranged in coordination with the outer expansion groove (28).

4. The method for processing a three-petal combined graphite circumferential seal according to claim 1, characterized in that: S8 The inner diameter and end face turning fixture comprises a spindle (20), a positioning disk (21), a support ring (22), a turning pressure plate (23) and a top pin (24); the spindle (20) is an external stepped hollow cylindrical structure, a sinker is provided in the middle of the large end face of the spindle (20), a positioning disk (21) is matchedly installed in the sinker, the positioning disk (21) is a circular ring structure, a three-step mounting hole is concentrically provided in the middle of the positioning disk (21), a support ring (22) is matchedly installed in the mounting hole at the bottom, and a plurality of top pins (24) are provided on the inner wall of the support ring (22); the mounting hole at the top is used to install a three-petal combined graphite circumferential seal; the outer end face of the positioning disk (21) is fixedly connected to a plurality of turning pressure plates (23), and the plurality of turning pressure plates (23) and the plurality of top pins (24) are all arranged in conjunction with the three-petal combined graphite circumferential seal.

5. The method for processing a three-petal combined graphite circumferential seal according to claim 1, characterized in that: S9 The outer diameter and end face turning fixture comprises a second spindle (29), a centering shaft (30), a second positioning disk (31), an inner ring pressure plate (32) and an outer ring pressure plate (33); the second spindle (29) is an outer stepped hollow cylindrical structure, a second sinker is provided in the middle of the large end face of the second spindle (29), a second positioning disk (31) is matchedly installed in the second sinker, the second positioning disk (31) and the centering shaft (30) are both circular ring structures, an integrally formed annular boss (34) is concentrically provided in the middle of the second positioning disk (31), the outer end face of the second positioning disk (31) is fixedly connected with a plurality of outer ring pressure plates (33) and a plurality of inner ring pressure plates (32), a centering shaft (30) is matchedly installed in the annular boss (34), and the centering shaft (30) is arranged between the inner ring pressure plate (32) and the outer ring pressure plate (33).

6. The method for processing a three-petal combined graphite circumferential seal according to claim 1, characterized in that: The sealing surface grinding fixture comprises a positioning sleeve (35), a bushing (36) and a pressing block (37); the positioning sleeve (35) is tightly inserted with the pressing block (37) and the bushing (36) arranged to fit in the upper and lower parts, and the end of the bushing (36) is provided with a concentrically arranged integral mounting platform (38).

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