A method of machining a guide mechanism

Abstract

The application discloses a guide mechanical assembly machining method in the technical field of guide mechanical assembly machining, and designs a special fixture, fixes and positions the guide, the sealing ring and the support plate through the fixture, and ensures the assembly precision of the guide, the sealing ring and the support plate during assembly, so that the spraying groove can be machined in the state of the sealing ring part, the installation edge of the sealing ring can be directly clamped during machining of the spraying groove in the state of the part, the machining precision of the spraying groove is ensured, meanwhile, the fixture comprises a plurality of support rods, the support rods are used for supporting rivets, all the rivets in all the riveting holes can be assembled at a time during assembly of the rivets, the assembly efficiency is improved, the machining and assembly difficulty of the guide mechanical assembly as a whole is reduced, the machining precision of the whole part and the assembly precision between the parts are effectively improved, the machining efficiency is improved, and the yield of products is also improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical combination machining of a guide, in particular to a guide mechanical combination machining method. BACKGROUND

[0002] The guide mechanical combination is an important component of a gas turbine, as shown in Fig. 1, which is composed of a support plate, a sealing ring and a guide, wherein the support plate and the guide are riveted and fixed, the sealing ring and the support plate are riveted and fixed, the support plate, the sealing ring and the guide are annular, a riveting ring is fixedly arranged in the inner cavity of the guide, the part of the support plate close to the shaft is riveted with the sealing ring, and the part of the support plate away from the shaft is riveted with the guide. Figure 3 The inner annular surface of the sealing ring is provided with a coating for cooperating with the rotor of the gas turbine, in order to ensure the gap between the guide mechanical combination and the rotor, as shown in Fig. 2, the design requires that the surface of the coating and the guide coaxiality | Φ0.05 | A, the inner ring coating thickness b ~ b.05, thus, firstly, the coaxiality of the sealing ring inner annular spraying groove and the guide needs to be ensured, so as to ensure the coaxiality of the coating and the thickness of the coating, but in the current machining process, the guide and the support plate are not fixed during the riveting process of the support plate and the guide, if the spraying groove is processed first, it is difficult to ensure the coaxiality of the spraying groove and the guide in the subsequent assembly process, therefore, the sealing ring inner annular spraying groove must be processed after the guide mechanical combination is completely assembled, so as to ensure the machining precision requirement of the spraying groove, but the sealing ring material has high hardness, the cutting force is large when the excess amount is removed, at the same time, the sealing ring is connected with the guide through the support plate with a suspension of about 1-2mm, the rigidity of the machining system is poor, the tool vibration problem exists, the precision spraying groove size is difficult to process qualified, and the yield is low.

[0003] Figures 3-4 Based on this, the present application designs a guide mechanical combination machining method to solve the above problems. SUMMARY

[0004] To achieve the above purpose, the present application provides the following technical scheme: a guide mechanical combination machining method, characterized in that:

[0005] In order to achieve the above purpose, the present application provides the following technical scheme: a guide mechanical combination machining method, characterized in that:

[0006] ​The gasket, the support plate and the guide are fixed by using a clamp, the clamp comprises a mounting seat, a support rod, a positioning ring, a pull rod and a pressing disc, the positioning ring is fixed on the mounting seat, the support rod is inserted into the mounting seat, the pull rod is arranged in the mounting seat and the pressing disc and is used for adjusting the distance between the mounting seat and the pressing disc, after the support plate and the gasket are riveted together, the support plate is placed into the guide from the small head end of the guide to the riveting ring, then the support rod supports the riveting ring in the guide from the other side of the riveting ring in the guide, the pull rod is tightened to make the pressing disc tightly press on the gasket to apply pressure to the gasket towards the mounting seat, the gasket and the support plate riveted together are tightly pressed on the riveting ring in the guide, and the positioning ring is used for positioning the gasket;

[0007] The guide mechanical combination machining method comprises the following steps:

[0008] S1, machining the gasket spray groove in a part state;

[0009] S2, spraying a coating on the surface of the spray groove, reserving a machining allowance, and riveting the gasket and the support plate together;

[0010] S3, aligning the riveting holes arranged on the surface of the support plate with the riveting holes arranged on the riveting ring in the guide, and inserting all the rivets into all the riveting holes, the big head end of the rivet faces the big head end of the guide, then the gasket and the guide are fixed by using the clamp, and the support rod in the clamp is supported on the big head end of the rivet;

[0011] S4, impact forming the rivet to complete the connection between the guide and the support plate;

[0012] S5, machining the surface coating of the gasket, and removing the clamp.

[0013] As a further scheme of the application, in step S3, the method for fixing the gasket and the guide by using the clamp is as follows:

[0014] S31, placing the pressing disc on the workbench to keep the pressing disc horizontal, placing the support plate and the gasket riveted in step S2 on the pressing disc, and keeping the side of the support plate for contacting the riveting ring in the guide upwards;

[0015] S32, placing the small head of the guide downwards, making the riveting ring in the guide contact the support plate, and aligning the riveting holes arranged on the surface of the riveting ring in the guide with the riveting holes arranged on the surface of the support plate;

[0016] S33, inserting the rivet into the aligned riveting holes, and ensuring that the rivet is inserted into each riveting hole;

[0017] S34, the support rod is inserted obliquely between the support plate and the guide, and the rivet and the inner riveting ring of the guide are in contact with the side away from the support plate, the positioning ring is fixed with the mounting seat, and then the positioning ring is sleeved downward to the outer ring surface of the sealing ring to position the sealing ring, and the top end of the support rod is inserted into the mounting seat, then the pull rod is threaded through the mounting seat and the compression disc to engage with the compression disc, and the compression disc is controlled to be close to the mounting seat to apply pressure to the sealing ring toward the mounting seat;

[0018] S35, the jig, the guide and the sealing ring are turned together by half a circle, and the small head end of the guide faces upward.

[0019] As a further scheme of the present application, a limiting groove is formed at the end of the positioning ring away from the mounting seat, the limiting groove has a sidewall with a diameter matching the outer diameter of the sealing ring and a bottom wall for contacting the end surface of the sealing ring.

[0020] As a further scheme of the present application, in step S5, when processing the surface coating of the sealing ring, the pull rod and the compression disc on the whole jig are removed first, then the small head of the guide is placed upward together with the mounting seat, the positioning ring and the support rod on the processing platform to support and limit the sealing ring through the limiting groove on the positioning ring.

[0021] As a further scheme of the present application, in step S1, when processing the spraying groove, the coaxiality of the spraying groove relative to the outer circle of the sealing ring is not greater than 0.01mm.

[0022] As a further scheme of the present application, the jig further comprises a base, and the base is provided with a first positioning groove for placing and positioning the compression disc and a second positioning groove for placing and positioning the mounting seat.

[0023] As a further scheme of the present application, a positioning pin is fixedly arranged on the side of the base provided with the second positioning groove, and the positioning pin is used to contact the outer ring surface of the large head end of the guide to position the guide.

[0024] As a further scheme of the present application, the second positioning groove is a circular ring, and the shape of the part of the mounting seat inserted into the second positioning groove matches the shape of the second positioning groove.

[0025] As a further scheme of the present application, the support rod comprises a vertical section for connecting with the mounting seat and a support section for supporting the rivet, the vertical section is perpendicular to the mounting seat, there is a preset angle between the support section and the vertical section, and the included angle between the support section and the vertical section is not less than 120°.

[0026] The present application has the following beneficial effects:

[0027] The present application designs a special fixture, which is used for fixing the guide, the sealing ring and the support plate when the support plate is riveted with the guide, so that the spraying groove can be machined in the state of the sealing ring part, and the installation edge of the sealing ring can be directly clamped when the spraying groove in the sealing ring is machined in the state of the part, so as to ensure the machining precision of the spraying groove, and meanwhile, the fixture includes a plurality of support rods, which are used for supporting the rivets, so that all the rivets can be assembled in all the rivet holes at one time, the assembly efficiency is improved, the machining and assembly difficulty of the guide mechanical combination whole is reduced, the machining precision of the whole part and the assembly precision between the parts are effectively improved, the machining efficiency is improved, and the product yield is also improved.

[0028] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, illustrate the preferred embodiments of the application and assist in the explanation of the application. In the drawings, the same reference numbers represent the same elements throughout the several views of the drawings:

[0030] Figure 1 It is a schematic diagram of the fixture of the present application.

[0031] Figure 2 It is a schematic diagram of the fixture of the present application after being turned over.

[0032] Figure 3 It is a schematic diagram of the guide mechanical combination structure.

[0033] Figure 4 It is a schematic diagram of the spraying groove structure.

[0034] Figure 5 It is a flow chart of the machining method of the guide mechanical combination in the present application.

[0035] LEGEND:

[0036] 1, mounting seat; 2, support rod; 3, positioning ring; 4, pull rod; 5, pressing disc; 6, limiting groove; 7, base; 8, first positioning groove; 9, second positioning groove; 10, positioning pin. DETAILED DESCRIPTION

[0037] The embodiments of the present application will be described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered below.

[0038] Please refer to Figures 1-5 The present application provides a machining method of a guide mechanical combination, which fixes the guide and the sealing ring through a fixture, and then rivets the support plate with the guide.

[0039] As shown in Figures 1-2 The clamp comprises a mounting seat 1, a support rod 2, a positioning ring 3, a pull rod 4 and a compression disc 5. The positioning ring 3 is fixed on the mounting seat 1, and the support rod 2 is inserted into the mounting seat 1. The pull rod 4 is arranged in the mounting seat 1 and the compression disc 5 to adjust the distance between the mounting seat 1 and the compression disc 5. As shown in Figure 1 After the support plate and the sealing ring are riveted together, the support plate is put into the guide riveting ring from the small end of the guide. Then the guide riveting ring is supported from the other side of the guide riveting ring through the support rod 2, and the compression disc 5 is tightened through the pull rod 4 to press the compression disc 5 on the sealing ring and apply pressure to the sealing ring towards the mounting seat 1. The riveted sealing ring and support plate are pressed on the guide riveting ring, and the positioning ring 3 is used to position the sealing ring.

[0040] In operation, as shown in Figures 1-2 First, the sealing ring and the support plate are riveted together, then the support plate is brought into contact with the guide riveting ring, and finally the sealing ring, the support plate and the guide are pressed together through the support rod 2 and the compression disc 5, so that the relative positions of the guide, the sealing ring and the rivet are fixed during riveting, so that the stability of the sealing ring and the guide can be ensured during riveting of the support plate and the guide. Thus, the processing of the sealing ring inner ring spraying groove can be separated from the guide mechanical assembly, and the sealing ring inner ring spraying groove can be processed in the part state, and the sealing ring mounting edge can be directly pressed to ensure the processing precision.

[0041] Meanwhile, the number of support rods 2 is the same as the number of riveting holes on the guide riveting ring, and the positions of the support rods 2 on the mounting seat 1 correspond to the positions of the riveting holes on the guide riveting ring one by one. All the rivets can be supported by the support rods 2, without the need to repeatedly load the rivets, saving the working process and improving the support effect of the support rods 2 on the support plate and the guide during riveting.

[0042] Thus, a new guide mechanical assembly processing method is obtained, comprising:

[0043] S1, processing the sealing ring spraying groove in the part state;

[0044] S2, spraying a coating on the surface of the spraying groove, leaving a processing allowance, and riveting the sealing ring and the support plate together;

[0045] S3, aligning the riveting holes on the surface of the support plate with the riveting holes on the guide riveting ring, and inserting rivets into all the riveting holes, with the large end of the rivet facing the large end of the guide. Then the sealing ring and the guide are fixed by the clamp, and the support rod 2 of the clamp is supported on the large end of the rivet. When the guide and the sealing ring are fixed, the coaxiality between the guide and the spraying groove is ensured to meet the design requirements.

[0046] S4, rivet impact forming, complete the connection of the guide and the support plate;

[0047] S5, process the surface coating of the seal ring, and remove the clamp.

[0048] In the method, the spray groove of the inner ring of the seal ring is processed when the seal ring is in a part state, and the spray groove processing can be directly pressed against the installation edge of the seal ring when the seal ring is in a part state, so as to separate the spray groove processing from the overall guide mechanical assembly to ensure the processing accuracy. After the spray groove processing of the inner ring of the seal ring is completed, the seal ring riveted with the support plate is pressed together with the guide through the clamp, and then the riveting of the support plate and the guide is performed. In the riveting process, the rivet is supported by the support rod 2, and the guide and the seal ring are relatively stationary through the cooperation of the pressing disc 5, the positioning ring 3 and the support rod 2, so as to ensure that the coaxiality of the spray groove of the inner ring of the seal ring and the guide meets the design requirements after riveting, and the processing difficulty is reduced and the product qualification rate is improved.

[0049] Specifically, in step S3, the method of fixing the guide and the seal ring through the clamp includes the following steps:

[0050] S31, place the pressing disc 5 on the workbench to keep the pressing disc 5 horizontal, and place the support plate and the seal ring riveted in step S2 on the pressing disc 5, keeping the side of the support plate used to contact the inner riveting ring of the guide upward;

[0051] S32, place the small head of the guide downward, so that the inner riveting ring of the guide contacts the support plate, and the riveting holes opened on the surface of the inner riveting ring of the guide are aligned with the riveting holes opened on the surface of the support plate. Since the rivet needs to be impacted during riveting, and the side of the inner riveting ring of the guide facing the small head end of the guide is not blocked, the rivet needs to be impacted from the small head end of the guide. Therefore, the rivet is installed into the riveting hole from the side of the inner riveting ring of the guide facing the large head end of the guide. Placing the small head end of the guide downward allows the inner riveting ring of the guide to be placed on the support plate, which facilitates the placement of the rivet in the riveting hole opened on the inner riveting ring of the guide. The rivet can be suspended in the riveting hole under the action of gravity, and the rivet can be assembled at one time;

[0052] S33, insert the rivet into the aligned riveting holes to ensure that a rivet is inserted into each riveting hole;

[0053] S34, the support rod 2 is inserted obliquely between the support plate and the guide and the rivet and the inner riveting ring of the guide are contacted with the side away from the support plate, the positioning ring 3 is fixed with the mounting seat 1, the positioning ring 3 is set to the outer ring surface of the sealing ring for positioning, the top end of the support rod 2 is inserted into the mounting seat 1, then the pull rod 4 is threaded through the mounting seat 1 and the compression disc 5, the compression disc 5 is controlled to be close to the mounting seat 1, the compression disc is pressed to the sealing ring towards the mounting seat 5, as shown in Figure 1 , at this time, the sealing ring is clamped between the compression disc 5 and the support rod 2, the fixing of the guide, the support plate and the sealing ring is realized, and after the assembly is completed, the rivet is pressed in the riveting hole opened in the inner riveting ring of the guide through the support rod 2, the rivet is supported while preventing the rivet from falling off;

[0054] S35, the jig, the guide and the sealing ring are turned together for half a turn, the small head end of the guide is upward, the small head end of the rivet is exposed, which is convenient for subsequent riveting.

[0055] Through the above steps, the jig is fixed to the guide, the sealing ring and the support plate, and all the rivets are installed in all the riveting holes, and all the rivets can be impacted after the whole jig and parts are turned over, which improves the processing efficiency and eliminates the need for manual impact on each rivet, and improves the assembly accuracy to ensure that the mechanical combination of the guide after assembly meets the design requirements.

[0056] In the traditional scheme, since the inner ring of the guide has an installation edge, it will interfere with the riveting rod for supporting the rivet, so the riveting rod in the traditional scheme is provided with a bending part at the position for contacting the rivet, and the bending part is perpendicular to the body of the riveting rod. When the rivet is impacted, the bending part is prone to deformation. At the same time, the traditional single riveting rod has poor rigidity when supporting the rivet, which may eventually cause a gap between the rivet and the inner riveting ring of the guide or the support plate. In the design requirements of the guide mechanical combination, in order to ensure that the parts do not loosen after riveting, a 0.05mm plug gauge is used to check the fit of the rivet head and the parts, and the plug gauge should not be able to slide freely. Therefore, the riveting rod in the traditional scheme cannot meet the requirements.

[0057] In the present scheme, the support rod 2 includes a vertical section and a support section, the vertical section is perpendicular to the mounting seat 1, the support section has a preset angle with the vertical section, and the included angle between the support section and the vertical section is not less than 120°. The support section contacts the rivet, and the impact force received by the support section can be more effectively transmitted to the vertical section when the rivet is impacted. The support section and the vertical section can better provide effective support for the rivet. At the same time, the same number of support rods 2 are installed on the mounting seat 1 to support the rivets, the rigidity is improved, and the support rod 2 is prevented from deforming during the impact of the rivet, so as to ensure the installation accuracy of the rivet after installation and improve the product quality.

[0058] Specifically, the positioning ring 3 is provided with a limiting groove 6 at one end away from the mounting base 1, the limiting groove 6 has a sidewall with a diameter matched with the outer diameter of the seal ring and a bottom wall for contacting the end face of the seal ring, for sleeving the outer circular surface of the seal ring when clamping the seal ring, and when machining the inner ring spray groove of the seal ring, the coaxiality between the spray groove and the outer circle of the seal ring is not greater than 0.01 mm, thereby, the outer circle of the seal ring is positioned by the limiting groove 6, and the spray groove of the inner ring of the seal ring is indirectly positioned, because the inner ring of the seal ring is provided with a coating when the clamp clamps the seal ring, the coating surface is not finished and has a machining allowance, thereby, the positioning of the seal ring during clamping is realized by the cooperation of the limiting groove 6 and the outer circle of the seal ring, at the same time, the positioning of the seal ring by the limiting groove 6 can prevent displacement of the seal ring during riveting or turning, can ensure that the seal ring does not displace after clamping the seal ring, and ensure the machining precision;

[0059] As shown in Figure 2 , the limiting groove 6 of the seal ring can also support the seal ring when the coating is machined, when the surface coating of the seal ring is machined, the pull rod 4 and the pressing disc 5 on the overall clamp are removed first, then the small head of the guide is placed upward together with the mounting base 1, the positioning ring 3 and the supporting rod 2 on the machining platform, to support and limit the seal ring by the limiting groove 6, prevent the seal ring from vibrating during coating processing, the spraying material of the coating is generally nickel-based alloy, which has a hardness much lower than that of the high-temperature alloy material of the seal ring, the cutting force can be ignored during machining, in order to ensure that the size of the inner ring coating and the coaxiality of the outer ring reference |Φ0.05|A, and considering that the coating machining allowance is small and the hardness is low, the coating is still retained after assembly for machining.

[0060] As shown in Figures 1-2 , the clamp further comprises a base 7, the base 7 is provided with a first positioning groove 8 for placing the pressing disc 5 and a second positioning groove 9 for placing the mounting base 1, the first positioning groove 8 is used for positioning the pressing disc 5, and the second positioning groove 9 is used for positioning the mounting base 1, in steps S31-S34, the pressing disc 5 is placed in the first positioning groove 8 of the base 7 to position and fix the pressing disc 5, preventing the pressing disc 5 from moving during subsequent clamp assembly, and in step S35, after the clamp is turned over with the small head end of the guide upward, the mounting base 1 in the clamp serves as a support and contacts the base 7 to support the overall clamp, the second positioning groove 9 is provided on the base 7 to position the mounting base 1, so as to ensure that the overall clamp does not move during impact riveting, and ensure the stability during impact.

[0061] Further, as shown in Figure 2As shown, one side of the base 7 provided with the second positioning slot 9 is fixedly provided with a positioning pin 10, which is used for contacting the outer ring surface of the large end of the guide to position the guide. After the clamp is assembled, the coaxiality between the guide and the spraying slot between the inner ring of the sealing ring needs to be determined to meet the requirements. After the clamp is turned over and the sealing ring, the mounting plate and the guide are clamped by the clamp, the mounting seat 1 in the clamp is clamped into the second positioning slot 9 to position the clamp, and the positioning ring 3 in the clamp can position the sealing ring. In this way, the position of the sealing ring can be determined, the positioning pin 10 will contact the outer ring surface wall of the large end of the guide, the second positioning slot 9 is a circular ring, and the shape of the part of the mounting seat 1 inserted into the second positioning slot 9 matches the shape of the second positioning slot 9. That is, the overall clamp can drive the guide to rotate on the base 7, the rotation axis is the axis of the second positioning slot 9, and the rotation axis coincides with the axis of the sealing ring. During the rotation of the guide driven by the clamp, unless the guide and the sealing ring are coaxial, under normal circumstances, the contact position of the outer ring surface of the guide with the positioning pin 10 will change with the distance from the rotation axis as the angle changes during the rotation. If the coaxiality of the guide and the sealing ring exceeds the design requirement, interference will occur between the guide and the positioning pin 10 during the rotation of the guide, so that the resistance of the guide during the rotation is increased. Therefore, whether the coaxiality of the guide and the sealing ring after being clamped by the clamp meets the requirements can be determined.

[0062] As shown in Figures 1-2 In some examples, the first positioning slot 8 is conical, and the compression disc 5 also has a conical portion. The compression disc 5 is clamped into the first positioning slot 8 through the conical portion to realize the positioning of the compression disc 5.

[0063] As shown in Figures 1-2 In some examples, the mounting seat 1 is provided with a plug-in hole, and the vertical section of the support rod 2 is fixedly provided with a plug-in part. The support rod 2 is assembled with the mounting seat 1 through plug-in cooperation of the plug-in part and the plug-in hole of the mounting seat 1.

[0064] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A guide mechanical assembly machining method, characterized in that: a clamp is used to fix the seal ring, support plate and guide, the clamp comprising a mounting seat (1), a support rod (2), a positioning ring (3), a pull rod (4) and a pressing disc (5), the positioning ring (3) is fixed on the mounting seat (1), the support rod (2) is inserted into the mounting seat (1), the pull rod (4) is inserted into the mounting seat (1) and the pressing disc (5) for adjusting the distance between the mounting seat (1) and the pressing disc (5), after the support plate and the seal ring are riveted together, the support plate is put into the guide from the small end of the guide to the riveting ring, then the support rod (2) supports the riveting ring from the other side of the riveting ring in the guide, and the pull rod (4) tightens the pressing disc (5) to press the pressing disc (5) on the seal ring to apply pressure to the seal ring towards the mounting seat (1), so as to press the riveted seal ring and support plate on the riveting ring in the guide, the positioning ring (3) is used to contact the outer ring surface of the seal ring to position the seal ring; the guide mechanical assembly machining method comprises the following steps: S1, machining the seal ring spray groove in the part state; S2, spraying a coating on the surface of the spray groove, leaving a machining allowance, and riveting the seal ring and the support plate together; S3, aligning the riveting holes opened on the surface of the support plate with the riveting holes opened on the riveting ring in the guide, and inserting rivets into all the riveting holes, the big end of the rivet facing the big end of the guide, then fixing the seal ring and the guide by the clamp, the support rod (2) in the clamp supporting the big end of the rivet; S4, impact forming the rivet to complete the connection of the guide and the support plate; S5, machining the surface coating of the seal ring, and removing the clamp.

2. A method of machining a guide mechanism according to claim 1, wherein: In step S3, the clamp fixes the seal ring and the guide as follows: S31, place the pressing disc (5) on the workbench to keep the pressing disc (5) horizontal, place the support plate and the seal ring riveted in step S2 on the pressing disc (5), and keep the side of the support plate for contacting the riveting ring in the guide upward; S32, place the small end of the guide downward, make the riveting ring in the guide contact the support plate, and align the riveting holes opened on the surface of the riveting ring in the guide with the riveting holes opened on the surface of the support plate; S33, insert the rivets into the aligned riveting holes, and ensure that there is a rivet in each riveting hole; S34, insert the support rod (2) obliquely between the support plate and the guide to contact the side of the rivet and the riveting ring in the guide away from the support plate, fix the positioning ring (3) and the mounting seat (1) together, then make the positioning ring (3) downwardly fit to the outer ring surface of the seal ring to position the seal ring, and insert the top end of the support rod (2) into the mounting seat (1), then insert the pull rod (4) through the mounting seat (1) and the pressing disc (5) to screw, and control the pressing disc (5) to approach the mounting seat (1) to apply pressure to the seal ring towards the mounting seat (1); S35, turn over the clamp, the guide and the seal ring together by half a circle to make the small end of the guide upward.

3. The method of claim 1 wherein: The positioning ring (3) is provided with a limiting groove (6) at one end away from the mounting base (1), the limiting groove (6) has a sidewall with a diameter matching the outer diameter of the sealing ring and a bottom wall for contacting the end face of the sealing ring.

4. The method of claim 1 wherein: In step S5, when the surface coating of the sealing ring is processed, the pull rod (4) and the pressing disc (5) on the whole clamp are removed first, then the guide small head is placed upward together with the mounting base (1), the positioning ring (3) and the support rod (2) on the processing platform, so as to support and limit the sealing ring through the limiting groove (6) on the positioning ring (3).

5. The method of claim 1 wherein: In step S1, when the spraying groove is processed, the coaxiality of the spraying groove relative to the outer circle of the sealing ring is not greater than 0.01mm.

6. The method of claim 1 wherein: The clamp further comprises a base (7), the base (7) is provided with a first positioning groove (8) for placing and positioning the pressing disc (5) and a second positioning groove (9) for placing and positioning the mounting base (1).

7. A method of machining a guide mechanism according to claim 6, wherein: One side of the base (7) provided with the second positioning groove (9) is fixedly provided with a positioning pin (10), the positioning pin (10) is used for contacting the outer ring surface of the large head end of the guide to position the guide.

8. The method of claim 6, wherein: The second positioning groove (9) is a circular ring, and the shape of the part of the mounting base (1) inserted into the second positioning groove (9) matches the shape of the second positioning groove (9).

9. The method of claim 1 wherein: The support rod (2) comprises a vertical section for connecting with the mounting base (1) and a support section for supporting the rivet, the vertical section is perpendicular to the mounting base (1), there is a preset angle between the support section and the vertical section, and the included angle between the support section and the vertical section is not less than 120°.

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