A processing tooling for a waveform end face seal ring and its processing method

Abstract

A processing tool for a waveform end face sealing ring, comprising a sealing ring blank to be processed, a lever-type structure for deforming the end face of the sealing ring blank into a waveform surface, and a positioning disk for positioning the lever-type structure; a plurality of grooves evenly distributed along the circumferential direction are provided on the outer peripheral wall of the sealing ring blank to be processed, and a fixed wall is provided between adjacent grooves; a positioning disk is provided below the sealing ring blank, the area of the positioning disk is larger than the area of the sealing ring blank, and positioning holes corresponding to the grooves one by one are provided on the positioning disk and outside the sealing ring blank; the lever-type structure includes an upper lever arm, a lower lever arm, a support block and a loading bolt, and the upper lever arm and the lower lever arm are hinged through the support block; a loading bolt is provided on the second horizontal section of the upper lever arm and the fourth horizontal section of the lower lever arm, and the tail end of the loading bolt passes through the positioning hole on the positioning disk. The present invention also provides a processing method for the processing tool of the waveform end face sealing ring. The present invention has the characteristics of low equipment investment, high economy, simple structure and convenient operation.

Description

Technical Field

[0001] The present invention relates to a processing tool for a waveform end face seal ring and a processing method thereof. Background Art

[0002] Waveform end face mechanical seal is a kind of non-contact mechanical seal form. The end face of its dynamic ring or static ring is composed of a flat sealing dam and a continuously changing corrugated surface. The intersection curve of the sealing dam and the corrugated surface is a closed wavy line extending along the circumferential direction. When paired with another flat seal ring, a corrugated gap is formed circumferentially and a convergent gap is formed radially at the sealing interface. The advantages of waveform end face seal are that the hydrostatic pressure effect generated by the radial convergent gap ensures that there is always a liquid film between the two sealing interfaces during shutdown and operation, and the hydrodynamic pressure effect generated by the circumferential corrugated gap ensures sufficient opening force to separate the two sealing end faces, while the sealing dam enhances the leakage control ability. Waveform end face seal relies on the hydrostatic and hydrodynamic effects to achieve the purpose of improving reliability and service life, and is widely used in important occasions such as high pressure and high speed.

[0003] Compared with other forms of seal structures, waveform end face mechanical seal has unique structural characteristics: the end face wave amplitude is only about 10μm, the inclination angle between the corrugated surface and the sealing dam is only about 0.05°, and the surface roughness needs to reach R a 0.05μm. To meet the long-term working requirements of the seal ring under high parameter conditions, its material must have the characteristics of high stiffness, high hardness and high thermal stability, and generally hard-to-machine materials with high hardness such as tungsten carbide, silicon carbide, and silicon nitride are selected, so its precision manufacturing is extremely difficult. Therefore, efficiently and accurately realizing the processing of the waveform of the seal end face has important research significance and value for ensuring the reliable operation of the seal.

[0004] At present, the main processing methods for seal end faces widely used in engineering are grinding method, laser processing method and pre-deformation grinding method. The pre-deformation grinding method was first proposed in the US patent (Patent No. US005947481) published on September 7, 1999, and the inventor is Lione A. Young. The basic principle of this processing method is: after the heating fixture expands, the seal ring is put in. After the fixture cools down, the axial elastic deformation of the seal end face is generated by the interference fit between the fixture and the seal ring, and the convex deformation area of the end face is ground and removed. After the fixture is removed, the seal end face presents a waveform surface mirror-imaged to the pre-deformation. This method is feasible in principle, but it is difficult to adjust after the fixture cools down, and it is difficult to remove the seal ring blank after processing. To achieve practical application, improvement is needed. Summary of the Invention

[0005] In view of the defects of the above-mentioned pre-deformation method fixture loading method, in order to facilitate actual loading, the present invention proposes a loading tool for the pre-deformation method of a sealing ring with high economy, simple and efficient operation, and controllable waveform. By using this tooling, the sealing ring is in a reasonable deformed state, and a waveform end face sealing ring can be machined by using a surface grinding machine.

[0006] The first aspect of the present invention provides a processing tool for a waveform end face sealing ring, including a sealing ring blank to be processed, a lever structure for deforming the end face of the sealing ring blank into a waveform surface, and a positioning disk for positioning the lever structure; a plurality of grooves evenly distributed in the circumferential direction are provided on the outer peripheral wall of the sealing ring blank to be processed, and a fixed wall is provided between adjacent grooves; a positioning disk is provided below the sealing ring blank, the area of the positioning disk is larger than the area of the sealing ring blank, and positioning holes corresponding to the grooves one by one are provided on the positioning disk and outside the sealing ring blank;

[0007] The lever structure includes an upper lever arm, a lower lever arm, a support block and a loading bolt. The upper lever arm includes a first horizontal section, an upward inclined section and a second horizontal section connected in sequence. The lower lever arm includes a third horizontal section, a downward inclined section and a fourth horizontal section connected in sequence. The first horizontal section of the upper lever arm and the third horizontal section of the lower lever arm are arranged in the grooves of the sealing ring blank; an arc-shaped groove with a relative depression is provided at the position of the first horizontal section of the upper lever arm close to the upward inclined section and the position of the third horizontal section of the lower lever arm close to the downward inclined section. The support block is arranged in the arc-shaped grooves of the upper lever arm and the lower lever arm, and the upper lever arm and the lower lever arm are hinged through the support block; corresponding threaded holes are provided on the second horizontal section of the upper lever arm and the fourth horizontal section of the lower lever arm, and the loading bolt passes through the threaded holes to connect the upper lever arm and the lower lever arm. The tail end of the loading bolt passes through the positioning holes on the positioning disk to realize the positioning of the lever structure;

[0008] The lever structure has a pre-tightening state and a loading state. In the pre-tightening state, a pre-tightening force is applied to the loading bolt. The first horizontal section of the upper lever arm is closely attached to the upper side in the groove of the sealing ring blank, and the third horizontal section of the lower lever arm is closely attached to the lower side in the groove of the sealing ring blank. The upper lever arm and the lower lever arm clamp the sealing ring blank; in the loading state, the loading bolt is rotated, and the upper lever arm and the lower lever arm generate a force on the end face of the sealing ring blank, so that the end face of the sealing ring blank forms a waveform surface deformation.

[0009] Furthermore, it further includes a torque wrench, and a pre-tightening force is applied to the loading bolt by pre-setting the torque through the torque wrench.

[0010] The second aspect of the present invention provides a processing method for a processing tool of a waveform end face sealing ring, including the following steps:

[0011] Step 1, grind the working surface and the base surface of the sealing ring blank to make the working surface and the base surface flat and meet the requirements of form and position tolerances and flatness;

[0012] Step 2: Utilize the cooperation of the upper lever arm, lower lever arm, support block, positioning disc and the blank sealing ring, and adopt a clamping method to apply a deformation torque; Use a torque wrench to preset the torque and apply a pre-tightening force to the loading bolts at the tails of the upper and lower lever arms. The heads of the upper and lower lever arms generate an up-and-down pre-tightening force on the blank sealing ring, causing the upper and lower end faces of the blank sealing ring to produce a convex deformation, forming a wavy end face.

[0013] Step 3: Use a surface grinding machine to perform surface grinding on the wavy surface deformation of the end face of the blank sealing ring.

[0014] Step 4: After the processing is completed, loosen the loading bolts, remove the upper and lower lever arms, and the end face of the blank sealing ring restores elastic deformation, forming a wavy end face that is in a mirror state with the wavy end face in Step 2.

[0015] The beneficial effects of the present invention are as follows:

[0016] (1) According to the processing principle of the pre-deformation method, a set of lever-type structures are evenly distributed circumferentially on the sealing ring. The middle parts of the two lever arms are connected by a hinge, and the tails of the upper and lower lever arms are connected by loading bolts. The bottom surface of the blank sealing ring is provided with a positioning disc to fix the loading position. A pre-tightening force is applied to the loading bolts by presetting the torque with a torque wrench, causing the end face of the sealing ring clamped by each lever arm to produce an axial deformation, and the end face of the sealing ring generates a convexity to form a uniformly distributed wavy surface. By using a surface grinding machine to grind off the convex part and removing the tooling, a desired wavy end face sealing ring can be obtained. This tooling is applied to the pre-deformation loading of the wavy end face sealing ring, and has the characteristics of low equipment investment, high economy, simple structure and convenient operation.

[0017] (2) Compared with extruding different points on the outer cylindrical surface of the blank sealing ring, the method of adopting an outward clamping method to apply a greater pre-tightening force makes it easier for the sealing ring to generate a wavy deformation, and a sealing dam area is formed in the inner diameter side area that has not undergone deformation. This method of adjusting the deformation of the blank sealing ring through the loading bolts is convenient for disassembly and assembly, and a wavy sealing end face with high surface quality and controllability can be obtained. Description of the Drawings

[0018] Figure 1 is the structure of the wavy sealing ring of the present invention.

[0019] Figure 2 is the axonometric view of the blank sealing ring.

[0020] Figure 3a is the sectional view of the processing of the blank sealing ring.

[0021] Figure 3b is the top view of the processing of the blank sealing ring.

[0022] Figure 4a is the front view of the lever arm tooling

[0023] Figure 4b It is the top view of the lever arm tooling.

[0024] Figure 5 It is the isometric view of the positioning disk.

[0025] Figure 6 It is the isometric view of the present invention.

[0026] Explanation of reference numerals in the drawings: 1. Sealing ring blank; 2. Upper lever arm; 3. Lower lever arm; 4. Support block; 5. Loading bolt; 6. Positioning disk; 7. Wavy surface; 8. Ring plane dam area; 9. Fixed wall. Detailed implementation manners

[0027] Next, the technical solutions of the present invention patent will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention. In addition, if terms such as "first", "second", "third" are used only for descriptive purposes, they cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, if terms such as "installation", "connection", "connection" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] Referring to the accompanying drawings, a first aspect of the present invention provides a processing tool for a waveform end face sealing ring, which includes a sealing ring blank 1 to be processed, a lever-type structure for deforming the end face of the sealing ring blank 1 into a waveform surface, and a positioning disk 6 for positioning the lever-type structure; a plurality of grooves evenly distributed in the circumferential direction are provided on the outer peripheral wall of the sealing ring blank 1 to be processed, and a fixed wall 9 is provided between adjacent grooves; a positioning disk 6 is provided below the sealing ring blank 1, the area of the positioning disk 6 is larger than the area of the sealing ring blank 1, and positioning holes corresponding to the grooves one by one are provided on the positioning disk 6 and located outside the sealing ring blank 1;

[0031] The lever-type structure includes an upper lever arm 2, a lower lever arm 3, a support block 4 and a loading bolt 5. The upper lever arm 2 includes a first horizontal section, an upward inclined section and a second horizontal section connected in sequence. The lower lever arm 3 includes a third horizontal section, a downward inclined section and a fourth horizontal section connected in sequence. The first horizontal section of the upper lever arm 2 and the third horizontal section of the lower lever arm 3 are arranged in the groove of the sealing ring blank 1; at a position where the first horizontal section of the upper lever arm 2 is close to the upward inclined section and a position where the third horizontal section of the lower lever arm 3 is close to the downward inclined section, there are relatively sunken arc grooves. The support block 4 is arranged in the arc grooves of the upper lever arm 2 and the lower lever arm 3, and the upper lever arm 2 and the lower lever arm 3 are hinged through the support block 4; corresponding threaded holes are provided on the second horizontal section of the upper lever arm 2 and the fourth horizontal section of the lower lever arm 3. The loading bolt 5 passes through the threaded holes to connect the upper lever arm 2 and the lower lever arm 3, and the tail end of the loading bolt 5 passes through the positioning hole on the positioning disk 6 to realize the positioning of the lever-type structure;

[0032] The lever-type structure has a pre-tightening state and a loading state. In the pre-tightening state, a pre-tightening force is applied to the loading bolt 5. The first horizontal section of the upper lever arm 2 closely adheres to the upper side in the groove of the sealing ring blank 1, and the third horizontal section of the lower lever arm 3 closely adheres to the lower side in the groove of the sealing ring blank 1. The upper lever arm 2 and the lower lever arm 3 clamp the sealing ring blank 1; in the loading state, the loading bolt 5 is rotated, and the upper lever arm 2 and the lower lever arm 3 generate a force on the end face of the sealing ring blank 1, causing the end face of the sealing ring blank 1 to form a waveform surface deformation.

[0033] Further, it also includes a torque wrench. A pre-tightening force is applied to the loading bolt 5 by presetting the torque through the torque wrench to form a controllable waveform end face. This method of controllable waveform was proposed in a Chinese patent (Patent No. CN103029037A) published on April 10, 2013. The specific implementation method is to apply a pre-tightening force to the loading bolt, and continuously detect the flatness change of each point on the end face by using a flat crystal interference or an optical axis method. When the surface waveform surface meets the requirements, stop loading.

[0034] A second embodiment of the present invention provides a processing method for a processing tool for a waveform end face sealing ring, as Figure 1As shown in the figure, a waveform end face seal ring to be processed by the present invention is composed of a waveform area formed by nine uniformly distributed waveform faces 7 on its surface and a circular ring plane dam area 8. The outer circles of each wavy face are connected end to end with adjacent waveform faces in sequence, and the top of the wavy face 7 is connected to the dam area 8.

[0035] As Figure 2 shown in the figure, a seal ring blank to be processed used in the present invention has nine annular grooves on its outer side, and there are fixed walls 9 between the grooves.

[0036] The specific processing method includes the following steps:

[0037] Step 1: Use a surface grinding machine to grind the working surface and the base surface of the seal ring blank, so that the working surface and the base surface are ground flat to meet the requirements of geometric tolerance and flatness.

[0038] Step 2: Utilize the cooperation of the upper lever arm 2, the lower lever arm 3, the support block 4 and the seal ring blank. The loading bolt 5 passes through the threaded holes at the tails of the upper and lower lever arms for connection, so that the head of the upper lever arm 2 closely adheres to the upper part of the groove on the outer side of the seal ring blank 1, and the head of the lower lever arm 3 closely adheres to the lower part of the groove on the outer side of the seal ring blank 1. The positioning disk 6 has nine uniformly distributed positioning holes, which correspond to the loading tooling one by one to achieve positioning. Use a torque wrench to preset the torque to apply a pre-tightening force to the loading bolt at the tail of the lever arm. The head of the lever arm generates an outward expanding pre-tightening force on the seal ring blank 1, and the upper and lower end faces of the seal ring blank 1 generate convex deformation to form a wavy end face. By changing the pre-tightening force of the loading bolt 5, the waveform deformation of the end face of the seal ring blank 1 can be adjusted.

[0039] Step 3: Use a surface grinding machine to perform surface grinding on the convex wavy end face of the seal ring blank 1.

[0040] Step 4: After grinding, loosen the loading bolt 5, remove the upper lever arm 2 and the lower lever arm 3. The end face of the seal ring blank restores elastic deformation to form a wavy end face that is in a mirror state with the second step, which is the waveform area, and the inner diameter side plane area that has not undergone deformation is the dam area.

[0041] The specific working principle is as follows: By rotating the loading bolt, the lever arm can generate an outward acting force on the seal ring blank, causing partial convex deformation of the seal ring blank. The upper and lower lever arms arranged axially and uniformly applying the same force will cause waveform surface deformation of the seal ring blank. By controlling the loading bolt, an ideal waveform surface deformation can be obtained.

[0042] The content described in the embodiments of this specification is only a listing of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the present invention also extends to equivalent technical means that those skilled in the art can think of according to the inventive concept of the present invention.

Claims

1. A processing tooling for a waveform end face seal ring, characterized in that: It includes a sealing ring blank (1) to be processed, a lever - type structure for deforming the end face of the sealing ring blank (1) into a corrugated surface, and a positioning disk (6) for positioning the lever - type structure; a plurality of grooves evenly distributed in the circumferential direction are provided on the outer peripheral wall of the sealing ring blank (1) to be processed, and a fixed wall (9) is provided between adjacent grooves; a positioning disk (6) is provided below the sealing ring blank (1), the area of the positioning disk (6) is larger than that of the sealing ring blank (1), and positioning holes corresponding to the grooves one by one are provided on the positioning disk (6) and located outside the sealing ring blank (1). The lever - type structure includes an upper lever arm (2), a lower lever arm (3), a support block (4), and a loading bolt (5). The upper lever arm (2) includes a first horizontal section, an upward - inclined section, and a second horizontal section connected in sequence. The lower lever arm (3) includes a third horizontal section, a downward - inclined section, and a fourth horizontal section connected in sequence. The first horizontal section of the upper lever arm (2) and the third horizontal section of the lower lever arm (3) are arranged in the grooves of the sealing ring blank (1); at the position where the first horizontal section of the upper lever arm (2) is close to the upward - inclined section and the position where the third horizontal section of the lower lever arm (3) is close to the downward - inclined section, there are relatively sunken arc - shaped grooves. The support block (4) is arranged in the arc - shaped grooves of the upper lever arm (2) and the lower lever arm (3), and the upper lever arm (2) and the lower lever arm (3) are hinged through the support block (4); corresponding threaded holes are provided in the second horizontal section of the upper lever arm (2) and the fourth horizontal section of the lower lever arm (3), and the loading bolt (5) passes through the threaded holes to connect the upper lever arm (2) and the lower lever arm (3). The tail end of the loading bolt (5) passes through the positioning holes on the positioning disk (6) to realize the positioning of the lever - type structure. The lever - type structure has a pre - tightening state and a loading state. In the pre - tightening state, a pre - tightening force is applied to the loading bolt (5). The first horizontal section of the upper lever arm (2) closely adheres to the upper side in the groove of the sealing ring blank (1), and the third horizontal section of the lower lever arm (3) closely adheres to the lower side in the groove of the sealing ring blank (1). The upper lever arm (2) and the lower lever arm (3) clamp the sealing ring blank (1); in the loading state, the loading bolt (5) is rotated, and the upper lever arm (2) and the lower lever arm (3) generate acting forces on the end face of the sealing ring blank (1), causing the end face of the sealing ring blank (1) to form a corrugated surface deformation.

2. The processing tooling for a waveform end face seal ring as described in claim 1, characterized in that: It also includes a torque wrench, and a pre - tightening force is applied to the loading bolt (5) by presetting the torque with the torque wrench.

3. The processing method of a waveform end face seal ring processing tooling according to claim 2, characterized in that, It includes the following steps: Step 1, grind the working surface and the base surface of the sealing ring blank to make the working surface and the base surface flat and meet the requirements of geometric tolerance and flatness. Step 2, utilize the cooperation of the upper lever arm, the lower lever arm, the support block, the positioning disk and the sealing ring blank, and apply a deformation torque in a clamping manner. Use the torque wrench to preset the torque and apply a pre - tightening force to the loading bolts at the tails of the upper lever arm and the lower lever arm. The heads of the upper lever arm and the lower lever arm generate upper and lower pre - tightening forces on the sealing ring blank, and the upper and lower end faces of the sealing ring blank generate convex deformations to form a wavy end face. Step 3, use a surface grinding machine to perform surface grinding on the corrugated surface deformation of the upper end face of the sealing ring blank. Step 4, after processing, loosen the loading bolt, remove the upper lever arm and the lower lever arm, and the end face of the sealing ring blank restores elastic deformation to form a wavy end face with a mirror-image state at the lower end face.

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