Production process of ultrahigh pressure equalizing ring

Abstract

The application relates to the field of voltage-sharing rings, and particularly discloses a production process of an ultrahigh-voltage voltage-sharing ring, which comprises the following steps: S1 primary forming: raw materials are arranged in a first cavity of a forming die, heat compression forming is carried out, and a half-ring piece is obtained after demolding; S2 secondary forming: two ends of the half-ring piece are arranged in a second cavity of the forming die, raw materials are arranged in the second cavity of the forming die, heat compression forming is carried out, and a ring body is obtained after demolding; S3 surface polishing: the surface of the ring body is polished; and S4 assembly welding: the ring body subjected to the surface polishing in S3 is welded and fixed with a connecting piece, so that the ultrahigh-voltage voltage-sharing ring is obtained. According to the application, a set of forming dies can be used to complete the production and manufacturing of the ring body, the production efficiency is high, and the production cost is low.

Description

Technical Field

[0001] This application relates to the field of equalizing rings, and in particular to a manufacturing process for an ultra-high pressure equalizing ring. Background Technology

[0002] As an important component of the power grid, the equalizing ring is suitable for AC voltage. It can evenly distribute high voltage around an object, ensuring that there is no potential difference between different parts of the ring, thus achieving the effect of voltage equalization. Ultra-high voltage equalizing rings are specifically designed for ultra-high voltage power systems and consist of a ring body and connecting components.

[0003] Chinese patent CN111933368A discloses a manufacturing process for an annular equalizing ring, comprising the following steps: a casting step, in which various raw materials are proportioned and hot-pressed to obtain a pair of half-rings; a splicing and fixing step, in which the pair of half-rings are spliced ​​to obtain a complete equalizing ring blank; a grinding and polishing step, in which the surface of the equalizing ring is ground and polished to remove surface burrs; and a center calibration step, in which the equalizing ring is fitted onto a calibration device for center calibration, thus completing the process.

[0004] The above-mentioned production process is suitable for producing large-sized ultra-high pressure equalizing rings, but it still has the following technical defects: the splicing and fixing step generally adopts a welding process to make the two half rings form a ring body, which results in low production efficiency. Summary of the Invention

[0005] To improve the production efficiency of ultra-high pressure equalizing rings, this application provides a production process for ultra-high pressure equalizing rings.

[0006] The manufacturing process for an ultra-high pressure equalizing ring provided in this application adopts the following technical solution:

[0007] A manufacturing process for an ultra-high voltage equalizing ring includes the following steps:

[0008] S1 One-time molding: The raw material is placed in the first cavity of the molding die, and hot-pressed to form a semi-ring after demolding;

[0009] S2 secondary molding: Place both ends of the semi-ring in the second cavity of the molding mold, then place the raw material in the second cavity of the molding mold, perform hot pressing molding, and obtain the ring after demolding;

[0010] S3 Surface Polishing: Polishing the surface of the ring;

[0011] S4 Assembly and Welding: The ring body, which has been polished by S3, is welded and fixed to the connector to obtain the ultra-high pressure equalizing ring.

[0012] By adopting the above technical solution, the other half is hot-pressed from the half-ring to obtain a complete ring. Compared with welding, this method has two advantages: first, it has higher production efficiency, as the other half can be formed at the same time as the first half-ring, meaning that the initial forming (S1) and the secondary forming (S2) can be performed simultaneously, significantly shortening production time; second, it has lower production costs, as the same set of forming molds can be used to complete the ring manufacturing without the need for additional welding equipment.

[0013] Optionally, in the one-time molding of S1 and the two-time molding of S2, the raw materials include the following components by weight: 85-90 parts aluminum alloy, 3-8 parts graphite, 2-6 parts phenolic resin, and 1-3 parts nano titanium dioxide.

[0014] By adopting the above technical solutions, the ring body is made of aluminum alloy, which has the advantages of being lightweight, high-strength, and easy to process. Graphite can reduce the friction between the aluminum alloy and the forming mold, slow down mold damage, and improve the surface finish of the aluminum alloy. Phenolic resin, as an adhesive material, is beneficial for the hot pressing of the semi-ring and the ring body. Nano-titanium dioxide can improve the overall performance of the alloy, which is beneficial for ring manufacturing.

[0015] Optionally, in the one-time molding of S1 and the two-time molding of S2, the pressure is 15-30 MPa and the temperature is 180-220℃.

[0016] Optionally, the semi-ring component includes a semi-ring body and a connecting portion connected to both ends of the semi-ring body. One side of the connecting portion is configured as an arc-shaped surface, and the other side is configured as a first inclined surface, a plane, and a second inclined surface in sequence along the direction away from the semi-ring body. The arc-shaped surface is connected to the surface of the semi-ring body, and both the first inclined surface and the second inclined surface are set away from the arc-shaped surface.

[0017] By adopting the above technical solution, the contact surface area of ​​the connecting part is large, which is conducive to improving the bonding strength between the other half ring and the half ring part formed by the second cavity, thereby ensuring the quality of the ring body.

[0018] Optionally, the molding die includes an upper die and a lower die. The first cavity and the second cavity are both disposed on the upper side of the lower die. The upper die is connected to a first core inserted into the first cavity and a second core inserted into the second cavity. The first cavity and the second cavity have the same arcuate orientation. The second cavity includes a cavity body and an insertion port communicating with both ends of the cavity body. The insertion port extends through to the side wall of the lower die and is used for inserting the end of the semi-ring body.

[0019] By adopting the above technical solution, the rational distribution of the first and second cavities helps to reduce the volume of the molding die, thereby lowering production costs. Furthermore, the insertion port can also position the semi-ring body, ensuring smooth ring molding.

[0020] Optionally, a support base is provided on one side of the lower mold, and a support groove is provided at the upper end of the support base for the middle part of the semi-ring to be inserted.

[0021] By adopting the above technical solution, the support base can support the semi-ring part, which facilitates the ring forming.

[0022] Optionally, a horizontal bar is connected to the side of the support base near the lower mold, and inserts are connected to both ends of the horizontal bar. The lower mold is provided with slots for inserts to be inserted. The two slots are located on both sides of the first cavity. Both ends of the first cavity are provided with core-pulling parts that fit with the connecting part. The lower mold is provided with a sliding groove for core-pulling to slide. The sliding groove communicates with the slots, and the inserts abut against the side wall of the core-pulling part.

[0023] By adopting the above technical solution, after mold separation, the core puller slides away from the first cavity along the slide groove, which can create a gap between the connecting part and the inner wall of the first cavity, so as to facilitate the demolding of the semi-ring part.

[0024] Optionally, the upper side of the insert is provided with a through groove for inserting the core, the inner wall of the end of the through groove away from the crossbar is provided with a third inclined surface, the core is provided with a fourth inclined surface that cooperates with the third inclined surface, and a tension spring is connected between the inner wall of the end of the slide away from the first cavity and the core, the tension spring being located on the upper side of the insert.

[0025] By adopting the above technical solution, after the mold is separated, the ring body is first removed from the lower mold, and then the support seat is pushed close to the lower mold until the core pull is aligned with the through groove. Under the action of the tension spring, the core pull moves away from the first cavity to facilitate the demolding of the half ring.

[0026] Optionally, the support base is threadedly connected to a screw rod, the screw rod is rotatably connected to the lower mold, and a handwheel is connected to the end of the screw rod away from the lower mold.

[0027] By adopting the above technical solution, turning the handwheel can move the support seat closer to or away from the lower mold, which is more labor-saving.

[0028] Optionally, when the insert abuts against the inner wall of the slot at the end away from the crossbar, the third inclined surface contacts the fourth inclined surface.

[0029] By adopting the above technical solution, the problem of the insert moving too far and being unable to push the core back into the first cavity can be avoided.

[0030] In summary, this application has the following beneficial effects:

[0031] 1. This application uses a single molding die to complete the production of the ring, which is highly efficient and low in cost.

[0032] 2. The optimized raw materials and process parameters are conducive to improving the quality of the ultra-high pressure equalizing ring and extending its service life. Attached Figure Description

[0033] Figure 1 This is a schematic flowchart of the manufacturing process of the ultra-high voltage equalizing ring according to an embodiment of this application;

[0034] Figure 2 This is a schematic diagram of the structure of the semi-ring component according to an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the molding die from a first-view perspective, representing an embodiment of this application.

[0036] Figure 4 This is a schematic diagram of the molding die from a second perspective according to an embodiment of this application;

[0037] Figure 5 This is a schematic diagram of the lower mold structure according to an embodiment of this application;

[0038] Figure 6 This is a structural schematic diagram of the support base, crossbar, insert, and core puller according to an embodiment of this application.

[0039] Explanation of reference numerals in the attached drawings: 1. Semi-ring; 11. Semi-ring body; 12. Connecting part; 121. Arc-shaped surface; 122. First inclined surface; 123. Plane; 124. Second inclined surface; 2. Upper mold; 21. First core; 22. Second core; 3. Lower mold; 31. First cavity; 32. Second cavity; 321. Cavity; 322. Insert; 33. Slot; 34. Slide; 4. Support base; 41. Support groove; 5. Horizontal bar; 6. Insert bar; 61. Through groove; 62. Third inclined surface; 7. Core pulling; 71. Fourth inclined surface; 8. Tension spring; 9. Screw; 10. Handwheel. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0041] This application discloses a manufacturing process for an ultra-high voltage equalizing ring.

[0042] Reference Figure 1 The manufacturing process of ultra-high pressure equalizing rings includes the following steps:

[0043] Preparation of materials: By weight, mix 85-90 parts aluminum alloy, 3-8 parts graphite and 2-6 parts phenolic resin evenly, grind them to a fineness of less than 300 mesh, add 1-3 parts nano titanium dioxide with an average particle size of 50nm, mix evenly, and dry to obtain the raw material.

[0044] S1 One-time molding: The raw material is placed in the first cavity 31 of the molding die and hot-pressed. The pressure is 15-30MPa and the temperature is 180-220℃. After demolding, a semi-ring part 1 is obtained.

[0045] S2 Secondary Molding: Place both ends of the semi-ring 1 into the second cavity 32 of the molding die, then place the raw material into the second cavity 32 of the molding die, and perform hot pressing molding with a pressure of 15-30MPa and a temperature of 180-220℃. After demolding, a ring body is obtained.

[0046] S3 Surface Polishing: Polishing the surface of the ring;

[0047] S4 Assembly and Welding: The ring body, which has been polished by S3, is welded and fixed to the connector to obtain the ultra-high pressure equalizing ring.

[0048] It should be noted that the structure of the connector is existing technology and depends on the specific application scenario of the equalizing ring.

[0049] Reference Figure 2 The semi-ring 1 includes a semi-ring body 11 and connecting portions 12 integrally formed at both ends of the semi-ring body 11. The semi-ring body 11 is C-shaped and has a circular vertical cross-section. One side of the connecting portion 12 is provided with an arc-shaped surface 121, and the other side is provided with a first inclined surface 122, a plane 123, and a second inclined surface 124 in sequence along the direction away from the semi-ring body 11. The arc-shaped surface 121 is connected to the surface of the semi-ring body 11, and the first inclined surface 122 and the second inclined surface 124 are both set away from the arc-shaped surface 121.

[0050] Reference Figure 3 , Figure 4 The molding die includes an upper die 2 and a lower die 3. The lower die 3 is provided with a first cavity 31 for molding a semi-ring 1 and a second cavity 32 for molding the other semi-ring. The upper die 2 is fixedly connected with a first core 21 for inserting into the first cavity 31 and a second core 22 for inserting into the second cavity 32. The molding die is used with a four-column molding hydraulic press. After the powder raw material is placed in the cavity, it is cast into shape by heating and extrusion.

[0051] Reference Figure 3 The first cavity 31 and the second cavity 32 have the same arc orientation, and the second cavity 32 is located in front of the first cavity 31 to facilitate the placement of the semi-ring 1.

[0052] Reference Figure 5 The second cavity 32 includes a cavity 321 and an insertion port 322 connecting both ends of the cavity 321. The insertion port 322 extends through the side wall of the lower mold 3 and is used for inserting the end of the semi-ring 11. After the semi-ring 1 in the first cavity 31 is cast, it is placed on the upper side of the lower mold 3, and both ends of the semi-ring 1 are inserted into the insertion port 322 from top to bottom. Then, after the other semi-ring in the second cavity 32 is cast, it forms a complete ring together with the semi-ring 1.

[0053] Reference Figure 5A support base 4 is provided on one side of the lower mold 3, and a support groove 41 is provided on the upper end of the support base 4 for the middle part of the semi-ring 11 to be inserted. During casting, the support base 4 can support the semi-ring 1 to ensure that the ring is formed smoothly.

[0054] Reference Figure 5 , Figure 6 To facilitate demolding of the semi-ring 1, core pullers 7 are provided at both ends of the first cavity 31. The core pullers 7 fit the shape of the connecting part 12. Both ends of the second cavity 32 are connected to the sliding grooves 34 for the core pullers 7 to slide. During molding, the core pullers 7 can slide into the second cavity 32 along the sliding grooves 34; during demolding, the core pullers 7 can slide away from the second cavity 32 along the sliding grooves 34, so that a gap is formed between the semi-ring 1 and the inner wall of the first cavity 31. Using this as the point of force application, the semi-ring 1 can be easily removed.

[0055] Reference Figure 4 , Figure 5 A horizontal bar 5 is fixedly connected to the side of the support base 4 near the lower mold 3. Inserts 6 are fixedly connected to both ends of the horizontal bar 5, forming a U-shape with the two inserts 6 and the horizontal bar 5. The lower mold 3 is provided with slots 33 for inserting the inserts 6. The two slots 33 are located on both sides of the first cavity 31 and communicate with the slide groove 34. The inserts 6 can slide along the slots 33, allowing the support base 4 to move closer to or away from the lower mold 3. The sliding direction of the core pull 7 is perpendicular to the sliding direction of the inserts 6. A through groove 61 is provided on the upper side of the inserts 6 for the core pull 7 to be inserted into. When the support base 4 is in the position supporting the semi-ring 1, the end of the insert 6 away from the horizontal bar 5 abuts against the side wall of the core pull 7. At this time, the core pull 7 is limited by the inserts 6 and cannot move, thus facilitating the forming of the semi-ring 1. When the support base 4 moves close to the lower mold 3 until the insert 6 abuts against the inner wall of the slot 33 away from the horizontal bar 5, the through groove 61 is directly opposite the core pull 7. At this time, the core pull 7 can be inserted into the through groove 61 to facilitate demolding.

[0056] Reference Figure 5 , Figure 6 The inner wall of the through groove 61 away from the horizontal bar 5 is provided with a third inclined surface 62, and the side of the core pull 7 away from the first cavity 31 is provided with a fourth inclined surface 71 that cooperates with the third inclined surface 62. A tension spring 8 is fixedly connected between the inner wall of the slide groove 34 away from the first cavity 31 and the core pull 7. The tension spring 8 is located on the upper side of the insert 6 and applies tension to the core pull 7. When the insert 6 abuts against the inner wall of the slot 33 away from the horizontal bar 5, the tension spring 8 pulls the core pull 7 into the through groove 61, and at this time the third inclined surface 62 and the fourth inclined surface 71 are in contact. After demolding, the support base 4 is moved away from the lower mold 3, and the third inclined surface 62 applies a pressing force to the fourth inclined surface 71, which can drive the core pull 7 to overcome the force of the tension spring 8 and move into the first cavity 31, so as to facilitate the next hot pressing molding.

[0057] Reference Figure 5The support base 4 is threadedly connected to a screw 9, which is parallel to the insert 6. One end of the screw 9 is rotatably connected to the lower mold 3, and the other end is fixedly connected to a handwheel 10. Turning the handwheel 10 can move the support base 4 closer to or further away from the lower mold 3, which is more labor-saving.

[0058] The operating principle of the molding die is as follows:

[0059] Semi-ring 1 forming: The raw material is placed in the first cavity 31. After the upper mold 2 and the lower mold 3 are closed, the semi-ring 1 is formed and demolded after cooling.

[0060] Ring forming: Insert the middle part of the semi-ring 1 into the support groove 41 and insert both ends of the semi-ring 1 into the insertion port 322. Then place the raw material into the first cavity 31 and the second cavity 32. After closing the mold, hot press to form a ring body and a new semi-ring 1. Then separate the mold, turn the handwheel 10 to drive the screw 9 to rotate, so that the support seat 4 moves closer to the lower mold 3. The core puller 7 moves away from the first cavity 31 under the action of the tension spring 8. Then take out the semi-ring 1 and the ring body. Finally, turn the handwheel 10 to reset the support seat 4 and move the core puller 7 back to the first cavity 31. Repeat this step.

[0061] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A manufacturing process for an ultra-high pressure equalizing ring, characterized in that, Includes the following steps: S1 One-time molding: The raw material is placed in the first cavity (31) of the molding mold and hot-pressed. After demolding, a semi-ring part (1) is obtained. S2 Secondary molding: Place both ends of the semi-ring (1) into the second cavity (32) of the molding mold, then place the raw material into the second cavity (32) of the molding mold, perform hot pressing molding, and obtain the ring body after demolding; S3 Surface Polishing: Polishing the surface of the ring; S4 Assembly and Welding: The ring body, which has been polished by S3, is welded and fixed to the connector to obtain the ultra-high pressure equalizing ring; The semi-ring component (1) includes a semi-ring body (11) and a connecting part (12) connected to both ends of the semi-ring body (11). One side of the connecting part (12) is configured as an arc-shaped surface (121), and the other side is configured as a first inclined surface (122), a plane (123), and a second inclined surface (124) in sequence along the direction away from the semi-ring body (11). The arc-shaped surface (121) is connected to the surface of the semi-ring body (11), and the first inclined surface (122) and the second inclined surface (124) are both set away from the arc-shaped surface (121). The molding die includes an upper die (2) and a lower die (3). The first cavity (31) and the second cavity (32) are both located on the upper side of the lower die (3). The upper die (2) is connected to a first core (21) inserted into the first cavity (31) and a second core (22) inserted into the second cavity (32). The first cavity (31) and the second cavity (32) have the same arc orientation. The second cavity (32) includes a cavity (321) and an insertion port (322) connected to both ends of the cavity (321). The insertion port (322) extends through to the side wall of the lower die (3) and is used for inserting the end of the semi-ring (11).

2. The manufacturing process of the ultra-high pressure equalizing ring according to claim 1, characterized in that: In the S1 one-time molding and S2 two-time molding, the raw materials include the following components by weight: 85-90 parts aluminum alloy, 3-8 parts graphite, 2-6 parts phenolic resin, and 1-3 parts nano titanium dioxide.

3. The manufacturing process of the ultra-high pressure equalizing ring according to claim 2, characterized in that: In the S1 one-time molding and S2 two-time molding, the pressure is 15-30MPa and the temperature is 180-220℃.

4. The manufacturing process of the ultra-high pressure equalizing ring according to claim 1, characterized in that: A support base (4) is provided on one side of the lower mold (3), and a support groove (41) is provided at the upper end of the support base (4) for the middle part of the semi-ring body (11) to be inserted.

5. The manufacturing process of the ultra-high pressure equalizing ring according to claim 4, characterized in that: The support base (4) is connected to a horizontal bar (5) on the side near the lower mold (3). Both ends of the horizontal bar (5) are connected to inserts (6). The lower mold (3) is provided with slots (33) for inserts (6) to be inserted. The two slots (33) are located on both sides of the first cavity (31). Both ends of the first cavity (31) are provided with core pullers (7) that fit with the connecting part (12). The lower mold (3) is provided with a sliding groove (34) for the core pullers (7) to slide. The sliding groove (34) communicates with the slots (33). The inserts (6) abut against the side wall of the core pullers (7).

6. The manufacturing process of the ultra-high pressure equalizing ring according to claim 5, characterized in that: The insert (6) has a through groove (61) on its upper side for the core puller (7) to be inserted into. The inner wall of the through groove (61) away from the crossbar (5) has a third inclined surface (62). The core puller (7) has a fourth inclined surface (71) that cooperates with the third inclined surface (62). The inner wall of the sliding groove (34) away from the first cavity (31) is connected to the core puller (7) by a tension spring (8). The tension spring (8) is located on the upper side of the insert (6).

7. The manufacturing process of the ultra-high pressure equalizing ring according to claim 6, characterized in that: The support base (4) is threadedly connected to a screw (9), which is rotatably connected to the lower mold (3). A handwheel (10) is connected to the end of the screw (9) away from the lower mold (3).

8. The manufacturing process of the ultra-high pressure equalizing ring according to claim 6, characterized in that: When the insert (6) abuts against the inner wall of the slot (33) away from the crossbar (5), the third inclined surface (62) contacts the fourth inclined surface (71).

Images