Isostatic pressing tool and method for graphite material of water-lubricated bearing of nuclear power main pump

Abstract

The invention provides a nuclear power main pump water lubricated bearing graphite material isostatic pressing forming tool and method. The tool comprises a first assembling part and a second assembling part, and a first rotating part is arranged at the bottom of the first assembling part; the bottom of the second assembling part is provided with a second rotating part which is in running fit with the first rotating part, and the first assembling part and the second assembling part have a test state and an open state; in a test state, the second assembly part rotates towards the first assembly part, and the first assembly part and the second assembly part enclose to form a placing cavity for placing a test piece; in the opening state, the second assembling piece is opened in the direction deviating from the first assembling piece; and a plurality of through holes are formed in the peripheral walls of the first assembly part and the second assembly part, so that the placement cavity is communicated with the outside. According to the graphite material isostatic pressing tool for the water lubricated bearing of the nuclear power main pump, a test piece can obtain more uniform static pressure, so that the isostatic pressing effect and the isotropic index of the test piece are improved.

Description

Technical Field

[0001] The invention relates to the technical field of tooling, and in particular to an isostatic pressing tooling and a forming method for a graphite material of a water-lubricated bearing of a nuclear power main pump. Background Art

[0002] In order to solve the problems of large-scale product forming and uneven force in the localization development of graphite for shielded motor bearings of CAP nuclear main pumps, the existing pressing and forming equipment cannot meet the processing of large-size products, and the isotropy of the products is poor. For example, the static pressure obtained by the products is uneven, that is, the existing technical tooling cannot meet the relevant technical requirements.

[0003] Based on this, the inventor of the present application proposes an isostatic pressing tooling and forming method for graphite material of a water-lubricated bearing of a nuclear power main pump, in order to solve the above-mentioned technical problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the tooling cannot meet the isostatic pressing requirements of the products, and to provide a tooling and a method for isostatic pressing of graphite materials for water-lubricated bearings of nuclear power main pumps.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] The present invention provides a tool for isostatic pressing of graphite material for water-lubricated bearings of nuclear power main pumps, which is characterized by comprising:

[0007] A first assembly part, with a first rotating part at the bottom;

[0008] A second assembling piece, the bottom of which is provided with a second rotating piece rotatably matched with the first rotating piece, the first assembling piece and the second assembling piece having a test state and an open state;

[0009] In the test state, the second assembly piece rotates toward the first assembly piece, and the first assembly piece and the second assembly piece enclose to form a placement cavity for placing the test piece;

[0010] In the open state, the second assembly piece is opened in a direction away from the first assembly piece; wherein,

[0011] A plurality of through holes are provided on the outer peripheral walls of the first assembling piece and the second assembling piece to connect the placement cavity with the outside.

[0012] According to one embodiment of the present invention, the first assembly piece includes a first bottom plate, a first peripheral side plate and a first top plate;

[0013] The first rotating member is installed on the first bottom plate, and the first bottom plate, the first peripheral side plate and the first top plate are all provided with a plurality of the through holes;

[0014] The second assembly piece includes a second bottom plate, a second peripheral side plate and a second top plate;

[0015] The second rotating member is installed on the second bottom plate, and the second bottom plate, the second peripheral side plate and the second top plate are all provided with a plurality of through holes.

[0016] According to one embodiment of the present invention, a first inner arc plate is provided on the first bottom plate, and a second inner arc plate is provided on the second bottom plate;

[0017] When the first assembly piece and the second assembly piece are in a testing state, the first inner arc plate and the second inner arc plate are assembled to form a protection cavity.

[0018] According to one embodiment of the present invention, both the first inner arc plate and the second inner arc plate are semicircular;

[0019] A buffer chamber is formed between the outer sides of the first inner arc plate and the second inner arc plate and the first peripheral side plate and the second peripheral side plate.

[0020] According to an embodiment of the present invention, a plurality of through holes are formed on the first inner arc plate and the second inner arc plate.

[0021] According to one embodiment of the present invention, the axial direction of the through holes opened on the first inner arc plate and the second inner arc plate is not coaxial with the axial direction of the through holes opened on the first circumferential side plate and the second circumferential side plate.

[0022] According to an embodiment of the present invention, both the first top plate and the second top plate are provided with lifting rings, and when the first assembly piece and the second assembly piece are in the test state, the two lifting rings are close to each other and connected by a threaded connector.

[0023] According to an embodiment of the present invention, both the first peripheral side plate and the second peripheral side plate are semicircular arc-shaped.

[0024] According to an embodiment of the present invention, the first rotating member and the second rotating member are hinge matching structures.

[0025] The present invention also provides a method for isostatic pressing of graphite material for water-lubricated bearings of nuclear power main pumps, which is implemented by using the above-mentioned tooling for isostatic pressing of graphite material for water-lubricated bearings of nuclear power main pumps, and is characterized in that the molding method comprises:

[0026] Step 1, grinding the powder according to the process requirements, and loading the powder into a cardboard mold, packaging it with a composite film and vacuuming it to form a test piece;

[0027] Step 2, placing the test piece in a protective cavity;

[0028] Step 3: Use a crane to lift the test piece and the tooling together into the isostatic press for pressing.

[0029] The positive and progressive effects of the present invention are:

[0030] The isostatic pressing tooling of the graphite material of the water-lubricated bearing of the nuclear power main pump of the present invention adopts a first assembly part and a second assembly part which are assembled with each other. Thus, when placing the test piece, the second assembly part can be opened, and the placement of the test piece is more convenient. After the placement is completed, the first assembly part in the opened state can be adjusted to the test state, and then the tooling and the test piece can be placed in a static press together for isostatic pressing treatment.

[0031] Through holes are provided on the outer peripheries of the first assembly piece and the second assembly piece, so that the test piece can obtain a more uniform static pressure, thereby improving the isostatic pressure effect and isotropic index of the test piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0033] Figure 1 It is a schematic diagram of the test state of the isostatic pressing tooling of the graphite material for the water-lubricated bearing of the nuclear power main pump of the present invention;

[0034] Figure 2 for Figure 1 An interior view of

[0035] Figure 3 It is a simplified structural diagram of the isostatic pressing tooling of graphite material for water-lubricated bearing of nuclear power main pump in the open state of the present invention;

[0036] Figure 4 The present invention is a flow chart of the isostatic pressing method of the graphite material for the water-lubricated bearing of the nuclear power main pump.

[0037] 1. First assembly part; 11. First rotating part; 12. First bottom plate; 13. First peripheral side plate; 14. First top plate; 15. First inner arc plate; 16. Lifting ring;

[0038] 2. Second assembly part; 21. Second rotating part; 22. Placement cavity; 23. Second bottom plate; 24. Second peripheral side plate; 25. Second top plate; 26. Second inner arc plate; 27. Protection cavity; 28. Buffer cavity;

[0039] 3. Through hole. DETAILED DESCRIPTION

[0040] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0041] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0043] Please refer to Figures 1 to 3 The present invention proposes an isostatic pressing tooling for graphite material of a water-lubricated bearing of a nuclear power main pump, comprising a first assembly piece 1 and a second assembly piece 2, wherein a first rotating piece 11 is provided at the bottom of the first assembly piece 1; a second rotating piece 21 rotatably matched with the first rotating piece 11 is provided at the bottom of the second assembly piece 2, and the first assembly piece 1 and the second assembly piece 2 have a test state and an open state; in the test state, the second assembly piece 2 rotates toward the first assembly piece 1, and the first assembly piece 1 and the second assembly piece 2 enclose a placement cavity 22 for placing the test piece; in the open state, the second assembly piece 2 opens in a direction away from the first assembly piece 1; wherein a plurality of through holes 3 are provided on the outer peripheral walls of the first assembly piece 1 and the second assembly piece 2 to connect the placement cavity 22 with the outside.

[0044] It can be seen that the isostatic pressing process is to place the processed product through prefabrication, that is, the composite film and the cardboard mold are placed together in the placement cavity 22 to form a test piece, and then the test piece 4 is immersed in a closed container filled with liquid, and equal pressure is applied to each surface of the test piece to reduce the distance between molecules and increase the density without changing the appearance, thereby improving the physical properties of the product.

[0045] In the existing technology, there are problems such as large-scale product forming and uneven force in the localization research and development of graphite for shielded motor bearings of CAP nuclear main pumps.

[0046] Based on this, the present invention proposes the above-mentioned isostatic pressing tooling for the water-lubricated bearing graphite material of the nuclear power main pump, which is used to ensure the smooth forming of the product and obtain uniform static pressure, thereby improving the isostatic pressing effect and isotropy index of the product.

[0047] Please refer to Figures 1 to 3 The tooling of the present invention is assembled by a first assembly piece 1 and a second assembly piece 2, and has a test state and an open state. Figure 1 In the test state, the placement cavity 22 is a relatively closed space. At this time, the first assembly part 1 and the second assembly part 2 are assembled together to form the placement cavity 22. The test piece has been placed in the placement cavity 22. The tooling and the test piece can be carried into the isostatic pressing for isostatic pressing treatment.

[0048] Reference Figure 3 In the open state, the top of the placement cavity 22 is open, and the test piece can be placed in the placement cavity 22 from the top of the opened placement cavity 22. After the placement is completed, the second assembly piece 2 can be transferred to the first assembly piece 1 and reach the test state.

[0049] At the same time, a plurality of through holes 3 are provided on the outer peripheral walls of the first assembly piece 1 and the second assembly piece 2, so that during the test, the test piece is conducive to obtaining a more uniform static pressure, and the resulting product has a better static pressure effect and can also meet the isotropic index.

[0050] In one embodiment, the first assembly part 1 includes a first bottom plate 12 , a first peripheral side plate 13 and a first top plate 14 ; the first rotating member 11 is installed on the first bottom plate 12 , and a plurality of through holes 3 are formed on the first bottom plate 12 , the first peripheral side plate 13 and the first top plate 14 .

[0051] The second assembly part 2 includes a second bottom plate 23 , a second peripheral side plate 24 and a second top plate 25 . The second rotating member 21 is mounted on the second bottom plate 23 . The second bottom plate 23 , the second peripheral side plate 24 and the second top plate 25 are all provided with a plurality of through holes 3 .

[0052] Specifically, the first peripheral side plate 13 and the second peripheral side plate 24 are semicircular, and the first assembly part 1 and the second assembly part 2 are cylindrical in the test state. The test piece is placed in the middle position of the cylindrical placement cavity 22. In this way, when conducting an isostatic pressure test, the pressure applied to each surface of the test piece is more uniform, so that the distance between molecules is reduced without changing the appearance, the density is increased, and the physical properties of the product are improved. The product obtained in this way has better isotropy and meets the relevant technical requirements for graphite materials for water-lubricated bearings of nuclear power main pumps.

[0053] Furthermore, a first inner arc plate 15 is provided on the first bottom plate 12 , and a second inner arc plate 26 is provided on the second bottom plate 23 ; when the first assembly part 1 and the second assembly part 2 are in the testing state, the first inner arc plate 15 and the second inner arc plate 26 are assembled to form a protective cavity 27 .

[0054] A protection cavity 27 is further provided in the placement cavity 22 to limit the position of the test piece, so as to prevent the test piece from moving randomly in the placement cavity 22 and affecting the isostatic pressing treatment effect.

[0055] Specifically, the first inner arc plate 15 and the second inner arc plate 26 are both semicircular; a buffer chamber 28 is formed between the outer sides of the first inner arc plate 15 and the second inner arc plate 26 and the first peripheral side plate 13 and the second peripheral side plate 24 .

[0056] The buffer chamber 28 is arranged outside the protection chamber 27 to prevent the external water flow from directly impacting the test piece. The buffer chamber 28 can slow down the flow rate of the water flow, thereby making the flow rate of the water entering the protection chamber 27 more uniform, so that the force on the surrounding side of the test piece is more uniform.

[0057] It should be noted that a plurality of through holes 3 are provided on the first inner arc plate 15 and the second inner arc plate 26. Moreover, the first inner arc plate 15 and the second inner arc plate 26 may also be rectangular, polygonal, etc., which is compatible with the shape of the test piece, and the circular arc shape is used as an example for description.

[0058] Furthermore, the axial direction of the through holes 3 formed in the first inner arc plate 15 and the second inner arc plate 26 is not coaxial with the axial direction of the through holes 3 formed in the first circumferential side plate 13 and the second circumferential side plate 24 .

[0059] That is, in order to prevent the external water flow from directly impacting the test piece, the external water flow can be buffered in the buffer chamber 28 to reduce the flow velocity, thereby improving the uniformity of the flow velocity entering the protection cavity 27 .

[0060] In one embodiment, the first top plate 14 and the second top plate 25 are both provided with a lifting ring 16 , and in the test state, the first assembly piece 1 and the second assembly piece 2 are close to each other and connected by a threaded connector.

[0061] It can be known that the threaded connector can be a bolt, a screw, etc., which is not limited here. In some other embodiments, the two lifting rings 16 can also be connected by other connection methods such as clamping, rope, magnetic attraction, etc., which are not limited here.

[0062] In one embodiment, the first rotating member 11 and the second rotating member 21 are hinge matching structures.

[0063] In some other implementations, other types of connection structures may also be used, which are not limited here.

[0064] In summary, the isostatic pressing tooling for the graphite material of the water-lubricated bearing of the nuclear power main pump of the present invention adopts the first assembly part 1 and the second assembly part 2 assembled with each other, so that when placing the test piece, the second assembly part 2 can be opened, and the placement of the test piece is more convenient. After the placement is completed, the first assembly part 1 in the opened state can be adjusted to the test state, and then the tooling and the test piece can be placed together in the static press for isostatic pressing. The first assembly part 1 and the second assembly part 2 are both provided with through holes 3 on the periphery, so that the test piece can obtain a more uniform static pressure, thereby improving the isostatic pressing effect and isotropy index of the test piece.

[0065] Please refer to Figure 4 The present invention also proposes a method for isostatic pressing of graphite material for water-lubricated bearings of nuclear power main pumps, which is implemented by using the above tooling for isostatic pressing of graphite material for water-lubricated bearings of nuclear power main pumps. The molding method includes:

[0066] S1. Grind the powder according to the process requirements, put the powder into a cardboard mold, package it with a composite film and vacuum it to form a test piece;

[0067] S2. Place the test piece in the protective cavity;

[0068] S3. Use a crane to lift the test piece and the tooling together into the isostatic press for pressing.

[0069] That is, the tooling is assembled first, then the powder is ground as required, and the powder is placed in a cardboard mold, and the cardboard mold is wrapped with a composite film around it, and then vacuumed to form a test piece.

[0070] Secondly, open the first assembly and the second assembly, then place the test piece on the protective cavity and tie it up. After tying, lift the tooling and the test piece together into the isostatic press, then seal the equipment, and perform pressurization-pressure maintenance-pressure reduction treatment, then open the can lid to discharge the material, and the pressing and molding is completed.

[0071] The product obtained by the molding method of the present invention has uniform static pressure, and can improve the isostatic pressing effect and isotropic index of the product.

[0072] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "connect", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0073] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0074] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0075] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0076] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A tool for isostatic pressing of graphite materials for water-lubricated bearings of nuclear power main pumps, characterized in that: include: A first assembly part, with a first rotating part provided at the bottom; A second assembling piece, the bottom of which is provided with a second rotating piece rotatably matched with the first rotating piece, the first assembling piece and the second assembling piece having a test state and an open state; In the test state, the second assembly piece rotates toward the first assembly piece, and the first assembly piece and the second assembly piece enclose to form a placement cavity for placing the test piece; In the open state, the second assembly piece is opened in a direction away from the first assembly piece; wherein, A plurality of through holes are provided on the outer peripheral walls of the first assembling piece and the second assembling piece to connect the placement cavity with the outside.

2. The isostatic pressing tooling for graphite material of water-lubricated bearing of nuclear power main pump according to claim 1 is characterized in that: The first assembly piece includes a first bottom plate, a first peripheral side plate and a first top plate; The first rotating member is installed on the first bottom plate, and the first bottom plate, the first peripheral side plate and the first top plate are all provided with a plurality of the through holes; The second assembly piece includes a second bottom plate, a second peripheral side plate and a second top plate; The second rotating member is installed on the second bottom plate, and the second bottom plate, the second peripheral side plate and the second top plate are all provided with a plurality of through holes.

3. The isostatic pressing tooling for graphite material of water-lubricated bearing of nuclear power main pump according to claim 2 is characterized in that: A first inner arc plate is provided on the first bottom plate, and a second inner arc plate is provided on the second bottom plate; When the first assembly piece and the second assembly piece are in a testing state, the first inner arc plate and the second inner arc plate are assembled to form a protection cavity.

4. The isostatic pressing tooling for graphite material of water-lubricated bearing of nuclear power main pump according to claim 3 is characterized in that: The first inner arc plate and the second inner arc plate are both semicircular; A buffer chamber is formed between the outer sides of the first inner arc plate and the second inner arc plate and the first peripheral side plate and the second peripheral side plate.

5. The isostatic pressing tooling for graphite material of water-lubricated bearing of nuclear power main pump according to claim 3 is characterized in that: The first inner arc plate and the second inner arc plate are provided with a plurality of through holes.

6. The isostatic pressing tooling for graphite material of water-lubricated bearing of nuclear power main pump according to claim 5 is characterized in that: The axial directions of the through holes formed on the first inner arc plate and the second inner arc plate are not coaxial with the axial directions of the through holes formed on the first peripheral side plate and the second peripheral side plate.

7. The isostatic pressing tooling for graphite material of water-lubricated bearing of nuclear power main pump according to claim 3 is characterized in that: The first top plate and the second top plate are both provided with lifting rings. When the first assembly piece and the second assembly piece are in the test state, the two lifting rings are close to each other and connected by a threaded connector.

8. The isostatic pressing tooling for graphite material of water-lubricated bearing of nuclear power main pump according to claim 3 is characterized in that: The first peripheral side plate and the second peripheral side plate are both semicircular arc-shaped.

9. The isostatic pressing tooling for graphite material of water-lubricated bearing of nuclear power main pump according to any one of claims 1 to 8, characterized in that: The first rotating member and the second rotating member are hinge matching structures.

10. A method for isostatic pressing of graphite material for water-lubricated bearings of nuclear power main pumps, which is implemented by using the isostatic pressing tooling for graphite material for water-lubricated bearings of nuclear power main pumps as described in any one of claims 1 to 9, characterized in that: The molding method comprises: Step 1, grinding the powder according to the process requirements, and loading the powder into a cardboard mold, packaging it with a composite film and vacuuming it to form a test piece; Step 2, placing the test piece in a protective cavity; Step 3: Use a crane to lift the test piece and the tooling together into the isostatic press for pressing.

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